CN205666679U - UPS of bypass automatic switch -over type - Google Patents

Abstract

The utility model discloses a bypass automatic switching UPS, comprising: a main power supply, a bypass power supply, a switching device, a first relay and a second relay; The working state of the first relay and the second relay is controlled so that when the power quality of the main power supply does not meet the system requirements, the first relay is disconnected, the second relay is connected, and the UPS is powered by the bypass power supply; When the power quality meets the system requirements again, the second relay is disconnected, the first relay is connected, and the UPS is powered by the main power supply. The UPS provided by the utility model does not need complex control circuits, and can automatically detect the abnormality of the main power supply and complete bypass switching only through a simple switching device, thereby enhancing the reliability of the system.

Description

A bypass automatic switching UPS

technical field

The utility model belongs to the field of power supplies, and more particularly relates to a bypass automatic switching UPS.

Background technique

Uninterruptible power supply (UPS), as the equipment to ensure the reliability of power supply for important loads, mainly includes five parts: rectifier circuit, inverter circuit, charging circuit, battery and bypass power supply. When the power grid is running normally, the UPS rectifies and inverts the input power of the mains to provide high-quality power for the load, and at the same time charges the battery through the charging circuit; when the power grid fails, the UPS converts the power stored in the battery through the inverter. The circuit provides uninterrupted power supply to the load. And when the inverter fails or the quality of its output power does not meet the requirements, the UPS should be able to automatically switch to the bypass power supply, and the mains will directly supply power to the load to improve the reliability of the UPS power supply.

In the existing UPS bypass switching device, the inverter output voltage is generally detected by the UPS main circuit control system, and a switching command is given. For example, the patent document CN 201234162Y discloses an intelligent bypass power fast switching device, the main power output by the inverter, the main power detection circuit, the bypass power, the bypass power detection circuit, the main switching circuit, the isolation drive circuit, the DSP It is composed of intelligent control circuit, load current detection circuit and RS485 communication interface. Since this method requires complex control circuits, it is prone to failure and has low reliability.

Utility model content

Aiming at the defects of the prior art, the purpose of the utility model is to simplify the UPS in the prior art, thereby reducing the cost and improving the reliability of the device.

In order to achieve the above purpose, the utility model provides a bypass automatic switching UPS, including: main power supply, bypass power supply, switching device, first relay and second relay;

The first output end of the main power supply is connected to the control end of the first relay, the second output end of the main power supply is connected to the input end of the switching device, and the first output end of the bypass power supply is connected to the second The control terminal of the relay;

The first control terminal of the switching device is connected to the first input terminal of the first relay, the second control terminal of the switching device is connected to the first input terminal of the second relay; the output terminal of the first relay As the first output terminal of the UPS, the output terminal of the second relay is used as the second output terminal of the UPS; the first relay and the second relay are dynamic closing relays or dynamic breaking relays;

The switching device is used to control the working states of the first relay and the second relay according to the power quality of the main power supply, so that when the power quality of the main power supply does not meet the system requirements, the first relay is disconnected, and the second relay is switched off. When the two relays are connected, the UPS is powered by the bypass power supply; when the power quality of the main power supply meets the system requirements again, the second relay is disconnected, the first relay is connected, and the UPS is powered by the main power supply.

Preferably, the switching device includes an electronic measuring device and a monitoring relay, the input terminal of the electronic measuring device is used as the input terminal of the switching device, and the output terminal of the electronic measuring device is connected to the first input terminal of the monitoring relay , the first control terminal of the monitoring relay is used as the first control terminal of the switching device, and the second control terminal of the monitoring relay is used as the second control terminal of the switching device; The power quality sends a control signal to control the working state and delay of the monitoring relay, thereby indirectly controlling the working state of the first relay and the second relay.

As a further preference, the first relay is a dynamic-off relay, the second relay is a dynamic-close relay, and the switching device is a dynamic-break relay.

As a further preference, the first relay is a snap-on relay, the second relay is a snap-off relay, and the monitoring relay is a snap-on relay.

As a further preference, the first relay and the second relay are moving-on relays, the monitoring relay is a switching relay, the moving contact is used as the first control terminal of the monitoring relay, and the static contact is used as the first control terminal of the monitoring relay. Monitor the second control terminal of the relay.

