JP2012125040A - Power conversion circuit system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a power conversion circuit system capable of preferably charging secondary batteries connected to each of a primary conversion circuit and a secondary conversion circuit by using an external AC power supply.SOLUTION: A power conversion circuit system 101 includes two input-output ports of a primary conversion circuit 20 and two input-output ports of a secondary conversion circuit 30 magnetically coupled to the primary conversion circuit 20, that is, four input-output ports in total. The power conversion circuit system 101 has: a secondary battery 55 connected to any one of input-output ports of the primary conversion circuit 20; a secondary battery 60 connected to any one of input-output ports of the secondary conversion circuit 30; an external AC power supply 78 connected to any one of the four input-output ports; and a control circuit 50 performing control so that at least one of the secondary battery 55 and the secondary battery 60 is charged with power input from the external AC power supply 78.

Description

  The present invention relates to a power conversion circuit system, and more particularly to a power conversion circuit system including a power conversion circuit having a plurality of input / output ports.

  In a power conversion circuit having a plurality of input / output ports, it may be desired to perform power conversion between two input / output ports of the plurality of input / output ports. For example, Patent Document 1 discloses a DC-DC converter circuit having three input / output ports and including a half bridge circuit. It is disclosed that a high-voltage inverter circuit, a 14v load, and a 42v load are connected to three input / output ports of the DC-DC converter circuit.

  Patent Document 2 discloses a DC-DC converter circuit having two input / output ports and including a full bridge circuit. And the said DC-DC converter circuit is provided with three reactors other than the reactor which comprises a transformer. Further, it is disclosed that a high voltage inverter circuit and a low voltage electronic device are connected to two input / output ports of the DC-DC converter circuit.

US Pat. No. 7,408,794 JP 2006-187147 A

  By the way, a total of four input / output ports including two input / output ports of the primary side conversion circuit and two input / output ports of the secondary side conversion circuit magnetically coupled to the primary side conversion circuit are included. In a power conversion circuit system including a power conversion circuit that performs power conversion between input and output ports, a secondary battery may be connected to each of the primary conversion circuit and the secondary conversion circuit. . In such a case, it is required that any of the secondary batteries can be charged using an external AC power source connected to any one of the four input / output ports.

  The objective of this invention is providing the power converter circuit system which charges suitably the secondary battery connected to each of a primary side converter circuit and a secondary side converter circuit using an external alternating current power supply.

  The power conversion circuit system according to the present invention has a total of four input / output ports including two input / output ports of the primary side conversion circuit and two input / output ports of the secondary side conversion circuit magnetically coupled to the primary side conversion circuit. A power conversion circuit system that performs power conversion between any two input / output ports including a port, and is connected to any one of the input / output ports of the primary side conversion circuit A secondary secondary battery connected to any one of the input / output ports of the secondary side conversion circuit, an external AC power source connected to any one of the remaining input / output ports, and an external AC power source And a controller that performs control to charge at least one of the primary side secondary battery and the secondary side secondary battery.

  Further, in the power conversion circuit system according to the present invention, the control unit converts the power input from the external AC power source to the primary side secondary battery and the secondary side secondary battery connected to the external AC power source. It is preferable to perform control so that the other secondary battery is charged through one secondary battery connected to the circuit.

  Moreover, in the power conversion circuit system according to the present invention, the power input from the external AC power source is connected to the conversion circuit to which the external AC power source is connected among the primary side secondary battery and the secondary side secondary battery. When charging one of the secondary batteries, it is preferable to include a temperature raising means for raising the temperature of the one secondary battery.

  In the power conversion circuit system according to the present invention, the primary conversion circuit includes a primary coil of a center tap transformer that magnetically couples the primary conversion circuit and the secondary conversion circuit, and a transformer A primary full-bridge circuit including a bridge portion having a primary-side magnetic coupling reactor configured by magnetically coupling two reactors connected to both ends of a primary-side coil, and a primary-side full-bridge circuit A first input / output port provided between the positive electrode bus and the negative electrode bus; a second input / output port provided between the negative electrode bus of the primary side full bridge circuit and the center tap of the primary coil of the transformer; The secondary side conversion circuit includes a secondary coil configured by magnetically coupling a secondary coil of a center tap transformer and two reactors connected to both ends of the secondary coil of the transformer. Side magnetic coupling reactor and A secondary full bridge circuit including a bridge portion, a third input / output port provided between a positive bus and a negative bus of the secondary full bridge circuit, a negative bus and a transformer of the secondary full bridge circuit A secondary input / output port provided between the center tap of the secondary coil of the container and the primary secondary battery is connected to the second input / output port, and the secondary secondary battery is The external AC power supply connected to the third input / output port is preferably connected to the fourth input / output port via a diode bridge circuit.

  In the power conversion circuit system according to the present invention, the fourth input / output port may include a switching unit that switches the connection destination to either one of a capacitor and an external AC power source via a diode bridge circuit. preferable.

