Power converter and control method for the inverter of the power converter

Abstract

This invention provides a power conversion device that controls an inverter circuit in response to changes in the control amount of a rectifier. [Solution] The present invention relates to a power conversion device that transmits power from a power supply coil 11 to a power output coil 21 in a non-contact manner and outputs power through a rectifier 23, and is characterized in that it comprises an inverter circuit 13 electrically connected to the power supply coil 11, an AC power supply 46 electrically connected to the inverter circuit 13, a conversion unit 30 electrically connected to the inverter circuit 13, and a phase detector 32 electrically connected to the inverter circuit 13, and drives the inverter circuit 13 with the gate signal generated by the PWM control unit 34.

Description

Technical Field

[0001] The present invention relates to a power conversion device and a control method for an inverter of the power conversion device.

Background Art

[0002] A conventional power conversion device has a configuration without a DC-DC converter relative to the circuit configuration shown in FIG. 1, and adjusts the supplied power by independently controlling the conduction angle αinv of the switches in the inverter circuit 13 and the conduction angle αarc of the switches in the rectifier 23. A technology related to this is disclosed in Patent Document 1.

[0003] Since the rectifier 23 is disposed immediately before the external power supply unit, it can be said that the control amount of the rectifier 23 most directly reflects the power supplied to the outside in the system. Then, as the phase difference φarc of the rectifier 23 changes, the phase difference φinv between the inverter current Iinv and the inverter voltage Vinv output from the inverter circuit 13 shown in FIG. 5 is also affected in operation. When the phase difference φinv increases, the conduction loss in the inverter circuit 13 increases, and the efficiency deteriorates. Further, when the phase difference φinv falls below a predetermined value, the current at the time of ZVS (Zero Voltage Switching) becomes insufficient, resulting in a hard switching state, which causes an increase in harmonic noise and, depending on the state, destruction of the FET (Field Effect Transistor) device.

[0004] Accordingly, there is a demand for a control scheme for avoiding factors of reduced efficiency and increased noise by correcting the phase of the inverter circuit 13 and operating in coordination with the operation of the rectifier 23.

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

Summary of the Invention

[0006] Various aspects of the present invention aim to provide a power converter and a method for controlling the inverter of a power converter, which control an inverter circuit in response to changes in the control amount of a rectifier. [Means for solving the problem]

[0007] Various aspects of the present invention will be described below.

[0008] [1] In a power conversion device that transmits power from a power supply coil to a power output coil in a non-contact manner, thereby outputting power through a power output resonant circuit and a rectifier, A power supply side resonant circuit electrically connected to the power supply side coil, An inverter circuit electrically connected to the power supply side resonant circuit, A PFC (Power Factor Correction) circuit is electrically connected to the inverter circuit, An AC power supply electrically connected to the PFC circuit, It has, When outputting the aforementioned power, a phase detector is provided to detect the phase difference between the inverter current and the inverter voltage input from the power supply side resonant circuit to the inverter circuit, which is caused by a change in the control amount of the rectifier. A PI controller that inputs the phase difference detected by the phase detector and the deviation of the phase command value, A PWM control unit receives the phase amount adjusted and output by the PI controller and generates a gate signal for the inverter with the phase amount corrected, It has, A power conversion device characterized by driving the inverter circuit with the gate signal generated by the PWM control unit.

[0009] According to the power conversion device described in [1] above in one aspect of the present invention, a phase detector detects the phase difference between the inverter current and inverter voltage input from the power supply side resonant circuit to the inverter circuit, which is caused by a change in the control amount of the rectifier. This phase difference and the deviation of the phase command value are input to the PI controller, and the phase amount adjusted and output by the PI controller is input to the PWM control unit. The PWM control unit generates a gate signal for the inverter with the phase amount corrected, and the inverter circuit is driven by this gate signal. As a result, even if a phase difference occurs between the inverter current and inverter voltage input to the independently controlled inverter circuit due to a change in the control amount of the independently controlled rectifier, the PI controller corrects the deviation between the phase difference and the phase command value, and the PWM control unit drives the inverter circuit with the generated gate signal, thereby keeping the phase difference constant and reducing conduction loss during ZVS, thereby achieving high efficiency and avoiding factors that increase noise.

