Fan Drive Circuit Using Bus Voltage Detection for DC Speed Control
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Solution Overview
Problem
Existing fan drive systems using alternating current motors are large and power-consuming, and switching to a direct current motor drive system requires new modules and materials, complicating speed regulation and increasing costs.
Innovation Solution
A fan drive system comprising an AC power supply, filter unit, rectifier unit, bus capacitor, switching power supply, and direct current motor drive unit, with a speed regulation switch between the AC power supply and filter unit, and a bus voltage isolation detection circuit to regulate the direct current motor, allowing for speed control without replacing existing modules.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If an alternating current motor is used for fan drive, then the motor can be directly driven by alternating current with simple speed regulation, but the motor size is large and power consumption is high
Solution Approach 1:
The patent replaces the traditional alternating current motor with a direct current motor drive system. This substitution enables lower power consumption and smaller motor size while maintaining fan operation through electronic control components including rectifier, filtering, and switching circuits that convert AC power to controlled DC power for the motor
Solution Approach 2:
The patent implements speed regulation by changing electrical parameters through a switching controller that adjusts duty cycle and timing. This allows continuous speed control of the direct current motor without mechanical adjustments, resolving the contradiction between energy efficiency and control complexity
2Use of energy by moving object
If a direct current motor drive system is adopted, then power consumption is reduced and motor size is reduced, but new modules and materials are required and existing materials cannot be used
Solution Approach 1:
The patent designs the switching controller and associated circuits to perform multiple functions: rectification, filtering, voltage regulation, and speed control. This multi-functionality reduces the number of separate components needed, allowing the system to achieve DC motor drive efficiency while minimizing the need for entirely new modules by integrating functions into existing circuit architectures
3Use of energy by moving object
If a direct current motor drive system is adopted, then power consumption is reduced and motor size is reduced, but speed regulation becomes complicated with more switches and systems
Solution Approach 1:
The patent implements dynamic speed regulation through a switching controller that continuously adjusts the duty cycle and timing parameters. This dynamic control approach allows smooth speed variation without mechanical switches or complex mechanical adjustment mechanisms, resolving the contradiction between energy efficiency and operational simplicity
Solution Approach 2:
The patent incorporates feedback mechanisms in the switching controller that monitor motor operation and automatically adjust control parameters. This feedback control simplifies operation by eliminating manual adjustments while maintaining optimal performance across different speed settings, addressing the complexity issue in speed regulation
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 solution enables efficient power use, reduces motor size, simplifies speed regulation, and maintains compatibility with existing materials, resulting in a cost-effective and reliable direct current motor drive system for fans.
Implementation Method 1
a rectifier unit, wherein an input end of the rectifier unit is connected to an output end of the filter unit
Implementation Method 2
a filter unit, wherein an input end of the rectifier unit is connected to an output end of the filter unit
Implementation Method 3
a switching power supply, wherein an input end of the switching power supply is connected to an output end of the rectifier unit
Data Source
AI summary
The present disclosure relates to a fan drive system and a fan. The fan drive system comprises an AC power supply, a filter unit, a rectifier unit, a bus capacitor, a switching power supply, a bus voltage isolation detection circuit and a DC motor drive unit. Wherein a speed regulation switch is provided between the AC power supply and the filter unit having an output end connected to an input end of the rectifier unit with an output end connected to an input end of the switching power supply. The circuit is configured to detect voltages at two ends of the bus capacitor, an output end of the switching power supply is connected to the DC motor drive unit for supplying power, and an output end of the circuit is connected to the DC motor drive unit for inputting speed regulation signals. The DC motor drive unit is connected to a DC motor for driving the DC motor.