Power supply converter/s with controller/s responsive to voltage, current, and power

• US 8,058,748 B2
• Filed: 03/26/2009
• Issued: 11/15/2011
• Est. Priority Date: 09/05/2003
• Status: Active Grant

• Current Assignee: Sanyo Electric Company Limited (Panasonic Holdings Corporation)
• Original Assignee: Sanyo Electric Company Limited (Panasonic Holdings Corporation)
• Inventors: Kohnotoh, Masaaki, Kunimitsu, Tomonori
• Primary Examiner(s): PALADINI, ALBERT WILLIAM
• Application Number:
  US12/411,764
• Publication Number:
  US 20090184581A1
• Time in Patent Office: 964 Days
• Field of Search: 307/43, 307/52, 327/100, 323266-270
• US Class Current: 307/43
• CPC Class Codes: H02J 2207/20 Charging or discharging characterised by the power electronics converter
• CPC Class Codes: H02J 2300/30 The power source being a fuel cell
• CPC Class Codes: H02J 7/345 using capacitors as storage or buffering devices
• CPC Class Codes: H02M 1/0022 the disturbance parameters being input voltage fluctuations
• CPC Class Codes: H02M 3/1582 Buck-boost converters H02M3/1584 takes precedence

Abstract

Each of power supply units in a power supply system according to the present invention includes a power supply module, a voltage increase/decrease circuit for increasing the voltage across the power supply module and outputting the increased voltage to a load, and a control circuit. The control circuit calculates the power of the power supply module on the basis of the voltage across the power supply module and current flowing in the power supply module, outputs the power calculation result to a control circuit of another power supply unit, and generates and outputs a control signal to the voltage increase/decrease circuit on the basis of a target output voltage of the voltage increase/decrease circuit, the power calculation result, and a power calculation result obtained from a control circuit of a third power supply unit.

Claims

1. A power supply unit having a pair of input/output terminals to/from which power is to be input/output, and a power supply module to/from which power can be input/output, the power supply unit being connected to an external unit comprising at least one other power supply unit, the power supply unit comprising:

a current detection circuit for detecting current flowing in the power supply module;

a voltage adjustment circuit for increasing the voltage across the power supply module and outputting the increased voltage to the pair of input/output terminals or for decreasing the voltage between the pair of input/output terminals and outputting the decreased voltage across the power supply module; and

a control circuit for controlling operation of the voltage adjustment circuit, wherein the control circuit includes;

an output portion for outputting a current detection result of the current detection circuit as a first current detection result to the external unit; and

a control portion for generating a control signal on the basis of a target output voltage of the voltage adjustment circuit, the first current detection result, and a second current detection result obtained from the external unit, and for outputting the control signal to the voltage adjustment circuit.

2. The power supply unit according to claim 1, wherein the power supply module is constructed by a storage battery or a capacitor.

3. A power supply unit having a pair of input/output terminals from which power is to be output, and a power supply module from which power can be output, the power supply unit being connected to an external unit comprising at least one other power supply unit, the power supply unit comprising:

a current detection circuit for detecting current flowing in the power supply module;

a voltage adjustment circuit for increasing the voltage across the power supply module and outputting the increased voltage to the pair of input/output terminals; and

a control circuit for controlling operation of the voltage adjustment circuit, wherein the control circuit includes;

an output portion for outputting a current detection result of the current detection circuit as a first current detection result to the external unit; and

a control portion for generating a control signal on the basis of a target output voltage of the voltage adjustment circuit, the first current detection result, and a second current detection result obtained from the external unit, and for outputting the control signal to the voltage adjustment circuit.

4. The power supply unit according to claim 3, wherein the power supply module is constructed by a storage battery, a capacitor or a fuel cell.

5. A power supply system having a pair of connection terminals to which a load is to be connected, and having a plurality of power supply units connected in parallel with one another with respect to the pair of connection terminals, each of the power supply units comprising a power supply module capable of outputting power, each of the power supply units comprising:

a current detection circuit for detecting current flowing in the power supply module of the power supply unit itself;

a voltage adjustment circuit for increasing the voltage across the power supply module of the power supply unit itself and outputting the increased voltage to the pair of connection terminals; and

a control circuit for controlling operation of the voltage adjustment circuit,

the control circuits of all of the power supply units being connected to each other, wherein

in each power supply unit, the control circuit includes;

an output portion for outputting a current detection result of the current detection circuit in the power supply unit as a first current detection result to a connected control circuit; and

a control portion for generating a control signal on the basis of a target output voltage of the voltage adjustment circuit in the power supply unit, the first current detection result, and a second current detection result obtained from the connected control circuit or another connected control circuit, and for outputting the control signal to the voltage adjustment circuit in the power supply unit.

6. The power supply system according to claim 5, wherein

each of the power supply modules can also receive power and,

in each of the power supply units, the voltage adjustment circuit decreases voltage between the pair of connection terminals and outputs the decreased voltage across the power supply module of the power supply unit.

7. The power supply system according to claim 6, wherein

each power supply unit has a pair of power input/output terminals connected to the pair of connection terminals,

the voltage adjustment circuit includes:

an inductor provided for one of two serial lines extending from both ends of a power supply module to the pair of power input/output terminals;

a switching element for charging provided on the power input/output terminal side of the inductor of the one serial line and having a rectifier for setting a current direction at the time of discharging of the power supply module to a forward direction; and

a switching element for discharging provided for parallel lines for connecting the two serial lines to each other between the inductor and the switching element for charging and having a rectifier for setting the current direction at the time of charging the power supply module to a forward direction, and

the control portion of the control circuit generates a control signal for the switching element for charging and a control signal for the switching element for discharging.

8. The power supply system according to claim 6, wherein

a charging power supply for supplying power to power supply modules of the plurality of power supply units can be connected to the pair of connection terminals, and

each power supply unit has a charging control portion for generating and outputting a control signal to the voltage adjustment circuit in the power supply unit itself on the basis of target input current of the power supply module of the power supply unit itself and a detection result of the current detection circuit of the power supply unit itself when the charging power supply is connected to the pair of connection terminals.

9. The power supply system according to claim 6, wherein

a charging power supply for supplying power to power supply modules of the plurality of power supply units can be connected to the pair of connection terminals, and

the control circuit of each power supply unit has a charging control portion for generating and outputting a control signal to the voltage adjustment circuit in the power supply unit on the basis of target input current of the power supply module in the power supply unit and a detection result of the current detection circuit of the power supply unit when the charging power supply is connected to the pair of connection terminals.

10. The power supply system according to claim 5, wherein

the power supply module is constructed by a storage battery, a capacitor, or a fuel cell.