Flat Motor Drive Circuit Using Boost Voltage for Fast Startup
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Solution Overview
Problem
Flat motors in electronic devices take a long time to start, which affects user experience due to their slow initiation.
Innovation Solution
A flat-motor driving method and drive circuit that uses a processor and voltage processing circuit to provide a forward voltage exceeding the rated voltage initially for quick starting and a reverse voltage for quick stopping, utilizing a boost circuit and voltage stabilizing circuit to accelerate motor startup and braking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If a rated voltage is used to start the flat motor, then the motor operates safely within its voltage limits, but the starting time is long and the motor cannot be quickly started
Solution Approach 1:
The patent applies preliminary action by pre-charging a capacitor to a voltage higher than the rated motor voltage before startup. When the motor needs to start, this pre-charged capacitor immediately discharges through the motor, providing a high starting voltage that accelerates the motor's startup process. This preliminary energy storage resolves the contradiction by enabling quick startup without requiring a continuous high-voltage power supply during normal operation.
Solution Approach 2:
The patent implements periodic action through a control circuit that periodically charges and discharges the capacitor. The capacitor is charged during idle periods when the motor is not running, and then discharged in brief periodic pulses when startup is required. This periodic charging/discharging cycle allows the system to maintain readiness for quick startup while operating within safe voltage limits during normal operation.
2Loss of time
If a high forward voltage is applied to accelerate motor starting, then the starting time is reduced, but the motor may be damaged if the voltage exceeds its maximum bearing capacity
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting the voltage parameter delivered to the motor. The circuit uses a capacitor that can be charged to different voltage levels and discharged in controlled amounts, thereby changing the voltage parameter from a static rated value to a dynamic value that can exceed the rated voltage temporarily during startup but remains within safe limits. This resolves the contradiction by enabling high-voltage startup acceleration while maintaining motor reliability through controlled parameter variation.
Solution Approach 2:
The patent implements partial or excessive action by applying a voltage that temporarily exceeds the motor's rated voltage during the startup phase, but only for a limited duration and to a limited extent. The capacitor discharge provides an excessive voltage boost just enough to accelerate startup, then transitions back to normal rated voltage operation. This partial excessive action achieves faster startup without causing damage, as the overvoltage is applied only partially in time and magnitude.
3Force
If the flat motor is designed for strong vibration performance, then the vibration alerting function is effective, but the starting time becomes longer affecting user experience
Solution Approach 1:
The patent applies preliminary action by pre-storing energy in the capacitor at a voltage level higher than the rated motor voltage. This preliminary energy preparation allows the motor to receive an immediate high-voltage pulse when startup is triggered, accelerating the startup of the vibration mechanism. The strong vibration force is achieved through the high initial voltage pulse, while the starting time is reduced because the energy is already prepared and immediately delivered.
Solution Approach 2:
The patent uses parameter changes by varying the voltage parameter delivered to the motor based on operational requirements. During startup, the voltage parameter is temporarily increased above the rated level to accelerate motor initiation and enable strong vibration. Once the motor is running, the voltage parameter returns to the normal rated level for sustained operation. This dynamic parameter adjustment resolves the contradiction between achieving strong vibration force and reducing starting time.
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 significantly reduces the starting and stopping times of flat motors, improving user experience by making them start and stop more quickly.
Implementation Method 1
a boost circuit and a first circuit, and the boost circuit and the first circuit are connected in parallel; and the boost circuit is configured to output the first working voltage V1 in the first time period
Implementation Method 2
a first capacitor C1, a first resistor R1, and a boost chip, where a first end of the first capacitor C1 is connected to the processor, and is used to receive the first triggering instruction sent by the processor; a second end of the first capacitor C1 is grounded by using the first resistor R1
Implementation Method 3
the first circuit includes a voltage stabilizing circuit and a first unidirectional conduction circuit that are connected in series
Data Source
AI summary
An electronic device includes a signal trigger circuit, a flat-motor drive circuit, and a flat motor. The signal trigger circuit sends a starting instruction to the flat-motor drive circuit for instructing to start the flat motor. A processor of the flat-motor drive circuit sends a first triggering instruction to a voltage processing circuit of the flat-motor drive circuit after receiving the starting instruction. The voltage processing circuit provides a first working voltage V1 to the flat motor after receiving the first triggering instruction, and provides a second working voltage V0 to the flat motor after a first time period. V0<V1≤V2, V0 is a rated voltage value of the flat motor, and V2 is a maximum forward voltage value that the flat motor can bear when the flat motor is started.