US 4,291,358 AGranted

Magnetic valve with electronic control

AssigneeBurkert S.A.S.

InventorsHeinrich Dettmann, Wolfgang Pfeiffer

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Abstract

The magnetic valve with electronic control for increasing the attractive output has an energizing coil (AE), which is supplied in the attracting phase with an increased energizing current via a closed switch (T2). In the maintenance phase, the energizing coil (AE) is supplied with a maintenance current, via a compensating resistor (RV) and with the switch (T2) opened, which is lower than the energizing current. For the purpose of controlling the switch (T2), a timing circuit is provided which includes a resistor (R2) and a capacitor (C2). The magnetic valve is selectively drivable with alternating current or direct current. A portion of the energizing coil (AE) is made up of the compensating resistor (RV), which is embodied as a resistor wire and wound up on the energizing coil (AE).

Claims5

Dependent claims

An electronic control circuit for a magnetic valve having an energizing coil with two terminals for supplying an energizing current to said electronic control circuit comprising:

two input terminals for connection with said electric power source;
a full wave rectifier having two ac terminals and two dc terminals, said ac terminals being connected to said input terminals;
a current limiting resistor mounted between one of said dc terminals and one of said coil terminals, the other of said coil terminals being connected with the other of said dc terminals;
a transistor switch, mounted in parallel with said current limiting resistor and having a control terminal;
a biassing circuit for biassing said transistor switch into its conductive state during an initial energization period of said valve by providing a biassing current to said control terminal;
and
a timing circuit comprising a capacitor and a resistor for defining the duration of said initial energization period, said timing circuit being adapted to deactivate said biassing circuit at the end of said initial energization period.

4 more elements

Dependencies are inferred from the claim text.