Power Supply Frequency Control for Voltage Abnormality
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Solution Overview
Problem
Existing power supply devices with voltage detection circuits on the primary side for alternating voltage input face challenges in reducing size and cost, and they struggle to maintain stability under varying power supply conditions across different countries and environments.
Innovation Solution
A power supply device with a transformer having an insulated primary and secondary side, utilizing a switching element, control unit, and setting unit to control the driving frequency, sets an upper limit driving frequency to manage abnormal input voltages by restricting the load and preventing device failure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a voltage detection circuit is provided on the primary side for detecting abnormal alternating voltage, then the power supply device can detect voltage abnormalities, but the device size and cost cannot be further reduced
Solution Approach 1:
The patent combines the voltage detection function with the existing control unit by having the control unit detect abnormality of input alternating voltage directly, rather than using a separate dedicated detection circuit. This integration eliminates the need for additional detection hardware, thereby reducing device size and cost while maintaining voltage abnormality detection capability.
Solution Approach 2:
The control unit is designed to perform multiple functions including both controlling the switching element and detecting voltage abnormalities. By making the control unit universal and multi-functional, the patent eliminates the need for separate dedicated detection circuits, thus reducing overall device complexity, size, and cost.
2Adaptability or versatility
If the power supply device operates in various countries with different power supply circumstances, then the device can be used globally, but stable supply of alternating voltage is not guaranteed in some environments
Solution Approach 1:
The control unit continuously monitors the input alternating voltage for abnormalities and adjusts its control of the switching element based on detected conditions. This feedback mechanism enables the power supply device to adapt to varying power supply circumstances in different countries, maintaining reliable operation even when input voltage stability cannot be guaranteed.
Solution Approach 2:
The control unit dynamically adjusts the driving frequency of the switching element based on detected voltage conditions. By making the operating parameters dynamic and adaptable rather than fixed, the power supply device can respond to different power supply environments encountered in various countries, ensuring stable operation despite external voltage variations.
3Productivity
If the driving frequency of the switching element is increased to improve power conversion efficiency, then the output power can be optimized, but device failure may occur under abnormal input voltage conditions
Solution Approach 1:
The control unit performs preliminary detection of input voltage abnormality before operating the switching element at high frequencies. By detecting voltage conditions in advance and preventing operation under abnormal conditions, the patent avoids device failure while still allowing high-frequency operation for efficient power conversion under normal conditions.
Solution Approach 2:
The control unit takes preliminary anti-action by preventing the switching element from operating under abnormal input voltage conditions. By blocking high-frequency operation when voltage abnormalities are detected, the patent protects against device failure while maintaining the ability to achieve high power conversion efficiency when voltage conditions are normal.
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 effectively addresses the issue of abnormal input voltages by maintaining stable output voltage and preventing device failure, while reducing the device's size and cost through efficient frequency control.
Implementation Method 1
a transformer in which a primary side and a secondary side are insulated, thereby converting a voltage input to the primary side, and supplying a voltage output to the secondary side
Data Source
AI summary
A power supply device controls a driving frequency of a transformer in which a primary side and a secondary side are insulated, thereby converting a voltage input to the primary side, and supplying a voltage output to the secondary side to a load. The power supply device includes a control unit, a switching element, and a setting unit. The control unit is configured to control operation of the switching element for driving the primary side of the transformer. The setting unit is configured to set an upper limit driving frequency of a driving frequency of the switching element. In a case where a voltage to be input to the primary side is higher than a rated input voltage, the control unit controls the operation of the switching element to perform driving by using the upper limit driving frequency as the driving frequency of the switching element.