Characteristics of high
In power systems, DC power supply as a relay, automatic device, the control circuit operation, lighting, emergency lighting and other audio signals and power, is on the more important power plant and substation equipment. DC power failure caused by accidents have occurred, so the reliability of the DC power supply, high stability requirements. Most of the traditional use of DC power
SCR Rectifier. In recent years, many intelligent DC power supply manufacturers have introduced high-frequency
Switching Power Supply This power system has many advantages: safe, reliable, high degree of automation, with smaller size and weight, high comprehensive efficiency and low noise to meet the power needs of development and should be introduced.
At present, the DC power system is also used by traditional power gradually phased-frequency switching power supply to the modular transformation. High-frequency switching power supply rectifier works: AC power access rectifier module, by filtering and three-phase full-wave rectifier into DC after, then access to high-frequency inverter circuit, the DC is converted to high frequency AC, and finally by the high frequency
Transformer , Rectifier bridge, Filter After a smooth DC output. This high-frequency switching power supply mainly from the high-frequency switch charging module, focus monitor and store
Battery Group, etc., of which charging module and centralized monitor with built-in microprocessors, high intelligence. High-frequency switching power supply system during normal operation,
Charger The output parallel operation with batteries, power supply to the regular load, while charging the battery to float, to supplement the battery self-discharge. When the AC power input failure, power from the battery to the load, to ensure uninterrupted power supply to the load when AC power is restored, the system automatically recharge the battery to have on battery power after a large number of rapid discharge supplement .
Intelligent High Frequency Switching Power Supply with traditional power compared with control, the Department of the main technical indicators are better than standard grades 1 and 2 above, with the following features.
(1) phase-controlled power silicon rectifier in 1 +1 mode master from a backup, and high-frequency switching power supply module with N +1 redundant parallel combinations of power, that is, if N-modules of the output current to meet the charge current necessary, with the average distribution of N +1 module, therefore, can improve the system reliability. Failure of individual modules can be charged to replace, does not affect the normal operation of the system, expansion and maintenance.
(2) silicon-controlled rectifier to run on the floating charge mode, the DC output ripple are larger, have occurred in the central signal and high frequency relay protection device malfunction signal errors such as accidents, according to ministerial requests profile wave coefficient of less than 2%. In addition, parallel operation of thyristor rectifier and battery, ripple coefficient is bigger, if the float voltage fluctuations or low pulse charging the battery will discharge phenomenon occurs, the battery negative. High-frequency switching power supply using multiple intelligent charging device parallel combination of power supply modules, making power supply quality and technical parameters improved significantly. Module technology using quasi-resonant (or pulse width modulation), and current and voltage loop control technology to increase the switching frequency, opening loss, the output voltage ripple factor is very small, generally ± 0.1% rated voltage, and thus prevent the battery pulse charge and discharge, extended battery life, higher reliability.
(3) high-frequency switching power supply rectifier module has built-in microprocessor, is the foundation to improve equipment management level, to meet the DC system fault signal should be the premise of perfect, so that wiring is simple, quick installation. In addition to the panel directly on the display module output current and voltage, and a variety of operating conditions outside, but also through the control module and power system automation network or monitoring system substation DC ban
Communicate , For remote monitoring and the operation of the module and achieve four remote functions. The traditional DC power supply cabinet is usually in the installation screen current, voltage meters and other special devices to monitor the equipment, and these measurements can not be achieved through communication port remote monitoring (except for computer-based). Even if remote, is also the DC sampling method, sampling points are few, reflecting the various operating conditions signal contacts also means access to the optical plates or remote communication screen, therefore, cumbersome wiring, the low degree of automation to achieve remote control and remote transfer function difficult.
(4) according to the ministerial requirements of the precision error of charging the steady flow ± 5%, float charging voltage regulator precision of ± 2%. The high frequency switching power supply regulation, steady flow more precise, the error is ± 0.5%, to avoid battery over charge, less filling, to ensure the battery is running in the best condition. Valve-regulated battery capacity, less maintenance, low discharge rate, for large-capacity DC power supply. View from the principles of performance, high-frequency switch module for use with the valve-regulated battery package.
(5) high-frequency switching power supply rectifier with parallel operation mode automatic current sharing. At the same time, with over-current, overvoltage and transient short-circuit protection, safe and reliable lightning protection measures, can effectively withstand the impact of output short circuit. Also, take multiple effective measures to prevent high-frequency power supply and AC power grid side harmonic interference.
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