As a further preference, the first relay and the second relay are dynamic-break relays, the monitoring relay is a switching relay, the static contact is used as the first control terminal of the monitoring relay, and the movable contact is the first control terminal of the monitoring relay. Monitor the second control terminal of the relay.

As further preferably, the monitoring relay includes a delay control device, a first switch and a second switch, the input terminal of the delay control device is used as the input terminal of the delay control device, and the delay control The first output end of the device is connected to the first input end of the first transfer switch, and the second output end of the delay control device is connected to the first input end of the second transfer switch;

The second input end of the first transfer switch is connected to the first phase of the bypass power supply, the control end of the first transfer switch serves as the first control end of the monitoring relay, and the coil of the first relay The first end serves as the first input end of the first relay, and the second end of the coil of the first relay is connected to the second phase of the bypass power supply;

The second input end of the second transfer switch is connected to the first phase of the main power supply, the control end of the second transfer switch is used as the second control end of the monitoring relay, and the first phase of the coil of the second relay is One end serves as the first input end of the second relay, and the second end of the coil of the second relay is connected to the second phase of the main power supply;

The first relay and the second relay are active-break relays;

The delay control device is used to send a delay control signal to the first transfer switch and the second transfer switch according to the control signal, so that one of the first transfer switch and the second transfer switch is connected and the other is disconnected;

When the power quality of the main power supply meets the requirements, the first transfer switch is connected and the second transfer switch is disconnected. At this time, the coil of the first relay is in the energized state, and the coil of the second relay is in the de-energized state; and because the first relay and the second The two relays are dynamic-break relays at the same time, then the control terminal of the first relay is connected, and the control terminal of the second relay is disconnected; the output terminal of the UPS is switched to the output terminal of the first relay, that is, powered by the main power supply;

When the power quality of the main power supply does not meet the requirements, the second transfer switch is connected and the first transfer switch is disconnected. At this time, the coil of the second relay is in the energized state, and the coil of the first relay is in the power-off state; and because the first relay and The second relay is an active-off relay at the same time, the control terminal of the second relay is connected, and the control terminal of the first relay is disconnected; the output terminal of the UPS is switched to the output terminal of the second relay, that is, powered by the bypass power supply;

The electronic measuring device can continuously monitor the power quality of the main power supply, not only can send a control signal, but also can set the delay of the control signal according to the demand.

As further preferably, the monitoring relay includes a delay control device, a first switch and a second switch, the input terminal of the delay control device is used as the input terminal of the delay control device, and the delay control The first output end of the device is connected to the first input end of the first transfer switch, and the second output end of the delay control device is connected to the first input end of the second transfer switch;

The second input end of the first transfer switch is connected to the first phase of the main power supply, the control end of the first transfer switch is used as the first control end of the monitoring relay, and the second input end of the coil of the first relay is One end serves as the first input end of the first relay, and the second end of the coil of the first relay is connected to the second phase of the main power supply;

The second input end of the second transfer switch is connected to the first phase of the bypass power supply, the control end of the second transfer switch is used as the second control end of the monitoring relay, and the coil of the second relay is The first end serves as the first input end of the second relay, and the second end of the coil of the second relay is connected to the second phase of the bypass power supply;

The first relay and the second relay are snap-on relays;

The delay control device is used to send a delay control signal to the first transfer switch and the second transfer switch according to the control signal, so that one of the first transfer switch and the second transfer switch is connected and the other is disconnected;

When the power quality of the main power supply meets the requirements, the first transfer switch is connected and the second transfer switch is disconnected. At this time, the coil of the first relay is in the energized state, and the coil of the second relay is in the de-energized state; and because the first relay and the second The two relays are moving and closing relays at the same time, then the control terminal of the first relay is connected, and the control terminal of the second relay is disconnected; the output terminal of the UPS is switched to be powered by the output terminal of the first relay, that is, the main power supply;

When the power quality of the main power supply does not meet the requirements, the second transfer switch is connected and the first transfer switch is disconnected. At this time, the coil of the second relay is in the energized state, and the coil of the first relay is in the power-off state; and because the first relay and The second relay is a moving and closing relay at the same time, then the control terminal of the second relay is connected, and the control terminal of the first relay is disconnected; the output terminal of the UPS is switched to the output terminal of the second relay, that is, powered by the bypass power supply;

The electronic measuring device can continuously monitor the power quality of the main power supply, not only can send a control signal, but also can set the delay of the control signal according to the demand.

