JP2008263683A - Charging circuit and control method thereof - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a charging circuit for monitoring the voltage of AC power for several periods immediately before the charging operation, to make an automatic decision based on the results of monitoring and automatically change control parameters, and to provide a control method thereof. <P>SOLUTION: The charging circuit comprises a voltage monitor circuit for monitoring the AC voltage of AC power supplied from an AC power source and outputting the results of monitoring as an AC voltage monitor signal, a rectifier circuit where switching elements are bridge-connected, and a control circuit for calculating the peak voltage value and the period of AC power based on the AC voltage monitor signal before starting the charging operation, determining an AC power system connected with the charging circuit, selecting the control parameters of every AC power system preset in a memory, and controlling the switching elements based on the selected control parameters. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a method for controlling a charging circuit during battery charging, and more particularly to a method for setting control parameters before charging.

  When using a charging device today, the AC power system side voltage is used in Japan, North America, etc., and the AC100V system is used in Europe, etc., and the charging device rating varies depending on the region. Yes.

  Since the rating of the charging device is different in this way, if the user does not recognize and use the AC power system for each region, problems such as when the protective function does not operate correctly or optimal electrical characteristics cannot be obtained occur. Sometimes. In addition, when the correct charging device is not used in the AC power system, an optimal control parameter is not set, and malfunction may occur.

  In order to solve such a problem, the user himself / herself performs switching using a switch that switches the AC power system provided in the charging device or the like, or determines the AC power source by using another device, Switching operations and settings such as being able to supply AC power suitable for the area are performed. In addition, a method is considered in which the protection function performs only self-protection without determining the AC power system voltage.

  According to Patent Literature 1, the commercial power supply AC200V is rectified to output rectified power to the stationary power supply device, while the portable power supply device rectifies commercial power supply AC100V and outputs rectified power. . Here, when the stationary power supply device and the portable charging device are combined, one of the rectified power is selected by the electronic switch, and the selected rectified power is converted into electromagnetic energy by the high frequency inverter and supplied to the electric vehicle. Here, the fitting detection unit detects the fitting state when the stationary power supply device and the portable charging device are combined, determines the operation mode based on the presence or absence of this combined signal, and selects the rectified power according to this operation mode Proposals have been made to control by the control unit.

  According to Patent Document 2, voltage conversion means for generating DC power of a desired voltage by performing voltage conversion processing on input power input from the outside, and supplying the generated DC power to a storage battery, and voltage conversion The means receives a voltage characteristic setting means for setting a voltage characteristic in which direct current power supplied to the storage battery is equal to or less than a given maximum value, and receives an instruction given from the outside, and a predetermined maximum corresponding to the instruction There has been proposed a charging device that is mounted together with a storage battery in an electric vehicle having a maximum value giving means for giving a value to a voltage characteristic setting means and flexibly adapts to the rating of a wiring device such as an outlet.

  However, if the protection function is performed only for self-protection without determining the AC system voltage shown above, the power that can be extracted from the AC power system becomes a minimum design, and a large capacity cannot be extracted. Conversely, if the max design is made within the self-protection range, there is a possibility that the breaker will be dropped at 100 VAC.

  In addition, if a voltage drop starts in an environment where the power supply situation is bad, the current will be detected and the breaker will fall, so it is necessary to limit the current, but this threshold is determined if the AC power system voltage is not determined. It will be unusable.

Moreover, in patent document 1, 2, based on the alternating voltage waveform supplied from an alternating current power source before performing charging operation of a charging device, the control part of automatic determination of an alternating current power system and controlling a pressure | voltage rise and a power factor improvement is carried out. It does not automatically switch control parameters. For example, there is no description of automatically determining whether the AC 100V system or the AC 200V system is based on the peak value and automatically switching the control parameter.
JP 2000-004542 A Japanese Patent Laid-Open No. 10-285819

  The present invention has been made in view of the above circumstances, and monitors the AC power voltage for several cycles immediately before the charging operation, and automatically determines the AC power system based on the monitoring result, and is optimal for charging. It is an object to provide a charging circuit that automatically switches various control parameters and a control method therefor.

