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

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, thereby outputting power through a rectifier 23, and comprises an inverter circuit 13 electrically connected to the power supply coil 11, an AC power supply 16 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. The phase detector 32 detects the phase difference between the inverter current and the inverter voltage input from the power output side resonant circuit 12 to the inverter circuit 13, and the conversion unit 30 determines the peak value i of the inverter current within a predetermined period. m Obtain the peak value i m This power conversion device is characterized by calculating a phase command value φtrg from a current command value Itrg, and driving the inverter circuit 13 with a gate signal of the inverter circuit 13 generated based on the phase difference and the phase command value φtrg.

Description

[Technical Field]

[0001] This invention relates to a power converter, a control method for the inverter of a power converter, and a control program. [Background technology]

[0002] Conventional power conversion devices, unlike the circuit configuration shown in Figure 1, do not include a DC-DC converter. Instead, they adjust the power supply by independently controlling the conduction angle αinv of the switch in the inverter circuit 13 and the conduction angle αarc of the switch in the rectifier 23. Related technology is disclosed in Patent Document 1.

[0003] Since the rectifier 23 is positioned directly in front of the external power supply unit, the control amount of the rectifier 23 most directly reflects the power supplied externally within the system. 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 is also affected and operates accordingly. When the phase difference φinv increases, the conduction loss in the inverter circuit 13 increases, and efficiency deteriorates. Furthermore, when the phase difference φinv falls below a predetermined value, the current during ZVS (Zero Voltage Switching) becomes insufficient, resulting in a hard-switched state, which can lead to increased harmonic noise and, depending on the condition, damage to the FET device.

[0004] Therefore, there is a need for a control method that corrects the phase of the inverter circuit 13 and operates in coordination with the operation of the rectifier 23 to improve efficiency and avoid factors that increase noise. [Prior art documents] [Patent Documents]

[0005] [Patent Document 1] Japanese Patent Publication No. 2015-208150 [Overview of the project] [Problems that the invention aims to solve]

[0006] Various aspects of the present invention aim to provide a power converter, a control method for the inverter of a power converter, and a control program that 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. The peak value i of the inverter current m A peak detector that acquires the data, The aforementioned peak value i m A conversion unit that converts the current command value Itrg to the phase command value φtrg using the following equation 1, A PI controller that inputs the difference between the phase difference detected by the phase detector and the phase command value φtrg converted by the conversion unit, 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. [Claims]

[0009] According to the power conversion device of the above [1] according to one aspect of the present invention, 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 inverter current input to the inverter circuit is measured, and the peak value i of the inverter current m is acquired, the peak value i m and the current command value Itrg are converted into a phase command value φtrg, the deviation between the detected phase difference and the converted phase command value φtrg is input to a PI controller, the phase amount adjusted and output by the PI controller is input to a PWM control unit, the PWM control unit generates a gate signal for the inverter, and the gate signal drives the inverter circuit. The reason for measuring and controlling the inverter current in this manner is to keep the inverter current constant during ZVS and minimize conduction loss. In addition, even if a phase difference between the inverter current and the inverter voltage input to the independently controlled inverter circuit occurs due to a change in the control amount of the independently controlled rectifier, the inverter circuit can be driven by the gate signal generated by correcting the phase amount, which is obtained by adjusting the deviation between this phase difference and the phase command value φtrg with the PI controller, in the PWM control unit. By operating the inverter circuit in coordination with the operation of the rectifier in this manner, an increase in the phase difference can be suppressed, conduction loss in the inverter circuit is reduced, higher efficiency is achieved, and factors causing increased noise can be avoided. Specifically, the output of power transmitted from the power supply-side coil to the power output-side coil is performed through a rectifier. In the above feedback control, the gate signal is corrected such that the phase difference between the inverter current and the inverter voltage input from the power supply-side resonant circuit to the inverter circuit is equal to or greater than a predetermined value at which the current during ZVS does not become insufficient, and is as small as possible. In order to output desired power under this situation, the conduction loss in the inverter circuit is reduced, higher efficiency is achieved, and factors causing increased noise can be avoided, as compared with the case where the inverter circuit is independently controlled in the power converter according to the above [1]. In addition, according to the power converter of the above [1], it becomes easy to solve the problem of the method of controlling the inverter circuit by performing PI control on the deviation between the phase difference of the inverter current and the inverter voltage and the phase command value φtrg. This problem refers to that when the phase difference is controlled to be constant based on the phase command value φtrg and the peak value of the inverter current changes, the current during ZVS is not constant, and when the peak value of the inverter current increases, the conduction loss increases. Factors causing fluctuations in the inverter current include changes in the degree of coupling between the power supply-side coil and the power output-side coil, changes in the applied voltage of the FET, and changes in the ambient temperature. With respect to the above problem, by acquiring the peak value of the inverter current, it becomes possible to capture changes in the inverter current caused by these fluctuation factors. Further, by setting the current command value Itrg in Equation 1, converting it to φtrg, and then performing PI control, it is possible to operate the gate signal at a desired current value during ZVS, and operation in a state where conduction loss is minimized becomes possible.

[0010] [2] In the above [1], A DC-DC converter circuit is disposed between the inverter circuit and the PFC circuit, The power converter, wherein 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.

