Summary: The power supply is the heart of the electronic device, and its quality directly affects the reliability of the electronic device. With the continuous development of electronic technology, the requirements of power consumption, volume and conversion efficiency continue to increase, and switched capacitor technology has been widely used in power supplies. The frequency of the switching power supply should be high, so that the dynamic response can be fast, and it is necessary to work with the high-speed microprocessor, and it is also an important way to reduce the volume. The volumetric weight of an electrical product is inversely proportional to the square root of its power supply frequency. Therefore, when the frequency is increased from the power frequency of 50 Hz to 20 kHz, the volumetric weight of the electrical equipment is substantially reduced to (5 to 10)% of the power frequency design. Since the power MOS tube has the characteristics of fast opening and closing, and meets the requirements of high-speed switching action, this is the basic reason for the significant benefit brought by the switching power supply to achieve frequency conversion. The single-chip switching power supply adopts the charge pump technology to control the charge and discharge of the capacitor through the power MOS tube to realize the voltage conversion, thereby greatly reducing the power supply volume, improving the conversion efficiency, having high integration, high cost performance, the simplest peripheral circuit, and the most Good performance indicators and other advantages, generally speaking, its weight is 1/4 of the linear power supply, the volume is 1/3. Based on the basic principle of charge pump [1], this paper designs and develops a negative voltage charge pump, analyzes its working principle in detail, and puts forward the switch speed, power consumption and conversion rate based on the basic model. Certain improvements. See PDF document for details. Z10 Bone Conduction Earphone,Wireless Bluetooth Air Conduction Headphone,Wireless Headset Bone Conduction,Wireless Bluetooth Headphone Shenzhen Lonfine Innovation Technology Co., Ltd , https://www.lonfinesmart.com