1, magnetic coupling resonance technology is one of the many wireless energy transmission technologies. It includes magnetically coupled induction withoutLine power transmission, magnetic coupled resonance radio energy transmission and magnetic coupled two-mode radio energy transmission. The theory of magnetic coupling resonance technique is coupling mode. First, the transmitter power conversion circuit is calibrated, chopped, and poured from 380 V AC high frequency AC.
2, the definition of different magnetic coupling resonance is actually inductive coupling, which refers to the phenomenon of close coordination and mutual influence between the input and output of two or more circuit components or electrical networks, and the transmission of energy from one side to the other through interaction.
3, there are four main wireless charging methods: electromagnetic induction chargingElectric, magnetic resonance charging, radio wave charging, electric field coupling, the technical solutions of various charging methods are also different. Electromagnetic induction wireless charging uses the induced magnetic flux generated between the inductive magnet on the power supply side (wireless charging board) and the inductive magnet on the receiving side (mobile phone) to convert the magnetic force into electricity and then transmit it.
4, the other is a resonant type, that is, magnetic resonance. Their wireless charging principle is easy to understand, the essence of electromagnetic induction wireless charging is magnetic generation, and the transformer principle, the sending end and the receiving end have a built-in coil, when the two ends are close, the sending end of the coil into the high-frequency alternating currentd=' Duty cycle and frequency difference '> Duty cycle and frequency difference
1, the two have different meanings and different uses. Duty cycle refers to the ratio of power time to power cycle of the pulse signal iphone wireless charge duty cycle . In an ideal sequence of pulse periods (such as a square wave), the ratio of the duration of the positive pulse to the total period of the pulse.
2, the frequency is related to the period, and the frequency is reciprocal with the period. Pulse width and duty cycle are related to the period. Pulse width is the time occupied by a high level in a cycle, the duty cycle (such asName) is the proportion of the high level in a cycle. For example, iphone wireless Duty cycle : Assuming the frequency is F and the duty cycle is P, pulse width = (1/F) *P.
3, modulation frequency iphone wireless duty cycle : Modulation frequency refers to the frequency change of the optical signal, usually expressed in Hertz (Hz). In optical communication systems, the higher the modulation frequency, the faster the optical signal changes and the longer the transmission distance. Therefore, choosing the right modulation frequency can improve the lightThe distance the signal travels. Duty cycle: The duty cycle refers to the proportion of time spent in the high-level portion of the signal, usually expressed as a percentage.
This situation occurs in an environment where the temperature is extremely low iphone wireless duty cycle , indicating that the closing Angle
Waveform results When the wheel starts to turn iphone wireless duty cycle , the Hall effect sensor begins to produce a series of signals iphone wireless duty cycle , the number of pulses will increase with the increase of the speed, like the legend, This is recorded at about 30 miles per hour, and the speed sensor's pulse frequency will increase as the speed increasesHowever, the duty cycle of the position remains constant at any speed.
Vehicle air intake temperature sensor is damaged, data flow analysis will show that abnormal ultra-low temperature, ultra-low temperature air density is high, will increase the duty ratio of oil pump, resulting in too thick mixture. Sensor short circuit failure, data flow analysis will show that abnormal high temperature, low density of high temperature air, will reduce the duty ratio of oil pump, resulting in too thin mixture.
The output signals are square wave pulse signals, the duty cycle range is 30% ~ 70%, generally 50%, but the high and low voltage of the output signal are different.
Hall biographyThe sensor signal voltage does not increase with the increase of speed, but the frequency will follow.
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1, wireless charging whereHow many components? The left side is TX, that is, the transmitter, and the corresponding product is the wireless charging transmitter. On the right is Rx, that is, the receiving end, and the corresponding product is a mobile phone with wireless charging function. TX end: MCU, power full bridge, and LC resonant Tank composed of inductors and capacitors, where the inductor is the transmitting end coil.
2, there are two kinds of power supply for the radio energy transmission unit: 220V AC and 24V DC (such as automotive power supply), which is selected by relay J. In accordance with the principle of AC priority, the normally closed contact of relay J in the figure is connected to DC (battery BT1). normalThe S3 is in the connected state.
3, this circuit diagram with chip sl1052 as control, simple structure, complete functions. Pin function 1 Power end. 2 Temperature monitoring input. 3 Charging status indicator. 4 Grounding terminal. 5 Adjust the tube driver. With the base of the external regulating tube. 6 Charging control. 7 Current sampling input. The charging current is determined by the voltage difference between the power supply and this pin.
4, electromagnetic induction primary coil of a certain frequency of alternating current, through electromagnetic induction in the secondary coil to produce a certain current, so as to energy from the transmission endTransfer to the receiving end.
5, but the load, the general design is 2 times the U input. The larger the filter capacitance, the higher the output voltage, and the lower the vice versa. In a single-phase bridge rectifier circuit, if there is no filter capacitor, the output voltage is 0.9 times of the AC input voltage when the load is open, that is, U output =0.9*U input. Under load, the formula remains the same: U output =0.9*U input. This conclusion is applicable to both bridge and full wave rectifier circuits.