Uninterruptible Power Supply System

Abstract

The present application discloses an uninterruptible power supply system, which includes a rectification module, an inversion module, a buffer module, a static switch module, a bypass module and a controller. Among them, the input end of the rectification module is electrically connected to the mains AC power supply, the output end of the rectification module is electrically connected to the input end of the inversion module, the output end of the inversion module is respectively electrically connected to the first end of the static switch module, the input end of the buffer module and the first end of the load, the input end of the buffer module is further electrically connected to the output end of the rectification module, the second end of the static switch module is electrically connected to the second end of the load, the inverter drive signal output pin and the switch drive signal output pin of the controller are respectively electrically connected to the control end of the inversion module and the control end of the static switch module, and the bypass module is respectively electrically connected to the standby AC power supply, the first end of the static switch module and the second end of the load. The buffer module suppresses the spike voltage generated by the inversion module, reduces the damage rate of the inversion module, and improves the output power quality.

Description

Technical Field

[0001] The present invention belongs to the technical field of power supplies, and particularly relates to an uninterruptible power supply system. Background Art

[0002] The uninterruptible power supply system (UPS) plays an irreplaceable role in modern industrial applications. Through the AC-DC-AC conversion mode, the uninterruptible power supply system can ensure continuous, stable, and accurate output power to the user load.

[0003] The UPS system is usually composed of components such as a rectifier, an inverter, a static transfer switch, and an output filtering device. Under normal mains input, the alternating current is converted into direct current by the rectifier and supplied to the inverter. The inverter converts it into alternating current and outputs it to the load. When the mains is abnormal, the system DC battery can provide direct current to supply the inverter, thus effectively ensuring the continuity of the system output. Even when the mains is interrupted, the uninterruptible power supply system equipment can operate in the backup mode to ensure the continuity and stability of the system power supply.

[0004] The inverter is usually composed of field effect transistors, and the field effect transistors will generate turn-off spike voltages. If the spike voltage is too large, voltage breakdown will occur, causing the field effect transistors to be damaged, thereby affecting the normal use of the uninterruptible power supply system. Therefore, an uninterruptible power supply system that suppresses the spike voltage generated by the inverter is needed. Summary of the Invention

[0005] In view of this, the present invention provides an uninterruptible power supply system, mainly aiming to solve the problem that the current uninterruptible power supply system does not suppress the spike voltage generated by the inverter.

[0006] To solve the above problems, the present application provides an uninterruptible power supply system, which includes a rectification module, an inversion module, a buffer module, a static switch module, a bypass module, and a controller. Among them,

[0007] The input end of the rectification module is electrically connected to the mains AC power supply, the output end of the rectification module is electrically connected to the input end of the inversion module, the output end of the inversion module is respectively electrically connected to the first end of the static switch module, the input end of the buffer module, and the first end of the load. The input end of the buffer module is also electrically connected to the output end of the rectification module. The second end of the static switch module is electrically connected to the second end of the load. The inverter drive signal output pin of the controller is electrically connected to the control end of the inversion module. The switch drive signal output pin of the controller is electrically connected to the control end of the static switch module. The input end of the bypass module is electrically connected to the standby AC power supply, and the output end of the bypass module is respectively electrically connected to the first end of the static switch module and the second end of the load;

[0008] The rectification module is used to convert the mains AC power supply into a DC power supply, the inversion module is used to convert the DC power supply into an AC power supply, the buffer module is used to suppress the spike voltage generated by the inversion module, the bypass module is used to provide a standby AC power supply when the mains AC power supply is cut off, the static switch module is used to switch the bypass module to supply power to the load when the mains AC power supply is cut off, and the controller is used to provide an inversion drive signal for the inversion module and a switch drive signal for the static switch module.

[0009] In an embodiment of the present invention, optionally, the inversion drive signal output pins of the controller include a first drive signal output pin, a second drive signal output pin, a third drive signal output pin, and a fourth drive signal output pin. The inversion module includes: a first IGBT drive unit, a second IGBT drive unit, a third IGBT drive unit, a fourth IGBT drive unit, a first IGBT, a second IGBT, a third IGBT, and a fourth IGBT, where

[0010] The input end of the first IGBT drive unit is electrically connected to the first drive signal output pin of the controller. The input end of the second IGBT drive unit is electrically connected to the second drive signal output pin of the controller. The output end of the first IGBT drive unit is electrically connected to the control end of the first IGBT. The first end of the first IGBT is electrically connected to the positive output end of the rectification module. The second end of the first IGBT is electrically connected to the first end of the second IGBT. The second end of the second IGBT is electrically connected to the negative output end of the rectification module. The control end of the second IGBT is electrically connected to the output end of the second IGBT drive unit;

[0011] The input end of the third IGBT drive unit is electrically connected to the third drive signal output pin of the controller. The input end of the fourth IGBT drive unit is electrically connected to the fourth drive signal output pin of the controller. The output end of the third IGBT drive unit is electrically connected to the control end of the third IGBT. The first end of the third IGBT is electrically connected to the positive output end of the rectification module. The second end of the third IGBT is electrically connected to the first end of the fourth IGBT. The second end of the fourth IGBT is electrically connected to the negative output end of the rectification module. The control end of the fourth IGBT is electrically connected to the output end of the fourth IGBT drive unit.

