Electronic circuit for a single phase induction motor starting
First Claim
1. An electronic circuit for starting a single phase induction motor of the type having a cage type rotor and a stator with at least a main winding and a starting winding for operating on alternating current supplied from a source comprising,a permanent capacitor connected in series with the starting winding;
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a TRIAC trigger circuit formed by a first capacitor having one terminal connected to the second terminal of the TRIAC and another terminal connected to the GATE terminal of TRIAC through a first resistor;
a bilateral switch connected between the GATE terminal and the first terminal of the TRIAC, said switch having control terminals; and
a timer circuit connected to the control terminals of the bilateral switch and to the first and second circuit terminals of the alternating current source,said timer circuit defining the time elapsed from the motor powering up until the interruption of the TRIAC conduction caused by turning on the bilateral switch,the TRIAC trigger circuit repeatedly triggering the TRIAC to a turn on condition at the beginning of each current half-cycle while the bilateral switch remains cut off by the timer circuit.
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Accused Products
Abstract
An electronic circuit for starting a single phase induction motor operating from a source of alternating current, the motor having a cage type rotor, a coiled stator having at least a main winding and a starting winding, and a permanent capacitor connected in series with the starting winding. The permanent capacitor and the starting winding are connected in parallel to the alternating current source and the main winding in series. A TRIAC has a first terminal connected to one side of the alternating current source and a second terminal connected to the starting winding and to the permanent capacitor. A TRIAC trigger circuit is connected between the TRIAC second terminal and its GATE terminal and a bilateral swtich is connected to the TRIAC GATE terminal. A timer circuit is connected to the bilateral switch and to the alternating current source, the timer circuit defining the time elapsed from the motor powering up till the interruption of the TRIAC conduction by turning on the bilateral switch, the TRIAC trigger circuit repeatedly triggering the TRIAC to a turn on condition at the beginning of each current half-cycle while the bilateral switch remains cut off by the timer circuit.
80 Citations
12 Claims
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1. An electronic circuit for starting a single phase induction motor of the type having a cage type rotor and a stator with at least a main winding and a starting winding for operating on alternating current supplied from a source comprising,
a permanent capacitor connected in series with the starting winding; - and
first and second circuit terminals for connecting the main winding in series with the alternating current source, said permanent capacitor and the starting winding being connected in parallel to said circuit terminals, a TRIAC having a first terminal connected to the first circuit terminal of the alternating current source, a second terminal connected to the starting winding and to the permanent capacitor, and a GATE terminal; a TRIAC trigger circuit formed by a first capacitor having one terminal connected to the second terminal of the TRIAC and another terminal connected to the GATE terminal of TRIAC through a first resistor; a bilateral switch connected between the GATE terminal and the first terminal of the TRIAC, said switch having control terminals; and a timer circuit connected to the control terminals of the bilateral switch and to the first and second circuit terminals of the alternating current source, said timer circuit defining the time elapsed from the motor powering up until the interruption of the TRIAC conduction caused by turning on the bilateral switch, the TRIAC trigger circuit repeatedly triggering the TRIAC to a turn on condition at the beginning of each current half-cycle while the bilateral switch remains cut off by the timer circuit. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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Specification