Uninterruptible power supply and operating method thereof

Abstract

The present invention discloses an uninterruptible power supply and an operation method thereof. The uninterruptible power supply includes an input terminal for receiving input power and an output terminal coupled to a load, and includes: a switching unit, a charging unit, an energy storage unit, a conversion unit and a control unit. When there is input power, the switching unit provides a first output power to the output terminal, the charging unit converts the input power into a first power, provides the first power to the control unit, and charges the energy storage unit; when there is no input power, the conversion unit converts the power of the energy storage unit into a second output power, and provides the second output power to the output terminal; when there is no input power, the conversion unit provides the second power to the charging unit, so that the charging unit converts the second power to the first power, and provides the first power to the control unit.

Description

Technical Field

[0001] The present invention relates to an uninterruptible power supply and an operating method thereof, and in particular to an uninterruptible power supply with a circuit-saving structure and an operating method thereof. Background Art

[0002] With the continuous development of science and technology, the requirements of electrical equipment for power supply quality are getting higher and higher. In order to ensure the safety of electrical equipment, uninterruptible power supplies are highly valued. In order to meet the needs of use, the circuit architecture of uninterruptible power supplies is gradually developed in the direction of saving costs and reducing size.

[0003] See also Figure 1 , which is a block diagram of an uninterruptible power supply of the prior art. The uninterruptible power supply 100A of the prior art includes a switching unit 10A, a charging unit 20A, an energy storage unit 30A, a conversion unit 40A, a switching power supply unit SPS and a control unit 50A. When there is an input power supply Vin, the charging unit 20A receives the input power supply Vin and converts the input power supply Vin to charge the energy storage unit 30A. At the same time, the switching power supply unit SPS receives the output power of the charging unit 20A and converts the output power of the charging unit 20A to supply to the control unit 50A. When there is no input power supply Vin, the switching power supply unit SPS receives the output power of the energy storage unit 30A and converts the output power of the energy storage unit 30A to supply to the control unit 50A.

[0004] However, since the power supplied from the energy storage unit 30A to the control unit 50A must be converted by a conversion circuit (here, the switching power supply unit SPS) to provide a stable working power supply that meets the normal operation requirements of the control unit 50A, in addition to the disadvantages that the size of the uninterruptible power supply cannot be reduced and the circuit cost cannot be reduced, the conversion of an additional conversion circuit will increase the loss and cannot meet the requirements of high efficiency and low loss. Therefore, how to design an uninterruptible power supply and its operating method, using an integrated conversion unit and a special connection relationship to save a conversion circuit, is a major issue that the inventor of this case wants to overcome and solve. Summary of the invention

[0005] In order to solve the above problems, the present invention provides an uninterruptible power supply to overcome the problems of the conventional technology. Therefore, the uninterruptible power supply of the present invention includes an input end for receiving input power, and an output end coupled to a load, and the uninterruptible power supply includes: a switching unit coupled to the input end. A charging unit coupled to the input end and the output end. An energy storage unit coupled to the charging unit. A conversion unit coupled to the charging unit and the energy storage unit. And a control unit coupled to the charging unit. Wherein, when there is an input power supply, the switching unit switches the input power supply to the first output power supply to the output end, the charging unit converts the input power supply to the first power supply, and provides the first power supply to the control unit, and charges the energy storage unit, and the conversion unit converts the power of the energy storage unit to the second output power supply, and provides the second output power supply to the output end; when there is no input power supply, the conversion unit provides the second power supply to the charging unit, so that the charging unit converts the second power supply to the first power supply, and provides the first power supply to the control unit.

