CN110867949A - Uninterrupted power system - Google Patents
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- CN110867949A CN110867949A CN201911199757.7A CN201911199757A CN110867949A CN 110867949 A CN110867949 A CN 110867949A CN 201911199757 A CN201911199757 A CN 201911199757A CN 110867949 A CN110867949 A CN 110867949A
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- 238000004146 energy storage Methods 0.000 claims abstract description 140
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- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical group [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 claims description 4
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J9/00—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting
- H02J9/04—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source
- H02J9/06—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems
- H02J9/062—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems for AC powered loads
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Abstract
An uninterruptible power system for providing uninterruptible power to a load, comprising: the first circuit is coupled to the live wire terminal of the AC power supply, the second circuit is coupled to the live wire terminal, the first circuit and the neutral wire terminal of the AC power supply, and the third circuit is coupled to the first circuit, the second circuit and the neutral wire terminal. The first circuit comprises a first power switch circuit and a backup battery; the second circuit comprises an energy storage unit, a second power switch circuit and a third power switch circuit which are coupled; the third circuit is coupled to the first power switch circuit, the second power switch circuit, the third power switch circuit and the neutral terminal. The invention solves the technical problem of volume and cost increase of the UPS through the simplified improvement of the circuit framework, thereby achieving the purposes of reducing the production cost, improving the production efficiency and being portable in use.
Description
The technical field is as follows:
the present invention relates to an uninterruptible power system, and more particularly, to an uninterruptible power system for providing a load with a commercial power mode or a battery mode.
Background
Generally, when a converter with a Power Factor Correction (PFC) function is applied to a battery mode under a 3kVA architecture of a current Uninterruptible Power System (UPS), the converter continuously provides a backup ac Power supply for load devices such as electrical appliances under the condition of Power grid abnormality or Power failure to maintain normal operation of the electrical appliances. Uninterruptible power systems are commonly used to maintain uninterrupted power to critical commercial devices or sophisticated equipment such as computers, servers, etc., preventing loss of data, interruption of communications, or loss of control of the device.
However, when the current Uninterruptible Power System (UPS) operates in a battery mode under a 3kVA architecture, the conventional DC-to-DC (DC-to-DC) converter is a Push-Pull architecture, which is different from the Boost circuit at one end of the ac power grid. Therefore, the area of the wiring on the circuit board is too large, the substrate and the processing time of the circuit board are increased, and the size and the cost of the UPS are increased.
Therefore, how to design an improved uninterruptible power system, especially an improvement on simplifying the circuit structure, to solve the problem of the increased size and cost of the above-mentioned uninterruptible power system is an important issue to be studied.
The invention content is as follows:
the present invention provides an uninterruptible power system, which solves the problem of increasing the size and cost of the above-mentioned uninterruptible power system by improving the simplified circuit structure, so as to achieve the purposes of reducing the production cost, improving the production efficiency and being portable in use.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows: an uninterruptible power system for providing a load with a mains-mode or a battery-mode uninterruptible power supply, comprising:
the first circuit is coupled with a live wire end of an alternating current power supply; the first circuit comprises a first power switch circuit and a backup battery; wherein, the first power switch circuit is coupled with the live wire end;
the second circuit is coupled with the live wire end, the first circuit and a neutral wire end of an alternating current power supply; the second circuit comprises an energy storage unit, a second power switch circuit and a third power switch circuit which are coupled with each other; the energy storage unit is coupled with the live wire end and the first power switch circuit, and the second power switch circuit and the third power switch circuit are both coupled with the energy storage unit and the neutral wire end; the third power switch circuit is coupled with 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;
when the alternating current power supply is normal, the alternating current power supply provides the power supply of the commercial power mode for the load through the second circuit and the third circuit; when the alternating current power supply is abnormal, the backup battery provides the battery mode power supply for the load through the first power switch circuit, the second circuit and the third circuit.