[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, A conversion unit electrically connected to the inverter circuit, A phase detector electrically connected to the inverter circuit, It has, The phase detector detects the phase difference between the inverter current and the inverter voltage input from the power output side resonant circuit to the inverter circuit, and the conversion unit determines the peak value i of the inverter current within a predetermined period. m Obtain the peak value i m A power conversion device characterized by calculating a phase command value φtrg from a current command value Itrg, and driving the inverter circuit with a gate signal of the inverter circuit generated based on the phase difference and the phase command value φtrg.

[0014] According to the power conversion device described in [4] above in one aspect of the present invention, the phase difference between the inverter current and the inverter voltage based on the change in the control amount of the rectifier adjacent to the power output is detected, and a gate signal for the inverter circuit is generated based on this to drive the inverter circuit. As a result, conduction loss in the inverter circuit is reduced, and high efficiency and factors that increase noise can be avoided. In addition, the peak value i of the inverter current within a predetermined periodm Obtain the peak value i m The phase command value φtrg is calculated from the current command value Itrg, and the gate signal of the inverter circuit is generated based on the above phase difference and the phase command value φtrg.

[0015] [5] In the above [4], The inverter circuit further comprises a PWM control unit electrically connected to the aforementioned inverter circuit. The conversion unit is electrically connected to the inverter circuit via the PWM control unit. The phase detector is electrically connected to the inverter circuit via the PWM control unit. The phase command value φtrg is calculated using the following equation 1: The power conversion device is characterized in that the gate signal of the inverter circuit is generated by the PWM control unit in accordance with the phase difference which is brought close to the calculated phase command value φtrg, and the inverter circuit is driven by the gate signal.

number

[0016] According to the power conversion device described in [5] above in one aspect of the present invention, the device further comprises a PWM control unit electrically connected to an inverter circuit, a conversion unit electrically connected to the inverter circuit via the PWM control unit, a phase detector electrically connected to the inverter circuit via the PWM control unit, the calculation of the phase command value φtrg is performed using Equation 1, the generation of the gate signal of the inverter circuit is performed by the PWM control unit in accordance with the phase difference that is brought closer to the calculated phase command value φtrg, and the inverter circuit is driven by the gate signal. Although conduction loss increases as the phase difference increases, in this configuration the phase difference is determined based on the current command value, so phase adjustment in accordance with changes in inverter current is possible and conduction loss can be minimized.

[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 characterized by further having the following.

[0018] [7] In the above [5], A power conversion device characterized by having a PI controller that, upon input of the phase difference detected by the phase detector and the phase command value calculated by the conversion unit, calculates the deviation between the input signals and outputs a PI-controlled adjusted phase amount which is the phase difference brought closer to the phase command value.

[0019] According to the power conversion device described in [7] above in one aspect of the present invention, the PI controller on the power supply side receives input of the deviation between the phase difference detected by the phase detector and the phase command value calculated by the conversion unit, and outputs a phase amount adjusted by PI control. Even if the phase difference increases or decreases due to the aforementioned fluctuating factors, PI control can cause it to converge to the desired phase command value.

[0020] [8] In any one of the above paragraphs [5] to [7], It further includes a peak detector, The power conversion device is characterized in that the acquisition of the peak value of the inverter current is performed by the peak detector measuring the inverter current input to the inverter circuit.

[0021] [9] 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 supply, 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. measuring an inverter current input to the inverter circuit, obtaining the measured peak value i of the inverter current m , converting the peak value i m and a current command value Itrg into a phase command value φtrg using the following Equation 1, adjusting a phase amount by PI control based on a deviation between the phase difference and the converted phase command value φtrg, generating a gate signal of the inverter by PWM control based on the phase amount, and driving the inverter circuit with the gate signal. A control method for an inverter of a power conversion device, characterized by the above features. [Equation]

[0022] According to the control method for an inverter of a power conversion device described in the above [9] according to one aspect of the present invention, the same effects as those of the power conversion device of the above [1] can be expected.

[0023]

[10] In the above [9], the power conversion device outputs the power, whereby an in-vehicle battery is charged. A control method for an inverter of a power conversion device, characterized by the above features.

[0024]

[11] A power conversion device that outputs power through a rectifier by transmitting power from a power supply side coil to a power output side coil in a non-contact state, comprising: an inverter circuit electrically connected to the power supply side coil; an AC power supply electrically connected to the inverter circuit; a conversion unit electrically connected to the inverter circuit; a phase detector electrically connected to the inverter circuit; and detecting a phase difference between an inverter current and an inverter voltage input from the power output side resonance circuit to the inverter circuit, and determining a peak value i of the inverter current within a predetermined period m is obtained, and the peak value i mA method for controlling the inverter of a power converter, characterized by calculating a phase command value φtrg from a current command value Itrg, generating a gate signal for the inverter circuit based on the phase difference and the phase command value φtrg, and driving the inverter circuit with the gate signal.

[0025] According to the inverter control method of the power converter described in

[11] above in one aspect of the present invention, the phase difference between the inverter current and the inverter voltage based on a change in the control amount of a rectifier adjacent to the power output is detected, and a gate signal for the inverter circuit is generated based on this to drive the inverter circuit. Therefore, even if the operating state of the rectifier changes, conduction loss in the inverter circuit can be reduced, and high efficiency and high noise factors can be avoided. In addition, the peak value i of the inverter current within a predetermined period m Obtain the peak value i m The phase command value φtrg is calculated from the current command value Itrg, and the gate signal of the inverter circuit is generated based on the above phase difference and the phase command value φtrg.

