Power Supply Control Device for Stable CVCC Mode Switching
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Solution Overview
Problem
Conventional power supply devices face instability and low responsiveness in constant voltage constant current control due to complex configurations and high costs, particularly in cascade systems, and issues with switching between CC and CV control modes in parallel systems.
Innovation Solution
A control device with an output voltage and current detection unit, a difference value selection unit, and an operation amount generation unit that compares voltage and current differences to generate a control difference value, using a filter unit for gain and phase compensation to balance responsiveness and prevent interference between CV and CC control modes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a cascade system with separate CC and CV control units is used, then constant voltage constant current control can be implemented, but the device complexity increases and cost increases
Solution Approach 1:
The patent combines the CC control unit and CV control unit into a single integrated control device with a unified control processor. This single control unit manages both constant current and constant voltage operations, eliminating the need for separate control circuits while maintaining reliable CVCC control through centralized management of control parameters and switching logic.
Solution Approach 2:
The control device is designed as a multi-functional unit that can perform both constant current control and constant voltage control operations. The single control processor adapts its control strategy based on the charging state, switching between CC and CV modes as needed, thereby providing universal control capability for different charging stages without requiring separate dedicated control units.
2Device complexity
If a parallel control system is used, then the configuration is simpler, but instability occurs during switching between CC and CV control modes
Solution Approach 1:
The control device pre-establishes switching criteria and transition protocols between CC and CV modes. By preparing the control parameters and switching logic in advance, the system ensures smooth transitions without instability. The control processor monitors charging state parameters and proactively prepares for mode switching before it occurs, preventing control disruptions.
Solution Approach 2:
The control device implements dynamic switching between CC and CV modes based on real-time charging state parameters. The control processor continuously monitors voltage and current levels and dynamically adjusts the control mode accordingly, ensuring stable transitions. The system adapts its control strategy in real-time rather than using fixed static control configurations.
Data Source
AI summary
A control device and method are provided for a power supply device which can perform stable constant voltage constant current control with high responsiveness with a simple configuration. The control device includes: a voltage difference value generation unit which subtracts an output voltage value from a voltage target value to generate a voltage difference value; a current difference value generation unit which subtracts an output current value from a current target value to generate a current difference value; a difference value selection unit which compares the voltage difference value or a value based on the voltage difference value with the current difference value or a value based on the current difference value, and selects the smaller one as a control difference value; and an operation amount generation unit which generates an operation amount for controlling the power supply device based on the control difference value.