[0010] [2] In the above [1], A DC-DC converter circuit is arranged between the inverter circuit and the PFC circuit. A power conversion device characterized in that the inverter circuit is electrically connected to the DC-DC converter circuit, and the DC-DC converter circuit is electrically connected to the PFC circuit.

[0011] According to the power conversion device [2] described above in one aspect of the present invention, in the power conversion device [1] described above, the DC-DC converter circuit is arranged between the inverter circuit and the PFC circuit and is electrically connected to both. By adopting such a configuration, the operating range of the voltage input to the inverter circuit can be widened.

[0012] [3] In the above [1] or [2], A power converter characterized in that the vehicle's battery is charged when the power converter outputs the power.

[0013] [4] In a power conversion device that outputs power through a rectifier by transmitting power from a power supply coil to a power output coil in a non-contact manner, An inverter circuit electrically connected to the power supply coil, An AC power supply electrically connected to the inverter circuit, It has, A power conversion device characterized in that, when outputting the aforementioned power, the inverter circuit is driven by a gate signal generated based on a change in the control amount of the rectifier.

[0014] According to the power conversion device described in [4] above in one aspect of the present invention, the inverter circuit is driven by a gate signal generated based on a change in the control amount of a rectifier located near the power output section. This reduces conduction losses in the inverter circuit, thereby improving efficiency and avoiding factors that increase noise.

[0015] [5] In the above [4], The system further includes a phase detector that detects the phase difference between the inverter current input from the power supply coil to the inverter circuit and the inverter voltage, which is caused by a change in the control amount of the rectifier. A power conversion device characterized by driving the inverter circuit with a gate signal generated based on the phase difference.

[0016] According to the power conversion device described in [5] above in one aspect of the present invention, a phase detector is attached to the power conversion device to detect the phase difference between the inverter current input to the inverter circuit from the power supply side coil and the inverter voltage, which is caused by a change in the control amount of a rectifier located close to the power output section, and the inverter circuit is driven by a gate signal generated based on the phase difference. As a result, conduction loss in the inverter circuit is reduced, and efficiency is improved and factors that increase noise are avoided.

[0017] [6] In the above [5], A power supply side resonant circuit is disposed between the power supply side coil and the inverter circuit and is electrically connected to both, A power output side resonant circuit is disposed between the power output side coil and the rectifier and electrically connected to both, A power conversion device, further comprising:

[0018] [7] In the above [5] or [6], further comprising a PI controller that receives a deviation between the phase difference detected by the phase detector and a phase command value, and outputs a PI-controlled phase amount, wherein the gate signal generated based on the phase difference is a gate signal output from the PWM control unit and generated based on the phase amount.

[0019] According to the power conversion device of the above [7] according to one aspect of the present invention, the gate signal is adjusted by PI control so as to approach the phase command value, the conduction loss is minimized, and high efficiency can be achieved.

[0020] [8] A control method for an inverter circuit of a power conversion device, which outputs power through a power output side resonant circuit and a rectifier by transmitting power in a non-contact state from a power supply side coil electrically connected to an AC power supply, a PFC circuit, the inverter circuit and a power supply side resonant circuit to a power output side coil, the control method comprising: when outputting the power, detecting a phase difference between an inverter current and an inverter voltage input from the power supply side resonant circuit to the inverter circuit, the phase difference being caused by a change in a control amount of the rectifier; adjusting a phase amount by PI control based on a deviation between the phase difference and a phase command value; generating a gate signal of the inverter by PWM control based on the phase amount; driving the inverter circuit with the gate signal.

[0021] According to the control method for an inverter of a power conversion device of the above [8] according to one aspect of the present invention, the same effect as that of the power conversion device of the above [1] can be expected.

[0022] [9] In the above [8], A method for controlling the inverter of a power converter, characterized in that the onboard battery is charged when the power converter outputs the power.

[0023]

[10] A control method for the inverter circuit of a power converter that outputs power through a rectifier by transmitting power in a non-contact manner from a power supply coil electrically connected to an AC power source and an inverter circuit to a power output coil, When outputting the aforementioned power, a gate signal is generated based on the change in the control amount of the rectifier. A method for controlling the inverter of a power conversion device, characterized in that the inverter circuit is driven by the gate signal.