[0026]

[12] The power converter described in [1] above has a control program that implements multiple functions, The aforementioned multiple functions are, (a) A function to measure the inverter current and inverter voltage input from the power supply side resonant circuit to the inverter circuit, (b) A function for detecting the phase difference between the inverter current and the inverter voltage, The peak value i of the inverter current measured in the function (a) above m The function to obtain (d) and The peak value i obtained in the function (d) described above m (e) A function that calculates the phase command value φtrg from the current command value Itrg using the following equation 1. Function (f) to calculate the deviation between the phase difference and the phase command value φtrg and output it to the PI controller, The PI controller has a function (g) of outputting an adjusted phase amount, which is the phase difference that has been brought closer to the phase command value φtrg by PI control, to the PWM control unit, The PWM control unit has a function (h) that generates the gate signal of the inverter in accordance with the adjusted phase amount, (i) A function to drive the inverter circuit with the generated gate signal, A power conversion device characterized by having the following features.

number

[0027] According to the power conversion device described in

[12] above in one aspect of the present invention, by having a control program that realizes the above functions (a), (b), (d) to (i), control based on feedback from a rectifier adjacent to the power output section to the inverter circuit is possible. Compared to independent control of the inverter circuit, this control enables control in response to fluctuating factors, reduces conduction loss in the inverter circuit, and improves efficiency and avoids factors that increase noise.

[0028]

[13] A rectifier electrically connected to a power output coil that receives power from a power supply coil in a non-contact manner, and which supplies the rectified current and voltage of the input current to the outside, An inverter circuit that receives an inverter voltage and inverter current input that reflects the output from the rectifier, transmitted from the power output coil to the power supply coil via a power supply side resonant circuit, and receives and converts an AC voltage and AC current input, and outputs it to the power supply coil via the electrically connected power output side resonant circuit, A PWM control unit connected to the inverter circuit, A PI controller connected to the PWM control unit, A phase detector connected to the PI controller, A conversion unit connected to the PI controller, A program for controlling a power converter having, (a) a step of measuring the inverter current and inverter voltage input from the power supply side resonant circuit to the inverter circuit, (b) a step in which the phase difference between the inverter current and the inverter voltage is detected by the phase detector, The peak value i of the inverter current measured in step (a) above m Step (d) to obtain, The peak value i obtained in step (d) m (e) The conversion unit calculates the phase command value φtrg using the following equation 1 from the value of the current command value Itrg. Step (f) calculates the difference between the phase difference and the phase command value φtrg and outputs it to the PI controller, (g) The PI controller outputs the PI-controlled adjusted phase amount, which is the phase difference that has been brought close to the phase command value φtrg, to the PWM control unit. Step (h) of generating the gate signal of the inverter in the PWM control unit in accordance with the adjusted phase amount, Step (i) of driving the inverter circuit with the generated gate signal, A control program that causes a computer to execute something.

number

[0029] In a system using the control program described in

[13] above according to one aspect of the present invention, power is transmitted from one power output coil to the other. For this reason, the output from the rectifier is reflected in step (a) of measuring the inverter current and inverter voltage input from the power output resonant circuit to the inverter circuit. Subsequently, the phase difference is detected by step (b) of detecting the phase difference between the inverter current and the inverter voltage. In parallel with step (b), the peak value of the inverter current measured in step (a) is obtained (step (d)), and the phase command value is calculated from the obtained peak value and the current command value using Equation 1 (step (e)). The deviation between the phase difference and the phase command value obtained by the above procedure is calculated and output to the PI controller (step (f)), and the PI controller outputs the PI-adjusted phase amount, which is the phase difference brought closer to the phase command value, to the PWM control unit (step (g)). The PWM control unit generates a gate signal for the inverter circuit corresponding to the adjusted phase amount (step (h)), and the PWM control unit drives the inverter circuit with the gate signal generated corresponding to the adjusted phase amount (step (i)). As a result, control can be performed based on feedback from the rectifier, which is close to the external power supply unit, to the inverter circuit. Compared to independent control of the inverter circuit, this control allows for control in response to fluctuating factors, reduces conduction losses in the inverter circuit, and improves efficiency and avoids factors that increase noise. [Effects of the Invention]

[0030] According to various aspects of the present invention, it is possible to provide a power conversion device that achieves high efficiency by reducing conduction loss and avoids factors that increase noise, as well as a control method and control program for its inverter. [Brief explanation of the drawing]

[0031] [Figure 1] This is a circuit diagram illustrating a power conversion device according to one aspect of the present invention. [Figure 2] Figure 1 shows a detailed circuit diagram and schematic diagram illustrating the control of the power output side inverter. [Figure 3] This is a circuit diagram illustrating a power conversion device according to one aspect of the present invention. [Figure 4] Figure 2 is a schematic diagram showing the results of the inverter control. [Figure 5] This flowchart illustrates a program that reduces conduction losses by controlling the power output inverter shown in Figure 2. [Modes for carrying out the invention]

[0032] 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.

[0033] 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 schematic diagram showing the result of controlling the inverter shown in Figure 2. Figure 5 is a flowchart illustrating a program that reduces conduction loss by controlling the power output side inverter shown in Figure 2.

[0034] 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.

[0035] 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 may be used. In this case, AC power is output to the outside of the power converter 40.

[0036] 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.

[0037] 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.

[0038] As the phase difference φarc between the voltage Varc applied from the rectifier 23 to the power output coil 21 and the current Iarc flowing from the rectifier 23 to the power output coil 21 changes, the phase difference φinv of the inverter circuit 13 is also affected and fluctuates. As φinv increases, the conduction loss of the switching elements constituting the inverter circuit increases.

