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Capacitive load driving device

  • US 4,733,106 A
  • Filed: 04/01/1985
  • Issued: 03/22/1988
  • Est. Priority Date: 03/30/1984
  • Status: Expired due to Term
First Claim
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1. A device for driving a capacitive load in response to an external control signal, comprising:

  • charging circuit means being connectable with the capacitive load for charging the latter and including a switching element, said switching element being arranged to be rendered electrically conductive to supply a charge current to the capacitive load when the device receives said control signal; and

    discharging circuit means connectable with the capacitive load for discharging the latter with a discharge current passing therethrough when said control signal ceases, said discharging circuit means including means for generating a cutoff signal from said discharge current and applying the cutoff signal to said switching element to ensure turn-off of said switching element, in which said switching element is constituted by a unidirectional tetrode thyristor having an anode connectable with a power source, a cathode connectable with the capacitive load, a first gate for receiving said control signal and a second gate, and said cutoff signal generating means is constituted by a diode having its anode connected with the cathode of said thyristor and its cathode connected with said second gate.

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