[0012] In an embodiment of the present invention, optionally, the buffer module includes: a first diode, a second diode, a third diode, a fourth diode, a fifth diode, a sixth diode, a seventh diode, an eighth diode, a first capacitor, a second capacitor, a third capacitor, a fourth capacitor, a first resistor, a second resistor, a third resistor, and a fourth resistor, wherein,

[0013] The negative electrode of the first diode is electrically connected to the positive output terminal of the rectification module. The positive electrode of the first diode is respectively electrically connected to the negative electrode of the second diode, the second terminal of the first IGBT, and the first terminal of the second IGBT. The positive electrode of the second diode is electrically connected to the negative output terminal of the rectification module. The first terminal of the first capacitor is electrically connected to the positive output terminal of the rectification module. The second terminal of the first capacitor is electrically connected to the positive electrode of the third diode. The negative electrode of the third diode is respectively electrically connected to the positive electrode of the fourth diode, the positive electrode of the first diode, and the negative electrode of the second diode. The negative electrode of the fourth diode is electrically connected to the first terminal of the second capacitor. The second terminal of the second capacitor is electrically connected to the negative output terminal of the rectification module. The first terminal of the first resistor is electrically connected to the positive output terminal of the rectification module. The second terminal of the first resistor is respectively electrically connected to the negative electrode of the fourth diode and the first terminal of the second capacitor. The first terminal of the second resistor is respectively electrically connected to the positive electrode of the third diode and the second terminal of the first capacitor. The second terminal of the second resistor is electrically connected to the negative output terminal of the rectification module;

[0014] The negative electrode of the fifth diode is electrically connected to the positive output terminal of the rectification module. The positive electrode of the fifth diode is respectively electrically connected to the negative electrode of the sixth diode, the second terminal of the third IGBT, and the first terminal of the fourth IGBT. The positive electrode of the sixth diode is electrically connected to the negative output terminal of the rectification module. The first terminal of the third capacitor is electrically connected to the positive output terminal of the rectification module. The second terminal of the third capacitor is electrically connected to the positive electrode of the seventh diode. The negative electrode of the seventh diode is respectively electrically connected to the positive electrode of the eighth diode, the positive electrode of the fifth diode, and the negative electrode of the sixth diode. The negative electrode of the eighth diode is electrically connected to the first terminal of the fourth capacitor. The second terminal of the fourth capacitor is electrically connected to the negative output terminal of the rectification module. The first terminal of the third resistor is electrically connected to the positive output terminal of the rectification module. The second terminal of the third resistor is respectively electrically connected to the negative electrode of the eighth diode and the first terminal of the fourth capacitor. The first terminal of the fourth resistor is respectively electrically connected to the positive electrode of the seventh diode and the second terminal of the third capacitor. The second terminal of the fourth resistor is electrically connected to the negative output terminal of the rectification module.

[0015] In an embodiment of the present invention, optionally, the uninterruptible power supply system further includes a battery module. The battery module includes a battery, a battery switch, and a ninth diode. The output end of the battery is electrically connected to the first end of the battery switch. The second end of the battery switch is electrically connected to the positive electrode of the ninth diode. The negative electrode of the ninth diode is electrically connected to the input end of the inverter module. The control end of the battery switch is electrically connected to the first control signal output pin of the controller.

[0016] In an embodiment of the present invention, optionally, an output control switch is provided between the second end of the static switch module and the second end of the load. The first end of the output control switch is electrically connected to the second end of the static switch module. The second end of the output control switch is electrically connected to the second end of the load. The control end of the output control switch is electrically connected to the second control signal output pin of the controller.

[0017] In an embodiment of the present invention, optionally, the static switch module includes a first group of thyristors connected in antiparallel and a second group of thyristors connected in antiparallel. The first end of the first group of thyristors connected in antiparallel is electrically connected to the output end of the inverter module. The second end of the first group of thyristors connected in antiparallel is electrically connected to the first end of the output control switch. The first end of the second group of thyristors connected in antiparallel is electrically connected to the output end of the bypass module. The second end of the second group of thyristors connected in antiparallel is electrically connected to the first end of the output control switch. The control ends of the first group of thyristors connected in antiparallel and the second group of thyristors connected in antiparallel are both electrically connected to the switch drive signal output pin of the controller.

