公开(公告)号：US20170353104A1

公开(公告)日：2017-12-07

申请号：US15169951

申请日：2016-06-01

Applicant: SENSATA TECHNOLOGIES, INC.

Inventor： Kirk Randall Soldner ,  Gary Neil Johnson

IPC: H02M1/44 ,  H02M3/22

CPC classification number: H02M1/44 ,  H02H9/041 ,  H02M1/32 ,  H02M3/22 ,  H02M3/335 ,  H02M3/33592

Abstract: In electrical systems with DC-DC converters having synchronous rectification (SR) on the output stage, the input voltage can be monitored. When a potentially destructive transient occurs, the SR is rapidly turned on in a non-synchronous manner to “crowbar” the main power transformer. The resulting short circuit is reflected back to the DC input under current-limited pulse width modulation (PWM) control. In effect, the entire surge rating of the power train is applied to the potentially destructive input transient. The clamping capacity can be controlled accurately and is significantly more than what is available in prior art components and systems. When the input voltage is pulled down to safe levels, the clamp circuit disengages and the DC-DC converter returns to normal operation. DC output voltage regulation to the connected load is not maintained during this clamping event, but maintaining output voltage regulation during such destructive transients is not required.

公开(公告)号：US09979279B2

公开(公告)日：2018-05-22

申请号：US15169951

申请日：2016-06-01

Applicant: SENSATA TECHNOLOGIES, INC.

Inventor： Kirk Randall Soldner ,  Gary Neil Johnson

IPC: H02M3/335 ,  H02M1/44 ,  H02M3/22

CPC classification number: H02M1/44 ,  H02H9/041 ,  H02M1/32 ,  H02M3/22 ,  H02M3/335 ,  H02M3/33592

Abstract: In electrical systems with DC-DC converters having synchronous rectification (SR) on the output stage, the input voltage can be monitored. When a potentially destructive transient occurs, the SR is rapidly turned on in a non-synchronous manner to “crowbar” the main power transformer. The resulting short circuit is reflected back to the DC input under current-limited pulse width modulation (PWM) control. In effect, the entire surge rating of the power train is applied to the potentially destructive input transient. The clamping capacity can be controlled accurately and is significantly more than what is available in prior art components and systems. When the input voltage is pulled down to safe levels, the clamp circuit disengages and the DC-DC converter returns to normal operation. DC output voltage regulation to the connected load is not maintained during this clamping event, but maintaining output voltage regulation during such destructive transients is not required.