JP5734356B2 - Power converter - Google Patents

Description

  The present invention relates to a power converter for charging a high voltage battery from an AC power source, for example.

  In recent years, electric vehicles and hybrid vehicles have attracted attention as environmentally friendly vehicles. Such an automobile drives an inverter and an electric motor generator (motor generator) driven by the inverter, in addition to or in addition to the conventional engine, together with an auxiliary battery (low pressure) for operating a control circuit and the like as in a conventional automobile. Drive battery (high voltage).

  The driving battery (high voltage) is charged with regenerative power while traveling in a hybrid vehicle, but in recent years, it is charged from the outside of the vehicle by a household AC power source or a dedicated charging facility like a PHEV vehicle or an electric vehicle. An in-vehicle charging device is mounted on a vehicle as a device for that purpose.

  In recent years, these vehicles and charging facilities have become popular not only in Japan but also overseas. Due to differences in the types of vehicles and the specifications of domestic AC power supplies or dedicated charging facilities in Japan and overseas, Various specifications have been required for the apparatus.

  As an example, a general in-vehicle charger that charges a battery using a commercial AC power source will be described and the configuration thereof will be described. These chargers generally include an AC-DC power converter that converts a commercial AC power source into a DC voltage, and a DC-DC power converter that converts the DC voltage into a DC voltage necessary for battery charging. Is.

  For example, in a charger having a general configuration disclosed in Patent Document 1 below, an AC power source supplied from an AC power source (ACS) is converted into a predetermined DC voltage by an AC-DC power converter (AD), and a capacitor Store in (C1). The AC-DC power converter (AD) includes an AC reactor (L1) connected in series to an AC power supply (ACS), two diodes (D1, D2) for preventing backflow, and two semiconductor switching elements (Q1, Q2). ).

  The DC-DC power converter (DD) converts the voltage of the capacitor (C1) into a DC voltage necessary for charging using the voltage of the capacitor (C1) as a power source. The DC-DC power converter (DD) includes a bridge circuit composed of four semiconductor switch elements (S1 to S4), a transformer (T1) connected to the bridge circuit, and four diodes on the secondary side of the transformer T1 ( D3 to D6) and a reactor L2 that connects the diode bridge circuit to the battery Batt. The control device controls a charging voltage and an output current for charging the battery Batt.

  The conditions for determining the specifications of in-vehicle charging equipment include power supplied from household AC power supply or dedicated charging equipment, and battery capacity mounted on the vehicle. To go, both tend to be larger. If this situation is dealt with by the above-described circuit configuration, the withstand voltage, current resistance, etc. required for individual parts become large, the cost of the adopted parts becomes very high, and the size becomes very large. Further, as described above, if each of the various specifications is dealt with, the mass production effect cannot be achieved and the cost becomes very high.

  For example, the following Patent Document 2 is not an in-vehicle charging device, but in the case of manufacturing a fuel cell system with a wide variety of maximum powers, in order to sufficiently demonstrate mass production effect (cost), a plurality of fuel cell units, A configuration corresponding to a wide variety of specifications is disclosed by including a cooperative operation control unit that adjusts the output power sharing of a plurality of fuel cell units.

Further, in-vehicle chargers (power conversion devices) are required not to waste the supplied power (that is, to be able to be charged at low cost) when considered from the user's viewpoint. In general, when a component is subjected to a high heat load due to waste of electric power, that is, loss, it may cause deterioration or failure of each component. For this reason, it is required to increase the power conversion efficiency of the apparatus.

  Elements that cause a large power loss are the reactors (L1, T1, L2), switching elements (Q1, Q2, S1 to S4), diodes (D1 to D6), etc. of the above-mentioned Patent Document 1, mainly each element. Depends on the number of switching operations, ON / OFF time, and the like.

  In the fuel cell system disclosed in Patent Document 2 below, power supply according to load power can be performed by providing the number of fuel cell units according to the required power on the demand side (however, a load by DC / AC conversion from the fuel cell can be performed). Assuming power supply to the equipment). In addition, the manufacturer can enjoy the merit of manufacturing cost by standardizing the fuel cell unit. The power generation efficiency of the fuel cell unit is increased by adjusting the number of operating each fuel cell unit according to the load power on the demand side.

  For example, Patent Literature 3 below discloses a power conversion device for performing high-efficiency conversion in a wide range of input power. This power conversion device includes a plurality of converters with different ratings, and includes a control unit that changes the combination to be operated among the plurality of converters according to the supplied power as a unit that increases efficiency. ing.

  In the power conversion device of Patent Document 3 below, the efficiency of the power conversion device may be maximized by determining a converter to operate a plurality of converters having different ratings based on a preset share of burden. it can.

JP-A-8-107607 JP 2004-178877 A JP 2008-022628 A

  As described above, the device described in Patent Document 2 described above includes a configuration that can supply power according to load power by providing the number of fuel cell units according to demand-side required power, and load on the demand side. By adjusting the number of operating each fuel cell unit according to the electric power, the fuel cell unit is provided with a portion that increases the power generation efficiency. Further, in Patent Document 2, the operation number is adjusted by operating a minimum number of units necessary for supplying load power (the fuel cell unit is operated near 100% of the rated output).

  However, as described above, in the configuration of such a power conversion device, losses of different factors occur in each component, and the power conversion efficiency depends on charging conditions (supplied input conditions, necessary output conditions, etc.) It differs depending on the connected destination or the state of the vehicle battery. Therefore, depending on the number of units required to supply load power (not a highly efficient configuration) and charging conditions (supplied input conditions and required output conditions, etc.), there is a problem that the power conversion efficiency of the device deteriorates. was there. In addition, there is a problem that a high heat load due to power loss is applied to the components due to deterioration in efficiency.

  In order to solve this, a method of operating with a combination of a plurality of converters with different ratings and maximizing efficiency, such as the device described in Patent Document 2 above, can be considered, but the manufacturing cost was considered. In this case, there is a problem that the number of parts increases and the cost becomes high.

  Another problem is that because of the different ratings, it is difficult for other converters to substitute for each converter.Therefore, there are usage methods in the event of a failure and usage methods that take life (deterioration) into account. There was a problem that it was difficult.

  The present invention has been made to solve such problems, and an object of the present invention is to provide a power conversion device that can cope with various charging conditions and has high power conversion efficiency regardless of the charging conditions. .

The present invention is a power conversion unit that is connected between an AC power supply device and a load and converts AC power from the AC power supply device into DC power of the voltage of the load, and from the AC power supply device to the power conversion unit. An input voltage measurement unit that measures an input voltage, an output voltage measurement unit that measures a voltage supplied from the power conversion unit to the load, and a current that is input from the AC power supply device to the power converter unit. An input current measurement unit for measuring, an output current measurement unit for measuring a current supplied from the power conversion unit to the load, and a power conversion for controlling the power conversion unit based on a measurement result of at least one of the measurement units A control unit, wherein the power conversion unit converts the AC power into a DC having a predetermined potential, and the AC-DC power conversion unit. DC converts the output of the section to a predetermined output power - a DC power converter unit, an AC consists - is constructed by connecting a plurality of parallel DC power converter, the power converter control section controls the input current The control target value of the input current for controlling the output current and the control target value of the output current for controlling the output current are set, and the power conversion control unit converts the power conversion device from the AC power supply device to the load. A distribution power determination unit that determines distribution of power to a plurality of AC-DC power converters, wherein the distribution power determination unit is a measurement result of an output current of the output current measurement unit, or a control target of the output current According to the value, the power is distributed to each of the plurality of AC-DC power converters at a ratio including 0, and the power converter is characterized in that.

  According to the present invention, it is possible to provide a power conversion device or the like that can cope with various charging conditions and has high power conversion efficiency regardless of the charging conditions.

It is a schematic block diagram which shows the structure of the vehicle-mounted power converter device in Embodiment 1 of this invention. It is a figure which shows an example of a structure of the alternating current-direct current power conversion part (AC / DC) in Embodiment 1 of this invention. It is a figure which shows an example of a structure of the direct current-direct current power conversion part (DC / DC) in Embodiment 1 of this invention. It is a block diagram which shows the detail of the power conversion control part in Embodiment 1 of this invention. It is a figure which shows the charge profile of a common lithium ion battery. It is a figure which shows the charge profile in Embodiment 1 of this invention. It is a block diagram which shows a part of control calculation in Embodiment 1 of this invention. It is a block diagram which shows a part of control calculation in Embodiment 1 of this invention. It is a block diagram which shows a part of control calculation in Embodiment 1 of this invention. It is a block diagram which shows a part of control calculation in Embodiment 1 of this invention. It is a flowchart which shows the outline | summary of the process of the distributed electric power determination part in Embodiment 1 of this invention. It is a flowchart which shows the outline | summary of a process of the distribution priority setting part in Embodiment 1 of this invention. It is a block diagram which shows the detail of the power conversion control part in Embodiment 2 of this invention. It is a flowchart which shows the outline | summary of a process of the distributed electric power determination part in Embodiment 2 of this invention. It is a flowchart which shows the outline | summary of a process of the distribution priority setting part in Embodiment 2 of this invention. It is a block diagram which shows the detail of the power conversion control part in Embodiment 3 of this invention. It is a flowchart which shows the outline | summary of the process of the charge mode determination part in Embodiment 3 of this invention. It is a flowchart which shows the outline | summary of the process of the distribution electric power determination part in Embodiment 3 of this invention. It is a block diagram which shows the detail of the power conversion control part in Embodiment 4 of this invention. It is a flowchart which shows the outline | summary of a process of the distributed electric power determination part in Embodiment 4 of this invention. It is a block diagram which shows the detail of the power conversion control part in Embodiment 5 of this invention. It is a flowchart which shows the outline | summary of the process of the distributed electric power determination part in Embodiment 5 of this invention. It is a figure which shows an example of a structure of the snubber circuit in Embodiment 6 of this invention. It is a block diagram which shows the detail of the power conversion control part in Embodiment 6 of this invention. It is a flowchart which shows the outline | summary of the process of the distributed electric power determination part in Embodiment 6 of this invention. It is a flowchart which shows the outline | summary of a process of the distribution number restriction | limiting part in Embodiment 6 of this invention. It is a block diagram which shows the detail of the power conversion control part in Embodiment 7 of this invention. It is a flowchart which shows the outline | summary of the process of the distribution electric power determination part in Embodiment 7 of this invention. It is a flowchart which shows the outline | summary of the process of the distributed electric power determination part in Embodiment 8 of this invention. It is a block diagram which shows the detail of the power conversion control part in Embodiment 9 of this invention. It is a flowchart which shows the outline | summary of the process of the distributed power determination part in Embodiment 9 of this invention. It is a flowchart which shows the outline | summary of a process of the distribution number restriction | limiting part in Embodiment 9 of this invention. It is a flowchart which shows the outline | summary of the process of the distributed electric power determination part in Embodiment 10 of this invention. It is a flowchart which shows the outline | summary of a process of the distribution priority setting part in Embodiment 10 of this invention. It is a flowchart which shows the outline | summary of a process of the distribution rate setting part in Embodiment 10 of this invention. It is a flowchart which shows the outline | summary of a process of the distribution priority setting part in Embodiment 11 of this invention.

  The present invention is a power conversion device for an in-vehicle charging device, in particular, with a low cost configuration and various charging conditions including rapid charging and long-distance traveling (supplied input conditions and necessary output conditions, etc.) A power conversion device and the like having high power conversion efficiency can be provided even when a failure occurs or a life is taken into consideration, regardless of charging conditions.

  Hereinafter, a power converter according to the present invention will be described with reference to the drawings according to each embodiment. In each embodiment, the same or corresponding parts are denoted by the same reference numerals, and redundant description is omitted. Hereinafter, an in-vehicle power conversion device will be described as an example of the power conversion device, but the present invention is not limited to in-vehicle use.

Embodiment 1 FIG.
FIG. 1 is a schematic block diagram of an in-vehicle power conversion device according to Embodiment 1 of the present invention. The power conversion device 100 is connected to a household AC power supply or a dedicated infrastructure charging facility (AC power supply device) 10, converts the AC power supply voltage into a DC voltage corresponding to the voltage of the driving battery 108, and drives the driving battery 108. To charge. The inverter 12 that controls the motor generator (MG) 11 is connected to the driving battery 108 and supplied with necessary power.

  The power conversion apparatus 100 charges the driving battery 108 with electric power from outside the vehicle. That is, for example, the power conversion device 100 and the driving battery 108 are mounted on the vehicle, and the AC power supply device 10 that is a home AC power supply or a dedicated infrastructure charging facility is connected to the power conversion device 100. Although described here as being mounted on an electric vehicle not equipped with an engine, it may be mounted on a hybrid vehicle (PHEV vehicle) that travels using a motor and an engine together. Further, the load that receives power supply may be applied to other systems (loads that receive power supply) that are not on-vehicle driving batteries. The same applies to the following other embodiments.

  The power conversion device 100 according to the first embodiment includes a power conversion control unit 20, an input voltage measurement unit 21, an input current measurement unit 22, a power conversion unit 23, an output voltage measurement unit 24, and an output current measurement unit 25. The Here, the power conversion control unit 20 is included in the power conversion apparatus 100, but may be configured to be separately controlled from the outside.

  The input voltage measuring unit 21 measures the voltage supplied from the AC power supply device 10. The input current measuring unit 22 measures the current supplied from the AC power supply device 10. The output voltage measurement unit 24 measures the voltage (output voltage) of the driving battery 108. The output current measuring unit 25 measures the output current to the driving battery 108.

  The power conversion unit 23 includes AC-DC power converters 1011 to 101n having the same configuration and connected in parallel N (N ≧ 2). The AC-DC power converter 101n includes a first current measurement unit 102n, an AC-DC power conversion unit (hereinafter AC / DC unit) 103n, a DC-DC power conversion unit (DC / DC unit) 104n, a second Current measuring section 105n. Electric power (current) is distributed to each AC-DC power converter 101n based on the result calculated by the distributed power determination unit 130 of the power conversion control unit 20.

