WO2013125004A1 - 電流形インバータ装置、および電流形インバータ装置の制御方法 - Google Patents
電流形インバータ装置、および電流形インバータ装置の制御方法 Download PDFInfo
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- WO2013125004A1 WO2013125004A1 PCT/JP2012/054400 JP2012054400W WO2013125004A1 WO 2013125004 A1 WO2013125004 A1 WO 2013125004A1 JP 2012054400 W JP2012054400 W JP 2012054400W WO 2013125004 A1 WO2013125004 A1 WO 2013125004A1
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/08—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters
- H02M1/084—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters using a control circuit common to several phases of a multi-phase system
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/01—Resonant DC/DC converters
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
- H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/33569—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements
- H02M3/33571—Half-bridge at primary side of an isolation transformer
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
- H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/33569—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements
- H02M3/33573—Full-bridge at primary side of an isolation transformer
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/4815—Resonant converters
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
Definitions
- the present invention relates to a current source inverter device that supplies current to a load such as a plasma load, and a control method for the current source inverter device.
- the current source inverter device includes a direct current reactor connected to a direct current source, a conversion unit that converts direct current power from the direct current reactor into alternating current power, and a control unit that drives and controls the switching element of the conversion unit. Since it can be handled as a current source, it has a feature that it acts in the direction of suppressing the fluctuation of the impedance of the load such as a load short circuit. For example, in the case of a plasma load, it acts in the direction of maintaining the plasma.
- the current source inverter device can stably supply current to the load even when the load fluctuates as described above, the current source inverter device can supply power to the plasma load whose impedance varies depending on the situation. Is suitable.
- the current source inverter device supplies a constant current to the load, so that the current is excessive to the plasma load. Since supply is suppressed, damage to the plasma load can be reduced.
- FIG. 15 is a diagram for explaining a configuration example of a current source inverter device.
- the current source inverter device 100 includes a current source step-down chopper circuit 101, a three-phase inverter circuit 102, and a three-phase transformer 103.
- the current source step-down chopper circuit 101 steps down the direct current input from an AC source and a rectifier circuit (not shown) by chopper-controlling the switching element Q1, and smoothes the current with a direct current reactor LF1 and inputs it to the three-phase inverter circuit 102. To do.
- a chopper circuit that performs orthogonal transformation may use a current source step-up / step-down chopper circuit instead of the current source step-down chopper circuit 101 described above.
- the three-phase inverter circuit 102 performs commutation between the elements by controlling ignition and extinction of the switching elements Q R , Q S , Q T , Q X , Q Y , and Q Z at a predetermined timing. AC power is supplied to the phase transformer 103.
- the load current is detected to determine the energization period, the technology for controlling the switching element within this energization period, the current flowing through the switching element is detected, A technique for controlling a switching element based on a detected current is known (see Patent Document 1).
- FIG. 16 and 17 are diagrams for explaining switching loss at the time of commutation in the circuit operation of FIG.
- FIG. 16 shows a case where the commutation source and the commutation destination switching elements are commutated without overlapping.
- the switching element Q R Tenryumoto, the commutation destination switching element Q S is set to ON state by a gate pulse signal G R and G S, respectively (FIG. 16 (a), (b) ). Since the rise of the falling gate pulse signal G S of the gate pulse signal G R is consistent, between the switching elements commutation is performed without overlapping.
- the commutation source current I QR and voltage V QR flowing through the switching element Q R drain-source voltage of the switching element
- a resonant inverter is known as a soft switching inverter that reduces switching loss.
- a commutation diode and a resonance capacitor are connected in parallel to a switching element, and a resonance circuit is configured by the resonance capacitor, a resonance inductance, and a switching element connected to the resonance circuit.
- ZVS (zero voltage switching) and ZCS (zero current switching) of the switching element are realized by charging / discharging of the resonance capacitor by the resonance current of the resonance circuit and conduction of the commutation diode (for example, Patent Document 2).
- the resonance circuit is configured to connect a resonance capacitor in parallel to the switching element, there is a problem that the capacitance is increased by the capacitor.
- Patent Document 3 a configuration in which a resonance circuit is formed by an auxiliary circuit including auxiliary switching elements has been proposed.
- a resonant capacitor In the case of a resonant inverter, a resonant capacitor must be connected in parallel to the switching element, and a control circuit that forms a control signal for the switching element for the resonant circuit can be operated as a normal switching element. There is a problem that it is necessary to prepare other than the control circuit to be controlled.
- the present invention solves the above-described conventional problems and prevents switching loss of the switching element by a normal switching operation for commutation operation without requiring special control in the control of the switching element of the current source inverter. For the purpose.
- the present invention is sufficient for the fluctuation of the load current in the generation of the commutation overlap section in which both the commutation source switching element and the commutation destination switching element are turned on.
- a commutation overlap section in which the overlap time width (phase width) is set in advance is provided.
- “fixed” means that the time width (phase width) of the commutation overlap section is set regardless of the load current fluctuation.
- the setting of the commutation overlap section controls the drive timing of the switching element.
- the resonance circuit is controlled by driving timing control in the commutation overlap section of the switching element, and the switching loss during the commutation operation of the switching element is reduced by the resonance current of the resonance circuit.
- the current source inverter device and the inverter control of the present invention only the drive timing of the switching element at the time of commutation is changed, and the commutation overlapping section in which both the commutation source and the commutation destination switching elements are turned on is generated.
- the resonance current is supplied to the resonance circuit by controlling the switching element in the commutation overlap section. The switching loss is reduced by the resonance current.
- the switching element control for preventing the switching loss is performed in addition to the switching operation control normally performed for the commutation operation as in the conventional current source inverter device. Is unnecessary, and in addition to the control circuit for controlling the operation of the switching element performed in the normal commutation operation, the control circuit for preventing the switching loss is unnecessary.
