Piezoelectric Driving Circuit Peak Current Reduction
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Solution Overview
Problem
Piezoelectric driving circuits face challenges in reducing peak current, which affects efficiency and power consumption, especially when switching elements change the voltage direction, leading to increased peak currents.
Innovation Solution
A piezoelectric driving method and circuit that utilize a sensing resistor to adjust the fire angle and duty cycle of switching switches, aiming to reduce the peak sense voltage, thereby minimizing peak current by optimizing the switching operation close to zero-voltage switching (ZVS) conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If switching elements of the full-bridge driving circuit perform switching operation to change voltage direction, then the piezoelectric circuit can be driven, but a peak current charging the capacitor is generated
Solution Approach 1:
The patent dynamically adjusts the firing angle and duty cycle of the switching elements based on real-time detection of sense voltage peaks. By making the switching parameters variable rather than fixed, the system optimizes the voltage transition timing to minimize peak current while maintaining effective piezoelectric circuit operation.
Solution Approach 2:
The patent employs a feedback mechanism where the sense voltage generated by the sensing resistor is continuously monitored. The peak detection circuit identifies voltage peaks, and this information feeds back to adjust the firing angle and duty cycle of the switching elements, creating a closed-loop control system that reduces peak current through iterative optimization.
2Productivity
If the direction of voltage supplied to the piezoelectric circuit is changed frequently, then the piezoelectric circuit can be effectively driven, but peak current is increased
Solution Approach 1:
The patent changes the operational parameters (firing angle and duty cycle) of the switching elements to optimize performance. By adjusting these parameters based on detected peak conditions, the system reduces energy loss during voltage direction changes while maintaining effective piezoelectric circuit operation.
Solution Approach 2:
The patent performs preliminary detection of sense voltage peaks before executing switching operations. By identifying peak conditions in advance and adjusting switching parameters proactively, the system prevents excessive peak current generation while maintaining productive piezoelectric circuit operation.
3Ease of operation
If conventional full-bridge driving circuit is used, then the piezoelectric circuit can be driven, but switching loss is increased
Solution Approach 1:
The patent uses feedback from peak detection of sense voltage to dynamically adjust switching parameters. This closed-loop control optimizes switching timing to minimize switching loss while maintaining the ability to drive the piezoelectric circuit effectively.
Solution Approach 2:
The patent transforms the static switching parameters of the conventional full-bridge circuit into dynamic, adjustable parameters. By continuously adapting the firing angle and duty cycle based on real-time conditions, the system reduces switching loss while preserving circuit driving capability.
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 method effectively reduces peak current, enhancing efficiency and reducing power consumption by adjusting the fire angle and duty cycle to minimize peak sense voltage, achieving quasi-ZVS or ZVS, which decreases switching loss and input power requirements.
Implementation Method 1
a sensing resistor for sensing a current flowing in the piezoelectric circuit
Implementation Method 2
A piezoelectric circuit may convert electrical energy into mechanical energy or mechanical energy into electrical energy
Data Source
AI summary
A piezoelectric driving circuit and a driving method thereof are provided. The piezoelectric driving circuit drives a piezoelectric circuit by using a first driving switch connected to one end of a piezoelectric circuit, a second driving switch corresponding to the first driving switch and connected to the other end of the piezoelectric circuit, and a sensing resistor for sensing a current flowing in the piezoelectric circuit. A fire angle and a duty cycle of an upper switch are adjusted such that a peak of a sense voltage generated in the sensing resistor at a timing at which the first driving switch is turned on, in a state in which the second driving switch is turned on.