POWER CONTROL OF TRANSPORT SYSTEM

• US 20100096931A1
• Filed: 12/18/2009
• Published: 04/22/2010
• Est. Priority Date: 06/20/2007
• Status: Active Grant

• Current Assignee: Kone Corporation
• Original Assignee: Kone Corporation
• Inventors: JAHKONEN, Pekka
• Granted Patent: US 8,053,931 B2
• Time in Patent Office: Days
• US Class Current: 307/80
• CPC Class Codes: B66B 1/30 effective on driving gear , e.g. acting on power electronics, on inverter or rectifier controlled motor
• CPC Class Codes: H02M 5/458 using semiconductor devices only
• CPC Class Codes: H02P 3/18 for stopping or slowing an ac motor

Abstract

The power control of a transport system comprises an electric motor for moving the transport appliance as well as a power supply appliance of the motor, which comprises an intermediate circuit. The power supply appliance of the motor is fitted between the power source and the electric motor. The transport system further comprises a rectifier of the intermediate circuit power, which is fitted between the intermediate circuit of the power supply appliance of the motor and the supplied load for transmitting intermediate circuit power to the supplied load.

Claims

1. A rectifier of the intermediate circuit power, which contains interfaces to the intermediate circuit of the power supply appliance as well as to the supplied load;

which power supply appliance of the intermediate circuit contains interfaces to a first power source as well as to a second power source;

and which rectifier of the intermediate circuit power contains a control, in which is an input for the signal indicating the power supply of the second power source;

and which control is fitted to control the rectifier of the intermediate circuit power in response to the aforementioned signal indicating the power supply of the second power source, for supplying to the load the power transmitted to the intermediate circuit from the second power source;

wherein the rectifier of the intermediate circuit power is single-phase, comprising a choke and a changeover switch, and the choke is fitted between the first connection point of the supplied load and the output of the changeover switch, at least two capacitors in series are connected in parallel with the changeover switch, and the second connection point of the supplied load is connected between the capacitors.

3. Power control according to claim 1, wherein the rectifier of the intermediate circuit power can be controlled according to the connected load.

4. Power control according to claim 1, wherein the supplied load comprises a power resistor.

5. Power control according to claim 1, wherein the supplied load comprises a power supply of the electrification of a transport system.

6. Power control according to claim 1, wherein the rectifier of the intermediate circuit power is fitted to supply power from the intermediate circuit of the power supply appliance of the motor to a phase of the electricity network.

7. Power control according to claim 1, wherein the positive and negative changeover contact of the rectifier of the intermediate circuit power can be controlled into a conductive state simultaneously for the dynamic braking of the motor.

8. Power control according to claim 1, wherein the rectifier of the intermediate circuit power comprises a definition of the power to be supplied to the load.

9. Power control according to claim 1, wherein the rectifier of the intermediate circuit power comprises a measurement of the current of the load, and in that the status of the load is estimated on the basis of the measured current.

14. Power control according to claim 3, wherein the supplied load comprises a power resistor.

16. Power control according to claim 3, wherein the supplied load comprises a power supply of the electrification of a transport system.

17. Power control according to claim 4, wherein the supplied load comprises a power supply of the electrification of a transport system.

19. Power control according to claim 3, wherein the rectifier of the intermediate circuit power is fitted to supply power from the intermediate circuit of the power supply appliance of the motor to a phase of the electricity network.

20. Power control according to claim 4, wherein the rectifier of the intermediate circuit power is fitted to supply power from the intermediate circuit of the power supply appliance of the motor to a phase of the electricity network.

2. Power control of a transport system, which power control comprises an electric motor for moving the transport appliance as well as a power supply appliance of the motor, which comprises an intermediate circuit and which power supply appliance of the motor is fitted between the power source and the electric motor, wherein the power control further comprises a single-phase rectifier of the intermediate circuit power, which single-phase rectifier of the intermediate circuit power is fitted between the intermediate circuit of the power supply appliance of the motor and the supplied load, for supplying power returning to the intermediate circuit from the electric motor onwards to the load, and which single-phase rectifier of the intermediate circuit power comprises a choke and also a changeover switch;

and in that the choke is fitted between the first connection point of the supplied load and the output of the changeover switch of the rectifier of the intermediate circuit power, at least two capacitors in series are connected in parallel with the changeover switch, and in that the second connection point of the supplied load is connected between the capacitors.

12. Power control according to claim 2, wherein the rectifier of the intermediate circuit power can be controlled according to the connected load.

13. Power control according to claim 2, wherein the supplied load comprises a power resistor.

15. Power control according to claim 2, wherein the supplied load comprises a power supply of the electrification of a transport system.

18. Power control according to claim 2, wherein the rectifier of the intermediate circuit power is fitted to supply power from the intermediate circuit of the power supply appliance of the motor to a phase of the electricity network.

10. Method for controlling the power of a transport system, in which method:

a power supply appliance of the motor is fitted between the power source and the electric motor

a single-phase rectifier of the intermediate circuit power is fitted between the intermediate circuit of the power supply appliance of the motor and the supplied load

wherein;

a changeover switch is fitted in the single-phase rectifier of the intermediate circuit power,

a choke is fitted between the output of the changeover switch and the first connection point of the supplied load

at least two capacitors in series are connected in parallel with the aforementioned changeover switch

a second connection point of the supplied load is connected between the capacitors.

11. Method according to claim 10, wherein:

the intermediate circuit voltage is measured

the power supply from the intermediate circuit to the supplied load is started with the single-phase rectifier of the intermediate circuit po'"'"'wer after the intermediate circuit voltage has exceeded the limit value of voltage.

the power supply from the intermediate circuit to the supplied load is stopped after the intermediate circuit voltage has fallen below the limit value of voltage.