Elevator brake control system
First Claim
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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Accused Products
Abstract
An elevator brake control system (10) is described, 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 hoistway, 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 (10) 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 sub-system of the elevator, such as to bring the elevator brake into its engaged condition in response to detection of such failure; wherein each of the first safety device (T1) and the second safety device (T2) comprises a power semiconductor switching device.
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Citations
18 Claims
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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;
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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Specification