WO2025028108A1 - 絶縁型ａｃ／ｄｃコンバータ - Google Patents

絶縁型ａｃ／ｄｃコンバータ Download PDF

Info

Publication number
WO2025028108A1
WO2025028108A1 PCT/JP2024/023672 JP2024023672W WO2025028108A1 WO 2025028108 A1 WO2025028108 A1 WO 2025028108A1 JP 2024023672 W JP2024023672 W JP 2024023672W WO 2025028108 A1 WO2025028108 A1 WO 2025028108A1
Authority
WO
WIPO (PCT)
Prior art keywords
operation mode
semiconductor switch
diode
capacitor
circuit
Prior art date
Legal status (The legal status 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 status listed.)
Pending
Application number
PCT/JP2024/023672
Other languages
English (en)
French (fr)
Japanese (ja)
Inventor
和憲 木寺
尚人 泉本
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Panasonic Intellectual Property Management Co Ltd
Original Assignee
Panasonic Intellectual Property Management 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 Panasonic Intellectual Property Management Co Ltd filed Critical Panasonic Intellectual Property Management Co Ltd
Priority to JP2025537749A priority Critical patent/JPWO2025028108A1/ja
Priority to CN202480046554.7A priority patent/CN121488398A/zh
Publication of WO2025028108A1 publication Critical patent/WO2025028108A1/ja
Anticipated expiration legal-status Critical
Pending legal-status Critical Current

Links

Images

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
    • 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
    • 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
    • H02M7/12—Conversion of AC power input into DC power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode

