Field effect transistor switched temperature control circuit
AssigneeHoneywell Inc.
InventorArlon D. Kompelien
Life of this patent
Estimating the term…
Abstract
Two field effect transistor device means are utilized in conjunction with a special type of transformer having a low impedance primary winding and a high impedance primary winding to energize a secondary circuit to supply power for operating the electronics. The energy storage means for the field effect transistor device means is kept charged either directly from the line or through a voltage in the primary windings of the special transformer when the load switching field effect transistor device means is conducting.
Claims10
A temperature control circuit adapted to control field effect transistor device means to switch an alternating current potential to operate temperature control load means, including:
- field effect transistor device means including input switching circuit means and output means with said field effect transistor device means being capable of being switched between conductive and non-conductive states;
- transformer means including low impedance primary winding means, high impedance primary winding means, and secondary winding means with said three winding means being magnetically coupled;
- said field effect device output means and said low impedance winding means adapted to be connected in a series circuit with said load means and said source of alternating current potential;
- energy storage means and series connected rectifier means connected in parallel with said field effect transistor device output means and said low impedance transformer winding means;
- second field effect transistor device means including input switching circuit means and output means with said second field effect transistor device means being capable of being switched between conductive and non-conductive states;
- said second field effect transistor device output means in series circuit with said high impedance primary transformer winding means connected in parallel circuit with said energy storage means and said rectifier means;
- second rectifier means connected from said energy storage means to said second field effect transistor device output means;
- power supply means having an input connected to said transformer secondary winding to receive power therefrom and having direct current potential output means;
- temperature responsive control means having an input connected to said direct current potential output means to power said temperature responsive control means;
- and temperature responsive control output means connected to both of said field effect transistor device means input switching circuit means to differentially control said field effect transistor device means.
Dependencies are inferred from the claim text.