TWI704747B - Uninterruptible power system - Google Patents

Abstract

An uninterruptible power system is provided for uninterruptedly supplying power to a load. The uninterrupted power system includes a first circuit, a second circuit, and a third circuit. The first circuit is coupled to a live line end. The second circuit is coupled to the live line end, the first circuit, and a neutral line end. The third circuit is coupled to the first circuit, the second circuit, and the neutral line end. The first circuit includes a first power switch circuit and a backup battery. The second circuit includes an energy storage unit, a second power switch circuit and a third power switch circuit coupled to each other. The third circuit is coupled to the first power switch circuit, the second power switch circuit, the third power switch circuit, and the neutral line end.

Description

Uninterruptible power system

The present invention relates to an uninterrupted power system, in particular to an uninterrupted power system applied to provide a commercial power mode or a battery mode to a load.

Generally speaking, when a converter with Power Factor Correction (PFC) function is used in the battery mode of the current 3kVA architecture of the Uninterruptible Power System (UPS), in the event of an abnormal power grid or power failure A device that continuously provides backup AC power supply to load equipment such as electrical appliances to maintain the normal operation of electrical appliances. Under normal circumstances, the uninterrupted power system is used to maintain uninterrupted power supply for key commercial equipment or precision instruments such as computers and servers to prevent data loss, communication interruption, or loss of control of the device.

However, when the current uninterruptible power system (UPS) operates in battery mode under the 3kVA architecture, the traditional DC-to-DC converter is a Push-Pull architecture, which is different from the AC grid Boost boost circuit at one end. As a result, it will occupy too much wiring area on the circuit board, increase the circuit board base material and process time, and increase the volume and cost of the uninterruptible power system.

Therefore, how to design an improved uninterruptible power system, especially the improvement of the simplified circuit structure, to solve the aforementioned technical problems of the increase in the volume and cost of the uninterruptible power system is an important subject studied by the inventors of this case. .

The purpose of the present invention is to provide an uninterruptible power system, which can solve the aforementioned technical problems of the increase in volume and cost of the uninterrupted power system through simplified improvements in the circuit architecture, thereby reducing production costs, improving production efficiency, and being portable. purpose.

In order to achieve the foregoing objective, the uninterrupted power system proposed by the present invention is applied to provide uninterrupted power supply in commercial power mode or battery mode to a load. The uninterrupted power system includes: a first circuit, a second circuit, and a third circuit; , The first circuit is coupled to the live terminal of the AC power source, the first circuit includes a first power switch circuit and a backup battery, the first power switch circuit is coupled to the backup battery, and the backup battery is coupled to the live terminal; the second circuit is coupled Connected to the live terminal, the first circuit, and the neutral terminal of the AC power source. The second circuit includes an energy storage unit, a second power switch circuit, and a third power switch circuit coupled to each other. The energy storage unit is coupled to the live terminal and a backup The battery, the second power switch circuit, and the third power switch circuit are all coupled to the energy storage unit and the neutral terminal. The third power switch circuit is coupled to the first power switch circuit; the third circuit is coupled to the first power switch circuit and the second power switch circuit. The second power switch circuit, the third power switch circuit and the neutral terminal; among them, when the AC power supply is normal, the AC power supply provides power supply in the commercial mode to the load through the second circuit and the third circuit; when the AC power supply is abnormal, backup The battery provides battery mode power supply to the load through the first power switch circuit, the second circuit and the third circuit.

Furthermore, in the uninterruptible power system, the first circuit further includes a first diode, and the first power switch circuit includes a first transistor switch; wherein, the backup battery is coupled through the first diode The live wire terminal and the energy storage unit, the cathode of the first diode is coupled to the live wire terminal and the energy storage unit, the first transistor switch is coupled to the third power switch circuit and the third circuit, and the backup battery is coupled to the first second Between the anode of the pole body and the first transistor switch.

Furthermore, in the uninterruptible power system, the second power switch circuit includes a second diode and a second transistor switch coupled in series; wherein, the anode of the second diode is coupled to the energy storage unit and In the third power switch circuit, the cathode of the second diode is coupled to the second transistor switch and the third circuit; the second transistor switch is coupled to the third power switch circuit, the third circuit and the neutral terminal.