[0039] By measuring the inverter voltage Vinv using P_inv1 and P_inv2, and the inverter current Iinv using either P_inv1 or P_inv2, the following feedback control can be achieved.

[0040] 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 following explanation assumes that four measurement points, P_S1, P_S2, P_inv1, and P_inv2, are provided in the circuit.

[0041] The four elements Qinv_A, Qinv_B, Qinv_C, and Qinv_D are each controlled by the voltage of the gate signal 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 outputs of State 1 and State 2, the DC voltage of power supply 46 is output to Vinv as an AC voltage. By repeating the outputs of State 1 and State 2, the DC voltage of power supply 46 is reversed in polarity and output to Vinv as an AC voltage.

[0042] Next, a method for modifying and generating the gate signal, which is a control signal, will be described. As shown in the middle section 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. In addition, the power converter 40 also detects the peak value i of the inverter current Iinv within a predetermined period. m A peak detector 31 that acquires the peak value i m The power converter 40 has a conversion unit that converts the current command value itrg into a phase command value φtrg (this conversion unit is represented in the figure by a symbol with the words "Ito φ Conversion" inside a rectangle). The power converter 40 further has a calculation unit that calculates the deviation φdev between the phase difference φinv and the phase command value φtrg detected by the phase detector 32 (this calculation unit is represented in the figure by a symbol with the letters Σ inside a circle), and has a PI controller 33 that outputs a PI-controlled phase amount φout when the deviation φdev is input. The power converter 40 also has a PWM control unit 34 that, when the phase amount φout is input, generates and outputs a PWM-controlled gate signal (labeled "Gate Signal" in the figure) of an inverter circuit 13 as shown in detail in the upper part of Figure 2. The calculation of the deviation φdev between the phase difference φinv and the phase command value φtrg, which is performed in the calculation unit, may be performed by the PI controller 33 by inputting the phase difference φinv and the phase command value φtrg to the PI controller 33.

[0043] To output the gate signal described above, the control by the phase detector 32, peak detector 31, conversion unit, calculation unit, PI controller 33, and PWM control unit 34 is repeated. The predetermined period for the peak detector 31 may be a fixed length of time corresponding to the time length of one cycle of the repeated control. Alternatively, the peak value i may be a variable length, such as the time at which the peak value appears can be specified. mThis can be the time during which the signal can be obtained. 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 the phase detector 32 and the subsequent deviation calculation and gate signal generation by the PI controller 33 and PWM control unit 34 may be changed as appropriate.

[0044] When power is output through the rectifier 23, the current Iarc, which is the control variable 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 no current is insufficient 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, improves efficiency, and avoids factors that increase noise, compared to when the inverter circuit is controlled independently. The predetermined value that ensures no current is insufficient during ZVS can be set appropriately according to the components that make up the power converter 40.

[0045] 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.

[0046] In addition, the power converter 40 makes it easier to solve the problems associated with the method of controlling the inverter circuit 13 by PI control of the deviation between the phase difference φinv between the inverter current Iinv and the inverter voltage Vinv and the phase command value φtrg. This problem is that when the phase difference φinv is controlled to be constant based on the phase command value φtrg, if the amplitude of the inverter current changes, the current at ZVS will not be constant, and the conduction loss will increase as the amplitude of the inverter current increases. Factors causing fluctuations in the inverter current include changes in the coupling degree between the power supply coil and the power output coil, changes in the applied voltage of the FET (Field Effect Transistor), and changes in ambient temperature. To address the above problem, as shown in the middle diagram of Figure 2, the peak value i of the inverter current Iinv is... m By acquiring this data, it becomes possible to capture the changes in the inverter current Iinv caused by these fluctuating factors. Furthermore, by setting the current command value itrg and converting it to φtrg before performing PI control, it becomes possible to generate the gate signal indicated by the arrow in the upper part of Figure 2 so that the desired current value is obtained during ZVS. As a result, operation with minimized conduction loss becomes possible.

[0047] The phase detector 32 receives the inverter current Iinv and inverter voltage Vinv as inputs, the peak detector 31 receives the inverter current Iinv as input, and the conversion unit receives the current command value itrg as input. These inputs are received via conductive wires connected to the power supply coil 11, and the generated gate signals 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 middle diagram 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.

[0048] The conversion formula shown in the lower part of Figure 2 is not limited to the use of the conversion formula, but for example, if the inverter current Iinv within one cycle is at its minimum value i mOther methods can be used to ensure that the phase difference φinv during ZVS is greater than or equal to a predetermined value, such as setting the phase after a predetermined time from the time taken to the phase command value φtrg. Here, the predetermined time is the time during ZVS that makes the phase difference φinv greater than or equal to a predetermined value, and the predetermined value of the phase difference φinv is mainly determined by the components that make up the circuit.

[0049] Figure 4 shows how conduction loss is reduced 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 correction of the gate signal, and the second row shows the waveform of the inverter current Iinv corresponding to that inverter voltage Vinv. As shown in the figure, when the value of the inverter voltage Vinv rises from zero to a predetermined positive value, the value of the inverter current Iinv is negative. This negative value is far from the current command value itrg, and therefore it is the value at a point where the phase difference is greater than the phase command value φtrg, which is the phase difference between the point where the value of the inverter current Iinv is zero and the point where the current command value itrg is. Conduction loss occurs as long as the inverter voltage Vinv is positive and the inverter current Iinv is negative.