  According to the structure of the said invention, it can control to charge the electric power input from the external alternating current power supply to at least any one of a primary side secondary battery and a secondary side secondary battery. Thereby, the secondary battery connected to each of a primary side conversion circuit and a secondary side conversion circuit can be suitably charged using an external AC power supply.

In embodiment which concerns on this invention, it is a figure which shows a power converter circuit system provided with a power converter circuit. In embodiment which concerns on this invention, it is a figure which shows the timing chart regarding the supply voltage given to a power converter circuit by control of a control circuit. In embodiment which concerns on this invention, it is a figure which shows a power converter circuit system. In an embodiment concerning the present invention, it is a figure showing a secondary side conversion circuit. In embodiment which concerns on this invention, it is a figure which shows the internal equivalent circuit of a secondary battery. In embodiment which concerns on this invention, it is a figure which shows the current waveform which flows into a secondary side conversion circuit and a secondary battery. In embodiment concerning this invention, it is a flowchart which shows the procedure which charges each secondary battery using an external alternating current power supply.

  Embodiments according to the present invention will be described below in detail with reference to the accompanying drawings. In the following description, the same elements are denoted by the same reference symbols in all the drawings, and redundant description is omitted.

  FIG. 1 is a diagram illustrating a power conversion circuit system 100 including a power conversion circuit 10. The power conversion circuit system 100 includes a power conversion circuit 10 and a control circuit 50. The power conversion circuit 10 has a function of selecting any two input / output ports from the four input / output ports and performing power conversion between the two input / output ports. The power conversion circuit 10 includes a primary side conversion circuit 20 and a secondary side conversion circuit 30. The primary side conversion circuit 20 and the secondary side conversion circuit 30 are magnetically coupled by a transformer 400 (center tap transformer).

  The primary side conversion circuit 20 includes a primary side full bridge circuit 200, a first input / output port 280, and a second input / output port 290. The primary side full bridge circuit 200 includes a primary side coil 202 of the transformer 400, a primary side magnetic coupling reactor 204, a primary side upper left arm 206, a primary side lower left arm 208, and a primary side upper right arm. 210 and a primary lower right arm 212. Here, the primary side upper left arm 206, the primary side lower left arm 208, the primary side upper right arm 210, and the primary side lower right arm 212 are respectively connected in parallel to the MOS transistor. It consists of a diode.

  A primary left arm circuit 207 in which a primary upper left arm 206 and a primary lower left arm 208 are connected in series is attached between the primary positive bus 298 and the primary negative bus 299. . Further, between the primary positive electrode bus 298 and the primary negative electrode bus 299, there is a primary right arm circuit 211 in which a primary upper right arm 210 and a primary lower right arm 212 are connected in series. The secondary left arm circuit 207 is attached in parallel.

  A primary side coil 202 and a primary side magnetic coupling reactor 204 are provided at a bridge portion connecting the midpoint 207 m of the primary left arm circuit 207 and the midpoint 211 m of the primary side right arm circuit 211. . The connection relationship in the bridge portion will be described in more detail. One end of the primary side magnetic coupling reactor 204a is connected to the midpoint 207m of the primary side left arm circuit 207. One end of the primary coil 202 is connected to the other end of the primary side magnetic coupling reactor 204a. Further, one end of the primary side magnetic coupling reactor 204 b is connected to the other end of the primary side coil 202. Then, the other end of the primary side magnetic coupling reactor 204 b is connected to the midpoint 211 m of the primary side right arm circuit 211. The primary side magnetic coupling reactor 204 includes a primary side magnetic coupling reactor 204a and a primary side magnetic coupling reactor 204b magnetically coupled to the primary side magnetic coupling reactor 204a.

  The first input / output port 280 is a port provided between the primary positive electrode bus 298 and the primary negative electrode bus 299. The first input / output port 280 includes a terminal 602 and a terminal 604. The second input / output port 290 is a port provided between the primary negative electrode bus 299 and the center tap 202 m of the primary coil 202. The second input / output port 290 includes a terminal 604 and a terminal 606.

  The secondary side conversion circuit 30 includes a secondary side full bridge circuit 300, a third input / output port 380, and a fourth input / output port 390. The secondary full bridge circuit 300 includes a secondary coil 302 of the transformer 400, a secondary magnetic coupling reactor 304, a secondary upper left arm 306, a secondary lower left arm 308, and a secondary upper right arm. 310 and a secondary side lower right arm 312. Here, the secondary upper left arm 306, the secondary lower left arm 308, the secondary upper right arm 310, and the secondary lower right arm 312 are respectively connected in parallel to the bipolar transistor and the bipolar transistor. It consists of a diode.

  A secondary left arm circuit 307 in which a secondary upper left arm 306 and a secondary lower left arm 308 are connected in series is attached between the secondary positive bus 398 and the secondary negative bus 399. . Further, between the secondary positive electrode bus 398 and the secondary negative electrode bus 399, there are two secondary right arm circuits 311 in which a secondary upper right arm 310 and a secondary right lower arm 312 are connected in series. The secondary left arm circuit 307 is attached in parallel.

