Device for starting automatically an auxiliary unit when switching on a main unit
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Jun 9, 1992
Issued Date -
N/A
app pub date -
Sep 13, 1991
filing date -
Jul 5, 1988
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
In connection with an automatic starting feature for an auxiliary unit, preferably a vacuum cleaner, which is switched on simultaneously when a main unit, for example an electric hand tool, a machine tool, or the like, is started it is proposed to trigger a conventional (phase) control circuit provided for the auxiliary unit by means of a current sensor taking the form of a ring-core bushing transformer in a manner such that the electric motor of the auxiliary unit is switched on with a certain delay (smooth-starting feature). The ring-core bushing transformer is designed in such a manner that, for producing clear firing pulses for the triac of the auxiliary unit, the primary winding is formed by the one turn of the electric supply line of the main unit and passed through the central opening of the ring core. The design of the ring-core bushing transformer is such that the transformer assumes the state of saturation when a predetermined output threshold value is reached so that even very high primary currents caused by the main unit during operation will not overdrive the (phase) control circuit and, in particular, not damage the triac.
First Claim
Family
International Classification(s)
Cited Art Landscape
Patent Citation Ranking
Recipient Email Address
Recipient Email Address
Comment
Recipient Email Address
Add to Portfolio(s)
To add this patent to one, or more, of your portfolios, simply click the add button.
This Patent is in these Portfolios:
Add to additional portfolios:
Last Refreshed On:
Changes done successfully