DC Power Supply Circuit Voltage Stability Control
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Solution Overview
Problem
Existing DC power supply devices face challenges in maintaining stable output voltage while minimizing device size and power loss, particularly when dealing with high-voltage applications, as they often experience intermittent oscillation and increased AC components, leading to reduced measurement accuracy and increased component size due to the need for large low-pass filters or inductors.
Innovation Solution
A DC power supply circuit that incorporates a voltage regulator circuit with a transistor in series, a transformer, a switch element, and a control circuit to adjust the duty ratio of the switch element based on target voltage, operating in linear and saturation regions to control output voltage, thereby reducing AC components and power loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the output voltage is reduced to a low level, then the power supply can cover a wider voltage range, but intermittent oscillation occurs and AC components increase remarkably
Solution Approach 1:
The patent divides the voltage regulation into two independent stages: a series regulator for coarse voltage adjustment and a switching regulator for fine voltage control. This segmentation allows each regulator to operate in its optimal range, preventing intermittent oscillation while covering a wide voltage range.
Solution Approach 2:
The series regulator acts as an intermediary between the input voltage and the switching regulator. It pre-regulates the voltage to a stable level before it reaches the switching regulator, eliminating the intermittent oscillation that would otherwise occur when the switching regulator tries to regulate low output voltages.
2Reliability
If a low-pass filter or inductor is added to remove AC components, then output voltage stability improves, but device size increases
Solution Approach 1:
Instead of using a large low-pass filter to remove AC components, the patent converts the potential harm of AC components into a benefit by using the series regulator to prevent their generation in the first place. The series regulator maintains stable voltage that prevents intermittent oscillation, eliminating the need for large filtering components.
3Reliability
If a series regulator is used to control output voltage magnitude, then voltage regulation improves, but power loss increases
Solution Approach 1:
The patent segments the voltage regulation function between two regulators: the series regulator handles coarse voltage adjustment where it is most efficient, and the switching regulator handles fine voltage control where it minimizes power loss. This segmentation optimizes the overall power efficiency while maintaining stable voltage regulation.
Solution Approach 2:
The series regulator performs partial voltage regulation rather than complete regulation. It only handles the coarse adjustment portion of voltage control, leaving the fine regulation to the more efficient switching regulator, thereby reducing overall power loss while maintaining stability.
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 enhances output voltage stability while preventing an increase in power supply device size and power loss, effectively managing AC components and optimizing power regulation across varying voltage ranges.
Implementation Method 1
a transformer (3) including a primary winding (3a) connected to the voltage regulator circuit (2), and a secondary winding (3b)
Implementation Method 2
a rectifier circuit (5) connected to the secondary winding (3b) and converting a voltage output from the secondary winding (3b) into a DC voltage
Data Source
AI summary
A DC power supply circuit includes a voltage regulator circuit, a transformer including a primary winding, a transistor connected to the primary winding and alternately repeating switching on and off of a current, a rectifier circuit connected to a secondary winding and converting a voltage output from the secondary winding into a DC voltage, and a control circuit for controlling an on/off duty ratio of the transistor according to a target voltage. When the target voltage is included in a first voltage range, the control circuit sets the duty ratio to be constant, and a transistor of the regulator circuit operates in a linear region. When the target voltage is included in a second voltage range higher than the first voltage range, the control circuit changes the duty ratio according to the target voltage, and the transistor operates in a saturation region.