TWI694326B - Uninterruptible power supply and method of operating the same - Google Patents

Abstract

An uninterruptible power supply includes an input terminal receiving an input power, an output terminal coupled to a load, a switching unit, a charging unit, an energy storage unit, a conversion unit, and a control unit. When the input power is available, the switching unit provides a first output power to the output terminal, the charging unit converts the input power into the first power, and provides the first power to the control unit, and charges the energy storage unit. When the input power is not available, the conversion unit converts a power of the energy storage unit into a second output power, and provides the second output power to the output terminal. When the input power is not available, the conversion unit provides a second power to the charging unit so that the charging unit converts the second power into the first power, and provides the first power to the control unit.

Description

Uninterruptible power supply and its operating method

The invention relates to an uninterruptible power supply and its operating method, in particular to an uninterruptible power supply and its operating method which saves circuit structure.

With the continuous development of science and technology, the requirements for power supply quality of electrical equipment are becoming higher and higher. In order to ensure the safety of electrical equipment, the continuous power supply is highly valued. In addition, in order to meet the needs of use, the circuit architecture of the uninterruptible power supply is gradually developed in the direction of cost saving and volume reduction.

Please refer to FIG. 1, which is a block diagram of a conventional uninterruptible power supply. The conventional uninterruptible power supply 100A 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 the converted input power supply Vin charges the energy storage unit 30A, and at the same time, the switch-mode power supply unit SPS receives the output power supply of the charging unit 20A, and converts the output of the charging unit 20A The power supply is supplied to the control unit 50A. When there is no input power Vin, the switch-mode 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 the control unit 50A.

However, since the power supplied by the energy storage unit 30A to the control unit 50A must be converted by a first-level conversion circuit (referred to herein as a switch-mode power supply unit SPS), it can provide stable and meet the normal operation of the control unit 50A. In addition to the shortcomings that the power supply of the uninterruptible power supply cannot be reduced and the cost of the circuit cannot be reduced, the conversion of the multi-level 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 operation method, using integrated conversion units and special connection relationships to save a first-level conversion circuit, is a major problem that the inventor of the present invention wants to overcome and solve .

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 terminal receiving input power and an output terminal coupled to the load. The uninterruptible power supply includes a switching unit coupled to the input terminal. The charging unit is coupled to the input terminal and the output terminal. The energy storage unit is coupled to the charging unit. The conversion unit is 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 terminal, 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 into a second output power supply, and provides the second output power supply to the output terminal; 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 provides the first power supply to the control unit.

In order to solve the above problems, the present invention provides an operation method of an uninterruptible power supply to overcome the problems of the conventional technology. Therefore, the uninterruptible power supply of the present invention receives input power and provides the first output power or the second output power to the load. The uninterruptible power supply includes a switching unit, a charging unit, an energy storage unit, a conversion unit and The control unit, the steps of the operation method include: (a) When there is an input power supply, the switching unit switches so that the input power supply is the first output power supply. (b) When there is an input power source, the charging unit converts the input power source to the first power source, and provides the first power source 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 into 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 into a second power supply and provides the second power supply to the charging unit; the charging unit converts the second power supply into the first power supply and provides the first power supply To the control unit.

In order to further understand the technology, means and effects of the present invention to achieve the intended purpose, please refer to the following detailed description and drawings of the present invention. I believe the purpose, features and characteristics of the present invention can be obtained in depth and For specific understanding, the accompanying drawings are provided for reference and explanation only, and are not intended to limit the present invention.

〔current technology〕

100A: Uninterruptible power supply

10A: Switching unit

20A: Charging unit

30A: Energy storage unit

40A: Conversion unit

SPS: Switching power supply unit

50A: control unit

〔this invention〕

100, 100’: Uninterruptible power supply

100-1: input

100-2: output

10, 10’: Switching unit

12: Second rectifier unit

14: Third DC conversion unit

20: Charging unit

22: The first rectifier unit

24: The first DC conversion unit

24-1: First input side

24-2: first output side

24-3: the first transformer element

30: Energy storage unit

40, 40’: Conversion unit

42, 42’: Second DC conversion unit

42-1: Second input side

42-2: Second output side

42-3: Second transformer element

42-4: filter element

44: Inverter unit

50: control unit

52: Isolation transformer

54: Communication unit

56: controller

60: switch unit

D1: Diode

200: load

Vin: input power

Vo1, Vo1’: the first output power

Vo2, Vo2’: Second output power

V1: the first power supply

V2: second power supply

V3: third power supply

Vc: energy storage power supply

(S100)~(S160): Steps

1 is a block diagram of a conventional uninterruptible power supply; FIG. 2 is a block diagram of the uninterruptible power supply of the present invention; FIG. 3A is a circuit diagram of a first embodiment of the uninterruptible power supply of the present invention; 3B is a circuit diagram of a second embodiment of the uninterruptible power supply of the present invention; and FIG. 4 is a flowchart of an operation method of the uninterruptible power supply of the present invention.

