Switching device with dynamic hysteresis

Details Switching device with dynamic hysteresis Switching device with dynamic hysteresis

1986-11-25

1988-04-26

Zazworsky, John

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

307451, 307491, 307572, H03K 1716, H03K 17687, H03K 19003, H03K 19094

Patent

active

047407174

ABSTRACT:
A switching device (22) responsive to an input voltage V.sub.A is powered by low and high internal supply voltages V.sub.L and V.sub.H. The device changes state as V.sub.A -V.sub.L passes a threshold voltage V.sub.T. After the device makes a desired change of state in response to rising V.sub.A, a hysteresis circuit (24) temporarily decreases V.sub.T below that which would otherwise be present. Likewise, after the device makes a desired change of state in the opposite direction when V.sub.A is falling, the hysteresis circuit temporarily decreases V.sub.T. In both cases, V.sub.T later automatically returns to its original value. This dynamic hysteresis prevents spikes in V.sub.L and V.sub.H from causing undesired changes in state.

REFERENCES:
patent: 4507570 (1985-03-01), Mahabadi et al.
patent: 4532439 (1985-07-01), Koike
patent: 4609834 (1986-09-01), Gal

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