- the present invention does not simply reduce the switching loss of the switching element by generating an overlapping section in which both the commutation source and the commutation destination switching elements are in the ON state, but controls the switching element having the overlapping section.
- To control the generation of resonance current of the resonance circuit, and the resonance current generated by this control makes the current and voltage of the switching element at the commutation zero during the commutation, thereby reducing the switching loss during the commutation operation. To do.
- the present invention includes an aspect of a current source inverter device and an aspect of a control method of the current source inverter device.
- the current source inverter device of the present invention includes a current source chopper unit that constitutes a DC source, a multi-phase inverter unit that converts the DC output of the current source chopper unit into multi-phase AC power by operation of a plurality of switching elements, A control unit that controls the chopper unit and the multiphase inverter unit, and a resonance circuit that supplies a resonance current to the switching element of the multiphase inverter unit are provided.
- the control unit controls the drive timing of the commutation destination and the commutation source switching element during commutation between the switching elements of the multiphase inverter unit. By controlling the drive timing of the switching element, an overlapping section in which both the commutation destination switching element and the commutation source switching element are turned on is generated, and the resonance current of the resonance circuit is controlled.
- the resonance current of the resonance circuit is supplied in the reverse bias direction to the switching element that is the commutation source, and is supplied in the forward bias direction to the commutation diode that is connected in reverse parallel to the switching element.
- the commutation source switching element is set to zero current and zero voltage in the overlap section, and the commutation source switching element is switched from the on state to the off state. Flow operation at zero current and zero voltage.
- the current source inverter device and control method of the present invention are not limited to a three-phase inverter that converts DC power into three-phase AC power, but a multi-phase inverter that converts DC power into any multi-phase AC power of two or more phases. Can be applied to.
- the resonance circuit of the present invention uses the output of the commutation destination switching element as the resonance current supply source, and in the overlapping section, the commutation destination switching element is turned on before the commutation source switching element is turned off. Thus, a forward current flowing through the switching element at the commutation destination is introduced into the resonant circuit to generate a resonant current.
- the resonance circuit of the present invention includes the same number of current supply terminals as the number of phases of AC power converted by the multiphase inverter unit. Each current supply terminal is connected to each connection terminal of the switching element which opposes in the bridge structure of the switching element which forms a multiphase inverter part.
- the resonance current introduced into the commutation source switching element is in the opposite direction to the forward current flowing through the commutation source switching element, the forward current is canceled out and the current flowing through the commutation source switching element is zero current.
- the resonance current flows through the transfer diode, so that the voltage of the switching element that is the commutation source becomes zero voltage.
- the zero current state and the zero voltage state of the switching element of the commutation source are continued in the overlapping section, and the switching from the on state to the off state of the switching element of the commutation source is performed in the zero current state and the zero voltage state.
- ZCS and commutation by ZCS are performed.
- the circuit configuration of the resonance circuit of the present invention can be configured, for example, such that an LC series circuit is provided between each terminal formed by the current supply end.
- the LC series circuit generates a resonance current by inputting the forward current of the switching element at the commutation destination during commutation between the switching elements of the multi-phase inverter unit, and generates the resonance current of the switching element of the commutation source. Supply in reverse bias direction.
- the resonance circuit is configured so that the resonance current does not flow to the other switching elements that are turned on next. It is assumed that the reactance L and capacitance C of the LC series circuit satisfy the condition of (L ⁇ C) 1/2 > ⁇ / n. When the multiphase inverter unit is a three-phase inverter circuit, the condition that the reactance L and the capacitance C of the LC series circuit should satisfy (L ⁇ C) 1/2 > ⁇ / 3.
- the phase component ⁇ t in the overlapping section satisfies ⁇ / 2n> ⁇ t as a condition for preventing a short circuit between the switching elements.
- the phase ⁇ t of the overlapping section is ⁇ / 2n> ⁇ t, it is possible to prevent a short circuit between the two switching elements facing each other between the upper and lower sides of the DC power in the inverter bridge configuration.
- the condition to be satisfied by the phase component ⁇ t of the overlapping section is ⁇ / 6> ⁇ t.
- the forward current flowing in the commutation source switching element in the overlapping section can be made zero.
- the maximum peak value of the resonance current of the resonance circuit is larger than the phase current value of each phase of the multiphase inverter part.
- the control method of the current source inverter device of the present invention is a control method of the current source inverter device that converts the DC output of the current source chopper unit into multiphase AC power by the operation of a plurality of switching elements of the multiphase inverter unit. is there.
- At the time of commutation between the switching elements of the multiphase inverter unit by controlling the drive timing of the commutation destination and the commutation source switching element, both the commutation destination switching element and the commutation source switching element are turned on. The generation of the overlapping section and the resonance current are controlled.
- the resonance current is supplied to the commutation source switching element in the reverse bias direction, and the commutation diode connected in reverse parallel to the switching element is supplied in the forward bias direction.
- the commutation source switching element is set to zero current and zero voltage in the overlapping section, and the commutation operation at the time when the commutation source switching element switches from the on state to the off state is performed with zero current and zero voltage.
- the multi-phase inverter unit includes a bridge configuration of switching elements and a resonance circuit connected between connection terminals of the switching elements facing each other in the bridge configuration. At the time of commutation between switching elements, a current to the switching element at the commutation destination is introduced into the resonance circuit to generate a resonance current, and the resonance current generated in the overlapping section is applied to the switching element at the commutation source. Supply in the reverse bias direction of the switching element.
- the multiphase inverter unit is an inverter that converts DC power into n-phase AC power
- the condition that the phase component ⁇ t of the overlapping section satisfies as a condition for preventing a short circuit between the switching elements is ⁇ / 2n> ⁇ t.