[0006] In order to solve the above problems, the present invention provides an operating method of an uninterruptible power supply to overcome the problems of the conventional technology. Therefore, the uninterruptible power supply of the present invention receives an input power supply and provides a first output power supply or a second output power supply to a load, and the uninterruptible power supply includes a switching unit, a charging unit, an energy storage unit, a conversion unit and a control unit. The steps of the operating method include: (a) when there is an input power supply, the switching unit switches the input power supply to the first output power supply. (b) when there is an input power supply, the charging unit converts the input power supply to the first power supply, provides the first power supply to the control unit, and charges the energy storage unit. (c) when there is no input power supply, the conversion unit converts the power of the energy storage unit to the second output power supply. And (d) when there is no input power supply, the conversion unit converts the power of the energy storage unit to the second power supply, and provides the second power supply to the charging unit; the charging unit converts the second power supply to the first power supply, and provides the first power supply to the control unit.

[0007] In order to further understand the technology, means and effects adopted by the present invention to achieve the predetermined purpose, please refer to the following detailed description and drawings of the present invention. It is believed that the purpose, characteristics and features of the present invention can be understood in depth and in detail. However, the drawings are only provided for reference and explanation and are not intended to limit the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] Figure 1 A block diagram of an uninterruptible power supply in the prior art;

[0009] Figure 2 is a block diagram of an uninterruptible power supply of the present invention;

[0010] Figure 3A A circuit diagram of a first embodiment of an uninterruptible power supply of the present invention;

[0011] Figure 3B is a circuit diagram of a second embodiment of an uninterruptible power supply of the present invention; and

[0012] Figure 4 It is a flow chart of the operating method of the uninterruptible power supply of the present invention.

[0013] Among them, the reference numerals

[0014] [Existing Technology]

[0015] 100A...UPS

[0016] 10A...Switching unit

[0017] 20A...Charging unit

[0018] 30A...Energy storage unit

[0019] 40A...Conversion unit

[0020] SPS…Switching Power Supply

[0021] 50A...Control Unit

[0022] [The present invention]

[0023] 100, 100'...Uninterruptible Power Supply

[0024] 100-1…Input

[0025] 100-2…Output

[0026] 10, 10'…Switching unit

[0027] 12…Second rectifier unit

[0028] 14…The third DC conversion unit

[0029] 20…Charging unit

[0030] 22…First rectifier unit

[0031] 24…First DC conversion unit

[0032] 24-1…First input side

[0033] 24-2…First output side

[0034] 24-3…First transformer element

[0035] 30…Energy storage unit

[0036] 40, 40'...conversion unit

[0037] 42, 42' ... second DC conversion unit

[0038] 42-1…Second input side

[0039] 42-2…Second output side

[0040] 42-3…Second transformer element

[0041] 42-4…Filter element

[0042] 44…Inverter unit

[0043] 50…Control unit

[0044] 52…Isolation transformer

[0045] 54…Communication unit

[0046] 56…Controller

[0047] 60...Switch unit

[0048] D1…Diode

[0049] 200…Load

[0050] Vin…Input power supply

[0051] Vo1, Vo1'…First output power

[0052] Vo2, Vo2'…Second output power

[0053] V1…First power supply

[0054] V2…Second power supply

[0055] V3…Third power supply

[0056] Vc…Energy storage power supply

[0057] (S100) to (S160) ... steps DETAILED DESCRIPTION

[0058] The technical content and detailed description of the present invention are described below with reference to the accompanying drawings:

[0059] See also Figure 2, which is a block diagram of an uninterruptible power supply of the present invention. The uninterruptible power supply 100 has an input terminal 100-1 and an output terminal 100-2, the input terminal 100-1 receives an input power Vin, and the output terminal 100-2 is coupled to a load 200. The uninterruptible power supply 100 includes a switching unit 10, a charging unit 20, an energy storage unit 30, a conversion unit 40, and a control unit 50. One end of the switching unit 10 is coupled to the input terminal 100-1, and the other end is coupled to the output terminal 100-2. One end of the charging unit 20 is coupled to the input terminal 100-1, and the other end is coupled to the energy storage unit 30 and the control unit 50. A first end of the conversion unit 40 is coupled to the output terminal 100-2, and a second end is coupled to the energy storage unit 30. In addition, a third end of the conversion unit 40 is coupled to the charging unit 20, and provides a second power V2 to the charging unit 20. The specific location of the conversion unit 40 coupled to the charging unit 20 and the timing of providing the second power source V2 will be described in more detail below.

