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Protection circuit for electrical appliance
| Details |
Inventors: Nakamura, Ikuro;
Assignee:
Primary Examiner: DeBoer; Todd E.
Assistant Examiner:
Attorney, Agent or Firm: Kojima; Moonray
A protection device for an electric appliance comprising a differential transformer comprising a magnetic core disposed around a pair of wires leading to the appliance from the source and a sensing wire thereon; a solenoid driven switch for cutting off the source in response to a leakage current in the wires; an SCR which is normally non-conducting for connecting the solenoid to the source in the conducting state so as to cause the switch to be in a cut-off state; a voltage regulator for supplying suitable regulated voltage to an amplifier and a latched-trigger circuit; an amplifier connected to the sensing wires for providing a signal to the latched-trigger circuit; and a latched-trigger circuit for taking the signal from the amplifier and in response thereto provide a trigger signal to cause the SCR to be in a conducting state so as to operate the solenoid and cut-off switch. Advantageously, a Zener diode is provided at one input terminal of the amplifier to provide a threshold level for the differential current detected by the sensing winding to operate the amplifier. By simply adjusting the value of the Zener diode, the threshold level can be simply adjusted. Advantageously, the invention is simple, inexpensive, and reliable. |
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DETAILED DESCRIPTION Accordingly, an object of the invention is to simplify electrical protection circuits, reduce expense of manufacture, and extend usage of such protection circuits without requiring changes in appliance, The foregoing and other objects, features and advantages of the invention are attained in an electrical protection circuit which utilizes a differential transformer comprising a toroidal core having a hole therein through which a pair of wires connecting the appliance to the source are passed and a sensing winding on the core for detecting differential current between the two wires; a solenoid driving switch for cutting off the wires to the appliance from the source when a fault occurs in the appliance as indicated by differential current in the sensing winding; an SCR which is normally non-operated but which is operated when the fault is detected; a voltage regulator to provide proper regulated voltage to an amplifier and a latch-trigger circuit; an amplifier connected to the sensing winding to provide a control signal to the latchtrigger circuit; a latch-trigger circuit for taking the control signal from the amplifier and in response thereto provide a trigger signal to the SCR to cause it to become conductive and thereby energize the solenoid and cause the wires to the appliance to be cut-off from the source.
A Zener diode is connected to the amplifier to provide a threshold level above which a signal detected by the sensing wire of the differential transformer will be applied to the amplifier for amplification.
Advantageously, the Zener diode arrangement can be simply adjusted to adjust the threshold level and thereby prevent false faults from triggern the SCR Also, advantageously, the entire arrangement of the invention is simple, can be produced from simple off-the-shelf components, and is inexpensive, and reliable.
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