WO2023161669A1 - 電力変換方法及び電力変換装置 - Google Patents

電力変換方法及び電力変換装置 Download PDF

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Publication number
WO2023161669A1
WO2023161669A1 PCT/IB2022/000092 IB2022000092W WO2023161669A1 WO 2023161669 A1 WO2023161669 A1 WO 2023161669A1 IB 2022000092 W IB2022000092 W IB 2022000092W WO 2023161669 A1 WO2023161669 A1 WO 2023161669A1
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WO
WIPO (PCT)
Prior art keywords
power conversion
class
output
voltage
duty
Prior art date
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Ceased
Application number
PCT/IB2022/000092
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English (en)
French (fr)
Japanese (ja)
Inventor
貴之 猪狩
滋春 山上
ロビソンジョルジョ
克和 桑原
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Renault SAS
Nissan Motor Co Ltd
Original Assignee
Renault SAS
Nissan Motor Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Renault SAS, Nissan Motor Co Ltd filed Critical Renault SAS
Priority to JP2024502575A priority Critical patent/JP7825700B2/ja
Priority to CN202280092393.6A priority patent/CN119032500A/zh
Priority to EP22927605.0A priority patent/EP4485785A4/en
Priority to PCT/IB2022/000092 priority patent/WO2023161669A1/ja
Priority to US18/840,415 priority patent/US20250167660A1/en
Publication of WO2023161669A1 publication Critical patent/WO2023161669A1/ja
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • 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
    • H02M1/0048—Circuits or arrangements for reducing losses
    • H02M1/0054—Transistor switching losses
    • H02M1/0058—Transistor switching losses by employing soft switching techniques, i.e. commutation of transistors when applied voltage is zero or when current flow is zero
    • 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
    • H02M1/0067—Converter structures employing plural converter units, other than for parallel operation of the units on a single load
    • H02M1/007—Plural converter units in cascade
    • 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
    • H02M1/10—Arrangements incorporating converting means for enabling loads to be operated at will from different kinds of power supplies, e.g. from AC or DC
    • 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
    • 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
    • H02M3/02—Conversion of DC power input into DC power output without intermediate conversion into AC
    • H02M3/04—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters
    • H02M3/10—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M3/145—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M3/155—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
    • H02M3/156—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators
    • 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
    • H02M3/02—Conversion of DC power input into DC power output without intermediate conversion into AC
    • H02M3/04—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters
    • H02M3/10—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M3/145—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M3/155—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
    • H02M3/156—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators
    • H02M3/1566—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators with means for compensating against rapid load changes, e.g. with auxiliary current source, with dual mode control or with inductance variation
    • 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
    • H02M3/33507—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 with automatic control of the output voltage or current, e.g. flyback 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
    • H02M7/02—Conversion of AC power input into DC power output without possibility of reversal
    • H02M7/04—Conversion of AC power input into DC power output without possibility of reversal by static converters
    • 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 power conversion method and a power converter.
  • Patent Document 1 Conventionally, there is known an invention that operates a class E power conversion circuit with high efficiency over a wide input range (Patent Document 1).
  • the invention described in Patent Document 1 has a class E power conversion circuit by arranging voltage adjustment means for stabilizing the input voltage of the class E power conversion circuit between the class E power conversion circuit and the AC input voltage. It operates with high efficiency over a wide input range.
  • the present invention has been made in view of the above problems, and its object is to provide a power conversion method and a power conversion device that can operate with high efficiency without increasing the size.
  • a power conversion method sets the on-duty of a switch based on the output current or output power output from a class E power conversion circuit.
  • the power conversion device can be operated with high efficiency without increasing its size.
  • FIG. 1 is a configuration diagram of a power converter 100 according to the first embodiment of the present invention.
  • FIG. 2 is a graph showing the relationship between input voltage and switching frequency.
  • FIG. 3 is a graph showing the relationship between input voltage and switching frequency.
  • FIG. 4 is a configuration diagram of the power converter 100 according to the second embodiment of the present invention.
  • FIG. 5 is a configuration diagram of a power converter 100 according to a third embodiment of the present invention.
  • FIG. 6 is a map showing feasibility of zero voltage switching.
  • FIG. 7 is a configuration diagram of a power conversion device 100 according to a fourth embodiment of the present invention.
  • FIG. 8 is a map showing feasibility of zero voltage switching.