Definitions

  • This disclosure relates to an isolated AC/DC converter. More specifically, this disclosure relates to an isolated AC/DC converter having a multilevel converter circuit.
  • Patent Document 1 discloses a three-level power conversion device that performs voltage conversion of a DC voltage input from a DC power source.
  • the three-level power conversion device described in Patent Document 1 includes a capacitor circuit including a series circuit of multiple capacitors connected in parallel to the DC power source, and a switching circuit including a series circuit of first to fourth semiconductor switching elements connected in parallel to the capacitor circuit.
  • the purpose of this disclosure is to provide an isolated AC/DC converter that can improve the power factor with simple control.
  • An isolated AC/DC converter includes a first rectifier circuit, a first series circuit, a second series circuit, a third diode, a fourth diode, an inductor, a transformer, a second rectifier circuit, and a control circuit.
  • the first rectifier circuit includes a series circuit of a first diode and a second diode having a cathode connected to the anode of the first diode, and a first end of an AC power supply is connected to a connection point of the first diode and the second diode.
  • the first series circuit includes a first semiconductor switch, a second semiconductor switch, a third semiconductor switch, and a fourth semiconductor switch connected in series between the cathode of the first diode and the anode of the second diode, and a second end of the AC power supply is connected to a connection point of the second semiconductor switch and the third semiconductor switch.
  • the second series circuit includes a series circuit of a first capacitor and a second capacitor, and is connected in parallel with the first series circuit.
  • the third diode has a cathode connected to the connection point of the first semiconductor switch and the second semiconductor switch, and an anode connected to the connection point of the first capacitor and the second capacitor.
  • the fourth diode has an anode connected to the connection point of the third semiconductor switch and the fourth semiconductor switch, and a cathode connected to the connection point of the first capacitor and the second capacitor.
  • the inductor is connected between at least one of the first rectifier circuit and the first series circuit and the AC power source.
  • the transformer has a primary winding connected between the connection point of the second semiconductor switch and the third semiconductor switch and the connection point of the first capacitor and the second capacitor.
  • the second rectifier circuit is connected to the secondary winding of the transformer, and rectifies the current flowing through the secondary winding and outputs it to a load.
  • the control circuit controls each of the first semiconductor switch, the second semiconductor switch, the third semiconductor switch, and the fourth semiconductor switch to an on state or an off state.
  • FIG. 1 is a schematic circuit diagram of an isolated AC/DC converter according to an embodiment of the present disclosure.
  • FIG. 2 is a waveform diagram of an input current of the isolated AC/DC converter and a voltage generated in a primary winding of a transformer.
  • FIG. 3 is a schematic circuit diagram illustrating a current path in the first operation mode in the isolated AC/DC converter.
  • FIG. 4 is a schematic circuit diagram illustrating a current path in the above-mentioned isolated AC/DC converter in a second operation mode.
  • FIG. 5 is a schematic circuit diagram illustrating a current path in the above-mentioned isolated AC/DC converter in a third operation mode.
  • an isolated AC/DC converter 1 of the present embodiment includes a first rectifier circuit 4, a first series circuit 2, a second series circuit 3, a third diode D3, a fourth diode D4, an inductor L1, a transformer 10, a second rectifier circuit 30, and a control circuit 20.
  • the first rectifier circuit 4 includes a series circuit of a first diode D1 and a second diode D2 whose cathode is connected to the anode of the first diode D1.
  • the first end a1 of the AC power supply PS1 is connected to a connection point P5 between the first diode D1 and the second diode D2.
  • the first series circuit 2 includes a first semiconductor switch S1, a second semiconductor switch S2, a third semiconductor switch S3, and a fourth semiconductor switch S4 connected in series between the cathode of the first diode D1 and the anode of the second diode D2.
  • the second end a2 of the AC power supply PS1 is connected to a connection point P1 between the second semiconductor switch S2 and the third semiconductor switch S3.
  • the second series circuit 3 includes a series circuit of a first capacitor C1 and a second capacitor C2, and is connected in parallel with the first series circuit 2.
  • the third diode D3 has a cathode connected to the connection point P3 between the first semiconductor switch S1 and the second semiconductor switch S2, and an anode connected to the connection point P2 between the first capacitor C1 and the second capacitor C2.
  • the fourth diode D4 has an anode connected to the connection point P4 between the third semiconductor switch S3 and the fourth semiconductor switch S4, and a cathode connected to the connection point P2 between the first capacitor C1 and the second capacitor C2.
  • the inductor L1 is connected between at least one of the first rectifier circuit 4 and the first series circuit 2 and the AC power supply PS1. In the circuit shown in FIG. 1, the inductor L1 is connected between the first series circuit 2 and the AC power supply PS1.
  • the transformer 10 has a primary winding 11 connected between a connection point P1 between the second semiconductor switch S2 and the third semiconductor switch S3 and a connection point P2 between the first capacitor C1 and the second capacitor C2.
  • the second rectifier circuit 30 is connected to the secondary winding 12 of the transformer 10, rectifies the current flowing through the secondary winding 12, and outputs it to the load 40.
