CN116632840A - Double-line mains supply input split phase output power supply system - Google Patents
Double-line mains supply input split phase output power supply system Download PDFInfo
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- CN116632840A CN116632840A CN202310906493.4A CN202310906493A CN116632840A CN 116632840 A CN116632840 A CN 116632840A CN 202310906493 A CN202310906493 A CN 202310906493A CN 116632840 A CN116632840 A CN 116632840A
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- 238000001514 detection method Methods 0.000 claims description 14
- 230000000694 effects Effects 0.000 abstract description 6
- 238000006243 chemical reaction Methods 0.000 abstract description 4
- 238000010586 diagram Methods 0.000 description 3
- 230000008094 contradictory effect Effects 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
Classifications
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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
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/007—Arrangements for selectively connecting the load or loads to one or several among a plurality of power lines or power sources
-
- 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
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/28—Arrangements for balancing of the load in a network by storage of energy
- H02J3/32—Arrangements for balancing of the load in a network by storage of energy using batteries with converting means
-
- 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
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0068—Battery or charger load switching, e.g. concurrent charging and load supply
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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
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/02—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries for charging batteries from ac mains by converters
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/483—Converters with outputs that each can have more than two voltages levels
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/53—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/537—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters
- H02M7/5387—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration
- H02M7/53871—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration with automatic control of output voltage or current
-
- 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
- H02J2207/00—Indexing scheme relating to details of circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J2207/20—Charging or discharging characterised by the power electronics converter
Abstract
The invention provides a double-line mains supply input split-phase output power supply system which comprises a battery, an inverter circuit and a mains supply switch circuit, wherein the battery is connected with the inverter circuit; when no commercial power is connected into the power supply system, the commercial power switch circuit cuts off a passage between the first commercial power end and the inverter circuit and cuts off a passage between the second commercial power end and the inverter circuit, and the inverter circuit converts the voltage of the battery into first alternating current and second alternating current and outputs the first alternating current and the second alternating current to a load; when mains supply is connected to the power supply system, the mains supply switch circuit conducts a passage between the first mains supply end and the inverter circuit and conducts a passage between the second mains supply end and the inverter circuit, so that alternating current output by the mains supply is output to the inverter circuit, the inverter circuit rectifies voltage of the mains supply into direct current, and the direct current is output to the battery through the first power supply end and the second power supply end to charge the battery. According to the invention, the AC/DC conversion is carried out on the commercial power and the battery through the inverter circuit, so that the effect of double-commercial power input and double-voltage inversion output is realized.
Description
Technical Field
The invention relates to the technical field of power supply circuits, in particular to a double-line mains supply input split phase output power supply system.
Background
At present, the mobile power supply and the household power supply in the market can only realize single-mains-supply input and single-voltage output, and cannot realize single-mains-supply input and double-voltage inversion output, namely, the mobile power supply and the household power supply cannot realize split-phase output. For example, the household power voltages in the united states or japan are of two types, 120Vac and 240Vac, respectively, wherein 120Vac is used to power small household appliances, and 240Vac is used to power high-power household appliances such as refrigerators, air conditioners, electric drills. However, the current portable power sources in the market can only output 120Vac voltage to supply power to the load or output 240Vac voltage to supply power to the load, and the two output voltages cannot be compatible, i.e. the two output voltages cannot be output simultaneously.
Disclosure of Invention
The invention mainly aims to provide a double-line mains supply input split-phase output power supply system, which aims to solve the problem that a mobile power supply cannot realize double-voltage output.
Therefore, the present invention proposes a two-wire mains input split phase output power supply system, comprising:
a battery;
an inverter circuit;
the first input end of the mains supply switch circuit is connected with a first mains supply end, the second input end of the mains supply switch circuit and the third input end of the mains supply switch circuit are connected with a second mains supply end, the first output end of the mains supply switch circuit is connected with the first end of the inverter circuit, the second output end of the mains supply switch circuit is connected with the second end of the inverter circuit, and the third output end of the mains supply switch circuit is connected with the third end of the inverter circuit; the mains supply switch circuit is used for disconnecting the passage between the first mains supply end and the inverter circuit and disconnecting the passage between the second mains supply end and the inverter circuit when no mains supply is connected; when mains supply is connected, a passage between a first mains supply end and the inverter circuit is conducted, and a passage between a second mains supply end and the inverter circuit is conducted, so that alternating current output by the mains supply is output to the inverter circuit;
the first power end of the inverter circuit is connected with the positive electrode of the battery, and the second power end of the inverter circuit is connected with the negative electrode of the battery; the inverter circuit can invert the direct current output by the battery into first alternating current and second alternating current when no commercial power is connected; and when the commercial power is connected, rectifying the alternating current output by the commercial power and outputting the rectified alternating current to the battery so as to charge the battery.