Further, the first power switch circuit includes a first diode and a first transistor switch; the first diode has a cathode 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 between the anode of the first diode and the first transistor switch.
Further, wherein the second power switch circuit comprises 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 the third power switch circuit, and 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, 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 and 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 transistor switch is coupled to the second transistor switch, the first transistor switch, the third circuit and the neutral terminal.
Further, 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, and 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; the cathode of the fifth diode is coupled to the anode of the third diode, the third transistor switch and the first transistor switch.
Further, when operating in the utility mode and when the system is operating in a positive half cycle: the first transistor switch is turned off, the second transistor switch is turned on, the third transistor switch is turned off, and the energy storage unit is in 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 energy storage unit is operated to release energy.
Further, when the energy storage unit is in energy storage operation, the live wire end, the energy storage unit, the second diode, the second transistor switch and the neutral wire end form a first energy storage path; and when the energy storage unit is in energy release operation, the fire 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.
Further, when operating in the utility mode, and when the system is operating in a negative half cycle: the first transistor switch is turned off, the second transistor switch is turned off, the third transistor switch is turned on, and the energy storage unit is in 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 energy storage unit is operated to release energy.
Further, 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 fire terminal form a second energy storage path; and when the energy storage unit is in energy release operation, a second energy release path is formed by the neutral terminal, the second capacitor, the fifth diode, the third diode, the energy storage unit and the fire wire terminal.
Further, when operating in the battery mode, and when the system is operating for a positive half cycle: the first transistor switch is turned on, the second transistor switch is turned on, the third transistor switch is turned on, and the energy storage unit is in 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 operated to release energy.
Further, when the energy storage unit is in energy storage operation, the anode of the backup battery, the first diode, the energy storage unit, the second diode, the second transistor switch, the third transistor switch, the first transistor switch and the cathode of the backup battery form a third energy storage path; and when the energy storage unit is in energy release operation, the anode 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 first transistor switch and the cathode of the backup battery form a third energy release path.
Further, when operating in the battery mode, and when the system is operating for a negative half cycle: the first transistor switch is turned on, the second transistor switch is turned on, the third transistor switch is turned on, and the energy storage unit is in 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 operated to release energy.
Further, 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, 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 in energy release operation, the anode 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 first transistor switch and the cathode of the backup battery form a fourth energy release path.
Further, the energy storage unit is an inductor, and the backup battery is a lithium battery or a lead-acid battery.
Compared with the prior art, the invention has the beneficial effects that:
1. when the uninterruptible power system is used, if an alternating current power supply is normal, the alternating current power supply supplies power in a commercial power mode to a load through the second circuit and the third circuit, wherein the second circuit and the third circuit can perform voltage conversion processing (for example, Boost boosting) on the alternating current power supply and then supply the voltage to the load; if the alternating current power supply is abnormal (such as surge, undervoltage or power failure), the first power switch circuit of the first circuit and the second power switch circuit and the third power switch circuit of the second circuit can be controlled to be switched on and off through the circuits, so that the electric energy output by the backup battery can enter the second circuit and the third circuit through the first power switch circuit to be subjected to voltage conversion processing, and the backup battery can provide power supply in a battery mode for the load through the first power switch circuit, the second circuit and the third circuit.
Therefore, when the alternating current power supply is abnormal, the backup battery can carry out voltage conversion processing through the second circuit and the third circuit only through the first power switch circuit, and other voltage conversion circuits (such as a Push-Pull converter) which are independent of the alternating current power supply flowing path are not needed.
