US Patent No. 10,189,675

FULLY ADJUSTABLE BRAKE CONTROLLER WITHOUT NEED OF DC-LINK


Patent No. 10,189,675
Issue Date January 29, 2019
Title Fully Adjustable Brake Controller Without Need Of Dc-link
Inventorship Henri Wenlin, Helsinki (FI)
Tuukka Korhonen, Tuusula (FI)
Lauri Stolt, Helsinki (FI)
Ari Pikivirta, Tervakoski (FI)
Arto Nakari, Hyvinkaa (FI)
Assignee Kone Corporation, Helsinki (FI)

Claim of US Patent No. 10,189,675

1. An adjustable brake controller of an elevator brake, comprising:a DC bus;
first terminals for connecting the adjustable brake controller to a first magnetizing coil;
second terminals for connecting the adjustable brake controller to a second magnetizing coil;
a first controllable power switch coupled between the first terminals and the DC bus, the first controllable power switch being configured to supply electric power from the DC bus to the first magnetic coil responsive to a first control signal;
a second controllable power switch coupled between the second terminals and the DC bus, the second controllable power switch being configured to supply electric power from the DC bus to the second magnetizing coil responsive to a second control signal; and
a controller configured to generate the first and the second control signals for controlling the first and second controllable power switches, respectively, the controller having
a brake open mode for opening a brake, wherein the first and second control signals have a same specified pattern, and
a brake holding mode for holding the brake open, wherein the first and second control signals have a different specified pattern.