公开(公告)号：EP2302776A1

公开(公告)日：2011-03-30

申请号：EP10179241.4

申请日：2010-09-24

Applicant: STMicroelectronics S.r.l.

Inventor： Santoro, Christian Leone ,  Novelli, Aldo Vittorio ,  Adragna, Claudio

IPC: H02M3/337 ,  H02M1/08 ,  H02M1/38

CPC classification number: H02M3/337 ,  H02M1/083 ,  H02M1/38 ,  H02M2001/0058 ,  Y02B70/1491

Abstract: There is described a detecting device for the midpoint voltage (Va) of a half bridge circuit of transistors (M1, M2) comprising first (M1) and second (M2) transistors; the half bridge is connected between a voltage supply (Vcc) and a reference voltage (GND) and it is adapted to drive a load (LOAD). The first and second transistors are driven so that said midpoint voltage (Va) undergoes transitions from a low voltage value (LW) to a high voltage value (HW) and vice versa; the circuit comprises a bootstrap capacitor (Cboot) having one terminal connected to the midpoint node and the other terminal connected to a supply circuit (15) of said bootstrap capacitor. The detecting device comprises a further capacitor (Cgd) adapted to be connected between said other terminal of the bootstrap capacitor and circuit means (12, Cpump) adapted to form a low impedance node for the current signal (Isink, Isource) circulating in said further capacitor (Cgd) during the transitions from the low value to the high value and from the high value to the low value of the midpoint voltage (Va). The device comprises detecting means (10) adapted to detect said current signal circulating in said further capacitor and adapted to output at least a first signal (HL_comm, LH_comm) indicating the transitions from the low value to the high value or from the high value to the low value of the midpoint voltage according to said current signal.

Abstract translation: 描述了包括第一（M1）和第二（M2）晶体管的晶体管（M1，M2）的半桥电路的中点电压（Va）的检测装置; 半桥连接在电源（Vcc）和参考电压（GND）之间，适用于驱动负载（LOAD）。 驱动第一和第二晶体管，使得所述中点电压（Va）经历从低电压值（LW）到高电压值（HW）的转变，反之亦然; 该电路包括一个自举电容器（Cboot），其具有连接到中点节点的一个端子，而另一个端子连接到所述自举电容器的电源电路（15）。 检测装置包括适于连接在自举电容器的所述另一端和电路装置（12，Cpump）之间的另外的电容器（Cgd），电路装置适于形成用于在所述另外的电路中循环的电流信号（Isink，Isource）的低阻抗节点 在从低值到高电平的转变期间的电容器（Cgd）和从中间点电压（Va）的高值转换到低电平。 该装置包括检测装置（10），其适于检测在所述另外的电容器中循环的所述电流信号，并且适于至少输出一个第一信号（HL_comm，LH_comm），该第一信号指示从低值到高值或从高值到 根据所述电流信号的中点电压的低值。