LED DRIVE CIRCUIT AND LED LIGHT-EMITTING DEVICE
First Claim
Patent Images
1. An LED drive circuit, comprising:
- a switch circuit having a secondary side connected in series between an LED unit and an alternating-current power source that supplies power to the LED unit to drive the LED unit, the switch circuit controlling an electrical connection between the alternating-current power source and the LED unit; and
a driver circuit controlling timing with which the secondary side of the switch circuit is brought into/out of conduction by feeding a control signal to a primary side of the switch circuit every half wave of alternating-current power from the alternating-current power source,wherein the LED unit is composed of a first LED group in which a plurality of first LEDs are connected in series in a same forward direction and a second LED group in which a plurality of second LEDs are connected in series in a forward direction that is opposite to the forward direction of the first LEDs, the first LED group and the second LED group being connected in parallel in such a way as to point in different directions,wherein the driver circuit separately controls durations of light emission of the first and second LED groups by controlling the timing with which the secondary side of the switch circuit is brought into/out of conduction.
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Abstract
A driver circuit 3 feeds a pulse signal to an SSR 2 every half wave of alternating-current power from a commercial power source 4, and thereby separately controls the amounts of emitted light of LED groups 1x and 1y forming an LED unit 1, the LED groups 1x and 1y being connected in parallel in such a way as to point in different directions. That is, a first pulse signal for controlling the duration of light emission of the LED group 1x and a second pulse signal for controlling the duration of light emission of the LED group 1y are fed to the SSR 2 from the driver circuit 3.
104 Citations
17 Claims
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1. An LED drive circuit, comprising:
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a switch circuit having a secondary side connected in series between an LED unit and an alternating-current power source that supplies power to the LED unit to drive the LED unit, the switch circuit controlling an electrical connection between the alternating-current power source and the LED unit; and a driver circuit controlling timing with which the secondary side of the switch circuit is brought into/out of conduction by feeding a control signal to a primary side of the switch circuit every half wave of alternating-current power from the alternating-current power source, wherein the LED unit is composed of a first LED group in which a plurality of first LEDs are connected in series in a same forward direction and a second LED group in which a plurality of second LEDs are connected in series in a forward direction that is opposite to the forward direction of the first LEDs, the first LED group and the second LED group being connected in parallel in such a way as to point in different directions, wherein the driver circuit separately controls durations of light emission of the first and second LED groups by controlling the timing with which the secondary side of the switch circuit is brought into/out of conduction. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. An LED light-emitting device, comprising:
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an LED unit composed of a first LED group in which a plurality of first LEDs are connected in series in a same forward direction and a second LED group in which a plurality of second LEDs are connected in series in a forward direction that is opposite to the forward direction of the first LEDs, the first LED group and the second LED group being connected in parallel in such a way as to point in different directions; an alternating-current power source connected in series to the LED unit; and an LED drive circuit controlling the LED unit and the alternating-current power source to be electrically connected/disconnected, wherein the LED drive circuit comprises; a switch circuit having a secondary side connected in series between the LED unit and the alternating-current power source, the switch circuit controlling an electrical connection between the alternating-current power source and the LED unit; and a driver circuit separately controlling durations of light emission of the first and second LED groups by controlling timing with which the secondary side of the switch circuit is brought into/out of conduction by feeding a control signal to a primary side of the switch circuit every half wave of alternating-current power from the alternating-current power source.
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Specification