Power Supply Device Ripple Suppression via Bottom Voltage Controller
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Solution Overview
Problem
Existing power supply devices struggle to effectively suppress ripple components in output current at low loss, especially when converting AC power to DC voltage for lighting applications like LEDs, as they either incur significant losses or fail to adequately reduce harmonic waves.
Innovation Solution
A power supply device configuration that includes a voltage conversion circuit, a current controller, and a current controlling circuit which uses voltage and current detecting signals to minimize ripple in the output current by adjusting the reference voltage through differential and comparator circuits, ensuring low loss and reduced harmonic generation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If a constant-current circuit with a current-controlling transistor is used to remove ripple from output current, then the ripple component is reduced, but the power loss increases due to voltage drop across the transistor
Solution Approach 1:
The patent introduces a bottom voltage controller as an intermediary device that detects the bottom voltage of the output voltage and adjusts the reference voltage of the constant-current circuit accordingly. This mediator enables coordinated control between the DC/DC converter and constant-current circuit, allowing ripple suppression without excessive power loss by optimizing the operating point of the current-controlling transistor.
Solution Approach 2:
The patent implements a feedback mechanism where the bottom voltage controller continuously monitors the bottom voltage of the output voltage and adjusts the reference voltage in real-time. This feedback loop ensures that the constant-current circuit operates at optimal points, suppressing ripple components while minimizing power loss through dynamic adaptation to changing conditions.
2Loss of energy
If the current value limited by the constant-current circuit is significantly low, then power loss is reduced, but the current-controlling transistor cannot absorb ripple voltage, resulting in insufficient ripple reduction
Solution Approach 1:
The patent employs dynamic control by introducing a bottom voltage controller that continuously adapts the reference voltage based on the detected bottom voltage. This dynamic adjustment allows the system to respond to varying ripple conditions in real-time, effectively suppressing output ripple while maintaining enhanced harmonic reduction characteristics throughout different operating conditions.
Solution Approach 2:
The patent changes the reference voltage parameter dynamically through the bottom voltage controller based on the detected bottom voltage conditions. By adjusting this key parameter, the system can optimize the trade-off between harmonic reduction and ripple suppression, allowing the power supply to maintain low harmonic content while effectively eliminating output ripple across different operating points.
Data Source
AI summary
A power supply device includes a voltage conversion circuit, a current controller and a current controlling circuit. The voltage conversion circuit generates a DC voltage from an AC power source and outputs the DC voltage to a pair of output terminals. The current controller is disposed on a first current path through which an output current flows and controls the current in the first current path. The current controlling circuit drives the current controller so as to reduce a ripple component generated in the output current, based on (i) a voltage at a first potential point set on a path from an output terminal at a high-potential side of the voltage conversion circuit to the current controller in the first current path and (ii) a current detecting voltage indicating the magnitude of the output current.