LED drive circuit, dimming device, LED illumination fixture, LED illumination device, and LED illumination system
First Claim
1. An LED drive circuit in which an alternating voltage from a phase control dimmer is input and an LED is driven;
- the LED drive circuit comprising;
a phase angle detector for detecting the phase angle at which a phase control element inside said phase control dimmer switches from off to on;
a switching power supply for feeding a current to said LED;
a switching element connected in series to said LED; and
a controller for controlling said switching power supply and said switching element in accordance with the output of said phase angle detector;
whereinsaid controller places said switching element in an always-on state in a case in which the phase angle detected by said phase angle detector is equal to or less than a predetermined value, and said controller pulse-drives said switching element in a case in which the phase angle detected by said phase angle detector is greater than said predetermined value.
1 Assignment
0 Petitions
Accused Products
Abstract
An LED drive circuit in which an alternating voltage from a phase control dimmer is input and an LED is driven. The LED drive circuit comprises a phase angle detector for detecting the phase angle at which a phase control element inside the phase control dimmer switches from off to on; a switching power supply for feeding a current to the LED; a switching element connected in series to the LED; and a controller for controlling the switching power supply and the switching element in accordance with the output of the phase angle detector; wherein the controller places the switching element in an always-on state in a case in which the phase angle detected by the phase angle detector is equal to or less than a predetermined value, and the controller pulse-drives the switching element in a case in which the phase angle detected by the phase angle detector is greater than the predetermined value.
60 Citations
22 Claims
-
1. An LED drive circuit in which an alternating voltage from a phase control dimmer is input and an LED is driven;
- the LED drive circuit comprising;
a phase angle detector for detecting the phase angle at which a phase control element inside said phase control dimmer switches from off to on; a switching power supply for feeding a current to said LED; a switching element connected in series to said LED; and a controller for controlling said switching power supply and said switching element in accordance with the output of said phase angle detector;
whereinsaid controller places said switching element in an always-on state in a case in which the phase angle detected by said phase angle detector is equal to or less than a predetermined value, and said controller pulse-drives said switching element in a case in which the phase angle detected by said phase angle detector is greater than said predetermined value. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
- the LED drive circuit comprising;
-
15. An LED illumination fixture comprising:
-
an LED drive circuit; and an LED connected to the output side of said LED drive circuit; wherein said LED drive circuit is an LED drive circuit in which an alternating voltage from a phase control dimmer is input and an LED is driven;
the LED drive circuit comprising;a phase angle detector for detecting the phase angle at which a phase control element inside said phase control dimmer switches from off to on; a switching power supply for feeding a current to said LED; a switching element connected in series to said LED; and a controller for controlling said switching power supply and said switching element in accordance with the output of said phase angle detector;
whereinsaid controller places said switching element in an always-on state in a case in which the phase angle detected by said phase angle detector is equal to or less than a predetermined value, and said controller pulse-drives said switching element in a case in which the phase angle detected by said phase angle detector is greater than said predetermined value.
-
-
16. An LED illumination device comprising:
-
an LED drive circuit; wherein said LED drive circuit is an LED drive circuit in which an alternating voltage from a phase control dimmer is input and an LED is driven;
the LED drive circuit comprising;a phase angle detector for detecting the phase angle at which a phase control element inside said phase control dimmer switches from off to on; a switching power supply for feeding a current to said LED; a switching element connected in series to said LED; and a controller for controlling said switching power supply and said switching element in accordance with the output of said phase angle detector;
whereinsaid controller places said switching element in an always-on state in a case in which the phase angle detected by said phase angle detector is equal to or less than a predetermined value, and said controller pulse-drives said switching element in a case in which the phase angle detected by said phase angle detector is greater than said predetermined value.
-
-
17. An LED illumination device comprising:
-
an LED illumination fixture; wherein said LED illumination fixture is an LED illumination fixture comprising; an LED drive circuit; and an LED connected to the output side of said LED drive circuit; wherein said LED drive circuit is an LED drive circuit in which an alternating voltage from a phase control dimmer is input and an LED is driven;
the LED drive circuit comprising;a phase angle detector for detecting the phase angle at which a phase control element inside said phase control dimmer switches from off to on; a switching power supply for feeding a current to said LED; a switching element connected in series to said LED; and a controller for controlling said switching power supply and said switching element in accordance with the output of said phase angle detector;
whereinsaid controller places said switching element in an always-on state in a case in which the phase angle detected by said phase angle detector is equal to or less than a predetermined value, and said controller pulse-drives said switching element in a case in which the phase angle detected by said phase angle detector is greater than said predetermined value.