  A secondary coil 302 and a secondary magnetic coupling reactor 304 are provided at a bridge portion connecting the midpoint 307m of the secondary left arm circuit 307 and the midpoint 311m of the secondary right arm circuit 311. . The connection relationship will be described in more detail with respect to the bridge portion. One end of the secondary side magnetic coupling reactor 304a is connected to the midpoint 311m of the secondary side right arm circuit 311. One end of the secondary coil 302 is connected to the other end of the secondary magnetic coupling reactor 304a. Further, one end of the secondary side magnetic coupling reactor 304 b is connected to the other end of the secondary side coil 302. Then, the other end of the secondary side magnetic coupling reactor 304 b is connected to the midpoint 307 m of the secondary left arm circuit 307. The secondary side magnetic coupling reactor 304 includes a secondary side magnetic coupling reactor 304a and a primary side magnetic coupling reactor 304b magnetically coupled to the secondary side magnetic coupling reactor 304a.

  The third input / output port 380 is a port provided between the secondary positive electrode bus 398 and the secondary negative electrode bus 399. The third input / output port 380 includes a terminal 608 and a terminal 610. The fourth input / output port 390 is a port provided between the secondary negative electrode bus 399 and the center tap 302 m of the secondary coil 302. The fourth input / output port 390 includes a terminal 610 and a terminal 612.

  The control circuit 50 has a function of performing switching control of switching elements (MOS transistors or bipolar transistors) of the primary side conversion circuit 20 and the secondary side conversion circuit 30. The control circuit 50 includes a power conversion mode determination processing unit 502, a phase difference φ determination processing unit 504, an on-time δ determination processing unit 506, a primary side switching processing unit 508, and a secondary side switching processing unit 510. Consists of including.

  The power conversion mode determination processing unit 502 is based on an external signal (not shown) or a signal from an external charging processing unit 514 (see FIG. 3) of the control circuit 50 to be described later. The operation mode is selected from L and determined. The power conversion mode is a mode A in which the power input from the first input / output port 280 is converted and output to the second input / output port 290, and the power input from the first input / output port 280 is converted to a third. There are a mode B for outputting to the input / output port 380 and a mode C for converting the power input from the first input / output port 280 and outputting it to the fourth input / output port 390.

  A mode D for converting the power input from the second input / output port 290 and outputting the converted power to the first input / output port 280, and a third input / output port for converting the power input from the second input / output port 290. There is a mode E for outputting to 380 and a mode F for converting the power input from the second input / output port 290 and outputting it to the fourth input / output port 390.

  Further, the mode G that converts the power input from the third input / output port 380 and outputs it to the first input / output port 280, and the second input / output port that converts the power input from the third input / output port 380. There are a mode H for outputting to 290 and a mode I for converting the power input from the third input / output port 380 and outputting it to the fourth input / output port 390.

  Then, the mode J for converting the power input from the fourth input / output port 390 and outputting it to the first input / output port 280, and the second input / output port for converting the power input from the fourth input / output port 390 There are a mode K for outputting to 290 and a mode L for converting the power input from the fourth input / output port 390 and outputting to the third input / output port 380.

  The phase difference φ determination processing unit 504 is configured to cause the power conversion circuit 10 to function as a DC-DC converter circuit, so that the phase difference between the switching periods of the switching elements between the primary side conversion circuit 20 and the secondary side conversion circuit 30 is determined. Has a function to set φ.

  The on-time δ determination processing unit 506 operates switching elements of the primary side conversion circuit 20 and the secondary side conversion circuit 30 in order to cause the primary side conversion circuit 20 and the secondary side conversion circuit 30 to function as step-up / down circuits, respectively. It has a function of setting the on time δ.

  The primary side switching processing unit 508 includes a primary side upper left arm 206 and a primary side lower left based on the outputs of the power conversion mode determination processing unit 502, the phase difference φ determination processing unit 504, and the on-time δ determination processing unit 506. Each of the switching elements (MOS transistors) of the arm 208, the primary upper right arm 210, and the primary lower right arm 212 has a function of switching control.

  The secondary-side switching processing unit 510 includes a secondary-side upper left arm 306 and a secondary-side lower left based on the outputs of the power conversion mode determination processing unit 502, the phase difference φ determination processing unit 504, and the on-time δ determination processing unit 506. The switching function of each switching element (bipolar transistor) of the arm 308, the secondary upper right arm 310, and the secondary lower right arm 312 is controlled.

  The operation of the power conversion circuit system 100 will be described with reference to FIG. When an external signal requesting to operate the power conversion mode of the power conversion circuit 10 as mode F is input, the power conversion mode determination processing unit 502 of the control circuit 50 performs the power conversion mode of the power conversion circuit 10. Is determined as mode F. At this time, the voltage input to the second input / output port 290 is boosted by the boosting function of the primary side conversion circuit 20, and the boosted voltage is increased by the function of the power conversion circuit 10 as a DC-DC converter circuit. The signal is transmitted to the input / output port side, further stepped down by the step-down function of the secondary side conversion circuit 30, and output from the fourth input / output port.