[0060] When there is an input power Vin, the switching unit 10 receives the input power Vin, and provides the first output power Vo1 to the output terminal 100-2 according to the input power Vin, so that the uninterruptible power supply 100 provides the first output power Vo1 as the power required for the operation of the load 200. At this time, the charging unit 20 receives the input power Vin, converts the input power Vin into the first power V1, and outputs the first power V1 to charge the energy storage unit 30. At the same time, the first power V1 output by the charging unit 20 is also provided to the control unit 50 to provide the power required for the operation of the control unit 50.

[0061] When there is no input power Vin, the energy storage unit 30 provides the energy storage power Vc to the conversion unit 40, wherein the energy storage power Vc is the electric energy stored in the energy storage unit 30 by the power supply of the input power Vin when there is input power Vin. The conversion unit 40 converts the energy storage power Vc into the second output power Vo2, and provides the second output power Vo2 to the output terminal 100-2, so that the uninterruptible power supply 100 provides the second output power Vo2 as the power required for the operation of the load 200. At this time, the conversion unit 40 provides the second power V2 to the charging unit 20 through the third terminal, and the charging unit 20 converts the second power V2 into the first power V1, and provides the first power V1 to the control unit 50, so as to provide the power required for the operation of the control unit 50.

[0062] The uninterruptible power supply 100 further includes a switch unit 60, one end of which is coupled to the charging unit 20, and the other end of which is coupled to the energy storage unit 30. When the switch unit 60 detects that there is an input power Vin, the switch unit 60 is turned on, so that the first power V1 can charge the energy storage unit 30 through the path turned on by the switch unit 60. When the switch unit 60 detects that there is no input power Vin, the switch unit 60 is turned off so that the path between the charging unit 20 and the energy storage unit 30 is open, so that the first power V1 output by the charging unit 20 cannot charge the energy storage unit 30. It is worth mentioning that in one embodiment of the present invention, the control of whether the switch unit 60 is turned on or not can be controlled by the control unit 50 detecting whether there is an input power Vin, and outputting a control signal to control the switch unit 60.

[0063] The control unit 50 includes an isolation transformer 52, a communication unit 54, and a controller 56. The controller 56 controls the normal operation of the uninterruptible power supply 100, and the user can set the operation mode of the uninterruptible power supply 100 or communicate with the communication interface of other electronic devices through the communication unit 54. Specifically, one end of the isolation transformer 52 is coupled to the charging unit 20, and the other end is coupled to the communication unit 54, so that the first power V1 provided by the charging unit 20 is coupled to the communication unit 54 through the isolation transformer 52 to provide the power required for the operation of the communication unit 54. The controller 56 is coupled to the charging unit 20, and the first power V1 provides the power required for the operation of the controller 56. Further, the communication unit 54 is usually disposed outside the uninterruptible power supply 100 (for example, but not limited to, the outer shell surface of the uninterruptible power supply 100), and the isolation transformer 52 is used as the electrical isolation between the primary side and the secondary side of the isolation transformer 52 to protect the power safety of the user when operating the uninterruptible power supply 100. The controller 56 is usually disposed inside the UPS 100 and outputs control signals to maintain the normal operation of each unit of the UPS 100. Therefore, under normal operation, the controller 56 is usually not touched by the user, and an isolation transformer may not be required. However, in actual application, it may be set according to the actual use requirements of the UPS 100.

