Auxiliary Power Supply Circuit for Wide-Input Ripple Stabilization
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Wide input voltage range DC power converters experience unstable voltage ripples before reaching a steady state, affecting the operation of electronic components due to unstable working voltage.
Innovation Solution
An auxiliary power supply circuit comprising a voltage follower unit with an electronic switch, resistor, and Zener diode, and a voltage comparison unit, which provides a stable auxiliary voltage to electronic components during unstable voltage conditions, ensuring they operate normally.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a Buck converter is used to convert wide input voltage range, then the input voltage range is extended, but unstable voltage ripples occur before reaching steady state
Solution Approach 1:
The patent introduces an auxiliary power supply circuit as an intermediary component between the Buck converter and the electronic components. This auxiliary circuit includes a voltage follower unit with electronic switch, resistor, and Zener diode, along with a voltage comparison unit. The auxiliary power supply provides a stable working voltage during the transient period before the Buck converter reaches steady state, thereby mediating the instability issue while maintaining the wide input voltage range capability.
2Adaptability or versatility
If the working voltage conversion circuit operates in wide input voltage range, then the power converter adaptability is improved, but the electronic components cannot receive stable working voltage during transient period
Solution Approach 1:
The auxiliary power supply circuit performs preliminary action by providing the required working voltage to electronic components before the Buck converter completes its steady-state establishment. The voltage comparison unit detects when the input voltage reaches a level sufficient to power the auxiliary circuit, and the voltage follower unit immediately begins providing stable voltage to electronic components, ensuring they are powered in advance rather than waiting for the main converter to stabilize.
3Adaptability or versatility
If the Buck converter converts wide input voltage to working voltage, then the voltage conversion capability is extended, but voltage ripples affect the normal operation of electronic components
Solution Approach 1:
The patent extracts the voltage ripple problem from the main Buck converter output by separating the working voltage supply into two independent paths: the main Buck converter path for steady-state operation, and the auxiliary power supply path for transient period operation. The auxiliary circuit specifically addresses and eliminates the harmful voltage ripple effects during the transient period by providing a separate, stable voltage source that does not suffer from the same ripple issues.
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 auxiliary power supply circuit stabilizes the working voltage for electronic components by compensating for voltage ripples and maintaining stability before and after the Zener diode breakdown, ensuring normal operation across varying input voltages.
Implementation Method 1
with the increase of the input voltage and after the Zener diode breaks down, the voltage on the second terminal of the electronic switch is provided as a regulated and stable auxiliary voltage for such electronic components
Data Source
AI summary
An auxiliary power supply circuit operating within a wide input voltage range has a voltage follower unit and a voltage comparison unit. The voltage follower unit has an electronic switch, a resistor, and a Zener diode. The electronic switch has a first terminal electrically connected to a voltage input terminal of the working voltage conversion circuit, a second terminal electrically connected to a voltage output terminal of the working voltage conversion circuit, and a control terminal. The resistor is electrically connected between the first terminal and the control terminal of the electronic switch. The Zener diode has a cathode electrically connected to the control terminal of the electronic switch. The voltage comparison unit has a detecting terminal electrically connected to the voltage input terminal of the working voltage conversion circuit, and an output terminal electrically connected to the control terminal of the electronic switch.