[0024] According to the inverter control method of the power converter described in

[10] above in one aspect of the present invention, a gate signal is generated based on a change in the control amount of a rectifier located near the power output section, and the inverter circuit is driven by this gate signal. Therefore, even when the operating state of the rectifier changes, conduction loss in the inverter circuit can be reduced, thereby improving efficiency and avoiding factors that increase noise. [Effects of the Invention]

[0025] According to various aspects of the present invention, it is possible to provide a power converter and an inverter control method for a power converter that achieve high efficiency by reducing conduction loss and avoid noise-generating factors. [Brief explanation of the drawing]

[0026] [Figure 1] This is a circuit diagram showing the circuit configuration of a power conversion device according to one aspect of the present invention. [Figure 2] This is a circuit diagram showing the control configuration of an inverter circuit in a power conversion device according to one aspect of the present invention. [Figure 3] This is a circuit diagram showing the circuit configuration of a power conversion device 40 according to one aspect of the present invention. [Figure 4]This figure illustrates how a power conversion device according to one aspect of the present invention suppresses the increase in the phase difference φinv by operating the inverter circuit in coordination with the operation of the rectifier 23. [Figure 5] This diagram illustrates how the phase difference φinv of the inverter circuit 13 is affected and operates in accordance with the change in the phase difference φarc of the rectifier 23. [Modes for carrying out the invention]

[0027] Embodiments of the present invention will be described in detail below with reference to the drawings. However, it will be readily apparent to those skilled in the art that the present invention is not limited to the following description, and that its form and details can be modified in various ways without departing from the spirit and scope of the present invention. Accordingly, the present invention shall not be construed as being limited to the descriptions of the embodiments shown below.

[0028] (Embodiment 1) Figure 1 is a circuit diagram illustrating a power conversion device according to one aspect of the present invention. Figure 2 is a circuit diagram and schematic diagram illustrating in detail the control of the power output side inverter circuit 13 shown in Figure 1. Figure 3 is a circuit diagram illustrating a power conversion device 40 according to one aspect of the present invention. Figure 4 is a diagram illustrating how the power conversion device according to one aspect of the present invention suppresses the increase in phase difference φinv by operating the inverter circuit in coordination with the operation of the rectifier 23. Figure 5 is a diagram illustrating how the phase difference φinv of the inverter circuit 13 is affected and operates in accordance with the change in the phase difference φarc of the rectifier 23.

[0029] The power converter 40 shown in Figure 3 is a system that transmits power from the power supply coil 11 of the power supply system 40GA to the power output coil 21 of the power output system 40VA in a non-contact manner. It is desirable that the power supply coil 11 and the power output coil 21 face each other and that the distance between them is a predetermined distance. This predetermined distance can be appropriately changed to a suitable distance according to the application of the device. The power supply coil 11 and the power output coil 21 transmit power to each other by electromagnetic induction. This power transmission can be performed using a magnetic field resonance method by adding a resonant circuit, described later, to the power converter 40.

[0030] As shown in Figure 3, the power converter 40 has a power supply coil 11, to which an inverter circuit 13 is electrically connected. A power supply 46 is electrically connected to the inverter circuit 13, and an AC voltage corresponding to the gate signal drive frequency is output to the power supply coil 11. The power supply 46 is assumed to be a DC power supply. This causes the current flowing through the power supply coil 11 to fluctuate, generating an electromotive force in the power output coil 21, and AC power is input to the rectifier 23 electrically connected to the power output coil 21. In the rectifier 23, a configuration in which the conduction angle αarc is actively varied is also called an Active Rectifier (ARC). The voltage and current converted to DC by the rectifier 23 become the output of the power converter 40. Alternatively, a configuration without a rectifier 23 is possible. In this case, AC power is output to the outside of the power converter 40.