  Here, the step-up / step-down function of the primary side conversion circuit 20 will be described in detail. Paying attention to the second input / output port 290 and the first input / output port 280, the terminal 606 of the second input / output port 290 has a primary side magnetic coupling connected in series to the primary side coil 202a and the primary side coil 202a. The reactor 204a is connected to the midpoint 207m of the primary left arm circuit 207 via the reactor 204a. Since both ends of the primary left arm circuit 207 are connected to the first input / output port 280, a step-up / down circuit is provided between the terminal 606 of the second input / output port 290 and the first input / output port 280. Will be attached.

  Further, the terminal 606 of the second input / output port 290 is connected to the middle of the primary side right arm circuit 211 via the primary side coil 202b and the primary side magnetic coupling reactor 204b connected in series to the primary side coil 202b. Connected to point 211m. Since both ends of the primary side right arm circuit 211 are connected to the first input / output port 280, there is a step-up / down voltage between the terminal 606 of the second input / output port 290 and the first input / output port 280. The circuit is attached in parallel. Since the secondary side conversion circuit 30 is a circuit having substantially the same configuration as the primary side conversion circuit 20, between the terminal 612 of the fourth input / output port 390 and the third input / output port 380, Two step-up / step-down circuits are connected in parallel. Therefore, the secondary side conversion circuit 30 has a step-up / step-down function like the primary side conversion circuit 20.

  Next, the function of the power conversion circuit 10 as a DC-DC converter circuit will be described in detail. Focusing on the first input / output port 280 and the third input / output port 380, the primary input / output port 280 is connected to the primary side full bridge circuit 200, and the third input / output port 380 is connected to the secondary side full bridge. A circuit 300 is connected. Then, the primary side coil 202 provided in the bridge portion of the primary side full bridge circuit 200 and the secondary side coil 302 provided in the bridge portion of the secondary side full bridge circuit 300 are magnetically coupled, so that the transformer It functions as 400 (center tap type transformer having a winding number of 1: N). Therefore, by adjusting the phase difference between the switching periods of the switching elements of the primary side full bridge circuit 200 and the secondary side full bridge circuit 300, the power input to the first input / output port 280 is converted to the third input. The power can be transmitted to the output port 380, or the power input to the third input / output port 380 can be converted and transmitted to the first input / output port 280.

FIG. 2 is a diagram illustrating a timing chart relating to a supply voltage supplied to the power conversion circuit 10 under the control of the control circuit 50. Here, V _u1 is the potential of the middle point 207m of the primary left arm circuit 207, V _v1 is the potential of the middle point 211m of the primary side right arm circuit 211, and V _u2 is the secondary side. the potential of the midpoint 307m of the left arm circuit 307, V _v2 is the potential of the midpoint 311m of the secondary right arm circuit 311.

Here, the step-up / step-down ratio of the primary side conversion circuit 20 and the secondary side conversion circuit 30 can be changed by changing the ON times δ of V _u1 , V _v1 , V _u2, and V _v2 . The phase difference between V _u1 and V _v1 is operated at 180 degrees (π), and the phase difference between V _u2 and V _v2 is also operated at 180 degrees (π). Furthermore, by changing the phase difference φ between V _u1 and V _u2, the amount of power transmitted between the primary side conversion circuit 20 and the secondary side conversion circuit 30 can be adjusted, so that the phase difference φ> 0. For example, the signal can be transmitted from the primary side conversion circuit 20 to the secondary side conversion circuit 30, and can be transmitted from the secondary side conversion circuit 30 to the primary side conversion circuit 20 if the phase difference φ <0.

  Therefore, when an external signal requesting to operate the power conversion mode of the power conversion circuit 10 as mode F is input, the power conversion mode determination processing unit 502 determines to select the mode F. The on-time δ determination processing unit 506 boosts when the primary side conversion circuit 20 functions as a booster circuit that boosts the voltage input to the second input / output port 290 and outputs the boosted voltage to the first input / output port 280. An on-time δ that defines the ratio is set. In the secondary side conversion circuit 30, the voltage input to the third input / output port 380 is stepped down by the step-down ratio defined by the on-time δ set by the on-time δ determination processing unit 506. It functions as a step-down circuit that outputs to the port 390. Furthermore, the phase difference φ determination processing unit 504 sets the phase difference φ for transmitting the power input to the first input / output port 280 to the third input / output port 290 with a desired power transmission amount.

  The primary-side switching processing unit 508 includes a primary-side upper left arm 206 so that the primary-side conversion circuit 20 functions as a booster circuit and the primary-side conversion circuit 20 functions as a part of the DC-DC converter circuit. Switching control is performed on each switching element of the primary left lower arm 208, the primary right upper arm 210, and the primary right lower arm 212.

  The secondary side switching processing unit 510 includes a secondary side upper left arm 306 so that the secondary side conversion circuit 30 functions as a step-down circuit and the secondary side conversion circuit 30 functions as a part of the DC-DC converter circuit. Switching control is performed on the switching elements of the secondary left lower arm 308, the secondary right upper arm 310, and the secondary right lower arm 312.

