Lighting device, illumination device, and lighting fixture

Patent metadata

Field	Value
Publication number	US-9609710-B2
Application number	US-201514796249-A
Country	US
Kind code	B2
Filing date	Jul 10, 2015
Priority date	Jul 24, 2014
Publication date	Mar 28, 2017
Grant date	Mar 28, 2017

Abstract

A lighting device is configured such that only one of a first current control circuit and a charging current control circuit operates in any of operation modes from a first mode to a fourth mode. The lighting device is configured such that the first current control circuit and the charging current control circuit are not included in the same closed circuit.

First claim

The invention claimed is:

1. A lighting device, comprising:
a rectifier circuit configured to rectify a sine wave AC voltage inputted between a pair of input terminals of the rectifier circuit, and output a pulsating voltage from between a pair of output terminals of the rectifier circuit;
a current control circuit electrically connected in series to a light source between the pair of output terminals, and configured to control a current flowing in the light source such that the current does not exceed a predetermined value;
a storage element;
a charging current control circuit configured to control a charging current that flows to the storage element,
the storage element being electrically connected in series to the charging current control circuit between two ends of the current control circuit;
a first rectifier element that is for causing the charging current to flow to the storage element via the light source and not via the current control circuit;
a second rectifier element that is for causing a discharge current that is discharged from the storage element to flow in the light source; and
a third rectifier element that is for causing the discharge current to flow bypassing the charging current control circuit.

2. The lighting device according to claim 1 further comprising a second current control circuit, in addition to a first current control circuit as the current control circuit,
wherein the second current control circuit is electrically connected in series to a second light source between the two ends of the current control circuit, which is different from a first light source as the light source,
the second current control circuit being configured to control a current flowing in the second light source such that the current flowing in the second light source does not exceed a second predetermined value, which is equal to or different from a first predetermined value as the predetermined value.

3. The lighting device according to claim 2 , wherein the second current control circuit is configured to not control the current flowing in the second light source for a period during which the charging current flows to the storage element.

4. The lighting device according to claim 2 , wherein the current control circuit is configured to not control the current flowing in the light source for a period during which the charging current flows to the storage element.

5. The lighting device according to claim 4 , wherein the second current control circuit is configured to not control the current flowing in the second light source for a period during which the charging current flows to the storage element.

6. The lighting device according to claim 1 , wherein the current control circuit is configured to not control the current flowing in the light source for a period during which the charging current flows to the storage element.

7. The lighting device according to claim 6 , wherein the second current control circuit is configured to not control the current flowing in the second light source for a period during which the charging current flows to the storage element.

8. The lighting device according to claim 1 , wherein the charging current control circuit is configured to control the charging current to be larger than the predetermined value of the current control circuit.

9. The lighting device according to claim 1 , wherein the current control circuit is configured to not control the discharge current to be the predetermined value.

10. The lighting device according to claim 1 , further comprising a current-limiting element that is provided in a path in which the discharge current flows.

11. The lighting device according to claim 1 , further comprising a filter circuit including a low-pass filter, which is electrically connected to at least one of a side of the input terminal of the rectifier circuit and a side of the output terminal of the rectifier circuit.

12. An illumination device comprising:
one or more light sources; and
the lighting device according to claim 1 ,
the one or more light sources including one or more solid-state light-emitting elements.

13. The illumination device according to claim 12 , wherein a light source, which is electrically connected in series to the current control circuit, of the one or more light sources is configured to emit light in a case where a voltage that is not lower than a reference voltage is applied, and
the reference voltage is less than or equal to half of a peak value of the pulsating voltage.

14. A lighting fixture comprising:
the illumination device according to claim 12 ; and
a fixture body that holds the illumination device.

Assignees

• Panasonic Ip Man Co Ltd

Inventors

• Ido Shigeru
• Kido Hiroshi
• Hiramatu Akinori
• Ueda Daisuke

Classifications

• H05B45/48 Primary

  having LEDs organised in strings and incorporating parallel shunting devices · CPC title

• H05B33/083 Primary

  Electricity · mapped topic