ELEVATOR ELECTRICITY FEEDBACK DEVICE, ELEVATOR ELECTRICITY FEEDBACK METHOD AND ELEVATOR THEREOF

• US 20140076666A1
• Filed: 03/18/2013
• Published: 03/20/2014
• Est. Priority Date: 09/20/2012
• Status: Active Grant

• Current Assignee: Delta Electronics Limited (Delta Electronics Incorporated)
• Original Assignee: Delta Electro-Optics Limited (Delta Electronics Incorporated)
• Inventors: YEN, Liangyi, SHAO, Shifeng
• Granted Patent: US 9,327,939 B2
• Time in Patent Office: Days
• US Class Current: 187/247
• CPC Class Codes: B66B 1/302 for energy saving
• CPC Class Codes: H02P 3/18 for stopping or slowing an ac motor

Abstract

An elevator electricity feedback device, an elevator electricity feedback method and an elevator thereof are disclosed. The elevator electricity feedback device comprises a sampling unit, a transmitting unit, and a central processing unit. The sampling unit is electrically connected with an energy supply network of the elevator and the CPU, the transmitting unit is electrically connected with a motor driver of the elevator and electrically connected with the energy supply network through an AC resistor; and the CPU is electrically connected with the transmitting unit. The advantages of the present invention are as follows. The transmitting unit is electrically connected with the motor driver of the elevator to feed back an energy of the motor driver to the energy supply network when the motor driver is in an energy generating state so that an effect of conserving energy is achieved.

Claims

1. An elevator electricity feedback device comprising a sampling unit, a transmitting unit and a central processing unit (CPU), wherein

the sampling unit electrically connected to an energy supply network of an elevator and the CPU, samples alternating current (AC) signals of the energy supply network and inputs the sampled AC signals to the CPU;

the transmitting unit is electrically connected to a motor driver of the elevator, and through an AC resistor, electrically connected to the energy supply network, wherein when the motor driver is in an energy consuming state, the transmitting unit transmits an energy provided by the energy supply network to the motor driver, and when the motor driver is in an energy generating state, the transmitting unit feeds back an energy produced by the motor driver to the energy supply network; and

the CPU electrically connected with the transmitting unit, inputs the AC signals obtained by the sampling unit to the transmitting unit.

2. The elevator electricity feedback device elevator of claim 1, wherein the transmitting unit further comprises a detector, a pulse width modulation (PWM) unit and a switch, wherein

the switch is electrically connected with the motor driver, and through the AC resistor, electrically connected with the energy supply network, and when the motor driver is in the energy consuming state, the switch converts a AC current provided by the energy supply network into DC current which is transmitted to the motor driver, and when the motor driver is in the energy generating state, the switch inverts a DC current produced by the motor drive into AC current which is transmitted to the energy supply network;

the detector electrically connected with the motor driver and the CPU, detects an operating state of the motor driver and inputs the detected operating state of the motor driver to the CPU;

the PWM unit electrically connected with the CPU and the switch, obtains the AC signals of the energy supply network, and when the motor driver is energy generating state, the PWM unit synchronizes the current transmitted to the energy supply network by the switch and existing current of the energy supply network.

3. The elevator electricity feedback device of claim 2, wherein the detector further comprises a capacitor and a threshold value judgment unit, the capacitor is electrically coupled with the motor drive, and the threshold value judgment unit is electrically coupled with the capacitor and the CPU, and the detector is utilized for comparing a voltage between two ends of the capacitor with a voltage threshold value, and transmitting a control signal to the CPU according to a comparing result.

4. The elevator electricity feedback device of claim 1, wherein the elevator electricity feedback device further comprises a communication port which is electrically connected with the CPU and utilized for reporting operating parameters of the elevator electricity feedback device to a bus.

5. The elevator electricity feedback device of claim 4, wherein the operation parameters comprise operating times, total energy of the energy feedback, and feedback frequency.

6. The elevator electricity feedback device of claim 1, wherein the electricity feedback device further comprises an external multifunction terminal which is electrically connected with the CPU, and utilized for controlling enablement and disablement of the electricity feedback device and obtaining a malfunction code of the electricity feedback device.

7. The elevator electricity feedback device of claim 1, wherein the sampling unit comprises a voltage detector and a current detector, the voltage detector is utilized for sampling AC voltage signals of the energy supply network and the current detector is utilized for sampling AC signals of the energy supply network.

8. The elevator electricity feedback device of claim 1, wherein the energy generating state of the motor driver corresponds to either an ascending no-load condition or a descending full-load condition of the elevator.

9. An elevator electricity feedback method applied for the elevator electricity feedback device of claim 1, and comprising steps of:

sampling the AC signals of the energy supply network by the sampling unit;

detecting the operating state of the motor driver by the transmitting unit, and transmitting the operating state of the motor driver to the CPU; and

when the motor driver is in the energy generating state, the CPU controls the transmitting unit to feed back energy produced by the motor driver to the energy supply network, and a feedback current is controlled by a sampling signal of the sampling unit to ensure that the feedback current and the existing current of the energy supply network are synchronous.

10. The elevator electricity feedback method of claim 9, wherein the transmitting unit further comprises a detector, a pulse width modulation (PWM) unit and a switch, and

the step of detecting the operating state of the motor driver by the transmitting unit further comprises adopting the operating state of the motor driver detected by the detector, and transmitting the detected operating state of the motor driver to the CPU;

and

the control method of the feedback current controlled by the signals sampled by the sampling unit comprises obtaining the AC signals from the CPU by the PWM unit, and controlling the AC current transmitted from the switch to the energy supply network to synchronize with the existing current of the energy supply network, according to the AC signals.

11. The elevator electricity feedback method of claim 10, wherein the detector further comprises a capacitor and a threshold value judgment unit, the capacitor is electrically coupled with the motor driver of the elevator, and the threshold value judgment unit is electrically coupled with the capacitor, and

the operating state of the motor driver of the elevator detected by the detector further comprises adopting the threshold value judgment unit to compare a voltage between two ends of the capacitor with a voltage threshold value, and transmitting an operating state signal of the motor driver to the CPU, according to a comparing result.

12. The elevator electricity feedback method of claim 11, wherein the threshold value judgment unit transmits a high level signal to the CPU for representing that the motor driver is in the energy consuming state, and the threshold value judgment unit transmits a low level signal to the CPU for representing that the motor driver is in the energy generating state.

13. An elevator comprising a motor driver, an AC resistor, and the electricity feedback device of the claim 1.