Further, in the uninterruptible power system, the third power switch circuit includes a third diode and a third transistor switch coupled in series; wherein, the cathode of the third diode is coupled to the energy storage unit, The anode of the second diode, the anode of the third diode is coupled to the first transistor switch, the third transistor switch, and the third circuit; the third transistor switch is coupled to the second transistor switch and the first transistor Switch, third circuit and neutral terminal.

Furthermore, in the uninterruptible power system, the third circuit includes a fourth diode, a first capacitor, a second capacitor, and a fifth diode coupled in series; wherein, the anode of the fourth diode Coupled to the cathode of the second diode and the second transistor switch, the cathode of the fourth diode is coupled to the first capacitor; the first capacitor is coupled to the second transistor switch, the third transistor switch, the second capacitor, and The neutral terminal; the second capacitor is coupled to the second transistor switch, the third transistor switch, the anode of the fifth diode and the neutral terminal, and the cathode of the fifth diode is coupled to the third diode The anode, the third transistor switch and the first transistor switch.

Furthermore, in the uninterruptible power system, when operating in the mains mode and the system is operating in a positive half cycle: the first transistor switch is turned off, the second transistor switch is turned on, and the third transistor switch is turned off When the energy storage unit is turned off, the energy storage unit is in an energy storage operation; and the first transistor switch is turned off, the second transistor switch is turned off, and the third transistor switch is turned off, and the energy storage unit is in an energy release operation.

Furthermore, in the uninterruptible power system, when the energy storage unit is in energy storage operation, the live terminal, the energy storage unit, the second diode, the second transistor switch and the neutral terminal form the first storage Energy path; and when the energy storage unit is in an energy release operation, the live wire end, the energy storage unit, the second diode, the fourth diode, the first capacitor, and the neutral wire end form a first energy release path.

Furthermore, in the uninterrupted power system, when operating in the mains mode and the system is operating in a negative half cycle: the first transistor switch is off, the second transistor switch is off, and the third transistor switch When turned on, the energy storage unit is an energy storage operation; and the first transistor switch is turned off, the second transistor switch is turned off, and the third transistor switch is turned off, and the energy storage unit is an energy release operation.

Furthermore, in the uninterruptible power system, when the energy storage unit is in energy storage operation, the neutral terminal, the third transistor switch, the third diode, the energy storage unit, and the live terminal form the second storage Energy path; and when the energy storage unit is in an energy release operation, the neutral terminal, the second capacitor, the fifth diode, the third diode, the energy storage unit, and the live terminal form a second energy release path.

Furthermore, in the uninterruptible power system, when operating in battery mode and the system is operating in a positive half cycle: the first transistor switch is turned on, the second transistor switch is turned on, and the third transistor switch is turned on, The energy storage unit is an energy storage operation; and the first transistor switch is turned on, the second transistor switch is turned off, and the third transistor switch is turned on, and the energy storage unit is an energy release operation.

Furthermore, in the uninterruptible power system, when the energy storage unit is in energy storage operation, the positive electrode of the backup battery, the first diode, the energy storage unit, the second diode, and the second transistor switch , The third transistor switch, the first transistor switch, and the negative electrode of the backup battery form a third energy storage path; and when the energy storage unit is operated for discharging, the positive electrode, first diode, and energy storage of the backup battery The cell, the second diode, the fourth diode, the first capacitor, the third transistor switch, the first transistor switch and the negative electrode of the backup battery form a third energy release path.

Furthermore, in the uninterruptible power system, when operating in battery mode and when the system is operating in a negative half cycle: the first transistor switch is turned on, the second transistor switch is turned on, and the third transistor switch is turned on, The energy storage unit is an energy storage operation; and the first transistor switch is turned on, the second transistor switch is turned on, and the third transistor switch is turned off, and the energy storage unit is an energy release operation.

