Low voltage circuit to control high voltage transistor

摘要

A low voltage circuit is used to control a high voltage transistor which operates a high voltage motor. A blocking diode and a bootstrap capacitor are used to shift the voltage of the circuit between two levels. The circuit is enabled by inducing a current flow through an input terminal. The current is amplified and applied to a high voltage transistor. The circuit is disabled by termination of the current flow through the input terminal which causes the circuit to rapidly disable current flow through the high voltage transistor. The circuit also disables current flow through the high voltage transistor during voltage transients to prevent erroneous operation during the transients.