[0050] In Figure 4, conduction loss occurs in the interval from the point when the inverter voltage reverses from negative to positive until the inverter current Iinv reverses from negative to positive. Before implementation of this embodiment, as shown in Figure 4(a), the operating waveform is when the gate signal is not controlled, and the conduction loss interval increases or decreases with changes in current phase. As shown after implementation of this embodiment in Figure 4(b), by controlling the gate signal, the timing at which the inverter voltage becomes positive can be synchronized with the current command value itrg, and conduction loss can be reduced while keeping the current constant during ZVS.

[0051] (Embodiment 2)

[0052] 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 14, and the DC-DC converter 14 is electrically connected to the PFC (Power Factor Correction) circuit 15. The 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 the battery 24 is electrically connected to it.

[0053] Let's further explain the power supply system GA. The DC-DC converter 14 makes it possible to broaden the voltage input from the PFC circuit 15 and input it 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 14.

[0054] 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.

[0055] 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, i.e., the position where the transmitted power is maximized, but power transmission can still be performed even if it is deviated 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 supplying power to an electric vehicle by the power conversion device, and some kind of energy storage device when supplying power to something other than an electric vehicle.

[0056] 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.

[0057] In this embodiment, the phase difference φinv between the inverter current Iinv and the inverter voltage Vinv input from the power supply side resonant circuit 12 to the inverter circuit 13 is detected, which reflects the change in current Iarc, a control amount of the rectifier 23 near the battery 24. Independently, the inverter current Iinv input to the inverter circuit 13 is measured, and the peak value i of that inverter current Iinv is detected. m Obtain its peak value i mThe current command value itrg is converted to a phase command value φtrg. Then, the difference between the detected phase difference φinv and the converted phase command value φtrg is input to the PI controller 33, and the phase amount φout, which is adjusted and output by the PI controller 33, is input to the PWM control unit 34. The PWM control unit 34 generates the gate signal for the inverter, and this gate signal drives the inverter circuit 13. The inverter current Iinv is measured and controlled in this way in order to keep the inverter current Iinv constant during ZVS and minimize conduction loss. In this embodiment, even if a phase difference φinv occurs between the inverter current Iinv and the inverter voltage Vinv input to the inverter circuit 13 due to a change in the control amount of the rectifier 23, the inverter circuit 13 can be driven by the gate signal generated by correcting the phase amount φout, which is adjusted by the PI controller 34 based on the difference between this phase difference φinv and the phase command value φtrg, in the PWM control unit 35. By operating the inverter circuit 13 in coordination with the operation of the rectifier 23 in this way, the phase difference φ inv This suppresses the increase in noise, and as shown in Figure 4, the conduction loss in the inverter circuit 13 is reduced, leading to higher efficiency and avoidance of noise-generating factors.

[0058] The effects of the operation of the inverter circuit 13 in coordination with the operation of the rectifier 23 described above will be explained in detail below. The power output transmitted from the power supply coil 11 to the power output coil 21 is performed through the rectifier 23. In the above feedback control, the gate signal is modified so that the phase difference φinv between the inverter current Iinv and the inverter voltage Vinv input from the power supply resonant circuit 12 to the inverter circuit 13 is greater than or equal to a predetermined value that ensures no current is insufficient during ZVS, and is as small as possible. In order to output the desired power under these conditions, the power converter shown in Figure 1 reduces conduction loss in the inverter circuit 13, improves efficiency, and avoids factors that increase noise, compared to the case where the inverter circuit is controlled independently. In addition, the power converter shown in Figure 1 makes it easier to solve the problems of the method of controlling the inverter circuit 13 by PI control of the deviation between the phase difference φinv between the inverter current Iinv and the inverter voltage Vinv and the phase command value φtrg. This problem arises when the phase difference φinv is controlled to be constant based on the phase command value φtrg. If the amplitude of the inverter current changes, the current during ZVS (Zero Voltage Versus) will not be constant, and the conduction loss will increase as the amplitude of the inverter current increases. Factors that cause fluctuations in the inverter current include changes in the coupling degree between the power supply coil and the power output coil, changes in the applied voltage to the FET, and changes in ambient temperature. To address this problem, as shown in the middle diagram of Figure 2, it becomes possible to capture the changes in the inverter current Iinv caused by these fluctuation factors by acquiring the peak value of the inverter current. Furthermore, by setting the current command value Itrg in the equation in the lower part of Figure 2, converting it to φtrg, and then performing PI (Pulse Input) control, it becomes possible to operate the gate signal with a desired current value during ZVS, enabling operation with minimized conduction loss.

[0059] Furthermore, according to this embodiment, the DC-DC converter circuit 14, which is positioned between the inverter circuit 13 and the PFC circuit 15 and electrically connected to both, can widen the operating range of the voltage input to the inverter circuit 13.

[0060] Furthermore, the phase difference φinv between the inverter current Iinv and the inverter voltage Vinv, based on the change in the control amount of the rectifier 23 located near the power output, is detected, and the gate signal of the inverter circuit 23 is generated based on this to drive the inverter circuit 23. Therefore, conduction loss in the inverter circuit 23 is reduced, leading to higher efficiency and avoidance of factors contributing to high noise. In addition, the peak value i of the inverter current within a predetermined period is also detected. m Obtain the peak value i m The phase command value φtrg is calculated from the current command value itrg, and the gate signal of the inverter circuit 23 is generated based on the above phase difference φinv and phase command value φtrg.