Optionally, the dual-line mains input split phase output power supply system further includes:
the first input end of the load switch circuit is connected with the first end of the inverter circuit, the second input end of the load switch circuit is connected with the second end of the inverter circuit, and the third input end of the load switch circuit is connected with the third end of the inverter circuit; the first output end of the load switch circuit is connected with the first load end, the second output end of the load switch circuit is connected with the second load end, and the third output end of the load switch circuit is connected with the third load end;
the load switch circuit is used for conducting a passage between the inverter circuit and the second load end and a passage between the inverter circuit and the third load end when no commercial power is connected, so that the first alternating current and the second alternating current are output to the second load and the third load through the second load end and the third load end to supply power for the second load and the third load; and when mains supply is connected, disconnecting the path between the inverter circuit and the second load end and disconnecting the path between the inverter circuit and the third load end.
Optionally, when no mains supply is connected, the voltage of the first load end differs from the voltage of the second load end by a first preset voltage; the voltage of the second load end is different from the voltage of the third load end by a second preset voltage; the voltage of the first load end is different from the voltage of the third load end by a third preset voltage.
Optionally, when the first mains supply is connected, the voltage of the first load end differs from the voltage of the second load end by a fourth preset voltage; the voltage of the second load end is different from the voltage of the third load end by a fifth preset voltage; the voltage of the first load end is different from the voltage of the third load end by a sixth preset voltage.
Optionally, when the second mains supply is connected, the voltage of the first load end differs from the voltage of the second load end by a seventh preset voltage; the voltage of the second load end is different from the voltage of the third load end by an eighth preset voltage; the voltage of the first load end is different from the voltage of the third load end by a ninth preset voltage.
Optionally, the inverter circuit includes a first three-level bridge arm circuit and a second three-level bridge arm circuit;
the middle end of the first three-level bridge arm circuit and the middle end of the second three-level bridge arm circuit are all third ends of the inverter circuit; the output end of the first three-level bridge arm circuit is the first end of the inverter circuit, and the output ends of the three-level bridge arm circuits are both the second ends of the inverter circuit.
Optionally, the load switching circuit includes a fourth relay, a fifth relay, a sixth relay, and a seventh relay; the first end of the fourth relay is connected with a first load end, the first end of the fifth relay is connected with a second load end, and the first end of the seventh relay is respectively connected with a third load end and the first end of the sixth relay;
the second end of the fourth relay is connected with the third end of the inverter circuit, the second end of the fifth relay is respectively connected with the first end of the inverter circuit and the second end of the sixth relay, and the second ends of the seventh relay are connected with the second end of the inverter circuit.
Optionally, the mains switch circuit includes a first relay, a second relay, and a third relay;
the first end of the first relay is connected with a first mains supply end, and the first end of the second relay and the first end of the third relay are connected with a second mains supply end;
the second end of the first relay is connected with the first end of the inverter circuit, the second end of the second relay is connected with the second end of the inverter circuit, and the second end of the third relay is connected with the first end of the fourth relay.
Optionally, the dual-line mains input split phase output power supply system further includes:
the first input end of the current detection circuit is connected with the second output end of the load switch circuit, and the second input end of the current detection circuit is connected with the third output end of the load switch circuit;
the current detection circuit is used for detecting the current of the first alternating current and the current of the second alternating current and outputting the detection result to the display circuit.
