Multi-stage gate turn-off with dynamic timing
First Claim
1. A circuit for turning off a power semiconductor switch, the circuit comprising:
- a turn-off transistor coupled to switch a signal for turning off the power semiconductor switch onto a control terminal of the power semiconductor switch; and
a feedback control loop for controlling a voltage on the control terminal of the power semiconductor switch during turn-off, the feedback control loop comprisinga feedback path to feedback a measurement of the voltage of the control terminal of the power semiconductor switch,a control terminal reference voltage generator to generate a time-dependent reference voltage, andan error amplifier to generate an error signal representative of a difference between the voltage of the control terminal and the time-dependent reference voltage, anda forward path to convey the error signal forward for controlling the switching of the signal for turning off the power semiconductor switch onto the control terminal of the power semiconductor switch by the turn-off transistor.
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Accused Products
Abstract
A circuit for turning off a power semiconductor switch includes a turn-off transistor coupled to switch a signal for turning off the power semiconductor switch onto a control terminal of the power semiconductor switch and a feedback control loop for controlling a voltage on the control terminal of the power semiconductor switch during turn-off. The feedback loop includes a feedback path to feedback a measurement of the voltage of the control terminal of the power semiconductor switch, a control terminal reference voltage generator to generate a time-dependent reference voltage, an error amplifier to generate an error signal representative of a difference between the voltage of the control terminal and the time-dependent reference voltage, and a forward path to convey the error signal forward for controlling the switching of the signal for turning off the power semiconductor switch onto the control terminal of the power semiconductor switch by the turn-off transistor.
44 Citations
23 Claims
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1. A circuit for turning off a power semiconductor switch, the circuit comprising:
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a turn-off transistor coupled to switch a signal for turning off the power semiconductor switch onto a control terminal of the power semiconductor switch; and a feedback control loop for controlling a voltage on the control terminal of the power semiconductor switch during turn-off, the feedback control loop comprising a feedback path to feedback a measurement of the voltage of the control terminal of the power semiconductor switch, a control terminal reference voltage generator to generate a time-dependent reference voltage, and an error amplifier to generate an error signal representative of a difference between the voltage of the control terminal and the time-dependent reference voltage, and a forward path to convey the error signal forward for controlling the switching of the signal for turning off the power semiconductor switch onto the control terminal of the power semiconductor switch by the turn-off transistor. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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19. A turn-off circuit for a semiconductor switch, wherein the turn-off circuit comprises:
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an element having a variable resistance, said element being coupled to a control input of the semiconductor switch; a detection circuit, which is designed to detect an end of a Miller plateau in a control input voltage or in a control input current of the semiconductor switch; and a control circuit, which is designed to control a resistance value of the element having a variable resistance in such a way that a voltage which is present at the control input of the semiconductor switch is reduced after the end of a Miller plateau at a predetermined rate. - View Dependent Claims (20, 21, 22, 23)
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Specification