The partial current mutual inductor
Technical field
The utility model relates to sampling and measures the devices field of alternating current, especially a kind of partial current mutual inductor.
Background technology
Two types of devices are used in general alternating current sampling: one type is the low resistance shunt of pure resistance; Another kind of is current transformer, and current transformer also comprises the current transformer and the hollow coil current transformer of ribbon core coil.Have during the low resistance shunt measuring element of pure resistance that current return and measuring unit are electric can not isolate and poor stability, the weak problem of antijamming capability; There is the problem of non-sinusoidal wave current measurement low precision in the common current mutual inductor, and Super-Current Measurement needs the current transformer of big volume, if the big anti-DC component of electric current, volume greatly increases, and cost is risen, and ammeter is not easy to accomplish miniaturization; Hollow coil current transformer, mainly exist anti-external magnetic field ability weak with input and output than low problem.
The utility model content
The purpose of the utility model is to provide a kind of measuring accuracy high for the deficiency that solves above-mentioned technology, anti-DC component and the strong branch current transformer of anti-external interference ability.
In order to achieve the above object, the partial current mutual inductor that the utility model designed, it mainly comprises shunt, mutual inductor and fixed mount; Be connected with power supply at the shunt two ends; Be connected with manganese-copper filament between two ports on the shunt, manganese-copper filament and mutual inductor coupling are provided with, and shunt and mutual inductor all are fixed on the fixed mount; The two ends of mutual inductor are provided with the current sample output terminal, between the current sample output terminal, are provided with resistance.It is loosening that this structure can make mutual inductor and manganese-copper filament structure more firmly be difficult for, and is difficult for breaking down, and makes and improve the precision of measuring, and strengthened stability.
In order to increase the antijamming capability of mutual inductor, described mutual inductor is made up of coil and iron core.
Resulting minute current transformer of the utility model; The setting of shunt and manganese-copper filament; This structure weakens the interference and the raising DC component in magnetic field to external world greatly, can the magnetic field of inside not exerted an influence, and makes stable output signal; Mutual inductor is made up of coil and iron core, has improved the antijamming capability of mutual inductor.Because the shunting between shunt and the manganese-copper filament is come current return and measuring unit electrical isolation, and is safe; Big its antijamming capability that increased of current ratio gap; Also improved the range of linearity and the measuring accuracy measured, and volume can dwindle, thereby reduce cost.
Description of drawings
Fig. 1 is the structural representation of the utility model.
Embodiment
Combine accompanying drawing that the utility model is done further to describe through embodiment below.
Embodiment 1:
Partial current mutual inductor as shown in Figure 1, that present embodiment is described, it mainly comprises shunt 2, mutual inductor 7 and fixed mount 4; Be connected with power supply 1 at shunt 2 two ends, be connected with manganese-copper filament 3 between two ports on the shunt 2, manganese-copper filament 3 is provided with mutual inductor 7 couplings; Shunt 2 all is fixed on the fixed mount 4 with mutual inductor 7; The two ends of mutual inductor 7 are provided with current sample output terminal 6, are provided with resistance 5 between the current sample output terminal 6, and mutual inductor 7 is made up of coil 9 and iron core 8.