[0018] In an embodiment of the present invention, optionally, the bypass module includes: a standby bypass switch and a maintenance bypass switch. The first end of the standby bypass switch is electrically connected to a standby AC power supply. The second end of the standby bypass switch is electrically connected to the first end of the second group of thyristors connected in antiparallel. The second end of the second group of thyristors connected in antiparallel is electrically connected to the first end of the output control switch. The first end of the maintenance bypass switch is electrically connected to the standby AC power supply. The second end of the maintenance bypass switch is electrically connected to the second end of the output control switch.

[0019] In an embodiment of the present invention, optionally, a mains input switch and an input transformer are provided between the input end of the rectifier module and the mains AC power supply. The first end of the mains input switch is electrically connected to the mains AC power supply. The second end of the mains input switch is electrically connected to the input end of the input transformer. The output end of the input transformer is electrically connected to the input end of the rectifier module.

[0020] In an embodiment of the present invention, optionally, an output transformer is provided between the output terminal of the inverter module and the first terminal of the static switch module. The input terminal of the output transformer is electrically connected to the output terminal of the inverter module, and the output terminal of the output transformer is electrically connected to the first terminal of the static switch module.

[0021] In an embodiment of the present invention, optionally, the rectification module is a solid-state rectifier.

[0022] Beneficial effects in this application: An uninterruptible power supply system provided by the present invention is provided with a buffer module. The buffer module is connected to the output terminal of the inverter module. The buffer module suppresses the spike voltage generated by the inverter module, reduces the damage rate of the inverter module, extends the service life of the inverter module, and also improves the power quality of the output of the uninterruptible power supply.

[0023] The above description is only an overview of the technical solution of the present invention. In order to be able to understand the technical means of the present invention more clearly, it can be implemented according to the content of the description. And in order to make the above and other objects, features and advantages of the present invention more obvious and understandable, the following specifically illustrates the specific embodiments of the present invention. Description of the Drawings

[0024] By reading the following detailed description of the preferred embodiments, various other advantages and benefits will become clear to those of ordinary skill in the art. The drawings are only for the purpose of showing the preferred embodiments and are not considered to be a limitation of the present invention. And throughout the drawings, the same reference numerals are used to represent the same components. In the drawings:

[0025] Figure 1 It is a structural block diagram of an uninterruptible power supply system according to an exemplary embodiment of the present invention;

[0026] Figure 2 It is a circuit structure schematic diagram of an inverter module of an uninterruptible power supply system according to an exemplary embodiment of the present invention;

[0027] Figure 3 It is a circuit structure schematic diagram of a buffer module of an uninterruptible power supply system according to an exemplary embodiment of the present invention;

[0028] Figure 4 It is a connection schematic diagram of an uninterruptible power supply system according to an exemplary embodiment of the present invention;

[0029] Among them,

[0030] Figures 1 - 4The reference numerals are as follows: 11 - rectifier module, 12 - inverter module, 13 - buffer module, 14 - static switch module; 15 - bypass module; 16 - controller; 17 - storage battery; 20 - mains AC power supply; 30 - standby AC power supply; 40 - load; 121 - first IGBT drive unit; 122 - second IGBT drive unit; 123 - third IGBT drive unit; 124 - fourth IGBT drive unit; 125 - first IGBT; 126 - second IGBT; 127 - third IGBT; 128 - fourth IGBT; D1 - first diode; D2 - second diode; D3 - third diode; D4 - fourth diode; D5 - fifth diode; D6 - sixth diode; D7 - seventh diode; D8 - eighth diode; D9 - ninth diode; R1 - first resistor; R2 - second resistor; R3 - third resistor; R4 - fourth resistor; C1 - first capacitor; C2 - second capacitor; C3 - third capacitor; C4 - fourth capacitor; Q1 - output control switch; Q2 - maintenance bypass switch; Q3 - standby bypass switch; Q4 - mains input switch; Q5 - storage battery switch; TZF - input transformer; TF - output transformer. Detailed implementation manners

[0031] In the following, the present invention will be described in detail with reference to the drawings and in conjunction with embodiments. It should be noted that, without conflict, the embodiments in the present invention and the features in the embodiments may be combined with each other.

[0032] To further elaborate on the technical means and effects adopted by the present invention to achieve the intended invention purpose, the following describes in detail the specific implementation manners, structures, features, and effects of the application according to the present invention with reference to the drawings and preferred embodiments. In the following description, different "one embodiment" or "embodiment" does not necessarily refer to the same embodiment. In addition, the specific features, structures, or characteristics in one or more embodiments may be combined in any suitable form.

[0033] The following combines with Figures 1 to 4 Describe an uninterruptible power supply system proposed according to some embodiments of the present invention.

