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US 9,041,379 B2Granted
Bootstrap startup and assist circuit
AssigneeLumastream Canada Ulc
InventorSteven Lyons
Life of this patent
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Abstract
A bootstrap assist circuit and a startup circuit comprising a voltage controlled switch and a startup ramp voltage generator connected to the voltage controlled switch that will control a high side switch, a dimming interface or an enable/disable input function. Said system is used to provide a bootstrap technique to continuously switch a floating high side switch (MOSFET) by continuously charging a capacitor and then “level shifting” said capacitor voltage across the gate and source of the said high side switch to turn the switch on.
Claims7
A method of bootstrap startup comprising:
- receiving an input signal to begin bootstrapping;
- initiating a startup voltage ramp;
- initiating an artificial ramp current sense;
- determining if a voltage controlled switch is reverse-biased;
- and
- terminating the artificial ramp current sense if the voltage controlled switch is reverse-biased.
3 more elements
Dependencies are inferred from the claim text.