BATTERY POWER SYSTEM

• US 20120133309A1
• Filed: 04/29/2011
• Published: 05/31/2012
• Est. Priority Date: 11/25/2010
• Status: Active Grant

• Current Assignee: Industrial Technology Research Institute
• Original Assignee: Industrial Technology Research Institute
• Inventors: Sean, Wu-Yang, Chiang, Yi-Hsien
• Granted Patent: US 8,415,905 B2
• Time in Patent Office: Days
• US Class Current: 318/139
• CPC Class Codes: H02J 7/14 for charging batteries from dynamo-electric generators driven at varying speed, e.g. on vehicle
• CPC Class Codes: Y02T 10/70 Energy storage systems for electromobility, e.g. batteries

Abstract

A battery power system, adapted for driving a motor system of a power unit with respect to at least one power mode signal and at least one motor control signal generated from the motor system, which comprises: a battery pack, an electrolytic capacitor, a boost converter, a first contactor, a first switch, an ultracapacitor, a first diode, a second contactor, a second switch, a current limiting element, a plurality of measuring elements, and an electrical energy controller; wherein the electrical energy controller is enabled to analyze the electrical power level of the ultracapacitor according the power mode signal, the motor control signal and the voltage/current signals generated from the plural measuring elements while using the result of the analysis to control the current directions and conductivity of the boost converter, the first contactor, the second contactor, the first switch and the second switch so as to achieve a variety of control modes accordingly.

Claims

1. A battery power system adapted for driving a motor system of a power unit with respect to at least one power mode signal and at least one motor control signal generated from the motor system, the battery power system comprising:

a battery pack, having a battery positive terminal coupled to a positive terminal of a direct current (DC) link and a battery negative terminal coupled to a negative terminal of the direct current (DC) link, and the battery pack is a rechargeable battery, and the battery positive terminal and the battery negative terminal are electrically coupled to the motor system;

an electrolytic capacitor, coupled to the battery positive terminal and the battery negative terminal;

a boost converter, coupled the battery positive terminal and the battery negative terminal, for boost converting the power;

a first contactor, coupled to the battery negative terminal and the boost converter, and the first contactor has an on-state and an off-state;

a first switch, coupled to the battery negative terminal and the negative terminal of the DC link, and the first switch has an on-state and an off-state;

an ultracapacitor, having a positive terminal and a negative terminal, and the positive terminal of the ultracapacitor is coupled to the boost converter and the negative terminal of the ultracapacitor is coupled to the battery negative terminal;

a first diode, coupled the positive terminal and the negative terminal of the ultracapacitor;

a second contactor, coupled to the first diode and the positive terminal of the ultracapacitor, and the second contactor has an on-state and an off-state;

a second switch, coupled to the first diode and the positive terminal of the ultracapacitor, and the second switch has an on-state and an off-state;

a current limiting element, coupled to the second switch and the first diode;

a plurality of measuring elements, for measuring at least one voltage value and at least one current value, and generating at least one voltage signal and at least one current signal; and

a electrical energy controller, for receiving the power mode signal, the motor control signal, the voltage signal and the current signal, and analyzing the electrical power level of the ultracapacitor according the power mode signal, the motor control signal and the voltage/current signals generated from the plural measuring elements while using the result of the analysis to control the current directions and conductivity of the boost converter, the first contactor, the second contactor, the first switch and the second switch so as to achieve a variety of control modes accordingly.

2. The battery power system of claim 1, wherein the boost converter comprises a third switch, a second diode and an inductance element, and the third switch is serial connected with the second diode and coupled to the battery negative terminal, and the second diode is coupled to the battery positive terminal, and one terminal of the inductance element is coupled between the third switch and the second diode and another terminal of the inductance element is coupled to the first contactor, and the third switch has an on-state and an off-state.

3. The battery power system of claim 2, wherein the first switch, the second switch and the third switch are metal oxide semiconductor filed effect transistors (MOSFET) or insulated gate bipolar transistors (IGBT) or GaNs.