  The first current measuring unit 102n measures the current Ii (n) distributed to the AC-DC power converter 101n and input to the AC / DC unit 103n. The AC / DC unit 103n converts AC power distributed to the AC-DC power converter 101n into DC power having a predetermined potential. The DC / DC unit 104n converts the output of the AC / DC unit 103n into predetermined DC output power. The second current measuring unit 105n measures a current Io (n) that is output from the DC / DC unit 104n and charges the battery.

  In the power conversion unit 23, relays 106n for turning ON / OFF the power distribution to each AC-DC power converter 101n are provided on the input side of each AC-DC power converter 101n.

  FIG. 2 shows an example of the configuration of the AC / DC unit 103n, which is, for example, a gradation control type AC / DC power converter. In this configuration, a current sensor (first current measurement unit) 102n that measures a current Ii (n) distributed to the AC-DC power converter 101n and input to the AC / DC unit 103n, and an input AC current A switching circuit 202n including a rectifier circuit 201n including a bridge circuit of a plurality of diodes D1n, a reactor L1n, and a plurality of semiconductor switching elements S1n (not limited to semiconductor elements, the same applies hereinafter), and a smoothing for smoothing an output voltage The capacitor C2n and the voltage sensor 203n that measures the voltage Vcn applied to the smoothing capacitor C2n are provided. In FIG. 2, the first current measuring unit 102n of FIG. 1 is included in the AC / DC unit 103n. The configuration of the AC / DC unit 103n shown in FIG. 2 is an example, and the method is not limited to this.

  The switching circuit 202n includes, for example, a capacitor (not shown), and constitutes a single-phase inverter with a part of the switching element S1n. In the switching circuit 202n including the inverter, on / off of a predetermined semiconductor switch is controlled so that the DC voltage of the capacitor follows the target value, and the single-phase inverter has a predetermined value so that the input power factor becomes 1. The AC switch is controlled and output by PWM control of the semiconductor switch, and the DC voltage generated on the AC side is superimposed on the AC power supply voltage so that the DC voltage of the smoothing capacitor C2n follows the target voltage of the smoothing capacitor C2n. To control. A plurality of the single-phase inverters may be arranged and connected.

  FIG. 3 shows an example of the configuration of the DC / DC unit 104n, which is a full-bridge DC / DC converter, for example. In this configuration, a switching circuit 301n including a plurality of semiconductor switching elements S2n (not limited to semiconductor elements, the same applies hereinafter) for converting the direct current output of the AC / DC unit 103n into alternating current, the transformer T1n, and the transformer T1n A rectifier circuit 302n composed of a bridge circuit of a plurality of diodes D2n that rectifies the output, a smoothing reactor L2n for smoothing the output from the rectifier circuit 302n, a smoothing capacitor C3n, and an output current (ie, a DC / DC unit) And a current sensor (second current measuring unit) 105n that measures an output current Io (n) from 104n. In FIG. 3, the second current measuring unit 105n of FIG. 1 is included in the DC / DC unit 104n. The configuration of the DC / DC unit 104n shown in FIG. 3 is an example, and the method is not limited to this.

As an AC power supply device 10 that is a home AC power supply or a dedicated infrastructure charging facility, the following conditions are required for domestic use.
・ Single phase 100V, 10A
・ Single phase 200V, 15A
In recent years, it is also required to meet the following conditions as a product for both domestic / overseas (for example, Europe).
・ Single phase 240V, 30A

  When the power conversion device 100 that satisfies these input conditions is configured by an AC = 1 to DC power converter 1011 with N = 1, the components shown in FIG. 2 or 3 (for example, diodes D1n and D2n, reactors L1n and L2n, The specifications required for the semiconductor switching elements S1n, S2n, the transformer T1n, etc., particularly the rated current and the allowable loss (heat generation) in each component, are very severe. At present, the number of parts that satisfy these requirements is small, the cost is high, and the size is very large to realize.

  When the N = 2 AC-DC power converter 101n is used, the specifications required for the above components shown in FIG. 2 or FIG. 3 are, in particular, constant currents and allowable losses (heat generation) in each component are 1/2. It can be realized with the domestic specifications shown above.

  When N> 2, further required specifications are relaxed, and the parallel configuration of the AC-DC power converter 101n can reduce both cost and size in a required specification that is greater than or equal to a predetermined value.

  In this embodiment, for the sake of simplicity, the following description will be made assuming that N = 3 and the AC-DC power converters 101n are arranged in parallel (each block configured in parallel is a subscript of a to c). Indicated by). That is, in order to satisfy the requirements described above, the maximum input condition of the power conversion device 100 is a single-phase 240V-30A, and the maximum input condition of each AC-DC power converter 101a-c configured in parallel is 240V-10A. Is assumed. The voltage of the driving battery (high voltage) 108 is assumed to be 370V.

FIG. 4 is a block diagram showing details of the power conversion control unit 20. The power conversion control unit 20
An input voltage monitoring unit 121 that monitors the input voltage Vac (detected by the input voltage measuring unit 21) of the AC power supply device 10, and
An input current monitor unit 122 that monitors an input current Iac (output of the input current measurement unit 22) of the AC power supply device 10, and
An output voltage monitoring unit 123 that monitors the driving battery voltage Vbat (output of the output voltage measuring unit 24);
And an output current monitoring unit 124 that monitors the driving battery output current Ibat (output of the output current measuring unit 25).

Moreover, in each of the AC-DC power converters 101a, b, c,
A first current monitor unit 125a that monitors an input current Ii (a) (output of the current sensor 102a) to the AC / DC unit 103a;
A first current monitoring unit 125b that monitors an input current Ii (b) (output of the current sensor 102b) to the AC / DC unit 103b;
A first current monitor unit 125c that monitors an input current Ii (c) (output of the current sensor 102c) to the AC / DC unit 103c;
A second current monitoring unit 126a that monitors an output current Io (a) (output of the voltage sensor 105a) from the DC / DC unit 104a;
A second current monitoring unit 126b that monitors an output current Io (b) (output of the voltage sensor 105b) from the DC / DC unit 104b;
A second current monitoring unit 126c that monitors an output current Io (c) (output of the voltage sensor 105c) from the DC / DC unit 104c;
An intermediate voltage monitoring unit 127a for monitoring the output voltage Vc (a) of the AC / DC unit 103a (the output of the voltage sensor 203a);
An intermediate voltage monitoring unit 127b for monitoring the output voltage Vc (b) of the AC / DC unit 103b (the output of the voltage sensor 203b);
An intermediate voltage monitoring unit 127c that monitors the output voltage Vc (c) of the AC / DC unit 103c (the output of the voltage sensor 203c).

  Moreover, the control value calculating part 90 which calculates the control value of AC-DC power converter 101a-c is provided, and the control value calculating part 90 is the control target value of the output and input current of AC-DC power converter 101a-c. Current target value setting unit 140 that sets the power and how to distribute power to AC-DC power converters 101a, 101b, and 101c configured in parallel according to the measurement results of current target value setting unit 140 Control target values for calculating the control values of the AC / DC units 103a to 103c and the DC / DC units 104a to 104c according to the results of the distributed power determination unit 130, the current target value setting unit 140, and the distributed power determination unit 130 And an arithmetic unit 160.

Further, the power conversion control unit 20 according to the calculation result of the control target value calculation unit 160,
AC / DC control units 151a, 151b, and 151c that generate signals for controlling the semiconductor switching element S1n of the switching circuit 202n of the AC / DC units 103a to 103c;
DC / DC control units 152a, 152b, and 152c that generate signals for controlling the semiconductor switching element S2n of the switching circuit 301n of the DC / DC units 104a to 104c;
Relay control units 153a, 153b, 153c for ON / OFF control of the relays 106a-c connected to the AC-DC power converters 101a-c.

  Next, the details of the current target value setting unit 140 will be described. As described above, the current target value indicates an output current for charging the battery (driving battery 108) or an input current supplied from an AC power source (AC power supply device 10) or the like.

  As the EV / HEV drive battery (high voltage) 108, a lithium ion battery is generally used. FIG. 5 is a diagram showing a charging profile of a general lithium ion battery. (A) of FIG. 5 is a figure which shows the battery voltage (henceforth a cell voltage) of 1 cell of a lithium ion battery. A battery having a large capacity, such as the driving battery 108, has a plurality of cells connected in series. The battery voltage is defined by cell voltage × number of cells. In general, the battery voltage of one cell is often a voltage as shown in FIG.

  FIG. 5B is a diagram showing the output current of the lithium ion battery. In general, when the cell voltage falls below about 2.5 V shown in FIG. When entering the overdischarge region, 1C described in (b) (1C is a value determined by the rated capacity of the battery. The current value at which discharge is completed in 1 hour after constant current discharge of the cell having the capacity of the nominal capacity value. For example, in a cell having a nominal capacity value of 2.2 Ah, when charged at 1 C = 2.2 A), irreversible damage may occur in the cell.

  In that case, in order to recover the charge, charging is performed in a mode called pre-charging and charging with a current of less than 0.1 C. As a result, when the cell voltage recovers and exceeds the precharge threshold voltage of 2.5 V, charging is performed in the normal mode. However, in general, use in the precharge mode causes a reduction in battery life, and is not used regularly. The normal charging is composed of two types, a constant current charging (rapid charging) mode and a constant voltage charging (top-off charging) mode.

In constant current charging, charging is performed with a fixed current that normally does not exceed 1 C until the cell voltage changes from 2.5 V to 4.2 V. The charging of the cell at this time is generally completed to about 70 to 90%.
The constant voltage charging is performed to charge as much capacity as possible after the constant current charging. The battery is charged so that the voltage is constant at 4.2V. At this time, the output current decreases with time. Generally, when the output current decreases to about C / 10, charging is completed.

  FIG. 6 shows a charging profile of power conversion device 100 in this embodiment. The broken line indicates the output current command value, the solid line indicates the output current, and the alternate long and short dash line indicates the battery voltage. Of course, the charging profile is in line with the profile of each cell of the driving battery 108. As shown in FIG. 6, it is composed of a constant current mode 301, a constant power mode 302, and a constant current mode 303.

  The constant current mode 301 controls the output current according to the output current command value It (see FIG. 6). The output current command value It means the maximum value that can be charged at that time point determined from the state (SOC) of the driving battery 108. In the constant current mode 301, the output current command value It is applied to the driving battery 108 specified by the input voltage Vac. The maximum chargeable value Itmax is obtained. The output current command value It can be acquired from an external ECU (vehicle control unit), a dedicated charging facility (including the AC power supply device 10), or the like (not shown). Or it can also be set as the structure judged in the power converter device from the input conditions of preset alternating current power.

  In the constant power mode 302, charging is controlled by the maximum input power or the maximum rated power of the power conversion device 100. Here, the output current command value It corresponds to the constant current mode 301, but this is a mode in which the output current must be reduced due to the input or power limitation of the power conversion device 100. Therefore, the constant power mode 302 is included in the constant current mode in the charging profile of the driving battery 108.

  The constant current mode 303 controls the output current according to the output current command value It. The output current command value It means the maximum value that can be charged at that time determined from the state (SOC) of the driving battery 108. In the constant current mode 303, the state (SOC) of the driving battery 108 is fully charged. It is a state close to and limited. The battery charging profile in FIG. 5 corresponds to the range described as constant voltage charging.

Current target value setting unit 140 sets a current target value according to the above-described charging profile. The target value in this embodiment is the target value Ibat * of the output current Ibat.
In the constant current modes 301 and 303, the output current command value It is set to the target value Ibat * of the output current Ibat.
In the constant power mode 302, a current that provides output power corresponding to the maximum input power is set to the target value Ibat * of the output current Ibat.

  The distribution power determination unit 130 determines to which AC-DC power converter of the AC-DC power converters 101a to 101c provided with N (three in this embodiment) the power is distributed. . Details will be described later.

  Next, the control target value calculation unit 160, the AC / DC control units 151a to 151c, and the DC / DC control units 152a to 152c will be described. Here, a description will be given on the assumption that the distributed power determination unit 130 determines that power is evenly distributed to N pieces.

  The control target value calculation unit 160 sets the control target values of the AC-DC power converters 101a to 101c according to the above-described current target value setting unit 140. In the constant current modes 301 and 303, control is performed by a control calculation block as shown in FIG. First, the target value Io (n) * of the output current of the DC / DC unit 104n is set. Io (n) * is Ibat * / N set by the current target value setting unit 140 as shown in FIG. Then, the converter output current Io (n) is compared with the output of the second current monitor unit 126n, and feedback control is performed so that Io (n) approaches Io (n) *. The duty DCDC duty (n) of the semiconductor switching element S2n of the switching circuit 301n of the DC / DC unit 104n is set. Based on this value, the DC / DC control unit 152a generates a signal for controlling the semiconductor switching element S2n with DCDC duty (n).

  Next, as shown in FIG. 8, the target value Vc (n) * of the output voltage of the AC / DC unit 103n is set. Vc (n) * compares the previously set DCDC duty (n) with the target duty value DCCD Duty (n) * and feeds back Vc (n) so that DCDC duty (n) approaches DCDC duty (n) *. The target value Vc (n) * for (n) is set. Here, DCCDUtility (n) * is set to approach 1 in order to reduce the loss of the switching element.

  Then, as shown in FIG. 9, the output voltage Vc (n) of the AC / DC unit 103n is compared with the output of the first intermediate voltage monitor unit 127n, so that Vc (n) approaches Vc (n) *. The target value Ii (n) * of the input current Ii (n) of the AC / DC unit 103n is set by feedback control. The target value Ii (n) ** N of the target output current of the AC / DC unit 103n becomes the target value Iac * of the input current.