- the multiphase inverter section is a three-phase inverter circuit
- the condition that the phase component ⁇ t of the overlapping section satisfies is ⁇ / 6> ⁇ t.
- condition for reducing the forward current flowing through the switching element of the transfer source to zero in the overlapping section is sin ( ⁇ t)> (the maximum peak value of the phase current / resonant current of the multiphase inverter unit).
- the forward current flowing in the commutation source switching element in the overlapping section can be made zero.
- the maximum peak value of the resonance current of the resonance circuit is larger than the phase current value of each phase of the multiphase inverter part.
- the control of the switching element of the current source inverter is usually performed for the commutation operation without requiring special control. Switching loss can prevent switching loss.
- the current source inverter device 1 of the present invention shown in FIG. 1 is input from a rectifying unit 10 that rectifies AC power of an AC power supply 2, a snubber unit 20 that forms a protection circuit that suppresses transiently generated high voltage, and a rectifying unit 10.
- a current-type step-down chopper unit 30 that converts the DC power voltage into a predetermined voltage and outputs a DC current
- a multi-phase inverter unit 40 that converts the DC output of the current-type step-down chopper unit 30 into a multi-phase AC output
- a multiphase transformer 50 that converts the AC output of the inverter 40 into a predetermined voltage
- a multiphase rectifier 60 that converts the AC of the multiphase transformer 50 into DC.
- a current-type step-up / step-down chopper unit may be used instead of the current-type step-down chopper unit 30 as a chopper unit that performs orthogonal transformation.
- the switching element Q 1 is, steps down by chopper controlling the DC voltage rectified by the rectifier unit 10.
- the direct current reactor L F1 smoothes the chopper-controlled direct current and inputs it to the multiphase inverter unit 40.
- the control circuit 80 a chopper current of the current-step-down chopper unit 30, and inputs a detection value of the output voltage of the current source inverter device 1, the chopper control of the switching element Q 1 so that a predetermined current and a predetermined output voltage To do.
- the current source inverter device 1 of the present invention shown in FIG. 2 is an example in which the current source step-down chopper unit 30 is another configuration example.
- the current source step-down chopper unit 30 shown in FIG. 2 has a configuration in which an output capacitor CF1 is connected in parallel to the output end.
- an output capacitor that is not provided in a normal current source step-down chopper is provided.
- the output capacitor C F1 By configuring the output capacitor C F1 to be connected to the output terminal of the current source step-down chopper unit 30, a surge voltage generated when performing a commutation operation between the switching elements of the multiphase inverter unit 40, and each switching element The switching element can be protected by absorbing the energy of the inductance connected in series.
- the value of the output capacitor C F1 is set to such an extent that the current delay does not affect the commutation of the inverter operation due to the time constant due to the output capacitor and the wiring inductance.
- the multi-phase inverter unit 40 includes a multi-phase inverter circuit configured by bridge-connecting switching elements corresponding to the number of phases.
- the three-phase inverter circuit is composed of six switching elements.
- the switching element for example, a semiconductor switching element such as an IGBT or a MOSFET can be used.
- Each switching element of the multiphase inverter circuit performs a switching operation based on the control signal of the switching control unit 81, converts DC power into AC power, and outputs the AC power.
- the multi-phase inverter unit 40 includes a resonance circuit 70, and introduces the resonance current generated by the resonance circuit 70 into a switching element in a commutation state of the multi-phase inverter circuit.
- the commutation of the switching element is performed with zero current and zero voltage. Do in state.
- the resonance circuit 70 of the present invention generates a resonance current in synchronization with the commutation operation of each switching element of the multiphase inverter circuit, introduces the resonance current into the commutation source switching element, and the commutation source switching element. Are commutated in a state of ZCS (zero current switching) and ZVS (zero voltage switching).
- the AC output of the multi-phase inverter unit 40 can obtain a high frequency output by increasing the switching frequency of the switching element.
- the current source inverter device supplies a high frequency output of, for example, 200 kHz to the load unit.
- the multiphase inverter circuit performs a switching operation of the switching element at a high frequency. As described above, when the switching element is switched at a high frequency, the AC output includes a high frequency ripple component.
- the polyphase rectification unit 60 is provided with a DC filter circuit in the output unit as an example of a configuration that removes the high-frequency ripple component included in the AC output of the polyphase inverter unit 40 in the same manner as an ordinary polyphase rectification circuit.
- DC filter circuit can be configured by the output reactor L FO connected to the output capacitor C FO in parallel connected in series to the output terminal.
- the current source inverter device 1 outputs the DC output of the multiphase rectification unit 60 via the wiring inductance L 0 provided in the wiring without the need for the above-described series filter circuit, and plasma that becomes a plasma load with the current source inverter device 1
- the generator 4 can be connected to the output cable 3, and the parasitic impedance of the current source inverter device can be used as a configuration for removing the high-frequency ripple component.
- the inductance of the wiring impedance 90 between the multiphase rectifier 60 and the output terminal, the inductance LFO included in the output cable connected between the current source inverter device 1 and the load, or the plasma load A filter circuit that removes the high frequency component similar to that of the series filter circuit is constituted by the electrode capacitance C 0 of the plasma generator 4 to reduce the high frequency ripple component.
- the load can be regarded as short-circuited, and the series filter circuit provided on the current source inverter device side from the output capacitor C FO arc energy Pc is supplied.
- arc energy Pc outputted from the output capacitor C FO can be expressed by the following equation (1).
- Pc 1/2 ⁇ C FO ⁇ V O 2 + 1/2 ⁇ (L FO + L O) ⁇ I O 2 ...
