DC-DC Controller Load Transient Override Circuit
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Solution Overview
Problem
Existing DC-DC power supplies face challenges in maintaining a fixed regulated voltage during heavy loads, as the output voltage suddenly drops due to insufficient transient response energy, failing to quickly provide the necessary energy.
Innovation Solution
A DC-DC controller with a PWM calculation circuit, load transient detection circuit, and override time calculation circuit is implemented, which adjusts the duty cycle of the PWM signal based on an override control signal to manage load transients and maintain output voltage stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If a transient response signal is provided to control the DC-DC converter, then the response speed is improved, but the energy of the transient response signal is not great enough to maintain the output voltage at the fixed regulated voltage
Solution Approach 1:
The load transient detection circuit detects load transient events in advance and generates an override control signal before the output voltage deviates significantly. This preliminary action allows the PWM calculation circuit to adjust the duty cycle proactively, providing sufficient energy to maintain the output voltage at the fixed regulated voltage during load transients.
Solution Approach 2:
The system dynamically adjusts the duty cycle of the PWM signal based on real-time load conditions. The override control signal modifies the duty cycle dynamically during load transient events, enabling the power supply to adapt quickly to changing load requirements and maintain stable output voltage with adequate energy delivery.
2Reliability
If the duty cycle is adjusted quickly to provide more energy during heavy load, then the output voltage stability is improved, but the control complexity increases
Solution Approach 1:
The load transient detection circuit continuously monitors the output voltage and provides feedback about load transient events. This feedback mechanism enables the system to automatically adjust the duty cycle through the override control signal, maintaining output voltage stability without requiring complex manual control logic.
Solution Approach 2:
The override control signal acts as an intermediary between the load transient detection circuit and the PWM calculation circuit. It translates detected load transient events into appropriate duty cycle adjustments, simplifying the control architecture by providing a dedicated control pathway rather than requiring complex direct control logic.
Data Source
AI summary
A DC-DC controller and an operation method thereof are provided. The DC-DC controller is configured to connect an output stage. The DC-DC controller includes a pulse width modulation (PWM) calculation circuit, a load transient detection circuit, and an override time calculation circuit. The PWM calculation circuit provides a PWM signal to the output stage. The load transient detection circuit receives an input signal related to an output voltage of the output stage. The load transient detection circuit provides a control signal according to the input signal and a predetermined input signal. The override time calculation circuit provides an override control signal with a predetermined time to the PWM calculation circuit according to the control signal. The PWM calculation circuit adjusts a duty cycle of the PWM signal according to the override control signal.