Boost circuit of elevator emergency rescue device

Abstract

The invention discloses a booster circuit of an elevator emergency rescue device. On the basis of the existing booster circuit, a transformer winding adjusting circuit is arranged to shorten the access length of a secondary winding of a booster transformer after receiving a control instruction so as to reduce the output voltage of the booster circuit; and a divider resistor short circuit is arranged to be used for short circuit of at least one divider resistor in the output voltage sampling feedback circuit after a control instruction is received, so that the voltage division proportion corresponding to the shortened secondary winding of the boosting transformer is counteracted, and it is ensured that the output efficiency of the boosting circuit is basically kept unchanged. Compared with the prior art, the booster circuit of the elevator emergency rescue device can change the output voltage in a large range under the condition that the output efficiency of the whole booster circuit is not affected.

Description

technical field [0001] The invention relates to an elevator emergency rescue device (ARD), in particular to a booster circuit of the elevator emergency rescue device. Background technique [0002] With the progress of society, houses in cities tend to be built higher and higher, and elevators are increasingly used in high-rise buildings for home or office. [0003] When a running elevator suddenly encounters a power supply system failure (such as a power outage, line failure, etc.), its car will be stuck in the well, often stuck between floors. The traditional solution is to wait for professionals to arrive at the scene for rescue. However, waiting for rescue in a narrow elevator car for a long time will have adverse effects on the body and mind of the trapped people, and improper self-rescue behaviors by the trapped people due to panic will also increase the possibility of accidents. [0004] As an effective means to ensure the safety of passengers when the elevator power ...

AI Technical Summary

Problems solved by technology

In this boost circuit, the output voltage is determined by the duty cycle of the PWM signal, but since the winding of the step-up transformer T1 is fixed, changing the duty cycle of the PWM signal can change the output voltage within a certain range, but the adjustment range is limited. If the adjustment range is too large, the efficiency of the entire boost circuit will be greatly reduced.

Images