Voltage Control Using Absolute Value Triangular Wave Filtering
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Solution Overview
Problem
Conventional voltage control methods using high-side and low-side FETs in switching controllers face instability during load transient conditions, leading to continuous voltage increase due to negative triangular wave signals, which results in unstable output voltage.
Innovation Solution
The proposed solution involves using an absolute value generator to filter negative voltage components from the triangular wave signal and an AND gate logic to compare feedback and target voltages, ensuring that switches only turn on when the sum signal is greater than the target voltage, thereby stabilizing the load voltage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional switching control using high-side and low-side FETs is used, then voltage control is achieved, but output voltage becomes unstable during load transient conditions
Solution Approach 1:
An intermediary control mechanism is introduced that monitors both the triangular wave signal and feedback voltage before generating the final control signal. This intermediary layer prevents direct switching based on flawed comparisons, thereby stabilizing output voltage during transient conditions while maintaining the overall simplicity of the switching control structure.
Solution Approach 2:
The patent implements a feedback mechanism where the feedback voltage from the output is continuously compared with the triangular wave signal. This feedback loop detects voltage deviations during load transients and adjusts the switching control accordingly, ensuring stable output voltage while preserving the ease of operation through automated closed-loop control.
2Productivity
If triangular wave signal comparison is used for control, then switching control is achieved, but negative voltage components cause continuous energy supply to load
Solution Approach 1:
The harmful negative voltage components are extracted and removed from the control signal generation process. By taking out only the positive voltage portions of the triangular wave signal for comparison with feedback voltage, the patent prevents unnecessary energy supply to the load while maintaining effective switching control efficiency.
Solution Approach 2:
The patent converts the potentially harmful negative voltage components into a benefit by using their absence as a control criterion. By designing the control logic to respond only to positive voltage portions, the system transforms what would be a source of energy waste into a mechanism for improving control efficiency and reducing unnecessary energy supply.
3Measurement precision
If feedback voltage is continuously compared with triangular wave signal, then voltage regulation is achieved, but instability occurs during load transitions
Solution Approach 1:
The patent applies preliminary action by preparing the control signal in advance through selective comparison of positive voltage portions. Before the instability can occur during load transitions, the control mechanism is already positioned to respond appropriately, preventing voltage spikes or oscillations while maintaining precise voltage measurement and regulation.
Data Source
AI summary
The present invention discloses a voltage control method. First, the load voltage of the load is divided to generate a feedback voltage. Then, an absolute value of a periodic triangular wave signal is retrieved to generate a positive feedback signal, which and the feedback voltage are then combined to produce a sum signal. The sum signal is then compared with a target voltage and when the sum signal is less than the target voltage, a control signal is generated and thus the load voltage is updated and stabilized using an input voltage. In an alternative method, the feedback voltage and the periodic triangular wave signal are combined to generate a sum signal, which is compared with the target voltage. When sum signal is less than the target voltage, a control signal is generated and thus the load voltage is for updated and stabilized using an input voltage.