  • FIG. 9 is a configuration diagram of a power conversion device 100 according to a fifth embodiment of the present invention.
  • FIG. 10 is a map showing feasibility of zero voltage switching.
  • the power conversion device 100 includes an AC voltage input section 10 , a class E power conversion circuit 20 , a current sensor 60 and a control section 50 .
  • a load 1 and an AC power supply 2 are connected to the power converter 100 .
  • the class E power conversion circuit 20 has a class E inverter circuit 30 and a rectifier circuit 40 .
  • the class E inverter circuit 30 has an input choke inductor 31, a switch 32, a shunt capacitor 33 connected in parallel with the switch 32, and an LC resonance circuit 34.
  • a high-frequency alternating current is generated by the switch 32 repeatedly turning the high-frequency on and off.
  • the switch 32 is composed of a semiconductor transistor such as a MOSFET (Metal-Oxide-Semiconductor Field-Effect Transistor).
  • MOSFET Metal-Oxide-Semiconductor Field-Effect Transistor
  • a single component capacitor may be arranged as the shunt capacitor 33 connected in parallel with the switch 32 . However, it may not be arranged as an individual component by utilizing the parasitic capacitance of a MOSFET used as a switch.
  • the rectifying circuit 40 rectifies the high frequency current generated by the class E inverter circuit 30 .
  • the rectifier circuit 40 has a diode, a rectifier-side shunt capacitor connected in parallel to the diode, and an output choke inductor.
  • a so-called class E rectifier may be arranged as the rectifier circuit 40 .
  • a so-called class D rectifier consisting of four bridge-connected diodes may be arranged.
  • the higher the operating frequency of the class E power conversion circuit 20 the smaller the inductance and capacitance values required for passive components such as inductors and capacitors used. By utilizing this phenomenon, the power converter 100 can be miniaturized. However, in order to operate the class E power conversion circuit 20 at a high frequency and with high efficiency, it is necessary to reduce the turn-on loss that occurs when switching the switch 32 from off to on.
  • the turn-on loss of the class E power conversion circuit 20 occurs according to the principle described below.
  • the switch 32 is switched from off to on, the shunt capacitor 33 is short-circuited by the switch 32 and the electrostatic energy stored in the shunt capacitor 33 is converted into Joule heat by the switch 32 .
  • the switching loss Psw is expressed by Equation 1 using the capacitance Cs of the shunt capacitor 33 and the voltage Vton across the switch 32 at the instant when the switch 32 is switched from off to on.
  • the class E power conversion circuit 20 uses the current of the LC resonant circuit 34 to zero the voltage across the switch 32 and then turns on, thereby reducing the turn-on loss to zero. Voltage switching (ZVS: Zero Voltage Switching) is performed. With this zero voltage switching, loss can be reduced even if the operating frequency is increased, and the size of the power conversion device 100 can be reduced.
  • ZVS Zero Voltage Switching
  • the zero voltage switching operation of the class E power conversion circuit 20 is not unconditionally established, and various factors such as input voltage, output voltage, input current, output current, switching frequency, ON duty of switch 32, Depending on the conditions, the success or failure of the establishment can be determined. If zero voltage switching is not established, the class E power conversion circuit 20 will generate a large turn-on loss. For this reason, the class E power converter circuit 20 has not been used in applications where there are large changes in input/output conditions. When used, the input/output conditions are stabilized by installing a voltage adjusting means as in the prior art. However, the installation of the voltage adjusting means as described above causes an increase in the size of the power converter.
  • the output current of the class E power conversion circuit 20 is detected, and the ON duty of the switch control signal is set based on the detected output current.
  • current sensor 60 detects the output current of class E power conversion circuit 20 .
  • the controller 50 sets the ON duty of the switch control signal based on the output current detected by the current sensor 60 .
  • the control unit 50 includes a command value generation unit 51 , a comparison unit 52 , an on-duty setting unit 53 and a signal generation unit 54 .
  • the command value generation unit 51 sets a current value to be supplied to the load 1 as an output current command value, and outputs the output current command value to the comparison unit 52 .
  • the signal generation unit 54 generates a control signal so that the measured value and the command value become the values, and outputs the control signal to the switch 32 . Since each of these functions constitutes well-known feedback control, detailed description thereof will be omitted.
