Motor Controller Multifunction Port PWM Control
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Solution Overview
Problem
Existing motor controller circuits face challenges in efficiently controlling motor speed, maintaining speed over voltage variations, and managing motor states like sleep and braking, particularly in brushless motor applications where continuous high current is undesirable.
Innovation Solution
A motor controller circuit with a PWM control circuit, H-bridge circuit, and multifunction port that allows for speed control through pulse-width modulation, sleep mode, and reverse rotation, using a control logic circuit to manage duty cycles and transistor operations to reduce current and prevent short circuits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If a 100% duty cycle motor signal is used to achieve fastest motor speed, then motor acceleration is maximized, but current consumption increases and continuous high current is undesirable
Solution Approach 1:
The patent applies periodic action by using pulse-width modulation (PWM) to switch the motor signal on and off rapidly. Instead of maintaining continuous 100% duty cycle, the controller uses periodic pulses with varying duty cycles to achieve desired motor speeds while reducing average current consumption. The H-bridge circuit enables this periodic switching by controlling transistor pairs to create PWM waveforms that drive the motor coil.
2Adaptability or versatility
If multiple separate control circuits are used for sleep mode, brake mode, and PWM control, then each function can be optimized independently, but device complexity increases
Solution Approach 1:
The patent merges multiple control functions into a single integrated controller circuit. The H-bridge circuit and control logic are combined to simultaneously handle sleep mode, brake mode, and PWM speed control functions. This integration reduces the number of separate control circuits needed while maintaining full functional capability, thereby reducing device complexity without sacrificing adaptability.
Solution Approach 2:
The controller circuit is designed with multi-functionality to perform various motor control operations through a single unified system. The same H-bridge circuit and control logic that manage PWM speed control also handle sleep mode transitions and braking operations, making the device universal in its control capabilities rather than requiring specialized circuits for each function.
3Measurement precision
If rapid switching of transistor pairs is used to control motor speed, then motor speed control precision is improved, but risk of short circuits increases
Solution Approach 1:
The patent applies beforehand cushioning by implementing protective circuitry and control logic that prevents short circuits before they can occur. The controller monitors transistor switching states and prevents simultaneous conduction of opposing transistor pairs that would cause short circuits. This protective mechanism is built into the control logic itself, cushioning against potential failures before they happen while enabling rapid switching for precise speed control.
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 enables precise motor speed control, maintains speed consistency over voltage variations, and efficiently manages motor states, reducing current consumption and preventing motor stalling, thereby improving motor performance and energy efficiency.
Implementation Method 1
The speed of the motor may be determined from a rotor commutation signal that is generated by converting the magnetic field generated by a rotating motor element, such as an alternating pole ring magnet, to an electrical signal with the use of a magnetic field-to-voltage transducer, such as a Hall effect element.
Data Source
AI summary
In one aspect, a control circuit to control a speed of a motor includes a control logic circuit connected to a multifunction port. The control logic circuit is configured to receive a control signal provided at the multifunction port and to provide response signals based on the control signal to place the motor in at least two of a sleep mode, a brake mode and a pulse-width modulation (PWM) mode. The motor control circuit also includes an H-bridge circuit configured to control the motor based on the response signals.