Feedback Control Device for Smooth Current Voltage Switching
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Solution Overview
Problem
Conventional feedback control devices experience unstable control when switching between binary parameters, leading to variations in feedback control values.
Innovation Solution
The feedback control device incorporates an input changeover switch and an output changeover switch, along with an I control unit and an adder, to smoothly transition between constant current and constant voltage control, ensuring stable PI control values by maintaining the I control value consistency during switching.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If switching between first feedback control and second feedback control is performed on binary parameters, then control flexibility is improved, but control value variations occur causing instability
Solution Approach 1:
The I control value from the first feedback control is held in a storage element (such as a flip-flop or register) before switching occurs. This preliminary storage action ensures that when switching between feedback controls, the I control value is already prepared and maintained, preventing any interruption or variation in the control signal during the transition between control modes.
Solution Approach 2:
A switching control unit acts as an intermediary between the first and second feedback controls. This intermediary component receives control signals from both feedback paths and selectively routes them to the output, ensuring smooth transitions without direct abrupt switching. The intermediary maintains continuity of the I control value throughout the switching process, eliminating instability caused by direct binary parameter switching.
2Adaptability or versatility
If switching between constant current control and constant voltage control is performed, then operational versatility is improved, but control value discontinuity occurs
Solution Approach 1:
The first feedback control (constant current) and second feedback control (constant voltage) are merged through a common switching control unit that integrates both control paths. The I control values from both feedback controls are combined in such a way that the held I control value serves as a bridge between the two operational modes, ensuring continuous and smooth transitions without discontinuities in the control signal.
Solution Approach 2:
The switching control unit is designed to maintain continuous control action during mode transitions. By holding the I control value from the first feedback control and seamlessly integrating it with the second feedback control, the system ensures that the useful control action continues without interruption or discontinuity, enabling smooth operational transitions between constant current and constant voltage modes.
Data Source
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Figure 3(a)~3(d)
AI summary
To provide a feedback control device that achieves smooth continuous control at the time of switching of binary feedback controls. When, as a result of constant current feedback control being performed through a connection between a current control unit (12) and an I control unit (24), a detected measured voltage value of a control object (21) reaches a preset value that is maintained by constant voltage feedback control, a ul/u2 determination unit (switching determination unit) (27) controls changeover switches (22) and (23) to connect a voltage control unit (15) and the I control unit (24) and, in addition, connect the voltage control unit (15) to an adder (25) to which the I control unit (24) is connected, and performs switching to constant voltage feedback control.