Isolated Transformer Power Supply With Common-Wiring Voltage Control
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Solution Overview
Problem
Existing isolated power supply devices face challenges in maintaining controllability of output voltages across transformers when variations occur in the magnitudes of loads connected to power feeding targets.
Innovation Solution
The proposed isolated power supply device includes a plurality of transformers with input and control windings, a control switch, control wirings, and a common wiring. The control switch is turned on and off based on the voltage value of the common wiring, ensuring magnetic energy is transferred between transformers to stabilize output voltages.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple transformers are used to supply power to multiple power feeding targets, then power distribution capability is improved, but output voltage controllability deteriorates when load variations occur
Solution Approach 1:
The patent implements feedback control by monitoring the voltage on the common wiring and using this information to control the switching of power supply to each transformer. The control unit adjusts the power supply state of individual transformers based on the detected common wiring voltage, creating a closed-loop control system that maintains output voltage controllability even when multiple transformers are used simultaneously.
2Reliability
If individual control of each transformer is implemented, then output voltage controllability is improved, but device complexity increases
Solution Approach 1:
The patent merges the control functions by having multiple control windings share a common wiring connection. Instead of providing completely independent control circuits for each transformer, the control windings are connected to a common wiring that carries the reference voltage signal, reducing the number of separate control paths while still enabling individual transformer control through the control switch.
Solution Approach 2:
The common wiring serves multiple functions simultaneously: it acts as a reference voltage source for all control windings, a sensing element for voltage detection, and a control signal distribution medium. This multi-functionality reduces the overall control system complexity while maintaining the ability to individually control each transformer's output voltage.
3Measurement precision
If control windings are connected to ground through separate paths, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The patent combines multiple control wiring paths into a single common wiring that all control windings share. This common wiring is connected to ground through a unified path, reducing the number of separate grounding connections while maintaining voltage detection accuracy. The common wiring acts as a shared reference that all control windings can use simultaneously.
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 configuration reduces variation in output voltages of the transformers, increases controllability, and decreases the number of transformers that are not controlled, thereby preventing excessive or insufficient output voltages.
Implementation Method 1
a plurality of transformers having input windings and cores around which the input windings are wound, the input windings being connected to a DC power supply
Implementation Method 2
at least two of the transformers having control windings magnetically coupled with the input windings via the cores
Data Source
AI summary
An isolated power supply device includes a plurality of transformers having input windings and cores. The input windings are connected to a DC power supply. Output sides of the transformers are connected to power feeding targets. At least two of the transformers have control windings. The isolated power supply device includes a control switch, control wirings, and a common wiring. First terminals of the control windings are connected to the ground. Second terminals of the control windings are connected to first terminals of the corresponding control wirings. Second terminals of the control wirings are connected to the common wiring. The isolated power supply device further includes a control unit that turns on and off the control switch based on a voltage value of the common wiring.