Digital Voltage Source Current Control Without Nested Servo Loops
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Solution Overview
Problem
Conventional current mode control methods for digitally controlled power supplies involve complex servo loops and require error signal compensation, which can be cumbersome and inefficient.
Innovation Solution
Implementing a hysteretic average current mode control that regulates output voltage by sensing output current and using upper and lower signals based on positive and negative offsets and the difference between a reference and feedback signal, eliminating the need for a secondary servo loop.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional current mode control methods are used with nested servo loops, then current control capability is achieved, but device complexity increases due to multiple compensation loops
Solution Approach 1:
The patent extracts the current control function from the complex nested servo loop structure and implements it through direct current sensing and comparison with reference signals. The current sense element directly senses the output current and compares it with upper and lower reference signals, eliminating the need for separate current compensation loops while maintaining current control capability.
Solution Approach 2:
The voltage control loop is designed to serve dual functions: both voltage regulation and current control. By using the same error signal generation mechanism for both voltage and current control, the patent reduces overall system complexity while maintaining both control capabilities through multi-functional loop design.
2Manufacturing precision
If conventional voltage source control is used, then voltage regulation is achieved, but ease of operation decreases when connecting multiple power sources in parallel
Solution Approach 1:
The patent implements dynamic current sharing control by continuously adjusting the operating point of each power source based on real-time current sensing. The control system dynamically modifies the duty cycle of each source to maintain equal current distribution, enabling easy parallel operation while preserving precise voltage regulation through adaptive control.
Solution Approach 2:
The patent employs feedback control by sensing the output current and comparing it with reference signals to generate error signals. This feedback mechanism automatically adjusts the control parameters to maintain balanced current sharing among parallel power sources, simplifying parallel operation while ensuring stable voltage output.
Data Source
AI summary
The present disclosure relates to average current mode control of digital voltage sources. A digital control signal is generated to control the voltage source. The digital control signal is based on output current of a voltage source and upper and lower signals. The upper and lower signals are based on respective positive and negative offsets and a difference between a reference signal and a feedback signal related to the output voltage.