Soft-Switching Control Circuit for DC Motor State Change
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Solution Overview
Problem
Existing soft switching control circuits for DC motors lack flexibility in adjusting the state change time, leading to inefficiencies such as idle currents and instability due to fixed adjusting time periods, which do not account for variations in motor parameters like coil current and rotation speed.
Innovation Solution
A soft switching control circuit that includes an absolute value generating circuit, a threshold voltage generating circuit, and a comparing circuit to dynamically adjust the state change time based on actual motor conditions, using Hall signals and end voltages to generate an adjusted state change signal for optimal switching control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a fixed adjusting time period is used for soft switching control, then the control circuit structure is simple, but the control flexibility and adaptability to motor parameter variations are poor
Solution Approach 1:
The patent implements dynamic adjustment of the adjusting time period based on real-time motor operating conditions. The control circuit continuously monitors motor parameters and dynamically modifies the adjusting time period to match current operating conditions, transforming the fixed-time control into an adaptive dynamic control system that responds to changing motor states.
Solution Approach 2:
The patent changes the controlling parameter from a fixed time value to a dynamically adjustable time period based on motor operating parameters. By monitoring motor current, speed, and other parameters, the system adjusts the adjusting time period accordingly, enabling the control to adapt to different operating conditions such as startup, steady-state, and overload scenarios.
2Loss of energy
If the adjusting time period is increased to reduce idle current, then idle current is reduced, but a significant time gap with no coil current is generated affecting motor stability
Solution Approach 1:
The patent dynamically adjusts the adjusting time period based on real-time motor operating parameters such as current and speed. During startup or high-load conditions, a longer adjusting time period is used to reduce idle current, while during steady-state operation, the time period is shortened to maintain continuous coil current and ensure motor stability, thus optimizing both energy efficiency and operational stability.
Solution Approach 2:
The patent applies different adjusting time period values for different operating conditions and phases of motor operation. Instead of using a uniform time period, the system selects appropriate time period values based on the specific operating context, such as startup phase, steady-state phase, or overload phase, thereby optimizing performance for each specific condition.
3Stability of the object's composition
If the adjusting time period is decreased to maintain continuous coil current, then motor stability is improved, but the soft switching control purpose cannot be fulfilled and idle current increases
Solution Approach 1:
The patent implements parameter-based dynamic adjustment where the adjusting time period is modified according to motor operating parameters. The system monitors parameters such as motor current, speed, and load conditions, and automatically adjusts the time period to balance the need for continuous coil current (for stability) with the need to minimize idle current (for energy efficiency).
Solution Approach 2:
The control system transitions from static fixed-time control to dynamic adaptive control, where the adjusting time period continuously adapts to changing motor operating conditions. This dynamic adjustment enables the system to maintain optimal performance across varying loads and operating phases, reducing idle current during appropriate phases while ensuring stability when needed.
4Device complexity
If fixed threshold voltage is used for state change detection, then the detection is simple, but the detection accuracy and adaptability to actual state change time are poor
Solution Approach 1:
The patent implements dynamic threshold voltage adjustment based on motor operating conditions. Instead of using a fixed threshold voltage, the system modifies the threshold voltage according to parameters such as motor current, speed, and operating phase. This dynamic thresholding improves the accuracy of state change detection by adapting to varying operating conditions, enabling more precise identification of actual state change times.
Solution Approach 2:
The system incorporates feedback mechanisms where the detected state change information is used to adjust subsequent detection parameters. The control circuit monitors motor operating parameters and uses this feedback to dynamically adjust the threshold voltage for state change detection, creating a closed-loop detection system that continuously optimizes detection accuracy based on actual motor behavior.
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 adapts the switching time to match the motor's actual conditions, reducing idle currents and enhancing the stability and efficiency of the DC motor operation by eliminating the limitations of fixed adjusting time periods.
Implementation Method 1
a pair of Hall signals from the DC motor
Implementation Method 2
the magnetic field generate by the motor coil
Data Source
AI summary
A soft switching control circuit for a DC motor is provided. The soft switching control circuit has an absolute value generating circuit, a threshold voltage generating circuit, and a comparing circuit. The absolute value generating circuit outputs an absolute value signal according to a pair of Hall signals from the DC motor. The threshold voltage generating circuit receives a detected state signal and at least an end voltage of a coil of the DC motor for determining a current on the coil at an actual state change time defined by the detected state signal. According to the determination, the threshold voltage generating circuit outputs a threshold voltage with an adjusted voltage level. The comparing circuit compares the absolute value signal and the threshold voltage so as to generate a state change adjusting signal for modifying the actual state change time.