  Further, the input current Ii (n) of the AC / DC unit 103n is compared with the output of the first current monitor unit 125n, and feedback control is performed so that Ii (n) approaches Ii (n) *. / Duty ACDC duty (n) of semiconductor switching element S1n of switching circuit 202n of DC unit 103n is set. Based on this value, the AC / DC control unit 151n generates a signal for controlling the semiconductor switching element S1n with ACDC duty (n). The AC / DC unit 103n generally performs control for bringing the power factor close to 1 in combination with the above, but the description thereof is omitted here.

  In the constant power mode 302, the input current Iac is an upper limit value limited by the household AC power supply or the AC power supply device 10 of the dedicated infrastructure charging facility, or an upper limit value Imax defined by the rating of the in-vehicle power conversion device 100. Therefore, the AC / DC unit 103n inputs the maximum power and performs only control for bringing the power factor close to 1. The description is omitted here.

  The DC / DC unit 104n is controlled by a control calculation block as shown in FIG. The output of the intermediate voltage monitoring unit 127n that monitors the output voltage Vc (n) of the AC / DC unit 103n is compared with the target value Vc (n) * so that Vc (n) approaches V (n) *. The target value Io (n) * of the output current Io (n) of the DC / DC unit 104n is set by feedback control. Vc (n) * is obtained in the same manner as shown in FIG.

  The target value Io (n) ** N of the target output current of the DC / DC unit 104n is Ibat *. The output current Io (n) of the DC / DC unit 104n is compared with the output of the second current monitor unit 126n, and feedback control is performed so that Io (n) approaches Io (n) *. / Duty DCDC duty (n) of semiconductor switching element S2n of switching circuit 301n of DC unit 104n is set. Based on this value, the DC / DC control unit 152n generates a signal for controlling the semiconductor switching element S2n with DCDC duty (n).

  Naturally, when the power distributed to each AC-DC power converter 101n exceeds the rating, the control is performed by limiting the current target value.

Hereinafter, before describing the distributed power determination unit 130, the loss of the AC-DC power converter will be described.
Generally, the loss of an AC-DC power converter includes the following.
(1) Copper loss of reactor
(2) Diode conduction loss and recovery loss
(3) SW loss and conduction loss of switching elements

The power loss of the DC / DC unit 104n as shown in FIG. 3 is as follows when applied to the above.
Loss of (1) above T1n, L2n
Loss of above (2) D2n
Loss of (3) above S2n

Similar loss occurs in the AC / DC unit 103n as shown in FIG.
Loss L1n of (1) above
Loss of above (2) D1n
Loss of (3) above S1n

  Moreover, the above-mentioned loss is roughly classified into current-dependent and voltage-dependent (depending on both, that is, there is also power dependency). The current-dependent loss is proportional to the square of current / current, for example, copper loss in (1), conduction loss in (2) and (3). The voltage-dependent loss is proportional to the voltage, for example, the recovery loss (2) and the SW loss (3).

Here, when the current-dependent loss is a main element that is proportional to the square of the current, and the voltage-dependent loss is a main element that is proportional to the voltage, the AC / DC power conversion of the parallel configuration in this embodiment If the current loss when operated with one AC-DC power converter is Pi, the current loss when operated with a plurality of AC-DC power converters SPi≈N × (Pi / N ² ), And when N = 3, it is about 1/3. When the voltage loss when operating with one AC-DC power converter is Pv,
When operating with a plurality of AC-DC power converters, the voltage loss SPv≈N × Pv, and when N = 3, the voltage loss is approximately three times.

Therefore, if the loss of the entire system when distributing to N AC-DC power converters is P (N),
P (N) = N × Pv + N × (Pi / N ² )
If P (1)> P (N) holds, it is better to operate with a plurality of AC-DC power converters. Therefore, the output current value Ip that is effective for distributing the output current value i satisfying P (1) = P (N) to the plurality of AC-DC power converters (101n). Here, the threshold TH is set as the main factor is that the current-dependent loss is proportional to the square of the current, and the voltage-dependent loss is proportional to the voltage. However, the circuit configuration and components used are different. For example, since the above relational expression changes, the threshold value TH is not limited to this.

  Next, the distributed power determination unit 130 will be described. FIG. 11 and FIG. 12 are schematic flowcharts showing processing of the distributed power determination unit 130. Here, Ioth is Ip / 3 of the output current effective for distribution to the AC-DC power converter (101n), and is effective for distribution to the AC-DC power converter (101n). It is the minimum output current threshold value of each AC-DC power converter (101n).

  Of course, Ioth shall not exceed the rating of each AC-DC power converter (101n). First, in step S100 (distribution priority setting unit), the number of power conversions Cn (a), Cn (b), and Cn (c) of each AC-DC power converter 101a-c is confirmed, and the number of power conversions is small. Allocate from Pr to Pr1, Pr2, Pr3. The number of power conversions is obtained from the control state of the relay control unit (153), for example.

The general flow of step S100 is as shown in FIG. In step S101, it is confirmed whether Cn (a) is smaller than Cn (b). If Cn (a) is smaller than Cn (b), the process proceeds to step S102. In step S102, it is confirmed whether Cn (a) is smaller than Cn (c). If Cn (a) is smaller than Cn (c), the process proceeds to step S103. In step S103, it is confirmed whether Cn (b) is smaller than Cn (c). If Cn (a) is smaller than Cn (c), the process proceeds to step S104. In step S104, the priority is increased from the one with the smaller number of times (Cn (a) <Cn (b) <Cn (c)), the first priority Pr1 = Cn (a) and the second priority Pr2 = Cn. (b) Set priority No. 3 Pr3 = Cn (c).
In other cases, according to steps S105 to S111, Pr1, Pr2, and Pr3 are set in ascending order of the number of power conversions Cn (N), and the process proceeds to step S200.

Returning to FIG. 11, in step S <b> 200, it is determined whether or not the output current Ibat acquired by the output current monitor unit 124 is three times or more of Ioth. If Ibat * is not less than 3 times Ioth, the number N of converters to be distributed is set to 3 in step S202. If Ibat * is less than three times Ioth, the process proceeds to step S201.
If Ibat * is at least twice Ioth in step S201, the number of converters to be distributed N = 2 is set in step S203. If Ibat * is less than twice Ioth, the number of converters to be distributed N = 1 is set in step S204.

And it transfers to step S205-S207, and according to S202-S204, the relay (106) which connects the AC-DC power converter (101) which distributes electric power, and the AC power supply device 10 is turned ON, and AC-DC which is not distributed The relay (106) connecting the power converter (101) and the AC power supply device 10 is turned off.
And it transfers to step S208-S210 and updates the frequency | count of power conversion according to S202-S204.

Here, the power distribution is turned on / off using the relay (106), but it may be performed by current value control such as setting the charging target current to zero.
In this embodiment, the number of times of power conversion is used for the prioritization of the AC-DC power converter (101) that distributes power, but the total power conversion time, the total output power (determined by calculation above) or Temperature (by sensor) or the like may be used. The number of power conversions Cn in the flow illustrated in FIG. 12 may be changed to the total power conversion time, the total output power, or the temperature. Drives with priority given to those having a short total power conversion time, a small total output power, or a low temperature. S208 to S210 in FIG. 11 are not necessary in the case of temperature, and use the current temperature. The total power conversion time and the total output power are integrated with the power conversion time and the output power, respectively.

  After the distributed power determination unit 130 ends, the control target value calculation unit 160 of each AC-DC power converter (101) is executed. The control target value calculation unit 160 of each AC-DC power converter is as described above. The control target value calculation unit 160 of each AC-DC power converter sets the control target value of each AC-DC power converter according to the distribution number N set by the distribution power determination unit 130 and Pr1 to Pr3. To do. Thereby, the output power of each AC-DC power converter is determined. Since the AC-DC power converter has a parallel configuration, the voltage applied to the AC-DC power converter is the same. Therefore, the distribution ratio of the output current is equal to the distribution power. In this embodiment, the output current target value Ibat * is used. However, the distribution number may be determined based on the output current monitor value Ibat.

As described above, if the output current flowing to each AC-DC power converter that can be expected to reduce power loss by increasing the number of distributions to distribute the output power exceeds the predetermined value, increase the number of distributions to be operated and distribute the output power. If the output current flowing to each AC-DC power converter, which is concerned about an increase in power loss due to an increase in the number of distributions, is less than a predetermined value, the power conversion efficiency can be reduced by reducing the number of distributions to a predetermined number or more. I can give you.
When the output current exceeds a predetermined value, the power conversion efficiency can be increased, the heat load on each component can be reduced, and the occurrence of deterioration and failure can be reduced.
In addition, by preferentially using an AC-DC power converter with a small number of times of charging, it is possible to suppress the load from being concentrated on a specific AC-DC power converter, and to maintain a long life of the power converter. be able to.
In addition, by providing a plurality of AC-DC power converters, the rating of each power converter can be suppressed, and a relatively inexpensive component can be used.

Embodiment 2. FIG.
FIG. 13: is a schematic block diagram of the power conversion control part of the vehicle-mounted power converter device which concerns on Embodiment 2 of this invention. Since the entire configuration of the in-vehicle power conversion device 100 according to the second embodiment is the same as that of the above-described embodiment, the description thereof is omitted.
The power conversion control unit 20 in this embodiment is obtained by changing the distributed power determination unit 130 of the power conversion control unit 20 of FIG. 4 shown in the first embodiment as a distributed power determination unit 130A as follows. The number N of AC-DC power converters (101) will be described as 2. Other configurations are the same as those in the first embodiment.

  In this embodiment, power conversion control unit 20 uses the outputs of input current monitor unit 122 and input voltage monitor unit 121 as inputs of distributed power determination unit 130A. The distributed power determination unit 130A determines how to distribute power to the power converters 101a and 101b configured in parallel according to the measurement results of the input current monitor unit 122 and the input voltage monitor unit 121.

  FIG. 14 is a schematic flow showing processing of the distributed power determination unit 130A. Here, Iith is an upper limit value Imax of an effective value defined by the AC power supply 10 which is a household AC power supply or a dedicated infrastructure charging facility. As described above, when the input current reaches the upper limit value Imax, the mode becomes the constant power mode, and the output current Ibat decreases as the battery voltage increases. For this reason, the current-dependent loss of the DC-DC power converter 104n decreases.

  Here, the output current Ibat when the input current reaches the maximum value Imax is not necessarily the output current Ip shown in the first embodiment. However, in this embodiment, the current-dependent loss starts to decrease. The maximum value Imax of the input current is used for simple determination. Of course, the threshold value is not limited to this, and may be an input current determined by the rating of the power converter (101) and the output current Ip.

  First, in step S100 (distribution priority setting unit), as shown in FIG. 15, the total charge times Tn (a) and Tn (b) of the power converters 101a and 101b are compared in step S401. The total charge time is calculated using, for example, a microcomputer timer. If Tn (a) is smaller than Tn (b) in step S401, the process proceeds to step S402. In step S402, the one with the shorter charging time is set as the higher priority, and Pr1 = a and Pr2 = b. If Tn (a) is greater than or equal to Tn (b) in step S401, the process proceeds to step S403. In step S403, Pr1 = b and Pr2 = a are set.

  Returning to FIG. 14, next, in step S90, it is confirmed whether or not the input power PacRMS = IacRMS × VacRMS is greater than or equal to the maximum power Pmn allowable in each power converter (101). If PacRMS ≧ Pmn in step S90, the following flow is not performed and the process proceeds to step S203.

  If PacRMS ≧ Pmn is not satisfied in step S90, the process proceeds to step S300. Here, Pac is the active power, IacRMS is the effective value of the input current, and VacRMS is the effective value of the input voltage (calculated based on the monitor values of the monitor units 121 and 122). Here, although detailed description is omitted, depending on the required charging power (= input power), if the number of distribution of the power converter is reduced, the rating of each power converter may be exceeded. In that case, it is necessary to set the distributed power to a number that does not exceed the rating of each power converter.

  For example, if the maximum input condition of the power conversion device 100 in this embodiment is a single-phase 240V-30A, the maximum input condition of each AC-DC power converter 101a, b configured in parallel is equivalent to 240V-15A. . For this reason, electric power exceeding 240V-15A equivalency cannot be distributed to each power converter. In such a case, the distribution number needs to be the maximum value. In this embodiment, this step is performed in the distributed power determination unit 130A, but may be calculated outside the distributed power determination unit 130A and received as the minimum value of the number of distributions.

  If IacRMS is smaller than Iith in step S300, the process proceeds to step S204. If IacRMS is greater than or equal to Iith in step S300, the process proceeds to step S203. Steps S203 to S207 are the same as those in the first embodiment, and a description thereof will be omitted. And it transfers to step S209-S210, and updates power conversion time according to S203-S204. t is a control cycle.

  Here, IacRMS is used, but target value IacRMS * of IacRMS may be used. Further, although the threshold value of the input current is used as the threshold value, the rated current of the circuit may be used. Since limit value Imax of input current IacRMS is defined by input voltage VacRMS, the threshold value may be input power defined by input voltage VacRMS × input current Imax instead of input current Imax. Moreover, you may use the input electric power prescribed | regulated by the input voltage VacRMSxrated current. Alternatively, the determination may be made by not the input current IacRMS ≧ the upper limit value Imax of the input current but the target value Ibat * of the output current or the output current Ibat <the current command value It.

As described above, when the output current flowing to each AC-DC power converter that can be expected to reduce power loss by increasing the number of distributions for distributing output power exceeds a predetermined value, or by increasing the number of distributions for distributing output power. Each power that can be expected to be reduced by increasing the number of distributions to distribute the output power, judging from the input current whether the output current flowing to each power converter that is concerned about an increase in power loss is less than the predetermined value If the output current flowing to the converter exceeds a predetermined value, increase the number of distributions to be operated and increase the number of distributions to distribute the output power. When the value is less than the value, the power conversion efficiency can be increased by reducing the number of distributions that can be expected to be greater than or equal to the predetermined value.
When the output current exceeds a predetermined value, the power conversion efficiency can be increased, the heat load on each component can be reduced, and the occurrence of deterioration and failure can be reduced.
Moreover, by using it preferentially from a power converter with a short charging time, it is possible to suppress a load from being concentrated on a specific power converter, and to maintain a long life of the power converter.