The invention provides a double-line mains supply input split-phase output power supply system which comprises a battery, an inverter circuit and a mains supply switch circuit, wherein the battery is connected with the inverter circuit; when no commercial power is connected into the power supply system, the commercial power switch circuit cuts off a passage between the first commercial power end and the inverter circuit and cuts off a passage between the second commercial power end and the inverter circuit, and the inverter circuit converts the voltage of the battery into first alternating current and second alternating current and outputs the first alternating current and the second alternating current to a load; when mains supply is connected to the power supply system, the mains supply switch circuit conducts a passage between the first mains supply end and the inverter circuit and conducts a passage between the second mains supply end and the inverter circuit, so that alternating current output by the mains supply is output to the inverter circuit, the inverter circuit rectifies voltage of the mains supply into direct current, and the direct current is output to the battery through the first power supply end and the second power supply end to charge the battery. According to the invention, the AC/DC conversion is carried out on the commercial power and the battery through the inverter circuit, so that the effect of double-commercial power input and double-voltage inversion output is realized.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to the structures shown in these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a circuit functional block diagram of a two-wire mains input split phase output power supply system of the present invention;
FIG. 2 is a circuit functional block diagram of another embodiment of a two-wire mains input split phase output power supply system of the present invention;
fig. 3 is a circuit structure diagram of the two-wire mains input split phase output power supply system of the present invention.
The achievement of the objects, functional features and advantages of the present invention will be further described with reference to the accompanying drawings, in conjunction with the embodiments.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
It should be noted that all directional indicators (such as up, down, left, right, front, and rear … …) in the embodiments of the present invention are merely used to explain the relative positional relationship, movement, etc. between the components in a particular posture (as shown in the drawings), and if the particular posture is changed, the directional indicator is changed accordingly.
In the present invention, unless specifically stated and limited otherwise, the terms "connected," "affixed," and the like are to be construed broadly, and for example, "affixed" may be a fixed connection, a removable connection, or an integral body; can be mechanically or electrically connected; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.
Furthermore, descriptions such as those referred to as "first," "second," and the like, are provided for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implying an order of magnitude of the indicated technical features in the present disclosure. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions of the embodiments may be combined with each other, but it is necessary to base that the technical solutions can be realized by those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should be considered to be absent and not within the scope of protection claimed in the present invention.
It is to be understood that the mobile power supply and the household power supply on the market at present can only realize single-mains input and single-voltage output, but cannot realize single-mains input and double-voltage inversion output, namely, the mobile power supply and the household power supply cannot realize split-phase output. For example, the household power voltages in the united states or japan are of two types, 120Vac and 240Vac, respectively, wherein 120Vac is used to power small household appliances, and 240Vac is used to power high-power household appliances such as refrigerators, air conditioners, electric drills. However, the current portable power sources in the market can only output 120Vac voltage to supply power to the load or output 240Vac voltage to supply power to the load, and the two output voltages cannot be compatible, i.e. the two output voltages cannot be output simultaneously.
The invention provides a double-line mains input split phase output power supply system, referring to fig. 1 and 3, comprising:
a battery 30;
an inverter circuit 20;
the power supply switching circuit 10, wherein a first input end of the power supply switching circuit 10 is connected with a first power supply end L, a second input end of the power supply switching circuit 10 and a third input end of the power supply switching circuit 10 are connected with a second power supply end N, a first output end of the power supply switching circuit 10 is connected with a first end of the inverter circuit 20, a second output end of the power supply switching circuit 10 is connected with a second end of the inverter circuit 20, and a third output end of the power supply switching circuit 10 is connected with a third end of the inverter circuit 20; the mains switch circuit 10 is configured to disconnect a path between the first mains terminal L and the inverter circuit 20 and disconnect a path between the second mains terminal N and the inverter circuit 20 when no mains is connected; and when the mains supply is connected, a passage between the first mains supply end L and the inverter circuit 20 and a passage between the second mains supply end N and the inverter circuit 20 are conducted, so that alternating current output by the mains supply is output to the inverter circuit 20;
a first power end of the inverter circuit 20 is connected with the positive electrode of the battery 30, and a second power end of the inverter circuit 20 is connected with the negative electrode of the battery 30; the inverter circuit 20 can invert the direct current output by the battery 30 into a first alternating current and a second alternating current when no commercial power is supplied; and when the mains supply is connected, rectifying the alternating current output by the mains supply and outputting the rectified alternating current to the battery 30 so as to charge the battery 30.
