CN-122001270-A - Power supply system

Abstract

The present disclosure relates to power supply systems. The power supply system includes a first inverter connected to a first battery via a first positive line and a negative line, a second inverter connected to a second battery via a second positive line and the negative line, a first capacitor connected to the first positive line and the negative line, a second capacitor connected to the second positive line and the negative line, a negative connection relay capable of connecting and disconnecting a negative electrode of the second battery to and from a negative side power line of the second inverter, a charging connector, and a control device for turning on the negative connection relay.

Inventors

• ICHIDA SATOSHI

Assignees

• 丰田自动车株式会社

Dates

Publication Date

20260508

Application Date

20251014

Priority Date

20241101

Claims (5)

1. 1. A power supply system includes a first battery and a second battery, The power supply system is provided with: A motor having three-phase coils; A first inverter connected to the first battery via a first positive line and a negative line, and connected to one end side of the three-phase coil; a second inverter connected to the second battery via a second positive line and the negative line, and connected to the other end side of the three-phase coil; a first capacitor connected to the first positive line and the negative line; A second capacitor connected to the second positive line and the negative line; a negative electrode connection relay attached to the negative electrode line, the negative electrode connection relay being capable of connecting and disconnecting a negative electrode terminal of the second battery to and from a negative side power supply line of the second inverter; A charging connector connected to the first positive electrode line and the negative electrode line and capable of being electrically connected to a charging device, and And a control device that turns on the negative electrode connection relay when discharging the first capacitor or the second capacitor.
2. 2. The power supply system according to claim 1, wherein, The power supply system is provided with: A first positive electrode relay attached to the first positive electrode line and capable of connecting and disconnecting the first battery to and from the first inverter and the first capacitor, and A second positive electrode relay attached to the second positive electrode line, capable of connecting and disconnecting the second battery to and from the second inverter and the second capacitor, The control device is configured to, when discharging the first capacitor, turn on and fix the upper arm of the first inverter and turn off and fix the lower arm of the second inverter in a state where the first positive electrode relay and the second positive electrode relay are turned off and the negative electrode connection relay is turned on, and turn on and fix the lower arm of the first inverter and turn off and fix the upper arm of the second inverter in a state where the first positive electrode relay and the second positive electrode relay are turned off and the negative electrode connection relay is turned on when discharging the second capacitor.
3. 3. A power supply system includes a first battery and a second battery, The power supply system is provided with: A motor having three-phase coils; A first inverter connected to the first battery via a first positive line and a negative line, and connected to one end side of the three-phase coil; a second inverter connected to the second battery via a second positive line and the negative line, and connected to the other end side of the three-phase coil; a first capacitor connected to the first positive line and the negative line; A second capacitor connected to the second positive line and the negative line; The positive electrode connecting relay is arranged on a positive electrode connecting wire for connecting the first positive electrode wire and the second positive electrode wire; a negative electrode connection relay attached to the negative electrode line, the negative electrode connection relay being capable of connecting and disconnecting a negative electrode terminal of the second battery to and from a negative side power supply line of the second inverter; a first positive electrode relay attached to the first positive electrode line, the first positive electrode relay being capable of connecting and disconnecting the first battery to and from the first inverter and the first capacitor; A second positive electrode relay attached to the second positive electrode line, the second positive electrode relay being capable of connecting and disconnecting the second battery to and from the second inverter and the second capacitor; A charging connector connected to the first positive electrode line and the negative electrode line and capable of being electrically connected to a charging device, and And a control device that turns off the first positive electrode relay, the second positive electrode relay, and turns on the positive electrode connection relay and the negative electrode connection relay when discharging the first capacitor and the second capacitor.
4. 4. The power supply system according to claim 3, wherein, The control device performs PWM control of the first inverter and the second inverter in a state where the first positive electrode relay and the second positive electrode relay are turned off and the positive electrode connection relay and the negative electrode connection relay are turned on.
5. 5. A power supply system according to claim 2 or 3, wherein, The control device determines whether welding occurs in at least one of the first positive electrode relay and the second positive electrode relay based on the voltage of the first capacitor or the second capacitor at the time of discharging.

Description

Power supply system Technical Field The present disclosure relates to a power supply system. Background A driving device including first and second power storage devices, a motor having three-phase coils, and first and second inverters is proposed (for example, refer to japanese patent application laid-open No. 2020-5394). The first and second inverters are connected to first and second power lines to which the first and second power storage devices are connected, and are connected to one end side and the other end side of the three-phase coil, and each of the first and second inverters has a plurality of first and second switching elements. Disclosure of Invention The power supply system includes a motor having three-phase coils, a first inverter, a second inverter, a first capacitor, and a second capacitor. The first inverter is connected to the first battery via a first positive electrode line and a first negative electrode line, and is connected to one end side of the three-phase coil. The second inverter is connected to the second battery via a second positive electrode line and a second negative electrode line, and is connected to the other end side of the three-phase coil. The first capacitor is connected to the first positive line and the first negative line. The second capacitor is connected to the second positive line and the second negative line. In such a power supply system, it is considered to be an important issue to perform stable discharge of the first capacitor or the second capacitor. The main purpose of the power supply system of the present disclosure is to perform stable discharge of the first capacitor or the second capacitor. To achieve the above-described main object, the power supply system of the present disclosure adopts the following means. The first power supply system of the present disclosure is a power supply system provided with a first battery and a second battery, and is provided with: A motor having three-phase coils; A first inverter connected to the first battery via a first positive line and a negative line, and connected to one end side of the three-phase coil; a second inverter connected to the second battery via a second positive line and the negative line, and connected to the other end side of the three-phase coil; a first capacitor connected to the first positive line and the negative line; A second capacitor connected to the second positive line and the negative line; a negative electrode connection relay attached to the negative electrode line, the negative electrode connection relay being capable of connecting and disconnecting a negative electrode terminal of the second battery to and from a negative side power supply line of the second inverter; A charging connector connected to the first positive electrode line and the negative electrode line and capable of being electrically connected to a charging device, and And a control device that turns on the negative electrode connection relay when discharging the first capacitor or the second capacitor. In the first power supply system of the present disclosure, by such a configuration, stable discharge of the first capacitor or the second capacitor can be performed. A power supply system according to a second aspect of the present disclosure includes a first battery and a second battery, The power supply system is provided with: A motor having three-phase coils; A first inverter connected to the first battery via a first positive line and a negative line, and connected to one end side of the three-phase coil; a second inverter connected to the second battery via a second positive line and the negative line, and connected to the other end side of the three-phase coil; a first capacitor connected to the first positive line and the negative line; A second capacitor connected to the second positive line and the negative line; The positive electrode connecting relay is arranged on a positive electrode connecting wire for connecting the first positive electrode wire and the second positive electrode wire; a negative electrode connection relay attached to the negative electrode line, the negative electrode connection relay being capable of connecting and disconnecting a negative electrode terminal of the second battery to and from a negative side power supply line of the second inverter; a first positive electrode relay attached to the first positive electrode line, the first positive electrode relay being capable of connecting and disconnecting the first battery to and from the first inverter and the first capacitor; A second positive electrode relay attached to the second positive electrode line, the second positive electrode relay being capable of connecting and disconnecting the second battery to and from the second inverter and the second capacitor; A charging connector connected to the first positive electrode line and the negative electrode line and capable of being electrically connected to a charging device, an