The technical content and detailed description of the present invention are described below in conjunction with the drawings: Please refer to FIG. 2, which is a block diagram of the 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 the input power Vin and the output terminal 100-2 is coupled to the load 200. Uninterruptible power supply 100 includes switching unit 10, charging Unit 20, energy storage unit 30, conversion unit 40 and 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. The first end of the conversion unit 40 is coupled to the output end 100-2, and the second end is coupled to the energy storage unit 30. In addition, the third terminal of the conversion unit 40 is coupled to the charging unit 20 and provides a second power source V2 to the charging unit 20. The specific position of the conversion unit 40 coupled to the charging unit 20 and the timing of providing the second power supply V2 will be described in more detail below.

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 a load 200 electricity required for operation. At this time, the charging unit 20 receives the input power Vin, converts the input power Vin to the first power V1, and outputs the first power V1 to charge the energy storage unit 30. At the same time, the first power source V1 output by the charging unit 20 is also provided to the control unit 50 to provide power required for the control unit 50 to operate.

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

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

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 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 a place for the communication unit 54 to operate. Electricity required. The controller 56 is coupled to the charging unit 20, and the first power source V1 provides power required for the controller 56 to operate. Further, the communication unit 54 is usually disposed outside the uninterruptible power supply 100 (eg, but not limited to, the surface of the housing of the uninterruptible power supply 100), and the isolation transformer 52 is used as the primary side of the isolation transformer 52 It is electrically isolated from the secondary side to protect the safety of the user operating the uninterruptible power supply 100. The controller 56 is usually disposed inside the uninterruptible power supply 100 and outputs a control signal to maintain the normal operation of the units of the uninterruptible power supply 100. Therefore, under normal operation, the controller 56 is generally not touched by the user, and an isolation transformer can be omitted. However, in practical applications, it can be set according to the actual use requirements of the uninterruptible power supply 100.

Further, when the power in the energy storage unit 30 continues to be consumed, the voltage value of the energy storage power source Vc gradually decreases due to the continuous consumption of the power in the energy storage unit 30. If the energy storage unit 30 directly supplies the energy storage power source Vc to the control unit 50, it may cause the voltage value of the energy storage power source Vc to drop to the point that the control unit 50 cannot be maintained to work normally. Therefore, the energy storage power supply Vc must pass through the primary conversion unit (in one embodiment of the present invention, referring to the charging unit 20) to maintain the power received by the control unit 50 (in one embodiment of the present invention, referring to The voltage value of the first power supply V1) is stable.

Please refer to FIG. 3A, which is a circuit diagram of the first embodiment of the uninterruptible power supply of the present invention. In this embodiment, the uninterruptible power supply 100 is an AC input-AC output An uninterruptible power supply of the type, in which the switching unit 10 is a switching element. When the input power Vin is present, the switching unit 10 is turned on, so that the input power Vin is the first output power Vo1 and is provided to the load 200 from the output terminal 100-2. When there is no input power 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 Vo2, and is supplied to the load 200 through the output terminal 100-2. Therefore, regardless of whether there is input power Vin, the load 200 can obtain the required power supply.

The charging unit 20 includes a first rectification unit 22 and a first DC conversion unit 24. One end of the first rectifier unit 22 is coupled to the input terminal 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 transformer element 24-3. The first input side 24-1 is coupled to the first rectifier unit 22 and the conversion unit 40, and the first output side 24-2 is coupled to the control unit 50 and to the energy storage unit 30 through the switch unit 60. The first transforming element 24-3 is coupled between the first input side 24-1 and the first output side 24-2, and provides power to the first input side 24-1 in an electromagnetic coupling manner, and is coupled to the first output Side 24-2. 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 as a large power supply to convert to a small power supply (such as but not limited to, 180V to 12V ), and use the first transformer element 24-3 to provide electrical isolation of large power and small power, but not limited to this. In other words, all DC converters known in the art should be included in the scope of this embodiment.

