Bidirectional Flyback Converter Voltage Regulation
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Solution Overview
Problem
Flyback converters often experience over-voltage conditions due to instantaneous changes in load power consumption, which can damage the load and are typically addressed by dissipating excess energy, rendering it unusable.
Innovation Solution
A power converter circuit with control circuitry that allows energy to be conveyed in a reverse direction through the transformer, storing excess energy in a capacitor for later use, thereby maintaining output voltage within a desired range without wasting energy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If excess energy is dissipated through a resistive load to control output voltage, then output voltage is maintained within a desired range, but energy is wasted and cannot be reused
Solution Approach 1:
The patent converts the harmful effect of excess energy (which causes over-voltage) into a beneficial resource by enabling reverse energy flow through the transformer. The excess energy that would normally be dissipated is instead redirected back to the primary side and stored in the input capacitor, transforming a waste problem into a energy recovery opportunity
Solution Approach 2:
The patent implements energy recovery by capturing excess energy that would otherwise be discarded through resistive dissipation. The control circuitry detects over-voltage conditions and initiates reverse energy flow to retrieve the excess energy, storing it for later reuse, thereby preventing both energy waste and voltage instability
2Device complexity
If a unidirectional flyback converter is used, then the circuit structure is simple, but over-voltage conditions occur when load power consumption changes instantaneously
Solution Approach 1:
The patent introduces dynamic bidirectional energy flow capability into the flyback converter through control circuitry that can switch between forward and reverse energy transfer modes. This dynamic control allows the system to adapt to instantaneous load changes by reversing energy flow when over-voltage is detected, maintaining voltage stability without requiring complex additional hardware
Solution Approach 2:
The transformer in the patent serves multiple functions: it performs the standard forward energy transfer from primary to secondary side during normal operation, and also enables reverse energy transfer from secondary to primary side when over-voltage protection is needed. This multi-functionality allows a single component to handle both power conversion and over-voltage protection
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
This method effectively regulates output voltage by temporarily storing excess energy, preventing over-voltage conditions and ensuring efficient energy utilization.
Implementation Method 1
a transformer comprising a primary winding and a secondary winding... conveyance of a portion of the received energy through the secondary winding back through the primary winding
Implementation Method 2
the primary winding is coupled to storage device such as a respective input capacitor circuit. The excess energy conveyed in the reverse direction to the transformer is stored in the input capacitor circuit
Data Source
AI summary
A power converter circuit includes a transformer. The transformer includes a primary winding and a secondary winding. The power converter circuit uses energy conveyed from the primary winding of the transformer through the secondary winding of the transformer to produce an output voltage to power a load. Control circuitry of the power converter circuit initiates conveying a portion of the received energy through the secondary winding back through the primary winding to control a magnitude of the output voltage. For example, if the magnitude of the output voltage is above a desired setpoint value, such as due to a transient load condition or change in the setpoint of the output voltage, the control circuitry reduces the magnitude of the output voltage by conveying excess energy from an output capacitor (that stores the output voltage) through the secondary winding to the primary winding.