- the arc energy Pc of the plasma generator 4 is preferably 1 mJ or less per 1 kW of output. This is because the inductances L FO and L O usually show a small value, and the energy (L FO + L O ) ⁇ I O 2 of the inductances L FO and L O can be ignored for 1 mJ / kW. Note that 1 mJ / kW represents energy in mJ per 1 kW output, and the energy for 100 kW output is 100 mJ. Therefore, when the arc energy Pc of the plasma generator 4 is less than 1mJ, the output capacitor C FO value, by selecting a value or values of C FO obtained as 1mJ the Pc of the formula (1), The arc energy Pc is not affected.
- the current source inverter device instead of the series filter circuits, the configuration using the parasitic impedance of the electrode capacitance of the wiring impedance and output cables and a plasma generator, capacitance component corresponding to the output capacitor C FO is the arc energy Pc If it is large enough to be supplied, the high-frequency ripple component can be removed and the arc energy Pc can be supplied.
- the high-frequency ripple component has a characteristic that increases when the driving frequency of the multiphase inverter circuit is lowered. Therefore, by increasing the driving frequency of the polyphase inverter circuit, the need for output capacitors C FO and output reactor L FO can be reduced. Further, by increasing the drive frequency of the multiphase inverter circuit, it is possible to suppress the energy held in the current source inverter device 1 inside.
- FIG. 3 is a schematic configuration diagram and operation diagram of the current source inverter device
- FIG. 4 is a timing chart for explaining the commutation state of the switching element of the current source inverter device.
- the state of current flowing through the element and the wiring is shown by shading
- the conduction state is shown by dark display
- the non-conduction state is shown by light display.
- a connection point between the switching element Q R and the switching element Q x is connected as an R phase component of the three-phase transformer 51 via an inductance L m1
- a connection point between the switching element Q S and the switching element Q Y is an inductance L m2.
- connection, the connection point of the switching element Q R and the switching element Q x, the connection point of the switching elements Q S and the switching element Q Y, and the terminals of each resonant circuit connection point of the switching element Q ST and the switching element Q Z Then, a resonance current is supplied from the resonance circuit.
- the timing chart of FIG. 4 shows a rolling flow Sample images between the switching element Q R and the switching element Q S.
- the switching element Q R is the commutation source of the switching element, and a switching element Q S and commutation destination switching element.
- the commutation operation is controlled so that an overlapping section is generated in which both the commutation source switching element and the commutation destination switching element are turned on, and the commutation operation is synchronized with the commutation operation.
- the resonance current of the resonance circuit is controlled and supplied to the switching element of the commutation source.
- the gate pulse signal G S of the switching element Q S rises Timing the by before and falls gate pulse signal G R of the switching element Q R (FIG. 4 (a)), a gate pulse signal G R for the switching element Q R turned on (FIG. 4 (a))
- FIG. 4 A section in FIG. 4 is a switching element Q R is turned on, the current I QR (FIG. 4 (c)) flows to the switching element Q R, a current I QS of the switching element Q S (FIG. 4 (d)) Does not flow.
- FIG. 3A shows an operating state and a current state of the switching element in the A section.
- Current I QR of the switching element Q R (FIG. 4 (c)) is supplied to the three-phase transformer 51 as R-phase primary current I R (FIG. 4 (h)), the flow returns through the switching element Q Z.
- FIG. 3B shows an operating state and a current state of the switching element in the B section.
- a forward current of the switching element Q R is offset by the resonance current, 3 phase transformers 51, the primary current due to the part of the resonant current I R (FIG. 4 (h)) and the primary current I by the switching element Q S S (FIG. 4 (h)) is supplied, returns through the switching element Q Z.
- Section C the gate pulse signal G R falling by commutation source of the switching element Q R of is off, although the switching element Q R is off, the switching element Q S is turned on, each other Different on / off states.
- the switching element Q R is eliminated is offset by the resonance current stops flowing current I QR in the OFF state, the resonant current flows through the commutation diode D R subsequently.
- FIG. 3C shows an operating state and a current state of the switching element in the C section.
- Resonance current, offset the forward current of the switching element Q R is set to zero current and zero voltage by flowing through the commutation diode D R.
- the three-phase transformer 51, the primary current I S by the primary current I R and the switching element Q S by part of the resonant current is supplied, returns through the switching element Q Z (FIG. 4 (h)).
- the primary current I S of the primary current I R and S phases of the R phase flows as the primary current between the three-phase transformer 51 side.
- Current I QR flow as the section A, the primary current I R, Section B, the after commutated to the primary current I S from the primary current I R in C, and a current flows I QS as the primary current I S in the interval D.
- the primary current I R and the primary current I S flows both intervals during commutation, the primary current I R and the primary current I S to have the same current value, flows through half of the current when one of the primary current flows.
- Primary current I R and the primary current I S both flow section is a portion except a section switch to section D among the FIG 4 (h) In the section C is carried out.
- the primary current I R decreases towards the middle of the current, the primary current I S increases towards the middle of the current.
- the at switching part to section D the primary current I R decreases towards the middle of the current to zero current, the primary current I S from the middle of the current in the primary current It increases toward the total current.
- FIG. 3D shows the operating state and current state of the switching element in the D section.
- the resonance current stops, and the three-phase transformer 51 is supplied with the primary current I S by the switching element Q S and returns through the switching element Q Z.
- the resonance current of the resonance circuit is supplied in the reverse bias direction to the switching element of the commutation source in the overlapping section, and the forward bias direction is applied to the commutation diode connected in reverse parallel to the switching element.
- the commutation source switching element is set to zero current and zero voltage in the overlapping section, and the commutation operation at the time when the commutation source switching element switches from the on state to the off state is performed with zero current and zero voltage.