  • the on-duty means the ratio of on-intervals to the sum of on-intervals and off-intervals, that is, the ratio of on-intervals in one cycle.
  • the horizontal axis of FIG. 2 indicates the input voltage of the class E power conversion circuit 20 and the vertical axis indicates the switching frequency of the class E power conversion circuit 20 .
  • the values on the horizontal axis range from 0V to 283V, which represent the absolute values of the variation range of the input voltage when the input voltage is 200V AC.
  • the power conversion device 100 will be described as controlling the power factor of the input current to be a high power factor.
  • Control so that the power factor becomes a high power factor means to control the power factor so as to approach one.
  • the power factor of the input current becomes 1 on the turn-on loss contour plot, that is, when the input current becomes a sinusoidal wave similar to the input voltage. 2 is a superposition of the operation trajectories of the class E power conversion circuit 20 of FIG.
  • Reference numeral 70 is the operating locus when the average output current is 2 A
  • reference numeral 71 is the operating locus when the average output current is 4 A
  • reference numeral 72 is the operating locus when the average output current is 6 A
  • reference numeral 73. is the operating locus when the average output current is 8A.
  • a region indicated by reference numeral 80 is a region where zero voltage switching is not established.
  • a region indicated by reference numeral 81 indicates that the turn-on loss becomes zero, and is a region where zero voltage switching is established under the condition that the voltage Vton across the switch 32 at turn-on is 0.
  • the on-duty is reduced compared to Fig. 2. Specifically, in FIG. 3, the on-duty was set to 0.45. Under this on-duty condition, a locus with an average output current of 8 A (reference numeral 73) cannot be drawn. That is, the class E power conversion circuit 20 cannot operate under the condition that the average output current is 8A.
  • the switch drive frequency of the class E power conversion circuit 20 shifts to the low frequency side. It turns out that we need to shift to Comparing the zero voltage switching region (region 81) in FIG.
  • the operating state in which the average output current is 8 A, the ON duty is 0.55, and zero voltage switching is established in the entire AC voltage fluctuation range from 0 V to 283 V. Therefore, when the average output current is to be changed to 2 A, the driving frequency of the switch 32 is changed to the high frequency side in order to reduce the average value of the output current. At this time, a new action can be used in which the zero voltage switching region can be shifted to the high frequency side by reducing the ON duty. For example, if the on-duty is reduced from 0.55 to 0.45, zero-voltage switching can be achieved over the entire AC voltage fluctuation range from 0V to 283V even under the condition that the average output current is 2A.
  • the class E power conversion circuit 20 is a rectifier circuit connected to the class E inverter circuit 30 and the class E inverter circuit 30, and rectifies the high-frequency alternating current generated by the class E inverter circuit 30 into a direct current or a low-frequency alternating current voltage.
  • the class E inverter circuit 30 includes an AC voltage input section 10 to which an AC voltage is input, a switch 32 that switches ON/OFF of the current, an input choke inductor 31 that is connected to at least one end of the switch 32 and the AC voltage input section 10, and an LC resonance circuit 34 connected to the rectifier circuit 40 .
  • the control unit 50 sets the ON duty of the switch 32 based on the output current or output power output from the class E power conversion circuit 20 .
  • the control locus of the switch driving frequency of the class E power converter circuit 20 tends to shift to the low frequency side.
  • increasing the ON duty of the switch 32 shifts the region where zero voltage switching is established to the low frequency side. Therefore, by detecting the magnitude of the output power or the output current and increasing the ON duty of the switch 32 when the output power increases, zero voltage switching is established in a wide range of the output current or output power, and the loss can be reduced.
  • control unit 50 may set the ON duty based on the measured value of the output current or the output power output from the class E power conversion circuit 20 .
  • the control unit 50 may set the ON duty based on the measured value of the output current or the output power output from the class E power conversion circuit 20 .
  • the output current is detected and the ON duty is set based on the detected output current, but the output voltage is separately detected and the output power obtained by multiplying the output voltage and the output current A similar effect can be obtained when the on-duty is set.
  • the second embodiment differs from the first embodiment in that the on-duty setting section 53 sets the on-duty based on the command value (output current command value) acquired from the command value generating section 51 .
  • Reference numerals are used for configurations that overlap with the first embodiment, and descriptions thereof are omitted. The following description will focus on the differences.
