Voltage Divider Driving Circuit for Fan Speed Control
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Solution Overview
Problem
Existing driving circuits in electronic apparatuses often lack PWM signal generators, limiting their ability to adjust driving voltages for load circuits such as DC fan motors or LEDs, which restricts control over operating parameters like speed or brightness.
Innovation Solution
A driving circuit comprising a voltage-divider circuit and a converting circuit that receives multiple control signals, divides their voltages to generate a first voltage, and converts it into a driving voltage, allowing for adjustment of load circuit operations without relying on PWM signals by switching between logic high, low, and high impedance potentials.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If PWM signal generators are not installed to reduce hardware costs, then hardware cost is reduced, but the ability to adjust driving voltage values is lost
Solution Approach 1:
The patent introduces a voltage-divider circuit as an intermediary component that receives control signals and generates multiple driving voltage values through voltage division. This mediator enables voltage adjustment functionality without requiring a complex PWM signal generator, thus resolving the contradiction between hardware cost reduction and driving voltage adjustment capability
Solution Approach 2:
The patent creates a simplified version of PWM functionality by using a voltage-divider circuit that copies the essential voltage adjustment capability without implementing the full PWM signal generation mechanism. This allows the system to achieve similar control objectives through a different, more cost-effective approach
2Adaptability or versatility
If a voltage-divider circuit is used to generate multiple driving voltage values, then driving voltage adjustment capability is improved, but device complexity increases
Solution Approach 1:
The voltage-divider circuit is designed to perform multiple functions: it receives control signals, generates multiple driving voltage values, and adapts to different load requirements. This multi-functionality reduces the need for additional dedicated components, thereby limiting the increase in overall device complexity while maintaining versatile voltage adjustment capability
Solution Approach 2:
The patent adjusts voltage output by changing the division ratio parameters of the voltage-divider circuit rather than changing the fundamental circuit structure. This parameter-based adjustment method enables versatile voltage control while keeping the circuit topology simple and manageable
Data Source
AI summary
A driving circuit and an electronic apparatus having the same are provided. The electronic apparatus includes a load circuit and the driving circuit. The driving circuit is coupled to the load circuit. The driving circuit includes a voltage-divider circuit and a converting circuit. The voltage-divider circuit is configured to receive N control signals and divides voltages of the N control signals to generate a first voltage, wherein N is an integer greater than or equal to two. The converting circuit is coupled to the voltage-divider circuit to receive the first voltage, converts the first voltage into a driving voltage, and drives the load circuit according to the driving voltage.