Apparatus and method for holding brake control
AssigneeOtis Elevator Company
InventorsHeping Qiu, Hongliang Tian, Baoxiang Cen
Life of this patent
Estimating the term…
Abstract
A device for brake control includes a first branch circuit and a second branch circuit connected in parallel. The first branch circuit and the second branch circuit include a first brake coil and a first switching element connected in series and a second brake coil and a second switching element connected in series, respectively. The device further includes a third switching element connected between a power supply and the first branch circuit and the second branch circuit, which is configured to connect or disconnect the power supply with the first branch circuit and the second branch circuit in response to the state of an elevator safety chain.
Claims13
A device for brake control, comprising:
- a first branch circuit, comprising a first brake coil and a first switching element connected in series;
- a second branch circuit connected in parallel with the first branch circuit, comprising a second brake coil and a second switching element connected in series;
- and
- a third switching element connected between a power supply and the first branch circuit and the second branch circuit, the third switching element being configured to connect or disconnect the power supply with the first branch circuit and the second branch circuit in response to a state of an elevator safety chain,
- wherein when the power supply is connected with the first branch circuit and the second branch circuit, the supply of power from the power supply to the first brake coil and the supply of power from the power supply to the second brake coil are controlled by the first switching element and the second switching element, respectively,
- wherein control signals for the first switching element and the second switching element comprise a pulse width modulation signal.
A method for brake control, comprising the following steps:
- A. closing a third switching element connected between a power supply and a first branch circuit and a second branch circuit in response to an event of an elevator safety chain entering a closed state, wherein the first branch circuit comprises a brake coil and a first switching element connected in series, and the second branch circuit is connected in parallel with the first branch circuit and comprises a second brake coil and a second switching element connected in series;
- and
- B. controlling the supply of power from the power supply to the first brake coil and the second brake coil by the first switching element and the second switching element respectively, wherein control signals for the first switching element and the second switching element comprise a pulse width modulation signal.
Dependencies are inferred from the claim text.