Hysteresis-free electrodynamic transducer with motional impedance rectifying return circuit

Abstract

The invention relates to a hysteresis-free electrodynamic transducer with a motional impedance rectifying return circuit. The electrodynamic transducer can be used for loudspeakers, earphones, sound sensors and the like, and the electrodynamic transducer comprises a movement coil, a disincentive fixed coil, a magnetic circuit and a vibration membrane. The movement coil is located in the center of the magnetic circuit and drives the vibration membrane to produce sound, the disincentive fixed coil is fixed at the appropriate position of the magnetic circuit position, and the disincentive fixed coil is in antiphase connection with the movement coil, and the electrodynamic transducer further comprises the motional impedance rectifying return circuit which is composed of an inductor, a capacitor and a resistor. The hysteresis-free electrodynamic transducer is characterized in that the motional impedance rectifying return circuit composed of the inductor, the capacitor and the resistor rectifies impedance difference of the motional impedance of the movement coil and the impedance of the disincentive fixed coil, motivation energy acted on the magnetic circuit through the movement coil and the disincentive fixed coil mutually drops to the minimum, distortion of the loudspeakers and the earphones caused by loudspeakers and earphones is reduced to the minimum, and sound distortion of the vibration membrane connected with the movement coil is reduced.

Description

technical field [0001] The present invention relates to an electric transducer, in particular to a hysteresis-free electric transducer with a dynamic impedance correction loop for good audio playback effect, and the electric transducer can be used in loudspeakers, earphones and acoustic sensors Wait. Background technique [0002] Audio-visual devices have entered the field of people's lives. These audio-visual devices have electric → sound and sound → electric transducers, such as electric speakers, earphones, and sound sensors. In these devices, the sound-producing diaphragm needs to be driven by a moving coil placed in a magnetic circuit. Since the moving coil will excite the magnetic circuit when it flows through the driving current, the excitation energy of the reciprocating motion of the moving coil will generate a continuous process of storage→release→storage→release in the magnetic circuit, and then react to the moving coil after a period of lag. As a result, the mo...

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Problems solved by technology

Since the moving coil will excite the magnetic circuit when the driving current flows, the excitation energy of the reciprocating motion of the moving coil will produce a continuous storage→release→storage→release process in the magnetic circuit, and then react on the moving coil after a period of time lag. The motion result of the moving coil deviates from the given drive signal, resulting in hysteresis distortion

[0003] As far as the inventors of the present invention know, in order to eliminate the harmful excitation of the moving coil to the magnetic circuit, people have designed the anti-excitation coil, (see Figure 11 ) The anti-excitation coil is fixed at the proper position of the magnetic circuit, and is fed with a driving signal that is opposite in phase and similar in strength to the moving coil, trying to completely eliminate the harmful excitation of the moving coil to the magnetic circuit, but since the anti-excitation coil is stationary, and The moving coil is moving. Due to different working conditions, the equivalent resistance and the current flowing are different in the common working frequency band from 20 cycles to 20,000 cycles, so that the magnetic circuit is still inevitably subject to a considerable degree of harmful excitation. Make the sound distorted at a certain moment in certain frequency bands, affecting the playback quality of the sound

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