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在许多化学试验室中,大多采用国产614系列各型电子交流稳压器与大中型仪器配用,以保证供电电压稳定。在这类稳压器的线路中,用于采集输出电压变化信息的敏感元件2D2P钨丝二极管容易损坏(钨丝烧断),造成稳压器失控,输出电压立即升高到320伏左右。这往往会引起仪器事故,是十分有害的。为解决这个问题,我们在这类电子交流稳压器上增添了一个过压自动保护电路,取得了较好的效果。现以苏州电工仪器厂生产的614-C_3型稳压器(5千瓦)为例,说明此过压自动保护电路的原理,供读者参考。图1中虚线框内为保护电路。在2D2P二极管的灯丝电阻R_(24)上並接一个升压变压器T(我们使用市售的节电变压器,其原12伏输出端作为输入,和R_(24)並
In many chemical laboratories, most of the 614 series made using domestic electronic exchange voltage regulator with medium and large equipment, in order to ensure the supply voltage stability. In this type of voltage regulator circuit, the sensor 2D2P is used to collect the information of the output voltage. The tungsten diode is easy to damage (tungsten wire is blown), causing the regulator to run out of control. The output voltage immediately rises to about 320V. This often leads to instrument accidents and is very harmful. In order to solve this problem, we have added an overvoltage automatic protection circuit to this kind of electronic exchange voltage regulator, and achieved good results. Is the Electrical Equipment Factory in Suzhou 614-C_3-type regulator (5 kW) as an example to illustrate the principle of this over-voltage automatic protection circuit for the reader’s reference. Figure 1 dashed box for the protection circuit. Connect a step-up transformer T to the filament resistor R_ (24) of 2D2P diode (we use a commercial power-saving transformer with its original 12-volt output as input and R_ (24)