Patents by Inventor Kouzo Ichimaru

Kouzo Ichimaru has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Temperature compensated constant-voltage circuit and temperature compensated constant-current circuit
    Patent number: 5430395
    Abstract: A constant-voltage circuit which can be driven by a low voltage (lower than 1 V) of a nickel-cadmium battery, etc., and which provides a temperature-compensated stable voltage output. The constant-voltage circuit comprises battery 1, band-gap-type current-mirror-type constant-current source circuit 3 which outputs collector current I.sub.C9 of transistor Q.sub.9 with a positive temperature coefficient, current source circuit 5 which outputs collector current I.sub.C8 of transistor Q.sub.8 having a negative temperature coefficient and defined by base-emitter voltage V.sub.BEQ7 of transistor Q.sub.7, and a load resistor element R.sub.0. At node N.sub.0, collector current I.sub.C9 and collector current I.sub.C8 are added. The temperature coefficients of these two currents cancel each other. Consequently, the current at node N.sub.0 does not have temperature dependence. Load resistor element R.sub.0 converts this current to a voltage as the output voltage V.sub.OUT.
    Type: Grant
    Filed: February 26, 1993
    Date of Patent: July 4, 1995
    Assignee: Texas Instruments Incorporated
    Inventor: Kouzo Ichimaru