  A charging circuit that converts AC power input from an AC power source, which is one aspect of the present invention, into DC power and charges the battery, and monitors the AC voltage of the AC power supplied from the AC power source A voltage monitor circuit for outputting the monitored result as an AC voltage monitor signal, a rectifier circuit in which switching elements are bridge-connected, and a peak voltage value of the AC power based on the AC voltage monitor signal before starting charging. Calculating a cycle, determining an AC power system connected to the charging circuit, selecting a control parameter for each AC power system preset in a memory, and controlling the switching element based on the selected control parameter And a control circuit that performs the operation.

  In order to automatically determine the AC power system voltage with the above configuration, for example, in a factory or a stand capable of rapid charging, the user has to set up an appropriate AC power system in a mixed environment where AC 100 V and AC 200 V are supplied. Malfunctions and inefficiencies due to incorrect settings can be eliminated.

  Preferably, the charging circuit is provided with a current monitor circuit that monitors the alternating current of the alternating current power supplied from the alternating current power source and outputs the monitored result as an alternating current monitor signal, and the control parameter for each alternating current power system. A current limit value for limiting the current of the charging circuit based on the alternating current monitor signal in the memory of the control circuit, and for protecting the charging circuit from overvoltage based on the alternating voltage monitor signal An overvoltage protection limit value and a low voltage protection limit value for protecting the charging circuit at a low voltage may be set based on the AC voltage monitor signal.

  Preferably, a current displacement limit value for restricting a displacement of a current flowing through a capacitor provided at a subsequent stage of the rectifier circuit may be set in the memory of the control circuit as the control parameter for each AC power system.

  Preferably, the control circuit includes a power factor control unit, and a power factor control parameter used for control of the power factor control unit is set in the memory of the control circuit as the control parameter for each AC power system. Also good.

Further, the charging circuit may be provided in a bidirectional insulation type inverter device.
The present invention relates to a charging circuit control method for charging a battery by converting AC power input from an AC power source into DC power, and monitoring an AC voltage of the AC power supplied from the AC power source. The monitored result is an AC voltage monitor signal, and before starting charging, the peak voltage value and period of the AC power is calculated based on the voltage monitor signal, the AC power system connected to the charging circuit is determined, Select a control parameter that optimizes control of the rectifier circuit configured in a bridge for each of the AC power systems set in advance in the memory, and based on the selected control parameter, the control circuit of the rectifier circuit provided in the charging circuit It is the control method of the charging circuit which controls a switching element.

  According to the present invention, it is possible to monitor the AC power voltage for several cycles immediately before the charging operation, automatically determine the AC power system based on the monitoring result, and automatically switch the optimal control parameter for charging. .

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
The charging circuit of the present invention monitors the AC voltage for several cycles immediately before the charging operation, and is based on the peak value of the voltage monitored for identifying the AC power system (for example, AC100V system or AC200V system) connected to the charging circuit. Automatic determination is performed, the control parameters are automatically switched for each AC power system, and the charging circuit is appropriately controlled.

Example 1
FIG. 1 is a diagram illustrating a charging circuit. 1 includes a battery 2, a smoothing circuit 3, a rectifier circuit 4, a plug 5, a current monitor circuit 6, a voltage monitor circuit 7, a control unit 8, a memory 9, a capacitor C2, coils L2, L3, and a capacitor C3. It consists of.

The charging circuit 1 is a circuit that charges the battery 2 by converting AC power input from the AC power source 11 through the outlet 10 into DC power by the rectifier circuit 4.
The smoothing circuit 3 includes a coil L1 and a capacitor C1, and is a circuit that smoothes the output voltage of the rectifier circuit 4.

