WO2022137533A1

WO2022137533A1 - Power supply circuit

Info

Publication number: WO2022137533A1
Application number: PCT/JP2020/048823
Authority: WO
Inventors: 和征榊原
Original assignee: 株式会社EViP
Priority date: 2020-12-25
Filing date: 2020-12-25
Publication date: 2022-06-30

Abstract

[Problem] To make it possible to suppress discharge current from a battery power supply. [Solution] This power supply circuit comprises: a plurality of closed circuits which supply AC power from a battery power supply having a plurality of battery modules to a plurality of coils for driving a motor and are independent for the respective coils; switches for connecting between the closed circuits; and a controller which, when detecting a state in which power feeding from the battery module to the coils becomes impossible in a first closed circuit that is one of the plurality of closed circuits, turns on/off the switches so as to supply power from the battery module belonging to a second closed circuit other than the first closed circuit to the coil to which the power feeding has become impossible.

Description

Power circuit

The present invention relates to a power supply circuit.

In recent years, due to consideration for the global environment, internal combustion engines, that is, automobiles driven by engines are being replaced by electric vehicles driven by motors or hybrid vehicles driven by engines and motors. A three-phase motor is used in an electric vehicle or a hybrid vehicle, and Patent Document 1 discloses a technique for suppressing voltage fluctuations in a power line to a three-phase motor.

Japanese Unexamined Patent Publication No. 2019-140824

In the conventional motor system, the discharge current input from the battery power supply to the boost converter tends to be very large.

An object of the present invention is to provide a technique capable of suppressing a discharge current from a battery power source.

The main invention of the present invention for solving the above problems is a power supply circuit, in which AC power is applied to a plurality of coils for driving a motor from a battery power source having a plurality of battery modules, and each of the coils is independent. A state in which power cannot be supplied from the battery module to the coil in a plurality of closed circuits, a switch connecting the closed circuits, and a first closed circuit which is one of the plurality of closed circuits. When detected, a controller that turns the switch on and off so as to supply power from the battery module belonging to the first closed circuit and another second closed circuit to the coil that cannot supply power. It is characterized by being prepared.

According to the present invention, the discharge current from the battery power source can be suppressed.

It is a circuit block diagram which shows the outline of the structure of the battery module 2 which concerns on this embodiment. It is a circuit block diagram which shows the outline of the structure of the motor system 103 which concerns on this embodiment. It is a circuit block diagram which shows the outline of the structure and state of the motor system 104 (a) as the 1st state which concerns on this embodiment. It is a circuit block diagram which shows the outline of the structure and state of the motor system 104 (b) as the 2nd state which concerns on this embodiment. It is a circuit block diagram which shows the outline of the structure and state of the motor system 104 (c) as the 3rd state which concerns on this embodiment. It is a flowchart which shows the outline of the control of the main controller 9 of the motor system 104 which concerns on this embodiment. It is a circuit block diagram for phase synchronization in embodiment of this invention.

As shown in FIG. 1, the battery module 2 according to the present embodiment is an energization cutoff element for energizing or stopping the discharge current of a high voltage rated battery cell group 1H composed of a plurality of lithium ion secondary battery cells. It is connected to the terminal 5 via the FET 4. The module controller 3 detects the voltage of the battery cell group 1H or the current of the battery cell group 1H, that is, the voltage appearing across the shunt resistance 6, and turns the FET 4 on or off according to the voltage or the current. Operate to control the output or stop of the discharge from the terminal 5. The module controller 3 may detect the temperature of the battery cell group 1H by using a temperature sensor (not shown) arranged in the vicinity of the battery cell group 1H.

As shown in FIG. 2, the motor system 103 according to the prior art according to the present embodiment has a high voltage power line that outputs a DC voltage output by the

battery modules

2U, 2V, and 2W having the same configuration as the battery module 2 shown in FIG. It is applied to the inverters 6U, 6V, and 6W via 5U, 5V, and 5W, respectively. The inverters 6U, 6V, and 6W input high DC voltages from the

