Power supply device

Patent metadata

Field	Value
Publication number	US-9831671-B2
Application number	US-201214441894-A
Country	US
Kind code	B2
Filing date	Nov 9, 2012
Priority date	Nov 9, 2012
Publication date	Nov 28, 2017
Grant date	Nov 28, 2017

Abstract

A power supply device for supplying power to a load by combining a secondary battery and a capacitor includes a switching element which switches the supply of power to the load from the capacitor, a DC-DC converter which enables a voltage of the capacitor to be stepped up and supplied to the load and a control unit which enables power to be supplied to the load by pulse-controlling the switching element, controlling the DC-DC converter to output a pulse current alternately with the switching element and combining the alternately output pulse currents if the voltage of the capacitor drops below a minimum voltage capable of driving the load.

First claim

The embodiments of this invention in which an exclusive property or privilege is claimed are defined as follows:

1. A power supply device for supplying power to a load by combining a secondary battery and a capacitor, comprising:
a switching element adapted to switch the supply of power to the load from the capacitor;
a DC-DC converter adapted to enable a voltage of the secondary battery to be stepped up and supplied to the load; and
a control unit adapted to enable power to be supplied to the load by pulse-controlling the switching element, controlling the DC-DC converter to output a pulse current alternately with the switching element and combining the alternately output pulse currents if the voltage of the capacitor drops below a minimum voltage capable of driving the load.

2. The power supply device according to claim 1 , wherein:
the DC-DC converter increases a gain for stepping up a voltage of the secondary battery according to a voltage drop of the capacitor.

3. The power supply device according to claim 1 , wherein:
the switching element enables power to be continuously supplied to the load from the capacitor if the voltage of the capacitor is a voltage capable of driving the load.

4. The power supply device according to claim 1 , wherein:
the control unit enables power to be supplied to the load by pulse-controlling the switching element, controlling the DC-DC converter to output a pulse current alternately with the switching element and combining the alternately output pulse currents if the voltage of the capacitor becomes lower than a voltage higher than the minimum voltage capable of driving the load by a margin voltage.

5. The power supply device according to claim 1 , wherein:
the control unit enables power to be continuously supplied to the load from the secondary battery by switching the switching element to a shut-off state and controlling the DC-DC converter if the voltage of the capacitor becomes lower than a voltage higher than a minimum operating voltage of the capacitor by a margin voltage.

Assignees

• Volvo Truck Corp

Inventors

• Yamada Yoshiaki
• Tsuchiya Takayuki
• Hikiri Kunihiko
• Itani Koichi
• Toyama Hiroshi
• Miyake Noriaki

Classifications

• B60L15/2009

  for braking · CPC title

• H02M7/5387

  in a bridge configuration · CPC title

• B60L58/20

  having different nominal voltages · CPC title

• B60L2210/14

  Boost converters · CPC title

• H02J7/345

  using capacitors as storage or buffering devices · CPC title