Power Supply Device Voltage Comparison Control
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Solution Overview
Problem
Conventional power supply devices fail to maintain a stable power output for a fixed time period after the power input is shut off, as the DC-DC converter stops operating once the power switch is turned off, leading to a degradation in power factor and inability to sustain output voltage.
Innovation Solution
A power supply device with a voltage comparison section and converter control system that compares the output voltage from the PFC with a reference voltage, allowing the DC-DC converter to continue operating using stored energy in the output capacitor, maintaining power output for a predetermined time even after the power switch is turned off or the AC cord is unplugged.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of moving object
If the DC-DC converter stops operating when the power switch is turned off, then the device complexity is reduced, but the power output cannot be maintained for a fixed time period after power input cessation
Solution Approach 1:
The voltage comparison section and voltage comparison result output section are activated in advance to detect when the PFC output voltage exceeds the reference voltage. This preliminary detection enables the control section to timely activate the DC-DC converter before power input cessation, ensuring continuous power output maintenance for the required time period without excessive complexity.
Solution Approach 2:
The voltage comparison section continuously monitors the PFC output voltage and provides feedback to the voltage comparison result output section. This feedback mechanism enables the control section to make real-time decisions on DC-DC converter operation, maintaining power output stability while avoiding overly complex control systems through efficient feedback loops.
2Duration of action of moving object
If the DC-DC converter continues operating using stored energy in the output capacitor, then the power output is maintained for a fixed time period, but the use of energy increases
Solution Approach 1:
The DC-DC converter operates at partial capacity using only the stored energy in the output capacitor rather than full continuous operation. This partial action approach maintains power output for the required time period after power input cessation while minimizing energy consumption by utilizing existing stored energy rather than requiring continuous external power input.
3Ease of operation
If the two converters are activated and stopped independently, then the ease of operation is improved, but the power factor degrades and output voltage stability is lost
Solution Approach 1:
The voltage comparison section provides continuous feedback on the PFC output voltage status to the control section. This feedback mechanism ensures that the DC-DC converter is activated or stopped based on actual voltage conditions rather than independent control signals, maintaining output voltage stability and power factor while preserving operational simplicity through condition-based control.
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
The solution enables the power supply device to sustain a stable power output for a fixed time period after power input cessation, maintaining the power factor and ensuring continuous operation of critical loads like medical instruments, by utilizing the stored energy in the output capacitor.
Implementation Method 1
maintaining a power output for a fixed time period after a power input is shut off... utilizing the stored energy in the output capacitor
Data Source
AI summary
A power supply device includes a first converter which converts an input voltage to a first voltage, a second converter which converts the first voltage from the first converter to a second voltage, a voltage comparison section which compares the first voltage outputted from the first converter with a predetermined reference voltage, a voltage comparison result output section which outputs a first signal until the first voltage is determined to be higher than the predetermined reference voltage by the voltage comparison section and retains a second signal as an output after the first voltage is determined to be higher than the predetermined reference voltage, and a converter control section which controls the second converter to stop when the first signal is outputted from the voltage comparison result output section and controls the second converter to operate when the second signal is outputted from the voltage comparison result output section.