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US 11,606,086 B2Granted
Desaturation circuit for MOSFET with high noise immunity and fast detection
AssigneeHamilton Sundstrand Corporation
InventorsBo Liu, Yongduk Lee, Xin Wu
Life of this patent
Estimating the term…
Abstract
A desaturation protection circuit is provided. Aspects includes a main gate driver circuit driving a gate for a switch, a desaturation gate driver circuit coupled to a drain terminal of the switch, a PWM signal supply circuit configured to supply a PWM signal to the desaturation gate driver circuit, and a delay circuit, the delay circuit configured to delay the PWM signal from the PWM signal supply circuit to the desaturation gate driver circuit during a turn-on event for the switch.
Claims18
A desaturation protection circuit comprising:
- a main gate driver circuit driving a gate for a switch;
- a desaturation gate driver circuit comprising a resistor-capacitor circuit coupled to a drain terminal of the switch;
- a PWM signal supply circuit configured to supply a PWM signal to the desaturation gate driver circuit;
- and
- a delay circuit, the delay circuit configured to delay the PWM signal from the PWM signal supply circuit to the desaturation gate driver circuit during a turn-on event for the switch,
- wherein the delay circuit comprises a first resistor, a first capacitor (Cd), and a first diode (Dd), wherein the first diode (Dd) is connected to the delay circuit, and wherein the first resistor (Rd) and the first capacitor (Cd) are connected together to form a low pass filter that that delays the turn-on event,
- wherein the resistor-capacitor circuit comprises a second resistor (R2) and a blanking capacitor (Cblank) connected in parallel with second resistor (R2), and
- wherein at turn-off, the first diode (Dd) conducts without affecting a turn-off performance for discharging of the blanking capacitor (Cblank).
5 more elements
A desaturation protection circuit comprising:
- a desaturation gate driver circuit comprising a resistor-capacitor circuit connected to a blocking diode, the desaturation gate driver circuit coupled to a drain terminal of a switch through a blocking diode;
- a PWM signal supply circuit configured to supply a PWM signal to the desaturation gate driver circuit;
- and
- a delay circuit, the delay circuit configured to delay the PWM signal from the PWM signal supply circuit to the desaturation gate driver circuit during a turn-on event for the switch,
- wherein delay circuit comprises a first resistor, a first capacitor (Cd), and a first diode (Dd), wherein the first diode (Dd) is connected to the delay circuit, and wherein the first resistor (Rd) and the first capacitor (Cd) are connected together to form a low pass filter that that delays the turn-on event,
- wherein the resistor-capacitor circuit comprises a second resistor (R2) and a blanking capacitor (Cblank) connected in parallel with second resistor (R2), and
- wherein the desaturation gate driver circuit (104) controls charging and discharging of the blanking capacitor (Cblank), and
- wherein at turn-off, the first diode (Dd) conducts without affecting the turn-off performance for discharging of the blanking capacitor (Cblank).
5 more elements
Dependencies are inferred from the claim text.