[0034] In one embodiment, as Figure 1As shown in the figure, an uninterruptible power supply system includes a rectification module 11, an inversion module 12, a buffer module 13, a static switch module 14, a bypass module 15, and a controller 16. Among them, the input end of the rectification module 11 is electrically connected to the mains AC power supply 20, the output end of the rectification module 11 is electrically connected to the input end of the inversion module 12, the output end of the inversion module 12 is respectively electrically connected to the first end of the static switch module 14, the input end of the buffer module 13, and the first end of the load. The input end of the buffer module 13 is also electrically connected to the output end of the rectification module 11. The second end of the static switch module 14 is electrically connected to the second end of the load 40. The inversion drive signal output pin of the controller 16 is electrically connected to the control end of the inversion module 12, and the switch drive signal output pin of the controller 16 is electrically connected to the control end of the static switch module 14. The input end of the bypass module 15 is electrically connected to the standby AC power supply 30, and the output end of the bypass module 15 is respectively electrically connected to the first end of the static switch module 14 and the second end of the load 40. The rectification module 11 is used to convert the mains AC power supply into a DC power supply, the inversion module 12 is used to convert the DC power supply into an AC power supply, the buffer module 13 is used to suppress the spike voltage generated by the inversion module 12, the bypass module 15 is used to provide a standby AC power supply when the mains AC power supply is cut off, the static switch module 14 is used to switch the bypass module 15 to supply power to the load 40 when the mains AC power supply 20 is cut off, and the controller 16 is used to provide an inversion drive signal for the inversion module 12 and a switch drive signal for the static switch module 14.

[0035] Specifically, the rectification module converts the mains AC power supply into a DC power supply and transmits it to the inversion module. The inversion module converts the DC power supply into an AC power supply. The buffer module suppresses the spike voltage generated by the inversion module. The AC power supply that suppresses the spike voltage is transmitted to the static switch module and then to the load. When the mains AC power supply fails, the controller outputs a switch drive signal to the static switch module, and the static switch module switches to the bypass module, and uses the standby AC power supply provided by the bypass module to supply power to the load.

[0036] Compared with the prior art, an uninterruptible power supply system provided by the present invention is provided with a buffer module. The buffer module is connected to the output end of the inversion module. The buffer module suppresses the spike voltage generated by the inversion module, reduces the damage rate of the inversion module, extends the service life of the inversion module, and improves the power quality of the output of the uninterruptible power supply at the same time.

[0037] In one embodiment, refer to Figure 2, the inverter drive signal output pins of the controller include a first drive signal output pin, a second drive signal output pin, a third drive signal output pin, and a fourth drive signal output pin. The inverter module includes: a first IGBT drive unit 121, a second IGBT drive unit 122, a third IGBT drive unit 123, a fourth IGBT drive unit 124, a first IGBT 125, a second IGBT 126, a third IGBT 127, and a fourth IGBT 128. Among them,

[0038] The input end of the first IGBT drive unit 121 is electrically connected to the first drive signal output pin of the controller 16. The input end of the second IGBT drive unit 122 is electrically connected to the second drive signal output pin of the controller 16. The output end of the first IGBT drive unit 121 is electrically connected to the control end of the first IGBT 125. The first end of the first IGBT 125 is electrically connected to the positive output end of the rectification module 11. The second end of the first IGBT 125 is electrically connected to the first end of the second IGBT 126. The second end of the second IGBT 126 is electrically connected to the negative output end of the rectification module 11. The control end of the second IGBT 126 is electrically connected to the output end of the second IGBT drive unit 122;

[0039] The input end of the third IGBT drive unit 123 is electrically connected to the third drive signal output pin of the controller 11. The input end of the fourth IGBT drive unit 124 is electrically connected to the fourth drive signal output pin of the controller 11. The output end of the third IGBT drive unit 123 is electrically connected to the control end of the third IGBT 127. The first end of the third IGBT 127 is electrically connected to the positive output end of the rectification module 11. The second end of the third IGBT 127 is electrically connected to the first end of the fourth IGBT 128. The second end of the fourth IGBT 128 is electrically connected to the negative output end of the rectification module 11. The control end of the fourth IGBT 124 is electrically connected to the output end of the fourth IGBT drive unit 124.

[0040] Specifically, the inverter module adopts IGBT magnetic parallel technology. There is no direct parallel relationship between any two IGBTs. The CE voltage of each IGBT can be sampled separately, and each IGBT can be controlled and protected separately. At the same time, the inverter module uses magnetic circuit parallel connection and full-automatic current limiting characteristics to automatically equalize the current through its conjugate inductance, improving its parallel performance, fault protection performance, and frequency response performance. At the same time, it also has advantages such as low distortion of the output power supply waveform, high accuracy, and good dynamic characteristics.