Furthermore, in the uninterruptible power system, when the energy storage unit is in energy storage operation, the positive electrode of the backup battery, the first diode, the energy storage unit, the second diode, and the second transistor switch , The third transistor switch, the first transistor switch, and the negative electrode of the backup battery form a fourth energy storage path; and when the energy storage unit is operated for discharging, the positive electrode, first diode, and energy storage of the backup battery The unit, the second diode, the second transistor switch, the second capacitor, the fifth diode, the first transistor switch, and the negative electrode of the backup battery form a fourth energy release path.

Furthermore, in the aforementioned uninterruptible power system, the energy storage unit is an inductor, and the backup battery is a lithium battery or a lead-acid battery.

When using the uninterrupted power system of the present invention, if the AC power supply is normal, the AC power supply provides power supply in the commercial mode to the load through the second circuit and the third circuit, wherein the second circuit and the third circuit can perform the AC power supply The voltage conversion process (for example: Boost boost) is then provided to the load; if the AC power supply is abnormal (for example: surge, undervoltage or power failure), the first power switch circuit of the first circuit and the second power switch circuit of the second circuit The power switch circuit and the third power switch circuit can control the on and off of the circuit, so that the electric energy output by the backup battery can enter the second circuit through the first power switch circuit and the third circuit for voltage conversion processing, so that the backup battery passes through the second circuit. A power switch circuit, a second circuit and a third circuit provide battery mode power supply to the load.

For this reason, when the AC power supply is abnormal, only the first power switch circuit can make the backup battery perform voltage conversion processing through the second circuit and the third circuit, without the need for additional independent of the AC power flow path. For other voltage conversion circuits (such as Push-Pull converters), the present invention simplifies the improvement of the circuit structure, does not need to occupy additional circuit board volume and wiring area, can reduce the circuit board substrate and process time, and solve the problem of uninterrupted power The volume and cost of the system increase the technical problems, and achieve the purpose of reducing production costs, improving production efficiency and portable use.

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

10: The first circuit

11: The first power switch circuit

12: Backup battery

20: second circuit

21: Energy storage unit

22: The second power switch circuit

23: The third power switch circuit

30: third circuit

D1: The first diode

D2: The second diode

D3: The third diode

D4: The fourth diode

D5: Fifth diode

Q1: The first transistor switch

Q2: The second transistor switch

Q3: The third transistor switch

200: load

300: Input filter circuit

400: inverter

500: output filter circuit

C1: The first capacitor

C2: second capacitor

L: live end

N: Neutral terminal

Lns1: first energy storage path

Lns2: second energy storage path

Lns3: third energy storage path

Lns4: fourth energy storage path

Lnr1: The first energy release path

Lnr2: second energy release path

Lnr3: The third energy release path

Lnr4: The fourth path of discharging energy

B1: Backup battery

L1: Inductor

FIG. 1 is a schematic diagram of the structure of an embodiment of the uninterruptible power system according to the present invention configured in the uninterrupted power system; FIG. 2 is a circuit diagram of the embodiment of the uninterruptible power system according to the present invention; The embodiment of the uninterruptible power system is a schematic diagram of the first energy storage path when the embodiment of the uninterrupted power system operates in the mains mode and is operating in a positive half cycle; FIG. 4 is the embodiment of the uninterrupted power system of the present invention operating in the mains mode and is in the positive half cycle A schematic diagram of the first energy release path during operation; FIG. 5 is a schematic diagram of the second energy storage path when the embodiment of the uninterruptible power system of the present invention operates in the mains mode and operates in a negative half cycle; 6 is a schematic diagram of the second energy release path when the embodiment of the uninterrupted power system of the present invention is operating in the mains mode and the negative half cycle is operated; FIG. 7 is the embodiment of the uninterrupted power system of the present invention operating in The schematic diagram of the third energy storage path in battery mode and the positive half-cycle operation; FIG. 8 is a schematic diagram of the third energy-discharging path when the embodiment of the uninterruptible power system of the present invention operates in the battery mode and the positive half-cycle operation; 9 is a schematic diagram of the fourth energy storage path when the embodiment of the uninterrupted power system of the present invention operates in battery mode and a negative half cycle operation; and FIG. 10 is the embodiment of the uninterrupted power system of the present invention operating in The schematic diagram of the fourth energy release path in battery mode and negative half cycle operation.

