Patent ID: 6707388
Filing Date: 2004-03-16
Classification: H02P,Y10S

Abstract:
A circuit for controlled return of a pointer of a display apparatus to a default position, said circuit comprising:a display apparatus having a scale arranged thereon and a pointer movably connected to said display apparatus for moving relative to said scale for indicating a value on said scale; a stepping motor operatively connected to said pointer for moving said pointer relative to said scale; a control circuit for actuating said stepping motor, said control circuit comprising an input for receiving a supply voltage; and at least one buffer capacitor having a capacitance and connected for buffering the supply voltage, said control circuit moving said pointer to a default position relative to the scale in response to a failure of the supply voltage, said capacitance being sized such that said at least one buffer capacitor supplies electrical power to said control circuit during the failure of the supply voltage at least until said control circuit moves said pointer to said default position, wherein said default position of said pointer comprises one of a zero position on said scale and another position indicating a noncritical value.