阅读说明：本技术 不间断电源 (Uninterruptible power supply ) 是由 王亚鹏 于 2020-12-31 设计创作，主要内容包括：不间断电源,涉及不间断电源技术领域。不间断电源,包括逆变输出线路、切换继电器、市电供电线路、负载供电点,负载供电点用于连接负载以向负载供电,逆变输出线路连接负载供电点以可向负载供电,市电供电线路一端连接市电,另一端连接负载供电点,以可从市电取电而向负载供电,还包括电流检测单元与输出电压检测单元。本发明的不间断电源,仅需设置所述电流检测单元与输出电压检测单元,即可结合逆变输出线路的输出情况、向切换继电器发出的控制信号、所述电流检测单元所检测的电流、输出电压检测单元所检测的电压准确地判断切换继电器是否出现粘连的情况,从而使不间断电源设备能够在切换继电器出现触点粘连时及时保护设备,避免被损坏。(Uninterrupted power source relates to uninterrupted power source technical field. The uninterruptible power supply comprises an inversion output circuit, a switching relay, a mains supply line and a load power supply point, wherein the load power supply point is used for being connected with a load to supply power to the load, the inversion output circuit is connected with the load power supply point to supply power to the load, one end of the mains supply line is connected with a mains supply, the other end of the mains supply line is connected with the load power supply point to supply power to the load from the mains supply, and the uninterruptible power supply further comprises a current detection unit and an output voltage detection unit. According to the uninterruptible power supply, only the current detection unit and the output voltage detection unit are needed to be arranged, the output condition of the inversion output circuit, the control signal sent to the switching relay, the current detected by the current detection unit and the voltage detected by the output voltage detection unit can be combined to accurately judge whether the switching relay is adhered or not, so that uninterruptible power supply equipment can be protected in time when the switching relay is adhered by contacts, and damage to the equipment is avoided.)

1. The uninterruptible power supply is characterized by further comprising a current detection unit and an output voltage detection unit, wherein the current detection unit is used for detecting the current of the mains supply line, and the output voltage detection unit is used for detecting the voltage between the load power supply line and a zero line,

when the inverter output line has no output and the switching inverter is controlled to disconnect the commercial power supply line, if the voltage detected by the output voltage detection unit is not zero, the contact of the switching relay is judged to be adhered;

when the inverter output line has no output and the switching inverter is controlled to conduct a commercial power supply line, if the voltage detected by the output voltage detection unit is zero or far lower than the commercial power voltage, the contact of the switching relay is judged to be adhered;

when the inverter output circuit outputs and controls the switching inverter to cut off a commercial power supply circuit, if the voltage detected by the output voltage detection unit is not zero and the current detected by the current detection unit is not zero, the contact adhesion of the switching relay is judged.

2. The uninterruptible power supply of claim 1, wherein the current detection unit comprises a current transformer, the current transformer being disposed beside the utility power line to sense the current of the utility power line.

3. The uninterruptible power supply of claim 1, wherein a normally open contact of the switching relay conducts a utility power supply line.

4. The uninterruptible power supply of claim 1, wherein the output of the inverter output line is turned off after the switching relay contact is determined to be stuck.

Technical Field

The invention relates to the technical field of uninterruptible power supplies.

Background

The UPS, i.e., an uninterruptible power supply, is a system device that connects a storage battery to a host and converts direct current power to commercial power through a module circuit such as a host inverter. When the mains supply input is normal, the UPS supplies the mains supply to a load for use after stabilizing the voltage of the mains supply, and simultaneously charges a built-in battery; when the commercial power is interrupted, the UPS immediately switches and converts the direct current electric energy of the battery into the commercial power through the inverter to supply power to the load continuously, so that the load keeps normal work, and the software and hardware of the load are protected from being damaged.

Switching between UPS and the commercial power is realized through the relay usually, and the relay is owing to electrified work, and the contact can the arc of drawing, can appear the contact adhesion when serious to make the relay can't realize controlled switching action. At present, a solution for relay contact adhesion generally adopts a high-current relay to reduce the probability of contact adhesion as much as possible, but only the probability can be reduced, the probability cannot be completely eradicated, and detection and protection after contact adhesion cannot be realized.

Disclosure of Invention

In view of this, the invention provides an uninterruptible power supply, which can reduce the risk of damage and has higher safety.

In order to solve the technical problems, the invention provides the following technical scheme.