The following is a specific embodiment to illustrate the implementation of the present invention. Those skilled in the art can easily understand the other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied by other different specific examples, and various details in the specification of the present invention can also be modified and changed based on different viewpoints and applications without departing from the spirit of the present invention.

It should be noted that the structure, ratio, size, number of components, etc. shown in the accompanying drawings in this specification are only used to match the content disclosed in the specification for the understanding and reading of those familiar with this technology, and are not intended to limit the scope of the present invention. The limited conditions of implementation do not have any technical significance. Any modification of the structure, change of the proportional relationship or adjustment of the size does not affect the production of the present invention. The health effects and the goals that can be achieved should fall within the scope of the technical content disclosed in the present invention.

The technical content and detailed description of the present invention are described below with the drawings.

Please refer to Figures 1 and 2, where Figure 1 is a schematic diagram of an embodiment of the uninterruptible power system of the present invention configured in the uninterrupted power system; Figure 2 is a schematic diagram of the uninterrupted power system of the present invention Circuit diagram of this embodiment. An embodiment of the uninterrupted power system of the present invention is applied to provide uninterrupted power supply in a commercial power mode or a battery mode to the load 200. The uninterrupted power system includes a first circuit 10, a second circuit 20, and a third circuit 30.

Wherein, the first circuit 10 is coupled to the live terminal L of the AC power source. The first circuit 10 includes a first power switch circuit 11 and a backup battery 12 (the element marked B1 in the figure, in this embodiment may be a lithium battery or a lead-acid battery, but the invention is not limited by this); A power switch circuit 11 is coupled to the backup battery 12, and the backup battery 12 is coupled to the live terminal L through the first diode D1. In detail, the first power switch circuit 11 includes a first transistor switch Q1. The cathode of the first diode D1 is coupled to the live terminal L and the energy storage unit 21 (in this embodiment, the inductor L1) of the second circuit 20, and the first transistor switch Q1 is coupled to the third power switch circuit 23 and The third circuit 30 and the backup battery 12 are coupled between the anode of the first diode D1 and the first transistor switch Q1.

The second circuit 20 is coupled to the live terminal L of the AC power supply, the first circuit 10 and the neutral terminal N of the AC power supply. The second circuit 20 includes an energy storage unit 21 (in this embodiment, an inductor L1), a second power switch circuit 22, and a third power switch circuit 23 coupled to each other. The energy storage unit 21 is coupled to the live terminal L and the first diode D1, and the energy storage unit 21 is coupled to the backup battery 12 through the first diode D1. The second power switch circuit 22 and the third power switch circuit 23 Both are coupled to the energy storage unit 21 and the neutral terminal N. The third power switch circuit 23 is coupled to the first power switch circuit 11. In detail, the second power switch circuit 22 includes a second diode D2 and a second transistor switch Q2 coupled in series. The anode of the second diode D2 is coupled to the energy storage unit 21 and the third power switch circuit 23, and the cathode of the second diode D2 is coupled to the second transistor switch Q2 and the third circuit 30; the second transistor The switch Q2 is coupled to the third power switch circuit 23, the third circuit 30 and the neutral terminal N. The third power switch circuit 23 includes a third diode D3 and a third transistor switch Q3 coupled in series. The cathode of the third diode D3 is coupled to the energy storage unit 21, the anode of the second diode D2, and the anode of the third diode D3 is coupled to the first transistor switch Q1, the third transistor switch Q3, and The third circuit 30. The third transistor switch Q3 is coupled to the second transistor switch Q2, the first transistor switch Q1, the third circuit 30 and the neutral terminal N.

The third circuit 30 is coupled to the first power switch circuit 11, the second power switch circuit 22, the third power switch circuit 23 and the neutral terminal N. In detail, the third circuit 30 includes a fourth diode D4, a first capacitor C1, a second capacitor C2, and a fifth diode D5 coupled in series. Wherein, the anode of the fourth diode D4 is coupled to the cathode of the second diode D2 and the second transistor switch Q2, and the cathode of the fourth diode D4 is coupled to the first capacitor C1. The first capacitor C1 is coupled to the second transistor switch Q2, the third transistor switch Q3, the second capacitor C2 and the neutral terminal N. The second capacitor C2 is coupled to the second transistor switch Q2, the third transistor switch Q3, the anode of the fifth diode D5, and the neutral terminal N. The cathode of the fifth diode D5 is coupled to the anode of the third diode D3, the third transistor switch Q3, and the first transistor switch Q1.