[0064] Furthermore, as the power in the energy storage unit 30 is continuously consumed, the voltage value of the energy storage power source Vc will gradually decrease due to the continuous consumption of power in the energy storage unit 30. If the energy storage unit 30 directly provides the energy storage power source Vc to the control unit 50, it is possible that the voltage value of the energy storage power source Vc will decrease to the point where the control unit 50 cannot operate normally. Therefore, the energy storage power source Vc must pass through a primary conversion unit (in one embodiment of the present invention, the charging unit 20) to maintain the stability of the voltage value of the power source (in one embodiment of the present invention, the first power source V1) received by the control unit 50.

[0065] See also Figure 3A , which is a circuit diagram of the first embodiment of the uninterruptible power supply of the present invention, and is also referred to in conjunction with Figure 2 In this embodiment, the uninterruptible power supply 100 is an AC input-AC output type uninterruptible power supply, wherein the switching unit 10 is a switch element. When there is an input power supply Vin, the switching unit 10 is turned on, so that the input power supply Vin is the first output power supply Vo1, and is provided to the load 200 from the output terminal 100-2. When there is no input power supply Vin, the switching unit 10 is turned off, and the power is provided by the energy storage unit 30 through the conversion unit 40 to provide the second output power supply Vo2, and is provided to the load 200 through the output terminal 100-2. Therefore, regardless of whether there is an input power supply Vin, the load 200 can obtain the required power supply.

[0066] The charging unit 20 includes a first rectifying unit 22 and a first DC conversion unit 24. One end of the first rectifying unit 22 is coupled to the input end 100-1, and the other end is coupled to the first DC conversion unit 24. The first DC conversion unit 24 includes a first input side 24-1, a first output side 24-2 and a first voltage conversion element 24-3. The first input side 24-1 is coupled to the first rectifying unit 22 and the conversion unit 40, and the first output side 24-2 is coupled to the control unit 50 and coupled to the energy storage unit 30 through the switch unit 60. The first voltage conversion element 24-3 is coupled between the first input side 24-1 and the first output side 24-2, and provides the power of the first input side 24-1 to be coupled to the first output side 24-2 in an electromagnetic coupling manner. It is worth mentioning that in one embodiment of the present invention, the first DC conversion unit 24 is a flyback converter, which is mainly used to convert a large power source into a small power source (for example but not limited to, 180V into 12V), and uses the first transformer element 24-3 to provide electrical isolation between the large power source and the small power source, but is not limited to this. In other words, DC converters known in the art should all be included in the scope of this embodiment.

[0067] After the first rectifier unit 22 rectifies the input power Vin, the rectified input power Vin is provided to the first input side 24-1 of the first DC conversion unit 24. After the first DC conversion unit 24 converts the rectified input power Vin into the first power V1, the first power V1 is output through the first output side 24-2. Alternatively, after the first DC conversion unit 24 converts the power provided by the energy storage unit 30 into the first power V1 via the second power V2 provided by the conversion unit 40, the first DC conversion unit 24 outputs the first power V1 through the first output side 24-2.

[0068] When there is input power Vin, the switch unit 60 is turned on. The first DC conversion unit 24 converts the rectified input power Vin into the first power V1, and outputs the first power V1 through the first output side 24-2. The first power V1 is provided to the control unit 50 by the first output side 24-2, and charges the energy storage unit 30 through the switch unit 60.

[0069] When there is no input power Vin, the switch unit 60 is turned off to open the path between the first output side 24-2 and the energy storage unit 30. After the first DC conversion unit 24 converts the second power V2 into the first power V1, the first power V1 is output through the first output side 24-2. The first power V1 is provided to the control unit 50 by the first output side 24-2, but cannot charge the energy storage unit 30.

