# US 8,541,973 B2 · Single stage low boost/buck ratio stand-alone solar energy power generating circuit and system thereof

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- Number: US 8,541,973 B2
- Document ID: US8541973B2
- Status: Granted
- Kind: B2
- Application number: 12/623,433
- Filed: 2009-11-22
- Published: 2011-01-20
- Granted: 2013-09-24
- Earliest claimed: 2009-07-15
- Assignees: Richtek Technology Corporation
- Applicants: Sheng-Yu Tseng; Ying-Jhih Wu; Kuo-Chi Lin
- Inventors: Sheng-Yu Tseng; Ying-Jhih Wu; Kuo-Chi Lin
- Web page: https://patentgrep.com/patent/US8541973B2

## CPC

- H02J 7/35: with light sensitive cells
- H02M 3/1582: {Buck-boost converters (H02M3/1584 takes precedence)}
- H02J 2207/20: Charging or discharging characterised by the power electronics converter
- H02J: ELECTRIC POWER NETWORKS; CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02M: APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF (transformers H01F; dynamo-electric converters H02K47/00; controlling transformers, reactors or choke coils, control or regulation of electric motors, generators or dynamo-electric converters H02P)

## Abstract

A single stage low boost/buck ratio stand-alone solar energy power generating circuit with a system thereof is a simplification of a two-stage type circuit. The two-stage circuit, which has a storage unit, a charging converter circuit for charging the storage unit, and a discharging converter circuit for discharging the stored power to a load, is analyzed and categorized such that a circuit structure is selected via a suitable simplified combination to commonly use the elements constituting the charging and the discharging converter circuits so as to form the single stage circuit with less elements, volume and weight for reducing the production cost of the circuit.

## Claims

### Claim 1

A single stage low boost/buck ratio stand-alone solar energy power generating circuit, which is suitable for storing a power generated from a solar energy power generating unit and supplying said power to a load unit, comprising:
a storage unit;
a plurality of elements joining with the storage unit to act as a charging converter for storing said power generated from said solar energy power generating unit in said storage unit and a discharging converter for supplying the power stored in said storage unit to said load unit;
wherein the charging and discharging converters are synchronous rectifying Buck-Boost converters respectively;
wherein some of the elements are commonly owned by the two converters, and the two converters share the commonly owned elements.

### Claim 2

A single stage low boost/buck ratio stand-alone solar energy power generating circuit, which is suitable for storing a power generated from a solar energy power generating unit and supplying said power to a load unit, comprising:
a storage unit;
a plurality of elements joining with the storage unit to act as a charging converter for storing said power generated from said solar energy power generating unit in said storage unit and a discharging converter for supplying the power stored in said storage unit to said load unit;
wherein said charging and discharging converters are a synchronous rectifying Zeta converter and a synchronous rectifying Sepic converter;
wherein some of the elements are commonly owned by the two converters, and the two converters share the commonly owned elements.

### Claim 3

A single stage low boost/buck ratio stand-alone solar energy power generating system comprising:
a solar energy power generating unit for generating a power;
a load unit;
an energy storage unit;
a plurality of elements joining with the preceding units to act as a charging converter for storing the power generated from said solar energy power generating unit in said storage unit and a discharging converter for supplying the power stored in said storage unit to said load unit;
wherein said charging and discharging converters are synchronous rectifying Buck-Boost converters respectively;
wherein some of the elements are commonly owned by the two converters, and the two converters share the commonly owned elements.

### Claim 4

A single stage low boost/buck ratio stand-alone solar energy power generating system comprising:
a solar energy power generating unit for generating a power;
a load unit;
an energy storage unit;
a plurality of elements joining with the preceding units to act as a charging converter for storing the power generated from said solar energy power generating unit in said storage unit and a discharging converter for supplying the power stored in said storage unit to said load unit;
wherein said charging and discharging converters are a synchronous rectifying Zeta converter and a synchronous rectifying Sepic converter;
wherein some of the elements are commonly owned by the two converters, and the two converters share the commonly owned elements.

### Claim 5 (depends on 3)

The single stage low boost/buck ratio stand-alone solar energy power generating system as defined in claim 3, wherein said load unit further comprises a load and a switch serially connecting with said load.

### Claim 6 (depends on 4)

The single stage low boost/buck ratio stand-alone solar energy power generating system as defined in claim 4, wherein said load unit further comprises a load and a switch serially connecting with said load.