-
-
18. An LED illumination system comprising:
-
an LED illumination fixture; and a phase control dimmer connected to the input side of said LED illumination fixture; wherein said LED illumination fixture is an LED illumination fixture comprising; an LED drive circuit; and an LED connected to the output side of said LED drive circuit; wherein said LED drive circuit is an LED drive circuit in which an alternating voltage from said phase control dimmer is input and an LED is driven;
the LED drive circuit comprising;a phase angle detector for detecting the phase angle at which a phase control element inside said phase control dimmer switches from off to on; a switching power supply for feeding a current to said LED; a switching element connected in series to said LED; and a controller for controlling said switching power supply and said switching element in accordance with the output of said phase angle detector;
whereinsaid controller places said switching element in an always-on state in a case in which the phase angle detected by said phase angle detector is equal to or less than a predetermined value, and said controller pulse-drives said switching element in a case in which the phase angle detected by said phase angle detector is greater than said predetermined value.
-
-
19. An LED illumination system comprising:
-
an LED illumination device; and a phase control dimmer connected to the input side of said LED illumination device; wherein said LED illumination device is an LED illumination device comprising; an LED drive circuit; wherein said LED drive circuit is an LED drive circuit in which an alternating voltage from said phase control dimmer is input and an LED is driven;
the LED drive circuit comprising;a phase angle detector for detecting the phase angle at which a phase control element inside said phase control dimmer switches from off to on; a switching power supply for feeding a current to said LED; a switching element connected in series to said LED; and a controller for controlling said switching power supply and said switching element in accordance with the output of said phase angle detector;
whereinsaid controller places said switching element in an always-on state in a case in which the phase angle detected by said phase angle detector is equal to or less than a predetermined value, and said controller pulse-drives said switching element in a case in which the phase angle detected by said phase angle detector is greater than said predetermined value.
-
-
20. An LED illumination system comprising:
-
an LED illumination device; and a phase control dimmer connected to the input side of said LED illumination device; wherein said LED illumination device is an LED illumination device comprising; an LED illumination fixture; wherein said LED illumination fixture is an LED illumination fixture comprising; an LED drive circuit; and an LED connected to the output side of said LED drive circuit; wherein said LED drive circuit is an LED drive circuit in which an alternating voltage from said phase control dimmer is input and an LED is driven;
the LED drive circuit comprising;a phase angle detector for detecting the phase angle at which a phase control element inside said phase control dimmer switches from off to on; a switching power supply for feeding a current to said LED; a switching element connected in series to said LED; and a controller for controlling said switching power supply and said switching element in accordance with the output of said phase angle detector;
whereinsaid controller places said switching element in an always-on state in a case in which the phase angle detected by said phase angle detector is equal to or less than a predetermined value, and said controller pulse-drives said switching element in a case in which the phase angle detected by said phase angle detector is greater than said predetermined value.
-
-
21. A dimming device comprising:
-
an LED drive circuit; and a phase control dimmer for feeding an alternating voltage to said LED drive circuit; wherein said LED drive circuit is an LED drive circuit in which an alternating voltage from said phase control dimmer is input and an LED is driven;
the LED drive circuit comprising;a phase angle detector for detecting the phase angle at which a phase control element inside said phase control dimmer switches from off to on; a switching power supply for feeding a current to said LED; a switching element connected in series to said LED; and a controller for controlling said switching power supply and said switching element in accordance with the output of said phase angle detector;
whereinsaid controller places said switching element in an always-on state in a case in which the phase angle detected by said phase angle detector is equal to or less than a predetermined value, and said controller pulse-drives said switching element in a case in which the phase angle detected by said phase angle detector is greater than said predetermined value.
-
-
22. An LED illumination system comprising:
-
an LED illumination fixture; and a dimming device connected to the input side of said LED illumination fixture; wherein said dimming device is a dimming device comprising; an LED drive circuit; and a phase control dimmer for feeding an alternating voltage to said LED drive circuit; wherein said LED drive circuit is an LED drive circuit in which an alternating voltage from said phase control dimmer is input and an LED is driven;
the LED drive circuit comprising;a phase angle detector for detecting the phase angle at which a phase control element inside said phase control dimmer switches from off to on; a switching power supply for feeding a current to said LED; a switching element connected in series to said LED; and a controller for controlling said switching power supply and said switching element in accordance with the output of said phase angle detector;
whereinsaid controller places said switching element in an always-on state in a case in which the phase angle detected by said phase angle detector is equal to or less than a predetermined value, and said controller pulse-drives said switching element in a case in which the phase angle detected by said phase angle detector is greater than said predetermined value.
-
Specification