[0070] The conversion unit 40 includes a second DC conversion unit 42 and an inverter unit 44, and the second DC conversion unit 42 includes a second input side 42-1, a second output side 42-2 and a second voltage conversion element 42-3. The second input side 42-1 is coupled to the energy storage unit 30, and the second output side 42-2 (i.e. Figure 1 The third terminal of the conversion unit 40 is coupled to one terminal of the inverter unit 44 and the first input side 24-1 of the first DC conversion unit 24, and the other terminal of the inverter unit 44 is coupled to the output terminal 100-2. The second voltage conversion element 42-3 is coupled between the second input side 42-1 and the second output side 42-2, and provides the power of the second input side 42-1 to be coupled to the second output side 42-2 in an electromagnetic coupling manner.

[0071] When there is no input power Vin, the second DC conversion unit 42 converts the energy storage power Vc provided by the energy storage unit 30 into a second power V2, and provides it to the first input side 24-1 and the inverter unit 44 through the second output side 42-2. The inverter unit 44 inverts the second power V2 into a second output power Vo2, and provides it to the load 200 through the output terminal 100-2. It is worth mentioning that in one embodiment of the present invention, a diode D1 can be installed between the second output side 42-2 and the first input side 24-1 to prevent the power of the first input side 24-1 from flowing back to the second output side 42-2. In addition, in one embodiment of the present invention, the second DC conversion unit 42 is a push-pull converter, which is mainly used to convert a small power source into a large power source (for example but not limited to, 12V into 180V), and uses the second transformer 42-3 to provide electrical isolation between the small power source and the large power source, but is not limited to this. In other words, DC converters known in the art should all be included in the scope of this embodiment.

[0072] The second DC conversion unit 42 may include a filter element 42-4 (indicated by a dotted frame, such as but not limited to an inductor), the filter element 42-4 is coupled between the second transformer element 42-3 and the second output side 42-2, and filters the second power source V2. Specifically, when the filter element 42-4 is not installed, the second DC conversion unit 42 converts the DC energy storage power source Vc into a square wave second power source V2, and the second output side 42-2 provides the square wave second power source V2 to the first input side 24-1 and the inverter unit 44. The inverter unit 44 converts the square wave second power source V2 into a positive and negative square wave (similar to a sine wave) second output power source Vo2, and provides the second output power source Vo2 to the output terminal 100-2. When the filter element 42-4 is installed, the filter element 42-4 can filter the square wave second power source V2 into a continuous positive half-sine wave second power source V2, and provide the continuous positive half-sine wave second power source V2 to the first input side 24-1 and the inverter unit 44 from the second output side 42-2. The inverter unit 44 converts the continuous positive half-sine wave second power source V2 into a sine wave second output power source Vo2, and provides the second output power source Vo2 to the output end 100-2. Thus, if the second DC conversion unit 42 is equipped with the filter element 42-4, the overall efficiency of the uninterruptible power supply 100 can be improved.

[0073] See also Figure 3B , which is a circuit diagram of the second embodiment of the uninterruptible power supply of the present invention, and is also referred to in conjunction with Figures 2 to 3A . In this embodiment, the uninterruptible power supply 100' is an AC input-DC output type uninterruptible power supply, wherein the switching unit 10' is an AC-DC converter. When there is an input power Vin, the switching unit 10' converts the input power Vin into a first output power Vo1', and provides the first output power Vo1' to the load 200 through the output terminal 100-2. When there is no input power Vin, the switching unit 10' does not work, and the power is provided by the energy storage unit 30 through the conversion unit 40' to provide the second output power Vo2', and is provided to the load 200 through the output terminal 100-2.

[0074] The switching unit 10' includes a second rectifying unit 12 and a third DC conversion unit 14. One end of the second rectifying unit 12 is coupled to the input terminal 100-1, and the other end is coupled to one end of the third DC conversion unit 14, and the other end of the third DC conversion unit 14 is coupled to the output terminal 100-2. When there is an input power supply Vin, the second rectifying unit 12 rectifies the input power supply Vin into a third power supply V3, and the third DC conversion unit 14 converts the third power supply V3 into a first output power supply Vo1', and provides the first output power supply Vo1' to the output terminal 100-2. It is worth mentioning that in one embodiment of the present invention, the type of the third DC conversion unit 14 is not limited, and all DC converters known in the art should be included in the scope of this embodiment.

