An Essay on UPS (part 1)

An Essay on UPS (part 1)

System Introduction

UPS mainly classified according to the working methods, which is divided into back-up-style, on-line interactive, on-line three categories. On-line UPS output, multi-sinusoidal, and the voltage and frequency stability, it is used in power quality more demanding place. UPS described in this article are on-line power supply system, mainly by the input filter, chargers, DC / DC converters, micro-controller, inverter circuit, input power factor conditioning circuit, RS232 communication interface, alarm circuits, etc. parts.

UPS system controller TI introduced the industry's first floating-point TMS320F28335 DSP, it has a 150MHz high-speed processing capability, with 32-bit floating point processing unit, a single instruction cycle 32-bit accumulate operations can be used to meet the faster code development and Integrated high-level controller, floating-point processor performance requirements. And compared to the previous generation's leading DSP, the latest F2833x floating-point controller can not only increase performance by an average of 50%, also has a higher accuracy, simplifying software development, compatible with fixed-point controller C28xTM software features.

When the mains is normal, on-line UPS input AC voltage 220V, through EMI / RFI filtered before being sent to the relay RY2. When the mains power supply voltage is normal, RY1 relay are closed. Under these conditions, municipal electric power will be divided in the following way to control the operation of the circuit after the class:

(I) electricity directly through the exchange of bypass was sent to NC relay contact RY2, and then power to the load. This situation has been maintained to the UPS implementation of the boot "self diagnosis" testing is done, the regulation of the UPS through the microprocessor power supply from the city state to switch to inverter power until the state.

(II) of the UPS via the built-in charger to recharge batteries.

(III) after the electricity supply through the fuse, and then through the regulatory function with input power factor rectifier filter, into a two-way DC power supply. The DC high voltage power supply in the power inverter Neijing SPWM power amplification and high frequency filtered into the way a stable amplitude, frequency and phase synchronization tracking mains power frequency and phase of high-quality pure sine power, the final adoption of sent to the load output filter.

(IV) when the mains power supply abnormal, the battery voltage through the DC / DC converter into a magnitude of up to ± 390V DC high voltage power supply, and then through the power inverter, transforms into the AC sine wave supply the load.

To learn more about power inverter, please visite http://www.szpowerinverter.com/ and http://www.bestekltd.com/, or mail to sale38@0102.cn .