Under Voltage Protection Device Using Variable Resistor
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Solution Overview
Problem
Existing under voltage protection devices are complex, costly, and not adaptable to varying input voltages due to their use of numerous electronic components and fixed resistance voltage dividers.
Innovation Solution
An under voltage protection device with a simplified design using a diode, variable resistor, transistor, and fixed-resistance resistor, allowing for adjustable resistance to accommodate different voltage sources, comprising a voltage detector and starting unit that controls the operation based on voltage thresholds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a voltage divider with fixed resistance resistors is used, then the voltage detection function is achieved, but the device cannot be adapted to input voltages of different amounts
Solution Approach 1:
The patent replaces fixed resistance resistors with a variable resistor that can be adjusted to adapt to different input voltage magnitudes. This dynamic adjustment capability allows the voltage detection device to function across a range of voltage levels, directly resolving the contradiction between adaptability and device complexity.
2Reliability
If considerable amount of electronic components are used, then the voltage detection and control function is achieved, but the device is difficult to manufacture and cost increases
Solution Approach 1:
The patent extracts and eliminates unnecessary electronic components from the voltage detection circuit, retaining only the essential elements (variable resistor, Zener diode, comparator, and switches) needed for reliable voltage detection and control. This simplification maintains detection reliability while significantly improving ease of manufacture and reducing cost.
Solution Approach 2:
The patent designs the voltage detection device with multi-functional components that perform multiple roles. For example, the Zener diode provides both voltage reference and protection functions, while the comparator handles both threshold detection and control signal generation. This universality reduces the total component count while maintaining reliable operation.
3Adaptability or versatility
If fixed resistance resistors are used in voltage divider, then the circuit is simple, but the protection device cannot protect against varying voltage sources
Solution Approach 1:
The patent introduces a variable resistor that can be dynamically adjusted to match different voltage source magnitudes. This dynamic element allows the device to adapt to varying voltage sources while maintaining simple operation through straightforward adjustment mechanisms.
Solution Approach 2:
The patent changes the resistance parameter of the voltage divider circuit by using an adjustable variable resistor instead of fixed resistance values. This parameter change enables the circuit to accommodate different voltage sources while keeping the overall device structure and operation simple.
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 reduces manufacturing complexity and cost, enabling the device to protect electric equipment from varying voltage sources while extending equipment life and allowing for adaptation to various voltage magnitudes.
Implementation Method 1
the diode has an input electrically connecting with the external voltage source and an output... when a voltage of the external voltage source is smaller than a voltage of the diode
Implementation Method 2
the first transistor has a collector node electrically connecting with the first node of the variable resistor and the ground, an emitter node and a base node electrically connecting with the second node of the variable resistor... when the voltage of the external voltage source is larger than the voltage of the diode, the voltage between the emitter node and the collector node is larger than a threshold voltage
Data Source
AI summary
An under voltage protection device includes a voltage detector and a starting unit. The voltage detector includes a diode, a variable resistor, a transistor and a fixed-resistance resistor. The starting unit includes a second transistor. When a voltage of the external voltage source is smaller than a voltage of the diode, a voltage between an emitter node and an collector node of the first transistor is smaller than a threshold voltage present between a gate node of and a source node of the second transistor such that the starting unit is turned off. When the voltage of the external voltage source is larger than the voltage of the diode, the voltage between the emitter node and the collector node is larger than the threshold voltage present between the gate node and the source node such that the starting unit is turned on.