Power supply device of current transformer
A technology of current transformers and power supply devices, applied in circuit devices, emergency protection circuit devices for limiting overcurrent/overvoltage, emergency protection circuit devices, etc., to reduce costs, improve conversion efficiency, and ensure reliability.
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[0055] Such as figure 1 As shown, the device proposed by the present invention consists of a current transformer (CT) 1, a first bridge rectifier circuit 2, an input peak voltage suppression circuit 12, a residual current discharge switch 3, a diode 4, an LC filter circuit 5, Input voltage sampling circuit 6, bias power supply 7, reference voltage forming circuit 8, hysteresis comparison circuit 9, drive circuit 10, isolated high-frequency switch pulse width modulation DC / DC conversion multiple output regulated power supply circuit 11, AC input It is composed of a protection circuit 13, a power filter 14, and a second bridge rectifier circuit 15.
[0056]Among them, the single line of the high-voltage current loop passes through the CT. When the current Ip flows through the high-voltage loop, a current Is will be generated in the coil on the secondary side of the CT. Is≈Ip / N, N is the transformation ratio of the CT, and the current flows The circuit after the CT is converted ...
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