[0041] As a preferred embodiment, see Figure 3, the buffer module includes: the first diode D1, the second diode D2, the third diode D3, the fourth diode D4, the fifth diode D5, the sixth diode D6, the seventh diode D7, the eighth diode D8, the first capacitor C1, the second capacitor C2, the third capacitor C3, the fourth capacitor C4, the first resistor R1, the second resistor R2, the third resistor R3 and the fourth resistor R4, where

[0042] The negative electrode of the first diode D1 is electrically connected to the positive output terminal of the rectification module 11. The positive electrode of the first diode D1 is respectively electrically connected to the negative electrode of the second diode D2, the second terminal of the first IGBT 125, and the first terminal of the second IGBT 126. The positive electrode of the second diode D2 is electrically connected to the negative output terminal of the rectification module 11. The first terminal of the first capacitor C1 is electrically connected to the positive output terminal of the rectification module 11. The second terminal of the first capacitor C1 is electrically connected to the positive electrode of the third diode D3. The negative electrode of the third diode D3 is respectively electrically connected to the positive electrode of the fourth diode D4, the positive electrode of the first diode D1, and the negative electrode of the second diode D2. The negative electrode of the fourth diode D4 is electrically connected to the first terminal of the second capacitor C2. The second terminal of the second capacitor C2 is electrically connected to the negative output terminal of the rectification module 11. The first terminal of the first resistor R1 is electrically connected to the positive output terminal of the rectification module 11. The second terminal of the first resistor R1 is respectively electrically connected to the negative electrode of the fourth diode D4 and the first terminal of the second capacitor C2. The first terminal of the second resistor R2 is respectively electrically connected to the positive electrode of the third diode D3 and the second terminal of the first capacitor C1. The second terminal of the second resistor R2 is electrically connected to the negative output terminal of the rectification module 11;

[0043] The negative electrode of the fifth diode D5 is electrically connected to the positive output terminal of the rectification module 11. The positive electrode of the fifth diode D5 is respectively electrically connected to the negative electrode of the sixth diode D6, the second terminal of the third IGBT 127, and the first terminal of the fourth IGBT 128. The positive electrode of the sixth diode D6 is electrically connected to the negative output terminal of the rectification module 11. The first terminal of the third capacitor C3 is electrically connected to the positive output terminal of the rectification module 11. The second terminal of the third capacitor C3 is electrically connected to the positive electrode of the seventh diode D7. The negative electrode of the seventh diode D7 is respectively electrically connected to the positive electrode of the eighth diode D8, the positive electrode of the fifth diode D5, and the negative electrode of the sixth diode D6. The negative electrode of the eighth diode D8 is electrically connected to the first terminal of the fourth capacitor C4. The second terminal of the fourth capacitor C4 is electrically connected to the negative output terminal of the rectification module 11. The first terminal of the third resistor R3 is electrically connected to the positive output terminal of the rectification module 11. The second terminal of the third resistor R3 is respectively electrically connected to the negative electrode of the eighth diode D8 and the first terminal of the fourth capacitor C4. The first terminal of the fourth resistor R4 is respectively electrically connected to the positive electrode of the seventh diode D7 and the second terminal of the third capacitor C3. The second terminal of the fourth resistor R4 is electrically connected to the negative output terminal of the rectification module 11.

[0044] Specifically, the diode can clamp the transient voltage, suppress the occurrence of oscillation. The buffer circuit is directly connected to the collector and emitter of each IGBT, with a small parasitic inductance, which can effectively suppress the spike voltage and improve the power quality of the uninterruptible power supply output.

[0045] In one embodiment, referring to Figure 4 , the uninterruptible power supply system further includes a battery module. The battery module includes a battery 17, a battery switch Q5, and a ninth diode D9. The output terminal of the battery 17 is electrically connected to the first terminal of the battery switch Q5. The second terminal of the battery switch Q5 is electrically connected to the positive electrode of the ninth diode D9. The negative electrode of the ninth diode D9 is electrically connected to the input terminal of the inverter module 12. The control terminal of the battery switch Q5 is electrically connected to the first control signal output pin of the controller 16.

[0046] Specifically, when the mains AC power supply fails, the controller outputs a first control signal to the battery switch according to the signal fed back by the detection circuit, so that the battery provides an inverter power supply for the inverter module to generate an uninterruptible power supply.

[0047] In one embodiment, referring to Figure 4 , an output control switch Q1 is provided between the second terminal of the static switch module 14 and the second terminal of the load 40. The first terminal of the output control switch Q1 is electrically connected to the second terminal of the static switch module 14. The second terminal of the output control switch Q1 is electrically connected to the second terminal of the load 40. The control terminal of the output control switch Q1 is electrically connected to the second control signal output pin of the controller 16.

[0048] Specifically, an output control switch is provided between the second terminal of the static switch module and the second terminal of the load. The controller controls the connection and disconnection of the output control switch to output power to the load.

