Driving system

Patent metadata

Field	Value
Publication number	US-11097624-B2
Application number	US-201916396824-A
Country	US
Kind code	B2
Filing date	Apr 29, 2019
Priority date	Nov 8, 2016
Publication date	Aug 24, 2021
Grant date	Aug 24, 2021

Abstract

A driving system includes a first alternating-current rotary electrical machine and a second alternating-current rotary electrical machine. The driving system includes: a first inverter electrically connected to the first alternating-current rotary electrical machine; a second inverter electrically connected to a first end of each of phase windings constituting the second alternating-current rotary electrical machine; a step-up converter; and a third inverter that is electrically connected to a second end of each of the phase windings and transfers power to a second direct-current power source different from the first direct-current power source to drive the second alternating-current rotary electrical machine. The step-up converter raises an output voltage of the first direct-current power source and outputs the output voltage to the first inverter and the second inverter. The second direct-current power source and the first alternating-current rotary electrical machine are connected by a single connection route.

First claim

What is claimed is:

1. A driving system with a first alternating-current rotary electrical machine and a second alternating-current rotary electrical machine, comprising:
a first inverter that is electrically connected to the first alternating-current rotary electrical machine to drive the first alternating-current rotary electrical machine;
a second inverter that is electrically connected to a first end of both ends of each of phase windings constituting the second alternating-current rotary electrical machine to drive the second alternating-current rotary electrical machine;
a step-up converter that has a power source-side connection unit electrically connectable to a first direct-current power source and an inverter-side connection unit electrically connected to the first inverter via a first electrical path and electrically connected to the second inverter via a second electrical path, and raises an output voltage of the first direct-current power source and outputs the output voltage to the first inverter and the second inverter; and
a third inverter that is electrically connected to a second end of the both ends of each of the phase windings constituting the second alternating-current rotary electrical machine, and transfers power to a second direct-current power source different from the first direct-current power source to drive the second alternating-current rotary electrical machine, wherein
the second direct-current power source and the first alternating-current rotary electrical machine are connected by a single connection route,
a storage capacity of the first direct-current power source is set to be smaller than a storage capacity of the second direct-current power source, and
the driving system comprises a charger that is electrically connected only to the second direct-current power source of the first direct-current power source and the second direct-current power source to charge the second direct-current power source using an external power source provided outside the driving system as a source of power supply.

2. The driving system according to claim 1 , wherein maximum output power of the second direct-current power source is set to be larger than maximum output power of the first direct-current power source.

3. The driving system according to claim 1 , wherein an output voltage of the second direct-current power source is set to be lower than an output voltage of the first direct-current power source.

4. The driving system according to claim 3 , wherein
the step-up converter is configured to perform a step-down action of lowering a direct-current voltage input from the inverter-side connection unit and supplying the direct-current voltage to the first direct-current power source via the power source-side connection unit, and
the driving system comprises:
a switch unit that is provided in a connection path as an electrical path connecting the third inverter and the second direct-current power source, and when turned on, electrically connects between the third inverter and the second direct-current power source, and when turned off, electrically disconnects between the third inverter and the second direct-current power source;
a second capacitor as a smoothing capacitor that is electrically connected to the step-up converter side of the second inverter;
a third capacitor as a smoothing capacitor that is electrically connected to the second direct-current power source side of the third inverter;
a first discharge control unit that, when determining that a stop instruction signal for the driving system has been input, turns off the switch unit and then instructs the step-up converter to perform the step-down action and control the second inverter and the third inverter to charge the first direct-current power source with respective discharge power of the second capacitor and the third capacitor; and
a second discharge control unit that, after discharging from the second capacitor and the third capacitor in response to the instruction from the first discharge control unit, provides an instruction to control the second inverter and the third inverter to further discharge from the second capacitor and the third capacitor.

5. A driving system with a first alternating-current rotary electrical machine and a second alternating-current rotary electrical machine, comprising:
a first inverter that is electrically connected to the first alternating-current rotary electrical machine to drive the first alternating-current rotary electrical machine;
a second inverter that is electrically connected to a first end of both ends of each of phase windings constituting the second alternating-current rotary electrical machine to drive the second alternating-current rotary electrical machine;
a step-up converter that has a power source-side connection unit electrically connectable to a first direct-current power source and an inverter-side connection unit electrically connected to the first inverter via a first electrical path and electrically connected to the second inverter via a second electrical path, and raises an output voltage of the first direct-current power source and outputs the output voltage to the first inverter and the second inverter; and
a third inverter that is electrically connected to a second end of the both ends of each of the phase windings constituting the second alternating-current rotary electrical machine, and transfers power to a second direct-current power source different from the first direct-current power source to drive the second alternating-current rotary electrical machine, wherein
the second direct-current power source and the first alternating-current rotary electrical machine are connected by a single connection route,
an output voltage of the second direct-current power source is set to be lower than an output voltage of the first direct-current power source,
the step-up converter is configured to perform a step-down action of lowering a direct-current voltage input from the inverter-side connection unit and supplying the direct-current voltage to the first direct-current power source via the power source-side connection unit, and
the driving system comprises:
a switch unit that is provided in a connection path as an electrical path connecting the third inverter and the second direct-current power source, and when turned on, electrically connects between the third inverter and the second direct-current power source, and when turned off, electrically disconnects between the third inverter and the second direct-current power source;
a second capacitor as a smoothing capacitor that is electrically connected to the step-up converter side of the second inverter;
a third capacitor as a smoothing capacitor that is electrically connected to the second direct-current power source side of the third inverter;
a first discharge control unit that, when determining that a stop instruction signal for the driving system has been input, turns off the switch unit and then instructs the step-up converter to perform the step-down action and control the second inverter and the third inverter to charge the first direct-current power source with respective discharge power of the second capacitor and the third capacitor; and
a second discharge control unit that, after discharging from the second capacitor and the third capacitor in response to the instruction from the first discharge control unit, provides an instruction to control the second inverter and the third inverter to further discharge from the second capacitor and the third capacitor.

6. The driving system according to claim 1 , wherein
the driving system is mounted in a vehicle,
each of the first alternating-current rotary electrical machine and the second alternating-current rotary electrical machin

Assignees

• Denso Corp

Inventors

• Kobayashi Hisaaki

Classifications

• H02M1/008

  Plural converter units for generating at two or more independent and non-parallel outputs, e.g. systems with plural point of load switching regulators · CPC title

• B60K6/46

  Series type · CPC title

• Y02T10/70

  Energy storage systems for electromobility, e.g. batteries · CPC title

• B60L1/00

  Supplying electric power to auxiliary equipment of vehicles (circuit arrangements for charging batteries H02J7/00) · CPC title

• B60L9/18

  fed from DC supply lines · CPC title