  • the control circuit 20 controls each of the first semiconductor switch S1, the second semiconductor switch S2, the third semiconductor switch S3, and the fourth semiconductor switch S4 to an on or off state.
  • two circuit elements being connected refers to a state in which the two circuit elements are electrically connected, and is not limited to a state in which the two circuit elements are directly connected, but may include a state in which the two circuit elements are indirectly connected via another circuit element.
  • the isolated AC/DC converter 1 may be abbreviated to converter 1
  • the first to fourth semiconductor switches S1 to S4 may be abbreviated to first to fourth switches S1 to S4, respectively.
  • the second rectifier circuit 30 is abbreviated to "rectifier circuit.”
  • connection point P1 may be abbreviated to the first connection point
  • the connection point P2 may be abbreviated to the second connection point.
  • the control circuit 20 controls each of the first to fourth switches S1 to S4 to an on or off state, thereby controlling the charging voltage of each of the first capacitor C1 and the second capacitor C2. Since a voltage higher than the charging voltage of the first capacitor C1 and the second capacitor C2 is not applied to the first to fourth switches S1 to S4, by controlling the charging voltage of the first capacitor C1 and the second capacitor C2, the voltage applied to the first to fourth switches S1 to S4 can be suppressed, and semiconductor switches with low voltage resistance can be used for the first to fourth switches S1 to S4.
  • a current flows through the primary winding 11 of the transformer 10 and power is supplied to the load 40 connected to the secondary winding 12 of the transformer 10 in an operation mode (first operation mode described later) in which the first switch S1 and the second switch S2 are on and the third switch S3 and the fourth switch S4 are off, and an operation mode (third operation mode described later) in which the third switch S3 and the fourth switch S4 are on and the first switch S1 and the second switch S2 are off.
  • a current roughly proportional to the input voltage Vin from the AC power source PS1 flows through the inductor L1, so that the power factor can be improved with simple control without the control circuit 20 performing complex control.
  • the control circuit 20 can adjust the proportion of the first operation mode and the third operation mode within one switching period in which the first to fourth switches S1 to S4 are switched, thereby adjusting the power supplied to the load 40.
  • FIG. 1 is a schematic circuit diagram of a converter 1.
  • Converter 1 is an isolated AC/DC converter that converts AC voltage input from an AC power source PS1, such as a commercial AC power source, into DC voltage and supplies it to a load 40.
  • an AC power source PS1 such as a commercial AC power source
  • the converter 1 includes the first rectifier circuit 4, the first series circuit 2, the second series circuit 3, the third diode D3, the fourth diode D4, the inductor L1, the transformer 10, the second rectifier circuit 30, and the control circuit 20.
  • the converter 1 also includes a filter circuit F1. Note that the first rectifier circuit 4, the third diode D3, the fourth diode D4, and the transformer 10 are as explained in "(1) Overview", so their explanation will be omitted.
  • the first series circuit 2 includes the first to fourth switches S1 to S4 connected in series between the cathode of the first diode D1 and the anode of the second diode D2.
  • the first to fourth switches S1 to S4 are connected between the cathode of the first diode D1 and the anode of the second diode D2 in the order of the first switch S1, the second switch S2, the third switch S3, and the fourth switch S4.
  • the first to fourth switches S1 to S4 are, for example, N-channel MOSFETs (Metal-Oxide-Semiconductor Field Effect Transistors).
  • Each of the first to fourth switches S1 to S4 is controlled to an on or off state by a control signal input from the control circuit 20 to its gate electrode.
  • the second series circuit 3 has a series circuit of a first capacitor C1 and a second capacitor C2, and is connected in parallel with the first series circuit 2.
  • the capacitance of the first capacitor C1 and the capacitance of the second capacitor C2 are the same value.
  • the circuit constants (e.g., capacitance) of the two circuit elements being the same does not necessarily mean that the circuit constants of the two circuit elements are completely identical, but may also include cases where the difference in the circuit constants of the two circuit elements is small enough to be considered a manufacturing error.
  • the voltage of the connection point P2 between the first capacitor C1 and the second capacitor C2 is half the voltage Vbus between both ends of the second series circuit 3.
  • the control circuit 20 is primarily configured, for example, as a computer system having one or more processors and memory.
  • the functions of the control circuit 20 are realized by the processor of the computer system executing a program recorded in the memory of the computer system.
  • the program may be recorded in the memory, or may be provided via a telecommunications line such as the Internet, or may be recorded on a non-transitory recording medium such as a memory card and provided.
  • the control circuit 20 receives, for example, the voltage Vbus across the second series circuit 3 including the series circuit of the first capacitor C1 and the second capacitor C2, and the voltage V1 across the primary winding 11 of the transformer 10 as feedback.
  • the control circuit 20 controls the power supplied to the load 40 by controlling each of the first to fourth switches S1 to S4 to an on or off state based on the feedback values of the voltage Vbus and the voltage V1, etc.
  • the filter circuit F1 is an LC filter including a coil L2 whose first end is connected to the second end a2 of the AC power supply PS1, and a capacitor C3 connected between the first end a1 of the AC power supply PS1 and the second end of the coil L2.
  • the inductor L1 is connected between the connection point P1 of the second switch S2 and the third switch S3 and the second end a2 of the AC power supply PS1. More specifically, the inductor L1 is connected between the connection point P1 of the second switch S2 and the third switch S3 and the coil L2.