1. The uninterruptible power supply comprises an inversion output circuit, a switching relay, a mains supply line and a load power supply point, wherein the load power supply point is used for connecting a load to supply power to the load, the inversion output circuit is connected with the load power supply point to supply power to the load, one end of the mains supply line is connected with the mains supply, the other end of the mains supply line is connected with the load power supply point to take power from the mains supply to supply power to the load, the uninterruptible power supply also comprises a current detection unit and an output voltage detection unit, the current detection unit is used for detecting the current of the mains supply line, the output voltage detection unit is used for detecting the voltage between,

when the inverter output line has no output and the switching inverter is controlled to disconnect the commercial power supply line, if the voltage detected by the output voltage detection unit is not zero, the contact of the switching relay is judged to be adhered;

when the inverter output line has no output and the switching inverter is controlled to conduct a commercial power supply line, if the voltage detected by the output voltage detection unit is zero or far lower than the commercial power voltage, the contact of the switching relay is judged to be adhered;

when the inverter output circuit outputs and controls the switching inverter to cut off a commercial power supply circuit, if the voltage detected by the output voltage detection unit is not zero and the current detected by the current detection unit is not zero, the contact adhesion of the switching relay is judged.

According to the uninterruptible power supply, only the current detection unit and the output voltage detection unit are needed to be arranged, the output condition of the inversion output circuit, the control signal sent to the switching relay, the current detected by the current detection unit and the voltage detected by the output voltage detection unit can be combined to accurately judge whether the switching relay is adhered or not, even whether the normally open contact or the normally closed contact of the switching relay is adhered or not can be accurately judged, the adhesion detection of the contact of the switching relay can be realized through a simple circuit structure and low cost, and therefore, equipment can be protected in time when the contact of the switching relay is adhered, and damage of the equipment can be avoided.

2. Technical scheme 1 the uninterrupted power source, the current detection unit includes current transformer, current transformer locates by commercial power supply circuit to the current of induction detection commercial power supply circuit.

3. According to the uninterruptible power supply in the technical scheme 1, the normally open contact of the switching relay is connected with a mains supply power supply circuit.

4. According to the uninterruptible power supply in the technical scheme 1, the output of the inversion output circuit is closed after the contact of the switching relay is judged to be adhered.

Drawings

Fig. 1 is a schematic structural diagram of an ups according to the present invention;

reference numerals:

an inverting output line 1; a commercial power supply circuit 2; a load supply point 3; the output voltage detection unit 4.

Detailed Description

The invention is described in detail below with reference to specific embodiments.

As shown in fig. 1, the uninterruptible power supply includes an inverter output line 1, a switching relay K1, a utility power supply line 2, a load power supply point 3, the load power supply point 3 is used for connecting a load to supply power to the load, the inverter output line 1 is connected with the load power supply point 3 to supply power to the load, the utility power is connected to one end of the utility power supply line 2, the load power supply point 3 is connected to the other end to get power from the utility power and supply power to the load, and the uninterruptible power supply further includes a current detection unit and an output voltage detection unit 4, the current detection unit includes a current transformer CT1, the current transformer CT1 is arranged beside the utility power supply line 2 to detect the current of the utility power supply line 2 by induction, and the output voltage detection unit 4 is used for detecting the voltage between the.

The normally open contact of the switching relay K1 switches on the mains supply line 2.

When the inverter output circuit 1 has no output and controls the switching inverter to cut off the commercial power supply circuit 2, if the voltage detected by the output voltage detection unit 4 is not zero, it is determined that the contacts a and c of the switching relay K1 are adhered;

when the inverter output circuit 1 has no output and controls the switching inverter to conduct the commercial power supply circuit 2, if the voltage detected by the output voltage detection unit 4 is zero or far lower than the commercial power voltage, it is determined that the contacts a and b of the switching relay K1 are adhered;

when the inversion output line 1 has output and controls the switching inverter to cut off the commercial power supply line 2, if the voltage detected by the output voltage detection unit 4 is not zero and the current detected by the current detection unit is not zero, it is determined that the contacts a and c of the switching relay K1 are adhered, and the output of the inversion output line 1 is closed.

According to the uninterruptible power supply, only the current detection unit and the output voltage detection unit 4 are needed to be arranged, whether the adhesion condition of the switching relay K1 occurs or not can be accurately judged according to the output condition of the inverter output circuit 1, the control signal sent to the switching relay K1, the current detected by the current detection unit and the voltage detected by the output voltage detection unit 4, even whether the adhesion condition occurs is the normally open contact or the normally closed contact of the switching relay K1 can be accurately judged, the detection of the adhesion of the contact of the switching relay K1 can be realized through a simple circuit structure and low cost, and therefore, equipment can be timely protected when the contact adhesion occurs in the switching relay K1, and damage of the equipment can be avoided.

Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the protection scope of the present invention, although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions can be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention.