LIMITATION OF THE LOADING OF A POWER SOURCE

• US 20100224452A1
• Filed: 05/19/2010
• Published: 09/09/2010
• Est. Priority Date: 11/20/2007
• Status: Active Grant

• Current Assignee: Kone Corporation
• Original Assignee: Kone Corporation
• Inventors: Jokinen, Risto
• Granted Patent: US 8,841,801 B2
• Time in Patent Office: Days
• US Class Current: 187/276
• CPC Class Codes: B66B 1/308 with AC powered elevator drive
• CPC Class Codes: G05F 5/00 Systems for regulating electric variables by detecting deviations in the electric input to the system and thereby controlling a device within the system to obtain a regulated output
• CPC Class Codes: H02H 3/025 Disconnection after limiting, e.g. when limiting is not sufficient or for facilitating disconnection
• CPC Class Codes: H02H 3/46 responsive to frequency deviations
• CPC Class Codes: H02H 7/263 involving transmissions of measured values comparison of currents or voltages using pilot wires H02H3/30
• CPC Class Codes: H02H 9/02 responsive to excess current current limitation for voltage regulators G05F1/573; disconnection after limiting H02H3/025
• CPC Class Codes: H02J 3/12 for adjusting voltage in ac networks by changing a characteristic of the network load
• CPC Class Codes: H02M 7/53875 with analogue control of three-phase output

Abstract

The invention relates to an arrangement and a method for limiting the input power of a power supply appliance (1) fitted between a power source (2) and a load (3). The arrangement according to the invention comprises a power supply appliance (1) fitted between a power source (2) and the load to be supplied (3), which power supply appliance (1) is fitted to limit its input power on the basis of the status of the aforementioned power source (2).

Claims

1. Arrangement for limiting power, which arrangement comprises a power supply appliance (1) fitted between the power source (2) and the load (3) to be supplied, characterized in that the power supply appliance (1) is fitted to limit its input power on the basis of the status of the aforementioned power source (2).

2. Arrangement according to claim 1, characterized in that the power supply appliance (1) is fitted to determine the status of the power source (2), and to limit its input power in stages on the basis of the determined status of the power source (2).

3. Arrangement according to claim 1 or 2, characterized in that the power supply appliance (1) is fitted to disconnect its power supply if the determined status of the power source (2) so requires.

4. Arrangement according to claim 1, characterized in that the aforementioned power source (2) is an alternating voltage source and in that the power supply appliance (1) comprises a determination (5) of the status of the alternating voltage source (2) on the basis of the supply frequency of the alternating voltage source.

5. Arrangement according to claim 1, characterized in that the power supply appliance (1) comprises a determination of the status of the power source (2) on the basis of the status signal (6) of the power source.

6. Arrangement according to claim 1, characterized in that the aforementioned power source (2) is an alternating voltage source and in that the power supply appliance (1) is fitted to limit its input power on the basis of a reduction of the frequency of the alternating voltage source (2).

7. Arrangement according to claim 1, characterized in that the aforementioned power source (2) is an alternating voltage source and in that the power supply appliance (1) is fitted to limit its input power on the basis of frequency integral of the alternating voltage source (2).

14. Arrangement according to claim 2, characterized in that the aforementioned power source (2) is an alternating voltage source and in that the power supply appliance (1) comprises a determination (5) of the status of the alternating voltage source (2) on the basis of the supply frequency of the alternating voltage source.

15. Arrangement according to claim 3, characterized in that the aforementioned power source (2) is an alternating voltage source and in that the power supply appliance (1) comprises a determination (5) of the status of the alternating voltage source (2) on the basis of the supply frequency of the alternating voltage source.

16. Arrangement according to claim 2, characterized in that the power supply appliance (1) comprises a determination of the status of the power source (2) on the basis of the status signal (6) of the power source.

17. Arrangement according to claim 3, characterized in that the power supply appliance (1) comprises a determination of the status of the power source (2) on the basis of the status signal (6) of the power source.

18. Arrangement according to claim 4, characterized in that the power supply appliance (1) comprises a determination of the status of the power source (2) on the basis of the status signal (6) of the power source.

8. Elevator system, which comprises an arrangement for limiting power, which arrangement comprises a power supply appliance fitted between the power supply circuit of the elevator and the power source, characterized in that the power supply appliance (1) is fitted to limit its input power on the basis of the status of the aforementioned power source (2).

9. Method for limiting the input power of a power supply appliance (1), characterized in that

a power supply appliance (1) is connected to the power source (2)

the input power of the power supply appliance (1) is limited on the basis of the status of the power source (2).

10. Method according to claim 9, characterized in that

the status of the power source (2) is determined with the power supply appliance (1)

the input power of the power supply appliance (1) is limited in stages on the basis of the determined status of the power source (2).

11. Method according to claim 9 or 10, characterized in that

the power supply of the power supply appliance is disconnected if the determined status of the power source (2) so requires.

12. Method according to claim 9, characterized in that

the input power of the power supply appliance (1) is limited on the basis of the supply frequency of the alternating voltage source (2).

13. Method according to claim 12, characterized in that

a limit value is set for the supply frequency of the alternating voltage source (2)

the input power of the power supply appliance (1) is limited when the supply frequency of the alternating voltage source (2) decreases below the aforementioned limit value for the supply frequency.