[0061] Furthermore, the inverter circuit 23 has a PWM control unit 34 that is electrically connected to it. The conversion unit is electrically connected to the inverter circuit 13 via the PWM control unit 34, and the phase detector 31 is electrically connected to the inverter circuit 13 via the PWM control unit 34. The phase command value φtrg is calculated using the equation in the lower part of Figure 2. The gate signal of the inverter circuit 13 is generated by the PWM control unit 34 in accordance with the phase difference that is brought closer to the calculated phase command value φtrg, and the inverter circuit 13 is driven by the gate signal. Although conduction loss increases as the phase difference φinv increases, in this configuration the phase command value φtrg is determined based on the current command value itrg, so phase adjustment in accordance with changes in the inverter current Iinv is possible and conduction loss can be minimized.

[0062] Furthermore, the PI controller 34 calculates and inputs the deviation φdev between the phase difference φinv detected by the phase detector 32 and the phase command value φtrg calculated by the conversion unit, and outputs the phase amount φout adjusted by PI control. PI control makes it easier to converge to the desired phase command value even when the phase difference φinv increases or decreases due to the aforementioned fluctuation factors.

[0063] Furthermore, in this embodiment, in order to control the inverter circuit 13 of a power converter that outputs power through the power output resonant circuit 22 and rectifier 23 by transmitting power in a non-contact manner from the power supply side coil 11, which is electrically connected to the AC power supply 16, PFC circuit 15, inverter circuit 13, and power supply side resonant circuit 12, to the power output side coil 21, the phase difference φinv between the inverter current Iinv and the inverter voltage Vinv input from the power supply side resonant circuit 12 to the inverter circuit 13, which is caused by the change in the control amount of the rectifier 23 when the above power is output, is detected, the inverter current Iinv input to the inverter circuit 13 is measured, and the peak value i of the measured inverter current Iinv is measured. m Obtain its peak value i m The current command value itrg is converted to a phase command value φtrg according to the formula in the lower part of Figure 2. The phase amount φout is adjusted by PI control based on the deviation between the converted phase command value φtrg and the phase difference φinv. The gate signal of the inverter circuit 13 is generated by PWM control based on the phase amount φout, and the inverter circuit 13 is driven by this gate signal. The inverter current Iinv is measured and controlled in this way to keep the inverter current Iinv constant during ZVS and minimize conduction loss. Furthermore, even if a phase difference φinv occurs between the inverter current Iinv and the inverter voltage Vinv input to the inverter circuit 13 due to a change in the control amount of the rectifier 23, the inverter circuit 13 can be driven by the gate signal generated by correcting the phase amount φout, which is adjusted by the PI controller 34 based on the deviation between this phase difference φinv and the phase command value φtrg, in the PWM control unit 34. By operating the inverter circuit 13 in coordination with the operation of the rectifier 23 in this way, the increase in the phase difference φinv can be suppressed, and as shown in Figure 4, the conduction loss in the inverter circuit 13 is reduced, leading to higher efficiency and avoidance of factors that increase noise.

[0064] The effects of the operation of the inverter circuit 13 in coordination with the operation of the rectifier 23 described above will be explained in detail below. The power output transmitted from the power supply coil 11 to the power output coil 21 is performed through the rectifier 23. In the above feedback control, the gate signal is modified so that the phase difference φinv between the inverter current Iinv and the inverter voltage Vinv input from the power supply resonant circuit 12 to the inverter circuit 13 is greater than or equal to a predetermined value that ensures no current is insufficient during ZVS, and is as small as possible. In order to output the desired power under these conditions, the power conversion device shown in Figure 1 reduces conduction loss in the inverter circuit 13, improves efficiency, and avoids factors that increase noise, compared to the case where the inverter circuit is controlled independently. In addition, the power conversion device shown in Figure 1 makes it easier to solve the problems of the method of controlling the inverter circuit 13 by PI control of the deviation between the phase difference φinv between the inverter current Iinv and the inverter voltage Vinv and the phase command value φtrg. This problem is that when the phase difference φinv is controlled to be constant based on the phase command value φtrg, if the amplitude of the inverter current Iinv changes, the current during ZVS will not be constant, and the conduction loss will increase as the amplitude of the inverter current Iinv increases. Factors that cause fluctuations in the inverter current include changes in the coupling degree between the power supply coil and the power output coil, changes in the applied voltage to the FET, and changes in ambient temperature. To address the above problem, as shown in the middle diagram of Figure 2, the peak value of the inverter current Iinv is i m By acquiring this data, it becomes possible to capture the change in inverter current Iinv caused by these fluctuating factors. Furthermore, by setting the current command value itrg in the lower equation of Figure 2, converting it to φtrg, and then performing PI control, it becomes possible to operate the gate signal with a desired current value during ZVS, enabling operation with minimized conduction losses.

[0065] Furthermore, in this embodiment, the phase difference φinv between the inverter current Iinv and the inverter voltage Vinv, based on the change in the control amount of the rectifier 23 located near the battery 24, is detected, and a gate signal for the inverter circuit 13 is generated based on this to drive the inverter circuit 13. Therefore, even if the operating state of the rectifier 23 changes, conduction loss in the inverter circuit 13 can be reduced, thereby achieving higher efficiency and avoiding factors that increase noise. In addition, the peak value i of the inverter current Iinv within a predetermined period is m Obtain the peak value i m The phase command value φtrg is calculated from the current command value itrg, and the gate signal of the inverter circuit 13 is generated based on the above phase difference φinv and phase command value φtrg.

