Voltage Conversion Control for Stable Load Detection During Transitions
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Solution Overview
Problem
Power supply devices mistakenly detect changes in load during transitions in output voltage, leading to malfunctions and inefficiencies due to fluctuations in sensing current.
Innovation Solution
Implement a compensation current in the sensing current during transition periods to stabilize the load detection, using a controller with a load sensor and current compensation unit to adjust the sensing current based on output voltage changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the output voltage is adjusted by changing the duty ratio of the control signal, then the power supply device can respond to various applications with different voltage levels, but during the transition period the sensing current fluctuates causing malfunctioning
Solution Approach 1:
The controller identifies transition periods before they complete and proactively applies compensation current during these periods. By detecting the start of a voltage transition and applying compensation current in advance and throughout the transition, the system prevents sensing current fluctuations from causing malfunction before they can affect load detection accuracy.
Solution Approach 2:
The controller changes the compensation current parameter dynamically based on the transition period status. During normal operation, compensation current is zero or minimal, but during transition periods, the compensation current parameter is adjusted to counteract the fluctuations in sensing current, thereby maintaining reliable load detection despite voltage changes.
2Measurement precision
If the sensing current is used to detect load changes, then the power supply device can monitor load conditions, but during voltage transitions the sensing current changes even when load remains constant, causing false detection
Solution Approach 1:
The controller continuously monitors the output voltage level and uses this feedback to identify when a transition period is occurring. Based on this feedback, the controller adjusts the compensation current accordingly, adding it during transition periods and removing it when transitions are complete, thereby maintaining accurate load detection throughout operation.
Solution Approach 2:
The compensation current acts as an intermediary element that mediates between the voltage transition process and the sensing current. By introducing this intermediate compensation current, the system isolates the sensing current from the direct impact of voltage transitions, allowing accurate load detection to be maintained even during voltage changes.
3Device complexity
If the power supply device operates without compensation current, then the device complexity is lower, but malfunctioning occurs during output voltage transitions
Solution Approach 1:
The controller performs multiple functions: it regulates output voltage by adjusting duty ratio, detects transition periods, generates compensation current when needed, and monitors load conditions. By making the controller multi-functional, the system avoids adding separate dedicated circuits for each function, thereby maintaining relatively simple device complexity while achieving reliable operation during transitions.
Data Source
AI summary
A power supply device includes a voltage conversion circuit including at least one switch device operating in response to a control signal, and the voltage conversion circuit receives an input voltage and generates an output voltage, higher or lower than an input voltage, depending on a duty ratio of the control signal, and a controller changing the duty ratio of the control signal to adjust a level of the output voltage. The controller includes a load sensor detecting a sensing current from the at least one switch device, and a current compensation unit applying a compensation current to the sensing current input to the load sensor during a transition period in which the output voltage changes from a first level to a second level.