[0049] In one embodiment, the static switch module 14 includes a first group of thyristors connected in reverse parallel and a second group of thyristors connected in reverse parallel. The first terminal of the first group of thyristors connected in reverse parallel is electrically connected to the output terminal of the inverter module 12. The second terminal of the first group of thyristors connected in reverse parallel is electrically connected to the first terminal of the output control switch Q1. The first terminal of the second group of thyristors connected in reverse parallel is electrically connected to the output terminal of the bypass module 15. The second terminal of the second group of thyristors connected in reverse parallel is electrically connected to the first terminal of the output control switch Q1. The control terminals of the first group of thyristors connected in reverse parallel and the second group of thyristors connected in reverse parallel are both electrically connected to the switch drive signal output pin of the controller 16.

[0050] Specifically, the static switch module includes a first set of thyristors connected in antiparallel and a second set of thyristors connected in antiparallel. The first set of thyristors connected in antiparallel is connected to the inverter module, and the first set of thyristors connected in antiparallel is connected to the bypass module. When the mains AC power supply is cut off, the controller outputs a switch drive signal to the thyristors of the static switch according to the signal fed back by the detection circuit, so that the second set of thyristors connected in antiparallel works, that is, it switches to the bypass standby power supply for operation. When the controller outputs a switch drive signal to the thyristors of the static switch according to the signal fed back by the detection circuit, the first set of thyristors connected in antiparallel works, that is, it switches to the mains AC power supply for operation.

[0051] It should be noted that the principle of the detection circuit is prior art and will not be elaborated here.

[0052] In one embodiment, see Figure 4 , the bypass module includes: a standby bypass switch Q3 and a maintenance bypass switch Q2. The first end of the standby bypass switch Q3 is electrically connected to the standby AC power supply 30. The second end of the standby bypass switch Q3 is electrically connected to the first end of the second set of thyristors connected in antiparallel. The second end of the second set of thyristors connected in antiparallel is electrically connected to the first end of the output control switch Q1. The first end of the maintenance bypass switch Q2 is electrically connected to the standby AC power supply 30. The second end of the maintenance bypass switch Q2 is electrically connected to the second end of the output control switch Q1.

[0053] Specifically, the bypass module includes a standby bypass branch and a maintenance bypass branch. A standby bypass switch is provided on the standby bypass branch. The input end of the standby bypass branch is connected to the standby AC power supply. The output end of the standby bypass branch is connected to the first end of the second set of thyristors connected in antiparallel. When the mains AC power supply is cut off, the controller outputs a switch drive signal to the thyristors of the static switch according to the signal fed back by the detection circuit, so that the second set of thyristors connected in antiparallel works, that is, it switches to the bypass standby power supply for operation. When the controller outputs a switch drive signal to the thyristors of the static switch according to the signal fed back by the detection circuit, the first set of thyristors connected in antiparallel works, that is, it switches to the mains AC power supply for operation.

[0054] A maintenance bypass switch is provided on the maintenance bypass branch. The input end of the maintenance bypass branch is connected to the standby AC power supply. The output end of the maintenance bypass branch is connected to the second end of the load. When maintenance is carried out, the load is directly powered through the maintenance bypass branch.

[0055] In one embodiment, see Figure 4, a mains input switch Q4 and an input transformer TZF are provided between the input end of the rectification module 11 and the mains AC power supply 20. The first end of the mains input switch Q4 is electrically connected to the mains AC power supply, the second end of the mains input switch Q4 is electrically connected to the input end of the input transformer TZF, and the output end of the input transformer TZF is electrically connected to the input end of the rectification module 11.

[0056] In this embodiment, specifically, a mains input switch and an input transformer are provided between the input end of the rectification module and the mains AC power supply. The input transformer slightly adjusts the voltage output by the rectification module and transforms it into a preset voltage that fully meets the requirements of the inversion module.

[0057] In one embodiment, refer to Figure 4 , an output transformer TF is provided between the output end of the inversion module 12 and the first end of the static switch module 14. The input end of the output transformer TF is electrically connected to the output end of the inversion module 12, and the output end of the output transformer TF is electrically connected to the first end of the static switch module 14.

[0058] Specifically, an output transformer is provided between the output end of the inversion module and the first end of the static switch module. The output transformer slightly adjusts the voltage output by the inversion module and transforms it into a preset voltage that fully meets the output requirements.

[0059] As a preferred embodiment, the rectification module 11 is a solid-state rectifier.

[0060] Specifically, the solid-state rectifier has a full-automatic load limiting characteristic and an inrush current suppression function, and provides a stable DC voltage for the inverter.

[0061] It should be understood that various modifications can be made to the embodiments applied herein. Therefore, the above description should not be regarded as a limitation, but only as an example of the embodiments. Those skilled in the art will think of other modifications within the scope and spirit of this application.

[0062] The accompanying drawings included in the specification and constituting a part of the specification illustrate the embodiments of this application, and together with the general description of this application given above and the detailed description of the embodiments given below are used to explain the principles of this application.

[0063] These and other features of this application will become apparent from the following description of the preferred forms of the embodiments given as non-limiting examples with reference to the accompanying drawings.

