论文部分内容阅读
彩色电视机中采用的电源电路有两大特点:一是不用电源变压器,对220V交流市电直接整流,这使得线路板的地线(底板)带电,给调试和维修带来不便;二是采用开关型稳压电路,因而电源电路较复杂,同时还附设有多种保护电路,给维修增加了难度。 开关型稳压电路 开关型稳压电路因其开关管工作在饱和和截止(即开关)状态而得名。它按照开关管连接方式可分为串联型、并联型和脉冲变压器耦合型三种类型。在串联型电路中,开关管(还有储能电感)串联在输入电路和负载之间。并联型电路中,开关管与输入电路和负载并联。脉冲变压器耦合型电路中,开关管与脉冲变压器初级串联后并接于输入电压端,负载与脉冲变压器次级并联,此种类型是常见的方式。
There are two characteristics of the power supply circuit used in color TV: First, without the power transformer, 220V AC mains rectifier directly, which makes the circuit board ground (floor) charged, to debug and repair inconvenience; the second is the use of Switching regulator circuit, so the power supply circuit is more complicated, but also attached to a variety of protection circuits, to the maintenance increased difficulty. Switching regulator circuit Switching regulator circuit because of its work in saturation and cut-off (ie, switch) state named. It is in accordance with the switch connection can be divided into series, parallel and pulse transformer coupled three types. In a series circuit, the switch (and energy storage inductor) is connected in series between the input circuit and the load. Parallel circuit, the switch and the input circuit and load in parallel. Pulse transformer coupled circuit, the primary switch and the pulse transformer in series and then connected to the input voltage, the load and pulse transformer secondary parallel, this type is a common way.