[0031] To understand the electrical state of the power converter 40, eight voltage and current measurement points P_S1, P_S2, P_inv1, P_inv2, P_arc1, P_arc2, P_O1, and P_O2 can be provided. Of these measurement points, P_inv1 and P_inv2 are essential in this embodiment, while the others may be provided at will. By providing P_S1 on one of the two conductive wires electrically connecting the power supply 46 and the inverter circuit 13, and P_S2 on the other, the voltage and current values ​​applied from the power supply 46 to the inverter circuit 13 can be measured. By providing P_inv1 and P_inv2, the voltage and current values ​​between the inverter circuit 13 and the power supply coil 11 can be measured. By providing P_arc1 on one of the two conductive wires electrically connecting the power output coil 21 and the rectifier 23, and P_arc2 on the other, the voltage and current values ​​between the power output coil 21 and the rectifier 23 can be measured. By providing P_O1 on one of the two conductive wires that output power from the rectifier 23 to the outside and P_O2 on the other, the voltage and current values ​​output from the rectifier 23 to the outside can be measured.

[0032] To set the external output power from the rectifier 23 to a specified value, the measured power is calculated from the output current measured at P_O1 or P_O2 and the output voltage between P_O1 and P_O2, and the conduction angle of the rectifier 23 is adjusted so that the external output power reaches the specified value.

[0033] Figure 5 shows how the phase difference φinv of the inverter circuit 13 is affected and operates in accordance with the change in the phase difference φarc of the rectifier 23, in the case where the power supply 46 is a DC power supply. The third row from the top of Figure 5 shows the voltage Varc applied from the rectifier 23 to the power output coil 21, and the bottom row of Figure 5 shows the current Iinv flowing from the rectifier 23 to the power output coil 21. In the third row from the top of Figure 5, the state before the timing of the voltage Varc rising from zero to a predetermined positive value is shown with a dashed line, and the state after the delay is shown with a solid line. Due to this delay, the current flowing from the rectifier 23 to the inverter circuit 13 via the power output coil 21 and the power supply coil 11 changes. The top row of Figure 5 shows the inverter voltage Vinv applied from the power supply coil 11 to the inverter circuit 13, and the second row shows the inverter current Iinv output from the power supply coil 11 to the inverter circuit 13. In the second diagram, the inverter current Iinv before the change in the phase difference φarc of the rectifier 23 is shown by a dashed line, and the inverter current Iinv after the change is shown by a solid line. As shown in the diagram, before the change, when the inverter voltage Vinv rises from zero to a predetermined positive value, the value of the inverter current Iinv is zero. After the change, a state occurs where the inverter current Iinv is negative when the inverter voltage Vinv is positive, and conduction loss occurs while this state continues, so the conduction loss increases compared to before the change in inverter current Iinv.

[0034] By measuring the voltage Vinv using P_inv1 and P_inv2, and the current Iinv using either P_inv1 or P_inv2, the following feedback control can be achieved.

[0035] First, let's explain the inverter circuit 13 shown in the upper part of Figure 2, which is the object of control. The inverter circuit 13 consists of four elements, Qinv_A, Qinv_B, Qinv_C, and Qinv_D, each being a pair of diodes and transistors. The input from the power supply 46 is received via P_S1 and P_S2, if they are provided in the circuit, and the output is sent to the power supply coil 11 via P_inv1 and P_inv2, if they are provided in the circuit. Hereafter, we will explain assuming that there are four measurement points, P_S1, P_S2, P_inv1, and P_inv2, provided in the circuit.

[0036] The four elements Qinv_A, Qinv_B, Qinv_C, and Qinv_D are each controlled by the gate signal voltage indicated by the arrow in the diagram. When a voltage is applied to the gate terminals of Qinv_A and Qinv_D, Qinv_A and Qinv_D conduct and the voltage of power supply 46 is output to Vinv (State 1). When a voltage is applied to the gate terminals of Qinv_B and Qinv_D, the voltage of power supply 46 is output to Vinv (State 2). By repeating the output of State 1 and State 2, the DC voltage of power supply 46 is reversed and output as an AC voltage to Vinv.

[0037] Next, a method for modifying and generating a gate signal, which is a control signal, will be explained. As shown in the lower part of Figure 2, the power converter 40 has a phase detector 32 that detects the phase difference φinv between the inverter current Iinv and the inverter voltage Vinv input from the power supply coil 11 to the inverter circuit 13. The power converter 40 also has a PI controller 33 that receives the input of the deviation φdev between the phase difference φinv and the phase command value φtrg at the location indicated by the symbol with Σ inside the circle in the figure, and outputs an adjusted phase amount φout based on that input. In addition, the power converter 40 has a PWM control unit 34 that receives the adjusted phase amount φout as input and generates and outputs a gate signal (indicated as Gate Signal in the figure) of the inverter circuit 13, which is PWM controlled by the adjusted phase amount φout. The calculation of the deviation φdev between the phase difference φinv and the phase command value φtrg, which is performed at the locations indicated by the symbol Σ inside the circle in the figure, can be alternatively performed by inputting the phase difference φinv and the phase command value φtrg into the PI controller 33 and having the PI controller 33 perform the calculation.