[0064] It should also be understood that although this application has been described with reference to some specific examples, those skilled in the art can surely implement many other equivalent forms of this application.

[0065] When taken in conjunction with the accompanying drawings, the above and other aspects, features, and advantages of the present application will become more apparent in light of the following detailed description.

[0066] Specific embodiments of the present application will hereinafter be described with reference to the accompanying drawings; however, it should be understood that the embodiments claimed are merely examples of the present application, which may be implemented in various ways. Well-known and / or repetitive functions and structures are not described in detail to avoid obscuring the present application with unnecessary or redundant details. Thus, the specific structural and functional details claimed herein are not intended to be limiting, but rather are merely a basis and representative basis for the claims to teach those skilled in the art to use the present application in substantially any suitable detailed structure in a variety of ways.

[0067] This specification may use the phrase "in one embodiment", "in another embodiment", "in yet another embodiment", or "in other embodiments", each of which may refer to one or more of the same or different embodiments of the present application.

[0068] The above embodiments are only exemplary embodiments of the present application and are not used to limit the present application. The protection scope of the present application is defined by the claims. Those skilled in the art can make various modifications or equivalent replacements within the spirit and protection scope of the present application, and such modifications or equivalent replacements should also be regarded as falling within the protection scope of the present application.

Claims

1. An uninterruptible power supply system, characterized in that, The uninterruptible power supply system includes a rectification module, an inversion module, a buffer module, a static switch module, a bypass module and a controller. Among them, The input end of the rectification module is electrically connected to the mains AC power supply, the output end of the rectification module is electrically connected to the input end of the inversion module, the output end of the inversion module is respectively electrically connected to the first end of the static switch module, the input end of the buffer module and the first end of the load, the input end of the buffer module is also electrically connected to the output end of the rectification module, the second end of the static switch module is electrically connected to the second end of the load, the inversion drive signal output pin of the controller is electrically connected to the control end of the inversion module, the switch drive signal output pin of the controller is electrically connected to the control end of the static switch module, the input end of the bypass module is electrically connected to the standby AC power supply, and the output end of the bypass module is respectively electrically connected to the first end of the static switch module and the second end of the load; The rectification module is used to convert the mains AC power supply into a DC power supply, the inversion module is used to convert the DC power supply into an AC power supply, the buffer module is used to suppress the spike voltage generated by the inversion module, the bypass module is used to provide a standby AC power supply when the mains AC power supply is cut off, the static switch module is used to switch the bypass module to supply power to the load when the mains AC power supply is cut off, and the controller is used to provide an inversion drive signal for the inversion module and a switch drive signal for the static switch module; The inversion module includes: a first IGBT, a second IGBT, a third IGBT and a fourth IGBT; The buffer module includes: a first diode, a second diode, a third diode, a fourth diode, a fifth diode, a sixth diode, a seventh diode, an eighth diode, a first capacitor, a second capacitor, a third capacitor, a fourth capacitor, a first resistor, a second resistor, a third resistor and a fourth resistor. Among them, The negative electrode of the first diode is electrically connected to the positive output terminal of the rectification module. The positive electrode of the first diode is electrically connected to the negative electrode of the second diode, the second terminal of the first IGBT, and the first terminal of the second IGBT respectively. The positive electrode of the second diode is electrically connected to the negative output terminal of the rectification module. The first terminal of the first capacitor is electrically connected to the positive output terminal of the rectification module. The second terminal of the first capacitor is electrically connected to the positive electrode of the third diode. The negative electrode of the third diode is electrically connected to the positive electrode of the fourth diode, the positive electrode of the first diode, and the negative electrode of the second diode respectively. The negative electrode of the fourth diode is electrically connected to the first terminal of the second capacitor. The second terminal of the second capacitor is electrically connected to the negative output terminal of the rectification module. The first terminal of the first resistor is electrically connected to the positive output terminal of the rectification module. The second terminal of the first resistor is electrically connected to the negative electrode of the fourth diode and the first terminal of the second capacitor respectively. The first terminal of the second resistor is electrically connected to the positive electrode of the third diode and the second terminal of the first capacitor respectively. The second terminal of the second resistor is electrically connected to the negative output terminal of the rectification module; The negative electrode of the fifth diode is electrically connected to the positive output terminal of the rectification module. The positive electrode of the fifth diode is electrically connected to the negative electrode of the sixth diode, the second terminal of the third IGBT, and the first terminal of the fourth IGBT respectively. The positive electrode of the sixth diode is electrically connected to the negative output terminal of the rectification module. The first terminal of the third capacitor is electrically connected to the positive output terminal of the rectification module. The second terminal of the third capacitor is electrically connected to the positive electrode of the seventh diode. The negative electrode of the seventh diode is electrically connected to the positive electrode of the eighth diode, the positive electrode of the fifth diode, and the negative electrode of the sixth diode respectively. The negative electrode of the eighth diode is electrically connected to the first terminal of the fourth capacitor. The second terminal of the fourth capacitor is electrically connected to the negative output terminal of the rectification module. The first terminal of the third resistor is electrically connected to the positive output terminal of the rectification module. The second terminal of the third resistor is electrically connected to the negative electrode of the eighth diode and the first terminal of the fourth capacitor respectively. The first terminal of the fourth resistor is electrically connected to the positive electrode of the seventh diode and the second terminal of the third capacitor respectively. The second terminal of the fourth resistor is electrically connected to the negative output terminal of the rectification module; An output transformer is provided between the output terminal of the inversion module and the first terminal of the static switch module. The input terminal of the output transformer is electrically connected to the output terminal of the inversion module. The output terminal of the output transformer is electrically connected to the first terminal of the static switch module.

