Overview of power supply applications in the power industry

Multiple Power Supplies

Technology Application Introduction

What are the core competencies of a charging pile power module enterprise!

1  Technological innovation capability

R&D capability: the enterprise should have strong R&D capability, including but not limited to hardware development, software programming, system integration and so on. This helps the enterprise to continuously introduce new technologies and products to meet the market demand and industry development trend.

Technical standards development: actively participate in the development of industry standards, or introduce enterprise standards higher than the industry standards to ensure leading product quality and performance.

2  Product development capability

Diversified product development: the enterprise should be able to develop charging modules and charging piles that are suitable for different car models and different application scenarios (e.g. household, commercial, public, etc.).

Personalized customization: Provide customized product development services according to the specific needs of customers to meet specific use scenarios and technical requirements.

3  Quality Management Capability

Quality management system: Establish a sound quality management system, such as ISO 9001, to ensure that the products comply with quality standards in all aspects of design, production and testing.

Strict quality control: Strict quality control measures are implemented during the production process, including raw material procurement, production process monitoring, finished product inspection, etc., to ensure the stability and consistency of product quality.

4  Market Adaptability

Market research: conduct regular market research to understand market dynamics, user needs and technology development trends, in order to adjust product strategy and market layout in a timely manner.

Flexible market response: able to respond quickly to market changes, such as price fluctuations, policy adjustments, competitors' strategies, etc., in order to maintain market competitiveness.

5  Cost control ability

Cost optimization: Achieve production cost optimization by improving the production process, increasing the utilization rate of raw materials, and reducing labor costs.

Supply Chain Management: Strengthen cooperation with upstream suppliers and downstream customers to reduce operating costs through large-scale procurement and sales.

6  After-sales service capability

Perfect after-sales service system: establish an after-sales service system covering the whole process of pre-sales consultation, installation and commissioning, and after-sales service, and provide timely and effective technical support and maintenance services.

User training and support: provide users with necessary training and support to help them better understand and use the products and improve user experience.

7  Intellectual Property Protection Capability

Patent application and protection: Actively apply for patents, trademarks, copyrights and other intellectual property rights to protect the enterprise's technology and products from infringement.

Intellectual property litigation and defense: When facing intellectual property disputes, we are able to effectively conduct litigation and defense to protect the legitimate rights and interests of the enterprise.

8  Resource Integration Capability

Industry chain upstream and downstream cooperation: Strengthen cooperation with enterprises upstream and downstream of the industry chain to integrate resources and form competitive advantages.

Cross-field cooperation: cooperate with enterprises in other industries or fields to jointly develop new products or markets and realize resource sharing and mutual benefit.

In short, the core competence of charging pile power module enterprises not only includes traditional aspects such as technological innovation, product development and quality management, but also includes key elements of modern enterprise competition such as market adaptation, cost control, after-sales service, intellectual property protection and resource integration. By continuously improving these core competencies, enterprises can gain long-term competitive advantages in the field of charging pile.

Relay Protection

Relay protection is an important protection measure in the power system, and its main function is to quickly and accurately detect faults in the event of a fault or abnormal operation of the power system and to protect the safe operation of the power system by disconnecting the faulty circuit. The following are some basic concepts and classifications of relay protection:

1  Basic Principle

Relay protection device usually consists of measurement part, logic part and execution part:

1) Measuring part: detect the current, voltage, frequency and other parameters of the power system, and compare them with the set rectification value.

2) Logic part: According to the information provided by the measurement part, it determines whether the system is faulty or not, and determines whether it is necessary to issue a trip command or not.

3) Execution part: Execute the tripping command issued by the logic part, and cut off the faulty circuit through the circuit breaker and other equipment.

2  Classification

Relay protection can be categorized according to different criteria and functions:

1) Classified according to the protection object:

Line protection: protects transmission lines from damage caused by short circuits and overloads.

Transformer protection: protects transformers from damage caused by short circuits, overloads, temperature rise and other problems.

Generator protection: protects generators from damage caused by short circuits, over-voltage, over-current and other problems.

Busbar protection: protects the busbar system from damage caused by short circuits and ground faults.

2) Classified according to the protection principle:

Overcurrent protection: when the current exceeds the set value, the protection device operates.

Distance protection: act according to the distance from the fault point to the protective device.

Differential protection: comparing the difference of current between two ends of the circuit, when the difference exceeds the set value, the protective device operates.

Direction protection: Judge the fault location according to the direction of current.

Over-voltage protection: When the voltage exceeds the set value, the protective device will act.

