Patent ID: 8599590
Filing Date: 2013-12-03
Classification: H02M,Y02B

Abstract:
1. A detecting device for detecting a voltage on the midpoint node of a half bridge circuit that includes first and second transistors coupled to each other at the midpoint node and a bootstrap capacitor having a first terminal connected to the midpoint node and a second terminal, the device comprising: a further capacitor configured to be coupled to said second terminal of said bootstrap capacitor; a detection current generation circuit including a low impedance node and configured generate a detection current, to pass the detection current to said further capacitor during transitions of the voltage on the midpoint node from a low value to a high value and to pass the detection current from said capacitor during transitions from the high value to the low value; a reference current generation circuit configured to generate at least a first reference current; and a detection circuit configured to detect said detection current, to compare the detection current to the first reference current, and to output a first signal if the detection current is greater than the first reference current, the first signal indicating the transitions of the voltage on the midpoint node from the low value to the high value or from the high value to the low value according to said detection current.