Electrical transmission or interconnection systems – Personnel safety or limit control features – Interlock
Patent
1985-12-09
1987-10-20
Zazworsky, John
Electrical transmission or interconnection systems
Personnel safety or limit control features
Interlock
307106, 307363, H03K 5153
Patent
active
047016396
ABSTRACT:
A threshold detector circuit and method for providing an output signal indicative of the relative magnitude of an input signal and a predetermined threshold value. The circuit, which is powered by the input signal and does not require a separate power source, includes a reference stage which switches from one state to another state when the input to the reference exceeds a predetermined reference voltage. The reference voltage is equal to the sum of two voltages having positive and negative temperature coefficients, respectively so that the total coefficient is small. A pair of transistors operating at different emitter current densities provide a difference in base-to-emitter voltages used to derive the first voltage and an absolute base-to-emitter voltage is used for the second voltage. An input stage is included which has a transistor for coupling the detector input to the reference stage input. The input transistor is saturated when the detector input approaches the threshold voltage so that the overall temperature coefficient remains low. An output stage produces an output signal which changes when the input signal causes the reference stage to change states.
REFERENCES:
patent: 4385243 (1983-05-01), Suzuki
patent: 4525638 (1985-06-01), Gray
F. C. Easter, "Voltage Monitor Circuit", RCA Technical Notes No. 1240, 2 sheets, 5-23-80.
National Semiconductor Corporation
Woodward Gail W.
Zazworsky John
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