  As described above, the primary side conversion circuit 20 and the secondary side conversion circuit 30 can function as a step-up circuit or a step-down circuit, and the power conversion circuit 10 can also function as a bidirectional DC-DC converter circuit. Can do. Therefore, power conversion can be performed in all the power conversion modes A to F, in other words, power conversion can be performed between two input / output ports selected from among the four input / output ports. .

  Next, the power conversion circuit system 101 in which a secondary battery or the like is connected to each port of the power conversion circuit 10 will be described. FIG. 3 is a diagram illustrating the power conversion circuit system 101. The power conversion circuit system 101 includes a power conversion circuit 10, a control circuit 50a, a capacitor 51 connected to the first input / output port 280, a secondary battery 55 connected to the second input / output port 290, a third The battery includes a secondary battery 60 connected to the input / output port 380, a current sensor 71 connected to the fourth input / output port, a switching circuit 72, a capacitor 74, a diode bridge 76, and an external AC power supply 78. The difference between the power conversion circuit system 101 and the power conversion circuit system 100 is that the capacitor 51, secondary battery 55, secondary battery 60, current sensor 71, switching circuit 72, capacitor 74, diode bridge 76, external AC power supply 78, load 65, load 66, load 67 and the functions of the SOC reading processing unit 512, the external charging processing unit 514, the temperature increase processing unit 516, and the relay switching processing unit 518 of the control circuit 50a. Explained.

  The load 65 is a load device for driving the vehicle, and is configured using, for example, a motor generator capable of power running regeneration. The secondary battery 60 is a vehicle drive battery that supplies power to the required power of the load 65, and is configured using, for example, a lithium ion secondary battery that outputs a voltage of 200v to 300v.

  The load 66 is a load device that operates at a voltage of about 42 v to 46 v, and is configured using, for example, an electric power steering. The load 67 is a load device for the control system. The capacitor 51 is a capacitive element that accumulates the voltage boosted by the primary side conversion circuit 20. The secondary battery 55 is a control system battery that supplies electric power with respect to the required power of the load 66 and the load 67, and is configured using, for example, a lead storage battery that outputs a voltage of 12v. Then, the 12v voltage output from the secondary battery 55 is supplied to the load 67, boosted by the primary side conversion circuit 20 (4 times the boost ratio), and supplied to the load 66 through the capacitor 51.

  The current sensor 71 is an ammeter provided between the terminal 612 of the fourth input / output port 390 and the first terminal 721 of the switching circuit 72.

  The capacitor 74 is a capacitive element having one terminal connected to the terminal 610 of the fourth input / output port 390 and the other terminal connected to the second terminal 722 of the switching circuit 72.

  The diode bridge 76 is a bridge-type full-wave rectifier circuit including diodes 762, 764, 766, and 768, one side terminal is connected to the terminal 610 of the fourth input / output port, and the other side terminal is a switching circuit. 72 is connected to the third terminal 723.

  The external AC power supply 78 has one terminal connected to a connection point between the diode 762 and the diode 764 of the diode bridge 76, and the other terminal connected to a connection point between the diode 766 and the diode 768 of the diode bridge 76. As the external AC power supply 78, a commercial power supply supplied from system power of an electric power company or the like can be used. For example, a 100 V AC power supply is used.

  The switching circuit 72 is subjected to switching control by the control circuit 50a. When the first terminal 721 is connected to the second terminal 722, the capacitor 74 is connected to the fourth input / output port 390, and the first terminal 721 is connected. Is connected to the third terminal 723, the external AC power supply 78 is connected to the fourth input / output port 390 via the diode bridge 76.

The SOC reading processing unit 512 stores SOC (State Of Charge) of each secondary battery (where the SOC of the secondary battery 55 is SOC (S) and the SOC of the secondary battery 60 is SOC (V)). ). In addition, the SOC reading processing unit 512 has a function of determining whether or not the SOC (S) of the secondary battery 55 is larger than a predetermined lower limit charged amount (SOC _min (S)). Further, it has a function of determining whether or not the SOC (V) of the secondary battery 60 is larger than a predetermined lower limit charged amount (SOC _min (V)). Then, having the function of SOC of the secondary battery 60 (V) it is determined whether or not smaller than a predetermined upper limit accumulation amount (SOC _max (V)).

  The external charging processing unit 514 calculates a command value related to charging power to be charged to the secondary battery 60 by the power from the external AC power supply 78, and determines the power conversion mode so that the power conversion circuit 10 operates as mode L. It has a function of giving a command to the processing unit 502. The external charging processing unit 514 calculates a command value related to the charging power to be charged even when the secondary battery 55 is charged with the power from the external AC power supply 78 via the secondary battery 60, and the power conversion circuit 10 has a function of giving a command to the power conversion mode determination processing unit 502 so that 10 operates as mode H. Further, the external charging processing unit 514 appropriately controls the current value I measured by the current sensor 71 in accordance with the phase change of the external AC power supply 78, thereby performing secondary side conversion while performing power factor improvement control (PFC control). The circuit 30 has a function of operating as a booster circuit. In addition, the external charging processing unit 514 sets which charging mode is selected from the charging modes 1 and 2 which are two modes for charging the secondary battery 60 and the secondary battery 55 using the external AC power supply 78. And after setting, it has the function to determine which charging mode is set.

