POWER SUPPLY METHOD WITH PARALLEL-CONNECTED BATTERIES

• US 20110285208A1
• Filed: 05/24/2010
• Published: 11/24/2011
• Est. Priority Date: 05/24/2010
• Status: Active Grant

• Current Assignee: Xiamen Lanxi Technology Company Limited
• Original Assignee: Xiamen Lanxi Technology Company Limited
• Inventors: XIAO, YAN YI
• Granted Patent: US 8,294,295 B2
• Time in Patent Office: Days
• US Class Current: 307/82
• CPC Class Codes: H02J 1/102 being switching converters H02J1/108, H02J1/12 take precedence
• CPC Class Codes: H02J 1/108 using diodes blocking reverse current flow H02J1/12 takes precedence

Abstract

A power supply method with parallel-connected batteries employs at least two parallel-connected power supply branches, each of which includes a battery, a step-up circuit, and a step-down circuit, and each of which is installed with an individual control unit. The battery offers a low voltage transformed into a high voltage via the stepping-up. The high voltage thence acquires a needed power-supply voltage through the transformation executed by the step-down circuit. An anode of an output of the power supply branch serially connected with a diode prevents the other power supply branch from a reverse current. A cathode of the output serially connected with a current limiting resistance balances the currents on each power supply branch. Accordingly, the present invention diminishes the workload of the device maintenance, lessens users'"'"' investment pressure, and provides electricity systems of the power plant and the substation with a consistent direct current power source.

Claims

1. A power supply method with parallel-connected batteries;

characterized in that at least two power supply branches being connected parallelly;

each power supply branch including batteries, a step-up circuit, and a step-down circuit, and each power supply branch further being installed with an individual control unit;

said batteries providing a low voltage that would be transformed into a high voltage via said step-up circuit, thereby permitting said high voltage to be transformed to a desired power-supply voltage via said step-down circuit;

an output of said power supply branch being serially connected with a diode for preventing another power supply branch from a reverse current;

a cathode of said out put being serially connected with a current limiting resistance for balancing currents generated from each of said power supply branches.

2. The power supply method as claimed in claim 1, wherein, said step-up circuit adopts a push-pull circuit, said step-down circuit adopts a BUCK circuit, and said control unit adopts a digital signal processing unit DSP.

3. The power supply method as claimed in claim 2, wherein, said push-pull circuit includes two field effective transistors, a transformer, four switch diodes, a filter inductance, and a capacitor;

said two field effective transistors implement an alternate conduction, and said transformer senses a pulse current with said high voltage;

whereby, said pulse current passes through a bridge-rectifier circuit including four switch diodes so as to go through the filter inductance, thence achieving a high voltage at two ends of the capacitor.

4. The power supply method as claimed in claim 2, wherein, said BUCK circuit includes a field effective transistor, a switch diode, an inductance, and a capacitor;

in time of a conduction introduced by said field effective transistor, said inductance stores the magnetic field energy and recharges said capacitor via said inductance lowering said voltage, thereby concurrently providing a load with electricity;

a cutting-off of the field effective transistor allows the conduction of said diodes to be implemented and permits the switch diodes, said inductance, and said capacitor to form a circuit;

said magnetic field energy stored in the inductance preferably charges said capacitor, so that said capacitor is able to provide said load with electricity and provide two ends thereof with needed power supply voltage via the alternate conduction of said field effective transistor.

5. The power supply method as claimed in claim 2, wherein, said digital signal processing unit DSP is connected to all gate electrodes of said field effective transistor and to all anodes of said two capacitors as well as to two ends of said current limiting resistance;

said digital signal processing unit DSP controls said alternate conductions of said two field effective transistors in said push-pull circuit;

according to a feedback voltage of said anodes on said two capacitors and a feedback current of two ends of said current limiting resistance, a space ratio of said field effective transistor of said BUCK circuit is able to be adjusted, thereby promoting the power supply performance of said power supply branches via clamping down said power supply voltage on a needed value and maintaining a current stability of said power supply branches.