公开(公告)号：EP0993105A1

公开(公告)日：2000-04-12

申请号：EP98830591.8

申请日：1998-10-07

Applicant: STMicroelectronics S.r.l.

Inventor： Lionetto, Antonio ,  Occhipinti, Luigi ,  Spampinato, Sergio Tommaso ,  Caponetto, Riccardo

IPC: H02M3/335

CPC classification number: H02M1/36 ,  H02M3/33523 ,  H02M2001/0032 ,  Y02B70/16

Abstract: A method of controlling a flyback DC-DC converter, self-oscillating at steady state conditions, employing a transformer for storing and transferring energy to a load and having an auxiliary winding whose voltage, induced by the current flowing in the secondary winding of the transformer, is monitored to regulate the amount of energy being transferred by way of a primary control loop disabling and enabling the turning on of a power switch driving the primary winding of the transformer and to detect its the zero-crossing and consequently turn on the power switch for a new conduction and energy storage phase, the duration (T ON ) of which is established by a secondary control loop of the output voltage producing the turning off of the power switch for a new off phase (T OFF ), and comprising a fixed frequency oscillator of a frequency lower than the self-oscillating frequency of the converter for start-up charge transient of an output filter capacitor, wherein the power transferred from the primary circuit to the secondary circuit of the flyback transformer is controlled by introducing a delay on the turn-on instant of the power switch in respect to a turn-on command generated, during a self-oscillating functioning phase upon sensing a zero crossing event and during a fixed frequency functioning phase, upon a rising front of the signal generated by said oscillator, in function of input variables of the enabling-disabling primary control loop and of the secondary control loop, regardless of the mode of control.

Abstract translation: 一种控制反激DC-DC转换器的方法，在稳态条件下自激振荡，采用变压器存储能量并将能量传递给负载，并具有辅助绕组，该辅助绕组的电压由流过变压器次级绕组的电流 被监控以调节通过主控制回路传输的能量的数量，从而禁用并启用驱动变压器的初级绕组的功率开关的导通并检测其过零点并因此导通功率开关 对于新的导通和储能阶段，其持续时间（TON）由输出电压的次级控制回路建立，产生关断新功率开关（TOFF）的功率开关，并且包括固定频率振荡器 的频率低于转换器的自激振荡频率以用于输出滤波电容器的启动充电瞬变，其中从p 回扫变压器的次级电路中的初级电路通过在功率开关的导通时刻相对于产生的导通命令在自激振荡功能阶段期间在感测到过零事件时引入延迟并且 在固定频率功能阶段期间，根据所述振荡器产生的信号的上升沿，根据所述启用禁用主控制回路和所述次级控制回路的输入变量，而不管所述控制模式如何。

公开(公告)号：EP0993105B1

公开(公告)日：2003-01-08

申请号：EP98830591.8

申请日：1998-10-07

Applicant: STMicroelectronics S.r.l.

Inventor： Lionetto, Antonio ,  Occhipinti, Luigi ,  Spampinato, Sergio Tommaso ,  Caponetto, Riccardo

IPC: H02M3/335

CPC classification number: H02M1/36 ,  H02M3/33523 ,  H02M2001/0032 ,  Y02B70/16