Battery charging system including current observer circuitry to avoid battery voltage overshoot based on battery current draw

A battery charging system, comprising:

• output control circuitry configured to generate a control signal to control the conduction state of an output transistor;
• voltage loop circuitry configured to generate a feedback signal to the output control circuitry based on a battery charging condition and adjust the control signal based on the feedback signal;
• and
• current monitoring circuitry configured to adjust the feedback signal when a decrease in battery current draw exceeds a predetermined threshold, wherein the output circuitry is configured to adjust the control signal faster than the voltage loop circuitry.

A method for controlling a battery charging system, comprising:

• generating, using PWM circuitry in said battery charging system, a pulse width modulation (PWM) signal having a controllable duty cycle;
• generating, using voltage feedback loop circuitry in said battery charging system, a feedback signal to said PWM circuitry based on a battery charging condition;
• adjusting said duty cycle of said PWM signal based on said feedback signal in said PWM circuitry;
• and
• adjusting, using current monitoring circuitry in said battery charging system, said feedback signal when a decrease in battery current draw exceeds a predetermined threshold, wherein the current monitoring circuitry adjusts the duty cycle of the PWM signal faster than the voltage feedback circuitry.

A method for controlling a battery charging system, comprising:

• generating, using output control circuitry in said battery charging system, a control signal to control the conduction state of an output transistor;
• generating, using voltage loop circuitry in said battery charging system, a feedback signal to the output control circuitry based on a battery charging condition;
• adjusting the control signal based on the feedback signal;
• and
• adjusting, using current monitoring circuitry in said battery charging system, the feedback signal when a decrease in battery current draw exceeds a predetermined threshold, wherein the output circuitry adjusts the control signal faster than the voltage loop circuitry.