[变频空调维修]-第8章-开关电源电路故障-第8节-集成电路开关电源故障,使用电源模块代替

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第8节 集成电路开关电源故障,使用电源模块代替

集成电路型开关电源是目前最常用的设计形式,特点是内置大功率场效应管及启动振荡电路,稳压电路取样点为次级输出电路直流12V电压。

如图8-48所示,本例选用海信KFR-26GW/11BP室外机主板,设有开关电源电路,次级输出2路电压,一路直流15V为模块供电,另一路直流12V为室外机继电器线圈、反相驱动器、7805等负载供电。

图8-48 海信KFR-26GW/11BP室外机主板

图8-48 海信KFR-26GW/11BP室外机主板

1.安装前的准备工作

拆除故障元器件,并将电源模块输出电压电位器调至初始状态,操作步骤如图8-49所示。

图8-49 准备工作

图8-49 准备工作

 

①拆除元器件。初级侧保留浪涌电压吸收电路,开关振荡集成电路必须拆除。如果开关电源电路只是开关振荡集成电路损坏而其他元器件正常,维修时只将集成电路拆除即可。

②调节输出电压电位器至初始状态。使用一字螺丝刀逆时针调节输出电压电位器至初始状态(电位器共有30圈),这样安装后开关电源输出的电压为最低值。

2.安装引线

安装引线就是将电源模块接入开关电源电路,操作步骤如图8-50所示。

图8-50③处红线安装在开关振荡集成电路内部场效应管漏极(代号为D)的引脚,本机为⑤/⑥/⑦/⑧号引脚,直流300V电压(正极)经开关变压器初级供电绕组输送至电源模块。

图8-50④处为黑线。开关振荡集成电路内部场效应管源极(代号为S)的引脚,直接与直流300V负极相连,本机为①/②号引脚,因此将黑线安装在①号引脚位置,直流300V电压(负极)也输送至电源模块。

图8-50⑤处为灰线。由于灰线应用在彩色电视机的遥控关机电路中,在维修空调器开关电源时将接头做好绝缘,悬空不用。

图8-50 安装引线

图8-50 安装引线

3.调试输出电压

上电开机后,使用万用表直流电压挡测量开关变压器次级直流15V输出端电压,由于安装前将输出电压调节电位器逆时针旋转至初始状态,因此测量得出的直流电压会低于正常值,可使用塑料把的一字螺丝刀顺时针调节电位器,使输出端电压逐步提升至直流15V左右,具体方法可参照上一示例中的“调试输出电压”部分。

4.固定电源模块

将电源模块固定在室外机合适的位置,操作步骤如图8-51所示。

如图8-51左图所示,由于空调器开关电源负载较小,电源模块上场效应开关管不用固定在散热片,但由于散热片与直流300V电压正极相通,因此应做好绝缘,方法是使用胶带将电源模块自带的绝缘垫片粘在外壳上面。

如图8-51右图所示,将电源模块固定在室外机主板合适的位置。本例将其放在开关变压器上面,并用不干胶固定,防止空调器开机后因抖动引起电源模块左右晃动。

图8-51 固定开关电源模块

图8-51 固定开关电源模块


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