Embodiment 3 FIG.
FIG. 16: is a schematic block diagram of the power conversion control part of the vehicle-mounted power converter device which concerns on Embodiment 3 of this invention. Since the overall configuration of the in-vehicle power conversion device 100 according to the third embodiment is the same as that of the above-described embodiment, the description thereof is omitted.
The power conversion control unit 20 in this embodiment is obtained by changing the distributed power determination unit 130 of the power conversion control unit 20 of FIG. 13 shown in the second embodiment as a distributed power determination unit 130B as follows.

  The power conversion control unit 20 in this embodiment includes a charge mode determination unit 170 that determines a charge mode (see 6) that is a power conversion mode, and includes the output current target value Ibat * and the determination result of the charge mode determination unit 170. Accordingly, a change is made to determine how to distribute power to the power converters 101a and 101b configured in parallel.

  FIG. 17 is a schematic flow showing processing of the charging mode determination unit 170. In step S500, it is confirmed whether or not the current mode Pmode is the constant power mode 302 (CP). If the current mode Pmode is the constant power mode 302 (CP), it is determined in step S502 whether the output current target value Ibat * is equal to or less than the current command value It. If the target value Ibat * of the output current is equal to or less than the current command value It in step S502, the process proceeds to step S504, where the current mode Pmode = CP is set. If the target value Ibat * of the output current is larger than the current command value It in step S502, the process proceeds to step S503, and it is determined whether or not the current command value It is larger than the maximum value Itmax of the output current command value. In step S503, if It is smaller than Itmax, the process proceeds to step S506, and the current mode Pmode is set to be the constant current mode 303 (CC2). In step S503, if It is equal to or greater than Itmax, the process proceeds to step S505, and the current mode Pmode is set to be the constant current mode 301 (CC1).

  If it is determined in step S500 that the current mode Pmode is not the constant power mode 302 (CP), the process proceeds to step S501. In step S501, it is determined whether or not the effective value IacRMS * of the target value of the input current is equal to or greater than the upper limit value Iith of the input current. If it is determined in step S501 that the effective value IacRMS * of the target value of the input current is equal to or greater than the upper limit value Iith of the input current, the current mode Pmode is set as the constant power mode 302 (CP) in step S504. If it is determined in step S501 that the effective value IacRMS * of the target value of the input current is less than the limit value Iith of the input current, the process proceeds to step S503. Since step S503 and subsequent steps are the same, description thereof is omitted.

  FIG. 18 is a schematic flow showing the processing of the distributed power determination unit 130B. As described above, when the input current reaches the upper limit value Imax defined by the AC power supply 10 that is a household AC power supply or a dedicated infrastructure charging facility, the mode becomes the constant power mode, and the output current Ibat is increased as the battery voltage increases. Decrease. For this reason, the current-dependent loss of the DC-DC power converter 104n decreases.

  Here, the output current Ibat when the input current reaches the maximum value Iith is not the output current Ip shown in the first embodiment. However, in this embodiment, the current-dependent loss starts to decrease. For this simple determination, a constant power mode in which the maximum value Iith of the input current is obtained is used. Of course, the switching mode is not limited to this. However, Ioth described in the first embodiment is also added as a determination condition.

  Step S100 in FIG. 18 is the same as that in the second embodiment, and a description thereof will be omitted. Next, in step S301, it is confirmed whether or not the current mode is CC1. If the current mode is CC1 in step S301, the process proceeds to step S203. Since the process of step S203 is the same as that of the second embodiment, the description thereof is omitted.

  If the current mode is not CC1 in step S301, the process proceeds to step S201. In step S201, it is determined whether or not the target value Ibat * of the output current is equal to or greater than Ioth × 2. If the target value Ibat * of the output current is equal to or greater than Ioth × 2 in step S201, the process proceeds to step S203. If the target value Ibat * of the output current is less than Ioth × 2 in step S201, the process proceeds to step S204. Since the subsequent processing is the same as that of the second embodiment, description thereof is omitted.

As described above, when the output current flowing to each power converter that can reduce power loss can be expected by increasing the number of distributions that distribute output power, or when the number of distributions that distribute output power increases, Determine whether the output current flowing to each power converter that is concerned about the increase is less than a predetermined value based on the power conversion mode and the control target value of the output current, and increase the number of distributions to distribute the output power to reduce the power loss. If the output current flowing to each power converter that can be reduced exceeds a predetermined value, increase the number of distributions to be operated and increase the number of distributions to distribute the output power to each power converter that is concerned about an increase in power loss. When the flowing output current is less than a predetermined value, the power conversion efficiency can be increased by reducing the number of distributions that can be expected to be greater than or equal to the predetermined value.
When the output current exceeds a predetermined value, the power conversion efficiency can be increased, the heat load on each component can be reduced, and the occurrence of deterioration and failure can be reduced.
Moreover, by using it preferentially from a power converter with a short charging time, it is possible to suppress a load from being concentrated on a specific power converter, and to maintain a long life of the power converter.

Embodiment 4 FIG.
FIG. 19 is a schematic block diagram of a power conversion control unit of an in-vehicle power conversion device according to Embodiment 4 of the present invention. Since the overall configuration of the in-vehicle power conversion device 100 according to the fourth embodiment is the same as that of the above-described embodiment, the description thereof is omitted.
The power conversion control unit 20 in this embodiment is obtained by changing the distributed power determination unit 130 of the power conversion control unit 20 of FIG. 13 shown in the second embodiment as a distributed power determination unit 130C as follows.

  The distributed power determination unit 130C in this embodiment includes the target value Pbat * of the output power obtained from the target value Ibat * of the output current and the output Vbat of the output voltage monitor unit 123, and the output Vac and VacRMS of the input voltage monitor unit 121. In accordance with the input power Pmax obtained from the limit value Imax of the input current defined in (1), a change is made so as to determine how power is distributed to the power converters 101a and 101b configured in parallel.

  FIG. 20 is a schematic flow showing processing of the distributed power determination unit 130C. As described above, when the input current reaches the upper limit value Imax defined by the AC power supply 10 which is a household AC power supply or a dedicated infrastructure charging facility, the mode is limited to the constant power mode, that is, the output power is limited by the upper limit value of the input power. The output current Ibat decreases as the battery voltage increases. For this reason, the current-dependent loss of the DC-DC power converter 104n decreases.

  Here, the output current Ibat when the output power is equal to the input power is not necessarily the output current Ip shown in the first embodiment, but in this embodiment, the current-dependent loss starts to decrease. For simple determination, it is used that the target value Pbat * of the output power is equal to or higher than the upper limit value of the input power. Of course, the threshold is not limited to this. However, Ioth described in the first embodiment is also added as a determination condition.

  Since step S100 and step S90 in FIG. 20 are the same as those in the second embodiment, description thereof will be omitted. In step S302, the output power target value Pbat * obtained from the output current target value Ibat * and the output voltage Vbat of the output voltage monitor unit 123 is input based on the outputs Vac and VacRMS of the input voltage monitor unit 121. It is determined whether or not the input power Pmax is greater than the current limit value Imax. If Pbat * is greater than or equal to Pmax in step S302, the process proceeds to step S201. If Pbat * is less than Pmax in step S302, the process proceeds to step S203. Since the subsequent processing is the same as that of the second embodiment, description thereof is omitted.

As described above, when the output current flowing to each power converter that can reduce power loss can be expected by increasing the number of distributions that distribute output power, or when the number of distributions that distribute output power increases, By determining whether the output current flowing to each power converter that is concerned about the increase is less than a predetermined value based on the target value of output power and the control target value of output current, power can be increased by increasing the number of distributions of output power. If the output current that flows to each power converter that can be expected to reduce loss exceeds the specified value, increase the number of distributions to be operated and increase the number of distributions to distribute the output power. When the output current flowing to the device is less than a predetermined value, the power conversion efficiency can be increased by reducing the number of distributions that can be expected to be greater than or equal to the predetermined value.
When the output current exceeds a predetermined value, the power conversion efficiency can be increased, the heat load on each component can be reduced, and the occurrence of deterioration and failure can be reduced.
Moreover, by using it preferentially from a power converter with a short charging time, it is possible to suppress a load from being concentrated on a specific power converter, and to maintain a long life of the power converter.

Embodiment 5 FIG.
FIG. 21 is a schematic block diagram of a power conversion control unit of an in-vehicle power conversion device according to Embodiment 5 of the present invention. Since the overall configuration of the in-vehicle power conversion device 100 according to the fifth embodiment is the same as that of the above-described embodiment, the description thereof is omitted.
The power conversion control unit 20 in this embodiment is obtained by changing the distributed power determination unit 130 of the power conversion control unit 20 of FIG. 13 shown in the second embodiment as a distributed power determination unit 130D as follows.

  The power conversion control unit 20 in this embodiment uses the output of the input voltage monitor unit 121 as the input of the distributed power determination unit 130D instead of the input current monitor unit 122 of the second embodiment. The distributed power determination unit 130D determines how to distribute power to the power converters 101a and 101b configured in parallel according to the measurement result of the input voltage monitor unit 121.

FIG. 22 is a schematic flow showing processing of the distributed power determination unit 130D. As described above, when the input current reaches the maximum value Imax, the mode becomes the constant power mode, and the output current Ibat decreases as the battery voltage increases. For this reason, the current-dependent loss of the DC-DC power converter 104n decreases. Further, the maximum value Imax of the input current generally increases in accordance with the input voltage Vac.
For example, as mentioned above,
・ 30A for 240V system
・ 15V for 200V system
・ 10A for 100V system
Therefore, the 240V system is most likely to be in constant current mode 301, and the 100V system is most likely to be in constant power mode 302 and constant current mode 303. Therefore, in this embodiment, this input voltage is used for a simple determination that the current-dependent loss starts to decrease.

  Step S100 in FIG. 22 is the same as that in the second embodiment, and a description thereof will be omitted. Next, in step S303, it is determined whether or not the input voltage Vac is a 240V system. If it is 240V system in step S303, the process proceeds to step S203 and the distribution number N = 2. If it is not 240V system in step S303, the process proceeds to step S304. In step S304, it is determined whether or not the input voltage Vac is a 100V system. In step S304, if the system is 100V, the process proceeds to step S204, where the distribution number N = 1. If it is not 100V system in step S304, it is determined that it is 200V system, and it is determined in step S203 whether or not the monitor value Ibat of the output current is not less than 2 × 2. If Ibat is greater than or equal to lot × 2 in step S203, the process proceeds to step S203. If Ibat is less than lot × 2 in step S203, the process proceeds to step S204. Since the subsequent processing is the same as that of the second embodiment, description thereof is omitted.

As described above, when the output current flowing to each power converter that can reduce power loss can be expected by increasing the number of distributions that distribute output power, or when the number of distributions that distribute output power increases, Power loss can be reduced by increasing the number of distributions to distribute the output power by judging whether the output current flowing to each power converter that is concerned about the increase is less than the predetermined value based on the target values of the input voltage and output current. If the expected output current flowing to each power converter exceeds the specified value, increase the number of distributions to be operated and increase the number of distributions to distribute the output power to increase the power loss. When the current is less than a predetermined value, the power conversion efficiency can be increased by reducing the number of distributions to a value that is expected to be greater than or equal to the predetermined value.
When the output current exceeds a predetermined value, the power conversion efficiency can be increased, the heat load on each component can be reduced, and the occurrence of deterioration and failure can be reduced.
Moreover, by using it preferentially from a power converter with a short charging time, it is possible to suppress a load from being concentrated on a specific power converter, and to maintain a long life of the power converter.

Embodiment 6 FIG.
FIG. 23 is a block diagram showing an example of a DC-DC power conversion unit 104n of an in-vehicle power conversion device according to Embodiment 6 of the present invention, and FIG. 24 is a schematic block diagram of a power conversion control unit. Since the entire configuration of the in-vehicle power conversion device 100 according to the sixth embodiment is the same as that of the above-described embodiment, the description thereof is omitted.

  In the DC / DC unit 104n shown in FIG. 23, a snubber circuit 303n is added to the DC / DC unit 104n in FIG. The snubber circuit 303n is a general protection circuit that absorbs a transient high voltage generated when the switch is shut off. For example, there is an RC snubber circuit in which a capacitor and a resistor are connected in series. In this embodiment, the snubber circuit 303n is used to absorb the secondary side surge voltage generated by the switching of the primary side switching circuit 301n of the transformer T1n. As described in the first embodiment, the loss is mainly divided into current dependence and voltage dependence, but the snubber circuit 303n is voltage dependence. The snubber circuit 303n in this embodiment takes a larger voltage as the battery voltage is smaller, and the loss becomes larger, which affects the loss of the power converter and becomes a large heat source.

  Accordingly, the parts around the snubber circuit 303n are placed in a severe environment due to heat generated by their own loss and the temperature rise of the ambient air in the snubber circuit 303n. For this reason, in this embodiment, when the voltage of the battery that increases the voltage applied to the snubber circuit is low, power is distributed to the power converter so as to reduce the influence of heat.

  As shown in FIG. 24, the power conversion control unit 20 in this embodiment uses the distributed power determination unit 130 of the power conversion control unit 20 of FIG. 4 shown in the first embodiment as a distributed power determination unit 130E as follows. It is changed as follows. The number N of AC-DC power converters (101) will be described as three.

  The power conversion control unit 20 in this embodiment distributes the outputs of the output voltage monitor unit 123, the input voltage monitor unit 121, and the input current monitor unit 122 in addition to the output of the current target value setting unit 140 of the first embodiment. This is input to the determination unit 130E. The distributed power determination unit 130E distributes the power to the power converters 101a to 101c configured in parallel according to the measurement results based on the output of the current target value setting unit 140 and the outputs of the monitor units 123, 121, and 122. Decide what to do.

