Stepless control of a.c. power

Details Stepless control of a.c. power Stepless control of a.c. power

H - Electricity

02

J

323/34

H02J 3/00 (2006.01)

Patent

CA 1105083

ABSTRACT OF THE DISCLOSURE A power controller for substantially stepless manual control of electrical AC power to a load. The controller comprises power switch means and a bimetal member for intermittently operating the switch means. Means is provided for heating the bimetal member in dependence upon power supplied to the load via the power switch means. Manually operable control means conti- nuously acts on the bimetal member. A diode and auxiliary switch means is actuable by the control means for connect- ing the diode in circuit with the heating means only in an upper power range. The heating means receives only half wave power in the upper range but receives full wave power in a Lower power range. The heating means and the diode are operated with the full voltage of the AC power, whereby substantially stepless control is achieved despite the intermittent switching of the power.

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