Incidentally, the aforementioned transistor switches can be, for example, but not limited to, metal oxide semiconductor field effect transistors (MOSFET), bipolar junction transistors (BJT) or insulated gate bipolar transistors (IGBT) .

In the described embodiment of the present invention, the uninterrupted power system is coupled to the input filter circuit 300, wherein the input filter circuit 300 can be an EMI filter circuit to filter out electromagnetic interference from the input AC power supply (Electromagnetic Interference). , EMI) and other noise (as shown in FIG. 1), and the uninterrupted power system converts the DC power output from the uninterrupted power system into AC power by coupling the inverter 400, and through the coupling The output filter circuit 500, wherein the output filter circuit 500 may be an EMI filter circuit, used to filter out noise such as electromagnetic interference output to the load 200. Wherein, when the AC power source is normal, the AC power source supplies power to the load 200 in the commercial mode through the second circuit 20 and the third circuit 30; when the AC power source is abnormal, the backup battery B1 passes through the first power switch circuit 11 and the second circuit 20 and the third circuit 30 provide battery mode power supply to the load 200.

Please refer to FIG. 3 and FIG. 4. FIG. 3 is a schematic diagram of the first energy storage path when the embodiment of the uninterruptible power system of the present invention operates in the mains mode and is operating in a positive half cycle; FIG. 4 is the first energy storage path of the present invention. The schematic diagram of the first energy-releasing path when this embodiment of the uninterruptible power system is operating in the mains mode and operating in a positive half cycle. When the uninterrupted power system is operating in the mains mode (when the AC power supply is normal), and when the uninterrupted power system is in positive half-cycle operation: as shown in Figure 3, by controlling the first transistor switch Q1 to turn off, The second transistor switch Q2 is turned on, and the third transistor switch Q3 is turned off. At this time, the energy storage unit 21 (ie, the inductor L1) is an energy-storing operation. When the energy storage unit 21 is in an energy storage operation, the live terminal L, the energy storage unit 21, the second diode D2, the second transistor switch Q2, and the neutral terminal N form a first energy storage path Lns1.

As shown in FIG. 4, the first transistor switch Q1 is turned off, the second transistor switch Q2 is turned off, and the third transistor switch Q3 is turned off. At this time, the energy storage unit 21 is for discharging operation (Energy-releasing operation). When the energy storage unit 21 is in the discharging operation, the live wire terminal L, the energy storage unit 21, the second diode D2, the fourth diode D4, the first capacitor C1 and the neutral terminal N form a first discharging path Lnr1.

Please refer to FIG. 5 and FIG. 6. FIG. 5 is a schematic diagram of the second energy storage path when the embodiment of the uninterruptible power system of the present invention operates in the mains mode and operates in a negative half cycle; FIG. 6 is the second energy storage path of the present invention. The schematic diagram of the second energy release path when this embodiment of the uninterruptible power system is operating in the mains mode and operating in the negative half cycle. When the uninterrupted power system is operating in the mains mode (when the AC power supply is normal), and when the uninterrupted power system is operating in a negative half cycle: as shown in Figure 5, by controlling the first transistor switch Q1 to turn off, The second transistor switch Q2 is turned off, and the third transistor switch Q3 is turned on. At this time, the energy storage unit 21 is an energy storage operation. When the energy storage unit 21 is in an energy storage operation, the neutral terminal N, the third transistor switch Q3, the third diode D3, the energy storage unit 21 and the live terminal L form a second energy storage path Lns2.

As shown in FIG. 6, the first transistor switch Q1 is turned off, the second transistor switch Q2 is turned off, and the third transistor switch Q3 is turned off. At this time, the energy storage unit 21 is in an energy release operation. When the energy storage unit 21 is in the discharge operation, the neutral terminal N, the second capacitor C2, the fifth diode D5, the third diode D3, the energy storage unit 21, and the live terminal L form a second energy discharge Path Lnr2.