  The rectifier circuit 4 forms a bridge circuit with four diodes D1 to D4. A first switching element Q1 is connected in parallel to the diode D2. The first switching element Q1 has a collector terminal connected to the cathode of the diode D2, and an emitter terminal connected to the anode of the diode D2. The diode D4 is connected in parallel with the second switching element Q2. The second switching element Q2 has a collector terminal connected to the cathode of the diode D4 and an emitter terminal connected to the anode of the diode D4.

The current monitor circuit 6 monitors the AC current of the AC power supplied from the AC power source 11 to the charging circuit 1 and outputs the monitored result as an AC current monitor signal.
The voltage monitor circuit 7 monitors the AC voltage of the AC power supplied from the AC power source 11, and outputs the monitored result as an AC voltage monitor signal.

  The control unit 8 ensures that the input voltage to the rectifier circuit 4 is always higher than the terminal voltage of the battery 2 by a predetermined value during the period from when the terminal voltage of the battery 2 becomes the predetermined voltage to the upper limit voltage. Further, each duty of the switching elements Q1, Q2 is varied.

  When the AC power input to the filter composed of the coils L2, L3 and the capacitor C3 is positive, when the switching element Q1 is turned on and the switching element Q2 is turned off, energy is accumulated in the coil L2. Next, when the switching element Q1 is turned off and the switching element Q2 is turned on, the energy accumulated in the coil L2 is accumulated in the capacitor C2 via the diode D1. Further, when the AC power input to the filter is negative, when the switching element Q1 is turned off and the switching element Q2 is turned on, energy is accumulated in the coil L3. Next, when the switching element Q1 is turned on and the switching element Q2 is turned off, the energy accumulated in the coil L3 is accumulated in the capacitor C2 via the diode D3. Therefore, when each duty of the switching elements Q1 and Q2 is increased, a voltage value between both ends ef of the capacitor C2 is increased. Further, when each duty of the switching elements Q1 and Q2 is decreased, the voltage value between both ends ef of the capacitor C2 is decreased.

  Each duty of switching elements Q1 and Q2 at the time of charging of battery 2 may be obtained based on the terminal voltage of battery 2 and a voltage that is always higher than the terminal voltage by a predetermined value, or based on the current flowing through battery 2. You may ask.

  Further, when the battery 2 is charged, the switching elements Q1 and Q2 may be simultaneously turned on and off. For example, when the AC power input to the filter composed of the coils L2 and L3 and the capacitor C3 is positive and the switching elements switching elements Q1 and Q2 are simultaneously turned on, the bridge circuit 2 is short-circuited, and energy is supplied to the L2 and L3. Is accumulated. In this state, when the switching element Q1 is turned off, the energy accumulated in L2 and L3 is accumulated in the capacitor C2 via the diode D1.

  When the battery 2 is charged, switching is performed so that the phase of the input voltage waveform to the rectifier circuit 4 and the phase of the input current waveform to the rectifier circuit 4 coincide with each other based on the AC voltage and AC current input to the filter. The elements Q1 and Q2 may be driven.

  The control circuit 8 is a circuit including a logic circuit or CPU for controlling the operation as described above, and also includes a memory 9. The control circuit 8 is provided with a circuit for calculating the peak voltage value and cycle of the AC power based on the voltage monitor signal before starting charging, and determines the AC power system connected to the charging circuit 1. And the control parameter for every alternating current power system previously set to the memory 9 is selected, and switching element Q1, Q2 is controlled based on the selected control parameter. The AC power system indicates the peak voltage value and period of AC power of the AC power source 11, and indicates AC 100V, 50Hz, AC 200V, 60Hz, and the like, for example.

Next, an operation for specifying the AC power system and setting of control parameters for controlling the switching elements Q1 and Q2 of the rectifier circuit 4 will be described.
FIG. 2 is a flowchart for illustrating an operation for determining whether the AC power system is an AC 100V AC power system or an AC 200V AC power system. Here, although two types of AC power systems are determined, there is no particular limitation.

