Controllable Voltage Device Driver for Electro-Optical Systems
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Solution Overview
Problem
Traditional electro-optical device drivers face challenges related to safety, size, frequency limitations, and power consumption, including energy retention issues, large size, limited frequency capabilities, and inefficiency due to continuous power consumption even when not providing output voltage.
Innovation Solution
A controllable voltage device driver system that uses a configuration of device drivers in parallel or series to generate high output voltages efficiently, with inductive means such as transformers, allowing for high switching frequencies and energy efficiency by only generating voltage on demand, reducing the risk of unintended energy discharge.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If capacitive elements are used to store energy in traditional electro-optical device drivers, then the driver can provide stable output voltage, but safety risks increase due to retained energy that may discharge into unintended loads
Solution Approach 1:
The patent removes capacitive energy storage elements from the driver circuitry entirely. Instead of storing energy in capacitors and switching it to the electro-optical device, the system generates voltage only during active switching periods using pulse-width modulation (PWM) control of power MOSFETs in a half-bridge configuration. This extraction of capacitive elements eliminates the retained energy hazard while maintaining voltage stability through active control.
2Adaptability or versatility
If variable voltage electro-optical device drivers are designed to provide adjustable output, then adaptability improves, but device size increases requiring rack-mounted modules
Solution Approach 1:
The patent designs a universal driver architecture using a half-bridge configuration with controllable switches (power MOSFETs) and PWM control that can accommodate both Pockels cells and electro-optical deflectors. The same circuit topology provides fixed voltage for Pockels cells and variable voltage for deflectors, eliminating the need for separate dedicated drivers and reducing overall system size.
Solution Approach 2:
The patent employs pulse-width modulation (PWM) to generate variable output voltages through periodic switching of power MOSFETs. By controlling the duty cycle of the PWM signal, the average output voltage can be precisely adjusted without requiring large variable power supply circuits, thereby maintaining compact dimensions while providing full voltage adjustability.
3Speed
If PWM frequency is increased to improve switching speed, then frequency capability improves, but output voltage droop increases due to limited charging rate of capacitive elements
Solution Approach 1:
The patent replaces the mechanical/electrical charging process of capacitive elements with electronic PWM-controlled voltage generation. Instead of charging capacitors at limited rates and switching them, the system uses high-frequency PWM switching of power MOSFETs to synthesize the output voltage directly. This substitution enables much higher switching frequencies without voltage droop because the voltage is actively regulated during each switching cycle rather than relying on pre-charged capacitor energy.
4Speed
If capacitive elements maintain energy during idle periods, then ready-state performance improves, but power consumption increases continuously
Solution Approach 1:
The patent uses PWM control to generate output voltage only during active periods when the electro-optical device needs to be driven. During idle periods, the PWM switching is stopped and no energy is consumed by the power stage. The system transitions seamlessly between active and idle states by simply adjusting the PWM duty cycle to zero, eliminating continuous power consumption while maintaining rapid response capability when needed.
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 provides a compact, safe, and energy-efficient electro-optical device driver capable of high switching frequencies and efficient power usage, eliminating the need for capacitive elements and their associated safety risks.
Implementation Method 1
a step-up transformer, having a primary winding electrically coupled to the DC voltage source, wherein the transformer is adapted to receive the DC transformer input voltage and to convert the DC transformer input voltage into an AC transformer output voltage
Implementation Method 2
a rectifier, electrically coupled to the step-up transformer, and adapted to rectify the alternating current transformer output voltage to generate the driver output voltage
Implementation Method 3
application of sufficiently a high voltage across the crystal induces birefringence. The induction of birefringence in a crystal is referred to as the 'electro-optical effect'
Data Source
AI summary
Embodiments include controllable voltage device drivers adapted to generate driver output voltages. A device driver includes a direct current (DC) voltage source adapted to receive a voltage level command that indicates a commanded voltage, and to generate a DC transformer input voltage having a voltage level corresponding to the commanded voltage. The device driver also includes a step-up transformer adapted to receive the DC transformer input voltage and to convert the DC transformer input voltage into an alternating current (AC) transformer output voltage. The device driver also includes at least one processing element, adapted to receive one or more control inputs, and to generate an alternating current through a primary transformer winding based on the one or more control inputs. Other embodiments include methods for a controllable voltage device driver to generate a driver output voltage, and optical systems having an electro-optical device and an electro-optical device driver subsystem.