Method and apparatus for charge control of a portable terminal having a solar battery

An apparatus for controlling charging of a portable terminal having a solar battery, the apparatus comprising:

• a temperature sensing unit for measuring a temperature change;
• a comparator for outputting a first signal when a temperature is less than a preset reference temperature and outputting a second signal when the temperature is equal to or greater than the preset reference temperature;
• a controller for outputting, when the second signal is received from the comparator, a blocking signal for blocking a battery charging function provided by the solar battery;
• and
• a charging unit for blocking the battery charging function in response to the blocking signal from the controller.

A circuit for a managing a battery charging function in a portable terminal, the circuit comprising:

• a first voltage divider circuit comprising a first resistor and a second resistor, receiving a known input voltage level, wherein an output of the first voltage divider circuit represents a reference voltage level;
• a second voltage divider circuit comprising a third resistor and a temperature-varying resistor, receiving the known input voltage level, wherein an output of the second voltage divider circuit represents a temperature dependent voltage;
• a comparator having a first port and a second port, the first port receiving the reference voltage level and the second port receiving the temperature-dependent voltage, the comparator generating an output comprising one of a first state and a second state;
• and
• a charging unit, receiving the output of the comparator, wherein the charging unit allows charging of the battery when the comparator output is in the first state and blocks the charging of the battery when the comparator output is in the second state.