Energy Recovery of Dimmer Turn-on Spike
Description
Detects the leading edge of a phase
controlled input signal through the rising
spike of the input current or input voltage
when a dimmer turns on
Energy from the spike is captured across a
resistor then filtered and stored on a
capacitor. The stored energy can be used for
any control purpose
Recovered and stored energy may be used to
generate a control signal to maintain input
current above the minimum holding current
of the dimmer by either:
Figure 1. Recovered spike energy used to engage an active bleeder
Engaging an active current compensator (i.e.
bleeder)
Modifying the feedback control signal
Figure 2. Recovered spike energy used to modify the feedback signal
US 9,543,845
Rev: 1; DEC 2016; PI.0420
1
World Headquarters 5245 Hellyer Avenue, San Jose, CA 95138, USA, Main: +1-408-414-9200
Customer Service Phone: +1-408-414-9665, Fax: +1-408-414-9765, Email: [email protected]
On the Web www.power.com
Energy Recovery of Dimmer Turn-on Spike
Benefits
Light emitting diode (LED) drivers with leading edge dimming may achieve no flicker, smooth
dimming
Reduces loss and heat dissipation and increases efficiency
Activation of the bleeder can be auto-synchronized with the turning on of the dimmer
Modified feedback signal increases load demand and maintain the input current above the holding
current
Figure 4. Example spike energy recovery circuit to modify feedback signal
Figure 3. Example spike energy recovery circuit to engage bleeder
US 9,543,845
Rev: 1; DEC 2016; PI.0420
2
World Headquarters 5245 Hellyer Avenue, San Jose, CA 95138, USA, Main: +1-408-414-9200
Customer Service Phone: +1-408-414-9665, Fax: +1-408-414-9765, Email: [email protected]
On the Web www.power.com