The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Mar. 14, 2000
Filed:
Jul. 30, 1998
Gerald Hirmer, Mantel, DE;
Siemens Aktiengesellschaft, Munich, DE;
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.