3) Categorized according to operating characteristics:

Instantaneous action protection: Once the fault is detected, it will act immediately.

Delayed action protection: After detecting the fault, it will act after a certain delay.

 3  Characteristics

The relay protection system should have the following characteristics:

1) selectivity: only remove the faulty part, without affecting other parts of the system.

2) rapid action: rapid removal of faults, reduce the damage to the system.

3) Reliability: the protection device should act reliably, without false action or refusal.

4) Sensitivity: within the specified protection range, there is enough response ability to the fault.

 4  Application

Relay protection is widely used in various power systems, including transmission systems, distribution networks, power plants, industrial power systems, etc. It is an important means to ensure the safe and stable operation of power systems. With the development of technology, relay protection devices are becoming more and more intelligent, capable of realizing more complex protection functions and higher protection performance.

Application of Modular Power Supply in Charging Pile

Modular power supply in AC charging pile

Modular power supply in AC charging pile - working application logic diagram:

Product application scenarios and solutions of modular power supply in AC charging pile--Application diagram of modular power supply in charging pile.

Modular power supply in AC charging pile product application scenarios and solutions - AC charging pile power supply circuit part of the main existing technical requirements

1) the above application program in addition to the main power supply set together, its CP control signal unit needs ± 12V to amplify power supply to the op-amp, requiring high isolation of input and output, some customers will use TI's isolation chip to achieve the output of ± 12V supply, due to the recent imports of some semiconductor crystals are out of stock serious delivery time is long, the price soared, the reliability of the input and output isolation voltage do not do high, for the These defects, can use our FN1-12D12B3N micropower modules to achieve high isolation output power supply, isolation voltage up to 3000VDC, effectively avoiding the pulse group and lightning, static electricity and other interference.

2)The charging pile industry has very high EMC level requirements (specific implementation of standards IEC61000-4-5, IEC61000-4-2, IEC61000-4-4), the input front-end design of an ordinary filter circuit is difficult to ensure that 100% to meet its requirements, with our high immunity to interference with the EMC filter module LC-AC01F2/LC-AC01P2 can meet the fourth level of EMC filter module LC-AC01F2/LC-AC01P2 can meet the fourth level of EMC filter module. AC01P2 can meet the requirements of the fourth level, and at the same time can solve the customer drawing board layout and material selection, maintenance and debugging troubles.

3)The complexity of the charging pile grid environment, mainly reflected in the voltage fluctuation, lightning surge level is high, easy to cause capacitance bulging, rectifier diode cracking phenomenon. The control relay of the main control board of the charging pile will generate high pulse voltage during the process of shutting down and closing, which will easily cause damage to the components at the output end of the module. Our company has made effective input precautions against the complexity of the application environment of the charging pile and improved the input voltage range, which greatly reduces the probability of the product to be abnormal due to the surge voltage.

Modular power supply in DC charging pile application

Modular power supply in DC charging pile application--Working application logic diagram

Modular power supply in the DC charging pile product application scenarios and solutions - charging pile modular power supply application diagram

Modular power supply in DC charging pile application - DC charging pile power circuit part of the technical requirements and working principle

The input voltage of DC charging pile is three-phase 380VAC (147-457VAC), the frequency is 50Hz, the output is adjustable from 250-950VDC, and the DC output is directly used to charge the power battery of the electric vehicle. It can provide large enough power, with a wide range of output voltage and current adjustment, suitable for passenger cars and buses, and can realize fast charging.

DC charging pile working principle: the three-phase 380V AC power of utility power enters into the three-phase four-wire power meter after EMC and other lightning protection filter modules, and the three-phase four-wire power meter monitors the actual charging power of the whole charging machine when it is working. Usually the power of charging pile is 11KW, 60KW, 120KW, etc., and the power of single charger is often 60KW, therefore, according to the actual charging current and charging voltage, the charger often needs to be connected in parallel to increase the power to use, which requires that the charger has the function of equalizing the current output, and the output of the charger is directly charged to the power battery through the charging gun. When the DC charging pile is working, the auxiliary power supply provides power to the main control unit, display unit, protection control unit, signal acquisition unit, card reading unit, relays and other control systems. In addition, during the charging process of the power battery, the auxiliary power supply provides power to the BMS system, which monitors the status of the power battery in real time. The auxiliary power supply part of the BMS, in order to make the BMS system compatible with a wide range of models, in the latest national standard there is a requirement to unify the auxiliary power supply as 12V/10A power supply, and the subsequent BMS management, passenger cars and buses will be a unified standard for the BMS power supply system. Our company is still in the process of developing the requirements of the national standard for this power supply part.