  • the pair of input terminals of the second rectifier circuit 30 are connected to both ends of the secondary winding 12 of the transformer 10.
  • the second rectifier circuit 30 includes, for example, a diode bridge circuit in which a plurality of diodes are bridge-connected.
  • the pair of input terminals of the diode bridge circuit are connected to the secondary winding 12 of the transformer 10.
  • the converter 1 further includes, in the stage subsequent to the second rectifier circuit 30, a smoothing circuit that smoothes the pulsating voltage output from the second rectifier circuit 30.
  • the DC voltage rectified by the second rectifier circuit 30 and smoothed by the smoothing circuit is supplied to the load 40.
  • the control circuit 20 controls each of the first to fourth switches S1 to S4 to an on or off state by outputting a control signal to the gate electrodes of the first to fourth switches S1 to S4.
  • control circuit 20 controls each of the first to fourth switches S1 to S4 to an on or off state so as to periodically repeat the first, second, third, and fourth operation modes.
  • first operation mode the first switch S1 and the second switch S2 are on, and the third switch S3 and the fourth switch S4 are off.
  • second and fourth operation modes the second switch S2 and the third switch S3 are on, and the first switch S1 and the fourth switch S4 are off.
  • third operation mode the third switch S3 and the fourth switch S4 are on, and the first switch S1 and the second switch S2 are off.
  • the control circuit 20 controls the time lengths of the first, second, third and fourth operating modes so that the inductor L1 operates in a discontinuous mode in which the current I1 flowing through the inductor L1 is discontinuous.
  • the control circuit 20 controls the time length of the first operation mode and the time length of the third operation mode to be the same.
  • the control circuit 20 controls the time lengths of the first operation mode, the second operation mode, the third operation mode, and the fourth operation mode so that the voltage Vbus between both ends of the second series circuit 3 is at least twice the peak value of the input voltage Vin input from the AC power supply PS1.
  • the time lengths of the two operation modes being the same is not limited to the time lengths of the two operation modes being completely the same, and can include a state in which the difference in time length between the two operation modes is within ⁇ a few percent (e.g. ⁇ 10%) of either time length.
  • Figs. 2 to 5 explain the current path when the input voltage Vin from the AC power supply PS1 is in a positive half cycle in which the first terminal a1 has a higher potential than the second terminal a2.
  • FIG. 2 is a waveform diagram of the current I1 flowing through the inductor L1 and the voltage V1 generated in the primary winding 11 of the transformer 10.
  • periods t1 to t4 indicate periods during which the device operates in the first to fourth operating modes, respectively.
  • period T1 indicates the period of one switching cycle of the first to fourth switches S1 to S4, and the switching frequency of the first to fourth switches S1 to S4 is, for example, about 100 kHz.
  • FIG. 2 shows the waveform diagram of the current I1 and voltage V1 for one switching cycle.
  • Figs. 3 to 5 are schematic circuit diagrams showing paths along which current flows in the first, second, and third operating modes, respectively.
  • Figs. 3 to 5 show the on/off states of the first to fourth switches S1 to S4, and do not show the control circuit 20.
  • dotted arrows A1 to A5 in Figs. 3 to 5 show paths along which current flows.
  • the control circuit 20 controls the first switch S1 and the second switch S2 to an ON state and controls the third switch S3 and the fourth switch S4 to an OFF state, as shown in FIG. 3.
  • the voltage of the connection point P1 of the second switch S2 and the third switch S3 becomes equal to the voltage Vbus.
  • a current flows through the path of the AC power supply PS1 ⁇ the first diode D1 ⁇ the first switch S1 ⁇ the second switch S2 ⁇ the inductor L1 ⁇ the coil L2 ⁇ the AC power supply PS1 (path of the arrow A1).
  • the current I1 flowing through the inductor L1 gradually increases during the period t1 of the first operation mode (see FIG. 2), and energy is stored in the inductor L1.
  • the inductance of the inductor L1 is L, the current I1 gradually increases at a slope of Vin/L.
  • the first capacitor C1 is connected in parallel with the primary winding 11 of the transformer 10, so that the voltage V1 across the primary winding 11 of the transformer 10 is equal to the charging voltage (Vbus/2) of the first capacitor C1 (see FIG. 2).
  • a current flows through the path (path indicated by arrow A2) of the first capacitor C1 ⁇ first switch S1 ⁇ second switch S2 ⁇ primary winding 11 ⁇ first capacitor C1, and power is supplied to the secondary side of the transformer 10.
  • a second rectifier circuit 30 is connected to the secondary winding 12 of the transformer 10, and the current generated in the secondary winding 12 of the transformer 10 is rectified by the second rectifier circuit 30 and smoothed by the smoothing circuit to generate a DC voltage of a predetermined voltage value, and DC power is supplied to the load 40.
  • the control circuit 20 switches the operation mode of the converter 1 from the first operation mode to the second operation mode.
  • the control circuit 20 controls the second switch S2 and the third switch S3 to the on state and the first switch S1 and the fourth switch S4 to the off state, as shown in FIG. 4.
  • the voltage of the connection point P1 of the second switch S2 and the third switch S3 becomes (Vbus/2).
  • a current flows through the path of AC power supply PS1 ⁇ first diode D1 ⁇ first capacitor C1 ⁇ third diode D3 ⁇ second switch S2 ⁇ inductor L1 ⁇ coil L2 ⁇ AC power supply PS1 (path indicated by arrow A3).
  • the inductor L1 releases the energy stored in the first operation mode and charges the first capacitor C1.
