Full-Bridge Piezoelectric Driving Circuit Without Inductors
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Solution Overview
Problem
Conventional driving circuits for piezoelectric loads are bulky due to the presence of numerous inductors, making them difficult to integrate into chips, which hinders circuit integration and increases volume.
Innovation Solution
A driving circuit comprising a power stage circuit and a full-bridge circuit, where the full-bridge circuit is controlled to generate supply voltage signals corresponding to a reference voltage during specific intervals, eliminating the need for inductors and enabling compact design for integration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional driving circuits use numerous inductors to drive piezoelectric loads, then the driving capability is sufficient, but the volume becomes large and circuit integration becomes difficult
Solution Approach 1:
The patent extracts and removes the inductor component from the driving circuit. By using a full-bridge circuit configuration with four switching tubes instead of traditional inductor-based topologies, the design eliminates the bulky inductor while maintaining the ability to drive piezoelectric loads effectively, thereby reducing overall circuit volume and improving integrability.
Solution Approach 2:
The patent substitutes the magnetic field-based inductor component with an electronic switching-based full-bridge circuit. This replacement uses electronic switching tubes and capacitive energy storage to achieve the same energy transfer function, transitioning from a magnetic field mechanism to an electronic field mechanism, which enables compact integration.
2Adaptability or versatility
If conventional driving circuits include many inductors, then the driving function is complete, but the device complexity increases
Solution Approach 1:
The full-bridge circuit configuration provides multi-functionality by being able to charge and discharge the piezoelectric load in both forward and reverse directions. The same circuit topology can drive multiple piezoelectric loads simultaneously, reducing the need for separate dedicated circuits for each function, thereby simplifying overall device complexity while maintaining comprehensive driving capabilities.
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
The solution reduces the volume of the driving circuit, facilitates easier integration, and allows for efficient driving of multiple piezoelectric loads while maintaining effective voltage control, thereby improving power density and reducing costs.
Implementation Method 1
As a piezoelectric load or a piezoelectric actuator, a piezoelectric ceramic is increasingly widely used. The piezoelectric ceramic can convert electrical energy into mechanical energy.
Data Source
AI summary
A driving circuit and a driving method are provided. The driving circuit includes a power stage circuit and a full-bridge circuit. The power stage circuit is configured to receive an input voltage, and generate an output voltage at an output port of the power stage circuit. The full-bridge circuit is coupled to the output port of the power stage circuit and is configured to perform charging and discharging on a piezoelectric load. An operating mode of the full-bridge circuit is controlled, so that a supply voltage signal for driving the piezoelectric load during a first operating interval of an operating cycle corresponds to a reference voltage in a first interval, and the supply voltage signal during a second operating interval of the operating cycle corresponds to the reference voltage in a second interval. The driving circuit has a small volume, which is conducive to circuit integration.