After the first rectification unit 22 rectifies the input power Vin, the rectified input power Vin is supplied to the first input side 24-1 of the first DC conversion unit 24. The first DC conversion unit 24 converts the rectified input power supply Vin into the first power supply V1, and then outputs the first power supply V1 through the first output side 24-2. Alternatively, the first DC conversion unit 24 converts the power provided by the energy storage unit 30 into the first power supply V1 via the second power supply V2 provided by the conversion unit 40, and then outputs the first power supply V1 through the first output side 24-2.

When there is input power Vin, the switching unit 60 is turned on. The first DC conversion unit 24 converts the rectified input power Vin to the first power V1, and then outputs the first A power supply V1. The first power source V1 is supplied to the control unit 50 from the first output side 24-2, and charges the energy storage unit 30 through the switch unit 60.

When there is no input power Vin, the switch unit 60 is turned off to make the path from the first output side 24-2 to the energy storage unit 30 open. After converting the second power source V2 into the first power source V1, the first DC conversion unit 24 outputs the first power source V1 through the first output side 24-2. The first power source V1 is provided to the control unit 50 from the first output side 24-2, but the energy storage unit 30 cannot be charged.

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 transformer element 42-3. The second input side 42-1 is coupled to the energy storage unit 30, and the second output side 42-2 (meaning the third end of the conversion unit 40 mentioned in FIG. 1) is coupled to one end of the inverter unit 44 and the first straight The first input side 24-1 of the flow conversion unit 24 and the other end of the inverter unit 44 are coupled to the output end 100-2. The second voltage transformation element 42-3 is coupled between the second input side 42-1 and the second output side 42-2, and provides power to the second input side 42-1 in an electromagnetic coupling manner, and is coupled to the second output Side 42-2.

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 supplies it to the first input side 24-1 through the second output side 42-2 With inverter unit 44. The inverter unit 44 inverts and converts the second power source V2 into a second output power source Vo2, and provides it to the load 200 through the output terminal 100-2. It is worth mentioning that in an embodiment of the present invention, a diode D1 may be installed between the second output side 42-2 and the first input side 24-1 to avoid the power return of the first input side 24-1 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 (Push-pull converter), which is mainly used as a small power supply to convert to a large power supply (such as but not limited to, 12V to 180V), and use the second transformer element 42-3 to provide electrical isolation of small power and large power, but not limited to this. In other words, all DC converters known in the art should be included in the scope of this embodiment.

The second DC conversion unit 42 may include a filter element 42-4 (indicated by a dashed frame, such as but not limited to an inductor), and the filter element 42-4 is coupled to the second transformer element 42-3 and the second output side 42-2 And filter the second power supply V2. Specifically, when the filter element 42-4 is not installed, the second DC conversion unit 42 converts the DC energy storage power supply Vc into a square wave second power supply V2, and the second output side 42-2 converts the square wave The second power supply V2 is provided to the first input side 24-1 and the inverter unit 44. The inverter unit 44 converts the second power source V2 of the square wave into a second output power source Vo2 of the positive and negative square wave (similar to a sine wave), and provides the second output power source Vo2 to the output terminal 100-2. When the filter element 42-4 is added, the filter element 42-4 can filter the second power supply V2 of the square wave into the second power supply V2 of the continuous sinusoidal wave, and the continuous positive The half-sine wave second power supply V2 is supplied to the first input side 24-1 and the inverter unit 44. The inverter unit 44 converts the continuous sine wave second power supply V2 into a sine wave second output power supply Vo2, and provides the second output power supply Vo2 to the output terminal 100-2. In this way, if the second DC conversion unit 42 is equipped with the filter element 42-4, the effect of improving the overall efficiency of the uninterruptible power supply 100 can be achieved.

Please refer to FIG. 3B, which is a circuit diagram of the second embodiment of the uninterruptible power supply of the present invention. 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 having the input power Vin, the switching unit 10' converts the input power Vin to the first output power Vo1', and supplies 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 supplied to the load 200 through the output terminal 100-2.

The switching unit 10' includes a second rectification unit 12 and a third DC conversion unit 14. One end of the second rectification unit 12 is coupled to the input end 100-1, 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 end 100-2. When there is an input power supply Vin, the second rectification 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 the 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 any DC converter known in the art should be included in the scope of this embodiment.

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 transformer element 42-3. The second input side 42-1 is coupled to the energy storage unit 30, and the second output side 42-2 (meaning the third terminal of the conversion unit 40 mentioned in FIG. 1) is coupled to the output terminal 100-2 and the first DC The first input side 24-1 of the conversion unit 24. The second voltage transformation element 42-3 is coupled between the second input side 42-1 and the second output side 42-2, and provides power to the second input side 42-1 in an electromagnetic coupling manner, and is coupled to the second output Side 42-2. When there is no input power source Vin, the second DC conversion unit 42' converts the stored power source Vc to the second power source V2 and supplies 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 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.