[0066] Furthermore, the power converter shown in Figure 1 may have a control program that implements multiple functions. These multiple functions may include the following functions (a), (b), (d) to (i).

[0067] Function (a): A function to measure the inverter current Iinv and inverter voltage Vinv input from the power supply side resonant circuit 12 to the inverter circuit 13.

[0068] Function (b): A function to detect the phase difference φinv between the inverter current Iinv and the inverter voltage Vinv.

[0069] Function (d): The peak value i of the inverter current Iinv measured in function (a) above. m A function to retrieve data.

[0070] Function (e): A function that calculates the phase command value φtrg from the peak value im and the current command value itrg obtained in function (d) above, according to the formula shown in the lower part of Figure 2.

[0071] Function (f): A function that calculates the deviation between the phase difference φinv and the phase command value φtrg and outputs it to the PI controller.

[0072] Function (g): A function that outputs an adjusted phase amount φout, which is a phase difference brought closer to the phase command value φtrg by PI control, from the PI controller to the PWM control unit.

[0073] Function (h): The PWM control unit has the function of generating a gate signal for the inverter circuit 13 in accordance with the adjusted phase amount φout.

[0074] Function (i): A function to drive the inverter circuit 13 with the generated gate signal.

[0075] According to the control program of this embodiment, by using a control program that realizes the above functions (a), (b), (d) to (i), control based on feedback from the rectifier 23 adjacent to the battery 24 to the inverter circuit 13 is possible. Compared to independent control of the inverter circuit 13, this control allows for control in response to fluctuating factors, reduces conduction loss in the inverter circuit 13, and enables higher efficiency and avoidance of factors that increase noise.

[0076] Figure 5 is a flowchart illustrating a program that performs control based on feedback from the rectifier 23 to the inverter circuit 13, as shown in Figures 1 and 2. This control program can be implemented by having a computer execute it, and the power converter shown in Figure 1 may have this control program.

[0077] This control program controls a power converter as shown in Figure 1, which includes a rectifier 23 electrically connected to a power output coil 21 that receives power from a power supply coil 11 in a non-contact manner and supplies rectified current and voltage from the input current to the outside; an inverter circuit 13 that receives inputs of inverter voltage Vinv and inverter current Iinv, which are transmitted from the power output coil 21 to the power supply coil 11 and reflect the output from the rectifier 23 via a power supply side resonant circuit 12, and receives inputs of AC voltage and AC current, converts them, and outputs them to the power output coil 11 via an electrically connected power output side resonant circuit 12; a PWM control unit 34 connected to the inverter circuit 13; a PI controller 33 connected to the PWM control unit 34; a calculation unit connected to the PI controller 33; a phase detector 32 connected to the calculation unit; a conversion unit connected to the calculation unit; and a peak detection unit 31 connected between the conversion unit and the phase detector 32.

[0078] As shown in Figure 5, the inverter current Iinv and inverter voltage Vinv are measured when the power transmitted from the power output coil 21 to the power supply coil 11 is input to the inverter circuit 13 via the power output resonant circuit 12 (step (a)). Next, the phase difference φinv between the inverter current Iinv and the inverter voltage Vinv is detected (step (b)).

[0079] In parallel with step (b), steps (d) and (e) below are performed. In other words, the peak value im of the inverter current Iinv measured in step (a) is obtained (step (d)). Next, the phase command value φtrg is calculated from the acquired peak value im and current command value itrg using the equation in the lower part of Figure 2 (step (e)).

[0080] Next, the deviation φdev between the above phase difference φinv and the above phase command value φtrg is calculated and output to the PI controller 33 (step (f)).

[0081] Next, the PI controller 33 outputs the PI-adjusted phase amount φout, which is the phase difference brought closer to the phase command value φtrg, to the PWM control unit 34 (step (g)).

[0082] Next, the PWM control unit 34 generates a gate signal for the inverter circuit 13 corresponding to the adjusted phase amount φout (step (h)).

[0083] Next, the inverter circuit 13 is driven by the generated gate signal (step (i)).

[0084] According to the control program described above, power is transmitted from the power output coil 21 to the power supply coil 11. Therefore, the output from the rectifier 23 is reflected in step (a) of measuring the inverter current Iinv and inverter voltage Vinv input from the power output resonant circuit 12 to the inverter circuit 13. Subsequently, the phase difference φinv between the inverter current Iinv and the inverter voltage Vinv is detected in step (b). In parallel with step (b), the peak value im of the inverter current Iinv measured in step (a) is obtained (step (d)), and the phase command value φtrg is calculated from the obtained peak value im and the current command value itrg using the formula in the lower part of Figure 2 (step (e)). The deviation φdev between the phase difference φinv and the phase command value φtrg obtained by the above procedure is calculated and output to the PI controller 33 (step (f)). The PI controller 33 then outputs the PI-adjusted phase amount φout, which is the phase difference brought closer to the phase command value φtrg, to the PWM control unit 34 (step (g)). The PWM control unit 34 generates a gate signal for the inverter circuit 13 corresponding to the adjusted phase amount φout (step (h)). The PWM control unit 34 drives the inverter circuit 13 with the gate signal generated corresponding to the adjusted phase amount φout (step (i)). As a result, control based on feedback from the rectifier 23, which is close to the external power supply unit, to the inverter circuit 13 is possible. Compared to independent control of the inverter circuit, this control allows for control according to fluctuating factors, reduces conduction loss in the inverter circuit 13, and achieves higher efficiency and avoidance of high noise factors. [Explanation of Symbols]