  FIG. 25 is a schematic flow showing processing of the distributed power determination unit 130E. The flow of Embodiment 1 in FIG. 11 includes a distribution number limiting unit step S600. FIG. 26 is a schematic flow diagram showing an outline of the processing of the distribution number limiting unit step S600.

  As described above, when the output voltage decreases, the loss of the snubber circuit 303n = heat generation increases. Therefore, here, the output voltage of the snubber circuit 303n is not distributed when the output voltage is less than a predetermined value, and here, the output voltage is increased when the output voltage of the snubber circuit 303n is larger than the predetermined value. Here, the predetermined value uses two threshold values, Vth1 which is a voltage charged to some extent and Vth2 which is a threshold value lower than Vth1 which is about 1.5 to 2 times the snubber loss at Vth1, for example. To do.

  In FIG. 25, the distribution priority setting unit step S100 is the same as that in the first embodiment, and thus the description thereof is omitted. With respect to the distribution number limiting unit step S600, in step S91 of FIG. 26, it is confirmed whether or not the input power PacRMS = IacRMS × VacRMS is equal to or greater than the maximum power Pmn × 2 allowable in each power converter. When PacRMS ≧ Pmn × 2 in step S91, the following flow is not performed and the process proceeds to step S603. If PacRMS ≧ Pmn is not satisfied in step S91, the process proceeds to step S601. Next, in step S601, it is determined whether or not the output voltage Vbat is equal to or higher than Vth1. If it is Vth1 or more in step S601, the process proceeds to step S603. In step S603, the distribution limit number Nmax = 3. If it is less than Vth1 in step S601, the process proceeds to step S90.

  In step S90, it is confirmed whether or not the input power PacRMS = IacRMS × VacRMS is greater than or equal to the maximum power Pmn allowable in each power converter. When PacRMS ≧ Pmn in step S90, the following flow is not performed and the process proceeds to step S604. If PacRMS ≧ Pmn is not satisfied in step S90, the process proceeds to step S602. Next, in step S602, it is determined whether or not the output voltage Vbat is equal to or higher than Vth2. If it is Vth2 or higher in step S602, the process proceeds to step S604. In step S604, the distribution limit number Nmax = 2. If it is less than Vth2 in step S602, the process proceeds to step S605, where the distribution limit number Nmax = 1.

  Returning to FIG. 25, in step S305, it is determined whether Nmax = 1. If Nmax = 1 in step S305, the process proceeds to step S204. If Nmax is not 1 in step S305, the process proceeds to step S306. Next, in step S306, it is determined whether Nmax = 2. If Nmax = 2 in step S306, the process proceeds to step S201. If Nmax = 2 is not satisfied in step S306, the process proceeds to step S200. Since the subsequent processing is the same as that of the first embodiment, the description thereof is omitted.

As described above, when the output current flowing to each power converter that can be expected to reduce power loss by increasing the number of distributions for distributing output power exceeds a predetermined value and the loss of the snubber circuit is low, the number of distributions to be operated If the output current flowing to each power converter is concerned about the increase in power loss by increasing the number of distributions to distribute the output power, or if the snubber circuit loss is high, the output current is the predetermined value. By reducing the number of distributions that can be expected or the number of distributions that can reduce the heat generation of the snubber circuit, the power conversion efficiency can be increased and the influence of heat on peripheral components can be reduced.
When the output current exceeds a predetermined value, the power conversion efficiency can be increased, the heat load on each component can be reduced, and the occurrence of deterioration and failure can be reduced.
Moreover, it can suppress that a load concentrates on a specific power converter by using from a power converter with few frequency | counts of charging, and can maintain the lifetime of a power converter device long.

Embodiment 7 FIG.
FIG. 27 is a schematic block diagram of a power conversion control unit of an in-vehicle power conversion device according to Embodiment 7 of the present invention. Since the entire configuration of the in-vehicle power conversion device 100 according to the seventh embodiment is the same as that of the above-described embodiment, the description thereof is omitted.
The power conversion control unit 20 in this embodiment is obtained by changing the distributed power determination unit 130 of the power conversion control unit 20 of FIG. 4 shown in the first embodiment as a distributed power determination unit 130F as follows.

  In this embodiment, the power conversion control unit 20 outputs the outputs of the intermediate voltage monitor unit (a) 127a, the intermediate voltage monitor unit (b) 127b, and the intermediate voltage monitor unit (c) 127 (c) to the distributed power determination unit 130F. Input. The distribution power determination unit 130F determines how to distribute power to the power converters 101a to 101c configured in parallel according to the measurement results of the intermediate voltage monitoring units 127a to 127c.

  FIG. 28 is a schematic flowchart showing processing of the distributed power determination unit 130F. As described above, the target value Vc * of the intermediate voltage Vc is determined according to the target current Ibat * of the DC / DC unit 104, or the target current Ibat * of the DC / DC unit 104 is determined according to the intermediate voltage Vc. Therefore, basically, when the target of DCDC duty is 1, Vc (n) * increases as Ibat * increases, and Vc (n) * decreases as Ibat * decreases. When Vc (n) sticks at the upper limit, there is a possibility that Ibat cannot be supplied with the number of distributions being operated. Further, when Vc (n) sticks at the lower limit, there is a possibility that Ibat is supplied too much with the number of distributions being operated.

  As described above, when Ibat is large, increasing the number of distributions is also efficient. Further, when Ibat is small, it is more efficient to reduce the number of distributions. In this embodiment, power that can be covered by one power converter is distributed as a threshold value. Vc (n) is used for the determination. Here, the upper limit value of Vc (n) is Vcth1, and the lower limit value of Vc (n) is Vcth2. Vcth2 is defined by the input voltage Vac, and Vcth1 is defined by the output voltage.

  The distribution priority setting unit step S100 in FIG. 28 is the same as that in the second embodiment, and a description thereof will be omitted. In step S700, it is confirmed whether Vc (n) is greater than or equal to a threshold value Vcth1. In this embodiment, it is assumed that power is equally distributed to each power converter 101n, and that each Vc (n) is ideally in the same state. If it is determined in step S700 that Vc (n) is greater than or equal to the threshold value Vcth1, the process proceeds to step S701. In step S701, it is determined whether or not the current distribution number N is three. If the current distribution number N is 3 in step S701, the subsequent processing is terminated without being executed. If the current distribution number N is not 3 in step S701, the process proceeds to step S702, and the current distribution number N is increased by one.

  If it is determined in step S700 that Vc (n) is less than the threshold value Vcth1, the process proceeds to step S703. In step S703, it is confirmed whether Vc (n) is equal to or less than a threshold value Vcth2. If it is determined in step S703 that Vc (n) is equal to or less than the threshold value Vcth2, the process proceeds to step S704. If it is determined in step S703 that Vc (n) is greater than the threshold value Vcth2, the subsequent processing is terminated without being performed. In step S704, it is determined whether or not the current distribution number N is one. If the current distribution number N is 1 in step S704, the process is terminated without performing the subsequent processing. If the current distribution number N is not 1 in step S704, the process proceeds to step S705, and the current distribution number N is decreased by one.

  After step S702 and step S705, the process proceeds to step S706. In step S706, it is confirmed whether or not the distribution number N is three. If the distribution number N is 3 in step S706, the process proceeds to step S205. If the distribution number N is not 3 in step S706, the process proceeds to step S707. In step S707, it is confirmed whether the distribution number N is 1. If the distribution number N is 1 in step S707, the process proceeds to step S207. If the distribution number N is not 1 in step S707, the process proceeds to step S206. Since the subsequent processing is the same as that of the first embodiment, the description thereof is omitted.

  In this embodiment, the determination is made based on whether or not Vcth1, Vcth2 is equal to or greater than or less than Vcth1, but it may be determined whether the above or less is continued for a predetermined time. Although the monitor value is used here, a target value may be used. In this embodiment, power is distributed evenly to each power converter. However, a predetermined ratio or maximum power of the power converter is used as much as possible. It may be in the form of being distributed to.

As described above, when the output current flowing to each power converter that can reduce power loss can be expected by increasing the number of distributions that distribute output power, or when the number of distributions that distribute output power increases, Whether the output current flowing to each power converter that is concerned about increase is less than a predetermined value is judged by the output voltage of the AC / DC unit, and the power loss can be reduced by increasing the number of distribution of output power. If the output current flowing to each power converter exceeds a predetermined value, increase the number of distributions to be operated and increase the number of distributions to distribute the output power to increase the power loss. Is less than a predetermined value, the power conversion efficiency can be increased by reducing the number of distributions that can be expected to be greater than or equal to the predetermined value.
When the output current exceeds a predetermined value, the power conversion efficiency can be increased, the heat load on each component can be reduced, and the occurrence of deterioration and failure can be reduced.
Moreover, by using it preferentially from a power converter with a short charging time, it is possible to suppress a load from being concentrated on a specific power converter, and to maintain a long life of the power converter.

Embodiment 8 FIG.
Since the distributed power determination unit (130) of the in-vehicle power conversion device according to Embodiment 8 of the present invention uses the internal calculation value of the power conversion control unit, the description of the block diagram of the power conversion control unit is omitted. Since the entire configuration of the in-vehicle power conversion device 100 according to the eighth embodiment is the same as that of the above-described embodiment, the description thereof is omitted.

  The power conversion control unit 20 in this embodiment includes an intermediate voltage monitor unit (a) 127a, an intermediate voltage monitor unit (b) 127b, an intermediate voltage monitor unit (c) 127 (c) shown in FIG. 27 of the seventh embodiment. Instead of the output of, DCDC duty obtained from the control calculation result is used. The distributed power determination unit (130) determines how to distribute power to the power converters 101a to 101c configured in parallel according to the calculation result of the DCDC duty.

  FIG. 29 is a schematic flowchart showing the processing of the distributed power determination unit (130). As described above, DCDC duty (n) is determined according to the target current Ibat * of the DC / DC unit 104. Basically, the target of DCDC duty (n) is fixed, and Ibat is controlled by adjusting Vc (n). The DCDC duty (n) is set to the target value 1 in the above description, but is actually set to a value slightly lower than 1 in order to provide controllability. Therefore, when the control range of Vc (n) is exceeded and Ibat * varies, DCDC duty (n) varies.

  When DCDC duty (n) exceeds the target value and sticks at the upper limit, there is a possibility that Ibat cannot be supplied with the number of distributions being operated. Further, when DCDC duty (n) falls below the target value and sticks at the lower limit, there is a possibility that Ibat is supplied too much for the number of distributions being operated.

  As described above, when Ibat is large, increasing the number of distributions is also efficient. Further, when Ibat is small, it is more efficient to reduce the number of distributions. In this embodiment, power that can be covered by one power converter is distributed as a threshold value. It is assumed that DCDC duty (n) is used for the determination. Here, the upper limit value of DCDC duty (n) is Dth1, and the lower limit value of DCDC duty (n) is Dth2.

  In FIG. 29, the distribution priority setting unit step S100 is the same as that of the seventh embodiment, and thus the description thereof is omitted. In step S708, it is confirmed whether or not DCDC duty (n) is greater than or equal to a threshold value Dth1. In this embodiment, it is assumed that power is evenly distributed to each power converter 101 and that each DCDC duty (n) is ideally in the same state.

  If it is determined in step S708 that DCDC duty (n) is equal to or greater than the threshold Dth1, the process proceeds to step S701. If it is determined in step S708 that DCDC duty (n) is less than the threshold value Dth1, the process proceeds to step S709. In step S709, it is confirmed whether or not DCDC duty (n) is equal to or less than a threshold value Dth2. If it is determined in step S709 that DCDC duty (n) is equal to or less than the threshold value Dth2, the process proceeds to step S704. Since the subsequent processing is the same as that of the seventh embodiment, description thereof is omitted.

  In this embodiment, the determination is made based on whether or not it is greater than or less than Dth1, Dth2, but it is also possible to determine a state in which this or more or less continues for a predetermined time. In this embodiment, power is distributed evenly to each power converter. However, a predetermined ratio or maximum power of the power converter is used as much as possible. It may be in the form of being distributed to.

As described above, when the output current flowing to each power converter that can reduce power loss can be expected by increasing the number of distributions that distribute output power, or when the number of distributions that distribute output power increases, Decrease the power loss by increasing the number of distribution of output power by judging whether the output current flowing to each power converter that is concerned about the increase is less than a predetermined value based on the duty of the switching element of the DC / DC unit When the output current flowing to each power converter that can be expected exceeds a predetermined value, the number of distributions to be operated is increased, and the number of distributions for distributing output power is increased to flow to each power converter that is concerned about an increase in power loss. When the output current is less than a predetermined value, the power conversion efficiency can be increased by reducing the number of distributions to be able to expect a predetermined value or more.
When the output current exceeds a predetermined value, the power conversion efficiency can be increased, the heat load on each component can be reduced, and the occurrence of deterioration and failure can be reduced.
Moreover, by using it preferentially from a power converter with a short charging time, it is possible to suppress a load from being concentrated on a specific power converter, and to maintain a long life of the power converter.

Embodiment 9 FIG.
FIG. 30 is a schematic block diagram of a power conversion control unit of an in-vehicle power conversion device according to Embodiment 9 of the present invention. Since the overall configuration of the in-vehicle power conversion device 100 according to the ninth embodiment is the same as that of the above-described embodiment, the description thereof is omitted.
The power conversion control unit 20 in this embodiment is obtained by changing the distributed power determination unit 130 of the power conversion control unit 20 of FIG. 4 shown in the first embodiment as a distributed power determination unit 130G as follows.

  In addition to the output of the current target value setting unit 140 of the first embodiment, the power conversion control unit 20 in this embodiment includes each temperature sensor (a) monitor unit 180a of three temperature sensors (not shown), The outputs of the temperature sensor (b) monitor unit 180b and the temperature sensor (c) monitor unit 180c are input to the distributed power determination unit 130G. The distributed power determination unit 130G distributes the power to the power converters 101a to 101c configured in parallel according to the measurement results of the output of the current target value setting unit 140 and the outputs of the temperature sensor monitor units 180a to 180c. To decide.

