Patents Assigned to Alpha Smart, Inc.
  • Analog to digital voltage measuring device
    Patent number: 6348798
    Abstract: A voltage measuring circuit for measuring a voltage level of an unknown voltage source, including a capacitor configured for storing a charge from the unknown voltage source, a switch such as a transistor, configured to discharge the capacitor after the capacitor has reached a known threshold voltage, a microprocessor which controls the switch and measures the amount of time required to charge the capacitor to the threshold voltage, allowing the voltage level to be measured without disconnecting the capacitor from the circuit.
    Type: Grant
    Filed: December 5, 2000
    Date of Patent: February 19, 2002
    Assignee: Alpha Smart, Inc.
    Inventor: Bradley M. Daw