Precision control of relay operate and release times

• US 3,938,009 A
• Filed: 09/27/1974
• Issued: 02/10/1976
• Est. Priority Date: 09/27/1974
• Status: Expired due to Term

• Current Assignee: Microtel Limited-Microtel Limitee
• Original Assignee: GTE Automatic Electric Incorporated
• Inventors: Gauthier, John A.
• Primary Examiner(s): Envall, Jr., R. N.
• Application Number:
  US05/510,085
• Time in Patent Office: 501 Days
• Field of Search: 317/141 S, 317/157, 317/148.5 R, 317/148.5 B, 317/123
• US Class Current: 361/160
• CPC Class Codes: H03K 5/05 by the use of clock signals or other time reference signals
• CPC Class Codes: H03K 5/135 by the use of time reference signals, e.g. clock signals

Abstract

A shift register is provided with two inputs and two outputs. One input is from a free running clock and a second input is provided for relay operate and release signals. The two outputs are coupled to a NAND gate to provide a longer relay operate than release time. The two outputs are coupled to a NOR gate for a longer relay release time than operate time. Either gate output is coupled to a relay driver to operate the relay.

Claims

1. A system for varied accurate relay operate and release times including, a relay, a free running clock producing clock pulses, and relay operate and release signals, said system comprising:

a single shift register device having one input coupled to said clock pulses and a second input coupled to said relay operate and release signals;

a single output gate means coupled to said shift register device; and

relay driver means coupled to said output gate means and to said relay.

2. A system of claim 1 wherein said output gate means comprises:

Nand gate means;

whereby said relay has a longer operate than release time.

3. A system of claim 1 wherein said output gate means comprises:

Nor gate means;

whereby said relay has a longer release than operate time.