Computer room UPS power supply detection-DC/DC conversion technology. In
order to ensure that computers work stably and reliably and data is safe and
accurate, more and more UPS power supplies are used in computer rooms. The
selection of DC-DC conversion circuit is extremely critical for the design of
battery charging and discharging in UPS. The bidirectional DC-DC converter
realizes the bidirectional flow of energy and is functionally equivalent to two
unidirectional DC-DC converters, giving the system the advantages of high power
density and low cost.
Computer room UPS power supply detection-DC/DC conversion technology
Converting one DC voltage into another DC voltage is called DC/DC
conversion. One type is called DC chopper. This technology is widely used in the
continuously variable speed of trolleybuses, subway trains, and battery-powered
motor vehicles to obtain smooth acceleration, deceleration, and quick response
performance. However, in the 1980s, The rise of electric cars in the 1990s is
one example. Using a DC chopper instead of a rheostat for speed regulation can
improve the working process and save 20-30% of electric energy. It can not only
regulate voltage, but also suppress harmonic currents on the grid side.
AC/AC conversion technology
In situations where an AC power source with a frequency different from the
mains power or with a variable frequency is required, an AC/AC converter is
usually used, which can be achieved with two solutions:
1. AC/DC/AC conversion: This solution must undergo two power conversions,
AC/DC and DC/AC, so the efficiency is low.
2. AC/AC conversion: This solution can directly convert power frequency AC
power into AC power with variable frequency without the need for an intermediate
DC link, so it is called direct frequency conversion. Since the UPS power supply
voltage is alternating, most of this conversion uses grid commutation, and a few
also use forced commutation. With the development of self-shutoff devices, AC/AC
conversion technology has received attention.
The main application areas of AC/AC conversion technology are as
follows:
①High power (above several thousand kilowatts) AC drive.
②Constant frequency power supply used by ships or aircraft.
③Static reactive power compensation.
Types of DC regulated power supplies
The voltage after ACIDC conversion (rectification) and filtering often
changes with the fluctuation of the AC power supply voltage and the change of
the load. Changes in DC voltage sometimes cause instability in the operation of
control devices, resulting in errors in measurement and calculation. Precision
electronic instruments, automatic controls, calculation devices and thyristor
trigger circuits all require stable DC power supply.
The development of DC regulated power supply has a history of several
decades and has been integrated. Integrated circuits have the advantages of
small size, low power consumption, and long life. Especially in the past ten
years, with the development of power integration technology, integrated voltage
stabilizing circuits have come out in many varieties and models. Nowadays, a
series of products are formed according to output voltage and output current,
and have become the mainstream products of DC voltage stabilizing circuits. ,
especially suitable for use in small electronic devices.
There are many types of DC voltage regulator products currently produced,
which can be classified from different perspectives:
1. According to the stabilization method: there are parametric voltage
regulators and feedback adjustment voltage regulators. The parametric voltage
regulator circuit is simple and mainly utilizes the nonlinearity of electronic
devices to achieve voltage stabilization. For example, one resistor and one
voltage regulator tube can constitute a parametric voltage regulator. The
feedback adjustment voltage regulator has negative feedback and is a closed-loop
adjustment system. It uses changes in the output voltage to obtain the control
voltage through sampling, comparison, and amplification to control the
adjustment components, thereby achieving the purpose of stabilizing the output
voltage.
2. According to the adjustment device and load connection mode: there are
parallel voltage regulators and series voltage regulators. The regulating device
connected in parallel with the load is called a well-connected voltage
regulator, and the regulating device connected in series with the load is called
a series voltage regulator.
3. According to the functional components: there are electronic tube
voltage regulators, Zener tube voltage regulators, transistor voltage
regulators, thyristor voltage regulators, etc.
4. According to the working status of the adjusting device: there are
linear voltage regulators and switching voltage regulators. The device that
adjusts the device to work in a linear amplification state is called a linear
regulator, and the device that adjusts the device to work in a switching state
is called a switching regulator.
5. According to whether the main part of the power supply is an integrated
circuit or a discrete device: there are integrated linear regulators, integrated
switching regulators and regulators composed of discrete devices.
The demand for UPS power supply in the computer room
1. High reliability requirements for power supply
The customers that IDC faces are generally enterprise-level customers, and
some are even portal websites. If the load is interrupted, the IDC business
provider will face huge losses, so the reliability of UPS power supply is very
high.
2. Large load capacity
The investment in the construction of the IDC computer room is huge, and
business growth in the next few years will be taken into consideration, so it
must be able to handle a large enough business volume. Generally, there are
about 50-100 racks placed in a computer room, and the load capacity of each rack
is about several kilowatts. Therefore, the load capacity of a computer room is
about hundreds to thousands of kilowatts. An IDC center may build multiple
computer rooms.
3. Relatively centralized power supply method
In order to share risks and take into account the convenient management of
centralized power supply, it is generally considered based on the load capacity
of a computer room, which ranges from hundreds to thousands of kilowatts.
4. High requirements for harmonic pollution of equipment
As the country's requirements for energy conservation and environmental
protection are getting higher and higher, telecom operators have responded
actively. At the same time, IDC computer rooms are also large consumers of
electricity and are the focus of power supply units. It is a trend to pay high
attention to harmonics.
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