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 FIG. 3A. In addition, in an embodiment of the present invention, the second DC conversion unit 42' may be a flyback converter, and its circuit structure is the same as the first DC conversion unit 24 of the charging unit 20 of FIG. 3A, so The power conversion function is the same as the conversion function of the first DC conversion unit 24, but it is not limited thereto. In other words, all DC converters known in the art should be included in the scope of this embodiment.

Please refer to FIG. 4, which is a flowchart of the operation method of the uninterruptible power supply of the present invention. Refer to FIGS. 2 to 3B for further details. The uninterruptible power supply receives the input power Vin and provides the first output power Vo1 or the second output power Vo2 to the load 200. The operation method of the uninterruptible power supply includes: first, when there is input power, the switching unit provides the first output power (S100). When the uninterruptible power supply 100 is an AC input-AC output type uninterruptible power supply and has an input power Vin, the switching unit 10 is turned on so that the input power Vin is the first output power Vo1, and the output The terminal 100-2 is provided to the load 200. When the uninterruptible power supply 100' is an AC input-DC output type uninterruptible power supply When the device has an input power source Vin, the switching unit 10' converts the input power source Vin into a first output power source Vo1', and provides the first output power source Vo1' to the load 200 through the output terminal 100-2.

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

Then, when there is no input power supply, the conversion unit converts the power of the energy storage unit into the second output power supply (S140). When the uninterruptible power supply 100 is an AC input-AC output type uninterruptible power supply and there is no input power Vin, the second DC conversion unit 42 converts the energy storage power supply Vc to the second power supply V2, and It is supplied to the first input side 24-1 and the inverter unit 44 through the second output side 42-2. The inverter unit 44 inverts and converts the second power source V2 into a second output power source Vo2, and provides it to the load 200 through the output terminal 100-2. When the uninterruptible power supply 100' is an AC input-DC output type uninterruptible power supply and there is no input power Vin, the second DC conversion unit 42' converts the energy storage power Vc to the second power V2 And provided 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 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.

Finally, when there is no input power supply, the conversion unit converts the power of the energy storage unit into the second power supply and provides the second power supply to the charging unit; the charging unit converts the second power supply into the first power supply and provides the first power supply to the control Unit (S160). When there is no input power Vin, the first DC conversion unit 24 After converting the second power source V2 to the first power source V1, the first power source V1 is output through the first output side 24-2. The first power source V1 is supplied to the control unit 50 from the first output side 24-2.

In summary, one or more embodiments of the present invention have the following technical features and advantages: 1. The main purpose of the present invention is to couple the first input side of the charging unit and the second output side of the conversion unit The relationship allows the switching power supply of the uninterruptible power supply to share the conversion circuit of the charging unit during operation, so that the switching power supply coupled between the charging unit and the control unit in the prior art uninterruptible power supply can be omitted The circuit of the supply unit, thereby achieving the effect of reducing the cost of the uninterruptible power supply and reducing the volume of the uninterruptible power supply; 2. The switch unit is turned on when there is input power and turned off when there is no input power , So that when there is no input power, the energy storage power output by the energy storage unit will not return to the energy storage unit through the charging unit, so it can achieve the effect of avoiding unnecessary waste of power; 3. Since the control unit includes a primary side and two Isolation transformer with electrical isolation on the secondary side, so it can achieve the effect of protecting the safety of the user's operation of the uninterruptible power supply; and 4. Since the conversion unit can include a filter element, the filter element can use the second power of the square wave The second power source filtered into a continuous sinusoidal wave can therefore achieve the effect of improving the overall efficiency of the uninterruptible power supply.

However, the above is only a detailed description and drawings of preferred specific embodiments of the present invention, but the features of the present invention are not limited thereto, and are not intended to limit the present invention. All scope of the present invention should be applied as follows The scope of the patent shall prevail, and all the embodiments which conform to the spirit of the present invention and similar changes shall be included in the scope of the present invention, and anyone who is familiar with this skill in the field of the present invention can easily think about it Changes or modifications can be covered in the patent scope of the following case.

