Start-up voltage for solid-state lighting controller

A method of operating a controller, the controller including a transformer, and a control circuit having a bias voltage input, the control circuit activating when voltage applied to the bias voltage input reaches a threshold, the transformer having feedback output to the bias voltage input;

• the method comprising:
• applying start-up bias voltage to the bias voltage input, by providing a resonant current to charge a start-up bias capacitor, wherein voltage on the start-up bias capacitor is applied to the bias voltage input as the start-up bias voltage;
• and
• automatically cutting off the resonant current, using at least one diode, when the transformer feedback output is above the threshold;
• wherein:
• the providing the resonant current includes a dividing a supply voltage to produce a divided voltage for the resonant current;
• and
• the dividing the supply voltage is adjusted so that when the transformer feedback output is above the threshold, voltage on the transformer feedback output is above the divided voltage, thereby turning off the at least one diode.

A method of operating a solid-state lighting controller, the solid-state lighting controller including a transformer, and a control circuit having a bias voltage input, the transformer having feedback output to the bias voltage input;

• the method comprising:
• applying start-up bias voltage to the bias voltage input, by providing a start-up current to charge a start-up bias capacitor, wherein voltage on the start-up bias capacitor is applied to the bias voltage input as the start-up bias voltage;
• monitoring, by the solid state lighting controller, voltage at the bias voltage input;
• activating, by the solid state lighting controller, of a driving signal when the voltage at the bias voltage input reaches a threshold, whereby current flows in the transformer, including in the transformer feedback output, to charge an operating mode bias capacitor, thereby generating an operating mode bias voltage;
• and
• discontinuing the start-up current, using at least one diode, when the operating mode bias voltage reaches the threshold;
• wherein:
• the providing the start-up current includes a dividing a supply voltage to produce a divided voltage for the start-up current;
• and
• the dividing the supply voltage is adjusted so that when the transformer feedback output is above the threshold, voltage on the transformer feedback output is above the divided voltage, thereby turning off the at least one diode.