Spannungspolaritätserkennung für DCM-/CCM-Grenzerkennung in Gleichspannungswandlern

Details

Veröffentlichungs-Nr.

EP2736156

Aktenzeichen

EP12306464

Anmeldetag

27. November 2012

Veröffentlichung

7. Juli 2021

Erteilung

7. Juli 2021

Rechtsraum

EP

IPC

H02M3/158

Abstract

There is described a circuit and a method of detecting a voltage polarity for the detection of a Continuous Conduction Mode to Discontinuous Conduction Mode boundary of a switched DC-DC converter. There is provided use of a dynamic current mirror to store in a first capacitor (C 1 ) a voltage representative of the conduction voltage (V DS(Æ1) ) of the power switch, at the end of a conduction cycle of said power switch. Also, an auto-zero comparator is used to charge the output voltage of the dynamic current mirror into a second capacitor (C 2 ), during the first phase of operation corresponding to a conduction cycle of the power switch, and to detect the polarity of the conduction voltage (V DS(t=TCLK) ) of the power switch at the end of the first phase of operation of the DC-DC converter, by comparing the voltage stored in the second capacitor during the first phase of operation with the output voltage of the dynamic current mirror in a second phase of operation (Æ 2 ) corresponding to a non-conduction cycle of the power switch.

Anmelder

Firmen

Telefonaktiebolaget LM Ericsson (publ)
OCT Circuit Technologies International Limited
ST-Ericsson SA

Land

🇸🇪 Schweden

Fachgebiete