  The temperature increase processing unit 516 has a function of performing temperature increase control on the secondary side conversion circuit 30 and increasing the temperature of the secondary battery 60 using heat generated by the secondary battery 60 itself. Here, before the temperature increase control is performed by the temperature increase processing unit 516, the connection destination of the first terminal 721 of the switching circuit 72 is switched to the second terminal 722 by the relay switching processing unit 518. A capacitor 74 is connected to the input / output port 390. And the figure which cut out the secondary side conversion circuit 30 at this time is described as FIG. An internal equivalent circuit of the secondary battery 60 is shown in FIG. The temperature increase processing unit 516 has a function of determining whether or not the battery temperature TB of the secondary battery 60 is higher than a predetermined threshold temperature Tx.

  As shown in FIG. 5, the internal impedance of the secondary battery 60 includes resistance components 606 and 610, a reactor component 608, and a capacitor component 604, and the internal impedance of the secondary battery 60 changes as each changes. . Therefore, by operating the secondary side conversion circuit 30 at a frequency at which the internal impedance of the secondary battery 60 is minimized, the peak value of the current flowing through the secondary battery 60 is also increased. The amount of heat generated from is increased.

Thus, the on-time is set so that the on-time δ is set such that the internal impedance is the smallest and the duty ratio of the secondary left arm circuit 307 and the secondary right arm circuit 311 is 50%. A command is given to the time δ determination processing unit 506, and the phase difference φ determination processing unit 504 so that the phase difference φ between V _u1 and V _u2 and the phase difference φ between V _v1 and V _v2 are also operated at 180 degrees (π). Is given a directive. As a result, currents 307i and 311i shown in FIG. 6 flow through the secondary left arm circuit 307 and the secondary right arm circuit 311 via the capacitor 74, respectively, and the secondary battery 60 shows the current shown in FIG. Thus, since the sawtooth current flows as in 60i, the temperature rise control of the secondary battery 60 can be performed.

  At this time, by designing the frequency as the frequency at which the internal impedance is the smallest to be lower than the operating frequency that is driven by the motor generator of the load 65, the transformer 400 is saturated and invalidated to become an air-core reactor. Power is not exchanged between the primary side conversion circuit 20 and the secondary side conversion circuit 30. Thereby, the control which considers the voltage of the secondary battery 55 of the primary side conversion circuit 20, and the electrical storage amount is unnecessary.

  The relay switching processing unit 518 has a function of switching the connection destination of the first terminal 721 of the switching circuit 72 to the second terminal 722 or the third terminal 723. When the connection destination of the first terminal 721 of the switching circuit 72 is switched to the second terminal 722, the capacitor 74 is connected to the fourth input / output port 390, and the first terminal 721 of the switching circuit 72 is connected. Is switched to the third terminal 723, the external input / output power supply 78 is connected to the fourth input / output port 390 via the diode bridge 76.

  By the way, if the electric power accumulated in the secondary battery 55 and the secondary battery 60 is supplied to each load, the amount of charge SOC of the secondary battery 55 and the secondary battery 60 decreases, but the power conversion According to the circuit system 101, the secondary batteries 55 and 60 can be suitably charged using the power of the external AC power supply 78. Hereinafter, the operation of the power conversion circuit system 101 will be described. FIG. 7 is a flowchart showing a procedure for charging both the secondary battery 55 and the secondary battery 60 using the external AC power supply 78.

  First, the control circuit 50a reads the storage amounts SOC (S) and SOC (V) of the secondary batteries 55 and 60 (S10). This step is executed by the function of the SOC reading processing unit 512 of the control circuit 50a.

Next, it is determined whether or not the SOC (S) of the secondary battery 55 is larger than a predetermined lower limit storage amount (SOC _min (S)) (S12). This step is executed by the function of the SOC reading processing unit 512 of the control circuit 50a. If it is determined that the SOC (S) of the secondary battery 55 is larger than the predetermined lower limit storage amount (SOC _min (S)), the process proceeds to step S22.

If it is determined that the SOC (S) of the secondary battery 55 is smaller than the predetermined lower limit storage amount (SOC _min (S)), the SOC (V) of the secondary battery 60 is set to the predetermined lower limit storage amount (SOC _min (SOC _min (S V)) is determined (S14). This step is executed by the function of the SOC reading processing unit 512 of the control circuit 50a.

In step S14, when it is determined that the SOC (V) of the secondary battery 60 is larger than the predetermined lower limit storage amount (SOC _min (V)), power is transmitted from the secondary battery 60 to the secondary battery 55. Thus, the power conversion circuit 10 is operated in the mode H (S16). This process is executed by the functions of the external charging processing unit 514 and the power conversion mode determination processing unit 502 of the control circuit 50a. After step S16, the process proceeds to step S12.