Drawings
FIG. 1 is a schematic diagram of an uninterruptible power system configured in an uninterruptible power system according to an embodiment of the present invention;
FIG. 2 is a circuit diagram of the UPS according to the embodiment of the present invention;
FIG. 3 is a schematic diagram of a first energy storage path of the UPS according to the embodiment of the present invention in the commercial power mode and in the positive half cycle operation;
FIG. 4 is a schematic diagram of a first energy release path when the UPS of the present invention operates in the commercial power mode and operates in the positive half cycle;
FIG. 5 is a diagram illustrating a second energy storage path of the UPS according to the embodiment of the present invention in the commercial power mode and during the negative half cycle operation;
FIG. 6 is a schematic diagram of a second energy release path when the UPS of the present invention operates in the commercial power mode and operates in the negative half cycle;
FIG. 7 is a schematic diagram of a third energy storage path of the UPS according to the present invention in the battery mode and in the positive half cycle operation;
FIG. 8 is a schematic diagram of a third energy release path when the UPS is operated in the battery mode and in the positive half cycle operation according to the embodiment of the present invention;
FIG. 9 is a diagram illustrating a fourth energy storage path when the UPS is operated in the battery mode and in the negative half cycle operation according to the embodiment of the present invention; and
FIG. 10 is a diagram illustrating a fourth energy release path when the UPS is operated in the battery mode and in the negative half cycle operation according to the embodiment of the present invention.
Wherein, the power supply circuit comprises a first circuit 10, a first power switch circuit 11, a backup battery 12, a second circuit 20, a power storage unit 21, a second power switch circuit 22, a third power switch circuit 23, a third power switch circuit 30, a first diode of D1, a second diode of D2, a third diode of D3, a fourth diode of D4, a fifth diode of D5, a first transistor switch of Q1, a second transistor switch of Q2, a third transistor switch of Q3, a 200 load, a 300 input filter circuit, a 400 inverter, a 500 output filter circuit, a first capacitor of C1, a second capacitor of C2, an L line end, an N neutral line end, a Lns1 first energy storage path, a second energy storage path of Lns2, a third energy storage path of Lns3, a fourth energy storage path of Lns4, a first energy release path of Lnr1, a second energy release path of Lnr2, a third energy release path of Lnr3, a fourth energy release path of Lnr4, a backup inductor of B1, a battery 1.
The specific implementation mode is as follows:
the following description is given of embodiments of the present invention with reference to specific embodiments, and other advantages and effects of the present invention will be apparent to those skilled in the art from the disclosure of the present invention. The invention is capable of other and different embodiments and its several details are capable of modification and various changes in form and detail can be made without departing from the spirit and scope of the invention.
It should be understood that the structures, ratios, sizes, and numbers of elements shown in the drawings and described in the specification are only used for understanding and reading the present disclosure, and are not used to limit the conditions of the present disclosure, so they have no technical significance, and any structural modifications, ratio changes or size adjustments should fall within the scope of the present disclosure without affecting the function and the achievable purpose of the present disclosure.
The first embodiment is as follows: referring to fig. 1 and fig. 2, fig. 1 is a schematic diagram of an uninterruptible power system configured in an embodiment of the uninterruptible power system according to the present invention; FIG. 2 is a circuit diagram of the UPS according to the embodiment of the present invention. An embodiment of the uninterruptible power system of the present invention is applied to provide a mains-mode or battery-mode uninterruptible power supply to the load 200, and the uninterruptible power system includes: a first circuit 10, a second circuit 20 and a third circuit 30.
The first circuit 10 is coupled to a live line terminal L of an ac power source. The first circuit 10 includes a first power switch circuit 11 and a backup battery 12 (as shown by element B1, which may be a lithium battery or a lead-acid battery in this embodiment, but the invention is not limited thereto); the first power switch circuit 11 is coupled to the line terminal L. In detail, the first power switch circuit 11 includes a first diode D1 and a first transistor switch Q1. The cathode of the first diode D1 is coupled to the live line terminal L and the energy storage unit 21 (in the embodiment, the inductor L1) of the second circuit 20, the first transistor switch Q1 is coupled to the third power switch circuit 23 and the third circuit 30, and the backup battery 12 is coupled between the anode of the first diode D1 and the first transistor switch Q1.