[0075] The conversion unit 40' includes a second DC conversion unit 42', and the second DC conversion unit 42' includes a second input side 42-1, a second output side 42-2 and a second voltage conversion element 42-3. The second input side 42-1 is coupled to the energy storage unit 30, and the second output side 42-2 (i.e. Figure 1 The third terminal of the conversion unit 40 mentioned above is coupled to the output terminal 100-2 and the first input side 24-1 of the first DC conversion unit 24. The second transformer 42-3 is coupled between the second input side 42-1 and the second output side 42-2, and provides the power of the second input side 42-1 to be coupled to the second output side 42-2 in an electromagnetic coupling manner. When there is no input power Vin, the second DC conversion unit 42' converts the energy storage power Vc into a second power V2, and provides it to the first input side 24-1 through the second output side 42-2. Moreover, the second DC conversion unit 42' uses the second power V2 as the second output power Vo2', and provides the second output power Vo2' to the output terminal 100-2 to provide the power required for the operation of the load 200.

[0076] It is worth mentioning that the charging unit 20 not mentioned in this embodiment has the same circuit structure, connection relationship and control method as Figure 3A In addition, in one embodiment of the present invention, the second DC conversion unit 42' can be a flyback converter, and its circuit structure is the same as Figure 3A The first DC conversion unit 24 of the charging unit 20 has the same power conversion function as the first DC conversion unit 24, but is not limited thereto. In other words, all DC converters known in the art should be included in the scope of this embodiment.

[0077] See also Figure 4 , which is a flow chart of the method for operating the uninterruptible power supply of the present invention, and is also referred to in conjunction with Figures 2 to 3B. The uninterruptible power supply receives an input power supply Vin, and provides a first output power supply Vo1 or a second output power supply Vo2 to a load 200. The operating method of the uninterruptible power supply includes: first, when there is an input power supply, the switching unit provides a first output power supply (S100). When the uninterruptible power supply 100 is an uninterruptible power supply of an AC input-AC output type, and has an input power supply Vin, the switching unit 10 is turned on, so that the input power supply Vin is the first output power supply Vo1, and is provided to the load 200 from the output terminal 100-2. When the uninterruptible power supply 100' is an uninterruptible power supply of an AC input-DC output type, and has an input power supply Vin, the switching unit 10' converts the input power supply Vin into a first output power supply Vo1', and provides the first output power supply Vo1' to the load 200 through the output terminal 100-2.

[0078] Then, when there is an input power supply, the charging unit converts the input power supply into a first power supply, provides the first power supply to the control unit, and charges the energy storage unit (S120). The charging unit 20 includes a first rectifier unit 22 and a first DC conversion unit 24. After the first rectifier unit 22 rectifies the input power supply Vin, the rectified input power supply Vin is provided to the first input side 24-1 of the first DC conversion unit 24. After the first DC conversion unit 24 converts the rectified input power supply Vin into a first power supply V1, the first power supply V1 is output through the first output side 24-2. When there is an input power supply Vin, the first DC conversion unit 24 converts the rectified input power supply Vin into a first power supply V1, and outputs the first power supply V1 through the first output side 24-2. The first power supply V1 is provided to the control unit 50 by the first output side 24-2, and the energy storage unit 30 is charged through the switch unit 60.

[0079] Then, when there is no input power, the conversion unit converts the power of the energy storage unit into the second output power (S140). When the uninterruptible power supply 100 is an uninterruptible power supply of the AC input-AC output type, and there is no input power Vin, the second DC conversion unit 42 converts the energy storage power Vc into the second power V2, and provides it to the first input side 24-1 and the inverter unit 44 through the second output side 42-2. The inverter unit 44 inverts the second power V2 into the second output power Vo2, and provides it to the load 200 through the output terminal 100-2. When the uninterruptible power supply 100' is an uninterruptible power supply of the AC input-DC output type, and there is no input power Vin, the second DC conversion unit 42' converts the energy storage power Vc into the second power V2, and provides it to the first input side 24-1 through the second output side 42-2. Furthermore, the second DC conversion unit 42 ′ uses the second power source V2 as the second output power source Vo2 ′, and provides the second output power source Vo2 ′ to the output terminal 100 - 2 to provide the power required for the operation of the load 200 .