  In step S21, the voltage monitor circuit 7 monitors the voltage of the AC power system for several cycles during startup. The monitoring result of the voltage monitor circuit 7 is transferred to the control circuit 8 as an AC voltage monitor signal, and the AC power system is determined by detecting the maximum value and the minimum value of the AC voltage. In the case of the first embodiment, A / D conversion is performed to capture the AC voltage monitor signal into the control circuit 8, and the numerical value indicated by the converted AC voltage monitor signal is within a numerical value range corresponding to preset AC90V to AC160V. Determine whether. If it is within the range, it is determined that the AC power system is AC100V, and the process proceeds to step S22. If it is out of range, the process proceeds to step S23. Here, in order to determine that the signal is an AC signal, the zero cross is detected and the period is also calculated.

  In step S22, an AC 100V control parameter is set in a variable setting area prepared in advance for setting a control parameter stored in the memory 9 of the AC 100V AC power system.

  In step S23, the voltage of the AC power system is monitored for several cycles by the voltage monitor circuit 7 as in S21. The monitoring result of the voltage monitor circuit 7 is transferred to the control circuit 8 as an AC voltage monitor signal, and the AC power system is determined by detecting the maximum value and the minimum value of the AC voltage. It is determined whether the numerical value indicated by the A / D converted AC voltage monitor signal is within a numerical value range corresponding to preset AC 180 V to AC 264 V. If it is within the range, it is determined that the AC power is AC 200V, and the process proceeds to step S24. If it is out of range, it will transfer to step S21 and will determine again. Here, in order to determine that the signal is an AC signal, the zero cross is detected and the period is also calculated.

  In step S24, an AC 200V system control parameter is set in a variable setting area prepared in advance for setting a control parameter stored in the memory 9 of the AC 200V AC power system.

  When the AC power system is selected and the setting of the control parameters is completed, the charging operation is started. It is also possible to prevent the operation from starting unless the maximum value, minimum value, and cycle of the AC voltage are appropriate.

  In addition to the hold of the maximum value and the minimum value, it is possible to determine the AC voltage from only the maximum value or only the minimum value. In addition, there is a method of calculating from the sum of squares of measured values for one period.

Next, control parameters will be described.
Control parameters are set in advance in the memory 9 to optimize the control of the rectifier circuit 4 for each AC power system. The control parameters are the current limit value that can be taken out from each AC power system, the current displacement limit value, the overvoltage protection on the AC power system side, the limit value for undervoltage protection, and each power factor control required by the power factor controller (Power Factor Controller) Set the coefficient.

  The current limit value is a parameter for limiting the current of the charging circuit 1 based on the alternating current monitor signal input to the control circuit 8. The overvoltage protection limit value is a parameter for protecting the charging circuit 1 from an overvoltage based on the alternating current monitor signal. The low voltage protection limit value is a parameter that is set to protect the charging circuit 1 in the event of a power failure (at the time of low voltage) based on the AC voltage monitor signal. The current displacement limit value limits the displacement of the current flowing through the capacitor C2. Here, a DC voltage monitor circuit (not shown) is connected between the output terminals ef of the rectifier circuit 4. This DC voltage monitor circuit detects a DC voltage (intermediate voltage signal) for charging applied to the battery 2.

FIG. 3 shows the configuration of the power factor control unit provided in the control unit. Power factor control parameters are used for control of the power factor control unit.
A voltage monitor signal (instantaneous value) is obtained by A / D conversion from the voltage monitor circuit 7, and a voltage absolute value signal obtained from the absolute value of the A / D converted voltage monitor signal is input to the multiplier 31. The multiplier 31 multiplies the required current conversion coefficient to generate the reference current signal in order to convert the input voltage absolute value signal into the required current.

  Next, the adder 32 calculates the difference between the current absolute value signal obtained by A / D conversion from the current monitor circuit 6 and the absolute value of the A / D converted current monitor signal and the reference current signal. . The calculated difference signal is input to a PFC proportional unit 33, a PFC integrating unit 34, and a PFC differentiating unit 35 provided for performing power factor correction PID control.

