Capacitive Actuator Drive Circuit Using Single Flyback Transformer
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Solution Overview
Problem
Capacitive actuators require high drive voltages and store significant electrical energy that is not efficiently converted into mechanical output, complicating power electronics design, especially in mobile applications with power or weight constraints, and existing drive circuits often rely on multiple magnetic components that increase cost, weight, and inefficiency.
Innovation Solution
A switching-mode drive circuit using a single magnetic component to generate drive voltages greater than the power supply voltage and recover unused energy from capacitive loads, capable of transferring energy between multiple capacitive loads, reducing the need for multiple magnetic components and enhancing system efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If multiple magnetic components are used in the drive circuit, then energy recovery and voltage amplification can be achieved, but system weight, cost, and complexity increase
Solution Approach 1:
The patent combines multiple magnetic components into a single integrated magnetic component that performs both voltage amplification and energy recovery functions simultaneously. This merging eliminates the need for separate magnetic components, reducing system weight, cost, and complexity while maintaining energy recovery efficiency
Solution Approach 2:
The single magnetic component is designed to perform multiple functions: voltage amplification for driving capacitive actuators and energy recovery from the actuators. This multi-functionality replaces what previously required multiple specialized components, resolving the contradiction between functionality and complexity
2Loss of energy
If multiple magnetic components are used per actuator, then energy recovery is enabled, but system weight and cost increase
Solution Approach 1:
The patent merges multiple magnetic components into one shared magnetic component that serves all capacitive actuators. This single magnetic component handles voltage amplification and energy recovery for multiple actuators, dramatically reducing system weight compared to having individual magnetic components per actuator
3Power
If traditional switching-mode circuits with multiple magnetic components are used, then voltage amplification is achieved, but system cost and dimensions increase
Solution Approach 1:
The patent consolidates multiple magnetic components into a single integrated magnetic component that provides the necessary voltage amplification for capacitive actuators. This merging reduces the physical footprint, component count, and overall circuit dimensions while maintaining the required power amplification 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 circuit efficiently drives multiple capacitive actuators with reduced system weight, cost, and dimensions, maximizing energy recovery and efficiency, particularly suitable for mobile and weight-critical designs by using a flyback transformer to step up voltage and transfer energy between loads.
Implementation Method 1
A switching-mode drive circuit using a single magnetic component to generate drive voltages greater than the power supply voltage
Implementation Method 2
capable of transferring energy between multiple capacitive loads
Data Source
AI summary
A circuit for driving a plurality of capacitive actuators, the circuit having a low-voltage side, a high voltage side and a flyback transformer between the two. The low-voltage side comprises first and second pairs of low-side switches connected in series across an input voltage. The flyback transformer has a primary winding connected to the two pairs of switches. The high-voltage side has a pair of switches connected between the secondary winding of the flyback transformer and a ground and a plurality of capacitive loads and bidirectional switches to connect the loads to the secondary winding of the flyback transformer and a ground.