Abstract: A non-isolated capacitive AC-DC conversion power supply includes a current limiting input module that receives AC input power and has an output capacitor that supplies DC power. Charge storage stages have charge storage capacitors, a rectifier supplying rectified current from the input module to charge the charge storage capacitors and the output capacitor during a first part-cycle of the AC input power. The charge storage stages also include current amplifiers and unidirectional elements that conduct discharge current from the charge storage capacitors to charge the output capacitor during a second part-cycle of the AC input power. Ground of the DC output can be connected to the live AC input.

Abstract: A digital device generates a fixed duty cycle signal with an internal oscillator after a Power-On-Reset (POR). This fixed duty cycle signal is output on a signal pin that normally is used for a PWM control signal. The fixed duty cycle signal is used to stimulate the voltage generation circuits so as to power up the digital device for initialization thereof. Once the digital device has powered-up and initialized, the digital device switches over to normal operation for control of the power system.

Abstract: A digital device generates a fixed duty cycle signal with an internal oscillator after a Power-On-Reset (POR). This fixed duty cycle signal is output on a signal pin that normally is used for a PWM control signal. The fixed duty cycle signal is used to stimulate the voltage generation circuits so as to power up the digital device for initialization thereof. Once the digital device has powered-up and initialized, the digital device switches over to normal operation for control of the power system.