battery modules

2U, 2V, and 2W, respectively, convert them into AC voltage, and convert the single-phase AC voltage into three phases in the motor. , 7V, and 7W, respectively, to generate a rotating magnetic field between the magnetic pole coils to control the rotation of the rotor. Insulating communication lines 8a, 8b and 8g are arranged between the inverters 6U and 6V and between the inverters 6V and 6W, respectively. The insulating communication line 8g can be a ground line. The insulating signal 8 shifts the phase of the three single-phase AC voltages output from the three inverters to a desired electric angle to generate a rotating magnetic field between the three-phase magnetic pole coils in the motor to rotate the rotor. Used to control. As shown in FIG. 7, one of the inverters 6U and 6V (host side) applies a voltage to the light emitting portion of the photocoupler 8H, and the other (slave side) detects the voltage of the light receiving portion of the photocoupler 8S for insulation. Digital communication is established. In the photocoupler 8, the light receiving unit outputs or stops the voltage according to the light emission or stop of the light emitting unit inside the photocoupler 8, and transmits the high and low waveforms of the voltage to the slave side as a predetermined insulating communication signal. On the slave side, for example, an AC voltage can be output and the AC voltage can be applied to the magnetic pole coil 7 by PWM switching control or the like according to an instruction of an insulating communication signal received from the host side via the photocoupler 8. That is, the host side can collectively control the AC voltage outputs of the two phases so as to shift the phases of the AC voltage applied to the magnetic pole coil 7U and the magnetic pole coil 7V to a desired electrical accuracy. At this time, the switching frequency of the insulating communication signal from the host side to the slave side can be made higher than the switching frequency of the PWM control.

In the motor system 103, it is determined that the module controller 3 of at least one battery module in the battery module belonging to the three-phase independent closed circuit needs to stop the discharge by detecting some abnormality or the like. When the FET 4 in the battery module is turned off to stop the discharge output, the main controller 9 detects the presence of the one battery module whose discharge output is stopped by using the insulating communication signal 10. Instructs all battery modules belonging to the phase closed circuit to stop the discharge output, and stops the discharge output of all battery modules including other battery modules that have not stopped discharging in conjunction with each other, resulting in an abnormal state of the battery module. Prevent expansion.

As shown in FIG. 3, the motor system 104 (a) as the first state according to the present embodiment uses three inverters belonging to three closed circuits and an insulating communication signal 13 in the motor system 103, respectively, as shown in FIG. It has a configuration in which a function for performing communication and a switch 12 for controlling energization or stoppage of energization between or within phases of different closed circuits are added. As shown in FIG. 3, the switch 12 is set on and off so that power is supplied independently from the

power supply modules

2U, 2V, and 2W to the inverters 6U, 6V, and 6W, respectively. The first state is the state of the motor system during normal operation.

The main controller 9 communicates with the inverters 6U, 6V, and 6W by an insulating communication signal 13 using, for example, a photocoupler, detects the control state of each inverter, and if necessary, the module controller in each battery module. Instruct 3 to output or stop the discharge from the terminal 5. Upon receiving the instruction, the module controller 3 operates the FET 4 in the battery module to be turned on or off to control the discharge voltage of the battery cell group 1H to be output or stopped from the terminal 5. Further, the main controller 9 can operate the opening / closing of the switch 12 by using the insulating control signal 11.

Next, the control of the main controller 9 of the motor system 104 will be described with reference to the flowchart of FIG.

The main controller 9 detects in

Steps

1 and 2 that power cannot be supplied from the U-phase battery module 2U of the three phases to the inverter 6U by using the insulating communication signal 10 and the insulating communication signal 13. When it is determined (Step1: YES, Step2: YES), it is detected in Step 3 whether or not the V phase electrically adjacent to the U phase can be fed. When it is determined that the V-phase power supply is possible (Step 3: YES), the process proceeds to Step 4 and the FET 4 in the battery module 2U is turned off by using the insulating communication signal 10 to the battery module 2U. Instructed to stop the discharge output from the terminal 5 of the battery module 2U, and in Step 4', operate the switch 12 using the insulating signal 11 to belong to the V phase and belong to the U phase. The circuit connection state between the V-phase and the U-phase shown in FIG. 4 for newly forming the power supply line to the inverter 6U and the magnetic pole coil 7U is established.

