Vibrating-Element Driving Circuit Resonant Frequency Optimization
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Solution Overview
Problem
Existing vibrating-element driving circuits using transformers and coils face inefficiencies in voltage stepping up, leading to high power consumption and harmonic distortion, which affects the accuracy and efficiency of vibration-type actuators used in applications like autofocus driving in cameras.
Innovation Solution
Adjusting the electric resonance frequency by using smaller inductance values for transformers and coils, ensuring a sinusoidal driving waveform with reduced harmonic distortion, and optimizing the transformer's coupling factor to minimize magnetic noise and power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a transformer with larger inductance is used to step up voltage, then the driving voltage can be increased, but power consumption increases and harmonic distortion occurs
Solution Approach 1:
The patent changes the inductance parameter of the transformer to a specific small value (L2 ≤ 100 μH) to optimize the resonant frequency. By adjusting this parameter, the system achieves efficient voltage stepping up at the resonant frequency without excessive power consumption or harmonic distortion, resolving the contradiction between obtaining sufficient driving voltage and minimizing energy loss.
Solution Approach 2:
The patent utilizes periodic resonant oscillation by tuning the transformer and coil to operate at their resonant frequency. This periodic action allows the system to build up voltage efficiently through constructive interference of oscillations, achieving high driving voltage with minimal continuous power input, thus reducing overall power consumption while avoiding harmonic distortion.
2Power
If a coil with larger inductance is used to step up voltage, then the driving voltage can be increased, but harmonic distortion increases
Solution Approach 1:
The patent specifies a small inductance value for the coil (L1 ≤ 10 μH) to tune the resonant frequency of the LC circuit. This parameter change ensures that the system operates at a frequency where voltage stepping up is efficient while minimizing the generation of harmonic distortion, thus achieving clean sinusoidal output voltage.
Solution Approach 2:
The patent replaces traditional mechanical voltage regulation methods with an electrical resonant oscillation system. By using the resonant properties of the LC circuit (inductor and capacitor), the system achieves voltage amplification through electrical oscillation rather than mechanical means, which inherently reduces harmonic distortion and improves waveform purity.
3Speed
If resonance frequency is increased to improve positioning speed, then the actuator responds faster, but power consumption increases
Solution Approach 1:
The patent utilizes periodic resonant oscillation at an optimized frequency to drive the actuator. By operating at the resonant frequency of the LC circuit, the system achieves maximum amplitude response with minimum energy input. This periodic resonant action enables fast positioning speed while minimizing continuous power consumption, as the system leverages the natural oscillation rather than forcing motion against impedance.
Solution Approach 2:
The patent optimizes the resonant frequency by adjusting the inductance and capacitance parameters to achieve a balance between positioning speed and power consumption. The specific parameter values (L1 ≤ 10 μH, L2 ≤ 100 μH) are chosen to set the resonant frequency at an optimal point that provides sufficiently fast response while maintaining efficient energy transfer, thus resolving the contradiction between speed and energy loss.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach results in a low-power-consumption vibrating-element driving circuit with improved efficiency, reduced harmonic distortion, and enhanced control performance for vibration-type actuators, enabling precise positioning and reduced spurious vibrations.
Implementation Method 1
a high-frequency vibration in an electro-mechanical energy conversion element connected to an elastic element by applying an alternating voltage to the electro-mechanical energy conversion element
Implementation Method 2
The driving circuit has a function of stepping up a rectangular wave signal input from the pulse generator by a factor of several to several tens by using a coil, a transformer
Implementation Method 3
The driving circuit using the coil is an LC step-up circuit configured to electrically amplifying a signal with a particular frequency by using LC resonance of inductance of a coil and capacitance of the piezoelectric element
Data Source
AI summary
In a vibrating-element driving circuit including a transformer and a coil as elements for stepping up a voltage, an improvement in a circuit efficiency of the driving circuit is achieved. The vibrating-element driving circuit includes a transformer, and an inductor connected to a primary side of the transformer, wherein an alternating voltage is applied to a primary winding coil of the transformer, an electro-mechanical energy conversion element of the vibration-type actuator is connected in parallel to a secondary winding coil of the transformer, the inductor is connected in series to the primary winding coil of the transformer, and wherein when the inductance of the inductor is Le1, the inductance of the primary winding coil of the transformer is L1, and Ka=L1/Le1, then the following is satisfied: 1≤Ka≤10.