  • the ON duty of the switch control signal for the class E power conversion circuit 20 is set based on the command value of the output current. For example, when the power converter 100 is used as a battery charger, the output of the power converter 100 is connected to a load 1 like a battery whose voltage is very stable. At this time, the output voltage of the power converter 100 is predominantly determined by the state of the load 1, and the power converter 100 controls the output current or output power. For example, when the power converter 100 controls the output current as shown in FIG.
  • a control signal is generated so that
  • the cutoff frequency of the current sensor 60 that detects the output current is, for example, 1/1/10 compared to the frequency of the switch control signal of the class E power conversion circuit 20. Control is possible even at frequencies as low as 100. Since it is sufficient if it is sufficiently higher than 100 Hz, control is possible even with a cutoff frequency of about 10 kHz, and when the class E power conversion circuit 20 is operated at 1 MHz, for example, the relationship between these frequencies is about 1:100. However, when a current sensor with such a low cutoff frequency is used, the measured value has a large delay with respect to the current value of the output current. In the second embodiment, by setting the ON duty based on the output current command value, it is possible to establish zero voltage switching without using an expensive current sensor and without receiving a delay in the measured value. .
  • the control unit 50 sets the ON duty based on the output current or output power command value.
  • class E It is possible to perform control to change the output current or output power of the power conversion circuit 20 and set the on-duty in advance. Zero voltage switching can be maintained and losses can be reduced without being affected by delays in sensing output current or output power.
  • current sensors and voltage sensors capable of detecting fluctuations in the output current or output power up to a high frequency band, which contributes to cost reduction.
  • a third embodiment of the present invention will now be described with reference to FIGS.
  • a power converter 100 according to the third embodiment has a voltage sensor 61 as shown in FIG.
  • the ON-Duty setting unit 53 is the product of the output voltage of the class E power conversion circuit 20 detected by the voltage sensor 61 and the output current of the class E power conversion circuit 20 detected by the current sensor 60. Based on the output power The ON duty of the switch control signal for the class E power conversion circuit 20 is set.
  • FIG. 6 shows whether zero voltage switching is established in the entire area within the fluctuation range of the AC input voltage with respect to the on-duty value and the output power average value in the class E power conversion circuit 20 according to the third embodiment.
  • This is a map that evaluates
  • the power conversion device 100 according to the third embodiment refers to the map shown in FIG. 6 and sets the ON duty so that zero voltage switching can be achieved at the average value of the current output power. This makes it possible to set a suitable on-duty that can reduce turn-on loss at the current average output power.
  • the map of FIG. 6 will be described. Average output power is indicated at 0.5 kW, 1 kW, 2 kW and 3 kW. On-duty values are indicated by 0.35, 0.40, 0.45, 0.50, 0.55 and 0.60.
  • the 6 is a map when evaluated by a combination of average output power and on-duty. This evaluation is done in advance. This evaluation is performed by changing the average output power and on-duty in a wider range and with higher resolution in the range where the power conversion device 100 may be used, and by creating a map in advance. It becomes possible to set a more suitable on-duty. If the average output power value is between the resolutions of the average output power value of the pre-evaluated map, by interpolating between them, zero voltage switching is established in the entire area within the fluctuation range of the AC input voltage. It is possible to set a highly probable on-duty.
  • the control unit 50 sets the ON duty based on the relationship between the output current or output power and whether or not zero voltage switching can be achieved. Specifically, the control unit 50 determines whether or not the zero voltage switching is established for the average output power value and the on-duty value, based on the relationship obtained in advance. Under the output power conditions, the ON duty value is set so that zero voltage switching can be achieved over the entire input voltage range. As a result, even if the output voltage of the class E power conversion circuit 20 changes, zero voltage switching can be maintained in a wide range within the AC voltage fluctuation range, and loss can be reduced.
  • the power conversion device 100 includes, as shown in FIG. 7, the output power that is the product of the output current and the output voltage of the class E power conversion circuit 20, the output voltage of the class E power conversion circuit 20, The ON duty of the switch control signal for the class E power conversion circuit 20 is set based on.
  • the power conversion device 100 sets the on-duty based on a map that evaluates the feasibility of zero voltage switching in advance not only for the output current but also for the output voltage. As a result, even if the output voltage changes, it is possible to set a suitable on-duty that can reduce the turn-on loss at the current average output power.
