Supercapacitor voltage stabilization at peak load, effectively supporting many devices other than wearable terminals

I am currently working on the design and development of a watch-type wearable terminal.

It is natural to cooperate with smartphones and GPS functions, and to install a plurality of functions such as acceleration sensors and gyro sensors for detecting motion states, heart detectors, and wallet functions, and to work on products for various purposes.

However, it is important that the wearable terminal is small and smart in appearance, so the power supply should be as small as possible, and it is desirable to control it as much as possible in one button battery size. If this is done, the load when using multiple functions at the same time becomes large, and the work may become unstable, and power failure may occur.

At present, the wearable terminal has various types such as a watch type, a glasses type, and a necklace type. The uses are also varied. In order to detect the state of health and the physical state of the body while listening to music, the installation of sensors, and even the products that can be paid by hidden electronic money settlement terminals continue to appear. The combination of multiple functions and miniaturization has long been a prerequisite for wearable terminals, which is a distance that cannot be achieved by designing a limited power supply. If the function is designed in many ways, it will put a lot of load on the battery, making the power supply voltage more unstable. Then the work will be unstable, and there may be a sudden power outage.

Supercapacitor voltage stabilization at peak load, effectively supporting many devices other than wearable terminals

Super capacitors (EDLC/Supercapacitor) play a huge role in solving such problems. By connecting the super capacitor and the battery in parallel, it can suppress the voltage drop and stabilize the operation when the output is large. In other words, "stabilization (average) of the power supply voltage at the peak load" is realized.

Supercapacitors are power storage devices that belong to capacitors. Like other capacitors, it can store and discharge power. However, compared with ceramic capacitors and electrolytic capacitors used in power supply circuits, the capacity is large, and the power is higher than that of a general battery, and the life is long. In addition, the ESR (internal impedance) of Murata's supercapacitors is only a few tens of mΩ, which is extremely small. Less than one-1000th of the ratio compared to conventional cylindrical and button-type supercapacitors. The reason why the voltage drops when the output peak is high is the internal impedance (ESR). The internal impedance is an electrical impedance contained in a power source, an electric meter, or the like, and the voltage drop is proportional to the magnitude of the internal impedance and the amount of current. At a high peak, the amount of current becomes large, so the voltage drop is severe, and if the internal impedance (ESR) becomes small, it can be suppressed. If the ultra-low ESR Murata supercapacitor is connected in parallel with the battery, the internal impedance of the power supply can be made extremely small compared to when only the battery is used. Therefore, as shown in the above figure, the voltage is reduced, and even a multi-functional wearable terminal can work stably. In addition, the stabilization of the power supply voltage at the peak load is also related to the long-time driving and degradation of the battery. Also suitable for long-term use outdoors. Moreover, Murata's supercapacitor is 2.2 to 3.7 mm thin and has a size of only 2.1 cm × 1.4 cm. Whether it is a watch type or a glasses type, the miniaturization and intelligence of the wearable terminal are very important, so the size should be the biggest advantage.

Murata's supercapacitor stabilizes the supply voltage at peak load, effectively supporting many devices other than wearable terminals. For example, support for safety equipment, medical and medical equipment that must work normally and continuously. In addition, it can stabilize the power output of the audio equipment, increase the output and improve the sound quality. This is especially effective in devices that use a power source such as a portable speaker or a portable audio device that has limited battery and USB output.

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