The new controlling method on current shutdown proposed in this paper can be used in the cooperative work of borehole and ground transmitting system. A square wave is a non-sinusoidal periodic waveform in which the amplitude alternates at a steady frequency between fixed minimum and maximum values, with the same duration at minimum and maximum. The error for shutdown time deduced from the energy consumption is less than 6%. When the rising time is fixed, the shutdown time is unchanged. Experimental results show that adjustment of the current rising time can precisely control the value of the clamp voltage. The duration of each cycle varied from 2 to 6 minutes, which allowed accumulating billions of acoustic signals during the experiment consisted of hundreds of cycles. Since the switch is not ideal, we propose a new method to test the shutdown time by the low voltage, the high voltage and the peak current. In different experiments the bipolar square-wave pulses of 20 V peak-to-peak amplitude were applied with the frequency of 250 Hz or 2.5 kHz, as also the signals of sinusoidal form. From the viewpoint of the circuit energy loss, by taking the high-voltage capacitor bypass resistance and the capacitor of the passive snubber circuit into account, we establish the relationship between the rising time and the shutdown time. We use the rising time to control shutdown time and use low voltage power source to control peak current. Based on clamping voltage technique, we introduce a new controlling method with constant shutdown time. For example, if you would like a trill created by a square wave modulator to speed up and slow down, you would route a second modulator into the first modulator’s frequency control input and perhaps use a triangle waveform for the second modulator. In the past, it was difficult to use the constant clamping voltage technique to realize the synchronized shutdown of currents with different peak values. Bipolar square wave vs unipolar square wave That is exactly what the audio example below is doing.
The key is the bipolar current waves shutdown, concurrently in the inductive load. Cooperative work of multiple magnetic transmitting sources is a new trend in the development of transient electromagnetic system.
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