BLDC Ventilation Feedback Control for Air Flow and Energy Balance
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Solution Overview
Problem
Traditional ventilation apparatuses using brushless DC motors fail to meet Energy Star requirements for both energy efficiency and air flow ratio, as they either exceed air flow limits or increase power consumption when trying to enhance air flow.
Innovation Solution
The implementation of a feedback compensation control system that adjusts the DC power voltage through a voltage compensation unit, using a control unit to compare output current to threshold values and regulate the DC motor speed, allowing operation along optimal curves to meet Energy Star standards.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the air flow of BLDCM is increased, then the air flow performance is improved, but the power consumption is correspondingly increased
Solution Approach 1:
The patent applies dynamics by making the DC power voltage adjustable rather than fixed. The voltage compensation unit dynamically regulates the DC power voltage based on feedback from the control unit, allowing the motor to operate at optimal voltage levels for different air flow requirements, thereby improving air flow performance without proportionally increasing power consumption.
Solution Approach 2:
The patent implements feedback control where the control unit receives signals about the motor's operation status and adjusts the DC power voltage through the voltage compensation unit accordingly. This closed-loop feedback system enables the motor to maintain optimal efficiency by adjusting voltage based on actual performance, resolving the contradiction between air flow and power consumption.
2Productivity
If the DC power voltage is increased to improve air flow, then the air flow performance is improved, but the energy efficiency fails to meet Energy Star requirements
Solution Approach 1:
The patent changes the voltage parameter dynamically through the voltage compensation unit. Instead of operating at a fixed high voltage that compromises energy efficiency, the system adjusts the DC power voltage to optimal levels based on operational needs, thereby achieving required air flow while maintaining energy efficiency that meets Energy Star requirements.
3Productivity
If the ventilation apparatus operates at high power consumption to achieve required air flow, then the air flow requirement is met, but the energy efficiency cannot conform to Energy Star standards
Solution Approach 1:
The system dynamically adjusts the DC power voltage through the voltage compensation unit based on real-time feedback from the control unit. This allows the motor to operate at the minimum necessary power level to achieve required air flow, rather than continuously operating at high power consumption, thereby meeting both air flow requirements and Energy Star energy efficiency standards.
Solution Approach 2:
The feedback control mechanism enables the system to monitor actual performance and adjust voltage accordingly. This ensures the motor operates efficiently at the lowest necessary power consumption level to meet air flow requirements, preventing unnecessary energy waste while maintaining compliance with Energy Star standards.
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 approach enables the ventilation apparatus to achieve the required energy efficiency and air flow ratios by dynamically adjusting the DC power voltage, ensuring minimum energy consumption while maintaining rated speed and air flow, thus conforming to Energy Star standards.
Implementation Method 1
The rectifier 104A is electrically connected to the electromagnetic interference filter 102A to rectify the filtered AC power voltage Vac and output a DC output voltage
Implementation Method 2
The DC converter 108A is electrically connected to the rectifier 104 to receive the DC output voltage and convert energy provided from the AC power voltage Vac to a dc-side load
Implementation Method 3
BLDCM is driven without exciting current because the rotor thereof is composed of permanent magnetic material to produce lower rotation inertia
Data Source
AI summary
A ventilation apparatus with a two-section feedback compensation control and a method for operating the same are disclosed. The ventilation apparatus includes a power conversion unit, a driven circuit, a DC motor, a current-sensing unit, a voltage compensation unit, and a control unit. The power conversion unit receives and converts an AC power voltage into a DC power voltage. The driven circuit receives the DC power voltage and outputs a driven voltage. The DC motor is driven through the driven voltage. The current-sensing unit senses an output current of the DC motor. The control unit receives the output current to compare to a threshold current value, thus controlling the voltage compensation unit. Accordingly, the DC power voltage is adjusted to adjust the speed of the DC motor.