Auxiliary Boost Circuit for DC-DC Input Voltage Stabilization
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Solution Overview
Problem
Existing power supply apparatuses with direct current to direct current conversion circuits are prone to damage due to gradual voltage drops when the alternating current power supply stops, leading to increased costs from high specification components required for protection.
Innovation Solution
Incorporating an auxiliary boost circuit with a voltage detection unit, control unit, boost unit, and boost bypass unit to manage the power factor correction power, switching between boost and bypass modes based on voltage levels to stabilize the input voltage for the direct current to direct current conversion circuit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the power factor correction power drops gradually to zero when AC power stops, then the DC-DC conversion circuit and load are protected, but the input voltage variation still damages the DC-DC conversion circuit components
Solution Approach 1:
The auxiliary boost circuit serves as an intermediary between the PFC circuit and DC-DC conversion circuit. When AC power stops, the boost circuit actively maintains the input voltage to DC-DC conversion circuit within acceptable ranges, preventing voltage variation damage while allowing the PFC output to drop naturally for protection.
Solution Approach 2:
The system dynamically switches between two operational modes: during normal operation, the boost bypass unit connects for direct power transmission; when AC power stops and voltage drops, the control unit switches to boost mode to actively regulate voltage. This dynamic adaptation resolves the contradiction by providing different protection mechanisms for different operational states.
2Reliability
If high specification components with high voltage resistance are used in DC-DC conversion circuit, then the circuit is protected from voltage variation, but the cost of the circuit increases
Solution Approach 1:
The auxiliary boost circuit performs preliminary action by detecting voltage drops early and actively compensating before critical damage occurs. The voltage detection unit monitors the input voltage to DC-DC conversion circuit and triggers boost operation in advance, preventing the need for expensive high-voltage-rated components.
Solution Approach 2:
Instead of using expensive high-specification components throughout the DC-DC conversion circuit, the invention uses a cheaper voltage regulation approach with the boost circuit that only activates when needed. This allows the use of standard, lower-cost components in the DC-DC circuit while maintaining protection through the auxiliary boost mechanism.
3Stability of the object's composition
If the boost unit is always on to maintain voltage, then voltage stability is improved, but energy loss increases and efficiency decreases
Solution Approach 1:
The boost unit operates periodically rather than continuously. The control unit monitors voltage conditions and activates the boost unit only when AC power stops and voltage drops below acceptable levels. During normal operation, the boost bypass unit remains active with zero energy loss, and the boost unit stays off, minimizing energy consumption while maintaining stability when needed.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This solution reduces voltage variation and extends the hold-up time, optimizing the design of the direct current to direct current conversion circuit and lowering its cost by eliminating the need for high-specification components.
Implementation Method 1
the boost unit boosts the power factor correction power and then the boosted power factor correction power is sent to the direct current to direct current conversion circuit
Data Source
AI summary
A power supply apparatus includes a rectification circuit, a power factor correction circuit, an auxiliary boost circuit and a direct current to direct current conversion circuit. The auxiliary boost circuit includes an input contact, an output contact, a voltage detection unit, a control unit, a boost unit and a boost bypass unit. When a voltage value of a power factor correction power is not greater than a predetermined voltage value, the control unit is configured to turn off the boost bypass unit and turn on the boost unit, so that the boost unit boosts the power factor correction power and then the power factor correction power is sent to the direct current to direct current conversion circuit through the boost unit and the output contact.