US 12,098,056 B2 · Elevator

Abstract

An elevator may include an elevator motor driving at least one elevator car in a hoisting path, which elevator motor is driven via a frequency converter controlled by a control device of the elevator. The frequency converter includes a rectifier bridge and an inverter bridge and a DC link in-between. The elevator further includes at least one elevator brake acting on a brake element rotating with the rotor of the elevator motor, which elevator brake is driven via a brake drive which is connected to the DC link of the frequency converter an comprises a DC/DC converter having its primary side connected to the DC link and its secondary side connected to a brake circuit comprising at least one brake coil of the elevator brake and at least one rectifying element. In the primary side of the DC/DC converter, a first semiconductor switch is connected which is controlled by the control device of the elevator. In the brake circuit a second semiconductor switch is connected which is also controlled by the control device of the elevator, whereby an earth fault indication circuit is connected between the brake circuit and earth. The earth fault indication circuit includes an transmitting part of an opto-coupler, which opto-coupler has its sensor part connected to an earth fault transmission circuit connected to the control device of the elevator. The control device is configured to control the first and/or second semiconductor switch depending on the signal of the earth fault transmission circuit.

Claims20

Dependent claims

A brake drive of an elevator the brake drive comprising:

a galvanically separating link component having a primary side and a secondary side, the primary side connected to a DC link between a rectifier bridge and an inverter bridge;
a brake circuit connected to the secondary side of the galvanically separating link component, the brake circuit including at least one brake coil of an elevator brake and at least one rectifying element;
a first semiconductor switch connected to the primary side of the galvanically separating link component;
a second semiconductor switch;
an earth fault indication circuit connected between the brake circuit and earth, the earth fault indication circuit including a transmitting part and a receiving part;
an earth fault transmission circuit configured to generate an earth fault signal in response to the earth fault indication circuit indicating an earth fault in the brake circuit;
and
a control device configured to determine if the earth fault is present in brake circuit by first switching on at least the first semiconductor switch to supply power to the secondary side of the galvanically separating link component, second switching off the second semiconductor switch for at least a set period of time, and determining whether the earth fault is present based on whether the earth fault signal of the earth fault transmission circuit is received from the earth fault transmission circuit.

5 more elements

A method for operating a brake drive of an elevator, the brake drive including a galvanically separating link component having a primary side and a secondary side, the primary side connected to a DC link between a rectifier bridge and an inverter bridge, a brake circuit connected to the secondary side of the galvanically separating link component, the brake circuit including at least one brake coil of an elevator brake and at least one rectifying element, a first semiconductor switch connected to the primary side of the galvanically separating link component;

a second semiconductor switch, an earth fault indication circuit connected between the brake circuit and earth, the earth fault indication circuit including a transmitting part and a receiving part, an earth fault transmission circuit and a control device configured to control one or more of the first semiconductor switch and the second semiconductor switch, the method comprising:
first switching on at least the first semiconductor switch to supply power to the secondary side of the galvanically separating link component;
second switching off the second semiconductor switch for at least a set period of time;
determining whether an earth fault is present in the brake circuit based on whether an earth fault signal is received from the earth fault transmission circuit;
and
selectively driving an elevator car to a next landing after receiving the earth fault signal from the earth fault transmission circuit.

3 more elements

Dependencies are inferred from the claim text.

Elevator

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Elevator

Life of this patent

Abstract

Claims20