LED driving circuit and LED lighting device
A light emitting diode (LED) driving circuit including a dimmer modulating an AC voltage input depending on a selected dimming level, a rectifying unit performing a full-wave rectification for an AC voltage to generate and output a driving voltage, first and second dimming level detecting units receiving the driving voltage of the rectifying unit to detect the selected dimming level, and outputting first and second dimming level signals depending on the detected dimming level, a first driving module controlling a first LED light emitting unit using the first dimming level signal of the first dimming level detecting unit, and a second driving module controlling a second LED light emitting unit using the second dimming level signal of the second dimming level detecting unit, in which the first and second driving modules control the first and second LED light emitting units, respectively.
1. A light emitting diode (LED) driving circuit comprising:
a dimmer modulating an alternating current (AC) voltage input depending on a selected dimming level and output a phase-modulated AC voltage;
a rectifying unit disposed downstream of the dimmer to perform a full-wave rectification for the phase-modulated AC voltage received to generate and output a driving voltage;
first and second dimming level detecting units receiving the driving voltage of the rectifying unit to detect the selected dimming level, and outputting first and second dimming level signals depending on the detected dimming level;
a first driving module controlling a first LED light emitting unit using the first dimming level signal of the first dimming level detecting unit; and
a second driving module controlling a second LED light emitting unit using the second dimming level signal of the second dimming level detecting unit,
wherein the first driving module and the second driving module control the first and second LED light emitting, respectively.
2. The LED driving circuit of claim 1 , wherein:
the first and second LED light emitting units are driven to be inversely proportionate to each other; and
the first and second dimming level signals are direct current (DC) signals having constant voltage values that are inversely proportionate to each other.
3. The LED driving circuit of claim 1 , wherein the first driving module sequentially drives the first LED light emitting unit during a plurality of sections depending on the modulated AC voltage.
4. The LED driving circuit of claim 1 , wherein the second driving module sequentially drives the second LED light emitting unit during a plurality of sections depending on the modulated AC voltage.
5. The LED driving circuit of claim 1 , wherein:
the second driving module comprises a pulse width modulating unit generating a pulse width modulated signal; and
the second LED light emitting unit is driven by the pulse width modulated signal.
6. The LED driving circuit of claim 1 , wherein the dimmer is any one of a triode for alternating current (TRIAC) dimmer controlling a phase of AC power using a TRIAC, a pulse width modulation (PWM) dimmer, and an analog voltage dimmer changing the AC voltage.
7. A light emitting diode (LED) driving circuit comprising:
a first rectifying unit performing a full-wave rectification for an alternating current (AC) voltage input from an AC voltage source to generate and output a first driving voltage;
a first driving module responding to the first driving voltage to regularly and sequentially drive a first LED light emitting unit;
a dimmer modulating the AC voltage input from the AC voltage source depending on a selected dimming level;
a second rectifying unit performing a full-wave rectification for an AC voltage to generate and output a second driving voltage;
a dimming level detecting unit receiving the second driving voltage of the second rectifying unit to detect the selected dimming level, and outputting a dimming level signal depending on the detected dimming level; and
a second driving module controlling a second LED light emitting unit using the dimming level signal of the dimming level detecting unit,
wherein driving of the first LED light emitting unit by the first driving voltage and driving of the second LED light emitting unit by the dimming level signal are controlled simultaneously.
8. The LED driving circuit of claim 7 , wherein the second driving module sequentially drives the second LED light emitting unit during a plurality of sections depending on the modulated AC voltage.
9. The LED driving circuit of claim 7 , wherein:
the second driving module comprises a pulse width modulating unit generating a pulse width modulated signal; and
the pulse width modulated signal drives the second LED light emitting unit.
10. The LED driving circuit of claim 7 , wherein the dimmer is any one of a triode for alternating current (TRIAC) dimmer controlling a phase of AC power using a TRIAC, a pulse width modulation (PWM) dimmer, and an analog voltage dimmer changing the AC voltage.
11. The LED driving circuit of claim 7 , wherein the dimmer is a triode for alternating current (TRIAC) dimmer and is classified into a plurality of sections depending on phase-modulated magnitude.
