With the popularity of new energy vehicles, as a supporting charging pile for automobiles, it also requires faster charging speed. Charging piles are generally divided into DC charging piles and AC charging piles. DC charging piles are called "fast charging" because of their high power. The requirements of fast charging also put forward higher requirements for the performance of power semiconductors. From high-voltage power conversion to low-voltage safety control scenarios, NMOS has become a key device in the charging pile circuit with its characteristics of high withstand voltage, high current, low on-resistance and fast switching. This paper analyzes the technical advantages of NMOS charging pile from its application scenarios.

Application of NMOS in charging pile

NMOS plays a key role in the charging pile. In high voltage power conversion, it is used as a switch tube of Boost circuit for PFC circuit to improve power factor, and also as a main switch tube in DC-DC conversion. Its low on-resistance, high withstand voltage level and high frequency characteristics improve efficiency, meet protection requirements and help miniaturization. In the charging control and path management, it can receive instructions to switch the charging circuit and power supply, and the low gate driving voltage simplifies the design and supports the two-way flow of energy. In terms of safety protection, it can quickly cope with overvoltage, overcurrent, short circuit and overheating, absorb instantaneous energy and adapt to outdoor environment.

In the battery management system, NMOS can turn on the balancing resistor to discharge the single battery with excessive voltage in the series battery pack, so as to realize capacity balance, provide power for BMS chips and sensors, and realize low power consumption in sleep mode through the load switch. Its low leakage current reduces the static loss of the battery, and its high input impedance ensures the stability of the control signal, helps the charging pile to finely regulate the battery, and improves the charging safety and battery life. It is indispensable for the efficient and stable operation of the charging equipment of new energy vehicles.

Selection guide

When selecting NMOS tube for charging pile, the pressure resistance and efficiency of high voltage scene should be given priority. In the high-voltage power conversion module, PFC and DC-DC circuits need 600V-1200V withstand voltage models (such as HKTD 4N65,650 V withstand voltage) to meet the requirements of bus voltage and surge protection. At the same time, low on-resistance (such as HKTD80N06 is only 8mΩ at 20A) can reduce high-power conversion loss and improve efficiency. High-frequency switching characteristics (nanosecond switching time) are adapted to LLC resonance and other circuits, which reduces the volume of magnetic components and helps the miniaturization of charging piles.

In the charging control and protection, the model with low gate threshold voltage of 2.0-4.0V (such as HKTD5N50) is selected, which is compatible with the driver of the main control chip and simplifies the circuit design. With wide temperature range (-55~+150℃) and high avalanche energy tolerance (such as 250mJ), it can adapt to the harsh outdoor environment, quickly respond to overvoltage and overcurrent faults, and ensure charging safety. Low leakage current (≤100nA) model is required for low-voltage BMS scene, so as to reduce the static loss of battery, ensure the stability of balanced control and power distribution, and give consideration to the performance and reliability of the whole scene.

tag

With the popularization of new energy vehicles, charging piles will develop towards higher power density requirements and two-way energy flow support in the future. With the characteristics of high voltage, high current and high efficiency, NMOS promotes the charging pile from "function realization" to "performance optimization". Under the background of fast charging technology iteration, NMOS will continue to evolve in the direction of higher withstand voltage, lower loss and smarter control, and Heketai will help charging piles move towards the goal of "safety, efficiency and convenience".

company introduction

Heketai, founded in 1992, is a high-tech and specialized new enterprise integrating R&D, design, production and sales of professional components.

Products include:

1. Semiconductor packaging materials; 2. Passive components, mainly including: resistance, capacitance and inductance; 3. Semiconductor discrete devices, mainly including MOSFET, TVS, Schottky, voltage regulator, fast recovery, bridge stack, diode, triode and power device, power management IC and other integrated circuits.

Heketai has two intelligent manufacturing centers:

1. The manufacturing center in South China of China is located in Heketai Science and Technology Intelligent Manufacturing Park, Boluo County, Huizhou City, with a construction area of 75,000 ㎡ and more than 1,000 sets of advanced equipment and testing instruments. It is a local supporting group logistics distribution center, and Dongguan Tangxia Production Center is the current production base;

2. The manufacturing center in the southwest of China is located in Kechuang Center, Shunqing District, Nanchong City, Sichuan Province, with a workshop area of 35,000m2 and about 2,000 advanced equipment and testing instruments;

In 2024, Heketai expanded its product line in an all-round way and established three subsidiaries in Nanchong, Sichuan, namely Shunxin Semiconductor, Nanchong Anhao and Nanchong Jingke, which are mainly responsible for the research and development and production of semiconductor packaging materials; After the product line is broadened, it will meet the needs of customers to the greatest extent.

Heketai adheres to the business policy of customer first, quality first, innovation-driven and people-oriented, and provides customers with one-stop application solution services. At the same time, Heketai provides comprehensive services such as OEM OEM OEM for semiconductor chip and discrete device packaging and testing.

Heketai has accumulated rich core technology reserves in integrated circuit design, chip testing, discrete device process design and reliability experiments, and has more than 100 national invention patents and utility model patents.

Heketai has passed ISO9001, ISO14001 and IATF16949 system certification.

Products are widely used in power supply, lighting, medical electronics, small household appliances, communications, security instruments, industrial control, automotive electronics and other fields.

Sweep and contact Heketai.

Sales Tel: 18823438533 (WeChat with the same number)

Landline: 0755-82565333

Email: hkt@heketai.com.