  Here, a temperature sensor (not shown) is attached to a location where heat generation due to the above-described loss is a concern, such as the transformer T1n or the switching element S2n of the DC / DC unit 104, for example. In this embodiment, one temperature sensor output is received from each of the power converters 101a to 101c. In the case of a plurality of cases, the maximum value or the temperature at the place of greatest concern is used for distribution determination.

  FIG. 31 is a schematic flow showing the process of the distributed power determination unit 130G. Since the distribution priority setting unit step S100 is the same as that of the first embodiment, the description thereof is omitted. FIG. 32 is a schematic flowchart showing an outline of the processing of the distribution number limiting unit step S600 of FIG. In step S607 of FIG. 32, it is confirmed whether or not the temperature of Pr1 set in step S100 is higher than a predetermined value Teth. Here, Teth is a temperature at which a failure of the temperature measurement unit or a significant increase in loss = a concern about deterioration in efficiency. If it is determined in step S607 that the temperature Te (Pr1) of Pr1 is equal to or lower than the threshold value Teth, the process proceeds to step S611. If it is determined in step S607 that the temperature Te (Pr1) of Pr1 is higher than the threshold value Teth, the process proceeds to step S608.

  In step S608, it is confirmed whether the temperature of Pr2 set in step S100 is higher than a predetermined value Teth. If it is determined in step S608 that the temperature Te (Pr2) of Pr2 is equal to or lower than the threshold value Teth, the process proceeds to step S610. If it is determined in step S608 that the temperature Te (Pr2) of Pr2 is higher than the threshold value Teth, the process proceeds to step S609.

  In step S609, it is confirmed whether the temperature of Pr3 set in step S100 is higher than a predetermined value Teth. If it is determined in step S609 that the temperature Te (Pr3) of Pr3 is equal to or lower than the threshold value Teth, the process proceeds to step S614. In step S614, the one having no problem with the temperature is given first priority, and then Pr1 to Pr3 are reset so that the priority order determined in step S100 is obtained. Thereafter, the process proceeds to step S605, where it is determined that there is one power converter with a sufficient temperature, and the distribution limit number Nmax = 1 is set. If it is determined in step S609 that the temperature Te (Pr3) of Pr2 is higher than the threshold value Teth, the process proceeds to step S606. In step S606, all the power converters 101a to 101c determine that the temperature is severe, and set the distribution limit number Nmax = 0 so that the power conversion operation is stopped.

  In step S610, it is confirmed whether the temperature of Pr3 set in step S100 is higher than a predetermined value Teth. If it is determined in step S610 that the temperature Te (Pr3) of Pr3 is equal to or lower than the threshold value Teth, the process proceeds to step S616. In step S616, the temperature having no problem is given first priority, and then Pr1 to Pr3 are reset so that the priority order determined in step S100 is obtained. Thereafter, the process proceeds to step S604, where it is determined that there are two power converters having a sufficient temperature, and the distribution limit number Nmax = 2 is set. If it is determined in step S610 that the temperature Te (Pr3) of Pr3 is higher than the threshold value Teth, the process proceeds to step S615. In step S615, priority is given to those having no problem with temperature, and then Pr1 to Pr3 are reset so that the priority order determined in step S100 is obtained. Thereafter, the process proceeds to step S605, where it is determined that there is one power converter with a sufficient temperature, and the distribution limit number Nmax = 1 is set.

  In step S611, it is confirmed whether the temperature of Pr2 set in step S100 is higher than a predetermined value Teth. If it is determined in step S611 that the temperature Te (Pr2) of Pr2 is equal to or lower than the threshold value Teth, the process proceeds to step S613. If it is determined in step S611 that the temperature Te (Pr2) of Pr2 is higher than the threshold value Teth, the process proceeds to step S612. In step S612, it is confirmed whether the temperature of Pr3 set in step S100 is higher than a predetermined value Teth. If it is determined in step S612 that the temperature Te (Pr3) of Pr2 is equal to or lower than the threshold value Teth, the process proceeds to step S618. In step S618, priority is given to those having no problem with temperature, and then Pr1 to Pr3 are reset so that the priority order determined in step S100 is reached. Thereafter, the process proceeds to step S604, where it is determined that there are two power converters having a sufficient temperature, and the distribution limit number Nmax = 2 is set.

  If it is determined in step S612 that the temperature Te (Pr3) of Pr2 is higher than the threshold value Teth, the process proceeds to step S617. In step S617, priority is given to those having no problem with temperature, and then Pr1 to Pr3 are reset so that the priority order determined in step S100 is obtained. Thereafter, the process proceeds to step S605, where it is determined that there is one power converter with a sufficient temperature, and the distribution limit number Nmax = 1 is set.

  In step S613, it is confirmed whether the temperature of Pr3 set in step S100 is higher than a predetermined value Teth. If it is determined in step S613 that the temperature Te (Pr3) of Pr3 is equal to or lower than the threshold value Teth, the process proceeds to step S620. In step S620, the temperature having no problem is given first priority, and then Pr1 to Pr3 are reset so that the priority order determined in step S100 is obtained. Thereafter, the process proceeds to step S603, where it is determined that there are three power converters having a sufficient temperature, and the distribution limit number Nmax = 3 is set.

  If it is determined in step S613 that the temperature Te (Pr3) of Pr3 is higher than the threshold value Teth, the process proceeds to step S619. In step S619, priority is given to those having no problem with temperature, and then Pr1 to Pr3 are reset so that the priority order determined in step S100 is obtained. Thereafter, the process proceeds to step S604, where it is determined that there are two power converters having a sufficient temperature, and the distribution limit number Nmax = 2 is set.

  Here, it is not confirmed whether or not the input power PacRMS = IacRMS × VacRMS is within the maximum power Pmn × n allowable in each power converter, but if the temperature is high, the number of distributions is reduced even if the output power is lowered. Assumption. For this reason, if the number of operations is small and the power does not fall within the maximum power Pmn × n allowable in each power converter, the output power is limited from the target value when setting the target value in each power converter.

  Returning to FIG. 31, in step S307, it is determined whether Nmax = 0. If Nmax = 0 in step S307, the process proceeds to step S211. In step S211, the distribution number N = 0 (power conversion stopped), and in step S212, the relay 106n of the power converter is turned OFF. If Nmax = 0 is not satisfied in step S307, the process proceeds to step S305. The subsequent processing is the same as that of the sixth embodiment shown in FIG.

  In this embodiment, the power converter with no margin for temperature is stopped and is carried by another power converter, but the power converter with no margin for temperature is not stopped and is smaller than other power converters. It is good also as operating with electric power.

As described above, if the output current flowing to each power converter that can reduce power loss is expected to increase by increasing the number of distributions for distributing output power, the number of distributions to be operated is increased and the number of distributions for distributing output power. If the output current flowing to each power converter that is concerned about an increase in power loss is less than a predetermined value, the power conversion efficiency can be increased by reducing the number of distributions where the output current can be more than the predetermined value. In addition, the influence of heat on peripheral components can be reduced.
When the output current exceeds a predetermined value, the power conversion efficiency can be increased, the heat load on each component can be reduced, and the occurrence of deterioration and failure can be reduced.
Moreover, it can suppress that a load concentrates on a specific power converter by using from a power converter with few frequency | counts of charging, and can maintain the lifetime of a power converter device long.
In addition, considering the temperature of each power converter and using it preferentially from the one with a margin of temperature, it is possible to reduce deterioration of the components due to temperature and deterioration of efficiency.

Embodiment 10 FIG.
Since the schematic block diagram of the power conversion control part of the vehicle-mounted power converter according to Embodiment 10 of the present invention is the same as that of Embodiment 9, it is omitted. Moreover, since the whole structure of the vehicle-mounted power converter device 100 according to the tenth embodiment is the same as that of the above embodiment, the description thereof is omitted.

  FIG. 33 is a schematic flowchart showing the processing of the distributed power determination unit (130). The distribution priority setting unit step S100 is obtained by changing the first embodiment as follows. First, in step S100, the temperatures Te (a), Te (b), and Te (c) of the respective power converters 101a to 101c are confirmed and assigned to Pr1, Pr2, and Pr3 from the lowest temperature. The general flow of step S100 is as shown in FIG. In FIG. 34, in step S801, it is confirmed whether Te (a) is smaller than Te (b). If Te (a) is smaller than Te (b), the process proceeds to step S802. In step S802, it is confirmed whether Te (a) is smaller than Te (c). If Te (a) is smaller than Te (c), the process proceeds to step S803. In step S803, it is confirmed whether Te (b) is smaller than Te (c). If Te (a) is smaller than Te (c), the process proceeds to step S804. In step S804, the priority is increased from the one with the lower temperature (Te (a) <Te (b) <Te (c)), the first priority Pr1 = Te (a), and the second priority Pr2 = Te. (b) Set priority No. 3 Pr3 = Te (c). Similarly, Pr1, Pr2, and Pr3 are set in ascending order of temperature Te (N), and the process proceeds to step S900.

  FIG. 35 is a schematic flow diagram showing an outline of the processing of the distribution rate setting unit S900. In FIG. 35, in step S901, the distribution rate when the distribution number N = 1 is assumed is calculated. When the distribution number N = 1, the total power is output by one distributor, so that the power distribution ratio R (11) = 1 of Pr1.

In step S902, the distribution rate when the distribution number N = 2 is assumed is calculated. In the case of the distribution number N = 2, in order to output the total power with two distributors, for example, the distribution ratio is calculated so that Pr1 is larger than the absolute temperature of the power converters of Pr1 and Pr2 as follows: .
Pr1 power distribution ratio R (21) = Te (Pr2) / (Te (Pr1) + Te (Pr2))
Pr2 power distribution ratio R (22) = Te (Pr1) / (Te (Pr1) + Te (Pr2))

In step S903, the distribution rate when the distribution number N = 3 is assumed is calculated. When the distribution number N = 3, the total power is output by three distributors. For example, the distribution ratio is set so that Pr1 is larger than the absolute temperatures of the power converters Pr1, Pr2, and Pr3 as follows. Calculate.
Pr1 power distribution ratio R (31) = Te (Pr3) / (Te (Pr1) + Te (Pr2) + Te (Pr3))
Pr2 power distribution ratio R (32) = Te (Pr2) / (Te (Pr1) + Te (Pr2) + Te (Pr3))
Power distribution ratio R (32) of Pr3 = Te (Pr1) / (Te (Pr1) + Te (Pr2) + Te (Pr3))

  Although the absolute temperature is used here, for example, a difference from Teth used in Embodiment 9 may be used.

  Returning to FIG. 33, in step S220, it is determined whether or not the smallest distribution rate R (33) × Ibat when the distribution number N calculated in step S900 is 3 is equal to or greater than lot. If it is determined in step S220 that the distribution ratio R (33) × Ibat is equal to or greater than lot, the process proceeds to step S202. If it is determined in step S220 that the distribution ratio R (33) × Ibat is less than the lot, the process proceeds to step S221.

  In step S221, it is determined whether or not the smallest distribution rate R (22) × Ibat when the distribution number N = 2 calculated in step S900 is equal to or greater than lot. If it is determined in step S221 that the distribution ratio R (22) × Ibat is equal to or greater than lot, the process proceeds to step S203. If it is determined in step S221 that the distribution ratio R (22) × Ibat is less than the lot, the process proceeds to step S204. Steps S202 to 207 are the same as those in the first embodiment, and a description thereof will be omitted.

  In step S230, the power distribution ratio to each power converter assuming that the distribution number N = 3 is set to R (Pr1), R (Pr2), and R (Pr3) as normal distribution ratios. In step S231, the power distribution ratio to each power converter when the distribution number N = 2 is assumed is set to R (Pr1) and R (Pr2) as normal distribution ratios. R (Pr3) is 0. In step S232, the power distribution ratio to each power converter assuming that the distribution number N = 1 is set to R (Pr1) as a normal distribution ratio. R (Pr2) and R (Pr3) are set to 0.

  After the distributed power determination unit (130) ends, the control target value calculation unit 160 of each power converter is executed. The control target value calculation unit 160 of each power converter controls each power converter according to the distribution number N set by the distribution power determination unit 130 and Pr1 to Pr3 and R (Pr1) to R (Pr3). Set the target value. Thereby, the output power of each power converter is determined.

As described above, if the output current flowing to each power converter that can reduce power loss is expected to increase by increasing the number of distributions for distributing output power, the number of distributions to be operated is increased and the number of distributions for distributing output power. If the output current flowing to each power converter that is concerned about an increase in power loss is less than a predetermined value, the power conversion efficiency can be increased by reducing the number of distributions where the output current can be more than the predetermined value. In addition, the influence of heat on peripheral components can be reduced.
When the output current exceeds a predetermined value, the power conversion efficiency can be increased, the heat load on each component can be reduced, and the occurrence of deterioration and failure can be reduced.
Moreover, it can suppress that a load concentrates on a specific power converter by using from a power converter with few frequency | counts of charging, and can maintain the lifetime of a power converter device long.
Furthermore, considering the temperature of each power converter and preferentially distributing power from those with sufficient temperature, deterioration of components due to temperature and deterioration of efficiency can be reduced.

Embodiment 11 FIG.
In the eleventh embodiment of the present invention, the distribution priority setting unit S100 in the first to tenth embodiments is changed as follows. A schematic block diagram of the power conversion control unit is omitted. Moreover, since the whole structure of the vehicle-mounted power converter device 100 according to the eleventh embodiment is the same as that of the above embodiment, the description thereof is omitted.