  • the voltage applied to inductor L1 is (Vin-Vbus/2), and since the voltage Vbus is charged to a voltage greater than twice the maximum value of the input voltage Vin, (Vin-Vbus/2) ⁇ 0. Therefore, the current I1 flowing through inductor L1 gradually decreases at a slope of (Vin-Vbus/2)/L.
  • both ends of the primary winding 11 of the transformer 10 are short-circuited in both directions via the series circuit of the second switch S2 and the third diode D3, and the series circuit of the third switch S3 and the fourth diode D4, so that no current flows through the primary winding 11 and no power is supplied to the secondary side of the transformer 10.
  • the control circuit 20 switches the operation mode of the converter 1 from the second operation mode to the third operation mode.
  • the control circuit 20 controls the third switch S3 and the fourth switch S4 to an on state and the first switch S1 and the second switch S2 to an off state, as shown in FIG. 5.
  • the voltage of the connection point P1 of the second switch S2 and the third switch S3 becomes 0.
  • a current flows through the path (path indicated by arrow A4) of AC power supply PS1 ⁇ first diode D1 ⁇ first capacitor C1 ⁇ second capacitor C2 ⁇ fourth switch S4 ⁇ third switch S3 ⁇ inductor L1 ⁇ coil L2 ⁇ AC power supply PS1, and the inductor L1 releases energy to charge the first capacitor C1 and the second capacitor C2.
  • the voltage applied to inductor L1 is (Vin-Vbus), and since the voltage Vbus is charged to a voltage greater than twice the maximum value of the input voltage Vin, (Vin-Vbus) ⁇ 0. Therefore, the current I1 flowing through inductor L1 gradually decreases at a slope of (Vin-Vbus)/L (see FIG. 2).
  • the control circuit 20 controls the time length of the first operation mode (period t1) and the time length of the third operation mode (period t3) to be the same, so in the second operation mode or the third operation mode, the current I1 always decreases to zero, and the current I1 does not flow until it switches back to the first operation mode.
  • the second capacitor C2 is connected in parallel with the primary winding 11 of the transformer 10, and the voltage V1 across the primary winding 11 of the transformer 10 is equal to (-Vbus/2) (see FIG. 2).
  • a current flows through the path (path indicated by arrow A5) of the second capacitor C2 ⁇ primary winding 11 ⁇ third switch S3 ⁇ fourth switch S4 ⁇ second capacitor C2, and power is supplied to the secondary side of the transformer 10.
  • the control circuit 20 switches the operation mode of the converter 1 from the third operation mode to the fourth operation mode.
  • the control circuit 20 controls the second switch S2 and the third switch S3 to the on state and the first switch S1 and the fourth switch S4 to the off state.
  • the states of the first to fourth switches S1 to S4 in the fourth operation mode are the same as the states of the first to fourth switches S1 to S4 in the second operation mode.
  • both ends of the primary winding 11 of the transformer 10 are short-circuited in both directions via the series circuit of the second switch S2 and the third diode D3 and the series circuit of the third switch S3 and the fourth diode D4, so that no current flows through the primary winding 11 and no power is supplied to the secondary side of the transformer 10.
  • the discharge of the inductor L1 ends and the current I1 becomes zero, so that the current I1 does not flow in the fourth operation mode either.
  • the control circuit 20 switches the operation mode of the converter 1 from the fourth operation mode to the first operation mode.
  • the operation of the first operation mode is as described above.
  • the current I1 is zero from the middle of the third operation mode to the start of the first operation mode, so the first switch S1 can be switched from the off state to the on state while the current I1 is zero. Since the first switch S1 switches from the off state to the on state in the zero current state, the switching loss can be reduced by performing zero current switching (ZCS).
  • ZCS zero current switching
  • the control circuit 20 controls the first to fourth switches S1 to S4 so that the first, second, third, and fourth operation modes are repeated periodically in this order, and the voltage Vbus between both ends of the second series circuit 3 and the voltage V1 applied to the primary winding 11 of the transformer 10 can be controlled.
  • the converter 1 of this embodiment is a multilevel converter circuit in which the voltage at the connection point between the second switch S2 and the third switch S3 changes to three levels: Vbus, (Vbus/2), and 0.
  • the control circuit 20 controls the time lengths of the first, second, third, and fourth operation modes so that the time lengths of the first and third operation modes are the same, and the voltage Vbus between both ends of the second series circuit 3 is more than twice the peak value of the input voltage Vin input from the AC power supply PS1.
  • the current I1 becomes zero during operation in the third operation mode, and switching operation can be performed in a discontinuous mode in which the current I1 is discontinuous.
  • the current I1 flows in a manner roughly proportional to the input voltage Vin from the AC power supply PS1, which has the advantage of improving the power factor with simple control.
  • control circuit 20 controls the first to fourth switches S1 to S4 to periodically repeat the first, second, third and fourth operation modes in this order.
  • energy is stored in the inductor L1 during the third operation mode, and the energy stored in the inductor L1 is released during the fourth operation mode and the first operation mode that follow the third operation mode.
  • the converter 1 supplies power to the secondary side of the transformer 10 in the first and third operation modes, and stops the power supply to the secondary side of the transformer 10 in the second and fourth operation modes.
  • the control circuit 20 controls the time length of the first and third operation modes to be the same, and controls the power supply to the load 40 by adjusting the ratio between the total time length of the first and third operation modes and the total time length of the second and fourth operation modes.