  • the output voltage Vout is 260 V, 340 V, and 420 V
  • the average output power is 0.5 kW, 1 kW, 2 kW, and 3 kW
  • the ON Duty is 0.35, 0.40, 0.45, 0 0.50, 0.55, and 0.60, and explained as a map when these combinations are evaluated.
  • This evaluation is done in advance. This evaluation is performed by changing the average output power and on-duty in a wider range and with higher resolution in the range where the power conversion device 100 may be used, and by creating a map in advance. It becomes possible to set a more suitable on-duty.
  • the output voltage and output power average value are values between the pre-evaluated map resolutions, the probability that zero voltage switching will be established in the entire area within the AC input voltage fluctuation range by interpolating between them. It is possible to set a high on-duty.
  • the control unit 50 sets the ON duty based on the output voltage output from the class E power conversion circuit 20 .
  • the control unit 50 sets the ON duty value based on the output voltage when the zero voltage switching region and the locus of the control frequency change depending on the output voltage. As a result, it is possible to set a suitable ON duty at the current output voltage, maintain zero voltage switching even when the output voltage fluctuates, and reduce loss.
  • control unit 50 may set the ON duty based on the relationship between the output voltage, the output current or output power, and whether or not zero voltage switching can be achieved. As a result, even if the output voltage and output power of the class E power conversion circuit 20 change, zero voltage switching can be maintained in a wide range within the AC voltage fluctuation range, and loss can be reduced.
  • the power converter 100 has a voltage sensor 61 and a voltage sensor 62 as shown in FIG.
  • the AC input voltage of the class E power conversion circuit 20 is also considered to switch the switch of the class E power conversion circuit 20. Set the ON duty of the control signal.
  • the power conversion device 100 of the fifth embodiment sets ON Duty based on a map that evaluates the feasibility of zero voltage switching in advance not only for the output power and the output voltage but also for the AC input voltage, so that the output Even if the voltage changes, it is possible to set a suitable on-duty that can reduce the turn-on loss at the current average output power.
  • the ON Duty when connected to a power system with an AC input voltage Vin of 200 V AC, when the output voltage Vout is 340 V and the average output power is 1 kW, by setting the ON Duty to 0.50, the AC input voltage It operates in the region where zero voltage switching is established in the entire range within the fluctuation range of .
  • the AC input voltage Vin is AC200V and AC240V
  • the output voltage Vout is 260V, 340V and 420V
  • the average output power is 0.5kW, 1kW, 2kW and 3kW
  • the ON duty is 0.5kW. 35, 0.40, 0.45, 0.50, 0.55, and 0.60, and explained as a map when these combinations are evaluated.
  • This evaluation is done in advance. This evaluation is performed by changing the average output power and on-duty in a wider range and with higher resolution in the range where the power conversion device 100 may be used, and by creating a map in advance. It becomes possible to set a more suitable on-duty.
  • the control section 50 sets the ON duty based on the AC voltage value input to the AC voltage input section 10 .
  • the control unit 50 sets the ON duty based on the AC input voltage. do.
  • control unit 50 may set the ON duty based on the relationship between the AC voltage value input to the AC voltage input unit 10, the output current or output power, and whether or not zero voltage switching is achieved. As a result, even if the AC input voltage of the class E power conversion circuit 20 changes, zero voltage switching can be established in a wide range within the AC voltage fluctuation range, and loss can be reduced.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Dc-Dc Converters (AREA)
  • Inverter Devices (AREA)
PCT/IB2022/000092 2022-02-22 2022-02-22 電力変換方法及び電力変換装置 Ceased WO2023161669A1 (ja)

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CN202280092393.6A CN119032500A (zh) 2022-02-22 2022-02-22 电力转换方法以及电力转换装置
EP22927605.0A EP4485785A4 (en) 2022-02-22 2022-02-22 ELECTRIC POWER CONVERSION METHOD AND ELECTRIC POWER CONVERSION DEVICE
PCT/IB2022/000092 WO2023161669A1 (ja) 2022-02-22 2022-02-22 電力変換方法及び電力変換装置
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See also references of EP4485785A4

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CN119032500A (zh) 2024-11-26
JP7825700B2 (ja) 2026-03-06
EP4485785A1 (en) 2025-01-01
JPWO2023161669A1 (https=) 2023-08-31
US20250167660A1 (en) 2025-05-22
EP4485785A4 (en) 2025-03-26

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