Auxiliary Boost Circuit Overvoltage Protection
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Solution Overview
Problem
Existing power supplies face damage due to gradual voltage drop, necessitating high-specification components in DC-DC converting circuits to prevent damage, increasing costs.
Innovation Solution
A power supply system comprising a DC-DC converting circuit, an auxiliary boost circuit, a power factor correction circuit, and a rectification circuit, where a voltage detection unit triggers a boost unit to maintain output voltage, and synchronization signals manage the shutdown of the boost circuit and DC-DC converting circuit to prevent overvoltage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the output voltage drops gradually when power supply stops, then the DC-DC converting circuit and load apparatus are protected, but the components must have high specifications (high voltage resistance) which increases cost
Solution Approach 1:
The auxiliary boost circuit is activated before the DC-DC converting circuit is turned off to preemptively boost the output voltage to zero. This preliminary action prevents the gradual voltage drop that would otherwise occur during shutdown, allowing the use of lower specification components while maintaining circuit protection.
Solution Approach 2:
The auxiliary boost circuit acts as an intermediary between the power supply shutdown process and the DC-DC converting circuit. It mediates the voltage transition by actively boosting the voltage to zero, replacing the passive gradual drop mechanism and eliminating the need for high-voltage-resistance components.
2Device complexity
If the auxiliary boost circuit is turned off after the DC-DC converting circuit, then the shutdown sequence is simple, but the auxiliary boost circuit experiences over voltage phenomenon
Solution Approach 1:
A voltage detection unit continuously monitors the output voltage of the power factor correction circuit and provides feedback to the control unit. Based on this feedback, the control unit determines when to activate the auxiliary boost circuit and when to turn it off, ensuring synchronized shutdown with the DC-DC converting circuit and preventing overvoltage conditions.
Solution Approach 2:
The shutdown timing of the auxiliary boost circuit is made dynamic rather than fixed. The control unit adjusts the turn-off timing based on real-time voltage detection, allowing the boost circuit to remain active until the DC-DC converting circuit is fully shutdown, thereby preventing overvoltage while maintaining simple control logic.
3Reliability
If high specification components are used in DC-DC converting circuit to withstand voltage variation, then circuit reliability is improved, but manufacturing cost increases
Solution Approach 1:
The auxiliary boost circuit performs a preliminary voltage boosting action during shutdown to proactively eliminate voltage variations. By pre-emptively boosting the voltage to zero before the DC-DC converting circuit is turned off, it eliminates the need for high-voltage-resistance components, maintaining reliability while reducing manufacturing cost.
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 ensures simultaneous shutdown of the auxiliary boost and DC-DC converting circuits, eliminating overvoltage phenomena and enhancing power supply reliability.
Implementation Method 1
The auxiliary boost circuit comprises a boost unit, a voltage detection unit, a control unit, a management unit and an output side capacitor. The boost unit is electrically connected to the direct current to direct current converting circuit and the power factor correction circuit.
Implementation Method 2
The output side capacitor is electrically connected to the direct current to direct current converting circuit and the boost unit. The output side capacitor receives the boost voltage to supply power to the direct current to direct current converting circuit.
Data Source
AI summary
A power supply avoiding an auxiliary boost circuit over voltage includes a direct current to direct current converting circuit, the auxiliary boost circuit and a power factor correction circuit. The auxiliary boost circuit includes a voltage detection unit, a control unit, a management unit and a boost unit. When the voltage detection unit detects that an output voltage of the power factor correction circuit is less than a predetermined voltage, the control unit enters a hold up time mode. Before the hold up time mode is finished, the control unit sends a first synchronization signal to the management unit, so that the management unit sends a second synchronization signal to the control unit, so that the control unit turns off the boost unit before or at the same time the management unit turns off the direct current to direct current converting circuit.