2. The uninterruptible power supply system according to claim 1, wherein The inversion drive signal output pins of the controller include a first drive signal output pin, a second drive signal output pin, a third drive signal output pin, and a fourth drive signal output pin. The inversion module further includes: a first IGBT drive unit, a second IGBT drive unit, a third IGBT drive unit, and a fourth IGBT drive unit, where, The input end of the first IGBT driving unit is electrically connected to the first driving signal output pin of the controller. The input end of the second IGBT driving unit is electrically connected to the second driving signal output pin of the controller. The output end of the first IGBT driving unit is electrically connected to the control end of the first IGBT. The first end of the first IGBT is electrically connected to the positive output end of the rectification module. The second end of the first IGBT is electrically connected to the first end of the second IGBT. The second end of the second IGBT is electrically connected to the negative output end of the rectification module. The control end of the second IGBT is electrically connected to the output end of the second IGBT driving unit; The input end of the third IGBT driving unit is electrically connected to the third driving signal output pin of the controller. The input end of the fourth IGBT driving unit is electrically connected to the fourth driving signal output pin of the controller. The output end of the third IGBT driving unit is electrically connected to the control end of the third IGBT. The first end of the third IGBT is electrically connected to the positive output end of the rectification module. The second end of the third IGBT is electrically connected to the first end of the fourth IGBT. The second end of the fourth IGBT is electrically connected to the negative output end of the rectification module. The control end of the fourth IGBT is electrically connected to the output end of the fourth IGBT driving unit.

3. The uninterruptible power supply system according to claim 1, wherein The uninterruptible power supply system further includes a battery module. The battery module includes a battery, a battery switch, and a ninth diode. The output end of the battery is electrically connected to the first end of the battery switch. The second end of the battery switch is electrically connected to the positive electrode of the ninth diode. The negative electrode of the ninth diode is electrically connected to the input end of the inverter module. The control end of the battery switch is electrically connected to the first control signal output pin of the controller.

4. The uninterruptible power supply system according to claim 1, characterized in that, An output control switch is provided between the second end of the static switch module and the second end of the load. The first end of the output control switch is electrically connected to the second end of the static switch module. The second end of the output control switch is electrically connected to the second end of the load. The control end of the output control switch is electrically connected to the second control signal output pin of the controller.

5. The uninterruptible power supply system according to claim 4, characterized in that, The static switch module includes a first group of thyristors connected in antiparallel and a second group of thyristors connected in antiparallel. The first end of the first group of thyristors connected in antiparallel is electrically connected to the output end of the inverter module. The second end of the first group of thyristors connected in antiparallel is electrically connected to the first end of the output control switch. The first end of the second group of thyristors connected in antiparallel is electrically connected to the output end of the bypass module. The second end of the second group of thyristors connected in antiparallel is electrically connected to the first end of the output control switch. The control ends of the first group of thyristors connected in antiparallel and the second group of thyristors connected in antiparallel are both electrically connected to the switch driving signal output pin of the controller.

6. The uninterruptible power supply system according to claim 5, characterized in that, The bypass module includes: a standby bypass switch and a maintenance bypass switch. The first end of the standby bypass switch is electrically connected to a standby AC power supply. The second end of the standby bypass switch is electrically connected to the first end of a second group of thyristors connected in antiparallel. The second end of the second group of thyristors connected in antiparallel is electrically connected to the first end of the output control switch. The first end of the maintenance bypass switch is electrically connected to the standby AC power supply. The second end of the maintenance bypass switch is electrically connected to the second end of the output control switch.

7. The uninterruptible power supply system according to claim 1, wherein A mains input switch and an input transformer are provided between the input end of the rectification module and the mains AC power supply. The first end of the mains input switch is electrically connected to the mains AC power supply. The second end of the mains input switch is electrically connected to the input end of the input transformer. The output end of the input transformer is electrically connected to the input end of the rectification module.

8. The uninterruptible power supply system according to any one of claims 1-7, characterized in that, The rectification module is a solid-state rectifier.

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