公开(公告)号：US4868662A

公开(公告)日：1989-09-19

申请号：US244706

申请日：1988-09-15

Applicant: Uwe Hartman ,  Michel van den Driesche ,  Udo Mai ,  Philippe Maige

Inventor： Uwe Hartman ,  Michel van den Driesche ,  Udo Mai ,  Philippe Maige

IPC: H02M3/28 ,  H02M3/335 ,  H04N5/63

CPC classification number: H04N5/63 ,  H02M3/33523 ,  H02M2001/0032 ,  Y02B70/16

Abstract: An external-power stage suitable for use with television sets, for example. A transformer is provided with control circuits in both the primary side and the secondary side. Each of the control circuits have pulse-width modulators which provide pulses to an electronic switch. The control circuit on the primary side provides pulses to that switch of varying pulse width and of sufficient magnitude to maintain the television set in a standby mode. The control circuit in the secondary side of the transformer, on the other hand, comes into operation when the television set is turned on and provides pulses to the electronic switch while operating with the control circuit in the primary side for a predetermined period of time. Thereafter, the control circuit in the secondary side takes over the function of providing pulses to the electronic switch while the control circuit on the primary side is switched to an inoperative stage. The control circuit in the primary side is operative only in the standby mode, whereas the control circuit in the secondary side is operative during the normal mode of operation.

Abstract translation: 例如适用于电视机的外部功率级。 变压器在初级侧和次级侧都设有控制电路。 每个控制电路具有向电子开关提供脉冲的脉宽调制器。 初级侧的控制电路向变化的脉冲宽度的开关提供脉冲并具有足够的幅度以将电视机维持在待机模式。 另一方面，当电视机打开时，变压器次级侧的控制电路进入工作状态，并在初级侧的控制电路工作一段预定的时间期间向电子开关提供脉冲。 此后，次级侧的控制电路在初级侧的控制电路切换到不工作阶段时接管向电子开关提供脉冲的功能。 初级侧的控制电路仅在待机模式下工作，而次级侧的控制电路在正常工作模式下工作。