  Read the power factor control parameters (which are control parameters) stored in the memory 9 for each AC power system in the region where the control parameters of the PFC proportional unit 33, PFC integration unit 34, and PFC differentiation unit 35 are set. Set. For example, if the AC power source is determined to be an AC 100V AC power source, an AC 100V power factor control parameter is set.

  The PFC proportional unit 33 is set with a proportional power factor control parameter. The PFC integration unit 34 is set with a power factor control parameter for integration. In the PFC differentiation unit 35, a power factor control parameter for differentiation is set. Here, the PID control may be controlled only by the PFC proportional unit 33 and the PFC integration unit 34.

The adder 36 adds and outputs the calculation processing results of the PFC proportional unit 33, PFC integrator 34, and PFC differentiator 35.
On the other hand, the division unit 310 divides the voltage absolute value signal by a target intermediate voltage signal (digital value) preset and recorded in the memory 9. Thereafter, the adding unit 311 calculates the difference between the duty 100% signal and the output of the dividing unit 310 to calculate the boosting rate. The multiplication unit 312 multiplies the numerical value indicating the boost rate by the amplification factor which is a power factor control parameter (control parameter) set in the PFC amplification unit 313 and outputs the result.

  Next, in the adder 37, the outputs of the adder 36 and the multiplier 312 are added and input to the base of the switching element Q1 of the rectifier circuit 4. Similarly, the switching element Q2 is provided with a power factor control unit for the switching element Q2.

  Further, a limiter unit 38 is provided downstream of the adding unit 37 in order to suppress the output amplitude. Here, the control shown in FIG. 3 performs processing earlier than the cycle of AC power. For example, the operation is performed at 75 μsec.

  FIG. 4 shows a block diagram for controlling the intermediate voltage. The adder 41 calculates the difference between the intermediate voltage signal output from the DC voltage monitor circuit connected between the output terminals ef of the rectifier circuit 4 and the target intermediate voltage signal (digital value) preset in the memory 9. calculate. Processing is performed by the intermediate voltage proportional unit 42 indicating the output signal of the adding unit 41, and displacement limiting processing within a certain period is performed by the displacement limiting unit 43. Thereafter, the output of the displacement limit unit 43 is subjected to amplitude control by a loop composed of the addition unit 44, the required current amplitude unit 45, and the current limit unit 46 so that the required current amplitude is obtained.

The current limit control parameter set in the current limit unit 46 is a current limit value. The control parameter set in the displacement limit unit 43 is a displacement limit value.
The control shown in FIG. 4 operates at a cycle of 50 Hz or 60 Hz.

  With the above configuration, the AC voltage is monitored for several cycles immediately before the charging operation, and for example, it is automatically determined whether the system is AC100V system or AC200V system. After that, the limit value of the current that can be extracted from the system, the displacement limit value of the current that is extracted from the system, the overvoltage protection on the system side, the limit value of the low voltage protection, the low voltage protection of the intermediate voltage, and the control coefficient of PFC operation automatically Switch.

(Example 2)
The bidirectional insulated DC / AC inverter shown in FIG. 5 is a circuit in which bridge circuits 12 and 13 are added to the charging circuit 1 used in the first embodiment. In addition, the same code | symbol is attached | subjected to the same structure as the structure shown in FIG.

  The bidirectionally insulated DC / AC inverter shown in FIG. 5 includes a filter (L2, L3, C3), a bridge circuit 14 (first bridge circuit), a capacitor C2, and a bridge circuit 13 (second bridge circuit). And the transformer T1, the bridge circuit 12 (third bridge circuit), the capacitor C1, the coil L1, and the switching elements Q9 to Q12 and the switching elements Q1 and Q2 when the battery 2 is charged. Control circuit 8 that drives switching elements Q1 to Q4 and switching elements Q5 to Q8 when the AC power is output from the DC / AC inverter, voltage monitor circuit 7 that monitors the AC voltage input from the AC power to the filter, and bridge circuit 13 DC voltage monitor circuit (not shown) for monitoring the input voltage to the It is configured to include a current monitoring circuit 6 for monitoring the.

