The starting ability of the power of intermediate frequency is the most important performance index, quality and usability of its quality direct influence apparatus. So, it has focal point and difficult point that has studied in the industry to start the problem all the time, people adopt various methods to improve starting ability, for instance:
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Charge and start the law, the self-excited law starts the law, separate excitation to rotate in parallel, magnetize and start the law etc. in advance, these methods have improved starting ability to a certain extent, but these traditional initialization modes are stored in circuit complicatedness, cost great, higher shortcoming of failure rate. In order to reduce the equipment cost, optimize and simplify the device structure, find out a brand-new initialization mode in engineering practice -Zero pressure is started. This text explains its structural principle. It was a brand-new initialization mode that zero pressure was started, it has not increased any auxiliary apparatus extraly, the circuit is succinct, low cost, examined by long-term production practices, its starting ability is very superior. Fig. 1 reverses the schematic diagram of the main circuit, L0 starts the magnetic ring, TA is a current transformer, TV is a potential transformer, offer for backfeed loop and measure the electric current and measure the voltage signal respectively. Fig. 2 is the schematic diagram of the backfeed loop, T isolates the voltage transformer, RP adjusts the potentiometer against the variable angle, VDl-VD4 is the antiparallel diode. Zero pressure it starts to be to utilize undesired signal make it blow, shake not to support LC, produce self-excited oscillation, the backfeed loop catches the self-excited signal, the controlling circuit...
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The circuit described here uses ultrasonic oscillations and operates based on the propagation velocity of these oscillations in the air. Thus, we can easily determine the distance of two points if the time within which the wave travels this distance is....
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The principle behind a metal detector is really very simple. Proof of this is the circuit that follows, in which it proves that the construction of a metal detector can be done in the minute, with few components that we find very easily everywhere. With the....
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This Amplifier was designed to have the following specifications: Distortion less than 0.1% at full power of 100W even at 20KHz. Power has to be attributed to an extended bandwidth. The output transistors must be protected against short circuits. The power....
A series of LEDs serve to alert the gardener when plants need water. Using two conventional digital integrated LEDs and a series of LEDs, we make a very useful device for gardening. The device detects the amount of water in the pot and alerts the grower.....
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