- FIG. 5 shows a configuration example of the inverter circuit and the resonance circuit of the present invention
- FIG. 6 shows a timing chart for explaining the driving of the inverter circuit switching element of the present invention
- FIG. 7 explains the resonance current of the resonance circuit of the present invention.
- FIG. 8 shows a diagram for explaining the resonance circuit of the present invention
- FIG. 9 shows a diagram for explaining the inverter control overlap section and the condition of the resonance circuit of the present invention
- FIG. 10 is a diagram for explaining the commutation state of the switching element of the inverter circuit of the present invention
- FIG. 11 to 14 are diagrams for explaining the operation of the inverter control of the present invention.
- the current state flowing through the element and the wiring is shown in shades
- the conduction state is shown in dark display
- the non-conduction state is shown in light display.
- the resonance circuit of the present invention includes an LC series circuit between each terminal formed by the current supply end of the resonance circuit.
- Each LC series circuit generates a resonance current by inputting a forward current from the switching element at the commutation destination during commutation between the switching elements of the inverter circuit, and the generated resonance current is reversed from the switching element at the commutation source. Supply in the bias direction.
- the inverter circuit 41 shown in FIG. 5 (a), six switching elements Q R, Q S, Q T , Q X, Q Y, will be a Q Z bridge-connected switching elements Q R and the switching element Q x Are connected in series, the switching element Q S and the switching element Q Y are connected in series, and the switching element Q T and the switching element Q z are connected in series.
- connection point R between the switching element Q R and the switching element Q x is connected as an R phase component of the three-phase transformer 51 via an inductance L m1
- a connection point S between the switching element Q S and the switching element Q Y is an inductance through L m @ 2 are connected as S-phase of the three-phase transformer 51
- a switching element Q T and the switching element Q Z connecting point T is connected as T-phase of the three-phase transformer 51 via an inductance L m3
- Resonant circuit 71 is provided with three sets of resonance circuit consisting of the series connection of a capacitor C L and a reactance L C, each end of the three sets of resonator circuit is connected between the three current supply end terminal.
- Each terminal of the current supply end includes a connection point R between the switching element Q R and the switching element Q x, a connection point S between the switching element Q S and the switching element Q Y , and a connection point T between the switching element Q ST and the switching element Q Z. Connected to.
- the resonance circuit 71 generates a resonance current by inputting a forward current of a switching element that is a commutation destination of two switching elements that perform a commutation operation. Further, the resonance circuit 71 supplies the generated resonance current in the reverse vice direction of the commutation source switching element of the two switching elements performing the commutation operation. For example, when performing commutation between the switching element Q R and the switching element Q S, the resonance circuit 71 generates a resonant current to enter the forward current of the switching element Q S is commutation destination supplies current the generated resonance current in the reverse bias direction of the switching element Q R is the commutation source.
- the resonance circuit 71 has shown the structure of (DELTA) form connection in Fig.5 (a), it is good also as a structure by the star connection shown in FIG.5 (b).
- the timing chart for explaining the driving of the switching elements of the inverter circuit of the present invention in FIG. 6 shows gate pulse signals for driving the switching elements Q R , Q S , Q T , Q X , Q Y , Q Z.
- FIG. 6 shows an example of a three-phase inverter, when one cycle of driving angular frequency omega I of the three-phase inverter and the phase fraction of 2 [pi, the section which is turned in each phase of the switching element (2 [pi / 3 ) Phase.
- one cycle is divided into a total of 12 sections with a phase of ⁇ / 6 as one section.
- a resonance current is generated in the resonance circuit by providing an overlapping section ⁇ t between two switching elements in a commutation relationship, and the generated resonance current is supplied to the commutation source switching element.
- the commutation source switching element is commutated by ZCS (zero current switching) and ZVS (zero voltage switching), thereby reducing the switching loss during commutation.
- Figure 7 shows the relationship between the overlap period ⁇ t and the resonance current I CL for R-phase primary current I R, 7 (a) shows a resonance current I CL and R-phase primary current I R, 7 ( b) shows a gate pulse signal G R for driving and controlling the switching element Q R, FIG. 7 (c) shows a gate pulse signal G S for driving and controlling the switching element Q S.
- FIG. 8 shows a configuration example of the resonance circuit.
- the resonance current I CL generated by the resonance circuit formed by connecting the capacitor C L and the reactor L C of the resonance circuit in series is converted into the equivalent capacitance C e and the equivalent reactor L e of the resonance circuit.
- I CL I max ⁇ sin ⁇ n t
- the maximum value I max of the resonance current and the angular frequency ⁇ n of the resonance circuit are expressed by the following equations (3) and (4), respectively.
- I max V RS / (L e / C e ) 1/2
- ⁇ n 1 / (L e ⁇ C e ) 1/2 (4)
- V RS , L e and C e are a voltage, an equivalent reactor, and an equivalent capacitance between the R terminal and the S terminal of the resonance circuit shown in FIG. 8 (b) is an equivalent circuit of the resonant circuit when commutated into S phase from R-phase, L e and C e for I CT current does not flow at this time T phase viewed from between R-S phases It can be handled as a synthetic impedance circuit.
- the equivalent reactor L e and the equivalent capacitance C e are expressed by the following equations (5) and (6).
- L e 2/3 ⁇ L C (5)
- C e 3/2 ⁇ C L (6)
- the current between the commutation diode D of the switching element Q is made conductive, thereby setting the drain-source voltage of the switching element to zero voltage and ZVS (zero voltage switching). Can do.
- the supply current to the commutating diode D supplies a primary current I R min to a three-phase transformer, the maximum peak value I max of the resonant current I CL represented by the formula (3), in each phase , I max> I R, I max> I S, to be in the range of I max> I T, selecting the capacitor C L and a reactor L C at the resonant circuit.
