Vehicle V2L Converter Burst Control for Overload Protection
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Solution Overview
Problem
Existing V2L converters face issues with overload operations, requiring high-specification FETs and additional circuits to prevent damage, leading to increased costs and potential element damage.
Innovation Solution
A V2L converter with a burst circuit that limits output current by adjusting switching operations per unit time, using a comparator and logic gate to control FETs, preventing overcurrent through pulse width modulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If high-specification FETs and additional circuits are used to handle overload operations, then the reliability of the V2L converter is improved, but the device complexity and manufacturing cost increase
Solution Approach 1:
The patent applies periodic action through burst mode operation, where the FETs are switched on and off in periodic cycles during overload conditions. The control unit reduces the switching frequency below the resonant frequency, creating periodic bursts of power transfer that prevent sustained overcurrent while maintaining basic functionality. This periodic switching pattern protects the FETs from damage without requiring additional protective circuits.
Solution Approach 2:
The patent utilizes parameter changes by dynamically adjusting the switching frequency of the FETs based on load conditions. During normal operation, the system operates at resonant frequency for efficient power transfer. When overload is detected, the control unit changes the frequency parameter to below-resonant burst mode, automatically adapting the system behavior to protect components without adding complexity.
2Reliability
If high-specification FETs are used to handle overload operations, then the reliability is improved, but the manufacturing cost increases
Solution Approach 1:
The patent uses parameter changes in the form of dynamic frequency control to protect standard-specification FETs from overload damage. By changing the operating frequency to burst mode below resonance during overload conditions, the system prevents excessive current stress on the FETs, allowing the use of lower-cost, standard-specification components instead of expensive high-specification FETs.
Solution Approach 2:
The system implements self-service through automatic overload protection using the existing FETs and control unit. The control unit monitors load conditions and automatically switches to burst mode when overload is detected, providing self-protection without requiring external protective circuits or specialized components. This self-regulating mechanism eliminates the need for additional protective hardware.
3Reliability
If additional circuits are added to control overload operations, then the reliability is improved, but the device complexity increases
Solution Approach 1:
The patent applies universality by making the existing control unit perform multiple functions: normal power transfer control, overload detection, frequency adjustment, and burst mode activation. The same control unit that manages regular inverter operation also handles overload protection, eliminating the need for separate protective circuits and reducing overall system complexity.
Solution Approach 2:
The patent merges the overload protection function with the existing control unit and FET switching mechanism. Instead of adding separate protective circuits, the control unit is enhanced to detect overload conditions and automatically adjust switching frequency, combining multiple functions into existing components and avoiding additional circuitry.
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
Prevents element damage and reduces costs by effectively managing overload operations, ensuring safe and reliable power supply without the need for high-specification components.
Implementation Method 1
a DC/AC inverter unit including a plurality of field effect transistors (FETs) and configured to perform power transfer and control corresponding to the converted constant voltage through a switching operation
Implementation Method 2
the logic gate configured to output a control signal for controlling a gate driver based on the results of the determination, and the gate driver configured to operate to block or output a pulse width modulation (PWM) signal based on the control signal
Implementation Method 3
a comparator configured to determine whether the value of an output current of the DC/AC inverter unit is greater than a preset threshold through a current sensor
Data Source
AI summary
A vehicle to load (V2L) converter for a vehicle includes a high voltage battery unit configured to supply power of an electric vehicle, a DC/DC converter unit configured to convert the supplied power to a voltage so that the voltage is output as a constant voltage, a DC/AC inverter unit including a plurality of field effect transistors (FETs) and configured to perform power transfer and control corresponding to the converted constant voltage through a switching operation, and a burst circuit unit configured to change a switching operation per unit time of the DC/AC inverter unit upon overload operation.