It can be understood that the existing mobile power supply and home power supply can only realize single-mains input single-voltage output, and cannot realize single-mains input double-voltage inversion output. In order to overcome the above disadvantages, the present invention is implemented by providing an inverter circuit 20 for inverting the dc power of a battery 30 into ac power or rectifying the ac power of a utility power into dc power, wherein when the first utility power end L and the second utility power end N of a power supply system are connected with the utility power, a utility power switch circuit 10 turns on a path between the utility power end and the inverter circuit 20 to turn on a path between the first utility power end L and the inverter circuit 20, and between the second utility power end N and the inverter circuit 20, and the inverter circuit 20 rectifies the ac power of the first utility power end L and the ac power of the second utility power end N into dc power and outputs the dc power to the battery 30, thereby realizing the effect of dual utility power input; when the first utility power end L and the second utility power end N of the power supply system are not connected to the utility power, the utility power switch circuit 10 cuts off the path between the utility power end and the inverter circuit 20, so as to cut off the path between the utility power end and the inverter circuit 20, and between the second utility power end N and the inverter circuit 20, and the inverter circuit 20 inverts the direct current of the battery 30 into the first alternating current and the second alternating current, and outputs the first alternating current through the first end and the second alternating current through the second end, thereby realizing the effect of dual-voltage inversion output. In summary, the present invention realizes the effect of dual-mains input and dual-voltage inversion output through the ac/dc conversion of the inverter circuit 20.
Alternatively, the inverter circuit 20 may be implemented by an L-type three-level bridge arm circuit and a T-type three-level bridge arm circuit, and the inverter circuit 20 in this embodiment is illustrated by using two independent T-type three-level bridge arm circuits as an example. The PWM pulse waves output by the two T-shaped three-level bridge arm circuits are 180 degrees different. Specifically, when no mains supply is connected and only the inversion work is performed, the voltage of the battery 30 is inverted through two T-shaped three-level bridge arm circuits to generate 2 alternating current sine waves, namely a first alternating current and a second alternating current, which are 180 degrees different from the middle bus, and the voltage difference between the 2 alternating current sine waves is 240Vac. It is to be understood that the intermediate bus refers to the first end of the inverter circuit 20, and the voltage of the intermediate bus is 120Vac. When the mains supply is connected into 120Vac voltage or 240Vac, the 120Vac voltage or 240Vac voltage is rectified to the positive electrode of the battery 30 and the negative electrode of the battery 30 through two T-shaped three-level bridge arm circuits so as to charge the battery 30;
the invention provides a double-line mains supply input split-phase output power supply system which comprises a battery 30, an inverter circuit 20 and a mains supply switch circuit 10; when no mains supply is connected to the power supply system, the mains supply switch circuit 10 disconnects the path between the first mains supply terminal L and the inverter circuit 20 and disconnects the path between the second mains supply terminal N and the inverter circuit 20. In the case where the inverter circuit 20 cannot receive the utility power, the voltage of the battery 30 is converted into the direct current to be converted into the first alternating current and the second alternating current, and the first alternating current is output to the load through the first terminal, and the second alternating current is output to another load through the second terminal. When the utility power is connected to the power supply system, the utility power switch circuit 10 turns on the path between the first utility power terminal L and the inverter circuit 20 and the path between the second utility power terminal N and the inverter circuit 20, so that the ac power output by the utility power is output to the inverter circuit 20. When the inverter circuit 20 receives the mains supply, the voltage of the mains supply is rectified to be dc, and the dc is output to the positive electrode of the battery 30 and the negative electrode of the battery 30 through the first power terminal and the second power terminal, respectively, so as to charge the battery 30. The invention performs AC/DC conversion on the commercial power and the battery 30 through the inverter circuit 20, thereby realizing the effect of double-commercial power input and double-voltage inversion output.
In an embodiment, referring to fig. 2 and 3, the dual-line mains input split phase output power supply system further includes:
a load switch circuit 40, wherein a first input end of the load switch circuit 40 is connected with a first end of the inverter circuit 20, a second input end of the load switch circuit 40 is connected with a second end of the inverter circuit 20, and a third input end of the load switch circuit 40 is connected with a third end of the inverter circuit 20; a first output end of the load switch circuit 40 is connected with a first load end N1, a second output end of the load switch circuit 40 is connected with a second load end L1, and a third output end of the load switch circuit 40 is connected with a third load end L2;
the load switch circuit 40 is configured to, when no mains supply is connected, turn on a path between the inverter circuit 20 and the second load terminal L1 and turn on a path between the inverter circuit 20 and the third load terminal L2, so that the first alternating current and the second alternating current are output to the second load and the third load through the second load terminal L1 and the third load terminal L2, so as to supply power to the second load and the third load; and when mains supply is connected, opening the path between the inverter circuit 20 and the second load end L1 and opening the path between the inverter circuit 20 and the third load end L2.
