Patent ID: 8820484

Claim:
A control circuit of elevator braking systems, comprising: a contracting brake signal generating circuit, wherein a door lock relay DJ and a contracting brake contactor ZJ for issuing contracting brake/releasing brake commands are series connected; a contracting brake signal processing circuit for receiving, contracting brake/releasing brake command signals and issuing the same to a braking controller; and an isolation control switch CK which is jointly connected in the contracting brake signal generating circuit and the contracting brake signal processing circuit, for controlling the contracting brake signal processing circuit to convert between high and low level in response to command signals from the contracting brake signal generating circuit; wherein the contracting brake signal processing circuit is a level conversion circuit, with one end thereof being connected to a DC power supply, an immediate part thereof being series connected with a current limiting resistance and the other end thereof being connected to a grounding line G; a control signal output line C for connecting the braking controller is connected at one node of the circuit.