公开(公告)号：US20160336861A1

公开(公告)日：2016-11-17

申请号：US14949531

申请日：2015-11-23

Applicant: STMicroelectronics S.R.L.

Inventor： Giovanni Gritti

IPC: H02M3/335

CPC classification number: H02M3/33507 ,  H02M3/33523 ,  H02M2001/0009 ,  H02M2001/0016 ,  H02M2001/0022

Abstract: A control circuit controls a switch of a switching current converter receiving an input quantity, with a transformer having a primary winding and a sensor element generating a sensing signal correlated to a current in the primary winding. The control circuit has a comparator stage configured to compare a reference signal with a comparison signal correlated to the sensing signal and generate an opening signal for the switch. The comparator stage has a comparator element and a delay-compensation circuit. The delay-compensation circuit is configured to generate a compensation signal correlated to the input quantity and to a propagation delay with respect to the opening signal. The comparator element generates the opening signal with an advance correlated to the input quantity and to the propagation delay.

Abstract translation: 控制电路通过具有初级绕组的变压器和产生与初级绕组中的电流相关的感测信号的传感器元件来控制接收输入量的开关电流转换器的开关。 控制电路具有比较器级，其被配置为将参考信号与与感测信号相关的比较信号进行比较，并产生开关的开路信号。 比较器级具有比较器元件和延迟补偿电路。 延迟补偿电路被配置为产生与输入量相关的补偿信号和相对于打开信号的传播延迟。 比较器元件产生具有与输入量相关的提前和传播延迟的开启信号。

公开(公告)号：US20160276936A1

公开(公告)日：2016-09-22

申请号：US14661968

申请日：2015-03-18

Applicant: STMICROELECTRONICS S.R.L.

Inventor： Giovanni Gritti

IPC: H02M3/335 ,  H02M1/42

CPC classification number: H02M1/4258 ,  H02M2001/0009 ,  Y02B70/126

Abstract: The present disclosure is directed to a switching power converter having a power transistor controlled by a controller. The controller includes a multiplier that produces a voltage reference signal. A subtraction circuit subtracts a capacitor signal, which is based on the voltage reference signal, from a sensing signal that is representative of the current flowing through the power transistor. A comparator compares the voltage reference signal to the output of the subtraction circuit, and a driving circuit drives the power transistor based on the comparison resulting in a high power factor and low total harmonic distortion for the converter.

Abstract translation: 本公开涉及具有由控制器控制的功率晶体管的开关功率转换器。 控制器包括产生电压参考信号的乘法器。 减法电路从表示流过功率晶体管的电流的感测信号中减去基于电压参考信号的电容信号。 比较器将电压参考信号与减法电路的输出进行比较，驱动电路根据比较驱动功率晶体管，导致转换器的功率因数高，总谐波失真低。