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UPS power supply test in machine room - DC/DC conversion technology. In order to ensure the stability and reliability of the computer and the safety and accuracy of the data, more and more UPS power supplies are used in the computer room. The design of battery charging and discharging in UPS is very important for the selection of DC-DC conversion circuit. The bidirectional DC-DC converter realizes the bidirectional flow of energy, which is functionally equivalent to two unidirectional DC-DC converters, making the system have the advantages of high power density and low cost.

UPS power supply test in machine room - DC/DC conversion technology

The conversion of one DC voltage to another is called DC/DC conversion. One type is called DC chopper. This technology is widely used in the stepless speed change of trolleybus, subway trains and battery-powered motor vehicles to achieve stable acceleration, deceleration and rapid response performance. However, the rise of electric vehicles in the 1980s is an example. Using DC chopper instead of rheostat for speed regulation can improve the working link and save 20-30 electric energy. It can not only be used for voltage regulation, but also inhibit the use of harmonic current at the grid side.

AC/AC conversion technology

In the case of AC power supply that is different from the mains frequency or variable frequency, AC/AC converter is usually used, which can be realized in two ways:

1. AC/DClAC conversion: This method has to pass AC/DC and DC/AC power conversion twice, so its efficiency is low.

2. AC/AC conversion: This method can directly convert power frequency AC energy into AC energy with variable frequency without intermediate DC link, so it is called direct conversion. Because the voltage of UPS power supply is alternating, most of this conversion adopts the power grid commutation mode, and a few also adopt the forced commutation mode. With the development of self-closing devices, AC/AC conversion technology has been paid attention to.

The important application scope of AC/AC conversion technology is as follows:

① AC drive with high power (over thousands of kilowatts).

② Constant frequency power supply used by ships or aircraft.

③ Static reactive compensation.

Types of DC regulated power supply

The voltage after ACIDC transformation (rectification) and filtering often changes with the fluctuation of AC power supply voltage and the change of load. The change of DC voltage will sometimes cause the instability of the control device and the error in measurement and calculation. The characteristic is that the precise electronic instrument, automatic control, calculation device and trigger circuit of thyristor all require stable DC power supply.

DC regulated power supply has been developed for decades and has been integrated. Integrated circuits have the advantages of small size, low power consumption and long service life. Especially in the past decade, with the development of power integration technology, integrated voltage stabilizing circuits have come out in many varieties and models. Now they have formed series products according to output voltage and output current, and have become the mainstream products of DC voltage stabilizing circuits, especially suitable for small electronic equipment.

At present, there are many types of DC voltage stabilizer products processed, which can be classified from different perspectives:

1. According to the stability mode, there are parametric regulator and feedback regulator. The circuit of parametric voltage stabilizer is simple. It is important to use the nonlinearity of electronic devices to realize voltage stabilization. For example, one resistor and one voltage stabilizer can form a parametric voltage stabilizer. The feedback regulator has negative feedback and is a closed-loop adjustment system. It uses the change of output voltage to obtain the control voltage through sampling, comparison and amplification to control the adjusting elements, thus achieving the purpose of stabilizing the output voltage.

2. According to the adjustment device and load connection mode: there are parallel voltage regulator and series voltage regulator. The regulator connected in parallel with the load is called the well-connected regulator, and the regulator connected in series with the load is called the series regulator.

3. According to the purpose of the device, it is divided into electronic tube regulator, voltage regulator, transistor regulator, thyristor regulator, etc.

4. According to the working state of the adjusting device, there are linear regulator and switching regulator. The regulator working in the linear amplification state is called the linear regulator, and the regulator working in the switching state is called the switching regulator.

5. According to whether the important part of power supply is integrated circuit or discrete device, there are integrated linear voltage regulator, integrated switch voltage regulator and voltage regulator composed of discrete devices.

The demand of computer room for UPS power supply

1. High reliability is required for power supply

The customers IDC faces are generally company-level customers, some even portal websites. If the load is interrupted, IDC service providers will face huge losses, so the reliability of UPS power supply is very high.

2. Large load capacity

IDC machine room construction investment is huge, and will consider the business growth in the next few years, so it must be able to undertake enough business volume. Generally, there are about 50-100 racks in a computer room, and the load capacity of each rack is about thousands of watts. 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 aggregated power supply mode

In order to share the risk and take into account the convenience of management of centralized power supply, the load capacity of a computer room is generally considered, and the load capacity is about hundreds to thousands of kilowatts.

4. High requirements for harmonic pollution of equipment

As the country's requirements for energy conservation and environmental protection become higher and higher, telecom operators actively respond to it. At the same time, IDC room is also a large consumer of electricity, and is the focus of power supply units. It has become a trend to pay high attention to harmonics.

The above is the analysis of the computer room UPS power supply test-DC/DC conversion technology. The computer room UPS test is a critical work. The computer room and UPS system are the powerful guarantee for the normal work of the information solution system, so the effective real-time monitoring of the computer room and UPS system is particularly important.

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