US 8,274,253 B2Granted

Control circuit for single-phase AC motor for dryer

AssigneeZhongshan Broad-Ocean Motor Manufacturing Co., Ltd.

InventorYong Zhao

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Abstract

A single-phase AC motor control circuit for a dryer, including a starting control unit, a first drive circuit, a bidirectional triode thyristor BCR1, a second drive circuit, and a bidirectional triode thyristor BCR2. The bidirectional triode thyristor BCR1 is serially connected to a motor starting winding, and a starting capacitor, and then to a utility power AC input. The starting control unit is connected to a control end of the bidirectional triode thyristor BCR1 via the first drive circuit. The bidirectional triode thyristor BCR2 is serially connected to an electrically heated strip, and then to the utility power AC input. The starting control unit is connected to a control end of the bidirectional triode thyristor BCR2 via the second drive circuit. The first drive circuit is interlocked with the second drive circuit.

Claims4

Dependent claims

A control circuit for a single-phase AC motor of a dryer, comprising a starting control unit;

a first drive circuit;
a bidirectional triode thyristor BCR1;
a second drive circuit;
and
a bidirectional triode thyristor BCR2;
wherein
said bidirectional triode thyristor BCR1 is serially connected to a motor starting winding, and a starting capacitor, and then to a utility power AC input;
said starting control unit is connected to a control end of said bidirectional triode thyristor BCR1 via said first drive circuit;
said bidirectional triode thyristor BCR2 is serially connected to an electrically heated strip, and then to said utility power AC input;
said starting control unit is connected to a control end of said bidirectional triode thyristor BCR2 via said second drive circuit;
and
said first drive circuit is interlocked with said second drive circuit, so that as said bidirectional triode thyristor BCR1 is on, said bidirectional triode thyristor BCR2 is off, and as said bidirectional triode thyristor BCR1 is off, said bidirectional triode thyristor BCR2 is on.

9 more elements

Dependencies are inferred from the claim text.

Facts

Application: 13/206,502Filed 9 Aug 2011 · continuation
Priority: CN 2009 2 005631511 May 2009
Published: US 2011/0298413 A18 Dec 2011
Granted: 25 Sep 2012
Term ends: Not estimatedThe source records don’t support an estimate.

Classification4 codes

H02P 1/426
For starting an individual single-phase induction motor: by using a specially adapted frequency converter
H02P 1/44
For starting an individual single-phase induction motor: by phase-splitting with a capacitor
H02P 25/04
Characterised by the kind of motor: single phase motors, e.g. capacitor motors
H02P
Control or regulation of electric motors, electric generators or dynamo-electric converters