Variable pulse recharging battery pack

An electrically powered device, including a removable rechargeable battery pack for powering said electrically powered device, said battery pack comprising:

• at least one rechargeable battery;
• and
• a transformerless pulse charging circuit for receiving an input AC current and a current value from said at least one battery, generating a pulse charging current proportional to said received AC current and current value, and charging said at least one rechargeable battery by applying said pulse charging current to said at least one battery, said pulse charging circuit further comprising:
• a rectifier circuit means for fully rectifying the received AC current;
• a semiconductor switching means coupled to the rectified circuit means for generating said pulse charging current from said rectified AC current and supplying said pulse charging current to said at least one battery;
• a ramp generator circuit, coupled to said rectified circuit means, for generating a linearly rising waveform beginning at each zero crossing of the rectified AC current;
• a current sense amplifier circuit, coupled to the output terminal of said at least one battery, for measuring the average value of current through said at least one battery and generating a first DC level value proportional to said average charging value;
• and
• a triggering circuit for generating gate firing pulses for the semiconductor switching means according to said linearly rising waveform and said generated DC level value.

A cellular phone, including a removable rechargeable battery pack, said battery pack comprising:

• at least one rechargeable battery;
• and
• a transformerless pulse charging circuit for receiving an input AC current and a current value from said at least one battery, generating a pulse charging current proportional to said received AC current and current value, and charging said at least one rechargeable battery by applying said pulse charging current to said at least one battery, said pulse charging circuit comprising:
• a rectifier circuit means for fully rectifying the received AC current;
• a semiconductor switching means coupled to the rectifier circuit means for generating said pulse charging current from said rectified AC current and supplying said pulse charging current to said at least one battery;
• a ramp generator circuit, coupled to said rectifier circuit means, for generating a linearly rising waveform beginning at each zero crossing of the rectified AC current;
• a current sense amplifier circuit, coupled to the output terminal of said at least one battery, for measuring the average value of current through said at least one battery and generating a first DC level value proportional to said average charging value;
• and
• a triggering circuit for generating gate firing pulses for the semiconductor switching means according to said linearly rising waveform and said generated DC level value.

A cellular phone removable battery pack, comprising:

• at least one rechargeable battery;
• and
• a transformerless pulse charging circuit for receiving an input AC current and a current value from said at least one battery, generating a pulse charging current proportional to said received AC current and current value, and charging said at least one rechargeable battery by applying said pulse charging current to said at least one battery, said pulse charging circuit further comprising:
• a rectifier circuit means for fully rectifying the received AC current;
• a semiconductor switching means coupled to the rectifier circuit means for generating said pulse charging current from said rectified AC current and supplying said pulse charging current to said at least one battery;
• a ramp generator circuit, coupled to said rectifier circuit means, for generating a linearly rising waveform beginning at each zero crossing of the rectified AC current;
• a current sense amplifier circuit, coupled to the output terminal of said at least one battery, for measuring the average value of current through said at least one battery and generating a first DC level value proportional to said average charging value;
• and
• a triggering circuit for generating gate firing pulses for the semiconductor switching means according to said linearly rising waveform and said generated DC level value.