Elevator rescue operation control system including selective transformer winding energization
First Claim
1. A power supply for an elevator drive, comprisinga voltage input,a comparator for comparing the input voltage with a predetermined threshold,a transformer having a single tapped primary winding and a secondary winding,the secondary winding being connected to the elevator drive;
- wherein, when the input voltage exceeds the predetermined threshold input, an output of the comparator is configured to cause power to flow between the tapping of the primary winding and a first end of the primary winding, andwherein, when the input voltage is below the predetermined threshold, the output of the comparator is configured to cause power to flow between the tapping of the primary winding and a second end of the primary winding.
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Accused Products
Abstract
A power supply for an elevator drive includes a voltage input, a comparator for comparing the input voltage with a predetermined threshold, a transformer having a primary winding and a secondary winding connected to the elevator drive. The transformer has a single tapped primary winding. When the input voltage exceeds the predetermined threshold input, the comparator output causes power to be supplied to the primary winding via one of an end of the winding or the tapping of the winding, and when the input voltage is below the predetermined threshold, input power is supplied to the primary winding via the other of the end of the primary winding and the tapping of the winding.
35 Citations
5 Claims
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1. A power supply for an elevator drive, comprising
a voltage input, a comparator for comparing the input voltage with a predetermined threshold, a transformer having a single tapped primary winding and a secondary winding, the secondary winding being connected to the elevator drive; -
wherein, when the input voltage exceeds the predetermined threshold input, an output of the comparator is configured to cause power to flow between the tapping of the primary winding and a first end of the primary winding, and wherein, when the input voltage is below the predetermined threshold, the output of the comparator is configured to cause power to flow between the tapping of the primary winding and a second end of the primary winding. - View Dependent Claims (2, 3, 4, 5)
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Specification