Uninterruptible Power Source with Low-Voltage Battery and DC-DC Converter
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Solution Overview
Problem
Conventional uninterruptible power source devices experience significant electric power loss and reliability issues due to the need to raise the voltage of the external power source for charging alkaline secondary batteries, and there is a risk of battery undercharging or failure if the auxiliary power source malfunctions.
Innovation Solution
An uninterruptible power source device with a battery unit having a rated voltage lower than the external power source, a voltage converting device that adjusts voltages to match the difference between the external and battery unit voltages, and a charging and discharging circuit that allows full charging without auxiliary power and efficient power supply during interruptions, with a control device to maintain output voltage stability and diode-or connection for redundancy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the voltage of the external power source is raised by the auxiliary power source to charge the alkaline secondary battery, then the battery can be charged to full capacity, but significant electric power loss occurs
Solution Approach 1:
Instead of raising the external power source voltage to match the battery's required charging voltage, the patent inverts the approach by using a lower-voltage battery (with rated voltage lower than the external power source) and converting the battery voltage upward only when needed for power supply. This eliminates the continuous power loss associated with voltage boosting during charging.
Solution Approach 2:
The patent changes the voltage parameter of the battery unit to be lower than the external power source voltage, fundamentally altering the voltage relationship. This allows the system to charge at the external power source voltage without loss, then use voltage conversion only during discharge to match the required output voltage.
2Reliability
If the auxiliary power source is used to raise the voltage for battery charging, then full charging is achieved, but the system reliability decreases due to potential auxiliary power source failure
Solution Approach 1:
The patent extracts and removes the auxiliary power source component from the charging path. By using a battery with rated voltage lower than the external power source, the system eliminates the need for voltage boosting during charging, thereby removing the auxiliary power source and its associated failure risks from the charging circuit.
Solution Approach 2:
The patent introduces a voltage converting device as an intermediary that operates only during discharge, not during charging. This mediator converts the battery voltage to the required output voltage when power is needed, but is bypassed during charging, reducing its operational burden and failure risk.
3Ease of manufacture
If a battery with rated voltage equal to external power source voltage is used, then charging is simple, but the battery cannot be charged to full capacity
Solution Approach 1:
The patent changes the battery's rated voltage parameter to be lower than the external power source voltage. This parameter change enables full charging capability while keeping the charging circuit simple, as the charging path directly connects the external power source to the battery without requiring voltage conversion during charging.
4Reliability
If the voltage of the external power source is raised during battery charging, then the battery can be fully charged, but the electric power loss increases
Solution Approach 1:
The patent inverts the conventional approach by not raising the charging voltage but instead using a lower-voltage battery that can accept the external power source voltage for charging. The voltage conversion is performed only during discharge to match the required output voltage, dramatically improving energy efficiency.
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 electric power loss and enhances reliability by allowing full charging of the battery unit without auxiliary power and maintaining stable power supply during interruptions, even if the voltage converting device fails.
Implementation Method 1
a voltage converting device that converts a voltage of the battery unit into a voltage equivalent to a difference between the voltage of the external power source and the voltage of the battery unit
Implementation Method 2
a previously charged secondary battery to a loading device for continuing the operation of the loading device
Data Source
AI summary
An uninterruptible power source device 10 in the present invention includes: an input-output terminal 11 that is connected in parallel with a power source line 21 through which electric power is supplied from an external power source 20 to a loading device 30; a battery unit 12 whose rated voltage is lower than a voltage V1 of the external power source 20; a DC/DC converter 13 that converts a voltage V2 of the battery unit 12 into a voltage V3 equivalent to a difference between the voltage V1 of the external power source 20 and the voltage V2 of the battery unit 12; a charging circuit 14 that charges the battery unit 12 through the input-output terminal 11 with the electric power of the external power source 20; and a discharging circuit 15 that performs discharge to the loading device 30 through the input-output terminal 11 at a voltage resulting from adding an output voltage V3 of the DC/DC converter 13 to the voltage V2 of the battery unit 12, at the time of electric power interruption of the external power source 20.