[0038] To output the gate signal described above, the phase detector 32, followed by the deviation calculation, and the control by the PI controller 33 and PWM control unit 34 are repeated. In this embodiment, generally, different gate signals are output in succession to drive the inverter circuit 13. To generate the required gate signal, the time for gate signal generation by the phase detector 32, followed by the deviation calculation, and the PI controller 33 and PWM control unit 34 may be changed as appropriate.

[0039] When power is output through the rectifier 23, the current Iarc flowing out of the rectifier 23 most directly reflects the power supplied to the outside in the power converter 40. The inverter current Iinv and inverter voltage Vinv, which reflect the change in the current Iarc, are measured, and a gate signal is generated based on these changes, and the inverter circuit 13 is driven by this gate signal. In the above feedback control, the gate signal is modified so that the phase difference φinv between the inverter current Iinv and inverter voltage Vinv input from the power supply coil 11 to the inverter circuit 13 is greater than or equal to a predetermined value that ensures sufficient current during ZVS, and is as small as possible. When it is desired to output the desired power under these conditions, the power converter 40 reduces conduction loss in the inverter circuit 13 compared to when the inverter circuit is controlled independently, resulting in higher efficiency and avoidance of high noise factors. The predetermined value that ensures sufficient current during ZVS can be appropriately set according to the components that make up the power converter 40.

[0040] In the case where the power converter 40 does not have a rectifier 23, the power supplied to the outside is most directly reflected in the power converter 40 by the current value flowing through the power supply system 40VA and the voltage values ​​measured by P_arc1 and P_arc2. The same effect can be obtained by controlling the phase difference φinv between the inverter current Iinv and the inverter voltage Vinv, which are affected by these current and voltage values, in the same manner as described above.

[0041] In addition, the power converter 40 makes it easy to generate a gate signal that results in a desired current value during ZVS by PI control of the phase difference φinv between the inverter current Iinv and the inverter voltage Vinv, and the deviation between that and the phase command value φtrg. As a result, operation with minimized conduction loss becomes possible.

[0042] The phase detector 32 receives the inverter current Iinv and the inverter voltage Vinv as inputs. The PI controller 33 receives the phase command value φtrg and the deviation of the phase difference φinv as inputs. These inputs are received via conductive wires connected to the power supply coil 11, and the gate signal may be transmitted to the inverter circuit 13 via the conductive wires. Alternatively, all or part of the components in the above configuration, as shown in the lower part of Figure 2, may not be physically connected to the power converter 40, and communication between the input to and output from these components and the power converter 40 may be performed by wireless communication.

[0043] Figure 4 shows how conduction loss decreases in this embodiment when the power supply 46 is a DC power supply. The top row of Figure 4 shows the inverter voltage Vinv before the gate signal correction, and the second row shows the waveforms of the inverter current Iinv before and after the fluctuation. The inverter current Iinv before the fluctuation is shown as a dashed line, and the inverter current Iinv after the fluctuation is shown as a solid line. As shown in the figure, before the fluctuation, when the value of the inverter voltage Vinv rises from zero to a predetermined positive value, the value of the inverter current Iinv is zero. After the fluctuation, a state occurs where the inverter current Iinv is negative when the inverter voltage Vinv is positive, and conduction loss occurs as long as this state continues, so the conduction loss increases compared to before the fluctuation of the inverter current Iinv.

[0044] The third row from the top of Figure 4 shows the inverter voltage Vinv after the gate signal has been corrected, and the bottom row of Figure 4 shows the inverter current Iinv after the variation shown in the second row of Figure 4. The timing at which the inverter voltage Vinv rises from zero to a predetermined positive value is delayed in the third row of Figure 4 compared to the top row of Figure 4, which reduces the section in which conduction loss occurs as shown in the second row of Figure 4.

