Haptic driver realizes mobile terminal energy consumption reduction scheme
Energy consumption has always been a difficult problem for mobile terminals such as smartphones and tablets. The vibration of mobile phone sound also consumes a certain amount of power. In general, the vibration of a smartphone uses a traditional sub-motor. However, the rotor motor has certain limitations, slow start and slow braking, and there is no directional guidance, and it can not effectively reduce the energy consumption of the mobile terminal.
Linear motors bring good news to mobile device manufacturers
The linear motor makes up for the shortcomings of the rotor motor. Linear motor is also known as linear resonance actuator. Its advantage is that it has a sense of direction during movement. In addition, it has a small size and is more suitable for applications in handheld devices. In fact, in each linear motor, the resonant frequency will be affected by different equipment, application range, displacement distance and temperature. Therefore, the application of linear motors on handheld devices, including the placement of linear motors anywhere in nature, its resonance frequency will vary with the environment and temperature range. How to judge the resonant frequency, this is a place worth exploring.
There is a difficulty in doing hapTIcs, that is, how to realize that the motor can be started when pressed, and can be stopped immediately when it needs to be stopped. The rotor motor cannot achieve this feature. If the LRA of a linear motor is used, the motor can be braked quickly by the resonance frequency of the spring itself. In addition, LRA wants to achieve this kind of braking action, it also needs to determine its resonance frequency before it can be achieved. Therefore, the automatic tracking technology is applied in hapTIcs or in many other applications. The automatic following technology of the linear motor can determine the resonance frequency according to the design of the entire system, so it will be better in consistency and expressiveness.
The advantages of automatic resonance tracking are as follows: automatic detection of LRA resonance frequency, which can support any LRA; when driving in resonance, the power supply current drops by nearly half; LRA braking can only be achieved during automatic resonance tracking. The auto-following system will detect the resonance frequency and match different cores according to different linear motors. No matter what motor you change, its final performance will be ideal.
"The emergence of linear motors has brought the gospel to mobile device manufacturers, becoming the next generation of main products and entering into handheld devices." Xin Benwei, business development manager of Texas Instruments China market development high-performance analog products, believes, "Why do we need brakes If the brake is supported, it will automatically stop at a frequency point soon; if it does not support the brake, it will continue to stop completely after Dangdang, which also has an impact on energy consumption. "
DRV2603 haptic driver reduces power consumption by 60%
There is a difficulty in doing hapTIcs, that is, how to realize that the motor can be started when pressed, and can be stopped immediately when it needs to be stopped. The rotor motor cannot achieve this feature. If the LRA of a linear motor is used, the motor can be braked quickly by the resonance frequency of the spring itself. In addition, LRA wants to achieve this kind of braking action, it also needs to determine its resonance frequency before it can be achieved. Therefore, the automatic tracking technology is applied in hapTIcs or in many other applications. The automatic following technology of the linear motor can determine the resonance frequency according to the design of the entire system, so it will be better in consistency and expressiveness.
The advantages of automatic resonance tracking are as follows: automatic detection of LRA resonance frequency, which can support any LRA; when driving in resonance, the power supply current drops by nearly half; LRA braking can only be achieved during automatic resonance tracking. The auto-following system will detect the resonance frequency and match different cores according to different linear motors. No matter what motor you change, its final performance will be ideal.
"The emergence of linear motors has brought the gospel to mobile device manufacturers, becoming the next generation of main products and entering into handheld devices." Xin Benwei, business development manager of Texas Instruments China market development high-performance analog products, believes, "Why do we need brakes If the brake is supported, it will automatically stop at a frequency point soon; if it does not support the brake, it will continue to stop completely after Dangdang, which also has an impact on energy consumption. "
DRV2603 haptic driver reduces power consumption by 60%
Recently, Texas Instruments launched the first commercial haptic driver DRV2603 for controlling linear resonance actuators and supporting automatic resonance tracking. It is suitable for LRA and ERM and supports automatic resonance tracking. Resonance drive can improve efficiency and reduce power consumption by 60%, that is When driving at the resonance frequency, the current consumption per "g" is reduced by 60%, which can effectively save power.
Automatic resonance tracking technology can provide a haptic effect with twice the driving force. When using a mobile phone, due to the different environment, the temperature inside the mobile phone changes very much, and its resonance frequency will shift. The emergence of haptic drivers will enable the automatic resonance hopping system to automatically track its frequency shift regardless of the environment in which the mobile phone is in the future, thereby providing a consistent low power consumption. For example, under any power supply voltage, a constant vibration intensity can be started. For example, a vibration intensity is set at about 5 volts. When the battery power drops to 3 volts, the vibration intensity itself remains unchanged.
"Compared with devices driven at an ideal frequency, there are no extra devices on the periphery, all of them are integrated inside, and only a bypass capacitor is needed. Compared with competing solutions, the overall size is reduced by 66%. The wide input from 10KHz to 250KHz The input signal processing scheme can be simplified, no scaling is required, and no specific input frequency is required, "Xin Benwei told reporters.
The haptic driver is mainly used in mobile terminals such as mobile phones, tablet computers, portable navigators and portable game control boards. This haptic driver is a small package product, QFN package, with a volume of 2 mm × 2 mm. The small form factor can effectively reduce costs and support a more authentic haptic experience.
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