  • the greater the ratio of the time length of the first and third operation modes in one cycle T1 of the switching period the more the power supplied to the load 40 increases, so the control circuit 20 can adjust the period during which power is supplied to the secondary side of the transformer 10 by adjusting the ratio between the total time length of the first and third operation modes and the total time length of the second and fourth operation modes.
  • the control circuit 20 can adjust the power supply to the load 40 without changing the switching frequency of the first to fourth switches S1 to S4.
  • the converter 1 in the present disclosure includes a computer system.
  • the computer system is mainly composed of a processor and a memory as hardware.
  • the function of the converter 1 in the present disclosure as the control circuit 20 is realized by the processor executing a program recorded in the memory of the computer system.
  • the program may be pre-recorded in the memory of the computer system, may be provided through a telecommunications line, or may be recorded and provided on a non-transitory recording medium such as a memory card, an optical disk, or a hard disk drive that can be read by the computer system.
  • the processor of the computer system is composed of one or more electronic circuits including a semiconductor integrated circuit (IC) or a large scale integrated circuit (LSI).
  • IC semiconductor integrated circuit
  • LSI large scale integrated circuit
  • the integrated circuits such as ICs or LSIs referred to here are called different names depending on the degree of integration, and include integrated circuits called system LSIs, VLSIs (Very Large Scale Integration), or ULSIs (Ultra Large Scale Integration).
  • a field-programmable gate array (FPGA) that is programmed after the LSI is manufactured, or a logic device that allows the reconfiguration of the connection relationships within the LSI or the reconfiguration of the circuit partitions within the LSI, can also be used as a processor.
  • FPGA field-programmable gate array
  • Multiple electronic circuits may be integrated into one chip, or may be distributed across multiple chips. Multiple chips may be integrated into one device, or may be distributed across multiple devices.
  • the computer system referred to here includes a microcontroller having one or more processors and one or more memories.
  • the microcontroller is also composed of one or more electronic circuits including a semiconductor integrated circuit or a large-scale integrated circuit.
  • control circuit 20 controls the first operation mode, the second operation mode, the third operation mode, and the fourth operation mode to be periodically repeated, but the operation mode in which the current flowing through the inductor L1 is zero and no power is supplied to the secondary side of the transformer 10 can be omitted as appropriate.
  • control circuit 20 may control the first operation mode, the second operation mode, and the third operation mode to be periodically repeated by setting the period of the fourth operation mode to zero in a positive half cycle in which the first terminal a1 of the AC power supply PS1 is at a higher potential than the second terminal a2.
  • control circuit 20 may control the first operation mode, the third operation mode, and the fourth operation mode to be periodically repeated by setting the period of the second operation mode to zero in a negative half cycle in which the first terminal a1 of the AC power supply PS1 is at a lower potential than the second terminal a2. In this way, there is an advantage in that the switching period can be shortened by omitting the fourth operation mode or the second operation mode and controlling the remaining three operation modes to be periodically repeated.
  • the first to fourth semiconductor switches S1 to S4 are N-channel MOSFETs, but the first to fourth semiconductor switches S1 to S4 may be semiconductor switches such as bipolar transistors or IGBTs (Insulated Gate Bipolar Transistors).
  • the inductor L1 is connected between the first series circuit 2 and the AC power supply PS1, but the inductor L1 may be connected between the first rectifier circuit 4 and the AC power supply PS1, that is, between the connection point P5 of the first diode D1 and the second diode D2 and the first end a1 of the AC power supply PS1.
  • the inductor L1 may be connected between the first series circuit 2 and the AC power supply PS1, and between the first rectifier circuit 4 and the AC power supply PS1.
  • the converter 1 includes a filter circuit F1 such as an LC filter, but the circuit configuration of the filter circuit F1 can be changed as appropriate. Also, the filter circuit F1 is not an essential component of the converter 1, and can be omitted as appropriate.
  • the second rectifier circuit 30 including a diode bridge circuit is connected to the secondary side of the transformer 10, but the configuration of the second rectifier circuit 30 can be changed as appropriate, and may be a full-bridge type synchronous rectifier circuit composed of semiconductor switches, etc.
  • the isolated AC/DC converter (1) of the first aspect includes a first rectifier circuit (4), a first series circuit (2), a second series circuit (3), a third diode (D3), a fourth diode (D4), an inductor (L1), a transformer (10), a second rectifier circuit (30), and a control circuit (20).
  • the first rectifier circuit (4) includes a series circuit of a first diode (D1) and a second diode (D2) having a cathode connected to the anode of the first diode (D1), and a first end (a1) of an AC power supply (PS1) is connected to the connection point of the first diode (D1) and the second diode (D2).
  • the first series circuit (2) includes a first semiconductor switch (S1), a second semiconductor switch (S2), a third semiconductor switch (S3), and a fourth semiconductor switch (S4) connected in series between the cathode of the first diode (D1) and the anode of the second diode (D2), and a second end (a2) of the AC power supply (PS1) is connected to a connection point between the second semiconductor switch (S2) and the third semiconductor switch (S3).
  • the second series circuit (3) includes a series circuit of a first capacitor (C1) and a second capacitor (C2), and is connected in parallel with the first series circuit (2).
