公开(公告)号：US6088244A

公开(公告)日：2000-07-11

申请号：US437514

申请日：1999-11-10

申请人： Masaki Shioya ,  Hideaki Matsumura ,  Takumi Oe ,  Iwao Nakanishi

发明人： Masaki Shioya ,  Hideaki Matsumura ,  Takumi Oe ,  Iwao Nakanishi

IPC分类号： H02H3/20 ,  H02M1/32 ,  H02M3/28 ,  H02M3/335

CPC分类号： H02M1/32 ,  H02M3/33523 ,  H02M1/36 ,  H02M2001/0006 ,  Y10S323/902

摘要： A switching power supply comprising a main converter that turns ON and OFF a DC current applied to a primary winding of a main transformer by a main switching element and outputs a main output voltage to a secondary circuit by rectifying and smoothing current induced in a secondary winding; an error amplifier generating an error voltage between the main output voltage and a first reference voltage; an over-voltage protection circuit that generates an over-voltage protection signal when the main output voltage exceeds a second reference voltage; a PWM circuit to control a drive signal for the main switching element to minimize error voltage outputted by the error amplifier; and a shut-down execution circuit that stops the main converter operation when the over-voltage protection signal is generated; wherein are provided a device to superimpose the over-voltage protection signal on the error signal of the main output voltage induced in the secondary winding and to transmit the superimposed signal to the primary circuit after isolating the superimposed signal with a photo-coupler; and a primary control circuit that detects an error signal transmitted via the photo-coupler by dividing the error signal into three levels of stop range, normal operation range, and abnormal operation range, and rapidly stop operation of the main converter when the error signal value is deflected to the stop range or the abnormal operation range due to failure of the photo-coupler, thereby resulting in improved reliability of the switching power supply.

摘要翻译： 一种开关电源，包括主转换器，其通过主开关元件接通和断开施加到主变压器的初级绕组的DC电流，并且通过对次级绕组中感应的电流进行整流和平滑化而将主输出电压输出到次级电路 ; 误差放大器，产生主输出电压和第一参考电压之间的误差电压; 当主输出电压超过第二参考电压时产生过电压保护信号的过电压保护电路; PWM电路，用于控制主开关元件的驱动信号，以最小化由误差放大器输出的误差电压; 以及关闭执行电路，其在产生过电压保护信号时停止主转换器动作; 其中提供了一种用于将过电压保护信号叠加在次级绕组中感应的主输出电压的误差信号上的装置，并且在用光耦合器隔离叠加信号之后将叠加的信号发送到初级电路; 以及初级控制电路，其通过将误差信号除以三级停止范围，正常工作范围和异常运行范围来检测通过光电耦合器发送的误差信号，并且当误差信号值 由于光耦合器的故障而偏转到停止范围或异常操作范围，从而提高了开关电源的可靠性。

公开(公告)号：US6023178A

公开(公告)日：2000-02-08

申请号：US50583

申请日：1998-03-30

申请人： Masaki Shioya ,  Hideaki Matsumura ,  Takumi Ooe ,  Iwao Nakanishi ,  Masuo Hanawaka

发明人： Masaki Shioya ,  Hideaki Matsumura ,  Takumi Ooe ,  Iwao Nakanishi ,  Masuo Hanawaka

IPC分类号： H02M3/335 ,  H03K3/017

CPC分类号： H02M3/33523

摘要： A pulse width control IC circuit that greatly reduces price, increases packaging density,and improves reliability for switching power supply units, wherein the IC circuit is on a single chip and includes a main converter control section that controls the ON and OFF actions of a main switch outside the IC, an output MOSFET, and an auxiliary converter control section that controls the ON and OFF actions of the output MOSFET.

摘要翻译： 一种脉冲宽度控制IC电路，其大大降低了价格，提高了封装密度，并提高了开关电源单元的可靠性，其中IC电路在单个芯片上，并且包括主转换器控制部分，其控制主电源的ON和OFF动作 在IC外部切换，输出MOSFET和辅助转换器控制部分，用于控制输出MOSFET的ON和OFF动作。