  The first power conversion is configured by the bridge circuit 14 and the capacitor C2 when the battery 2 is charged, and is performed by the bridge circuit 14 when the AC power is output from the bidirectional insulated DC / AC inverter.

  The second power conversion is configured by the bridge circuit 13 when the battery 2 is charged, and is performed by the bridge circuit 13 and the capacitor C2 when AC power is output from the bidirectional insulated DC / AC inverter.

  The third power conversion is configured by the bridge circuit 12 and the capacitor C1 when the battery 2 is charged, and is performed by the bridge circuit 12 when the AC power is output from the bidirectional insulated DC / AC inverter.

  Here, switching elements Q1 to Q4, switching elements Q5 to Q8, and switching elements Q9 to Q12 may be configured by FETs (Field Effect Transistors) to which diodes are connected in parallel. The bridge circuit 14, the bridge circuit 13, or the bridge circuit 12 may be configured by a half bridge type bridge circuit including two switching elements.

  A bridge circuit 13 composed of four switching elements Q9 to Q12 and connected to the bridge circuit 14 via a capacitor C2, and a bridge composed of four switching elements Q5 to Q8 and connected to the bridge circuit 13 via a transformer T1 The circuit 12 includes a capacitor C1 and a coil L1 provided between the bridge circuit 12 and the battery 2. Switching elements Q1-Q4, switching elements Q9-Q12, and switching elements Q5-Q8 are, for example, IGBTs (Insulated Gate Bipolar Transistors), and a diode is connected in parallel to each switching element.

  When the battery 2 is charged, the bidirectionally insulated DC / AC inverter turns on and off the switching elements Q9 and Q12 and the switching elements Q10 and Q11 of the bridge circuit 13 alternately. That is, when the battery 2 is charged, the AC power input from the outside to the bridge circuit 14 via the filter is rectified by a diode connected in parallel to the switching elements Q1 to Q4 of the bridge circuit 14 and also by the capacitor C2. Smoothed and converted to DC power.

  Next, the DC power is converted into AC power by the bridge circuit 13 and output to the bridge circuit 12 via the transformer T1. Next, the AC power is rectified by diodes D5 to D8 connected in parallel to the switching elements Q5 to Q8 of the bridge circuit 12, and is smoothed by the capacitor C1 and converted to DC power. The DC power is supplied to the battery 2 via the coil L1.

  When AC power is output to the outside, the switching elements Q5 and Q8 and the switching elements Q6 and Q7 of the bridge circuit 12 are alternately turned on and off, and the switching elements Q1 and Q4 and the switching element Q2 of the bridge circuit 14 are turned on and off. Q3 is alternately turned on and off. That is, when AC power is output, DC power obtained from the battery 2 is converted into AC power by the bridge circuit 12 and output to the bridge circuit 13 via the transformer T1. Next, the AC power is rectified by diodes D9 to D12 connected in parallel to the switching elements Q9 to Q12 of the bridge circuit 13, and is smoothed by the capacitor C2 and converted to DC power. The DC power is converted to AC power by the bridge circuit 14 and output to the outside through a filter.

Here, it is assumed that the terminal voltage of the battery 2 at the start of charging is sufficiently low. In this example, the winding ratio of the primary side coil and the secondary side coil of the transformer T1 is 1: 1.
Also in the charging circuit of the bidirectionally insulated DC / AC inverter configured as described above, the AC voltage is monitored for several cycles just before the charging operation in the same manner as in the first embodiment, and for example, it is automatically determined whether it is AC100V system or AC200V system. , To automatically switch the control value of the limit value of the current that can be extracted from the system, the displacement limit value of the current that is extracted from the system, the overvoltage protection on the system side, the limit value of the undervoltage protection, the undervoltage protection of the intermediate voltage, and the PFC operation Can do.