It can be understood that when no mains supply is connected, the mains switch circuit 10 is turned off, the load switch circuit 40 is turned on, and the path between the inverter circuit 20 and the second load terminal L1 and the path between the inverter circuit 20 and the third load terminal L2 are turned on, so that the first alternating current and the second alternating current output by the inverter circuit 20 are respectively output to the second load and the third load to supply power to the second load and the third load; when the mains supply is connected, the mains supply switch circuit 10 is turned on, the load switch circuit 40 is turned off, the path between the inverter circuit 20 and the second load terminal L1 is disconnected, and the path between the inverter circuit 20 and the third load terminal L2 is turned on, at this time, the inverter circuit 20 cannot output ac power to the load terminal, but rectifies the mains supply of the mains supply terminal into dc power to charge the battery 30.
In an embodiment, referring to fig. 3, when no mains supply is connected, the voltage of the first load terminal N1 and the voltage of the second load terminal L1 differ by a first preset voltage; the voltage of the second load end L1 is different from the voltage of the third load end L2 by a second preset voltage; the voltage of the first load terminal N1 is different from the voltage of the third load terminal L2 by a third preset voltage.
In this embodiment, when no mains is connected, the voltage of the battery 30 of 200V is inverted by 2 independent T-shaped three-level bridge arms into 2 ac sine waves 180 degrees different from the intermediate bus (120 Vac), and the voltage difference between the 2 ac sine waves is 240Vac. At this time, the mains switch circuit 10 is turned off, the load switch circuit 40 is turned on, and the phase difference between the first load end N1 and the second load end L1 is 120Vac; the first load terminal N1 and the third load terminal L2 differ by 120Vac; the second load terminal L1 and the third load terminal L2 differ by 240Vac, thereby realizing simultaneous output of 2 voltage specifications, 120Vac and 240Vac, respectively.
In an embodiment, referring to fig. 3, when the first mains supply is connected, the voltage of the first load terminal N1 and the voltage of the second load terminal L1 differ by a fourth preset voltage; the voltage of the second load end L1 differs from the voltage of the third load end L2 by a fifth preset voltage; the voltage of the first load terminal N1 is different from the voltage of the third load terminal L2 by a sixth preset voltage.
In this embodiment, when there is a mains input and the mains input is 120Vac, the mains switch circuit 10 is turned on, the load switch circuit 40 is turned off, and the first load terminal N1 and the second load terminal L1 differ by 120Vac; the first load terminal N1 and the third load terminal L2 differ by 120Vac; the second load terminal L1 and the third load terminal L2 differ by 0Vac, while the mains input of 120Vac can be rectified to the positive pole of the battery 30 and the negative pole of the battery 30 through two T-shaped three-level bridge arm circuits to charge the battery 30.
In an embodiment, referring to fig. 3, when the second mains supply is connected, the voltage of the first load terminal N1 is different from the voltage of the second load terminal L1 by a seventh preset voltage; the voltage of the second load end L1 differs from the voltage of the third load end L2 by an eighth preset voltage; the voltage of the first load terminal N1 is different from the voltage of the third load terminal L2 by a ninth preset voltage.
In this embodiment, when there is a mains input and the mains input is 240Vac, the mains switch circuit 10 is turned on, the load switch circuit 40 is turned off, and the first load terminal N1 and the second load terminal L1 differ by 0Vac; the first load terminal N1 and the third load terminal L2 differ by 0Vac; the second load terminal L1 and the third load terminal L2 differ by 240Vac, and at the same time, the mains input of 240Vac can be rectified to the positive electrode of the battery 30 and the negative electrode of the battery 30 through two T-shaped three-level bridge arm circuits to charge the battery 30.