4. The battery power system of claim 1, wherein the first contactor and the second contractor are relay switches.

5. The battery power system of claim 1, wherein the current limiting element is a current limit resistor, current limit circuit or current limiter.

6. The battery power system of claim 1, wherein the power unit comprises a frequency changer, a motor and an electronic control unit, and the frequency changer is coupled to the motor, the electronic control unit, the positive terminal and the negative terminal of the DC link, and then transfers the power mode signal and the motor control signal to the electrical energy controller.

7. The battery power system of claim 1, wherein the plurality of measuring elements further comprises:

a first current measuring element, coupled to the positive terminal of the ultracapacitor, for measuring a current value of the ultracapacitor and generating a current signal of the ultracapacitor;

a second current measuring element, coupled to the positive terminal of the DC link, for measuring a current value at the positive terminal of the DC link and generating a current of the DC link;

a first voltage measuring element, coupled to the battery positive terminal and the battery negative terminal, for measuring a voltage value of the battery pack and generating a voltage signal of the battery pack;

a second voltage measuring element, coupled to the positive terminal and the negative terminal of the ultracapacitor, for measuring a voltage value of the ultracapacitor and generating a voltage signal of the ultracapacitor; and

a third voltage measuring element, coupled between the positive terminal and the negative terminal of the DC link, for measuring voltage values at the positive terminal and the negative terminal of the DC link and generating a voltage signal of the DC link;

wherein the electrical energy controller receives the voltage signals of the battery pack, the ultracapacitor, the DC link and the current signal of the DC link, and the electrical energy controller is enabled to control the states of the boost converter, the first contractor, the second contractor, the first switch and the second switch according the voltage signals and the current signal while using the signals to control the current directions so as to achieve a variety of control modes accordingly.

8. The battery power system of claim 1, wherein the control modes comprise a first mode, and the first contractor is the on-state and the boost converter, the second contactor, the first switch and the second switch are the off-states during the first mode, meanwhile the current direction is controlled to flow from the negative terminal of the DC link to the battery pack through the ultracapacitor, and then flow from the positive terminal to the motor system.

9. The battery power system of claim 1, wherein the control modes comprise a second mode, and the first switch is on-state and the boost converter, the first contactor, the second contactor and the second switch are the off-states during the second mode, meanwhile the current direction is controlled to flow from the negative terminal of the DC link to the battery pack, and then flow from the positive terminal of the DC link to the motor system.

10. The battery power system of claim 1, wherein the control modes comprise a third mode, and the first and second switches are the on-states and the boost converter, the first contactor and the second contactor are the off-states during the third mode, meanwhile the current direction is controlled to flow from the negative terminal of the DC link to the battery pack, wherein a part of current flows from the positive terminal of the DC link to the motor system, and another part of current flows to the ultracapacitor through the second switch after the current flow through the battery pack.

11. The battery power system of claim 1, wherein the control modes comprises a fourth mode, and the first switch and the boost converter are the on-states and the second switch, the first contactor and the second contactor are the off-states during the fourth mode, meanwhile the current direction is controlled to flow from the negative terminal of the DC link to the battery pack, and then flow from the positive terminal of the DC link to the motor system, wherein a part of current flows to the boost converter through the ultracapacitor, and the current from the boost converter respectively mingles with the current flowing in the negative terminal of the DC link and the current flowing from the positive terminal of the DC link to the motor system.

12. The battery power system of claim 1, wherein the control modes comprise a fifth mode, and the second contactor is the on-state and the boost converter, the first switch, the second switch and the first contactor are the off-state during the fifth mode, meanwhile the current direction is controlled to flow from the positive terminal of the DC link to the ultracapacitor, and then flows from the negative terminal of the DC link to the motor system.

13. The battery power system of claim 1, wherein the control modes comprise a sixth mode, and the first switch is the on-state and the boost converter, the first contactor, the second contactor and the second switch are the off-states during the sixth mode, meanwhile the current direction is controlled to flow from the positive terminal of the DC link to the battery pack, and then flows from the negative terminal of the DC link to the motor system.