- the maximum range of the overlapping section ⁇ t is ⁇ corresponding to a half cycle of the resonance current.
- the resonance current is already attenuated to zero when the overlapping section ⁇ t ends and the switching element of the commutation source is turned off. For this reason, the commutation diode of the switching element that is the commutation source cannot be brought into conduction to obtain a zero voltage state.
- the overlap section ⁇ t is set within ⁇ for a half period of the resonance current.
- Figure 9 is a diagram for explaining the conditions for setting the capacitor C L and the reactor L C of overlapping sections ⁇ t and the resonant circuit.
- Figure 9 (a), (b) shows the timing of gate pulse signal of the switching element Q R and Q X in the connection relationship in the bridge configuration
- FIG. 9 (c) shows the a connection relationship in (d) of the bridge structure
- the timings of the gate pulse signals of the switching elements Q S and Q Y are shown.
- FIGS. 9G and 9H show the timings of the gate pulse signals of the switching elements Q T and Q Z which are connected in the bridge configuration.
- FIG. 9 (e) shows a resonance current I CL of the resonant circuit connected between the switching element Q R and the switching element Q S
- FIG. 9 (f) is the forward current I QR flowing through the switching element Q R Show.
- the conditions for performing the commutation operation and the switching operation of ZCS and ZVS are as described above.
- the maximum peak value I max of the resonance current I CL is in a range of I max > I R , I max > I S , and I max > I T in each phase.
- the maximum range of the overlapping section ⁇ t is ⁇ corresponding to a half period of the resonance current. There are conditions.
- each extension period is shorter than ⁇ / 6. It becomes.
- the switching element Q S As indicated by reference numeral B in FIG. 9, after the switching element Q S is turned on, the switching element Q X is turned on after ⁇ / 3 and the next resonance current starts to flow.
- the resonance current I CL generated when S is turned on needs to end within ⁇ / 3.
- ⁇ n is an angular frequency of the resonance circuit.
- FIG. 6 shows the commutation operation between the switching elements Q R and the switching element Q S of the operation mode 4, 5 and 6.
- the switching element Q R is the commutation source of the switching element, and a switching element Q S and commutation destination switching element.
- Current source inverter device controls the commutation operation so that the commutation source of the switching element Q R and commutation destination overlap interval switching element Q S are both turned on is generated, commutation destination switching by introducing the forward current that flows when the element Q S is turned on to the resonant circuit 71, in synchronization with the commutation operation to generate a resonance current in the resonance circuit, the generated resonant current commutation source It is supplied to the switching element Q R.
- Commutation source of the switching element Q R and commutation destination overlapping section and the switching element Q S are both turned on, the timing gate pulse signal G S (FIG. 10 (b)) rises of the switching element Q S, the switching element Q R of the gate pulse signal G R (FIG. 10 (a)) are those in which the up fall timing, the gate pulse signal G R (FIG. 10 (a)) to the switching element Q R oN state and An overlapping section is formed by temporally overlapping the gate pulse signal G S (FIG. 10B) that turns on the switching element Q S.
- the switching element Q S is turned on before the switching element Q R is switched from the ON state to the OFF state, the inside overlap period [theta] t (operation mode 5), the switching element Q R and the switching element Q S is a both turned on Become.
- the A section corresponds to the operation mode 4
- the B section corresponds to a part of the operation mode 5
- the C section corresponds to the remaining part of the operation mode 5
- the D section corresponds to the operation mode 6.
- FIG. 10 A section in FIG. 10 is a switching element Q R is in the ON state, the current I QR flows to the switching element Q R, a current I QS of the switching element Q S (FIG. 10 (c)) does not flow.
- FIG. 11 shows the operating state and current state of the switching element in section A.
- Current I QR of the switching element Q R is supplied to the three-phase transformer 51 as R-phase primary current I R, back through the switching element Q Z.
- a resonance current I CL is generated in the resonance circuit 71 by introducing the forward current I QS flowing through the switching element Q S in the ON state into the resonance circuit 71 (FIG. 10G).
- the resulting resonant current I CL is introduced into the reverse bias direction with respect to the commutation source of the switching element Q R.
- Introduced resonant current I CL since the switching element Q R is a forward current I QR opposite direction, it decreases by canceling the current I QR (FIG. 10 (c)).
- a circled symbol 1 in FIGS. 10C and 10G indicates a current component in a canceling relationship.
- FIG. 12 shows the operating state and current state of the switching element in section B.
- Current of the switching element Q S is introduced into the resonant circuit 71 through the terminal S, the resonance current I CL is generated by the resonance circuit comprising a series connection of a capacitor C L and the reactor L C.
- Part of the resonant current I CL is supplied to the three-phase transformer 51 as a primary current of the R-phase, and the remaining portion is supplied to the reverse bias direction to the switching element Q R of the commutation source.
- a forward current of the switching element Q R is offset by the resonance current, to a three-phase transformer 51, the primary current I S by the primary current I R and the switching element Q S by part of the resonant current is supplied, the switching element Return through Q Z.
- the drain-source voltage of the switching element Q R is held at zero voltage (FIG. 10 (f)).
- the overlap interval ends when the gate pulse signal G R falls commutation source of the switching element Q R.
- FIG. 13 shows the operating state and current state of the switching element in section C.
- Resonance current I LC is to offset the forward current of the switching element Q R is set to zero current and zero voltage by flowing through the commutation diode D R.
- the three-phase transformer 51, the primary current I S by the primary current I R and the switching element Q S by part of the resonant current is supplied, it returns through the switching element Q Z.
- the primary current I R of the R-phase, commutation occurs in the interval B, I R and I S becomes the same current in the section C, further commutation occurs at the end of the section from C, current I QR
- the voltage is switched to the voltage I QS (FIG. 10 (h)) and supplied to the three-phase transformer 51 without being cut off.