Please refer to FIG. 7 and FIG. 8. FIG. 7 is a schematic diagram of the third energy storage path when the embodiment of the uninterruptible power system of the present invention operates in battery mode and is in positive half-cycle operation; FIG. 8 is the third energy storage path of the present invention. The schematic diagram of the third energy release path when this embodiment of the uninterruptible power system is operating in battery mode and is operating in a half cycle. When the uninterrupted power system is operating in battery mode (when the AC power supply is abnormal), and when the uninterrupted power system is in positive half-cycle operation: As shown in FIG. 7, by controlling the first transistor switch Q1 to turn on, the second transistor switch Q2 to turn on, and the third transistor switch Q3 to turn on. At this time, the energy storage unit 21 is an energy storage operation. When the energy storage unit 21 is in energy storage operation, the positive electrode of the backup battery 12 (ie B1), the first diode D1, the energy storage unit 21, the second diode D2, the second transistor switch Q2, and the third The transistor switch Q3, the first transistor switch Q1, and the negative electrode of the backup battery 12 form a third energy storage path Lns3.

As shown in FIG. 8, by controlling the first transistor switch Q1 to turn on, the second transistor switch Q2 to turn off, and the third transistor switch Q3 to turn on. At this time, the energy storage unit 21 is in an energy release operation. When the energy storage unit 21 is in the discharge operation, the positive electrode of the backup battery B1, the first diode D1, the energy storage unit 21, the second diode D2, the fourth diode D4, the first capacitor C1, and the third The transistor switch Q3, the first transistor switch Q1, and the negative electrode of the backup battery 12 form a third energy release path Lnr3.

Please refer to FIG. 9 and FIG. 10. FIG. 9 is a schematic diagram of the fourth energy storage path when the embodiment of the uninterruptible power system of the present invention operates in battery mode and operates in a negative half cycle; FIG. 10 is the fourth energy storage path of the present invention. The schematic diagram of the fourth energy release path when this embodiment of the uninterruptible power system is operating in battery mode and operating in a negative half cycle. When the uninterrupted power system is operating in battery mode (when the AC power supply is abnormal), and when the uninterrupted power system is operating in a negative half cycle: as shown in FIG. 9, by controlling the first transistor switch Q1 to conduct, the second The transistor switch Q2 is turned on, and the third transistor switch Q3 is turned on. At this time, the energy storage unit 21 is an energy storage operation. When the energy storage unit 21 is in energy storage operation, the positive electrode of the backup battery B1, the first diode D1, the energy storage unit 21, the second diode D2, the second transistor switch Q2, and the third transistor switch Q3 , The first transistor switch Q1 and the negative electrode of the backup battery 12 form a fourth energy storage path Lns4.

As shown in FIG. 10, by controlling the first transistor switch Q1 to turn on, the second transistor switch Q2 to turn on, and the third transistor switch Q3 to turn off. At this time, the energy storage unit 21 is in an energy release operation. When the energy storage unit 21 is in the discharge operation, the positive electrode of the backup battery B1, the first diode D1, the energy storage unit 21, the second diode D2, the second transistor switch Q2, the second capacitor C2, and the fifth The diode D5, the first transistor switch Q1 and the negative electrode of the backup battery 12 form a fourth energy release path Lnr4.

As mentioned above, when using the uninterruptible power system of the present invention, if the AC power supply is normal, the AC power supply provides power supply in the commercial mode to the load 200 through the second circuit 20 and the third circuit 30, where the second circuit 20 And the third circuit 30 can perform voltage conversion processing (for example: Boost) on the AC power supply and then provide it to the load 200; if the AC power supply is abnormal (for example: surge, undervoltage or power failure), the first power of the first circuit 10 The switch circuit 11 and the second power switch circuit 22 and the third power switch circuit 23 of the second circuit 20 can be controlled through the on and off of the circuit, so that the electric energy output by the backup battery 12 can enter the first power switch circuit 11 through the first power switch circuit 11. The second circuit 20 and the third circuit 30 perform voltage conversion processing, so that the backup battery 12 provides battery-mode power supply to the load 200 through the first power switch circuit 11, the second circuit 20, and the third circuit 30.

