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Elevator brake control system

  • US 10,442,660 B2
  • Filed: 09/12/2014
  • Issued: 10/15/2019
  • Est. Priority Date: 09/12/2014
  • Status: Active Grant
First Claim
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1. Elevator brake control system, in particular for controlling an elevator brake in a machine room-less elevator, the elevator including a drive machine drivingly coupled to an elevator car for moving the elevator car between a plurality of landings in a hoist-way, and an elevator brake having at least an engaged condition for holding the elevator car at a fixed position in the hoistway, and a released condition for allowing the elevator car to move along the hoistway;

  • the elevator brake control system comprising a first safety device (T1) and a second safety device (T2), each of the first safety device (T1) and the second safety device (T2) responsive to detection of a failure in any subsystem of the elevator, such as to bring the elevator brake into its engaged condition in response to detection of such failure;

    a brake control circuit having a first brake control terminal connected to the gate terminal of the first power semiconductor switching device (T1) and having a second brake control terminal connected to the gate terminal of the second power semiconductor switching device (T2);

    wherein each of the first safety device (T1) and the second safety device (T2) comprises a power semiconductor switching device;

    wherein the brake control circuit is configured to supply a first control voltage (SBC-PWM-1) to the first brake control terminal and to supply of a second control voltage (SBC-2) to the second brake control terminal independent of the first control voltage (SBC-PWM-1);

    wherein the first control signal (SBC-PWM-1) includes a base component and a modulation component applied to said base component; and

    wherein the second control signal (SBC-PWM-2) includes only a base component.

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