[0080] Finally, when there is no input power, the conversion unit converts the power of the energy storage unit into the second power, and provides the second power to the charging unit; the charging unit converts the second power into the first power, and provides the first power to the control unit (S160). When there is no input power Vin, the first DC conversion unit 24 converts the second power V2 into the first power V1, and outputs the first power V1 through the first output side 24-2. The first power V1 is provided to the control unit 50 by the first output side 24-2.

[0081] In summary, one or more embodiments of the present invention have the following technical features and advantages:

[0082] 1. The main purpose of the present invention is to enable the uninterruptible power supply to share the conversion circuit of the charging unit during operation through the coupling relationship between the first input side of the charging unit and the second output side of the conversion unit, thereby eliminating the circuit of the switching power supply unit coupled between the charging unit and the control unit in the uninterruptible power supply of the prior art, thereby achieving the effect of reducing the cost and size of the uninterruptible power supply;

[0083] 2. The switch unit is turned on when there is input power and turned off when there is no input power. When there is no input power, the energy storage power output by the energy storage unit will not flow back to the energy storage unit through the charging unit, thereby avoiding unnecessary waste of power.

[0084] 3. Since the control unit includes an isolation transformer for electrically isolating the primary side from the secondary side, it can achieve the effect of protecting the user from the power safety of operating the uninterruptible power supply; and

[0085] 4. Since the conversion unit may include a filtering element, the filtering element can filter the square wave second power supply into a continuous half-sine wave second power supply, thereby achieving the effect of improving the overall efficiency of the uninterruptible power supply.

[0086] However, the above description is only a detailed description and drawings of the preferred specific embodiments of the present invention, but the features of the present invention are not limited thereto and are not used to limit the present invention. The entire scope of the present invention shall be based on the protection scope of the claims of this application. All embodiments that are in line with the spirit of the patent application scope of the present invention and similar variations thereof shall be included in the scope of the present invention. Any changes or modifications that can be easily thought of by relevant technical personnel familiar with the art within the field of the present invention shall be covered within the protection scope of the claims attached to the present invention.

Claims

1. An uninterruptible power supply, characterized in that: The uninterruptible power supply comprises an input terminal for receiving an input power source and an output terminal coupled to a load. The uninterruptible power supply comprises: a switching unit, coupling the input end and the output end; a charging unit, coupled to the input terminal; an energy storage unit, coupled to the charging unit; a conversion unit, coupled to the charging unit and the energy storage unit; a control unit, coupled to the charging unit; and a switch unit, coupling the charging unit and the energy storage unit; Wherein, when the input power is present, the switching unit switches the input power to a first output power to the output end, the charging unit converts the input power to a first power, provides the first power to the control unit, and charges the energy storage unit; when the input power is not present, the conversion unit converts the power of the energy storage unit to a second output power, provides the second output power to the output end, and the conversion unit provides a second power to the charging unit, so that the charging unit converts the second power to the first power, and provides the first power to the control unit. When the input power is present, the switch unit is turned on, so that the first power source charges the energy storage unit; when the input power is not present, the switch unit is turned off, so that the first power source does not charge the energy storage unit.

2. The uninterruptible power supply as claimed in claim 1, wherein: The charging unit includes: a first rectifying unit, coupled to the input end; and A first DC conversion unit includes a first input side and a first output side, wherein the first input side is coupled to the first rectifying unit, and the first output side is coupled to the energy storage unit; Wherein, the first rectifying unit and the first DC conversion unit convert the input power into the first power, or the first DC conversion unit converts the second power into the first power; the control unit is coupled to the first output side and the energy storage unit, and the first DC conversion unit provides the first power to the control unit.

