Elevator brake controller for modulating DC voltage
First Claim
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1. A brake controller, comprising:
- a DC link for supplying power, said DC link including a positive DC link rail and a negative DC link rail;
output terminals for coupling a magnetizing coil of an electromagnetic brake to the brake controller; and
a current path established between said DC link and said output terminals for conducting DC link power to said magnetizing coil;
wherein the brake controller comprises two solid-state switches fitted into the current path,wherein said solid-state switches are configured to adjust output terminal voltage by modulating the DC link voltage, andwherein the brake controller comprises a control circuit coupled to control poles of the solid-state switches and configured to apply a modulation alternately to the solid-state switches.
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Abstract
A brake controller including a DC link for supplying power, the DC link including a positive DC link rail and a negative DC link rail; output terminals for connecting to a magnetizing coil of an electromagnetic brake; a current path established between the DC link and the output terminals for conducting DC link power to the magnetizing coil; and two solid-state switches fitted into the current to adjust output terminal voltage by modulating the DC link voltage.
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Citations
17 Claims
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1. A brake controller, comprising:
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a DC link for supplying power, said DC link including a positive DC link rail and a negative DC link rail; output terminals for coupling a magnetizing coil of an electromagnetic brake to the brake controller; and a current path established between said DC link and said output terminals for conducting DC link power to said magnetizing coil; wherein the brake controller comprises two solid-state switches fitted into the current path, wherein said solid-state switches are configured to adjust output terminal voltage by modulating the DC link voltage, and wherein the brake controller comprises a control circuit coupled to control poles of the solid-state switches and configured to apply a modulation alternately to the solid-state switches. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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Specification