Electricity: power supply or regulation systems – Input level responsive
Patent
1998-07-30
2000-03-14
Wong, Peter S.
Electricity: power supply or regulation systems
Input level responsive
307 66, G05F 112
Patent
active
060377615
ABSTRACT:
A voltage supply circuit for a CPU of a programmable controller is provided, the CPU receiving via the voltage supply circuit at least two supply voltages obtained from an input voltage. The circuit operates in a manner such that when the input voltage is increased from an open-circuit potential, a first supply voltage is received by the CPU as soon as the input voltage exceeds an upper input voltage threshold value. The second supply voltage is received by the CPU when the first supply voltage exceeds a primary supply voltage threshold value. When the input voltage decreases from a value (where both supply voltages are received by the CPU), the second supply voltage is no longer received by the CPU when the input voltage and drops below a lower input voltage threshold value, and also the first supply voltage is no longer received by the CPU as soon as the second supply voltage drops below a secondary supply voltage threshold value.
REFERENCES:
patent: 5739596 (1998-04-01), Takizawa et al.
Amphein et al., Neue Kompakterate runden SPS-Spektrum ab, Engineering & Automation 13, 1991, H.2, S. 4-7 * no month ava.
Patel Rajnikant B.
Siemens Aktiengesellschaft
Wong Peter S.
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