Preferably, a first display device is connected in parallel to the coil of the first relay, and a second display device is connected in parallel to the coil of the second relay.

Preferably, the power quality includes one or more of voltage amplitude, three-phase unbalance, voltage phase sequence or phase loss.

Through the above technical solutions conceived by the utility model, compared with the prior art, the following beneficial effects can be obtained:

1. The utility model switches the power supply state of the UPS through the first relay and the second relay, and directly supplies power to the switching device through the main power supply or the bypass power supply, avoiding the influence of the power supply of the switching device on the UPS, and not only enhancing the system high reliability and reduced production costs;

2. While controlling the monitoring relay, the electronic measuring device can also continuously monitor the working status of the main power supply, making the device work more reliable;

3. Supply power to the coil of the first relay through the main power supply, and supply power to the coil of the second relay through the bypass power supply, which realizes the uninterrupted operation of the switching device and further enhances the reliability of the system;

4. The electronic measuring device can also control the working delay of the switching device to realize the adjustment of the bypass switching time to meet the needs of different applications;

5. Using the first display device and the second display device to monitor the working state of the switching device makes the power supply state of the UPS more intuitive and more convenient to use.

Description of drawings

Fig. 1 is the schematic circuit diagram of the utility model embodiment 1;

Fig. 2 is a diagram of relay action signals during the switching process of the inverter outputting the main power supply and the bypass power supply in Embodiment 1 of the utility model.

detailed description

In order to make the purpose, technical solution and advantages of the utility model clearer, the utility model will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model, and are not intended to limit the utility model.

The utility model provides a bypass automatic switching UPS, comprising: a main power supply, a bypass power supply, a first relay, a second relay, an electronic measuring device, a monitoring relay, a first display device, a second display device and other components ;

Wherein, both the main power supply and the bypass power supply are three-phase power supplies, the first output end of the main power supply is connected to the control terminal of the first relay, and the second output end of the main power supply is connected to the input of the electronic measuring instrument terminal, the first output terminal of the bypass power supply is connected to the control terminal of the second relay;

The output terminal of the electronic measuring instrument is connected to the first input terminal of the monitoring relay, the first control terminal of the monitoring relay is connected to the first input terminal of the first relay, and the second control terminal of the monitoring relay is connected to a first input terminal of the second relay;

The output terminal of the first relay is used as the first output terminal of the UPS, and the output terminal of the second relay is used as the second output terminal of the UPS; the first relay and the second relay are moving relays Or a break type relay; the coils of the first relay and the second relay are connected in parallel with indicator lights and other display devices, which can monitor the working status of the relay.

Wherein, the main power supply is used as the main power supply source of the UPS, the bypass power supply is used as the auxiliary power supply source of the UPS, and the electronic measuring device is used to monitor the power quality of the main power supply, including voltage amplitude, three-phase unbalance , voltage phase sequence or lack of phase and other parameters; at the same time, the electronic measuring device sends a control signal to the monitoring relay according to the power quality of the main power supply, and controls the connection and disconnection of the first relay and the second relay through the monitoring relay; so that the When the power quality of the main power supply does not meet the system requirements, the first relay is disconnected and the second relay is connected, and the UPS is powered by the bypass power supply; when the power quality of the main power supply meets the system requirements again, the second relay is disconnected and the second relay is connected. A relay is connected, and the UPS is powered by the main power supply.