In the distribution priority setting unit S100 in this embodiment, the efficiency E (a), E (b), E (c) of each of the power converters 101a to 101c is confirmed, and Pr1, Pr2, Assign to Pr3. Efficiency can be calculated by the following equation.
E (n) = (Vbat × Io (n)) / (Vac × Ii (n))
As described above, the efficiency depends on the loss of each power converter. However, this loss varies depending on temperature conditions and individual differences of parts in addition to the current-dependent and voltage-dependent operating conditions described above. Therefore, in this embodiment, the efficiency is calculated according to the above-described formula, and a priority is given when power is distributed to each power converter.

  The general flow of step S100 is as shown in FIG. In FIG. 36, in step S911, it is confirmed whether E (a) is equal to or greater than E (b). If E (a) is equal to or greater than E (b), the process proceeds to step S802. In step S912, it is confirmed whether E (a) is equal to or greater than E (c). If E (a) is equal to or greater than E (c), the process proceeds to step S803. In step S913, it is confirmed whether E (b) is equal to or greater than E (c). If E (a) is equal to or greater than E (c), the process proceeds to step S804. In step S104, the priority order is increased from the one with the highest efficiency (E (a) ≧ E (b) ≧ E (c)), the priority order 1 Pr1 = E (a), and the priority order 2 Pr2 = E. (b) Set priority number 3 Pr3 = E (c). Similarly, Pr1, Pr2, and Pr3 are set in ascending order of efficiency E (N), and the process proceeds to the next step.

  In this embodiment, as in the other embodiments, it has been described as a configuration in which priority is given each time.However, when only individual variations in efficiency are seen, calculation is performed at the time of shipment of the power converter, and the result It may be a method of holding.

  According to the above, it is possible to preferentially operate from a power converter with high efficiency, and it is possible to operate as a power converter with high efficiency in consideration of individual variations and the like.

  In addition, this invention is not limited to said each embodiment, All these combinations are included.

  DESCRIPTION OF SYMBOLS 10 AC power supply device, 11 Motor generator, 12 Inverter, 20 Power conversion control part, 21 Input voltage measurement part, 22 Input current measurement part, 23 Power conversion unit, 24 Output voltage measurement part, 25 Output current measurement part, 90 Control Value calculation unit, 100 power conversion device, 101n AC-DC power converter, 102n first current measurement unit (current sensor), 103n AC-DC power conversion unit (AC / DC unit), 104n DC-DC power conversion unit (DC / DC section), 105n second current measuring section (current sensor), 106n relay, 108 driving battery, 121 input voltage monitoring section, 122 input current monitoring section, 123 output voltage monitoring section, 124 output current monitoring section 125a-c first current monitor unit, 126a-c second current monitor unit, 127a-c intermediate voltage monitor unit, 130- 130G distributed power determination unit, 140 current target value setting unit, 151a-c AC / DC control unit, 152a-c DC / DC control unit, 153a-c relay control unit, 160 control target value calculation unit, 170 charge mode determination unit 180a-c Temperature sensor monitor unit, 201n rectifier circuit, 202n switching circuit, 203n voltage sensor, 301n switching circuit, 302n rectifier circuit, 303n snubber circuit, S100 distribution priority setting unit, S600 distribution number limiting unit, S900 distribution rate setting Department.

Claims (42)

