CN101807804B - Uninterrupted power supply system with shared battery - Google Patents

Abstract

The invention discloses a battery-shared uninterruptible power supply system, which includes a storage battery and at least two UPSs, and also includes switch units and capacitors that are configured one-to-one with the at least two UPSs, and each of the at least two UPSs A UPS and correspondingly configured switch units are coupled in series to the storage battery to form an independent loop, each capacitor is respectively connected across the positive and negative terminals of the corresponding UPS, and the turn-on time of each switch unit does not overlap. According to the present invention, each switch unit can be controlled so that there is no loop between each UPS, thereby ensuring stable operation of the system and achieving the effect that multiple UPSs share the same battery.

Description

battery shared uninterruptible power supply system

technical field

The present invention relates to an uninterruptible power supply (Uninterruptable Power Supply, UPS), in particular to a battery-shared uninterruptible power supply system.

Background technique

The current existing UPS system is shown in FIG. 1 , which describes the UPS system disclosed by Schneider's US Patent No. US5654591, and the system includes a UPS. During the operation of the system, when the voltage of P and N points in the UPS cannot meet the requirements, the UPS will ask for energy from the battery 2 and continue to supply power to the load. When working with a single UPS, there is no problem with this circuit, and it can provide continuous energy for the load. However, when two or more UPSs use the battery 2 together (that is, share the battery 2 and diode A1 in the figure), Each UPS will be at the same point at A, B, and C, and problems will arise. Since the switching tubes T1 and T2 of a single UPS have two working states of on and off, the switching tubes T1 of different UPSs and the switching tubes T2 of different UPSs will work at the same time, while multiple switches of different UPSs The tube T2 and multiple inductors L2 are connected in parallel through the power distribution system, and the multiple switching tubes T1 and multiple inductors L1 of different UPSs are also connected in parallel through the power distribution system. Therefore, when sharing the battery 2, there will be The current flows from the switching tube T1 and inductor L1 of one UPS to the switching tube T2 and inductor L2 of another UPS, or from the switching tube T2 and inductor L2 of one UPS to the switching tube T1 and inductor L1 of another UPS, which will cause The entire control system is unstable, causing the system to crash.

Contents of the invention

The main purpose of the present invention is to provide a battery-sharing uninterruptible power supply system to address the shortcomings of the prior art, so that multiple UPSs in the system can share the battery.

To achieve the above object, the present invention adopts the following technical solutions:

A battery-shared uninterruptible power supply system, including a storage battery and at least two UPSs, and also includes a switch unit and a capacitor that are configured one-to-one with the at least two UPSs, and each of the at least two UPSs is connected to a corresponding The correspondingly configured switching units are coupled in series to the storage battery to form an independent circuit, each capacitor is respectively connected across the positive and negative terminals of the corresponding UPS, and the turn-on time of each switching unit does not overlap. The switching unit includes a first MOS tube and the second MOS tube, the drain of the first MOS tube is connected to the positive pole of the storage battery, the source of the first MOS tube is connected to the positive terminal of the corresponding UPS, and the drain of the second MOS tube is It is connected to the negative terminal of the corresponding UPS, and the source of the second MOS tube is connected to the negative terminal of the storage battery.

Preferably, it also includes a plurality of charging paths configured one-to-one with the at least two UPSs, and the charging paths include a third MOS transistor connected in parallel with the first MOS transistor and a third MOS transistor connected in parallel with the second MOS transistor. The fourth MOS tube connected in reverse parallel connection.

Preferably, the turn-on times of the respective switch units are complementary.

Preferably, the turn-on frequency of the switch unit is 20-40Khz.

The beneficial technical effect of the present invention is:

The uninterruptible power supply system of the present invention includes a storage battery, at least two UPSs, and a switch unit and a capacitor configured one-to-one with the UPS. Each UPS is connected in series with the corresponding switch unit and coupled to the storage battery to form an independent loop. The corresponding capacitor spans Connected to the positive and negative terminals of the UPS, by controlling the turn-on time of each switch unit to not overlap, each UPS circuit can work independently without mutual influence, for example, control each switch unit to be turned on in a complementary manner to realize multiple groups of circuits Complementary work, in this way, there will be no loop between each UPS, so as to ensure the stable operation of the system, and achieve the effect that multiple UPSs share the same or multiple batteries. The present invention is applicable to all UPS systems.

