Magnetic modulation oscillation circuit and driving method thereof
An oscillating circuit and magnetic modulation technology, applied in circuit devices, emergency protection circuit devices, electrical components, etc., can solve problems such as difficulty in accurately controlling the polarity change of driving signals
Pending Publication Date: 2022-01-25
SHANGHAI FUDAN MICROELECTRONICS GROUP
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Problems solved by technology
However, during the dynamic change of the working state, it is difficult to precisely control the polarity change of the driving signal
Method used
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[0026] Existing magnetic modulation technology picks up the current on the coil and changes the polarity of the drive signal when it equals or exceeds a threshold, so that the magnetic ring is magnetized in the opposite direction. However, when the current is collected and the value of the current is compared with the threshold value, the driving signal in the coil and the magnetic field induced in the magnetic ring are still changing, so that the polarity change moment of the driving signal determined based on the threshold value comparison It is inconsistent with the moment when the magnetic ring enters the magnetic saturation state from the non-magnetic saturation state.
[0027] In the embodiment of the present invention, considering the changing law of the current in the coil wound on the magnetic ring, that is, under the drive of the drive circuit, the magnetic ring runs periodically along the hysteresis loop, when the magnetic ring When gradually running to a magnetic s...
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The embodiment of the invention provides a magnetic modulation oscillation circuit and a driving method thereof. The magnetic modulation oscillation circuit comprises a magnetic ring; at least one coil wound on the magnetic ring; a sampling circuit connected to the at least one coil and outputting a sampling signal; a differentiator which is connected with the sampling circuit and outputs a differential signal; a comparator connected to the differentiator and outputting a comparison result signal based on a comparison between the differential signal and a preset threshold; a pulse shielding circuit which is connected with the comparator, outputs a driving control signal and keeps the driving control signal unchanged within a preset duration after the comparison result signal is changed; and a driving circuit which is connected with the pulse shielding circuit to receive the driving control signal and drive at least one coil to generate an oscillation signal. According to the technical scheme provided by the embodiment of the invention, the driving circuit of the magnetic modulation oscillation circuit can be accurately controlled, so that the moment of the polarity change point of the driving signal is basically consistent with the moment of the critical point of the magnetic ring entering the magnetic saturation state from the non-magnetic saturation state.
Description
technical field [0001] The invention relates to the field of current protection, in particular to a magnetic modulation oscillation circuit and a driving method thereof. Background technique [0002] In an AC or DC power supply system, magnetic modulation technology can be used to detect the current in the power supply line, for example, to detect the residual current in the AC power supply line; when the residual current is detected to be greater than the set threshold, the power supply line and the load will be disconnected connection, so as to realize the protection of load and personal. [0003] The polarity of the driving signal can be alternately changed by changing the polarity of the power supply (such as a voltage source, a current source), and the coil receives the driving signal so that the working state of the magnetic ring wound by it also changes alternately. However, it is difficult to precisely control the polarity change of the driving signal during the dyn...
Claims
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IPC IPC(8): H02H3/32G01R19/165G01R15/18
CPCH02H3/32G01R19/16571G01R15/181
Inventor 郝树森刘阳马骏
Owner SHANGHAI FUDAN MICROELECTRONICS GROUP