1, resonance is the phenomenon that the amplitude increases sharply when the external force acting frequency is the same or very close to the natural oscillation frequency of the system. In an AC circuit with resistance R, inductor L and capacitor C components, the voltage at both ends of the circuit is generally different from the current phase in it. If the parameters of the circuit elements (L or C) or the power supply frequency are adjusted, they can be made to be in the same phase, and the entire circuit appears to be purely resistive.
2, resonance, is in the circuitWhere Z=R j (XL-xc), when XL==Xc, and Z is purely resistive, we believe that resonance has occurred.
3, resonance in the circuit: Phenomenon, understanding and processing Resonance in the circuit, like harmony in music, is a special kind of current behavior, especially in the interaction of electronic components. When inductors and capacitors are combined at a specific ratio, a resonance is formed, a phenomenon that is not uncommon in engineering practice, and it may bring unexpected effects, or it may hide potential problems.
4, resonance and detuning are respectively: resonance: also known as "resonance". vibrationWhen the frequency of the external force is the same or very close to the natural oscillation frequency of the system, the amplitude of the oscillating system increases sharply under the action of periodic external force. The frequency at which the resonance is generated is called the "resonant frequency". In electrical technology, the resonance phenomenon of an oscillating circuit.
1, series resonance resistance is minimum wireless charging series resonance , equal to R, circuit current is maximum wireless charging series resonance ; Parallel resonance timeThe resistance is close to the maximum, equal to L/CR, and the voltage at both ends of the loop is the maximum. Deviation from the wireless charging series resonance resonance point, each quantity is changed according to the general curve, only the variables indicated by the ordinate are different.
2, ~60Hz this frequency affects the spatial sense of timbre, this is because the pitch of the musical tone is mostly above this frequency. This frequency is the resonant frequency of the room or hall. If this frequency is sufficiently expressed, it will give people a feeling of being in the hall; If this frequency is absent, the tone becomes empty; And if this frequencyThe characteristic of ong> is that the circuit is pure resistive wireless charging series resonance , the terminal voltage and the total current are in phase wireless charging series resonance , at this time the impedance is minimum, the current is maximum, and the inductance and capacitance may produce a high voltage many times larger than the power supply voltage. In power engineering, due to the series resonance will appear overvoltage, high current, resulting in damage to electrical equipment, so to avoid series resonance.
Series resonance characteristics: the circuit is purely resistive, the terminal voltage and the total current are in phase, at this time the impedance is the smallest, the current is the largestHigh voltages can be generated on inductors and capacitors that are many times greater than the supply voltage. Series resonance is a circuit property. It is also a series resonance test device. The series resonance test device is divided into frequency-modulated type and modulated type. It is generally composed of variable frequency power supply, excitation transformer, reactor and capacitance divider.
Series resonance means that in a circuit, inductors, capacitors and resistors are connected in series to form a resonant loop. Series resonance experimental device It has the following characteristics: Shared current: In a series resonant circuit, inductors, capacitors and resistors are connected in series, so they share the same current. Electric currentIt is continuous throughout the circuit, and the sum of inductors, capacitors and resistors is constant.
2, the essence of resonance is that the electric field energy in the capacitor and the magnetic field in the inductor can be converted to each other, which increases and decreases, full compensation. The sum of electric field energy and magnetic field energy remains unchanged at all times, and the power supply does not have to convert energy with the capacitor or inductor, but only needs to supply the electrical energy consumed by the resistance in the circuit. Resonant circuits are widely used in radio and television technology. All kinds of radio devices, equipment, measuring instruments, etc. are indispensable resonant circuits.
3, series LC resonant circuit principle: In the series LC circuit configuration, the capacitor "℃" and the inductor "L" are connected in series, as shown in the following figure. The sum of the voltages at both ends of the capacitor and the inductor is simply the sum of the entire voltages at the open terminal. LC circuit VeThe current in the terminal is equal to the current through the inductor (L) and the capacitor (C), namely: V=VL vC, i=iL =iC When the "XL" inductive amplitude increases, the frequency will also increase.
1, the circuit resonance condition is Xc=Xl, that is, ωL=1/ωC, it can be obtained that the inherent resonance condition of the circuit is f0=1/ (2π√LC). BR impedance condition: After resonance, the imaginary part is equal and the sign is opposite. The series impedance is equal to 0 and the parallel impedance is equal to infinity. exactlyWhen resonant, the resonant current of the series circuit is infinite; The parallel circuit resonance voltage is infinite (theoretical value).
2, in the series circuit composed of resistance, inductance and capacitance, when the capacitive reactance XC= inductive reactance XL is equal, that is, series resonance occurs, and the phase of the voltage U in the circuit is the same as the current I. When the circuit is resonant in series, the impedance of the circuit Z=√R2 XC-XL2=R, the total impedance in the circuit is minimum, and the current will reach the maximum. Series resonance is a circuit property. It is also a series resonance test device. The series resonance test device is divided into frequency-modulated type and modulated type.
3, in the series circuit composed of resistance, inductance and capacitance, when the capacitive reactance XC is equal to the inductive reactance XL, that is, XC=XL, the phase of the voltage u in the circuit and the current i is the same, the circuit presents resistance, this phenomenon is called series resonance. When the circuit resonates in series, the impedance of the circuit Z=√R^2 (XC-XL) ^2=R, the total impedance in the circuit is minimum, and the current will reach the maximum. The series resonance test device is divided into frequency-modulated type and modulated type.
4, due to the energy loss in the circuit conductor and coil conductor, the leakage in the capacitor and resonant damping. The actual resonant circuit(where resonant conditions exist) are always used with external resonant sources (generators, AC networks, radio signals).
5, the condition of series resonance of RLC circuit is: signal source frequency = RLC series natural frequency; Or the imaginary part of the complex impedance = 0, that is, ωL - 1/ωC = 0, which is derived from ω= 1/√LC, which is the natural frequency of the RLC series circuit.