Among them, the type of the second relay and the first relay must be a switch-on relay or a switch-off relay, and the type of the monitoring relay is related to the type of the second relay and the first relay; for example, when the second relay and the first When the types of relays are the same, the monitoring relay is a conversion relay, and its static contact and moving contact are respectively used as the first control terminal and the second control terminal of the monitoring relay; and when the types of the second relay and the first relay are different , the monitoring relay is a moving-on type relay or a moving-off type relay;

When the first relay and the second relay are dynamic-break relays, the static contact of the monitoring relay is used as the first control terminal of the monitoring relay, and the movable contact is used as the second control terminal of the monitoring relay. The coil of the relay is powered by the bypass supply and the coil of the second relay is powered by the mains, specifically:

The monitoring relay includes a delay control device, a first transfer switch and a second transfer switch, the input end of the delay control device is used as the input end of the delay control device, and the first output of the delay control device is The end is connected to the first input end of the first transfer switch, and the second output end of the delay control device is connected to the first input end of the second transfer switch;

The second input end of the first transfer switch is connected to the first phase of the bypass power supply, the control end of the first transfer switch serves as the first control end of the monitoring relay, and the coil of the first relay The first end serves as the first input end of the first relay, and the second end of the coil of the first relay is connected to the second phase of the bypass power supply;

The second input end of the second transfer switch is connected to the first phase of the main power supply, the control end of the second transfer switch is used as the second control end of the monitoring relay, and the first phase of the coil of the second relay is One end serves as the first input end of the second relay, and the second end of the coil of the second relay is connected to the second phase of the main power supply;

When the power quality of the main power supply meets the requirements, the first transfer switch is connected and the second transfer switch is disconnected. At this time, the coil of the first relay is in the energized state, and the coil of the second relay is in the de-energized state; and because the first relay and the second The two relays are dynamic-break relays at the same time, then the control terminal of the first relay is connected, and the control terminal of the second relay is disconnected; the output terminal of the UPS is switched to the output terminal of the first relay, that is, powered by the main power supply;

When the power quality of the main power supply does not meet the requirements, the second transfer switch is connected and the first transfer switch is disconnected. At this time, the coil of the second relay is in the energized state, and the coil of the first relay is in the power-off state; and because the first relay and The second relay is an active-off relay at the same time, the control terminal of the second relay is connected, and the control terminal of the first relay is disconnected; the output terminal of the UPS is switched to the output terminal of the second relay, that is, powered by the bypass power supply;

The electronic measuring device can continuously monitor the power quality of the main power supply, not only can send a control signal, but also can set the delay of the control signal according to the demand.

And when the first relay and the second relay are moving and closing relays, the static contact of the monitoring relay is used as the first control terminal of the monitoring relay, and the moving contact is used as the second control terminal of the monitoring relay. The coil of the first relay is powered by the main power supply, and the coil of the second relay is powered by the bypass power supply. In this way, when the output of the UPS is switched between the main power supply and the bypass power supply, uninterrupted control is realized, making the device more reliable. ,in particular:

The monitoring relay includes a delay control device, a first transfer switch and a second transfer switch, the input end of the delay control device is used as the input end of the delay control device, and the first output of the delay control device is The end is connected to the first input end of the first transfer switch, and the second output end of the delay control device is connected to the first input end of the second transfer switch;

The second input end of the first transfer switch is connected to the first phase of the main power supply, the control end of the first transfer switch is used as the first control end of the monitoring relay, and the second input end of the coil of the first relay is One end serves as the first input end of the first relay, and the second end of the coil of the first relay is connected to the second phase of the main power supply;

The second input end of the second transfer switch is connected to the first phase of the bypass power supply, the control end of the second transfer switch is used as the second control end of the monitoring relay, and the coil of the second relay is The first end serves as the first input end of the second relay, and the second end of the coil of the second relay is connected to the second phase of the bypass power supply;

The first relay and the second relay are snap-on relays;

The delay control device is used to send a delay control signal to the first transfer switch and the second transfer switch according to the control signal, so that one of the first transfer switch and the second transfer switch is connected and the other is disconnected;

When the power quality of the main power supply meets the requirements, the first transfer switch is connected and the second transfer switch is disconnected. At this time, the coil of the first relay is in the energized state, and the coil of the second relay is in the de-energized state; and because the first relay and the second The two relays are moving and closing relays at the same time, then the control terminal of the first relay is connected, and the control terminal of the second relay is disconnected; the output terminal of the UPS is switched to be powered by the output terminal of the first relay, that is, the main power supply;

When the power quality of the main power supply does not meet the requirements, the second transfer switch is connected and the first transfer switch is disconnected. At this time, the coil of the second relay is in the energized state, and the coil of the first relay is in the power-off state; and because the first relay and The second relay is a moving and closing relay at the same time, then the control terminal of the second relay is connected, and the control terminal of the first relay is disconnected; the output terminal of the UPS is switched to the output terminal of the second relay, that is, powered by the bypass power supply;

The electronic measuring device can continuously monitor the power quality of the main power supply, not only can send a control signal, but also can set the delay of the control signal according to the demand.