- FIG. 14 shows the operating state and current state of the switching element in section D. Resonance current I LC stops, the primary current I S by the switching element Q S is supplied to the 3-phase transformer 51, back through the switching element Q Z.
- the resonance current of the resonance circuit is supplied in the reverse bias direction to the switching element that is the commutation source in the overlapping section, and the forward bias direction is applied to the commutation diode that is connected in reverse parallel to the switching element.
- the commutation source switching element is set to zero current and zero voltage in the overlapping section, and the commutation operation at the time when the commutation source switching element switches from the on state to the off state is performed with zero current and zero voltage.
- the drive timing of the commutation destination and the commutation source switching element can be performed in a plurality of forms.
- a form in which the timing for switching the commutation destination switching element from the off state to the on state is advanced a form in which the timing for switching the commutation source switching element from the on state to the off state is delayed, and the commutation destination switching element in the off state
- the timing for switching from the ON state to the OFF state and the timing for switching the commutation source switching element from the ON state to the OFF state can be delayed.
- the current source inverter device of the present invention can be applied as a power source for supplying power to the plasma generator.
Abstract
Description
本願発明の電流形インバータ装置は、直流源を構成する電流形チョッパ部と、電流形チョッパ部の直流出力を複数のスイッチング素子の動作により多相の交流電力に変換する多相インバータ部と、電流形チョッパ部および多相インバータ部を制御する制御部と、多相インバータ部のスイッチング素子に共振電流を供給する共振回路を備える。
本願発明の電流形インバータ装置の制御方法は、電流形チョッパ部の直流出力を、多相インバータ部が有する複数のスイッチング素子の動作により多相の交流電力に変換する電流形インバータ装置の制御方法である。多相インバータ部のスイッチング素子間の転流時において、転流先と転流元のスイッチング素子の駆動タイミングを制御することによって、転流先のスイッチング素子と転流元のスイッチング素子が共にオン状態となる重なり区間の生成、および、共振電流を制御する。
はじめに、本発明の電流形インバータ装置の構成例について図1,図2を用いて説明する。
Pc=1/2×CFO×VO 2+1/2×(LFO+LO)×IO 2 …(1)
次に、本発明の電流形インバータ装置における転流動作例について図3,図4を用いて、3相インバータの例に基づいて説明する。
(A区間):
図4中のA区間はスイッチング素子QRがオン状態にあり、スイッチング素子QRに電流IQR(図4(c))が流れ、スイッチング素子QSの電流IQS(図4(d))は流れない。
ゲートパルス信号GSによってスイッチング素子QSがオン状態となり、スイッチング素子QSに電流IQS(図4(d))が流れ始める。このとき、スイッチング素子QSの電流IQSは、共振部70,インダクタンスLm1,インダクタンスLm2による時定数で増加するため、スイッチング素子QSのオン時点はZCS(零電流スイッチング)が行われる(図4(d))。
B区間の終了時点では、スイッチング素子QRの電流QR(図4(c))は共振電流(図4(g))で相殺されて零電流となり、共振電流の余剰分は、スイッチング素子QRに並列接続された転流ダイオードDRにダイオード電流IDR(図4(e))として流れ始める。図4(e)と図4(g)の丸付き符号2は対応関係にある電流分を示している。
共振電流が零となった時点で、スイッチング素子QRのドレイン・ソース間の電圧VQRには直流電圧分が印加される(図4(f))。
上記した電流IQRから電流IQSの切り替え動作によって、電流形降圧チョッパ部から3相変圧器51に一次電流が遮断されることなく供給される。
以下、ZCS(零電流スイッチング)およびZVS(零電圧スイッチング)の転流動作に必要な重なり区間θtについて説明する。
ICL=Imax×sinωnt …(2)
ここで、共振電流の最大値Imaxおよび共振回路の角周波数ωnはそれぞれ以下の式(3)、(4)で表される。
Imax=VRS/(Le/Ce)1/2 …(3)
ωn=1/(Le×Ce)1/2 …(4)
Le=2/3×LC …(5)
Ce=3/2×CL …(6)
共振回路の角周波数ωnは、式(4)~(6)で示されるように共振回路のコンデンサCLとリアクトルLCで定まり、共振回路に固有の角周波数である。
tP=π/2 ×1/ωn=π/2×(LC×CL)1/2 …(7)
(a)共振電流ICLの最大ピーク値Imaxは、各相において、Imax>IR、Imax>IS、Imax>ITの範囲である。
