Solar power charging system

• US 6,429,621 B1
• Filed: 12/28/2001
• Issued: 08/06/2002
• Est. Priority Date: 12/28/2000
• Status: Expired due to Fees

• Current Assignee: NEC Tokin Corporation (Yageo Corporation)
• Original Assignee: NEC Corporation
• Inventors: Arai, Satoshi
• Primary Examiner(s): Tso, Edward H.
• Application Number:
  US10/029,298
• Publication Number:
  US 20020084767A1
• Time in Patent Office: 221 Days
• Field of Search: 320/101, 320/128, 320/135, 320/137, 323/906, 136/243, 136/291, 136/293
• US Class Current: 320/101
• CPC Class Codes: H02J 7/35 with light sensitive cells
• CPC Class Codes: H02M 3/005 using Cuk converters
• CPC Class Codes: H02M 3/1563 without using an external clock H02M3/158 takes precedence
• CPC Class Codes: Y02E 10/56 Power conversion systems, e.g. maximum power point trackers

Abstract

A solar power charging system comprising: a voltage converter for converting a voltage level of all original voltage generated by a solar battery into generate a charging voltage and for charging a capacitor by the charging voltage; and a duty ratio control circuit electrically coupled to the voltage converter for supplying a driving clock to the voltage converter for allowing the voltage converter to operate based on the driving clock, wherein the duty ratio control circuit adjusts a duty ratio of the driving clock based on a maximum charge power which depends on the original voltage generated by the solar battery.

Claims

1. A solar power charging system comprising:

a voltage converter for converting a voltage level of an original voltage generated by a solar battery into generate a charging voltage and for charging a capacitor by said charging voltage; and

a duty ratio control circuit electrically coupled to said voltage converter for supplying a driving clock to said voltage converter for allowing said voltage converter to operate based on said driving clock,

wherein said duty ratio control circuit adjusts a duty ratio of said driving clock based on a maximum charge power which depends on said original voltage generated by said solar battery.

2. The solar power charging system as claimed in claim 1, wherein said voltage converter circuit generates a detected voltage, and said duty ratio control circuit receives a detected voltage, and said ratio control circuit adjusts said duty ratio based on said detected voltage in addition to said maximum charge power.

3. The solar power charging system as claimed in claim 1, wherein said duty ratio control circuit adjusts said duty ratio in accordance with a preset approximated line which is approximated with reference to a voltage-current characteristic curve of a maximum charging power of said solar battery.

4. The solar power charging system as claimed in claim 1, wherein said voltage converter is capable of rising said voltage level of said original voltage generated by said solar battery.

5. The solar power charging system as claimed in claim 1, wherein said voltage converter is capable of both rising falling said voltage level of said original voltage generated by said solar battery.

6. The solar power charging system as claimed in claim 1, wherein said capacitor comprises an electric double layer capacitor.