CN201887534U - Uninterruptible multichannel AC-input power supply - Google Patents

Abstract

The utility model relates to the technical field of power supplies, an uninterruptible power supply with multi-channel AC input, comprising an AC input power supply, at least two rectifiers, an inverter and a static switch. The bypass AC input and output terminals are connected to a static switch, the main AC input includes at least two branch AC inputs, and each branch AC input is connected to a rectifier to form a rectifier circuit. The rectifier circuit is connected in parallel and its output end is connected to the input end of the inverter, the output end of the inverter is connected to a static switch, an isolation module is provided between the rectifiers, and an isolation module is provided on the output end of the inverter module. The utility model has a simple structure, requires low cost and high reliability, effectively protects electric equipment, and can be widely used in important units and places such as substations, large factories, conference centers, important communities, and government agencies.

Description

An Uninterruptible Power Supply with Multiple AC Inputs

technical field

The utility model relates to the technical field of power supplies, in particular to an uninterrupted power supply with multiple AC inputs.

Background technique

In important units and places such as substations, large factories, conference centers, important communities, and government agencies, two or more AC inputs are generally equipped to improve the reliability of continuous power supply and avoid single-channel power supply in the event of a power outage or failure. Large-scale, long-term power failure and other risks; To realize the automatic switching of multiple AC inputs, it is generally controlled by an automatic redundant switch and an isolation transformer. However, the switching time of the redundant switch is at least 10ms or more when switching, which cannot Satisfying the power requirements of some precision equipment may cause the risk of data loss or system restart, and the switching current of the redundant switch is large when switching, which has a large impact on the power grid and the redundant switch is easily damaged. The reliability of the equipment is poor, especially The faster the switching time, the easier it is to damage.

The DC side of the traditional uninterruptible power supply is powered by a battery, but the battery has problems such as short service life, difficult maintenance, complicated charging technology, sensitive ambient temperature, large pollution, and large footprint, and at the same time cannot achieve flexible 0ms uninterrupted switching , and the output and input cannot be completely isolated to eliminate interference, and the stable and pure sine wave cannot be output to meet the power requirements of all equipment.

Utility model content

Therefore, in view of the above problems, the utility model proposes an uninterruptible power supply that can isolate the interference between the output and the input when the power supply is switched, and output stable and relatively pure sine waves to supply multiple AC inputs of all electrical equipment.

In order to solve this technical problem, the utility model adopts the following scheme: an uninterruptible power supply with multi-channel AC input, comprising an AC input power supply, at least two rectifiers, an inverter and a static switch, the AC input power supply is composed of the main The main AC input includes at least two branch AC inputs, and each branch AC input is connected to a rectifier to form a rectifier. circuit, the rectifier circuits are connected in parallel and their output ends are connected to the input end of the inverter, the output end of the inverter is connected to a static switch, an isolation module is arranged between the rectifiers, and the output of the inverter There is an isolation module on the end.

Further, the bypass AC input is in phase with any branch AC input of the main AC input.

Further, the bypass AC input may be an AC power supply completely out of phase with the main AC input.

By adopting the aforementioned technical scheme, the beneficial effect of the utility model is: when the system is in normal operation, it can isolate the influence of input harmonics, voltage drops, surges, etc. on the output load, and can provide pure and stable sine wave output; When the AC power fails, it can automatically and flexibly switch to another power supply in 0ms, and the AC inputs are redundant with each other; the system transformation is simple, that is, the battery input of the original UPS is canceled and replaced by AC input and rectified, which requires low cost and is effective. Traditional UPS features mature technology and high reliability; the uninterruptible power supply device does not need to be equipped with batteries, which avoids the problems of short battery life, difficult maintenance, complicated charging technology, sensitive ambient temperature, large pollution, and large floor space. Highly respected value; the device integrates multi-channel rectifiers, inverters, static switches, etc., making it small and easy to install.

Description of drawings

Fig. 1 is the circuit principle block diagram of the utility model embodiment.

Detailed ways

The utility model is further described now in conjunction with accompanying drawing and specific embodiment.

With reference to Fig. 1, the uninterruptible power supply of preferred multi-channel AC input of the present utility model comprises AC input power supply 1, rectifier 2, rectifier 3, inverter 4 and static switch 5 and is made up of, and described AC input power supply 1 is made up of main The bypass AC input 11 and the bypass AC input 12 are formed, the bypass AC input 12 is out of phase with the main channel AC input 11, the output terminal of the bypass AC input 12 is connected to the static switch 5, and the main channel AC input 11 includes branch AC input 111 and branch AC input 112, branch AC input 111 is connected with rectifier 2 to form rectifier circuit 6, branch AC input 112 is connected with rectifier 3 to form rectifier circuit 7, rectifier circuit 6 and rectifier circuit 7 are connected in parallel connected and its output terminal is connected to the input terminal of inverter 4, the rectifier 2 is provided with an isolation module, which can completely isolate the rectifiers, and the output terminal of the inverter 4 is provided with an isolation module, which can make the inverter The output is isolated from the bypass AC input 12 , that is, each AC input can realize complete electrical isolation, and the output end of the inverter 4 is connected to a static switch 5 .

When the utility model is in normal operation, that is, when the AC input 111 of the system branch and the AC input 112 of the branch are both normal, the rectifier 2 and the rectifier 3 work at the same time and output the DC voltage to the common DC bus, and the DC bus voltage passes through the inverter 4 Then invert it into a pure and stable sine wave and output it to the static switch 5. The static switch 5 preferably selects the inverter output, and only switches to the bypass AC input 12 output in the startup stage, machine failure, maintenance, overload and other situations.

The main AC input in the utility model contains at least two branch AC inputs, and the rectifier is equipped according to the number of branch AC input lines; the bypass AC input is in phase with any branch AC input in the main road AC input .

Although the utility model has been specifically shown and described in conjunction with preferred embodiments, those skilled in the art should understand that, without departing from the spirit and scope of the utility model defined by the appended claims, changes in form and details may be made. Making various changes to the utility model is within the protection scope of the utility model.

Claims (3)

1. a multichannel exchanges the uninterrupted power supply of importing, it is characterized in that: comprise alternating current input power supplying, at least two rectifiers, inverter and static diverter switch are formed, described alternating current input power supplying exchanges input by main road interchange input and constitutes with bypass, described bypass exchanges input/output terminal and is connected with static diverter switch, described main road exchanges input and contains two-way branch road interchange input at least, each branch road exchanges input and connects and composes rectification circuit with rectifier respectively, described each rectification circuit is connected in parallel and its output is connected with the inverter input, described inverter output end connects static diverter switch, be provided with isolation module between described each rectifier, described inverter output end is provided with isolation module.

2. exchange the uninterrupted power supply of input according to the described multichannel of claim 1, it is characterized in that: arbitrary branch road exchanged the input homophase during described bypass interchange input exchanged with main road and imports.

3. exchange the uninterrupted power supply of input according to the described multichannel of claim 1, it is characterized in that: it can be to exchange the complete out of phase AC power of input with main road that described bypass exchanges input.

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