Description of drawings

Fig. 1 is the circuit principle diagram of existing a kind of UPS system;

Fig. 2 is a schematic topology diagram of a battery-shared uninterruptible power supply system according to an embodiment of the present invention;

Fig. 3 is a sequence diagram of on-off control of each switching tube shown in Fig. 2;

FIG. 4 is a schematic topology diagram of a battery-shared uninterruptible power supply system according to another embodiment of the present invention;

The features and advantages of the present invention will be described in detail with reference to the accompanying drawings.

Detailed ways

The UPS referred to in the present invention refers to a UPS circuit that does not include a battery.

In an embodiment of the present invention, the battery-shared uninterruptible power supply system includes a storage battery, at least two UPSs, and switching units and capacitors that are configured one-to-one with the UPSs, and each UPS is coupled in series with the corresponding switching units. The storage battery forms an independent circuit, and the correspondingly configured capacitors are connected across the positive and negative terminals of the UPS, and the turn-on time of each switch unit does not overlap. According to this circuit setting, each UPS and the corresponding switch unit are connected in series to the same battery to form an independent circuit. One of the UPS can be selected to work alone, or multiple UPS can be connected in parallel to work by properly controlling each switch unit. As long as the turn-on time of each switch unit does not overlap, that is, only one switch unit is turned on at any time, it will not cause the battery voltage to be applied to multiple capacitors at the same time, and a loop is formed between different UPSs, so that each UPS can be independent and normal. ground work, to achieve the effect of battery sharing.

As shown in Figure 2, according to one embodiment, the battery-shared uninterruptible power supply system includes a storage battery Bat, three UPS namely UPS1, UPS2 and UPS3, three switch units and three capacitors C1, C2, C3, each UPS, The switch unit and the capacitor are configured in one-to-one groups. The first switch unit includes MOS transistor Q1 and MOS transistor Q2, wherein the drain of MOS transistor Q1 is connected to the positive pole of battery Bat, and the source of MOS transistor Q1 is connected to the positive terminal of UPS1. , the drain of MOS transistor Q2 is connected to the negative terminal of UPS1, the source of MOS transistor Q2 is connected to the negative electrode of battery Bat, the gates of MOS transistor Q1 and MOS transistor Q2 are respectively connected to the driving circuit (not shown), UPS1, MOS transistor Q1 , The MOS tube Q2 is connected in series with the battery to form an independent circuit, the positive pole of the capacitor C1 is connected to the positive terminal of the UPS1, and the negative pole of the capacitor C1 is connected to the negative terminal of the UPS1. UPS2 is connected to the MOS transistors Q3 and Q4 of the second switching unit and UPS3 is connected to the MOS transistors Q5 and Q6 of the third switching unit and connected to the storage battery in the same manner. It should be noted that the first MOS transistor and the second MOS transistor referred to in the present invention are respectively MOS transistor Q1 and MOS transistor Q2 as far as the first switch unit is concerned, and are respectively MOS transistor Q1 and MOS transistor Q2 as far as the second switch unit is concerned. The transistor Q3 and the MOS transistor Q4 are respectively the MOS transistor Q5 and the MOS transistor Q6 as far as the third switch unit is concerned.

Capacitors C1, C2, and C3 can be polarized capacitors, such as electrolytic capacitors, but can also be replaced by non-polarized capacitors. Since the capacitors C1, C2, and C3 can store a certain amount of energy, it can be ensured that the corresponding energy is provided to the corresponding UPS when switching among the three UPSs. According to this embodiment, as long as the turn-on times of the switch units do not overlap, UPS1, UPS2 and UPS3 can work independently and normally under the condition of sharing the battery Bat.