Example 1

As shown in Figure 1, the UPS bypass automatic switching device of the present embodiment consists of a main power supply U1, a bypass power supply U2, a switching device CM, a first relay JC1, a second relay JC2, a first indicator light LED1, a second indicator light LED2 composition.

The first output terminal of the main power supply U1 is connected to the control terminal of the first relay JC1, the second output terminal of the main power supply JC1 is connected to the input terminal of the switching device, and the first output terminal of the bypass power supply U2 is connected to The control terminal of the second relay JC2;

Wherein, the switching device CM includes an electronic measuring device and a monitoring relay, the input terminal of the electronic measuring device is used as the input terminal of the switching device CM, and the output terminal of the electronic measuring device is connected to the first input terminal of the monitoring relay, The input terminal of the electronic measuring instrument is connected to the first output terminal of the main power supply U1, and the monitoring relay is a switching relay. In this embodiment, the ABB company model is specifically selected as the relay of CM-MPS 1SVR630884R3300, and the relay includes 2 a single-pole changeover relay, which are respectively referred to as the second changeover switch CM/NC and the first changeover switch CM/NO;

The second input end of the first transfer switch CM/NO is connected to the first phase of the main power supply U1, and the output end of the first transfer switch CM/NO is connected to the first end of the coil of the first relay. The second phase of the main power supply U1 is connected to the second end of the coil of the first relay; on the contrary, the second input end of the second transfer switch CM/NC is connected to the first phase of the bypass power supply U2, and the second The output end of the transfer switch CM/NC is connected to the first end of the coil of the second relay, and the second phase of the bypass power supply U2 is connected to the second end of the coil of the second relay;

The coil of the first relay JC1 is connected in parallel with the first indicator LED1, and the coil of the second relay JC2 is connected in parallel with the second indicator LED2.

In this example, the output voltage fluctuation range is required to be -5% to +5%, and the load type is a motor, so the overvoltage value is +5% of the rated voltage, and the undervoltage value is -5% of the rated voltage. The relay malfunctions when the main power supply U1 suddenly drops in voltage, and the reset delay tr of the monitoring relay is set to 0.1s. The working principle of this embodiment is as follows:

1. When the electronic measuring device detects that the three-phase voltage of the main power supply has voltage amplitudes exceeding the threshold range of overvoltage and undervoltage, three-phase voltage unbalance exceeds the phase unbalance threshold, three-phase voltage phase sequence error, and three-phase voltage phase loss or above phenomena When one or more of them are used, a control signal is sent to the monitoring relay, and the monitoring relay is reset after a reset delay tr, so that the first transfer switch CM/NO is disconnected, and the second transfer switch CM/NC is connected;

2. At this time, the coil of the second relay JC2 is connected, the second indicator LED2 is on, the coil of the first relay JC1 is disconnected, and the first indicator LED1 is off; since both the first relay JC1 and the second relay JC2 are active The control terminal of the first relay JC1 is used to control the main power supply U1, and the control terminal of the second relay JC2 is used to control the bypass power supply U2, then the UPS is switched to be powered by the bypass power supply U2 at this time;

3. Similarly, when the electronic measuring device monitors that the power supply of the main power supply U1 returns to normal, the monitoring relay will act after the response delay ts, first make the second transfer switch CM/NC disconnect, and the first transfer switch CM/NO connect, At this time, the coil of the first relay JC1 is turned on, and the first indicator LED1 is on; the coil of the second relay JC2 is disconnected, and the second indicator LED2 is off; after the switching delay td, the control terminal JC1 of the first relay JC1 /NO is connected, the control terminal JC2/NO of the second relay JC2 is disconnected, and the UPS is completely powered by the main power supply, as shown in FIG. 2 .

In this embodiment, tr=0.5s, ts=0s, td=0s. In the case where low voltage ride through is required, the reset delay tr can be set and the corresponding delay is set to 0.1s to avoid the voltage drop within the set time.