If it is determined in step S14 that the SOC (V) of the secondary battery 60 is smaller than the predetermined lower limit storage amount (SOC _min (V)), the charging mode is set to 1 (S18). This step is executed by the function of the external charging processing unit 514 of the control circuit 50a.

  After the process of S18, the maximum command value of the charging power necessary for the secondary battery 60 is calculated (S28). This step is executed by the function of the external charging processing unit 514 of the control circuit 50a. Then, the connection destination of the first terminal 721 of the switching circuit 72 is switched to the third terminal 723 (S30). This step is executed by the function of the relay switching processing unit 518.

  After the step S30, the AC power of the external AC power supply 78 is full-wave rectified by the diode bridge 76, and the power is boosted by the secondary conversion circuit 30 and charged to the secondary battery 60. Here, since the power conversion circuit 10 operates in the mode L, the secondary conversion circuit 30 functions as a booster circuit. At this time, the power factor correction control (PFC control) is performed. This process is executed by the functions of the external charging processing unit 514 and the power conversion mode determination processing unit 502 of the control circuit 50a.

  After the step S32, the connection destination of the first terminal 721 of the switching circuit 72 is switched to the second terminal 722 (S33). This step is executed by the function of the relay switching processing unit 518. Then, it is determined whether the charging mode is 1 or 2 (the case where the charging mode is 2 will be described in step S26) (S20). This step is executed by the function of the external charging processing unit 514 of the control circuit 50a. When it is determined in step S20 that the charging mode is 1, the process proceeds to step S12. If it is determined in step S20 that the charging mode is 2, the process proceeds to step S22.

In the step S22, it is determined whether or not the SOC (V) of the secondary battery 60 is smaller than a predetermined upper limit charged amount (SOC _max (V)) (S22). This step is executed by the function of the SOC reading processing unit 512 of the control circuit 50a. In step S22, when it is determined that the SOC (V) of the secondary battery 60 is smaller than the predetermined upper limit storage amount (SOC _max (V)), the battery temperature TB of the secondary battery 60 is a predetermined threshold temperature. It is determined whether or not it is larger than Tx (S24). This step is executed by the function of the temperature increase processing unit 516 of the control circuit 50a. If it is determined in step S24 that the battery temperature TB of the secondary battery 60 is higher than the predetermined threshold temperature Tx, the charging mode is set to 2 (S26), and the process proceeds to step S28. This step is executed by the function of the external charging processing unit 514 of the control circuit 50a.

In step S24, when it is determined that the battery temperature TB of the secondary battery 60 is lower than the predetermined threshold temperature Tx, the SOC (V) of the secondary battery 60 is a predetermined lower limit storage amount (SOC _min (V)). It is determined whether it is smaller than () (S40). This step is executed by the function of the SOC reading processing unit 512 of the control circuit 50a. If it is determined in step S40 that the SOC (V) of the secondary battery 60 is larger than the predetermined lower limit storage amount (SOC _min (V)), the process proceeds to step S26.

In step S40, when it is determined that the SOC (V) of the secondary battery 60 is smaller than the predetermined lower limit storage amount (SOC _min (V)), the connection destination of the first terminal 721 of the switching circuit 72 is changed to the first destination. Switching to the two terminal 722 (S38). This step is executed by the function of the relay switching processing unit 518.

  After the process of S38, temperature increase control is performed on the secondary side conversion circuit 30, and the temperature of the secondary battery 60 is raised using the heat generated by the secondary battery 60 itself (S34). This step is executed by the function of the temperature increase processing unit 516. After step S34, the process proceeds to step S24.

In step S22, when it is determined that the SOC (V) of the secondary battery 60 is larger than the predetermined upper limit charged amount (SOC _max (V)), the connection destination of the first terminal 721 of the switching circuit 72 is changed to the first destination. Switching to the two-terminal 722 (S36). This step is executed by the function of the relay switching processing unit 518. After step S36, the process proceeds to END processing.

  As described above, according to the power conversion circuit system 101, when the storage amount SOC (S) of the secondary battery 55 that is a control system battery is insufficient, the secondary battery 60 that is a vehicle drive battery If the storage amount SOC (V) is sufficient, the storage amount SOC (S) of the secondary battery 55 can be supplemented by controlling so that power is transmitted from the secondary battery 60 to the secondary battery 55. .

  If the storage amount SOC (S) of the secondary battery 55 is insufficient and the storage amount SOC (V) of the secondary battery 60 is also insufficient, the secondary battery is temporarily used by using the external AC power supply 78. 60 to charge the secondary battery 60 so that the stored amount SOC (V) of the secondary battery 60 is sufficient, and then control the power to be transmitted from the secondary battery 60 to the secondary battery 55. SOC (S) can be replenished.

