Power Switching Circuit for LCD Residual Voltage Management
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Solution Overview
Problem
Existing power switching circuits for LCDs are complex and costly due to their multi-transistor configuration, which can lead to operational errors if the residual voltage is not properly managed when the power supply is turned back on.
Innovation Solution
A simplified power switching circuit using a 5V DC power supply, an NPN bipolar transistor, a PMOS transistor, and a discharging resistor to manage voltage and reduce current rushes, with a charging capacitor to control the PMOS transistor's switching speed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a multi-transistor configuration is used in the power switching circuit, then the circuit can properly manage residual voltage and prevent operational errors, but the device complexity and cost increase
Solution Approach 1:
The patent extracts and eliminates redundant transistors from the power switching circuit. By analyzing the actual power switching requirements, the invention removes unnecessary transistors while retaining the essential functionality of residual voltage management and operational error prevention, thus simplifying the circuit structure
Solution Approach 2:
The patent makes existing circuit components serve multiple functions. The remaining transistors are designed to handle both power switching and residual voltage discharge operations, eliminating the need for separate dedicated components and reducing overall circuit complexity while maintaining reliability
2Reliability
If a multi-transistor configuration is used in the power switching circuit, then the circuit can properly manage residual voltage, but the manufacturing cost increases
Solution Approach 1:
The patent removes redundant transistors from the circuit design, directly reducing the bill of materials and manufacturing cost. The extraction process maintains essential residual voltage management functionality while eliminating unnecessary components that increase production expenses
Solution Approach 2:
The patent employs a cost-optimized component selection strategy, using fewer and more economical transistors that can reliably perform the required power switching and residual voltage management functions without the need for expensive redundant components
3Productivity
If the power supply is turned on quickly after being turned off, then the productivity improves, but operational errors occur due to residual voltage
Solution Approach 1:
The patent ensures continuous residual voltage management throughout the power switching process. The circuit maintains active residual voltage discharge pathways even during rapid power cycling, allowing quick power-on operations without accumulating harmful residual voltage that would cause operational errors
Solution Approach 2:
The patent incorporates feedback mechanisms that monitor residual voltage levels and automatically adjust the discharge circuit operation. This feedback control enables rapid power switching while preventing operational errors by detecting and managing residual voltage conditions in real-time
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 the complexity and cost of the power switching circuit while effectively managing voltage transitions to prevent operational errors and minimizing current rushes, making it more efficient and reliable.
Implementation Method 1
incorporating a capacitor to regulate voltage transitions
Implementation Method 2
A first switching transistor includes a control electrode connected to the control signal input terminal, a first current conducting electrode connected to the DC power supply via a first bias resistor
Data Source
AI summary
An exemplary LCD (2) includes a control signal input terminal (210) configured for receiving a control signal; an output terminal (220) configured to be connected to a load circuit; a first direct current (DC) power supply (230); a first switching transistor (250) including a control electrode “b” connected to the control signal input terminal, a first current conducting electrode “c” connected to the DC power supply via a first bias resistor, and a second current conducting electrode “e” connected to ground; a second switching transistor (250) including a control electrode “G” connected to the first current conducting electrode of the first switching transistor, a first current conducting electrode “S” connected to the DC power supply, and a second current conducting electrode “D” connected to the output terminal; and a discharging resistor (225) configured to be connected between the output terminal and ground.