100: Uninterruptible power supply

100-1: input

100-2: output

10: Switching unit

20: Charging unit

30: Energy storage unit

40: Conversion unit

50: control unit

52: Isolation transformer

54: Communication unit

56: controller

60: switch unit

200: load

Vin: input power

Vo1: the first output power

Vo2: second output power

V1: the first power supply

V2: second power supply

Vc: energy storage power supply

Claims (12)

An uninterruptible power supply includes an input terminal that receives an input power and an output terminal coupled to a load. The uninterruptible power supply includes: a switching unit coupled to the input terminal and the output terminal A charging unit coupled to the input terminal; an energy storage unit coupled to the charging unit; a switch unit coupling the charging unit and the energy storage unit; a conversion unit coupling the charging unit and the energy storage A unit; and a control unit coupled to the charging unit; wherein, when the input power is present, the switching unit switches the input power to a first output power to the output, and the charging unit converts the input power to a A first power source, and providing the first power source to the control unit and charging 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 source, and The second output power supply is provided to the output terminal, and the conversion unit provides a 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 ; When the input power is present, the switch unit is turned on, so that the first power supply charges the energy storage unit; when the input power is not present, the switch unit is turned off, so that the first power supply does not charge the energy storage unit . The uninterruptible power supply as described in item 1 of the patent application scope, wherein the charging unit includes: a first rectification unit coupled to the input terminal; and a first DC conversion unit including a first input side And a first output side, the first input side is coupled to the first rectifier unit, and the first output side is coupled to the energy storage unit; Wherein, the first rectification unit and the first DC conversion unit convert the input power to the first power, or the first DC conversion unit converts the second power to the first power; the control unit is coupled The first output side is connected to the energy storage unit, and the first DC conversion unit provides the first power supply to the control unit. The uninterruptible power supply as described in item 2 of the patent application scope, wherein the conversion unit includes: a second DC conversion unit including a second input side and a second output side, the second input side being coupled The energy storage unit; and an inverter unit coupled to the second output side and the output terminal; wherein, the second DC conversion unit converts the power of the energy storage unit to the second power source, and the inverter unit Converting the second power supply to 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. The uninterruptible power supply as recited in item 3 of the patent application scope, wherein the second DC conversion unit includes: a filter element coupled to the second output side and filtering the second power supply. The uninterruptible power supply as described in item 2 of the patent application scope, wherein the conversion unit includes: a second DC conversion unit including a second input side and a second output side, the second input side being coupled The energy storage unit, and the second output side is coupled to the output terminal; wherein, the second DC conversion unit converts the power of the energy storage unit to the second power source, so that the second power source 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. The uninterruptible power supply as described in item 2 of the patent application scope, wherein the switching unit includes: A second rectifier unit coupled to the input terminal; and a third DC converter unit coupled to the second rectifier unit and the output terminal; wherein, when the input power is present, the second rectifier unit connects the input power Rectified into a third power source, and the third DC conversion unit converts the third power source into the first output power source. The uninterruptible power supply as described in item 1 of the patent application scope, wherein the control unit includes: an isolation transformer coupled to the charging unit; a communication unit coupled to the isolation transformer; and a controller coupled The charging unit; wherein, the first power supply provides power required for the operation of the controller, and provides power required for operation of the communication unit through the isolation transformer. An operation method of an uninterruptible power supply. The uninterruptible power supply receives an input power and provides a first output power or a second output power to a load. The uninterruptible power supply includes a switch Unit, a charging unit, an energy storage unit, a switch unit, a conversion unit and a control unit, the steps of the operation method include: when the input power is present, the switching unit switches the input power to the first output Power supply; when the input power supply is present, the charging unit converts the input power supply into a first power supply, and provides the first power supply to the control unit, and charges the energy storage unit; when the input power supply is not present, the The conversion unit converts the power of the energy storage unit into the second output power source; 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 second power source A charging unit; the charging unit converts the second power source to a first power source, and provides the first power source to the control unit; and When there is the input power supply, the switch unit is turned on, so that the first power supply charges the energy storage unit; when there is no input power, the switch unit is turned off, so that the first power supply does not charge the energy storage unit. The operation method as described in item 8 of the patent application scope, wherein the charging unit includes a first rectification unit and a first DC conversion unit; the first rectification unit and the first DC conversion unit convert the input power Is the first power source, or the first DC conversion unit converts the second power source to the first power source. The operation method as described in item 8 of the patent application scope, wherein 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. The operation method as described in item 8 of the patent application scope, wherein 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 This is the second output power supply. The operation method as described in item 11 of the patent application scope, wherein the switching unit includes a second rectification unit and a third DC conversion unit; when having the input power supply, the second rectification unit rectifies the input power supply into a A third power source, and the third DC conversion unit converts the third power source into the first output power source.

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