The second circuit 20 is coupled to the line terminal L of the ac power source, the first circuit 10 and the neutral terminal N of the ac power source. The second circuit 20 includes an energy storage unit 21 (an inductor L1 in the present embodiment), 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 line terminal L and the first power switch circuit 11. The second power switch circuit 22 and the third power switch circuit 23 are both 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. Wherein, 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; a second transistor switch Q2 coupled to the third power switch circuit 23,
A third circuit 30 and a neutral terminal N. The third power switch circuit 23 includes a third diode D3 and a third transistor switch Q3 coupled in series. Wherein, the cathode of the third diode D3 is coupled to the energy storage unit 21 and 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. 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, each of the transistor switches may be, for example, but not limited to, a Metal Oxide Semiconductor Field Effect Transistor (MOSFET), a Bipolar Junction Transistor (BJT), or an Insulated Gate Bipolar Transistor (IGBT).
In the embodiment of the present invention, the ups system is coupled to the input filter circuit 300, wherein the input filter circuit 300 may be an EMI filter circuit for filtering noise such as electromagnetic interference (EMI) of an input ac power (as shown in fig. 1), and the ups system converts the dc power outputted from the ups system into ac power through the coupling inverter 400, and is coupled to the output filter circuit 500, wherein the output filter circuit 500 may be an EMI filter circuit for filtering noise such as electromagnetic interference outputted to the load 200. When the ac power supply is normal, the ac power supply provides the load 200 with the power supply in the mains supply mode through the second circuit 20 and the third circuit 30; when the ac power supply is abnormal, the backup battery B1 supplies power to the load 200 in a battery mode through the first power switch circuit 11, the second circuit 20, and the third circuit 30.
The second embodiment is as follows: referring to fig. 3 and 4, fig. 3 is a schematic diagram of a first energy storage path of the uninterruptible power system of the embodiment of the invention when the uninterruptible power system is operated in a mains power mode and is operated in a positive half cycle; fig. 4 is a schematic diagram of a first energy release path of the uninterruptible power system of the embodiment of the invention when the uninterruptible power system is operated in the utility power mode and is operating in the positive half cycle. When the UPS is operated in the commercial power mode (when the AC power supply is normal), and when the UPS is operated in the normal half cycle:
as shown in fig. 3, the first transistor switch Q1 is turned 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 (i.e., the inductor L1) is in energy-storing operation (energy-storing). When the energy storage unit 21 is in energy storage operation, the line 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 Lns 1.
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 energy-releasing operation (energy-releasing operation). When the energy storage unit 21 is in the energy releasing operation, the live line terminal L, the energy storage unit 21, the second diode D2, the fourth diode D4, the first capacitor C1 and the neutral line terminal N form a first energy releasing path Lnr 1.
The third concrete implementation mode: referring to fig. 5 and fig. 6, fig. 5 is a schematic diagram of a second energy storage path when the uninterruptible power system of the embodiment of the invention is operated in the utility power mode and operated at the negative half cycle; fig. 6 is a schematic diagram of a second energy release path of the uninterruptible power system of the embodiment of the invention in the utility power mode and during the negative half cycle operation. When the UPS is operated in the commercial power mode (when the AC power supply is normal), and when the UPS is operated in the negative half cycle:
as shown in fig. 5, the first transistor switch Q1 is turned 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 in an energy storage operation. When the energy storage unit 21 is in energy storage operation, the neutral terminal N, the third transistor switch Q3, the third diode D3, the energy storage unit 21 and the line terminal L form a second energy storage path Lns 2.
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 the energy releasing operation. When the energy storage unit 21 is in the energy releasing 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 releasing path Lnr 2.
