Power Supply Feedback Control With Distinct Fault Voltage Detection
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Solution Overview
Problem
Existing power supply control devices lack the ability to distinctly detect abnormalities in multiple voltage generation circuits, leading to potential misinterpretation of output voltage abnormalities and inability to determine which circuit is faulty.
Innovation Solution
A power supply control device with a state detection circuit that utilizes multiple voltage generation circuits and comparators to generate and compare determination voltages, allowing for distinct identification of abnormalities in each circuit, and a signal output circuit to indicate specific abnormalities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple voltage generation circuits are used for different functions (reference voltage generation, output monitoring, state detection), then the functionality and reliability of the power supply control device is improved, but it becomes difficult to distinguish which circuit is abnormal when output voltage abnormalities occur
Solution Approach 1:
The state detection circuit divides the abnormality detection function into separate detection paths for each voltage generation circuit. It generates different determination voltages (first, second, and third determination voltages) corresponding to each circuit (first voltage generation circuit, second voltage generation circuit, and third voltage generation circuit), allowing independent evaluation of each circuit's state through dedicated comparison operations.
Solution Approach 2:
Each voltage generation circuit is assigned a unique identification characteristic through its specific determination voltage. The first voltage generation circuit is associated with the first determination voltage, the second with the second determination voltage, and the third with the third determination voltage. This local differentiation enables precise identification of which specific circuit is abnormal when comparing against the feedback voltage.
2Device complexity
If a single reference voltage is used for feedback control, then the control simplicity is maintained, but the ability to detect abnormalities in the reference voltage generation circuit itself is lost
Solution Approach 1:
The state detection circuit performs preliminary abnormality detection by comparing the feedback voltage with multiple determination voltages generated from different voltage generation circuits before final control decisions are made. This preliminary detection mechanism identifies abnormalities in the reference voltage generation circuit (first voltage generation circuit) while the feedback control is still operating, enabling proactive fault detection without disrupting the simplicity of the control structure.
Solution Approach 2:
The state detection circuit acts as an intermediary between the feedback control system and the voltage generation circuits. It uses determination voltages as intermediate reference values to indirectly assess the health status of each voltage generation circuit, including the reference voltage generation circuit, without directly interfering with the primary feedback control loop's simplicity.
3Measurement precision
If output voltage stabilization is achieved through feedback control using a single reference voltage, then the stabilization accuracy is maintained, but the system cannot distinguish between output voltage abnormalities caused by different circuit failures
Solution Approach 1:
The state detection circuit segments the fault detection function by creating separate determination voltage paths for each voltage generation circuit. When output voltage abnormalities occur, the feedback control maintains stabilization accuracy using the primary reference voltage, while the state detection circuit simultaneously compares the feedback voltage against multiple segmented determination voltages to identify which specific circuit segment is faulty.
Solution Approach 2:
Each voltage generation circuit contributes a unique determination voltage with specific local characteristics. The first determination voltage reflects the state of the first voltage generation circuit, the second determination voltage reflects the second circuit's state, and the third determination voltage reflects the third circuit's state. This local quality differentiation preserves the overall feedback control accuracy while enabling precise fault source discrimination through comparative analysis.
Data Source
AI summary
In a power supply device, the state of an output stage circuit is controlled based on a feedback voltage (Vfb) corresponding to an output voltage and a reference voltage (Vref) generated by a first voltage generation circuit (11), thereby stabilizing the output voltage at a target voltage. An abnormality of the output voltage is monitored based on the feedback voltage and an output monitoring voltage (V_H, V_L) generated by a second voltage generation circuit (12). Abnormalities of the first and second voltage generation circuits are detected distinctively based on a first determination voltage (V1a, V1b) generated by the first voltage generation circuit, a second determination voltage (V2a, V2b) generated by the second voltage generation circuit, and a third determination voltage (V3a, V3b, V3c, V3d) generated by a third voltage generation circuit.