On the other hand, when it is determined that the V-phase power supply is not possible (Step3: NO), the process proceeds to Step5, and the U-phase and V-phase battery modules 2U and 2V are operated to turn off the FET4, respectively, to operate the battery module 2U. , Instructed to stop the output from the 2V terminal 5, and operated the opening and closing of the switch 12 using the insulating signal 11 from the battery module 2W belonging to the W phase to the inverter 6V and the magnetic pole coil 7V belonging to the V phase. In the circuit connection state shown in FIG. 5, a new power supply line is formed from the battery module 2V belonging to the V phase to the inverter 6U and the magnetic pole coil 7U belonging to the U phase. do.

By making a circuit connection between the phases in Step 4'or Step 5', the power supply to the U-phase inverter 6U and the magnetic pole coil 7U for which the power supply is disabled is maintained, and the three inverters control the three-phase motor. Can be continued. Further, in Step 7, the main controller 9 detects the control state of the three inverters using the insulating communication signal 13, and determines that the output of the three inverters is stopped, that is, the state in which the motor is stopped. Proceed to Step 8 and use the insulating communication signal 10 to turn off the FET 4 in each battery module to all the battery modules belonging to the three phases to instruct all the battery modules to stop the discharge output from the terminals 5. Stop the discharge output of the battery module. As a result, it is possible to reliably prevent the deterioration of reliability such as the expansion of the abnormal state due to the discharge of the battery power supply after the electric vehicle is self-propelled and evacuated to a safe place in an emergency by the operation of the driver.

Note that, in FIGS. 3 to 5, the switch 12 is schematically shown as a contact switch, but a semiconductor switch such as an FET may be used, for example.

In the above-mentioned Step 4'or Step 5', the battery module 2V or the battery module 2W supplies power to the inverter 6U and the magnetic pole coil 7U in place of the battery module 2U. At this time, the battery module 2V or the battery module 2W simultaneously bears the power supply for two phases including the inverter 6V and the magnetic pole coil 7V belonging to the same phase, or the inverter 6W and the magnetic pole coil 7W, so that the three-phase magnetic pole coil Even if the rotation torque of the rotor due to the magnetic pole coil 7V or the magnetic pole coil 7W tends to decrease slightly, if the power supply of the remaining other phases is normal, the motor control by all three phases, that is, It does not significantly affect the running performance of electric vehicles.

From the above, the electric vehicle equipped with the motor system 104 of the present invention can self-retract the electric vehicle to a safe place by the operation of the driver in an emergency, and can secure the reliability of the battery power supply. ..

The above-described embodiment is merely an example for facilitating the understanding of the present invention, and is not intended to limit the interpretation of the present invention. It goes without saying that the present invention can be modified and improved without departing from the spirit thereof, and the present invention includes its equivalents.

In addition, at least the following matters are disclosed in this specification.
[Item 1]
A plurality of independent closed circuits for each of the coils, which apply AC power to a plurality of coils for driving a motor from a battery power source having a plurality of battery modules.
A switch connecting the closed circuits and
When a state in which power cannot be supplied from the battery module to the coil is detected in the first closed circuit, which is one of the plurality of closed circuits, a second closed circuit different from the first closed circuit is detected. A controller that turns the switch on and off so as to supply power from the battery module belonging to the closed circuit of 2 to the coil that cannot supply power.
A power supply circuit characterized by being equipped with.
[Item 2]
The power supply circuit according to item 1.
The controller controls to stop the discharge output from all the battery modules when the drive stop of the motor is detected.
A power supply circuit featuring.

1

Battery cell group

2U, 2V, 2W Battery module 3U, 3V, 3W Low voltage power line 4U, 4V, 4W Boost converter 5U, 5V, 5W High voltage power line 6U, 6V, 6W Inverter 7U, 7V, 7W Magnetic pole coil 8a , 8b, 8g, Insulated Communication Line 103, 104 Motor System

Claims

A plurality of independent closed circuits for each of the coils, which apply AC power to a plurality of coils for driving a motor from a battery power source having a plurality of battery modules.
A switch connecting the closed circuits and
When a state in which power cannot be supplied from the battery module to the coil is detected in the first closed circuit, which is one of the plurality of closed circuits, a second closed circuit different from the first closed circuit is detected. A controller that turns the switch on and off so as to supply power from the battery module belonging to the closed circuit 2 to the coil that cannot supply power.
A power supply circuit characterized by being equipped with.
The power supply circuit according to claim 1.
The controller controls to stop the discharge output from all the battery modules when the drive stop of the motor is detected.
A power supply circuit featuring.