초록 ▼

The resistors R1 and R2 are applied to terminals 1 and 8, respectively, of the switched-mode power supply 26. These resistors R1 and R2 are current-limiting resistors and function to control the output power and current. A standard buck regulator may be coupled to terminal 5 of the switched-mode pow

The resistors R1 and R2 are applied to terminals 1 and 8, respectively, of the switched-mode power supply 26. These resistors R1 and R2 are current-limiting resistors and function to control the output power and current. A standard buck regulator may be coupled to terminal 5 of the switched-mode power supply 26. The buck regulator includes a diode D7 and an inductor L1. The diode D7 and inductor L1 provide DC rectification and filtering of the high-frequency switch voltage from the switched-mode power supply 26.

대표청구항 ▼

What is claimed and desired to be secured by a Letters Patent of the United States is: 1. A battery charge indicator for sensing and indicating various states of charge of a lithium ion battery, the battery charge indicator comprising:a current sensing circuit for sensing charging current to said li

What is claimed and desired to be secured by a Letters Patent of the United States is: 1. A battery charge indicator for sensing and indicating various states of charge of a lithium ion battery, the battery charge indicator comprising:a current sensing circuit for sensing charging current to said lithium ion battery during a constant current mode of operation and a constant voltage mode of operation and providing a first charge indication signal based upon comparing the magnitude of said charging current with a first predetermined value and generating a first charge indication signal solely as a function of said charging current when said charging current is less than or equal to said first predetermined value, wherein said first predetermined value is representative of a first predetermined charge state representative of an initial state of charge of said lithium ion battery, said current sensing circuit providing a second charge indication signal based upon comparing the magnitude of said charging current with a second predetermined value and generating a second charge indication signal solely as a function of said charging current when said charging current is less than or equal to said second predetermined value, said current sensing circuit providing a third charge indication signal based upon comparing the magnitude of said charging current with a third predetermined value and generating a third charge indication signal in said constant voltage mode of operation solely as a function of said charging current when said charging current is less than or equal to said third predetermined value;a first indicator responsive to said first charge indication signal for providing an indication when said lithium ion battery is at an initial state of charge;a second indicator responsive to said second charge indication signal for providing an indication when said lithium ion battery is at a transitional state of charge; anda third indicator responsive to said third charge indication signal for providing an indication when said lithium ion battery is at a near full state of charge.