Electrical transmission or interconnection systems – Personnel safety or limit control features – Interlock
Patent
1979-03-20
1981-07-14
Zazworsky, John
Electrical transmission or interconnection systems
Personnel safety or limit control features
Interlock
307264, 307363, 307546, 330254, H03K 5153
Patent
active
042789010
ABSTRACT:
An input signal could include a pulsive noise such as an ignition noise in superposition on a continuous noise such as a white noise. Such input signal is commonly applied to the respective base electrodes of paired transistors of the same conductivity type connected in a differential amplifier fashion. The amplified signal is then applied to a rectifying circuit, where the signal is full-wave rectified, and the output of the rectifying circuit is detected by a detector. The detected output is then applied to the base electrode of a first transistor. A second transistor is provided such that a current mirror circuit is formed between the collector electrode of the second transistor and the collector electrode of the first transistor. A diode circuit is connected between the current mirror circuit and the collector electrode of the second transistor in the forward direction. The diode circuit comprises a parallel connection of two diode-series connections, the junction of one diode-series connection being connected to the base electrode of one of the paired transistors and the junction of the other diode-series connection being connected to the base electrode of the other transistor of the paired transistors. The output of the rectifying circuit is further applied to a pulsive noise detecting circuit, which is adapted to level detect the noise at a predetermined level higher than the level of the continuous noise, thereby to detect presence or absence of a pulsive noise.
REFERENCES:
patent: 3005048 (1961-10-01), Goodrich
patent: 4124819 (1978-11-01), Hansen
patent: 4197505 (1980-04-01), Nishisima et al.
Sanyo Electric Co,. Ltd.
Tokyo Sanyo Electric Co. Ltd.
Zazworsky John
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