3. The uninterruptible power supply as claimed in claim 2, wherein: The conversion unit includes: a second DC conversion unit, comprising a second input side and a second output side, wherein the second input side is coupled to the energy storage unit; and an inverter unit coupled to the second output side and the output end; The second DC conversion unit converts the power of the energy storage unit into the second power supply, and the inverter unit converts the second power supply into the second output power supply; the second output side is coupled to the first input side, so that the second power supply is provided from the second output side to the first input side.

4. The uninterruptible power supply as claimed in claim 3, characterized in that: The second DC conversion unit includes: A filter element is coupled to the second output side and filters the second power supply.

5. The uninterruptible power supply as claimed in claim 2, wherein: The conversion unit includes: A second DC conversion unit includes a second input side and a second output side, the second input side is coupled to the energy storage unit, and the second output side is coupled to the output end; The second DC conversion unit converts the power of the energy storage unit into the second power supply, so that the second power supply is the second output power supply; the second output side is coupled to the first input side, so that the second power supply is provided from the second output side to the first input side.

6. The uninterruptible power supply as claimed in claim 2, wherein: The switching unit comprises: a second rectifying unit, coupled to the input end; and a third DC conversion unit, coupled to the second rectifying unit and the output end; When the input power is present, the second rectifying unit rectifies the input power into a third power, and the third DC conversion unit converts the third power into the first output power.

7. The uninterruptible power supply as claimed in claim 1, wherein: The control unit comprises: an isolation transformer coupled to the charging unit; a communication unit coupled to the isolation transformer; and a controller coupled to the charging unit; The first power source provides power required for the operation of the controller, and provides power required for the operation of the communication unit through the isolation transformer.

8. A method for operating an uninterruptible power supply, characterized in that: The uninterruptible power supply receives an input power source and provides a first output power source or a second output power source to a load. The uninterruptible power supply includes a switching unit, a charging unit, an energy storage unit, a conversion unit and a control unit. The conversion unit is coupled to the charging unit and the energy storage unit. The control unit is coupled to the charging unit. The steps of the operation method include: When the input power is present, the switching unit switches the input power to become the first output power; When the input power is present, the charging unit converts the input power into a first power, provides the first power to the control unit, and charges the energy storage unit; When the input power source is not present, the conversion unit converts the power of the energy storage unit into a second output power source; and When there is no input power, the conversion unit converts the power of the energy storage unit into a second power source and provides the second power source to the charging unit; the charging unit converts the second power source into a first power source and provides the first power source to the control unit. The uninterruptible power supply also includes a switch unit coupling the charging unit and the energy storage unit; when the input power is present, the switch unit is turned on so that the first power source charges the energy storage unit; when the input power is not present, the switch unit is turned off so that the first power source does not charge the energy storage unit.

9. The operating method according to claim 8, characterized in that: The charging unit includes a first rectifying unit and a first DC conversion unit; the first rectifying unit and the first DC conversion unit convert the input power into the first power, or the first DC conversion unit converts the second power into the first power.

10. The operating method according to claim 8, characterized in that: The conversion unit includes a second DC conversion unit and an inverter unit; the second DC conversion unit converts the power of the energy storage unit into the second power source, and the inverter unit converts the second power source into the second output power source.

11. The operating method according to claim 8, characterized in that: The conversion unit includes a second DC conversion unit; the second DC conversion unit converts the power of the energy storage unit into the second power source, so that the second power source is the second output power source.

12. The operating method according to claim 11, characterized in that: The switching unit includes a second rectifying unit and a third DC conversion unit. When the input power is present, the second rectifying unit rectifies the input power into a third power, and the third DC conversion unit converts the third power into the first output power.

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