Further, according to the power conversion circuit system 101, the secondary battery 55 is preferentially charged out of the secondary battery 55 and the secondary battery 60, and the storage amount SOC (S) of the secondary battery 55 is sufficient. From this, it is determined whether or not the secondary battery 60 needs to be charged. At this time, it is determined that the storage amount SOC (V) of the secondary battery 60 is insufficient, the temperature TB of the secondary battery 60 is low, and the storage amount SOC (V) is a predetermined lower limit storage amount ( If it is lower than SOC _min (V)), charging using the external AC power supply 78 is suitably performed by increasing the temperature of the secondary battery 60 by controlling the temperature increase of the secondary conversion circuit 30. Can be made.

DESCRIPTION OF SYMBOLS 10 Power conversion circuit, 20 Primary side conversion circuit, 30 Secondary side conversion circuit, 50, 50a Control circuit, 51 Capacitor, 55, 60 Secondary battery, 65, 66, 67 Load, 71 Current sensor, 72 Switching circuit, 74 capacitor, 76 diode bridge, 78 external AC power supply, 100, 101 power conversion circuit system, 200 primary side full bridge circuit 202, 202a, 202b primary side coil, 202m center tap, 204, 204a, 204b primary side magnetism Coupling reactor, 206 primary left upper arm, 207 primary left arm circuit, 207m midpoint, 208 primary left bottom arm, 210 primary right arm, 211 primary right arm circuit, 211m midpoint, 212 1 Secondary lower right arm, 280, 290 I / O port, 298 Primary positive bus, 299 Primary side Negative bus, 300 Secondary full bridge circuit, 302 Secondary coil, 302 m Center tap, 304, 304a, 304b Secondary magnetic coupling reactor, 306 Secondary left upper arm, 307 Secondary left arm circuit, 307i Current 307m Middle point, 308 Secondary lower left arm, 310 Secondary upper right arm, 311 Secondary right arm circuit, 311m Middle point, 312 Secondary lower right arm, 380 Third input / output port, 390 Fourth input Output port, 398 secondary positive bus, 399 secondary negative bus, 400 transformer, 502 power conversion mode determination processing unit, 504 phase difference φ determination processing unit, 506 on-time δ determination processing unit, 508 primary side switching Processing unit, 510 secondary side switching processing unit, 512 SOC reading processing unit, 514 external charging processing unit, 516 temperature rising processing unit, 18 relay switching unit, 602,604,606,608,610,612 terminal, 721 a first terminal, 722 a second terminal, 723 a third terminal, 762,764,766,768 diode.

Claims (5)

Two input / output ports of the primary side conversion circuit;
A power conversion circuit system that includes a total of four input / output ports including two input / output ports of a secondary side conversion circuit that is magnetically coupled to the primary side conversion circuit, and performs power conversion between any two input / output ports. There,
A primary side secondary battery connected to any one of the input / output ports of the primary side conversion circuit;
A secondary side secondary battery connected to any one of the input / output ports of the secondary side conversion circuit;
An external AC power source connected to any one of the remaining input / output ports;
A control unit that performs control to charge at least one of the primary side secondary battery and the secondary side secondary battery with the electric power input from the external AC power source;
A power conversion circuit system comprising: The power conversion circuit system according to claim 1,
The control unit
The electric power input from the external AC power source is connected to the other secondary battery via one secondary battery connected to the conversion circuit to which the external AC power source is connected among the primary side secondary battery and the secondary side secondary battery. A power conversion circuit system, characterized in that control is performed so as to charge a secondary battery. In the power converter circuit system according to claim 1 or 2,
When charging the secondary battery connected to the conversion circuit to which the external AC power source is connected among the primary side secondary battery and the secondary side secondary battery with the power input from the external AC power source, A power conversion circuit system comprising temperature raising means for raising the temperature of one of the secondary batteries. The power conversion circuit system according to claim 1,
The primary side conversion circuit
The primary side coil of the center tap type transformer that magnetically couples the primary side conversion circuit and the secondary side conversion circuit, and two reactors connected to both ends of the primary side coil of the transformer are magnetically coupled. A primary-side full-bridge circuit including a bridge portion having a primary-side magnetically coupled reactor,
A first input / output port provided between the positive and negative buses of the primary full bridge circuit;
A second input / output port provided between the negative bus of the primary full bridge circuit and the center tap of the primary coil of the transformer;
The secondary conversion circuit
A bridge portion having a secondary side coil of a center tap type transformer and a secondary side magnetic coupling reactor configured by magnetically coupling two reactors connected to both ends of the secondary side coil of the transformer; Including a secondary full bridge circuit including:
A third input / output port provided between the positive and negative buses of the secondary full bridge circuit;
A fourth input / output port provided between the negative bus of the secondary full bridge circuit and the center tap of the secondary coil of the transformer;
The primary side secondary battery is connected to the second input / output port,
The secondary secondary battery is connected to the third input / output port,
External AC power supply
A power conversion circuit system, wherein the power conversion circuit system is connected to a fourth input / output port via a diode bridge circuit. The power conversion circuit system according to claim 4,
The fourth input / output port is
A power conversion circuit system comprising switching means for switching the connection destination to one of a capacitor and an external AC power source via a diode bridge circuit.

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