Power source unit for LED lamps, and LED lamp system
First Claim
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1. An LED lamp system comprising:
- an LED lamp including;
an LED element, anda detection resistor connected in parallel to the LED element, a resistance value of the detection resistor being not less than four and not more than six times a load impedance of the LED element at a dimming lower limit; and
a power source unit for the LED lamp including;
a DC power source portion,a lighting circuit which receives power supplied from the DC power source portion and light-controls the LED lamp, andan attachment detecting portion for detecting attachment of the LED lamp based on a voltage level changing in accordance with attachment/detachment of the detection resistor by attachment/detachment of the LED lamp.
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Abstract
A dedicated power source for LED lamps capable of reliably detecting attachment of an LED lamp is provided.
A dedicated power source has a DC power source portion, and includes a lighting circuit which receives power supplied from the DC power source portion and light-controls an LED lamp including an LED element and a detection resistor connected in parallel to the LED element and an attachment detecting portion for detecting attachment of the LED lamp based on a voltage level changing in accordance with attachment/detachment of the detection resistor by attachment/detachment of the LED lamp.
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Citations
12 Claims
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1. An LED lamp system comprising:
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an LED lamp including; an LED element, and a detection resistor connected in parallel to the LED element, a resistance value of the detection resistor being not less than four and not more than six times a load impedance of the LED element at a dimming lower limit; and a power source unit for the LED lamp including; a DC power source portion, a lighting circuit which receives power supplied from the DC power source portion and light-controls the LED lamp, and an attachment detecting portion for detecting attachment of the LED lamp based on a voltage level changing in accordance with attachment/detachment of the detection resistor by attachment/detachment of the LED lamp. - View Dependent Claims (2, 3, 4)
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5. An LED lamp system comprising:
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an LED lamp including; an LED element which has a rated current value of 350 mA in a full-lighting state and a dimming lower limit of 0.5% of the full-lighting state, and a detection resistor connected in parallel to the LED element, a resistance value of the detection resistor being not less than 270 and not more than 330 kΩ and a power source unit for the LED lamp including; a DC power source portion, a lighting circuit which receives power supplied from the DC power source portion and light-controls the LED lamp, and an attachment detecting portion for detecting attachment of the LED lamp based on a voltage level changing in accordance with attachment/detachment of the detection resistor by attachment/detachment of the LED lamp. - View Dependent Claims (6, 7, 8)
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9. An LED lamp system comprising:
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an LED lamp including; an LED element which has a rated current value of 350 mA in a full-lighting state and a dimming lower limit of 0.5% of the full-lighting state, and a detection resistor connected in parallel to the LED element, a resistance value of the detection resistor being not less than 130 and not more than 170 kΩ and a power source unit for the LED lamp including; a DC power source portion, a lighting circuit which receives power supplied from the DC power source portion and light-controls the LED lamp, and an attachment detecting portion for detecting attachment of the LED lamp based on a voltage level changing in accordance with attachment/detachment of the detection resistor by attachment/detachment of the LED lamp. - View Dependent Claims (10, 11, 12)
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Specification