  • the third diode (D3) has a cathode connected to the connection point between the first semiconductor switch (S1) and the second semiconductor switch (S2), and an anode connected to the connection point between the first capacitor (C1) and the second capacitor (C2).
  • the fourth diode (D4) has an anode connected to the connection point of the third semiconductor switch (S3) and the fourth semiconductor switch (S4), and a cathode connected to the connection point of the first capacitor (C1) and the second capacitor (C2).
  • the inductor (L1) is connected between at least one of the first rectifier circuit (4) and the first series circuit (2) and an AC power source (PS1).
  • the transformer (10) has a primary winding (11) connected between the connection point of the second semiconductor switch (S2) and the third semiconductor switch (S3) and the connection point of the first capacitor (C1) and the second capacitor (C2).
  • the second rectifier circuit (30) is connected to the secondary winding (12) of the transformer (10), and rectifies the current flowing through the secondary winding (12) and outputs it to the load (40).
  • the control circuit (20) controls each of the first semiconductor switch (S1), the second semiconductor switch (S2), the third semiconductor switch (S3), and the fourth semiconductor switch (S4) to an on or off state.
  • a current flows through the primary winding (11) of the transformer (10), and power is supplied to the load (40) connected to the secondary winding (12) of the transformer (10).
  • a third operating mode in which the third semiconductor switch (S3) and the fourth semiconductor switch (S4) are in an ON state and the first semiconductor switch (S1) and the second semiconductor switch (S2) are in an OFF state, a current flows through the primary winding (11) of the transformer (10), and power is supplied to the load (40) connected to the secondary winding (12) of the transformer (10).
  • control circuit (20) can adjust the ratio of the first operation mode and the third operation mode within one switching period in which the first to fourth semiconductor switches (S1 to S4) are switched, thereby adjusting the power supplied to the load (40). Furthermore, since a current roughly proportional to the input voltage from the AC power supply (PS1) flows through the inductor (L1), an isolated AC/DC converter (1) capable of improving the power factor can be realized with simple control.
  • the capacitance of the first capacitor (C1) is the same as the capacitance of the second capacitor (C2).
  • the voltage at the connection point between the first capacitor (C1) and the second capacitor (C2) can be set to half the voltage (Vbus) between both ends of the second series circuit (3).
  • the control circuit (20) controls to periodically repeat the first, second, third, and fourth operation modes.
  • the first semiconductor switch (S1) and the second semiconductor switch (S2) are in the ON state
  • the third semiconductor switch (S3) and the fourth semiconductor switch (S4) are in the OFF state.
  • the second semiconductor switch (S2) and the third semiconductor switch (S3) are in the ON state
  • the first semiconductor switch (S1) and the fourth semiconductor switch (S4) are in the OFF state.
  • the third semiconductor switch (S3) and the fourth semiconductor switch (S4) are in the ON state
  • the first semiconductor switch (S1) and the second semiconductor switch (S2) are in the OFF state.
  • control circuit (20) controls the time lengths of the first, second, third and fourth operating modes so that the inductor (L1) operates in a discontinuous mode in which the current flowing through the inductor (L1) is discontinuous.
  • control circuit (20) controls the time length of the first operation mode and the time length of the third operation mode to be the same, and controls the time lengths of the first operation mode, second operation mode, third operation mode, and fourth operation mode so that the voltage (Vbus) between both ends of the second series circuit (3) is at least twice the peak value of the input voltage (Vin) input from the AC power supply (PS1).
  • control circuit (20) controls the time length of the first operation mode and the time length of the third operation mode to be the same.
  • the control circuit (20) controls the power supply to the load (40) by adjusting the ratio between the total time length of the first operation mode and the third operation mode and the total time length of the second operation mode and the fourth operation mode.
  • power is supplied to the load (40) in the first and third operating modes, and power supply to the load (40) is stopped in the second and fourth operating modes, so that the power supply to the load (40) can be controlled by adjusting the ratio between the time length of the first operating mode (or the time length of the second operating mode) and the time length of the second operating mode (or the time length of the fourth operating mode).
  • the control circuit (20) controls the first, second, and third operation modes to be periodically repeated with the period of the fourth operation mode set to zero during a positive half cycle in which the first terminal (a1) of the AC power supply (PS1) is at a higher potential than the second terminal (a2).
  • the control circuit (20) controls the first, third, and fourth operation modes to be periodically repeated with the period of the second operation mode set to zero during a negative half cycle in which the first terminal (a1) of the AC power supply (PS1) is at a lower potential than the second terminal (a2).
  • the second rectifier circuit (30) includes a diode bridge circuit.
  • the second rectifier circuit (30) is configured as a diode bridge circuit that does not require control, so the configuration of the control circuit (20) can be simplified.
  • the configurations according to the second to eighth aspects are not essential for the isolated AC/DC converter (1) and may be omitted as appropriate.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Rectifiers (AREA)
PCT/JP2024/023672 2023-07-28 2024-06-28 絶縁型ａｃ／ｄｃコンバータ Pending WO2025028108A1 (ja)