Preferably, the three switch units are controlled to be turned on in a complementary manner. The working logic is shown in Figure 3, and the working mode is as follows: MOS tubes Q1 and Q2 work at the same time, MOS tubes Q3 and Q4 work at the same time, MOS tubes Q5 and Q6 work at the same time, and the three groups of MOS tubes work complementary. When MOS transistors Q1 and Q2 are turned off, capacitor C1 provides energy for UPS1; when MOS transistors Q3 and Q4 are turned off, capacitor C2 provides energy for UPS2; when MOS transistors Q5 and Q6 are turned off, capacitor C3 provides energy for UPS3. More preferably, the MOS transistors Q1-Q6 all work in a high-frequency state, for example, the frequency is 20-40Khz. Since the MOS transistors Q1, Q2, MOS transistors Q3, Q4, and MOS transistors Q5, Q6 work complementary, the turn-on time of the three groups of MOS transistors does not overlap, and only one group of MOS transistors is turned on at any time, so each UPS can share The battery way works stably.

Fig. 4 schematically shows another embodiment of the battery sharing uninterruptible power supply system. On the basis of the previous embodiment, the uninterruptible power supply system further includes three charging paths configured one-to-one by three UPSs. As shown in Figure 4, the first charging path includes MOS transistor Q7 connected in reverse parallel with MOS transistor Q1 and MOS transistor Q8 connected in reverse parallel with MOS transistor Q2, and the second charging path includes MOS transistor Q3 reversely connected to MOS transistor Q3. The MOS transistor Q9 connected in parallel and the MOS transistor Q10 connected in reverse parallel with the MOS transistor Q4, the third charging path includes the MOS transistor Q11 connected in reverse parallel with the MOS transistor Q5 and the MOS transistor Q11 connected in reverse parallel with the MOS transistor Q6 Q12. In mains mode, UPS1 can provide current I1 to charge battery Bat through MOS transistors Q7 and Q8, UPS2 can provide current I2 to charge battery Bat through MOS transistors Q9 and Q10, and UPS3 can provide current I3 to charge battery Bat through MOS transistors Q11 and Q12 Bat charging. By setting the charging path, it is ensured that the battery can be well supplemented when the UPS works in the mains mode. It should be noted that the third MOS transistor and the fourth MOS transistor referred to in the present invention are respectively MOS transistor Q7 and MOS transistor Q8 in terms of the first charging path, and are respectively MOS transistor Q8 and MOS transistor Q8 in terms of the second charging path. The tube Q9 and the MOS tube Q10 are respectively the MOS tube Q11 and the MOS tube Q12 in terms of the third charging path.

The above content is a further detailed description of the present invention in conjunction with specific preferred embodiments, and it cannot be considered that the specific implementation of the present invention is limited to these descriptions. For example, UPS, switch unit and capacitor are not limited to three groups, and can also be two groups or For another example, the on-off control of each switch unit is not limited to complementarity, as long as the on-off modes do not have adverse effects on each other between the circuits. For those of ordinary skill in the technical field of the present invention, without departing from the concept of the present invention, some simple deduction or replacement can be made, which should be regarded as belonging to the protection scope of the present invention.

Claims (4)

1. the uninterruptible power system of a battery sharing; Comprise storage battery and at least two UPS, it is characterized in that, also comprise switch element and electric capacity with the corresponding one by one configuration of said at least two UPS; Each UPS among said at least two UPS in series is coupled to said storage battery with the switch element of corresponding configuration and forms independently loop; Each electric capacity is connected across respectively on the positive and negative end of corresponding UPS, and the service time non-overlapping of each switch element, said switch element comprise first metal-oxide-semiconductor and second metal-oxide-semiconductor; The drain electrode of said first metal-oxide-semiconductor connects the positive pole of said storage battery; The source electrode of said first metal-oxide-semiconductor connects the anode of corresponding UPS, and the drain electrode of said second metal-oxide-semiconductor connects the negative terminal of corresponding UPS, and the source electrode of said second metal-oxide-semiconductor connects the negative pole of said storage battery.

2. the uninterruptible power system of battery sharing as claimed in claim 1; It is characterized in that; Also comprise a plurality of charging paths that dispose one to one with said at least two UPS, said charging path comprises the 3rd metal-oxide-semiconductor and the 4th metal-oxide-semiconductor reverse with said second metal-oxide-semiconductor and that connect reverse with said first metal-oxide-semiconductor and that connect.

3. according to claim 1 or claim 2 the uninterruptible power system of battery sharing is characterized in that the service time of said each switch element is complementary.

4. according to claim 1 or claim 2 the uninterruptible power system of battery sharing is characterized in that the frequency of opening of said switch element is 20-40Khz.

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