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US 6,380,847 B1Granted
Control circuit for a vibrating membrane
AssigneeSGS-Thomson Microelectronics S.A.
InventorsAndré Bremond, Philippe Merceron
Life of this patent
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Abstract
The present invention relates to a control circuit of a vibrating membrane excited by a solenoid in series with a d.c. supply and a controlled switch. A capacitor is disposed across a series circuit including the solenoid and the switch associated with opening means in the vicinity of a zero crossing of the current in the inductance.
Claims4
A circuit for a vibrating membrane excited by a solenoid in series with a d.c. power supply and a control switch, comprising:
- a capacitor disposed across a series circuit including the solenoid and the control switch;
- and
- means for opening the control switch in a vicinity of a zero crossing of a current in the solenoid;
- wherein the control switch includes a thyristor disposed between a first terminal of the capacitor and a first terminal of the solenoid, a gate of the thyristor being connected to the first terminal of the capacitor by a zener diode and the gate of the thyristor being connected to a cathode of the thyristor via a resistor, the thyristor intrinsically forming the opening means in the vicinity of the zero crossing of the current.
1 more element
A circuit for a vibrating membrane excited by a solenoid in series with a d.c. power supply and a control switch, comprising:
- a capacitor disposed across a series circuit including the solenoid and the control switch;
- and
- means for opening the control switch in a vicinity of a zero crossing of a current in the solenoid;
- wherein the control switch includes a thyristor disposed between a first terminal of the capacitor and a first terminal of the solenoid, the gate of the thyristor being connected to the first terminal of the capacitor by a threshold device, and the gate of the thyristor being connected to a cathode of the thyristor via a resistor, the thyristor intrinsically forming the opening means in the vicinity of the zero crossing of the current.
1 more element
Dependencies are inferred from the claim text.