公开(公告)号：US09954353B2

公开(公告)日：2018-04-24

申请号：US14933394

申请日：2015-11-05

Applicant: GM Global Technology Operations LLC

Inventor： S. M. Nayeem Hasan ,  Timothy P. Philippart

IPC: B60L11/18 ,  H02H9/00

CPC classification number: H02H9/002 ,  B60L11/16 ,  B60L11/1803 ,  B60L2240/527 ,  B60L2240/547 ,  B60L2240/80 ,  B60L2270/20 ,  H02H9/001

Abstract: A pre-charge circuit is disclosed for a vehicle including a battery and a load. The pre-charge circuit includes a time delay circuit configured to, in response to receiving power from the battery, generate a first voltage. The first voltage increases from a first value toward a second value. The pre-charge circuit includes a switch control circuit configured to, in response to the first voltage, provide a second voltage that follows the first voltage. The pre-charge circuit includes a switching circuit configured to selectively connect the battery to the load based on the second voltage and disconnect the load from the battery in response to the second voltage reaching a predetermined threshold value. The pre-charge circuit includes an output circuit configured to restrict an amount of power and inrush current that is provided from the battery to the load through the switching circuit.

公开(公告)号：US10569777B2

公开(公告)日：2020-02-25

申请号：US15429218

申请日：2017-02-10

Applicant: GM Global Technology Operations LLC

Inventor： S. M. Nayeem Hasan ,  Timothy Philippart

IPC: B60W30/18 ,  F02N11/08 ,  H02J7/00 ,  F02M51/06

Abstract: A circuit for compensating for low battery voltage available to power a load includes a power source, an inductor electrically coupled to the power source, a first switch configured to control current flow from the power source to the inductor, and a first diode connecting a first supply rail to the inductor. The circuit also includes a second switch configured to electrically connect the anode of a second diode to the inductor, with the cathode of the second diode connected to a second supply rail. A controller is configured to cycle the first and second switches to achieve a desired voltage values at the first and second supply rails. The second supply rail is electrically connected to the load. The controller is configured to enable the second switch to switch to a closed state only when the voltage at the power source is below a first predetermined threshold voltage.

公开(公告)号：US10337930B2

公开(公告)日：2019-07-02

申请号：US14709782

申请日：2015-05-12

Applicant: GM Global Technology Operations LLC

Inventor： S. M. Nayeem Hasan ,  Bryan M. Ludwig ,  David P. Tasky

IPC: G01K7/01 ,  H01L29/739 ,  G01K7/42

Abstract: A number of variations may include a method which may include determining a temperature rise in an IGBT junction without the use of a temperature estimation or measurement device because determination may be made by first determining the power loss due to the conduction losses of the IGBT and power loss associated with switching the IGBT where these losses may be determined by utilizing the saturation voltage of the IGBT, IGBT PWM duty cycle, IGBT switching frequency, fundamental frequency along with a lookup table for the switching energies and the phase current going through the IGBT. The determined power loss may be multiplied by a measured, sensed or obtained thermal impedance from the IGBT junction. Finally, the determined temperature rise of the IGBT junction may be added to a measured, sensed or obtained temperature of the coolant in order to determine the absolute temperature of the IGBT junction.