[0085] 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 30 Conversion section 31 Peak detector 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. The peak value i of the inverter current ｍ A peak detector that acquires the data, The aforementioned peak value i ｍ A conversion unit that converts the current command value Itrg to the phase command value φtrg using the following equation 1, A PI controller inputs the difference between the phase difference detected by the phase detector and the phase command value φtrg converted by the conversion unit, 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. [Math 1]

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, A conversion unit electrically connected to the inverter circuit, A phase detector electrically connected to the inverter circuit, It has, The phase detector detects the phase difference between the inverter current and the inverter voltage input from the power output side resonant circuit to the inverter circuit, and the conversion unit determines the peak value i of the inverter current within a predetermined period. ｍ Obtain the peak value i ｍ A power conversion device characterized by calculating a phase command value φtrg from a current command value Itrg, and driving the inverter circuit with a gate signal of the inverter circuit generated based on the phase difference and the phase command value φtrg.

5. In claim 4, The inverter circuit further comprises a PWM control unit electrically connected to the inverter circuit, The conversion unit is electrically connected to the inverter circuit via the PWM control unit. The phase detector is electrically connected to the inverter circuit via the PWM control unit. The calculation of the phase command value φtrg is performed using the following equation 1: The power conversion device is characterized in that the gate signal of the inverter circuit is generated by the PWM control unit in accordance with the phase difference which is brought closer to the calculated phase command value φtrg, and the inverter circuit is driven by the gate signal. [Math 2]

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, A power conversion device further comprising a PI controller that, upon input of the phase difference detected by the phase detector and the phase command value calculated by the conversion unit, calculates the deviation between the input signals and outputs a PI-controlled adjusted phase amount which is the phase difference brought closer to the phase command value.

8. In any of claims 5 to 7, Peak detector It further possesses, The power conversion device is characterized in that the acquisition of the peak value of the inverter current is performed by the peak detector measuring the inverter current input to the inverter circuit.

9. 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 generated by the control amount of the rectifier, is detected. The inverter current input to the inverter circuit is measured, The peak value i of the inverter current measured above ｍ Obtain the peak value i ｍ The current command value Itrg is converted to the phase command value φtrg using the following equation 1, The phase amount is adjusted by PI control based on the difference between the phase difference and the converted phase command value φtrg. 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. [Math 3]

10. In claim 9, 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.

11. 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, A conversion unit electrically connected to the inverter circuit, A phase detector electrically connected to the inverter circuit, It has, The phase difference between the inverter current and the inverter voltage input from the power output side resonant circuit to the inverter circuit is detected, and the peak value i of the inverter current within a predetermined period is determined. ｍ Obtain the peak value i ｍ A method for controlling the inverter of a power converter, characterized by calculating a phase command value φtrg from a current command value Itrg, generating a gate signal for the inverter circuit based on the phase difference and the phase command value φtrg, and driving the inverter circuit with the gate signal.

12. The power conversion device described in claim 1 has a control program that realizes multiple functions, The aforementioned multiple functions are, (a) A function to measure the inverter current and inverter voltage input from the power supply side resonant circuit to the inverter circuit, (b) A function for detecting the phase difference between the inverter current and the inverter voltage, the peak value i of the inverter current measured in the function (a) ｍ a function (d) of acquiring, The peak value i obtained in the function (d) ｍ (e) A function that calculates the phase command value φtrg from the current command value Itrg using the following equation 1. Function (f) to calculate the deviation between the phase difference and the phase command value φtrg and output it to the PI controller, The PI controller has a function (g) of outputting an adjusted phase amount, which is the phase difference brought closer to the phase command value φtrg by PI control, to the PWM control unit, The PWM control unit has a function (h) that generates the gate signal of the inverter in accordance with the adjusted phase amount, (i) A function to drive the inverter circuit with the generated gate signal, A power conversion device characterized by having the following features. [Math 4]

13. A rectifier is electrically connected to a power output coil that receives power from a power supply coil in a non-contact manner, and supplies the rectified current and voltage of the input current to the outside. An inverter circuit that receives an inverter voltage and inverter current input that reflects the output from the rectifier, transmitted from the power output coil to the power supply coil via a power supply side resonant circuit, and receives and converts an AC voltage and AC current input, and outputs it to the power supply coil via the electrically connected power output side resonant circuit, A PWM control unit connected to the inverter circuit, A PI controller connected to the PWM control unit, A phase detector connected to the PI controller, A conversion unit connected to the PI controller, A program for controlling a power converter having, (a) a step of measuring the inverter current and inverter voltage input from the power supply side resonant circuit to the inverter circuit, (b) a step in which the phase difference between the inverter current and the inverter voltage is detected by the phase detector, The peak value i of the inverter current measured in step (a) above ｍ Step (d) to obtain, The peak value i obtained in step (d) ｍ Step (e) of calculating the phase command value φtrg using the following equation 1 from the value of the current command value Itrg in the conversion unit. Step (f) calculates the difference between the phase difference and the phase command value φtrg and outputs it to the PI controller, Step (g) of outputting the PI-controlled adjusted phase amount, which is the phase difference brought closer to the phase command value φtrg, from the PI controller to the PWM control unit, Step (h) of generating the gate signal of the inverter in the PWM control unit in accordance with the adjusted phase amount, Step (i) of driving the inverter circuit with the generated gate signal, A control program that causes a computer to execute something. [Math 5]

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