The fourth concrete implementation mode: referring to fig. 7 and 8, fig. 7 is a schematic diagram illustrating a third energy storage path when the uninterruptible power system of the embodiment of the invention is in the battery mode and is operating in the positive half cycle; FIG. 8 is a schematic diagram of a third energy release path when the UPS according to the embodiment of the present invention is operated in the battery mode and in the positive half cycle operation. When the UPS is operated in a battery mode (when the AC power supply is abnormal), and when the UPS is operated in a positive half cycle:
as shown in fig. 7, the first transistor switch Q1, the second transistor switch Q2, and the third transistor switch Q3 are controlled to be turned on. At this time, the energy storage unit 21 is in an energy storage operation. When the energy storage unit 21 is in the energy storage operation, the positive electrode of the backup battery 12 (i.e., B1), the first diode D1, the energy storage unit 21, the second diode D2, the second transistor switch Q2, the third transistor switch Q3, the first transistor switch Q1, and the negative electrode of the backup battery 12 form a third energy storage path Lns 3.
As shown in fig. 8, the first transistor switch Q1 is turned on, 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 in the energy releasing operation. When the energy storage unit 21 is in the energy releasing operation, the anode 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, the third transistor switch Q3, the first transistor switch Q1, and the cathode of the backup battery 12 form a third energy releasing path Lnr 3.
The fifth concrete implementation mode: referring to fig. 9 and 10, fig. 9 is a schematic diagram illustrating a fourth energy storage path when the uninterruptible power system of the embodiment of the invention is operated in the battery mode and operated in the negative half cycle; FIG. 10 is a diagram illustrating a fourth energy release path when the UPS according to the embodiment of the present invention is operated in the battery mode and in the negative half cycle operation. When the UPS is operated in a battery mode (when the AC power supply is abnormal), and when the UPS is operated in a negative half cycle:
as shown in fig. 9, the first transistor switch Q1, the second transistor switch Q2, and the third transistor switch Q3 are controlled to be turned on. At this time, the energy storage unit 21 is in an energy storage operation. When the energy storage unit 21 is in the 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, 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 Lns 4.
As shown in fig. 10, the first transistor switch Q1 is turned on, 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 is in the energy releasing operation. When the energy storage unit 21 is in the energy releasing 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, the fifth diode D5, the first transistor switch Q1, and the negative electrode of the backup battery 12 form a fourth energy releasing path Lnr 4.
As mentioned above, when the uninterruptible power system of the present invention is used, if the ac power is normal, the ac power is supplied to the load 200 in the utility mode through the second circuit 20 and the third circuit 30, wherein the second circuit 20 and the third circuit 30 can perform voltage conversion (for example, Boost) on the ac power and then supply the ac power to the load 200; for example, in case of an ac power abnormality (e.g., a surge, an undervoltage or a power failure), the first power switch circuit 11 of the first circuit 10 and the second power switch circuit 22 and the third power switch circuit 23 of the second circuit 20 may be controlled to be turned on and off, so that the electric energy output by the backup battery 12 may enter the second circuit 20 and the third circuit 30 through the first power switch circuit 11 for voltage conversion processing, and the backup battery 12 provides the load 200 with power in a battery mode through the first power switch circuit 11, the second circuit 20 and the third circuit 30.
Therefore, when the AC power supply is abnormal, the backup battery 12 can perform voltage conversion processing through the second circuit 20 and the third circuit 30 only by the first power switch circuit 11, and other voltage conversion circuits (such as a Push-Pull converter) which are independent of the AC power supply flowing path are not needed.
In addition, the backup battery 12 of the present invention may be a conventional lead-acid battery or a lithium battery.
While the invention has been described in connection with what is presently considered to be the most practical and preferred embodiment, it is to be understood that the invention is not to be limited to the disclosed embodiment, but on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims.