For this reason, when the AC power supply is abnormal, only the first power switch circuit 11 can make the backup battery 12 perform voltage conversion processing through the second circuit 20 and the third circuit 30, without the need for additional independent AC power flow through For other voltage conversion circuits outside the path (for example: Push-Pull converter), the present invention simplifies the improvement of the circuit structure, does not need to occupy additional circuit board volume and wiring area, can reduce the circuit board substrate and process time, and then Solve continuously The technical problem of increasing the volume and cost of the electrical system can achieve the purpose of reducing production costs, improving production efficiency, and being portable.

In addition, the backup battery 12 of the present invention can be a conventional lead-acid battery or a lithium battery.

The above are only detailed descriptions and drawings of the preferred embodiments of the present invention. However, the features of the present invention are not limited to these, and are not intended to limit the present invention. The full scope of the present invention should be covered by the following patent application scope As the criterion, all embodiments that conform to the spirit of the patent application of the present invention and similar changes should be included in the scope of the present invention. Anyone familiar with the art in the field of the present invention can easily think of changes or Modifications can be covered in the following patent scope of this case.

10: The first circuit

11: The first power switch circuit

12: Backup battery

20: second circuit

21: Energy storage unit

22: The second power switch circuit

23: The third power switch circuit

30: third circuit

200: load

300: Input filter circuit

400: inverter

500: output filter circuit

Claims (14)