  In order to automatically determine the AC power system voltage, for example, in a factory or a stand capable of rapid charging, malfunction due to the troublesome setting of the system voltage by the user in a mixed environment where AC 100 V and AC 200 V are supplied, or incorrect settings And inefficiency can be eliminated.

  The present invention is not limited to the above-described embodiment, and various improvements and modifications can be made without departing from the gist of the present invention.

FIG. 3 is a circuit diagram illustrating a configuration of a charging circuit according to the first embodiment. It is a flowchart for determining an AC power system. It is a block diagram which shows the structure of the power factor control part provided in a control part. The block diagram which controls the intermediate voltage provided in the control part is shown 1 is a circuit diagram of a bidirectional insulation type DC / AC inverter provided with a charging circuit used in Example 1. FIG.

Explanation of symbols

1 charging circuit, 2 battery, 3 smoothing circuit, 4 rectifier circuit, 5 plug,
6 current monitor circuit, 7 voltage monitor circuit, 8 control circuit (control unit),
9 memory, 10 outlets, 11 AC power source,
12 third bridge circuit, 13 second bridge circuit, 14 first bridge circuit,
C2 capacitor, L1, L2, L3 coil, C1, C3 capacitor,
31 multiplier, 32 adder,
33 PFC proportional part, 34 PFC integrating part, 35 PFC differentiating part,
36 addition unit, 37 addition unit, 38 limiter unit, 310 division unit, 311 addition unit,
312 multiplier, 313 PFC amplifier,
41 addition unit, 42 intermediate voltage proportional unit, 43 displacement limit unit, 44 addition unit,
45 Required current amplitude part, 46 Current limit part,

Claims (6)

A charging circuit that converts AC power input from an AC power source into DC power and charges the battery,
A voltage monitor circuit that monitors the AC voltage of the AC power supplied from the AC power source and outputs the monitored result as an AC voltage monitor signal;
A rectifier circuit in which switching elements are bridge-connected;
Before starting charging, the AC power monitoring system calculates a peak voltage value and a period of the AC power based on the AC voltage monitor signal, determines an AC power system connected to the charging circuit, and the AC power system preset in the memory. A control circuit that selects each control parameter and controls the switching element based on the selected control parameter;
A charging circuit comprising: A current monitor circuit for monitoring the alternating current of the alternating current power supplied from the alternating current power source to the charging circuit, and outputting the monitored result as an alternating current monitor signal;
Overcurrent based on the AC voltage monitor signal and a current limit value for limiting the current of the charging circuit based on the AC current monitor signal in the memory of the control circuit as the control parameter for each AC power system An overvoltage protection limit value for protecting the charging circuit from a low voltage and a low voltage protection limit value for protecting the charging circuit at a low voltage based on the AC voltage monitor signal are set. The charging circuit according to 1.   The current displacement limit value for limiting a displacement of a current flowing in a capacitor provided in a subsequent stage of the rectifier circuit is set in the memory of the control circuit as the control parameter for each AC power system. 2. The charging circuit according to 2. The control circuit includes a power factor control unit,
4. The power factor control parameter used for controlling the power factor control unit is set in the memory of the control circuit as the control parameter for each AC power system. 5. The charging circuit described in 1.   A bidirectional insulated inverter device comprising the charging circuit according to claim 4. A method of controlling a charging circuit that converts AC power input from an AC power source into DC power and charges the battery,
The AC voltage of the AC power supplied from the AC power source is monitored, and the monitored result is an AC voltage monitor signal,
Before starting charging, the peak voltage value and period of the AC power are calculated based on the voltage monitor signal, the AC power system connected to the charging circuit is determined, and each AC power system preset in the memory Select the control parameters that optimize the control of the bridged rectifier circuit,
A control method for a charging circuit, comprising: controlling a switching element of the rectifier circuit provided in the charging circuit based on the selected control parameter.

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