Power delivery system for a light tower

Patent metadata

Field	Value
Publication number	US-10856381-B2
Application number	US-201815947440-A
Country	US
Kind code	B2
Filing date	Apr 6, 2018
Priority date	Apr 6, 2018
Publication date	Dec 1, 2020
Grant date	Dec 1, 2020

Abstract

A light tower includes a generator assembly including a prime mover, an alternator operably connected to the prime mover, the alternator configured to produce alternating current electrical energy, and a rectifier operably connected to the alternator and configured to convert alternating current electrical energy produced by the alternator to direct current electrical energy. At least one light emitting diode matrix is electrically connected to the generator assembly by an electrical connection, and a regulator is operably connected to the alternator and configured to detect a current of the direct current electrical energy in the electrical connection. In response to a detected current of the direct current electrical energy in the electrical connection, the regulator controls the alternator to adjust the current supplied to the at least one light emitting diode matrix.

First claim

What is claimed is:

1. A light tower comprising:
a generator assembly including:
a prime mover;
an alternator operably connected to the prime mover, the alternator configured to produce alternating current electrical energy; and
a rectifier operably connected to the alternator and configured to convert alternating current electrical energy produced by the alternator to direct current electrical energy;
at least one light emitting diode matrix electrically connected to the generator assembly by an electrical connection; and
a regulator operably connected to the alternator and configured to detect a current of the direct current electrical energy in the electrical connection,
wherein in response to a detected current of the direct current electrical energy in the electrical connection, the regulator controls the alternator to adjust the current supplied to the at least one light emitting diode matrix to not exceed a maximum acceptable current of the at least one light emitting diode matrix.

2. The light tower of claim 1 , wherein the prime mover is a diesel engine.

3. The light tower of claim 1 , wherein the alternator is a Lundell alternator.

4. The light tower of claim 1 , wherein the alternator is a claw-pole rotor generator.

5. The light tower of claim 1 , wherein the alternator includes an armature, the regulator is operably connected to the armature.

6. The light tower of claim 5 , wherein the regulator modulates an excitation current of the armature to adjust current output of the alternator.

7. The light tower of claim 6 , wherein the current output is a target constant current.

8. The light tower of claim 1 , further comprising a current sensor positioned in the electrical connection upstream of the at least one light emitting diode matrix and downstream of the generator assembly.

9. The light tower of claim 8 , wherein the current sensor is configured to detect the current of the direct current electrical energy in the electrical connection, and communicate the detected current to the regulator.

10. The light tower of claim 1 , wherein the at least one light emitting diode matrix includes a first light emitting diode matrix and a second light emitting diode matrix.

11. The light tower of claim 10 , further comprising:
a first current sensor positioned in the electrical connection upstream of the first light emitting diode matrix and downstream of the generator assembly, the first current sensor configured to detect a first current of the direct current electrical energy supplied to the first light emitting diode matrix and communicate the detected current to the regulator; and
a second current sensor positioned in the electrical connection upstream of the second light emitting diode matrix and downstream of the generator assembly, the second current sensor configured to detect a second current of the direct current electrical energy supplied to the second light emitting diode matrix and communicate the detected current to the regulator.

12. The light tower of claim 11 , wherein the regulator is configured to receive the detected first current and the detected second current, is configured to analyze the first current and second current in relation to a maximum acceptable current for the first light emitting diode matrix and the second light emitting diode matrix, and in response control the alternator to adjust the current supplied to the first light emitting diode matrix and the second light emitting diode matrix.

13. The light tower of claim 12 , wherein the regulator is configured to control the alternator to adjust the current supplied to the first light emitting diode matrix and the second light emitting diode matrix to not exceed the maximum acceptable current of the first light emitting diode matrix and the second light emitting diode matrix.

14. A method of controlling a current level provided by an alternator on a light tower having a prime mover that powers the alternator to produce alternating current electrical energy; and a rectifier operably connected to the alternator and configured to convert alternating current electrical energy produced by the alternator to direct current electrical energy, the method comprising:
provided direct current electrical energy to at least one light emitting diode matrix;
detecting the direct current electrical energy level provided to the at least one light emitting diode matrix; and
providing a control system that, in response to a detected level of the direct current electrical energy provided to the at least one light emitting diode matrix, controls the alternator to adjust the current supplied to the at least one light emitting diode matrix to not exceed a maximum acceptable current of the at least one light emitting diode matrix.

Assignees

• Clark Equipment Co

Inventors

• Harknett Nicholas
• Ranker Robert

Classifications

• F21V23/02

  the elements being transformers, impedances {or power supply units, e.g. a transformer with a rectifier} · CPC title

• F21L13/00

  Electric lighting devices with built-in electric generators (with solar cells F21L4/00) · CPC title

• H05B41/16

  in which the lamp is fed by DC or by low-frequency AC, e.g. by 50 cycles/sec AC {, or with network frequencies} · CPC title

• F21S9/04

  the power supply being a generator · CPC title

• F21V23/009

  the casing being inside the housing of the lighting device · CPC title