Global closed loop control system with DV/DT control and EMI/switching loss reduction
AssigneeInternational Rectifier Corporation
InventorsEddy Ho, Yong Li, Jun Honda, David Tam, Toshio Takahashi
Life of this patent
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Abstract
A gate driver for a power switch, comprising a gate drive circuit coupled to the gate of the power switch for at least one of turning on and turning off the power switch; a gate voltage control circuit in the gate drive circuit for controlling a voltage applied to the gate of the power switch during at least one of turning on and turning off the power switch; and a signal supplied to the gate voltage control circuit indicative of a voltage rate of change per unit time to be applied in at least one of turning on and turning off the power switch.
Claims21
A gate driver for a power switch, comprising:
- a gate drive circuit coupled to the gate of the power switch for at least one of turning on and turning off the power switch;
- a gate voltage control circuit in the gate drive circuit for controlling a voltage applied to the gate of the power switch during at least one of turning on and turning off the power switch;
- and
- a signal supplied to the gate voltage control circuit indicative of a voltage rate of change per unit time to be applied in at least one of turning on and turning off the power switch.
A noise extraction circuit for a closed loop motor drive control, comprising:
- a noise energy extractor operable to sense a noise signal and determine an energy indicia of energy contained in the noise signal;
- a noise synchronization circuit coupled to the noise energy extractor and operable to determine a timing indicia related to the noise signal;
- and
- a converter coupled to the noise synchronization circuit for translating the timing and energy indicia into a digital device readable format, whereby a digital device can receive information related to the noise signal.
A method for reducing noise in a motor drive system, comprising:
- sensing noise in at least an input section of the motor drive system;
- supplying the sensed noise to a motor drive system controller;
- adaptively controlling at least one of a power converter and power inverter based on the sensed noise to reduce noise in the motor drive system.
A method for controlling a motor drive system to reduce noise, comprising:
- providing a signal related to a desired voltage rate of change per unit time for a gate of a power switch in the motor drive system;
- applying the signal to a gate driver for the power switch;
- varying the power switch turn on or turn off time based on the signal;
- and
- modifying the signal based on an adaptive trade off between noise reduction and switching losses in the power switch by changing turn on or turn off times of the power switch.
A method for sensing noise in a motor drive control system, comprising:
- obtaining a noise energy indication from a noise signal;
- obtaining a synchronized noise signal related to the indication;
- converting the synchronized noise signal to a digitized machine readable format;
- and
- providing the converted signal to a digital numerical computational device.
An integrated circuit for supplying gate command signals to a power switch, comprising:
- a gate drive output for applying turn on and turn off signals to the power switch;
- a gate drive command input for providing command signals to operate the gate drive output;
- a voltage rate of change per unit time signal input for controlling the gate drive output to produce a specified voltage applied to the gate of the power switch during turn on or turn off times;
- and
- a gate voltage control circuit coupled to the voltage rate of change per unit time signal and the gate drive output, the voltage rate of change per unit time signal influencing the gate voltage control circuit to control the voltage applied to the gate control output in conjunction with the gate command signal for turning on or turning off the power switch.
Dependencies are inferred from the claim text.