An uninterrupted power system, which is applied to provide uninterrupted power supply in a mains mode or a battery mode to a load. The uninterrupted power system includes: a first circuit coupled to a live terminal of an AC power supply; the first The circuit includes a first power switch circuit and a backup battery; wherein, the first power switch circuit is coupled to the backup battery, and the backup battery is coupled to the live terminal; a second circuit is coupled to the live terminal , The first circuit and a neutral terminal of an AC power supply; the second circuit includes an energy storage unit, a second power switch circuit, and a third power switch circuit coupled to each other; wherein, the energy storage unit Coupled to the live terminal and the backup battery, the second power switch circuit and the third power switch circuit are both coupled to the energy storage unit and the neutral terminal; the third power switch circuit is coupled to the first power Switch circuit; and a third circuit coupled to the first power switch circuit, the second power switch circuit, the third power switch circuit and the neutral terminal; wherein, when the AC power source is normal, the AC power source The second circuit and the third circuit provide the load with the power supply in the mains mode; when the AC power source is abnormal, the backup battery is connected to the load through the first power switch circuit, the second circuit and the third circuit. The load provides power for this battery mode. The uninterruptible power system described in claim 1, wherein the first circuit further includes a first diode, and the first power switch circuit includes a first transistor switch; wherein, the backup The battery is coupled to the live terminal and the energy storage unit through the first diode, the cathode of the first diode is coupled to the live terminal and the energy storage unit, and the first transistor switch is coupled to the The third power switch circuit and the third circuit, and the backup battery is coupled between the anode of the first diode and the first transistor switch. The uninterruptible power system described in the scope of patent application 2, wherein the second power switch circuit includes a second diode and a second transistor switch coupled in series; wherein, the second diode The anode of the second diode is coupled to the energy storage unit and the third power switch circuit, the cathode of the second diode is coupled to the second transistor switch and the third circuit; the second transistor switch is coupled to the third power The switch circuit, the third circuit and the neutral terminal. The uninterruptible power system described in item 3 of the scope of patent application, wherein the third power switch circuit includes a third diode and a third transistor switch coupled in series; wherein, the third diode The cathode is coupled to the energy storage unit, the anode of the second diode, and the anode of the third diode is coupled to the first transistor switch, the third transistor switch and the third circuit; the third The transistor switch is coupled to the second transistor switch, the first transistor switch, the third circuit and the neutral terminal. The uninterruptible power system described in claim 4, wherein the third circuit includes a fourth diode, a first capacitor, a second capacitor, and a fifth diode coupled in series; Wherein, the anode of the fourth diode is coupled to the cathode of the second diode and the second transistor switch, the cathode of the fourth diode is coupled to the first capacitor; the first capacitor is coupled to the The second transistor switch, the third transistor switch, the second capacitor, and the neutral terminal; the second capacitor is coupled to the second transistor switch, the third transistor switch, and the fifth diode The anode and the neutral terminal; the cathode of the fifth diode is coupled to the anode of the third diode, the third transistor switch, and the first transistor switch. The uninterruptible power system described in item 5 of the scope of patent application, wherein, when operating in the mains mode, and when the system is operating in a positive half cycle: the first transistor switch is turned off, and the second transistor switch Is turned on and the third transistor switch is turned off, the energy storage unit is an energy storage operation; and the first transistor switch is turned off, the second transistor switch is turned off, and the third transistor switch is turned off, the storage unit The energy unit is a release operation. The uninterruptible power system described in item 6 of the scope of patent application, wherein, when the energy storage unit is in energy storage operation, the live terminal, the energy storage unit, the second diode, and the second transistor switch And the neutral line end forms a first energy storage path; and when the energy storage unit is in an energy release operation, the live line end, the energy storage unit, the second diode, the fourth diode, the The first capacitor and the neutral terminal form a first discharge path. The uninterruptible power system described in item 5 of the scope of patent application, wherein, when operating in the mains mode and when the system is operating in a negative half cycle: the first transistor switch is turned off, and the second transistor switch Is turned off and the third transistor switch is turned on, the energy storage unit is an energy storage operation; and the first transistor switch is turned off, the second transistor switch is turned off, and the third transistor switch is turned off, the storage unit The energy unit is the energy release operation. For example, the uninterruptible power system described in item 8 of the scope of patent application, wherein, when the energy storage unit is in energy storage operation, the neutral terminal, the third transistor switch, the third diode, and the storage The energy unit and the live wire end form a second energy storage path; and When the energy storage unit is in an energy release operation, the neutral terminal, the second capacitor, the fifth diode, the third diode, the energy storage unit, and the live wire end form a second energy release path. The uninterruptible power system described in item 5 of the scope of patent application, wherein, when operating in the battery mode, and when the system is operating in a positive half cycle: the first transistor switch is turned on, and the second transistor switch is turned on And the third transistor switch is turned on, the energy storage unit is an energy storage operation; and the first transistor switch is turned on, the second transistor switch is turned off, and the third transistor switch is turned on, the energy storage unit is released Can operate. For example, the uninterruptible power system described in item 10 of the scope of patent application, wherein, when the energy storage unit is in energy storage operation, a positive electrode of the backup battery, the first diode, the energy storage unit, and the first The two diodes, the second transistor switch, the third transistor switch, the first transistor switch, and a negative electrode of the backup battery form a third energy storage path; and when the energy storage unit is discharging energy In operation, the positive electrode of the backup battery, the first diode, the energy storage unit, the second diode, the fourth diode, the first capacitor, the third transistor switch, the The first transistor switch and the negative electrode of the backup battery form a third energy release path. The uninterruptible power system described in item 5 of the scope of patent application, wherein, when operating in the battery mode and when the system is operating in a negative half cycle: the first transistor switch is turned on and the second transistor switch is turned on And the third transistor switch is turned on, the energy storage unit is an energy storage operation; and the first transistor switch is turned on, the second transistor switch is turned on, and the third transistor switch is turned off, the energy storage unit is released Can operate. For example, the uninterruptible power system described in item 12 of the scope of patent application, wherein, when the energy storage unit is in energy storage operation, a positive electrode of the backup battery, the first diode, the energy storage unit, and the first The two diodes, the second transistor switch, the third transistor switch, the first transistor switch, and a negative electrode of the backup battery form a fourth energy storage path; and when the energy storage unit is discharging energy During operation, the positive electrode of the backup battery, the first diode, the energy storage unit, the second diode, the second transistor switch, the second capacitor, the fifth diode, the The first transistor switch and the negative electrode of the backup battery form a fourth energy release path. For example, the uninterruptible power system described in any one of items 1 to 13 of the scope of patent application, wherein the energy storage unit is an inductor, and the backup battery is a lithium battery or a lead-acid battery.

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