Electricity-limiting switch

限电开关

Abstract

The utility model belongs to the technical field of emergency protection circuit device, relating to an electricity restricting switch when the load is excessive. The utility model is to solve the problem that: the fluctuation of the network voltage brings the great change of the load power, thus, not only the life span of the lamp is shortened, but also the increasing load on the wire is easily to bring about hazard. The electricity restricting switch comprises a DC power supply circuit(1) and a relay(2); the switch contact of the relay(2) is in series with the primary winding of the mutual inductor(3), and the secondary winding of the mutual inductor(3) is connected with the input end of the differential amplifying circuit(4); the central tap of the secondary winding is earthed; the output end of the differential amplifying circuit(4) and the output end of the voltage reference are respectively connected with the input end of the voltage comparison circuit(5), and the output end of the voltage comparison circuit(5) is connected with the executive circuit(6) of the relay(2). When the current in the load wire excels the set value, the utility model will sensitively detect the change and shut off the circuit.
本实用新型属于紧急保护电路装置技术领域,是一种负载过压超载时的限电开关。解决因电网电压的波动,导致负载功率变大,不但导致灯的使用寿命减小,而且使电线的负荷加大容易产生危险的问题。所述的限电开关包括直流供电电路(1),继电器(2),在所述的继电器(2)的开关触点与互感器(3)的初级绕组串接,互感器(3)的次级绕组接在差分放大电路(4)的输入端,所述的次级绕中心抽头接地,所述的差分放大电路(4)的输出端与基准电压输出端分别接在电压比较电路(5)的输入端,所述的电压比较电路(5)的输出端接所述的继电器(2)的执行电路(6)。在负载线路中的电流变大到超过设定值时,能够灵敏地感应到其变化而切断电路。

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