A power conversion unit connected between the AC power supply device and the load, and converting AC power from the AC power supply device into DC power of the voltage of the load;
An input voltage measuring unit that measures a voltage input from the AC power supply device to the power conversion unit;
An output voltage measurement unit for measuring a voltage supplied from the power conversion unit to the load;
An input current measuring unit for measuring a current input from the AC power supply device to the power converter unit;
An output current measuring unit for measuring a current supplied from the power conversion unit to the load;
A power conversion control unit that controls the power conversion unit based on a measurement result of at least one of the measurement units;
With
The power conversion unit is
AC composed of an AC-DC power converter that converts the AC power into DC having a predetermined potential, and a DC-DC power converter that converts the output of the AC-DC power converter into predetermined output power. -Consists of multiple DC power converters connected in parallel ,
The power conversion control unit sets a control target value of the input current for controlling the input current and a control target value of the output current for controlling the output current,
The power conversion control unit
The power conversion device includes a distribution power determination unit that determines distribution of power converted from the AC power supply device to the load to a plurality of AC-DC power converters, and the distribution power determination unit is configured to measure the output current. According to the measurement result of the output current of the unit or the control target value of the output current, the power is distributed to each of the plurality of AC-DC power converters at a ratio including 0,
The power converter characterized by the above-mentioned. A power conversion unit connected between the AC power supply device and the load, and converting AC power from the AC power supply device into DC power of the voltage of the load;
An input voltage measuring unit that measures a voltage input from the AC power supply device to the power conversion unit;
An output voltage measurement unit for measuring a voltage supplied from the power conversion unit to the load;
An input current measuring unit for measuring a current input from the AC power supply device to the power converter unit;
An output current measuring unit for measuring a current supplied from the power conversion unit to the load;
A power conversion control unit that controls the power conversion unit based on a measurement result of at least one of the measurement units;
With
The power conversion unit is
AC composed of an AC-DC power converter that converts the AC power into DC having a predetermined potential, and a DC-DC power converter that converts the output of the AC-DC power converter into predetermined output power. -Consists of multiple DC power converters connected in parallel ,
The power conversion control unit sets a control target value of the input current for controlling the input current and a control target value of the output current for controlling the output current,
The power conversion control unit
The power conversion device includes a distribution power determination unit that determines distribution of power converted from the AC power supply device to the load to a plurality of AC-DC power converters, and the distribution power determination unit is configured to measure the input current. According to the measurement result of the input current of the unit or the control target value of the input current, the power is distributed to each of the plurality of AC-DC power converters at a ratio including 0,
The power converter characterized by the above-mentioned. A power conversion unit connected between the AC power supply device and the load, and converting AC power from the AC power supply device into DC power of the voltage of the load;
An input voltage measuring unit that measures a voltage input from the AC power supply device to the power conversion unit;
An output voltage measurement unit for measuring a voltage supplied from the power conversion unit to the load;
An input current measuring unit for measuring a current input from the AC power supply device to the power converter unit;
An output current measuring unit for measuring a current supplied from the power conversion unit to the load;
A power conversion control unit that controls the power conversion unit based on a measurement result of at least one of the measurement units;
With
The power conversion unit is
AC composed of an AC-DC power converter that converts the AC power into DC having a predetermined potential, and a DC-DC power converter that converts the output of the AC-DC power converter into predetermined output power. -Consists of multiple DC power converters connected in parallel ,
The power conversion control unit sets a control target value of the input current for controlling the input current and a control target value of the output current for controlling the output current,
The power conversion control unit
A distribution power determination unit that determines distribution of power that the power conversion device converts from the AC power supply device to the load to a plurality of AC-DC power converters;
The power conversion control unit includes two or more power conversion modes, and includes a charge mode determination unit for switching the power conversion mode,
The distributed power determination unit distributes power at each ratio including 0 to each of the plurality of AC-DC power converters according to the power conversion mode.
The power converter characterized by the above-mentioned. A power conversion unit connected between the AC power supply device and the load, and converting AC power from the AC power supply device into DC power of the voltage of the load;
An input voltage measuring unit that measures a voltage input from the AC power supply device to the power conversion unit;
An output voltage measurement unit for measuring a voltage supplied from the power conversion unit to the load;
An input current measuring unit for measuring a current input from the AC power supply device to the power converter unit;
An output current measuring unit for measuring a current supplied from the power conversion unit to the load;
A power conversion control unit that controls the power conversion unit based on a measurement result of at least one of the measurement units;
With
The power conversion unit is
AC composed of an AC-DC power converter that converts the AC power into DC having a predetermined potential, and a DC-DC power converter that converts the output of the AC-DC power converter into predetermined output power. -Consists of multiple DC power converters connected in parallel ,
The power conversion control unit sets a control target value of the input current for controlling the input current and a control target value of the output current for controlling the output current,
The power conversion control unit
A distribution power determination unit that determines distribution of power that the power conversion device converts from the AC power supply device to the load to a plurality of AC-DC power converters;
The distributed power determination unit
Input power measurement result of the input current measurement unit, input power obtained by calculation of the input voltage measurement result of the input voltage measurement unit, or a control target value of the input current, and input voltage of the input voltage measurement unit In accordance with the control target value of the input power obtained by the calculation of the measurement results of, the power is distributed to each of the plurality of AC-DC power converters at a ratio including 0,
The power converter characterized by the above-mentioned. A power conversion unit connected between the AC power supply device and the load, and converting AC power from the AC power supply device into DC power of the voltage of the load;
An input voltage measuring unit that measures a voltage input from the AC power supply device to the power conversion unit;
An output voltage measurement unit for measuring a voltage supplied from the power conversion unit to the load;
An input current measuring unit for measuring a current input from the AC power supply device to the power converter unit;
An output current measuring unit for measuring a current supplied from the power conversion unit to the load;
A power conversion control unit that controls the power conversion unit based on a measurement result of at least one of the measurement units;
With
The power conversion unit is
AC composed of an AC-DC power converter that converts the AC power into DC having a predetermined potential, and a DC-DC power converter that converts the output of the AC-DC power converter into predetermined output power. -Consists of multiple DC power converters connected in parallel ,
The power conversion control unit sets a control target value of the input current for controlling the input current and a control target value of the output current for controlling the output current,
The power conversion control unit
A distribution power determination unit that determines distribution of power that the power conversion device converts from the AC power supply device to the load to a plurality of AC-DC power converters;
The distributed power determination unit
The output current obtained by calculating the output current measurement result of the output current measurement unit and the output voltage measurement result of the output voltage measurement unit, or the control target value of the output current, and the output voltage of the output voltage measurement unit In accordance with the control target value of the output power obtained by the calculation of the measurement result, the power is distributed to each of the plurality of AC-DC power converters at a ratio including 0,
The power converter characterized by the above-mentioned. A power conversion unit connected between the AC power supply device and the load, and converting AC power from the AC power supply device into DC power of the voltage of the load;
An input voltage measuring unit that measures a voltage input from the AC power supply device to the power conversion unit;
An output voltage measurement unit for measuring a voltage supplied from the power conversion unit to the load;
An input current measuring unit for measuring a current input from the AC power supply device to the power converter unit;
An output current measuring unit for measuring a current supplied from the power conversion unit to the load;
A power conversion control unit that controls the power conversion unit based on a measurement result of at least one of the measurement units;
With
The power conversion unit is
AC composed of an AC-DC power converter that converts the AC power into DC having a predetermined potential, and a DC-DC power converter that converts the output of the AC-DC power converter into predetermined output power. -Consists of multiple DC power converters connected in parallel ,
The power conversion control unit sets a control target value of the input current for controlling the input current and a control target value of the output current for controlling the output current,
The power conversion control unit
A distribution power determination unit that determines distribution of power that the power conversion device converts from the AC power supply device to the load to a plurality of AC-DC power converters;
The distributed power determination unit distributes power at each ratio including 0 to each of the plurality of AC-DC power converters according to the measurement result of the input voltage of the input voltage measurement unit.
The power converter characterized by the above-mentioned. A power conversion unit connected between the AC power supply device and the load, and converting AC power from the AC power supply device into DC power of the voltage of the load;
An input voltage measuring unit that measures a voltage input from the AC power supply device to the power conversion unit;
An output voltage measurement unit for measuring a voltage supplied from the power conversion unit to the load;
An input current measuring unit for measuring a current input from the AC power supply device to the power converter unit;
An output current measuring unit for measuring a current supplied from the power conversion unit to the load;
A power conversion control unit that controls the power conversion unit based on a measurement result of at least one of the measurement units;
With
The power conversion unit is
AC composed of an AC-DC power converter that converts the AC power into DC having a predetermined potential, and a DC-DC power converter that converts the output of the AC-DC power converter into predetermined output power. -Consists of multiple DC power converters connected in parallel ,
The power conversion control unit sets a control target value of the input current for controlling the input current and a control target value of the output current for controlling the output current,
The power conversion control unit
A distribution power determination unit that determines distribution of power that the power conversion device converts from the AC power supply device to the load to a plurality of AC-DC power converters;
The distributed power determination unit distributes power at each ratio including 0 to each of the plurality of AC-DC power converters according to the measurement result of the output voltage of the output voltage measurement unit.
The power converter characterized by the above-mentioned. A power conversion unit connected between the AC power supply device and the load, and converting AC power from the AC power supply device into DC power of the voltage of the load;
An input voltage measuring unit that measures a voltage input from the AC power supply device to the power conversion unit;
An output voltage measurement unit for measuring a voltage supplied from the power conversion unit to the load;
An input current measuring unit for measuring a current input from the AC power supply device to the power converter unit;
An output current measuring unit for measuring a current supplied from the power conversion unit to the load;
A power conversion control unit that controls the power conversion unit based on a measurement result of at least one of the measurement units;
With
The power conversion unit is
AC composed of an AC-DC power converter that converts the AC power into DC having a predetermined potential, and a DC-DC power converter that converts the output of the AC-DC power converter into predetermined output power. -Consists of multiple DC power converters connected in parallel ,
The power conversion control unit sets a control target value of the input current for controlling the input current and a control target value of the output current for controlling the output current,
The power conversion control unit
A distribution power determination unit that determines distribution of power that the power conversion device converts from the AC power supply device to the load to a plurality of AC-DC power converters;
The AC-DC power conversion unit includes an intermediate voltage measurement unit that measures a voltage output from the AC-DC power conversion unit, or a setting unit that sets a control target value of the intermediate voltage.
The distributed power determination unit is configured to measure each of the plurality of AC-DC power converters at a ratio including 0, depending on the measurement result of the intermediate voltage of the intermediate voltage measurement unit or the control target value of the intermediate voltage. Distribute power,
The power converter characterized by the above-mentioned. A power conversion unit connected between the AC power supply device and the load, and converting AC power from the AC power supply device into DC power of the voltage of the load;
An input voltage measuring unit that measures a voltage input from the AC power supply device to the power conversion unit;
An output voltage measurement unit for measuring a voltage supplied from the power conversion unit to the load;
An input current measuring unit for measuring a current input from the AC power supply device to the power converter unit;
An output current measuring unit for measuring a current supplied from the power conversion unit to the load;
A power conversion control unit that controls the power conversion unit based on a measurement result of at least one of the measurement units;
With
The power conversion unit is
AC composed of an AC-DC power converter that converts the AC power into DC having a predetermined potential, and a DC-DC power converter that converts the output of the AC-DC power converter into predetermined output power. -Consists of multiple DC power converters connected in parallel ,
The power conversion control unit sets a control target value of the input current for controlling the input current and a control target value of the output current for controlling the output current,
The power conversion control unit
A distribution power determination unit that determines distribution of power that the power conversion device converts from the AC power supply device to the load to a plurality of AC-DC power converters;
The DC-DC power conversion unit includes a switching circuit including a plurality of switching elements for performing power conversion control,
The power conversion control unit controls the switching element,
The distribution power determination unit distributes power at each ratio including 0 to each of the plurality of AC-DC power converters according to the switching duty of the switching element of the DC-DC power conversion unit.
The power converter characterized by the above-mentioned. A power conversion unit connected between the AC power supply device and the load, and converting AC power from the AC power supply device into DC power of the voltage of the load;
An input voltage measuring unit that measures a voltage input from the AC power supply device to the power conversion unit;
An output voltage measurement unit for measuring a voltage supplied from the power conversion unit to the load;
An input current measuring unit for measuring a current input from the AC power supply device to the power converter unit;
An output current measuring unit for measuring a current supplied from the power conversion unit to the load;
A power conversion control unit that controls the power conversion unit based on a measurement result of at least one of the measurement units;
With
The power conversion unit is
AC composed of an AC-DC power converter that converts the AC power into DC having a predetermined potential, and a DC-DC power converter that converts the output of the AC-DC power converter into predetermined output power. -Consists of multiple DC power converters connected in parallel ,
The power conversion control unit sets a control target value of the input current for controlling the input current and a control target value of the output current for controlling the output current,
The power conversion control unit
A distribution power determination unit that determines distribution of power that the power conversion device converts from the AC power supply device to the load to a plurality of AC-DC power converters;
Each AC-DC power converter comprises at least one temperature sensor;
The distributed power determination unit distributes power at each ratio including 0 to each of the plurality of AC-DC power converters according to the measurement result of the temperature sensor.
The power converter characterized by the above-mentioned. A power conversion unit connected between the AC power supply device and the load, and converting AC power from the AC power supply device into DC power of the voltage of the load;
An input voltage measuring unit that measures a voltage input from the AC power supply device to the power conversion unit;
An output voltage measurement unit for measuring a voltage supplied from the power conversion unit to the load;
An input current measuring unit for measuring a current input from the AC power supply device to the power converter unit;
An output current measuring unit for measuring a current supplied from the power conversion unit to the load;
A power conversion control unit that controls the power conversion unit based on a measurement result of at least one of the measurement units;
With
The power conversion unit is
AC composed of an AC-DC power converter that converts the AC power into DC having a predetermined potential, and a DC-DC power converter that converts the output of the AC-DC power converter into predetermined output power. -Consists of multiple DC power converters connected in parallel ,
The power conversion control unit sets a control target value of the input current for controlling the input current and a control target value of the output current for controlling the output current,
The power conversion control unit
A distribution power determination unit that determines distribution of power that the power conversion device converts from the AC power supply device to the load to a plurality of AC-DC power converters;
The power conversion control unit measures the efficiency of each AC-DC power converter,
The distribution power determination unit distributes power at a ratio including each of 0, preferentially from an efficient AC-DC converter to a plurality of AC-DC power converters.
The power converter characterized by the above-mentioned. A power conversion unit connected between the AC power supply device and the load, and converting AC power from the AC power supply device into DC power of the voltage of the load;
An input voltage measuring unit that measures a voltage input from the AC power supply device to the power conversion unit;
An output voltage measurement unit for measuring a voltage supplied from the power conversion unit to the load;
An input current measuring unit for measuring a current input from the AC power supply device to the power converter unit;
An output current measuring unit for measuring a current supplied from the power conversion unit to the load;
A power conversion control unit that controls the power conversion unit based on a measurement result of at least one of the measurement units;
With
The power conversion unit is
AC composed of an AC-DC power converter that converts the AC power into DC having a predetermined potential, and a DC-DC power converter that converts the output of the AC-DC power converter into predetermined output power. -Consists of multiple DC power converters connected in parallel ,
The power conversion control unit sets a control target value of the input current for controlling the input current and a control target value of the output current for controlling the output current,
The power conversion control unit
A distribution power determination unit that determines distribution of power that the power conversion device converts from the AC power supply device to the load to a plurality of AC-DC power converters;
The power conversion control unit measures the total number of power conversions for each AC-DC power converter,
The distributed power determination unit distributes power to each of a plurality of AC-DC power converters in a ratio including each of 0, preferentially from an AC-DC power converter having a small total number of power conversions.
The power converter characterized by the above-mentioned. A power conversion unit connected between the AC power supply device and the load, and converting AC power from the AC power supply device into DC power of the voltage of the load;
An input voltage measuring unit that measures a voltage input from the AC power supply device to the power conversion unit;
An output voltage measurement unit for measuring a voltage supplied from the power conversion unit to the load;
An input current measuring unit for measuring a current input from the AC power supply device to the power converter unit;
An output current measuring unit for measuring a current supplied from the power conversion unit to the load;
A power conversion control unit that controls the power conversion unit based on a measurement result of at least one of the measurement units;
With
The power conversion unit is
AC composed of an AC-DC power converter that converts the AC power into DC having a predetermined potential, and a DC-DC power converter that converts the output of the AC-DC power converter into predetermined output power. -Consists of multiple DC power converters connected in parallel ,
The power conversion control unit sets a control target value of the input current for controlling the input current and a control target value of the output current for controlling the output current,
The power conversion control unit
A distribution power determination unit that determines distribution of power that the power conversion device converts from the AC power supply device to the load to a plurality of AC-DC power converters;
The power conversion control unit measures the total power conversion time of each AC-DC power converter,
The distributed power determination unit distributes power to each of the plurality of AC-DC power converters in a ratio including each of 0, preferentially from the AC-DC power converter having a short total power conversion time.
The power converter characterized by the above-mentioned. A power conversion unit connected between the AC power supply device and the load, and converting AC power from the AC power supply device into DC power of the voltage of the load;
An input voltage measuring unit that measures a voltage input from the AC power supply device to the power conversion unit;
An output voltage measurement unit for measuring a voltage supplied from the power conversion unit to the load;
An input current measuring unit for measuring a current input from the AC power supply device to the power converter unit;
An output current measuring unit for measuring a current supplied from the power conversion unit to the load;
A power conversion control unit that controls the power conversion unit based on a measurement result of at least one of the measurement units;
With
The power conversion unit is
AC composed of an AC-DC power converter that converts the AC power into DC having a predetermined potential, and a DC-DC power converter that converts the output of the AC-DC power converter into predetermined output power. -Consists of multiple DC power converters connected in parallel ,
The power conversion control unit sets a control target value of the input current for controlling the input current and a control target value of the output current for controlling the output current,
The power conversion control unit
A distribution power determination unit that determines distribution of power that the power conversion device converts from the AC power supply device to the load to a plurality of AC-DC power converters;
The power conversion control unit measures the total output power of each AC-DC power converter,
The distribution power determination unit distributes power to each of the plurality of AC-DC power converters in a ratio including each of 0 including, preferentially from an AC-DC power converter having a small total output power.
The power converter characterized by the above-mentioned. The AC-DC power converter includes at least one single-phase inverter having a switching circuit and a DC voltage source, and is of a gradation control type that superimposes the output voltage of the single-phase inverter on the voltage of AC power. power converter according to any one of claims 1 you wherein up to 14 that. Each AC - DC power converter comprises at least one temperature sensor, the distributor power determination unit in accordance with the measurement result of the temperature sensor, from claim 1, wherein the determining the power distributing 9 The power conversion device according to any one of the above. The power conversion control unit measures the efficiency of each AC-DC power converter,
17. The power conversion device according to claim 1, wherein the distributed power determination unit distributes power preferentially from an efficient AC-DC converter. When the output current distributed to each AC-DC power converter does not exceed a predetermined value from the measurement result of the output current of the output current measurement unit or the control target value of the output current, the distribution power determination unit If the output current distributed to each AC-DC power converter exceeds a predetermined value, the number of AC-DC power converters to be distributed is increased. The power conversion apparatus according to claim 1 . The power converter according to claim 18 , wherein the predetermined value is based on an output current command value to an external load. When the input current distributed to each AC-DC power converter exceeds a predetermined value from the measurement result of the input current of the input current measurement unit or the control target value of the input current, the distribution power determination unit, Limit the number of operating AC-DC power converters to be distributed, and increase the number of AC-DC power converters to be distributed when the input current distributed to each AC-DC power converter does not exceed a predetermined value The power conversion device according to claim 2 . The power conversion apparatus according to claim 20 , wherein the predetermined value is a limit value of the input current. The power converter according to claim 20 , wherein the predetermined value is a rated current of the power converter. When the output current distributed to each AC-DC power converter exceeds a predetermined value from the measurement result of the output current of the output current measuring unit or the control target value of the output current, the AC-DC power conversion to be distributed 21. The power conversion device according to claim 20 , wherein the number of operation of the device is not limited. 4. The power according to claim 3 , wherein the power conversion mode includes a constant current power conversion mode in which power conversion is performed with a predetermined output current and a constant power power conversion mode in which power conversion is performed with a predetermined output power. Conversion device. In the constant power conversion mode, the number of operating AC-DC power converters to be distributed is limited, and in the constant current power conversion mode, the number of operating AC-DC power converters to be distributed is increased. The power conversion device according to claim 24 . When the output current distributed to each AC-DC power converter exceeds a predetermined value from the measurement result of the output current of the output current measuring unit or the control target value of the output current, the AC-DC power conversion to be distributed The power conversion device according to claim 24 , wherein the number of operations of the device is not limited. The distributed power determination unit
Input power measurement result of the input current measurement unit, input power obtained by calculation of the input voltage measurement result of the input voltage measurement unit, or a control target value of the input current, and input voltage of the input voltage measurement unit If the input power control target value obtained by the calculation of the measurement results exceeds the predetermined value, the number of operations of the AC-DC power converter to be distributed is limited, and if the input power does not exceed the predetermined value, the distribution The power converter according to claim 4 , wherein the number of operations of the AC-DC power converter is increased. The power conversion apparatus according to claim 27 , wherein the predetermined value is a limit value of input power supplied from the AC power supply apparatus. 28. The power converter according to claim 27 , wherein the predetermined value is a rated power of the power converter. The distributed power determination unit
The output current obtained by calculating the output current measurement result of the output current measurement unit and the output voltage measurement result of the output voltage measurement unit, or the control target value of the output current, and the output voltage of the output voltage measurement unit If the output power distributed to each of the AC-DC power converters exceeds a predetermined value from the control target value of the output power obtained by the calculation of the measurement result, the number of operations of the AC-DC power converter to be distributed is 6. The power conversion device according to claim 5 , wherein the number of operations of the AC-DC power converter to be distributed is increased when the predetermined value is not exceeded. The power conversion apparatus according to claim 30 , wherein the predetermined value is a limit value of the input power. When the output current distributed to each AC-DC power converter exceeds a predetermined value from the measurement result of the output current of the output current measuring unit or the control target value of the output current, the AC-DC power conversion to be distributed 31. The power conversion device according to claim 30 , wherein the number of operation of the device is not limited. The distribution power determination unit reduces the number of operations of the AC-DC power converter to distribute when the AC power supply device is a 100V system, based on the measurement result of the input voltage of the input voltage measurement unit. The power conversion device according to claim 6 . The distribution power determination unit increases the number of AC-DC converters to be distributed when the AC power supply device is a 240 V system based on the measurement result of the input voltage of the input voltage measurement unit. The power conversion device according to claim 6 . The distributor power determination unit, the measurement result of the output voltage of the output voltage measuring unit is in the case of less than the predetermined value, the AC to distribute - according to claim 7, characterized in that to reduce the number of operation DC power converter Power conversion device. The distribution power determination unit limits the number of operations of the AC-DC power converter to be distributed when the measurement result of the intermediate voltage of the intermediate voltage measurement unit or the control target value of the intermediate voltage does not exceed a predetermined value. , the control target value of the measurement results of the intermediate voltage of the intermediate voltage measurement unit, or intermediate voltage, when exceeding a predetermined value, the AC to distribute - claim 8, characterized in that increasing the number of operation DC power converter The power converter device described in 1. The power converter according to claim 36 , wherein the predetermined value is defined by an input voltage. The power converter according to claim 36 , wherein the predetermined value is defined by an output voltage or a rated voltage of an output of the AC-DC power converter. When the switching duty of the DC-DC power converter does not exceed a predetermined value, the distributed power determination unit limits the number of operations of the AC-DC power converter to be distributed, and switches the DC-DC power converter. The power converter according to claim 9 , wherein when the duty exceeds a predetermined value, the number of operating AC / DC power converters to be distributed is increased. The distribution power determination unit stops the AC-DC power converter having at least one number of measurement results of the temperature sensor exceeding a predetermined value, and distributes to other AC-DC power converters. The power conversion device according to claim 10 . 11. The power conversion according to claim 10 , wherein the distribution power determination unit reduces power to be distributed to an AC-DC power converter having at least one measurement result of the temperature sensor exceeding a predetermined value. apparatus. The distribution power determination unit changes the distribution rate by increasing the distribution power of the AC-DC power converter having a low temperature and decreasing the power of the AC-DC power converter having a high temperature from the measurement result of the temperature sensor in each distribution. The power conversion device according to claim 10 .

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