12. A light emitting diode (LED) lighting device comprising:
a dimmer modulating an alternating current (AC) voltage input depending on a selected dimming level and output a phase-modulated AC voltage;
a rectifying unit disposed downstream of the dimmer to perform a full-wave rectification for the phase-modulated AC voltage to generate and output a driving voltage;
first and second dimming level detecting units receiving the driving voltage of the rectifying unit to detect the selected dimming level, and outputting first and second dimming level signals depending on the detected dimming level;
a first driving module controlling a first LED light emitting unit using the first dimming level signal of the first dimming level detecting unit;
a second driving module controlling a second LED light emitting unit using the second dimming level signal of the second dimming level detecting unit;
the first LED light emitting unit emitting light according to a control of the first driving module; and
the second LED light emitting unit emitting light according to a control of the second driving module,
wherein driving of the first LED light emitting unit by the first driving voltage and driving of the second LED light emitting unit by the dimming level signal are controlled simultaneously.
13. The LED lighting device of claim 12 , wherein:
the first and second LED light emitting units are driven to be inversely proportionate to each other; and
the first and second dimming level signals are direct current (DC) signals having constant voltage values that are inversely proportionate to each other.
14. The LED lighting device of claim 12 , wherein the first driving module sequentially drives the first LED light emitting unit during a plurality of sections depending on the modulated AC voltage.
15. The LED lighting device of claim 12 , wherein the second driving module sequentially drives the second LED light emitting unit during a plurality of sections depending on the modulated AC voltage.
16. The LED lighting device of claim 12 , wherein:
the second driving module comprises a pulse width modulating unit generating a pulse width modulated signal; and
the second LED light emitting unit is driven by the pulse width modulated signal.
17. The LED lighting device of claim 12 , wherein the dimmer is any one of a triode for alternating current (TRIAC) dimmer controlling a phase of AC power using a TRIAC, a pulse width modulation (PWM) dimmer, and an analog voltage dimmer changing the AC voltage.
18. The LED lighting device of claim 12 , wherein the second LED light emitting unit comprises a red LED.
19. A light emitting diode (LED) lighting device comprising:
a first rectifying unit performing a full-wave rectification for an alternating current (AC) voltage input from an AC voltage source to generate and output a first driving voltage;
a first driving module responding to the first driving voltage to regularly and sequentially drive a first LED light emitting unit;
a dimmer modulating the AC voltage input from the AC voltage source depending on a selected dimming level;
a second rectifying unit performing a full-wave rectification for an AC voltage to generate and output a second driving voltage;
a dimming level detecting unit receiving the second driving voltage of the second rectifying unit to detect the selected dimming level, and outputting a dimming level signal depending on the detected dimming level;
a second driving module controlling a second LED light emitting unit using the dimming level signal of the dimming level detecting unit;
the first LED light emitting unit emitting light according to a control of the first driving module; and
the second LED light emitting unit emitting light according to a control of the second driving module,
wherein driving of the first LED light emitting unit by the first driving voltage and driving of the second LED light emitting unit by the dimming level signal are controlled simultaneously.
20. The LED lighting device of claim 19 , wherein the second driving module sequentially drives the second LED light emitting unit during a plurality of sections depending on the modulated AC voltage.
21. The LED lighting device of claim 19 , wherein:
the second driving module comprises a pulse width modulating unit generating a pulse width modulated signal; and
the second LED light emitting unit is driven by the pulse width modulated signal.
22. The LED lighting device of claim 19 , wherein the dimmer is any one of a triode for alternating current (TRIAC) dimmer controlling a phase of AC power using a TRIAC, a pulse width modulation (PWM) dimmer, and an analog voltage dimmer changing the AC voltage.
23. The LED lighting device of claim 19 , wherein the dimmer is a triode for alternating current (TRIAC) dimmer and is classified into a plurality of sections depending on phase-modulated magnitude.
24. The LED lighting device of claim 19 , wherein the second LED light emitting unit comprises a red LED.