Self-generating power supply for power circuit breaker

Abstract

The invention provides a kind of autogeny power for a control device. The power can be constructed under to small inductive current, thus the range of the breaker can be enlarged, thus it can work normally even with current which is 50%, even 16% of the normal current. The power includes several current mutual-inductors, switch power, energy-saving capacitance, there adds a first-grade resistance converter between the input end of the switch power and the energy-saving capacitance, it reduces the output resistance of the current mutual-conductor, and thus the inductive current can be outputted fully. The output resistance of the converter is high; it can supply power to the switch and the energy-saving capacitance.

Description

technical field [0001] The invention belongs to the field of electrical appliances, and relates to an electronic detection control device for tripping of a power circuit breaker, in particular to a self-generated power supply of the control device. Background technique [0002] In the electronic release of the power circuit breaker, also known as the electronic controller, the power supply cannot be directly obtained from the relevant power grid, so as to avoid failure to provide normal power to the controller when these power grids fail, causing the controller to fail. For this reason, the controller needs to self-generate and de-induce energy from the fault overcurrent to establish a power supply for itself, which is called self-generated power supply. At the same time, in normal operation, it is also necessary to sense the self-generated power directly from the load of the circuit breaker, that is, the mains current. Because the current intensity at this time is too small...

AI Technical Summary

Problems solved by technology

[0004] When the mains current is small, the induction current of the current transformer is too small to supply power for the switching power supply and the energy storage capacitor. At this time, there is energy, but the input and output impedances of the two do not match, so it is difficult to establish a self-generated power supply.