US 11,990,898 B2
Parasitic immune isolated drive
Francisco X. Romo, Rockford, IL (US); and Christopher D. Thornton, St. Charles, IL (US)
Assigned to Hamilton Sundstrand Corporation, Charlotte, NC (US)
Filed by Hamilton Sundstrand Corporation, Charlotte, NC (US)
Filed on Feb. 23, 2022, as Appl. No. 17/679,016.
Prior Publication US 2023/0268858 A1, Aug. 24, 2023
Int. Cl. H02M 3/156 (2006.01); H02M 1/32 (2007.01); H02M 3/155 (2006.01); H02M 3/335 (2006.01); H03K 17/691 (2006.01)
CPC H03K 17/691 (2013.01) [H02M 1/32 (2013.01); H02M 3/155 (2013.01); H02M 3/33546 (2013.01)] 16 Claims
OG exemplary drawing
 
1. An isolated drive for a generator control unit, comprising:
a gate driver configured to operatively connect to a switch to drive the switch between a first state and a second state;
a transformer configured to power the gate driver and provide an ON/OFF signal to the gate driver;
an input line configured to connect a first side of the transformer to the gate driver;
a floating return line configured to connect a second side of the transformer directly to a source terminal of the switch such that current flowing through a parasitic capacitance across the transformer and/or a drive circuit bypasses the gate driver and flows to the floating return line; and
one or more electrical components operatively connected between the transformer and the switch, wherein the one or more electrical components include:
at least a first diode disposed in the input line, upstream of a first capacitor configured to control a flow of current in the input line between the transformer and an input terminal of the gate driver;
a second capacitor operatively connected between the input line and the floating return line, downstream of a logic module, configured to charge with current from the transformer in the first state of the switch and discharge current in the second state of the switch; and
a second diode in the input line disposed between the gate driver and the second capacitor configured to control a flow of current in the input line between the transformer and the source terminal of the gate driver.