Those skilled in the art can easily understand that the above descriptions are only preferred embodiments of the present utility model, and are not intended to limit the present utility model. Any modifications, equivalent replacements and modifications made within the spirit and principles of the utility model Improvements and the like should all be included within the protection scope of the present utility model.

Claims (9)

1. the UPS bypassing automatic switchover type, it is characterised in that including: main power source, bypass supply, switching device, first continue Electrical equipment and the second relay；

First outfan of described main power source connects the control end of described first relay, and the second outfan of main power source connects institute Stating the input of switching device, the first outfan of described bypass supply connects the control end of described second relay；

First control end of described switching device connects the first input end of described first relay, the second of described switching device Control end and connect the first input end of described second relay；The outfan of described first relay is as the first of described UPS Outfan, the outfan of described second relay is as second outfan of described UPS；Described first relay and second continues Electrical equipment is dynamic circuit connector type relay or moving fault relay.

2. UPS as claimed in claim 1, it is characterised in that described switching device includes electronic measuring device and monitors relay Device, the input of described electronic measuring device connects as the input of described switching device, the outfan of described electronic measuring device The first input end of described supervisory relay, the first control end of described supervisory relay is as the first control of described switching device End processed, the second control end of described supervisory relay is as the second control end of described switching device.

3. UPS as claimed in claim 2, it is characterised in that described first relay is dynamic circuit connector type relay, and described second continues Electrical equipment is moving fault relay, and described supervisory relay is dynamic circuit connector type relay.

4. UPS as claimed in claim 2, it is characterised in that described first relay is moving fault relay, and described second continues Electrical equipment is dynamic circuit connector type relay, and described supervisory relay is moving fault relay.

5. UPS as claimed in claim 2, it is characterised in that described first relay and the second relay are that dynamic circuit connector type continues Electrical equipment, described supervisory relay is conversion type relay, and its movable contact is as the first control end of described supervisory relay, stationary contact Point is as the second control end of described supervisory relay.

6. UPS as claimed in claim 2, it is characterised in that described first relay and the second relay are that moving fault continues Electrical equipment, described supervisory relay is conversion type relay, and its stationary contact is as the first control end of described supervisory relay, dynamic tactile Point is as the second control end of described supervisory relay.

7. UPS as claimed in claim 2, it is characterised in that described supervisory relay includes overrun control, the first conversion Switch and the second permutator, the input of described overrun control is as the input of described overrun control, institute The first outfan stating overrun control connects the first input end of the first permutator, the second of described overrun control Outfan connects the first input end of the second permutator；

Second input of described first permutator connects the first phase of described bypass supply, the control of described first permutator End processed is as the first control end of described supervisory relay, and the first end of the coil of described first relay continues as described first The first input end of electrical equipment, the second end of the coil of described first relay connects the second phase of described bypass supply；

Second input of described second permutator connects the first phase of described main power source, the control of described second permutator Holding the second control end as described supervisory relay, the first end of the coil of described second relay is as described second relay The first input end of device, the second end of the coil of described second relay connects the second phase of described main power source；

Described first relay and the second relay are moving fault relay.

8. UPS as claimed in claim 2, it is characterised in that described supervisory relay includes overrun control, the first conversion Switch and the second permutator, the input of described overrun control is as the input of described overrun control, institute The first outfan stating overrun control connects the first input end of the first permutator, the second of described overrun control Outfan connects the first input end of the second permutator；

Second input of described first permutator connects the first phase of described main power source, the control of described first permutator Holding the first control end as described supervisory relay, the first end of the coil of described first relay is as described first relay The first input end of device, the second end of the coil of described first relay connects the second phase of described main power source；

Second input of described second permutator connects the first phase of described bypass supply, the control of described second permutator End processed is as the second control end of described supervisory relay, and the first end of the coil of described second relay continues as described second The first input end of electrical equipment, the second end of the coil of described second relay connects the second phase of described bypass supply；

Described first relay and the second relay are dynamic circuit connector type relay.

9. UPS as claimed in claim 1, it is characterised in that be parallel with the first display dress on the coil of described first relay Put, the coil of described second relay is parallel with the second display device.