(b)重なり区間θtの最大範囲は共振電流の半周期分πである。
の条件がある。
図10中のA区間はスイッチング素子QRがオン状態にあり、スイッチング素子QRに電流IQRが流れ、スイッチング素子QSの電流IQS(図10(c))は流れない。
ゲートパルス信号GSによってスイッチング素子QSがオン状態となり、スイッチング素子QSに電流IQSが流れ始める。このとき、スイッチング素子QSの電流IQSはインダクタンスLm2やLCによる時定数で増加するため、スイッチング素子QSのオン時点は(ZCS)零電流スイッチング)が行われる(図10(d))。
スイッチング素子QRの電流IQRは零電流となる。共振電流の余剰分は、スイッチング素子QRに並列接続された転流ダイオードDRに流れる。図10(e)と図10(g)の丸付き符号2は対応関係にある電流分を示している。
共振電流が零となった時点で、スイッチング素子QRのドレイン・ソース間電圧VQRには直流電圧分が印加される(図10(f))。
2 交流電源
3 出力ケーブル
4 プラズマ発生装置
10 整流部
20 スナバー部
30 電流形降圧チョッパ部
40 多相インバータ部
41 インバータ回路
42 インバータ回路
50 多相変圧部
51 3相変圧器
60 多相整流部
70 共振回路
71 共振回路
72 共振回路
80 制御回路部
81 スイッチング制御部
90 配線インピーダンス
100 電流形インバータ装置
101 電流形降圧チョッパ回路
102 3相インバータ回路
103 3相変圧器
Claims (10)
- 直流源を構成する電流形チョッパ部と、前記電流形チョッパ部の直流出力を複数のスイッチング素子の動作により多相の交流電力に変換する多相インバータ部と、前記電流形チョッパ部および前記多相インバータ部を制御する制御部と、前記多相インバータ部のスイッチング素子に共振電流を供給する共振回路を備え、
前記制御部は、
前記多相インバータ部のスイッチング素子間の転流時において、
転流先と転流元のスイッチング素子の駆動タイミングを制御することによって、転流先のスイッチング素子と転流元のスイッチング素子が共にオン状態となる重なり区間の生成、および、前記共振回路の共振電流の制御を行い、
前記共振回路の共振電流は、前記重なり区間において、転流元のスイッチング素子に対して逆バイアス方向に供給し、および、当該スイッチング素子に逆並列接続された転流ダイオードに対して順バイアス方向に供給することによって、当該転流元のスイッチング素子を前記重なり区間において零電流および零電圧とし、
転流元のスイッチング素子がオン状態からオフ状態への切り替わる時点における転流動作を零電流および零電圧で行うことを特徴とする、電流形インバータ装置。 - 前記共振回路は、前記多相インバータ部が変換する交流電力の相数と同数の電流供給端子を備え、
前記各電流供給端子を、前記多相インバータ部を形成するスイッチング素子のブリッジ構成において相対するスイッチング素子の各接続端子に接続し、
前記多相インバータ部のスイッチング素子間の転流時において、転流元のスイッチング素子に対して当該スイッチング素子の逆バイアス方向に共振電流を供給することを特徴とする、請求項1に記載の電流形インバータ装置。 - 前記共振回路は、前記電流供給端が形成する各端子間にそれぞれLC直列回路を備え、
前記多相インバータ部のスイッチング素子間の転流時において、
前記LC直列回路は、転流先のスイッチング素子の順電流を入力して共振電流を生成し、当該共振電流を転流元のスイッチング素子の逆バイアス方向に供給することを特徴とする、請求項2に記載の電流形インバータ装置。 - 前記多相インバータ部は直流電力をn相の交流電力に変換するインバータであり、
前記共振回路は、前記共振電流が次にオン状態となる他のスイッチング素子に流れないための条件として、
前記共振回路を構成するLC直列回路のリアクタンスLおよびキャパシタンスCは、n相の多相インバータ部の駆動角周波数ωIに対して、(L×C)1/2<1/(n×ωI)であることを特徴とする、請求項3に記載の電流形インバータ装置。 - 前記多相インバータ部は直流電力をn相の交流電力に変換するインバータであり、
前記重なり区間の位相分θtは、
スイッチング素子間の短絡を防ぐための条件としてπ/2n>θtを満たし、
重なり区間内において転送元のスイッチング素子に流れる順方向電流を零に減少させるための条件としてsin(θt)>(多相インバータ部の相電流/共振電流の最大ピーク値)を満たすことを特徴とする、請求項1から4の何れか一つに記載の電流形インバータ装置。 - 前記共振回路の共振電流の最大ピーク値は、多相インバータ部の各相の相電流値よりも大であることを特徴とする、請求項1から4の何れか一つに記載の電流形インバータ装置。
- 電流形チョッパ部の直流出力を、多相インバータ部が有する複数のスイッチング素子の動作により多相の交流電力に変換する電流形インバータ装置の制御方法において
前記多相インバータ部のスイッチング素子間の転流時において、
転流先と転流元のスイッチング素子の駆動タイミングを制御することによって、転流先のスイッチング素子と転流元のスイッチング素子が共にオン状態となる重なり区間の生成、および、共振電流を制御し、
前記重なり区間において、前記共振電流を、転流元のスイッチング素子に対して逆バイアス方向に供給し、当該スイッチング素子に逆並列接続された転流ダイオードに対して順バイアス方向に供給することによって、当該転流元のスイッチング素子を前記重なり区間において零電流および零電圧とし、
転流元のスイッチング素子がオン状態からオフ状態への切り替わる時点における転流動作を零電流および零電圧で行うことを特徴とする、電流形インバータ装置の制御方法。 - 前記多相インバータ部はスイッチング素子のブリッジ構成と、当該ブリッジ構成において相対するスイッチング素子の接続端子間に接続した共振回路とを備え、
前記スイッチング素子間の転流時において、転流先のスイッチング素子への電流を前記共振回路に導入して共振電流を生成し、
前記重なり区間において、当該生成した共振電流を転流元のスイッチング素子に対して当該スイッチング素子の逆バイアス方向に供給することを特徴とする、請求項7に記載の電流形インバータ装置の制御方法。 - 前記多相インバータ部は直流電力をn相の交流電力に変換するインバータであり、
前記重なり区間の位相分θtは、
スイッチング素子間の短絡を防ぐための条件としてπ/2n>θtを満たし、
重なり区間内において転送元のスイッチング素子に流れる順方向電流を零に減少させるための条件としてsin(θt)>(多相インバータ部の相電流/共振電流の最大ピーク値)を満たすことを特徴とする、請求項7又は8に記載の電流形インバータ装置の制御方法。 - 前記共振回路の共振電流の最大ピーク値は、多相インバータ部の各相の相電流値よりも大であることを特徴とする、請求項7から9の何れか一つに記載の電流形インバータ装置の制御方法。
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