DC Stabilization Power Supply Drive Current Clamping
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Solution Overview
Problem
Conventional direct current stabilization power supply apparatuses face challenges in maintaining a suitable drive current when the output voltage becomes negative, leading to instability and potential overcurrent issues during startup.
Innovation Solution
A direct current stabilization power supply apparatus with an output control device, direct current stabilization portion, and drive current limitation portion that monitors the comparison voltage and holds the drive current at a lower-limit value when the voltage drops below a threshold, preventing overcurrent and ensuring stable operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the drive current is lowered to curb heat quantity at the time of short-circuit, then the heat quantity is reduced, but the drive current becomes 0 at small negative voltage and stable operation cannot be secured
Solution Approach 1:
The patent changes the parameter of drive current from a continuously variable value to a clamped constant value when voltage drops below a threshold. The drive current limitation portion monitors the comparison voltage and clamps the drive current at a predetermined lower-limit current value when the comparison voltage is equal to or lower than a predetermined threshold voltage, preventing the current from dropping to 0 while still limiting excessive current.
2Quantity of substance
If the clamped voltage is dropped to a negative voltage to lower drive current, then the drive current is reduced, but the fold-back type drooping characteristic becomes substantially the same as the antecedent characteristic and drive current can become 0
Solution Approach 1:
The patent applies preliminary anti-action by proactively clamping the drive current before it can drop to 0 during negative voltage conditions. The drive current limitation portion anticipates the problem of drive current becoming 0 and preemptively maintains it at a safe lower-limit value, preventing the startup failure that would otherwise occur.
3Loss of energy
If the drive current at the time of short-circuit is excessively lowered, then the heat quantity is reduced, but the drive current can become 0 even at relatively low negative voltage due to temperature changes and differences in circuit-device characteristics
Solution Approach 1:
The patent implements feedback by having the drive current limitation portion continuously monitor the comparison voltage and adjust the drive current accordingly. When the comparison voltage drops below the threshold, the system feedbacks to maintain the drive current at the lower-limit value, compensating for temperature changes and circuit-device characteristic variations that would otherwise cause the current to drop to 0.
Data Source
AI summary
A direct current stabilization power supply apparatus, comprising: an output control device which generates a voltage corresponding to a drive current given and outputs it as an output voltage; a direct current stabilization portion which gives the drive current to the output control device to equalize a comparison voltage corresponding to the output voltage with a predetermined reference voltage and makes the output control device generate a desired output voltage; and a drive current limitation portion which monitors the comparison voltage and lowers the drive current according to a drop in the comparison voltage, wherein, when the comparison voltage is equal to or lower than a predetermined threshold voltage, the drive current limitation portion carries out an operation to hold the drive current at a predetermined lower-limit current value, or an operation to clamp a lower-limit value of the comparison voltage at a predetermined voltage value. Accordingly, even if the output voltage becomes a negative voltage, it is possible to secure a suitable drive current.