Claims (14)
1. An uninterruptible power system for providing a load with an uninterruptible power supply in a mains mode or a battery mode, comprising: the uninterruptible power system comprises:
the first circuit is coupled with a live wire end of an alternating current power supply; the first circuit comprises a first power switch circuit and a backup battery; wherein, the first power switch circuit is coupled with the live wire end;
the second circuit is coupled with the live wire end, the first circuit and a neutral wire end of an alternating current power supply; the second circuit comprises an energy storage unit, a second power switch circuit and a third power switch circuit which are coupled with each other; the energy storage unit is coupled with the live wire end and the first power switch circuit, and the second power switch circuit and the third power switch circuit are both coupled with the energy storage unit and the neutral wire end; the third power switch circuit is coupled with 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;
when the alternating current power supply is normal, the alternating current power supply provides the power supply of the commercial power mode for the load through the second circuit and the third circuit; when the alternating current power supply is abnormal, the backup battery provides the battery mode power supply for the load through the first power switch circuit, the second circuit and the third circuit.
2. An uninterruptible power system according to claim 1, wherein: the first power switch circuit includes a first diode and a first transistor switch; the first diode has a cathode 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 between the anode of the first diode and the first transistor switch.
3. An uninterruptible power system according to claim 2, wherein: wherein the second power switch circuit comprises 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 the third power switch circuit, and 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.
4. An uninterruptible power system according to claim 3, wherein: wherein the third power switch circuit comprises 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 and 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 transistor switch is coupled to the second transistor switch, the first transistor switch, the third circuit and the neutral terminal.
5. An uninterruptible power system according to 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, and 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; the cathode of the fifth diode is coupled to the anode of the third diode, the third transistor switch and the first transistor switch.
6. An uninterruptible power system according to claim 5, wherein: wherein, when operating in the commercial power mode and when the system is operating in a positive half cycle: the first transistor switch is turned off, the second transistor switch is turned on, the third transistor switch is turned off, and the energy storage unit is in 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 energy storage unit is operated to release energy.
7. An uninterruptible power system according to claim 6, wherein: when the energy storage unit is in energy storage operation, a first energy storage path is formed by the live wire end, the energy storage unit, the second diode, the second transistor switch and the neutral wire end; and when the energy storage unit is in energy release operation, the fire 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.
8. An uninterruptible power system according to claim 5, 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, the second transistor switch is turned off, the third transistor switch is turned on, and the energy storage unit is in 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 energy storage unit is operated to release energy.
9. An uninterruptible power system according to claim 8, wherein: 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 wire terminal form a second energy storage path; and when the energy storage unit is in energy release operation, a second energy release path is formed by the neutral terminal, the second capacitor, the fifth diode, the third diode, the energy storage unit and the fire wire terminal.
10. An uninterruptible power system according to claim 9, wherein: when operating in the battery mode, and when the system is operating for a positive half cycle: the first transistor switch is turned on, the second transistor switch is turned on, the third transistor switch is turned on, and the energy storage unit is in 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 operated to release energy.
11. An uninterruptible power system according to claim 10, wherein: when the energy storage unit is in energy storage operation, the anode of the backup battery, the first diode, the energy storage unit, the second diode, the second transistor switch, the third transistor switch, the first transistor switch and the cathode of the backup battery form a third energy storage path; and when the energy storage unit is in energy release operation, the anode 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 first transistor switch and the cathode of the backup battery form a third energy release path.
12. An uninterruptible power system according to claim 5, wherein: when operating in the battery mode, and when the system is operating for a negative half cycle: the first transistor switch is turned on, the second transistor switch is turned on, the third transistor switch is turned on, and the energy storage unit is in 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 operated to release energy.
13. An uninterruptible power system according to claim 12, wherein: when the energy storage unit is in energy storage operation, the anode of the backup battery, the first diode, the energy storage unit, the second diode, the second transistor switch, the third transistor switch, the first transistor switch and the cathode of the backup battery form a fourth energy storage path; and when the energy storage unit is in energy release operation, the anode 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 first transistor switch and the cathode of the backup battery form a fourth energy release path.
14. An uninterruptible power system according to claims 1-13 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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