[0045] (Embodiment 2) The power converter shown in Figure 1 is an additional component to the power converter 40 shown in Figure 3. The inverter circuit 13 of the power supply system GA is electrically connected to the DC-DC converter circuit 14, and the DC-DC converter circuit 14 is electrically connected to the PFC (Power Factor Correction) circuit 15. An AC power supply 16 is electrically connected to the PFC circuit 15. The rectifier 23 of the power output system VA is electrically connected to the power supply resonant circuit 22, and the power supply resonant circuit 22 is electrically connected to the power supply coil 21. A smoothing capacitor Cr is connected in parallel to the rectifier 23, and then the battery 24 is electrically connected to it.

[0046] Let's further explain the power supply system GA. The DC-DC converter circuit 14 allows the voltage input from the PFC circuit 15 to be broadened and input to the inverter circuit 13. The AC power supply 16 can be replaced with a DC power supply, and if a DC power supply is used, it is possible to have a configuration without one or both of the PFC circuit 15 and the DC-DC converter circuit 14.

[0047] The power supply side resonant circuit 12 and the power output side resonant circuit 22 enable power transmission using a magnetic field resonance method. Specifically, the DS (Double Sided)-LCC method and the SS method are envisioned as the methods for the power supply side resonant circuit 12 and the power output side resonant circuit 22. In the DS-LCC method, the power supply side resonant circuit 12 is a circuit consisting of a capacitor and a coil connected in series with the power supply side coil 11, as well as a capacitor connected in parallel, and the power output side resonant circuit 22 is a similar circuit with respect to the power output side coil 21. In the SS method, the power supply side resonant circuit 12 is a capacitor connected in series with the power supply side coil 11, and the power output side resonant circuit 22 is a capacitor connected in series with the power output side coil 21.

[0048] Power transmission from the power supply system GA to the power output system VA is performed using a magnetic field resonance method. The distance between the power output coil 21 and the power supply coil 11 during power transmission may be appropriately changed according to the application of the power converted by this invention. Ideally, the power output coil 21 should be in the optimal position for power transmission relative to the power supply coil 11, that is, the position where the transmitted power is maximized when the position changes, but power transmission can still be performed even if it deviates from this optimal position. In the above magnetic field resonance method, the reduction in transmitted power due to the above positional deviation can be suppressed by appropriately configuring the resonant circuit. The presence of a smoothing capacitor Cr enables smoothing of the current and, consequently, the power supplied from the rectifier 23 to the battery 24. The battery 24 is an on-board battery when the power conversion system supplies power to an electric vehicle, and some kind of energy storage device when supplying power to something other than an electric vehicle.

[0049] The effects of this embodiment will be explained with reference to Figures 1 and 2. In this embodiment, it is essential to measure the inverter voltage Vinv input from the power supply side resonant circuit 12 to the inverter circuit 13, and the inverter current Iinv flowing from the power supply side resonant circuit 12 to the inverter circuit 13. Measuring other current and voltage values ​​in the circuit is optional.

[0050] The inverter current Iinv and inverter voltage Vinv, which reflect the change in the current Iarc flowing from the rectifier 23 near the battery 24, are measured, and a gate signal is generated based on this change, and the inverter circuit 13 is driven by this gate signal. In the above feedback control, the gate signal is modified so that the phase difference φinv between the inverter current Iinv and inverter voltage Vinv input from the power supply coil 11 to the inverter circuit 13 is greater than or equal to a predetermined value that ensures sufficient current during ZVS, and is as small as possible. Specifically, the phase difference φinv between the inverter current Iinv and inverter voltage Vinv is detected by the phase detector 32, the deviation between this phase difference φinv and the phase command value φtrg is input to the PI controller 33, the phase amount φout output by the PI controller 33 is adjusted and input to the PWM control unit 34, the PWM control unit 34 generates a gate signal for the inverter circuit 13 with the phase amount φout corrected, and the inverter circuit 13 is driven by this gate signal. As a result, even if a phase difference φinv occurs between the inverter current Iinv and the inverter voltage Vinv due to a change in the current Iarc flowing out of the rectifier 23, the inverter circuit 13 can be driven by the corrected gate signal. Furthermore, PI control makes it easy to maintain φinv at a constant value. Consequently, as shown in Figure 4, conduction loss during ZVS can be reduced, leading to higher efficiency and avoidance of factors that increase noise. [Explanation of Symbols]

