Patent ID: 6765333
Filing Date: 2004-07-20
Classification: A61C

Abstract:
A device for servo-control of a dental handpiece, comprising:a supply means (1) with supply output terminals (A, B) and supply input terminals (I, J), the supply input terminals supplied with a supply input voltage (Vr); a work circuit supplied by the supply means and with output terminals (S1, S2) connected to input terminals (E1, E2) of a dental handpiece (5) and with a first inductance (Ls) connected in parallel between the output terminals of the work circuit; and a control circuit comprising an intensity transformer (T2) with a primary (7) arranged in series with the work circuit and a secondary (11) in series with a capacitor (13) and a resistor (15), the secondary in series with the capacitor and the resistor forming an RLC circuit, terminals of the resistor being connected to the supply input terminals of the supply means so that a voltage at the terminals of the resistor is the supply input voltage, wherein, the supply means is adapted to deliver, at the supply output terminals, a supply output voltage (Vs) in phase with the supply input voltage applied at the supply input terminals, and one of the capacitor and a self-induction coil of the secondary of the intensity transformer are to providing one of a variable capacitance and a variable inductance.