Electromagnetic contactor and a method of controlling the same
First Claim
1. An electromagnetic contactor, to which an input voltage is loaded and having a coil, comprising:
- detector means for detecting a peak voltage value of said input voltage and for detecting an average value of said input voltage, wherein said input voltage is one of a full wave rectified alternating current and a DC voltage,switching means, responsive to an operating signal, for controlling operation of said electromagnetic contactor; and
a controller for generating said operating signal and for stabilizing input power supplied to said coil at a constant level by controlling a pulse width of said operating signal based on said peak voltage value and said average value of said input voltage detected by said detector means.
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Accused Products
Abstract
An electromagnetic contactor to which voltage generated through full wave rectification of an alternating current or DC voltage is loaded. The device provides control for a closing operation with a large pulse width according to a set-up frequency and control for maintaining the closed state of the electromagnetic contactor with a small pulse width for executing ON/OFF control. The device comprises a detector for detecting a peak voltage value of the voltage subjected to full wave rectification and an average value or an effective value thereof and a controller for stabilizing the input at a constant level by controlling a pulse width of a frequency set up based on a voltage value detected by the detector.
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Citations
56 Claims
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1. An electromagnetic contactor, to which an input voltage is loaded and having a coil, comprising:
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detector means for detecting a peak voltage value of said input voltage and for detecting an average value of said input voltage, wherein said input voltage is one of a full wave rectified alternating current and a DC voltage, switching means, responsive to an operating signal, for controlling operation of said electromagnetic contactor; and a controller for generating said operating signal and for stabilizing input power supplied to said coil at a constant level by controlling a pulse width of said operating signal based on said peak voltage value and said average value of said input voltage detected by said detector means. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A method of controlling an electromagnetic contactor, to which an input voltage is loaded, comprising the steps of:
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detecting a peak voltage value of said input voltage, said input voltage being one of a full wave rectification of an alternating current and a DC voltage; generating an operating signal based upon said peak voltage value; stabilizing input power, supplied to said electromagnetic contactor, at a constant level in accordance with said operating signal; wherein a closing operation is performed when said operating signal has a first pulse width, and wherein a closed state of said electromagnetic contactor is maintained when said operating signal has a second pulse width; and controlling ON time of said electromagnetic contactor based on said peak voltage value. - View Dependent Claims (17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30)
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31. A method of controlling an electromagnetic contactor to which an input voltage is loaded, comprising the steps of:
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detecting a peak voltage value of said input voltage; generating an operating signal in accordance with said peak voltage value, for closing said electromagnetic contactor, having a first pulse width; reducing said first pulse width of said operating signal to a second pulse width for maintaining said closed state of said electromagnetic contactor to perform ON/OFF control of said electromagnetic contactor, and setting switching elements, connected in series to an operational coil, to an OFF state when said input voltage is not sufficient to drive said electromagnetic contactor. - View Dependent Claims (32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45)
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46. A method of controlling an electromagnetic contactor having a movable section having a movable iron core, a fixed iron core, and a timer, said electromagnetic contactor being operable in at least a closing state and a maintaining state for ON/OFF control, said method comprising the steps of:
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generating an input voltage through one of full wave rectification of an alternating current and a DC voltage, controlling said closing state with an operating signal, determined in accordance with a peak voltage value of said input voltage and supplied to switching means, having a first pulse width; controlling said maintaining state with said operating signal having a second pulse width, which is smaller than said first pulse width, for maintaining said closing state of said electromagnetic contactor, generating control pulses for obtaining said closing state for the first time when a peak value of said input voltage exceeds a preset minimum operation reference voltage value to start a closing operation, generating an auxiliary closing signal for flowing a current in an operation coil in said electromagnetic contactor during detection of said peak value of said input voltage, and controlling said operation coil in said electromagnetic contactor according to one of a logical product of said control pulses, said auxiliary closing signal and a switching command. - View Dependent Claims (47, 48, 49, 50, 51, 52, 53, 54, 55, 56)
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Specification