[0051] 11 Power supply coil 12 Power supply side resonant circuit 13 Inverter Circuit 14. DC-DC converter circuit 15 PFC circuit 16 AC power supply 21 Power output side coil 22 Power output side resonant circuit 23 Rectifier 24 batteries 32 Phase detector 33 PI controller 34 PWM control unit 46 Power supply

Claims

1. In a power conversion device that transmits power from a power supply coil to a power output coil in a non-contact manner, thereby outputting power through a power output resonant circuit and a rectifier, A power supply side resonant circuit electrically connected to the power supply side coil, An inverter circuit electrically connected to the power supply side resonant circuit, A PFC circuit electrically connected to the inverter circuit, An AC power supply electrically connected to the PFC circuit, It has, When outputting the aforementioned power, a phase detector is provided to detect the phase difference between the inverter current and the inverter voltage input from the power supply side resonant circuit to the inverter circuit, which is caused by a change in the control amount of the rectifier. A PI controller inputs the phase difference detected by the phase detector and the deviation of the phase command value, A PWM control unit receives the phase amount adjusted and output by the PI controller and generates a gate signal for the inverter with the phase amount corrected, It has, A power conversion device characterized by driving the inverter circuit with the gate signal generated by the PWM control unit.

2. In claim 1, A DC-DC converter circuit is arranged between the inverter circuit and the PFC circuit. A power conversion device characterized in that the DC-DC converter circuit is electrically connected to the inverter circuit, and the PFC circuit is electrically connected to the DC-DC converter circuit.

3. In claim 1 or 2, A power converter characterized in that the vehicle's battery is charged when the power converter outputs the power.

4. In a power conversion device that outputs power through a rectifier by transmitting power from a power supply coil to a power output coil in a non-contact manner, An inverter circuit electrically connected to the power supply coil, An AC power supply electrically connected to the inverter circuit, It has, A power conversion device characterized in that, when outputting the aforementioned power, the inverter circuit is driven by a gate signal generated based on a change in the control amount of the rectifier.

5. In claim 4, The system further includes a phase detector that detects the phase difference between the inverter current input from the power supply coil to the inverter circuit and the inverter voltage, which is caused by a change in the control amount of the rectifier. A power conversion device characterized by driving the inverter circuit with a gate signal generated based on the phase difference.

6. In claim 5, A power supply side resonant circuit is disposed between the power supply side coil and the inverter circuit and is electrically connected to both, A power output side resonant circuit is disposed between the power output side coil and the rectifier and electrically connected to both, A power conversion device characterized by further having the following.

7. In claim 5 or 6, The system further includes a PI controller that, upon input of the difference between the phase difference detected by the phase detector and the phase command value, outputs a PI-controlled phase quantity. A power converter characterized in that the gate signal generated based on the phase difference is a gate signal output by the PWM control unit, which was generated based on the phase amount.

8. A control method for the inverter circuit of a power converter that outputs power through a power output resonant circuit and a rectifier by transmitting power in a non-contact manner from a power supply coil electrically connected to an AC power source, a PFC circuit, an inverter circuit, and a power supply side resonant circuit to a power output side coil, When outputting the aforementioned power, the phase difference between the inverter current and the inverter voltage input from the power supply side resonant circuit to the inverter circuit, which is caused by a change in the control amount of the rectifier, is detected. The phase amount is adjusted by PI control based on the phase difference and the deviation of the phase command value. The gate signal of the inverter is generated by PWM control based on the aforementioned phase amount. A method for controlling the inverter of a power conversion device, characterized in that the inverter circuit is driven by the gate signal.

9. In claim 8, A method for controlling the inverter of a power converter, characterized in that the onboard battery is charged when the power converter outputs the power.

10. A control method for the inverter circuit of a power conversion device that outputs power through a rectifier by transmitting power in a non-contact manner from a power supply coil electrically connected to an AC power source and an inverter circuit to a power output coil, When outputting the aforementioned power, a gate signal is generated based on the change in the control amount of the rectifier. A method for controlling the inverter of a power conversion device, characterized in that the inverter circuit is driven by the gate signal.

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