Controller supply terminal boosting

摘要

A power conversion device includes a power switch a first main terminal coupled to a higher potential portion, a second main terminal coupled to a lower potential portion, and a tap coupled to the first main terminal to provide a current for charging a supply terminal capacitor. A controller is coupled to a control terminal of the power switch to control switching of the power switch to produce a regulated output. A supply terminal is to be coupled to a supply terminal capacitor to store a charge for supplying power to at least some of the components of the controller. A voltage regulator is coupled to regulate the charge stored and a potential on the supply terminal capacitor. The current for charging the supply terminal capacitor is selectively drawn from the tap of the power switch in response to the supply terminal capacitor being below a threshold.

主权项

1. A power conversion device comprising:
a power switch coupled to isolate in an open state a higher potential portion of the power conversion device from a lower potential portion of the power conversion device, the power switch to provide a current conduction path in a closed state, wherein the power switch comprises
a first main terminal coupled to the higher potential portion,a second main terminal coupled to the lower potential portion,a control terminal for switching the power switch between the open state and the closed state, anda tap coupled to the first main terminal of the power switch and to the higher potential portion, wherein the tap is coupled to provide a current for charging a supply terminal capacitor; a controller coupled to control switching of the power switch between the open state and the closed state to produce a regulated output; a supply terminal to be coupled to the supply terminal capacitor to store a charge for supplying power to at least some of the components of the controller; and a voltage regulator to regulate the charge stored and a potential on the supply terminal capacitor, wherein the current for charging the supply terminal capacitor is selectively drawn from the tap of the power switch in response to the potential on the supply terminal capacitor being below a threshold.