Priority Applications (2)

Application Number Priority Date Filing Date Title
JP2025537749A JPWO2025028108A1 (https=) 2023-07-28 2024-06-28
CN202480046554.7A CN121488398A (zh) 2023-07-28 2024-06-28 隔离式ac/dc转换器

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2023-123801 2023-07-28
JP2023123801 2023-07-28

Publications (1)

Publication Number Publication Date
WO2025028108A1 true WO2025028108A1 (ja) 2025-02-06

Family

ID=94394362

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2024/023672 Pending WO2025028108A1 (ja) 2023-07-28 2024-06-28 絶縁型ａｃ／ｄｃコンバータ

Country Status (3)

Country Link
JP (1) JPWO2025028108A1 (https=)
CN (1) CN121488398A (https=)
WO (1) WO2025028108A1 (https=)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2015027169A (ja) * 2013-07-26 2015-02-05 新電元工業株式会社 絶縁型マルチレベルコンバータ
WO2016031061A1 (ja) * 2014-08-29 2016-03-03 新電元工業株式会社 力率改善コンバータ、及び、力率改善コンバータを備えた電源装置
JP2019097300A (ja) * 2017-11-22 2019-06-20 富士電機株式会社 ３レベル電力変換装置
WO2022023527A1 (en) * 2020-07-30 2022-02-03 Prodrive Technologies Innovation Services B.V. Multi-level bidirectional electrical ac/dc converter

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2015027169A (ja) * 2013-07-26 2015-02-05 新電元工業株式会社 絶縁型マルチレベルコンバータ
WO2016031061A1 (ja) * 2014-08-29 2016-03-03 新電元工業株式会社 力率改善コンバータ、及び、力率改善コンバータを備えた電源装置
JP2019097300A (ja) * 2017-11-22 2019-06-20 富士電機株式会社 ３レベル電力変換装置
WO2022023527A1 (en) * 2020-07-30 2022-02-03 Prodrive Technologies Innovation Services B.V. Multi-level bidirectional electrical ac/dc converter

Also Published As

Publication number Publication date
JPWO2025028108A1 (https=) 2025-02-06
CN121488398A (zh) 2026-02-06

Similar Documents

Publication Publication Date Title
CN100527581C (zh) 开关电源电路
TWI849969B (zh) 轉換裝置
US20080252145A1 (en) Dc/dc power conversion device
JP2018098998A (ja) 絶縁同期整流型ｄｃ／ｄｃコンバータ、同期整流コントローラ、電源アダプタおよび電子機器
KR102034149B1 (ko) 단일 전력단 교류/직류 컨버터
US11973440B2 (en) Isolated DC/DC converter with secondary-side full bridge diode rectifier and asymmetrical auxiliary capacitor
JP4323049B2 (ja) 電力変換装置
CN203617925U (zh) 用于电压转换器的电路和电压转换器以及包括该电路的斩波器
JP2003070249A (ja) スイッチング電源装置
JP6314734B2 (ja) 電力変換装置
JP2017005861A (ja) 共振型双方向ｄｃ／ｄｃコンバータ
JPH05176532A (ja) 電源回路
JP2015228760A (ja) スイッチング電源装置
WO2025028108A1 (ja) 絶縁型ａｃ／ｄｃコンバータ
WO2025028110A1 (ja) 絶縁型ａｃ／ｄｃコンバータ
WO2023127464A1 (ja) 電力変換システム
JP2003018834A (ja) スイッチング電源回路
JP3354454B2 (ja) スイッチング電源装置
JPH01218352A (ja) スイッチング電源回路
KR102076577B1 (ko) 양방향 직류-직류 컨버터
JP7122630B2 (ja) スナバ回路、及び電力変換システム
JP7782307B2 (ja) 電力変換装置
TWI762415B (zh) 可升降壓的雙向直流-直流諧振轉換器及其控制方法
CN121569432A (zh) 转换器装置
WO2025187147A1 (ja) 電力変換装置および制御方法

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 24848767

Country of ref document: EP

Kind code of ref document: A1

WWE Wipo information: entry into national phase

Ref document number: 2501008662

Country of ref document: TH

ENP Entry into the national phase

Ref document number: 2025537749

Country of ref document: JP

Kind code of ref document: A

WWE Wipo information: entry into national phase

Ref document number: 2025537749

Country of ref document: JP

NENP Non-entry into the national phase

Ref country code: DE