Chattering preventive circuit
AssigneeNippon Electric Co., Ltd.
InventorYukuo Kodama
Life of this patent
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Abstract
A chattering prevention circuit includes a counter, which upon receiving an input signal including a chattering signal such as from a switch contact, begins to count a clock signal. When the count reaches a predetermined value, a gate signal is generated which, in turn, is employed to gate the input signal. The input signal is delayed by a time corresponding to the period during which the chattering phenomenon remains in effect following the closing of the contact, thereby to prevent chattering.
Claims5
A chattering prevention circuit comprising a circuit for generating a switching signal including a chattering signal, a source of clock pulses, a counter circuit connected to said source of clock pulses and coupled with said switching signal generating circuit, said counter circuit starting to count said clock pulses in response to said switching signal and continuing to count said clock pulses at least for a period of time during which said chattering signal is included in said switching signal, means connected to said counter circuit for generating a gate signal after said period of time, a gate circuit connected to the output of said gate signal generating means, an output terminal connected to said gate circuit, said gate circuit passing said switching signal during the presence of said gate signal to said output terminal, whereby the switching signal from which said chattering signal is removed is obtained at said output terminal.
Dependencies are inferred from the claim text.