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1. 发明公开

EP3907888A1 A CIRCUIT TO TRANSFER A SIGNAL BETWEEN DIFFERENT VOLTAGE DOMAINS AND CORRESPONDING METHOD TO TRANSFER A SIGNAL 有权
公开(公告)号：EP3907888A1
公开(公告)日：2021-11-10
申请号：EP21169736.2
申请日：2021-04-21
申请人： STMicroelectronics S.r.l.
发明人： BOGNANNI, Fabrizio , CAGGEGI, Giovanni , CANTONE, Giuseppe , MARANO, Vincenzo , PULVIRENTI, Francesco
IPC分类号： H03K19/0185 , H03K17/06 , H02M7/5387
摘要： A circuit (21, 22) to transfer a command signal (CS) in a circuit (20) comprising circuit stages which are voltage supplied by different voltage domains (VCC, GND; FS, FG) including
a first voltage domain (VCC, GND) comprising first voltage levels represented by a first voltage supply (VCC) and a first voltage reference (GND), in particular a DC voltage supply and a DC ground, and
a second voltage domain (FS, FG) comprising second voltage levels represented by a second voltage supply (VFS) and a second voltage reference (V FG ), in particular a floating supply and a floating ground, and
said circuit (21, 22) to transfer a signal (CS) operating according to the first voltage domain (VCC, GND) to a stage (HS_DRV, PW1) operating according to the second voltage domain (FS, FG),
said circuit (21, 22) to transfer a command signal (CS) including a logic component (224) operating according to the second voltage domain (FS, FG) logically driving said stage (HS_DRV, PW1), and a level shifting circuit (22; 32; 42) coupled to the second voltage supply (FS) and to the first ground reference (GND),
said level shifting circuit (22; 32; 42) including two paths coupled between said second voltage supply (FS) and to the first ground reference (GND), each including a high voltage transistor (221a, 221b) coupled through a respective resistor (223a, 223b) to the second voltage supply (FS) and through a respective commanded current generator (222a; 222b) to the first ground reference (GND), each path being coupled to a respective input (S,R) of the logic component (224), said commanded current generator (222a; 222b) being commanded by pulse signals (Tp1, Tp2) generated by a pulse generator (225) on the basis of said command signal (CS),
characterized in that
said level shifting circuit (32; 42) includes a negative bootstrap circuit (C1, INV1, INV2, C2, INV3, INV4; Cpump, SINV, FINV, 228, 229) including at least a pump capacitor (C1, C2; Cpump) arranged between the current generators (222a; 222b) and the first ground reference (GND) and configured to shift at a negative voltage said first ground reference (GND) synchronically with the activation of the respective commanded current generator (222a; 222b).

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