Switching Power Supply Mode Transition Control
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Solution Overview
Problem
Conventional switching power supplies face challenges in providing quick transient response and high accuracy due to limitations in linear control modes, particularly when transitioning from non-linear control modes, leading to output voltage variations caused by load current changes.
Innovation Solution
A switching power supply that predicts and sets a linear control instruction value based on load current during non-linear control modes, using a digital control section with error detection and pulse generation capabilities, allowing for seamless transitions between control modes to minimize output variations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If linear control mode is used, then voltage accuracy is maintained, but transient response speed is limited due to bandwidth restrictions
Solution Approach 1:
The control system dynamically switches between non-linear control mode (for fast transient response) and linear control mode (for steady-state accuracy). The switching is triggered when voltage deviation exceeds a threshold, enabling the system to adapt its control characteristics based on operating conditions.
Solution Approach 2:
Before switching to linear control mode, the system predicts the instruction value that should be used in linear control mode based on current load current and historical data. This preliminary preparation ensures seamless transition and prevents voltage overshoot or oscillation during mode switching.
2Speed
If non-linear control mode is used, then transient response speed is improved, but output voltage accuracy deteriorates during mode transition
Solution Approach 1:
The system predicts the appropriate linear control instruction value before actually switching modes. This prediction is based on load current and stored historical values, ensuring that the linear control mode starts with the correct setpoint, thereby maintaining voltage accuracy during transition.
Solution Approach 2:
The system continuously monitors voltage deviation and uses this feedback to determine when to switch between control modes. The prediction mechanism also uses feedback from load current and historical instruction values to accurately forecast the appropriate linear control parameter.
3Stability of the object's composition
If huge decoupling capacitors are used, then transient voltage variation is suppressed, but packaging area increases and reliability decreases
Solution Approach 1:
The patent replaces the passive mechanical approach of using large decoupling capacitors with an active digital control system. The control section processes A/D converted signals and generates PWM control signals dynamically, achieving transient suppression without requiring large physical capacitors.
Solution Approach 2:
The system dynamically changes control parameters (instruction values) based on load conditions and voltage deviation. By adjusting the PWM duty cycle instruction value in real-time based on predicted load changes, the system achieves transient response without relying on large energy storage capacitors.
Data Source
AI summary
A switching power supply that can suppress output variation at a time of transition of a control mode from a non-linear control mode to a linear control mode. The switching power supply includes instruction value forming circuitry that forms, in a linear control mode, a linear control instruction value for linearly control a switching circuit based on an error of an output voltage, and forms, in a non-linear control mode, a non-linear control instruction value for non-linearly control the switching circuit. The instruction value forming circuitry predicts, in the non-linear control mode, a linear control instruction value suited to the load current in the non-linear control mode, and uses the predicted linear control instruction value for an initial value of the linear control instruction value at a time of transition from the non-linear control mode to the linear control mode.