In an embodiment, referring to fig. 2 and 3, the inverter circuit 20 includes a first three-level bridge arm circuit and a second three-level bridge arm circuit; the middle end mid_bus of the first three-level bridge arm circuit and the middle end mid_bus of the second three-level bridge arm circuit are both third ends of the inverter circuit 20; the output end of the first three-level bridge arm circuit is a first end of the inverter circuit 20, and the output ends of the three-level bridge arm circuits are all second ends of the inverter circuit 20.
In this embodiment, the PWM pulse waves output by the two T-type three-level bridge arm circuits are 180 degrees different. Specifically, when no mains supply is connected and only the inversion works, the voltage of the battery 30 is inverted by two T-type three-level bridge arm circuits to generate 2 ac sine waves which are 180 degrees different from the middle end mid_bus, and the voltage difference between the 2 ac sine waves is 240Vac. It should be understood that the intermediate terminal mid_bus refers to the first terminal of the inverter circuit 20, and the voltage of the intermediate terminal mid_bus is 120Vac. When the mains supply is connected to 120Vac voltage or 240Vac, the 120Vac voltage or 240Vac voltage is rectified to the positive electrode of the battery 30 and the negative electrode of the battery 30 through two T-shaped three-level bridge arm circuits to charge the battery 30.
In an embodiment, referring to fig. 2 and 3, the load switching circuit 40 includes a fourth relay RY4, a fifth relay RY5, a sixth relay RY6, and a seventh relay RY7;
the first end of the fourth relay RY4 is connected to the first load end N1, the first end of the fifth relay RY5 is connected to the second load end L1, and the first end of the seventh relay RY7 is connected to the third load end L2 and the first end of the sixth relay RY6, respectively;
the second end of the fourth relay RY4 is connected to the third end of the inverter circuit 20, the second end of the fifth relay RY5 is connected to the first end of the inverter circuit 20 and the second end of the sixth relay RY6, respectively, and the second ends of the seventh relay RY7 are connected to the second end of the inverter circuit 20.
The commercial power switching circuit 10 includes a first relay RY1, a second relay RY2, and a third relay RY3;
the first end of the first relay RY1 is connected with a first mains supply end L, and the first end of the second relay RY2 and the first end of the third relay RY3 are connected with a second mains supply end N;
the second end of the first relay RY1 is connected to the first end of the inverter circuit 20, the second end of the second relay RY2 is connected to the second end of the inverter circuit 20, and the second end of the third relay RY3 is connected to the first end of the fourth relay RY 4.
In the first embodiment, when no commercial power is supplied, the first relay RY1, the second relay RY2, the third relay RY3, and the sixth relay RY6 are turned off; the fourth relay RY4, the fifth relay RY5, and the seventh relay RY7 are turned on. The voltage of the battery 30 with 200V is inverted into 2 alternating current sine waves through 2 independent T-shaped three-level bridge arms, and the 2 alternating current sine waves are output to the second load end L1 and the third load end L2 through a fifth relay RY5 and a seventh relay RY7 respectively.
In the second embodiment, when the commercial power is input and the commercial power input is 120Vac, the first relay RY1, the second relay RY2, the third relay RY3, the fifth relay RY5 and the sixth relay RY6 are turned on; the fourth relay RY4 and the seventh relay RY7 are opened. The commercial power of 120Vac is input to two T-type three-level bridge arm circuits through the first relay RY1, the second relay RY2 and the third relay RY3, respectively, so that the two T-type three-level bridge arm circuits rectify 120Vac to the positive electrode of the battery 30 and the negative electrode of the battery 30 to charge the battery 30.
In the third embodiment, when the commercial power is input and the commercial power is input to 240Vac, the first relay RY1, the second relay RY2, the third relay RY3, the fifth relay RY5 and the sixth relay RY6 are turned on; the fourth relay RY4 and the seventh relay RY7 are opened. The commercial power of 240Vac is input to two T-type three-level bridge arm circuits through the first relay RY1, the second relay RY2, and the third relay RY3, respectively, so that the two T-type three-level bridge arm circuits rectify 120Vac to the positive electrode of the battery 30 and the negative electrode of the battery 30 to charge the battery 30.
In one embodiment, a first input terminal of the current detection circuit is connected to the second output terminal of the load switch circuit 40, and a second input terminal of the current detection circuit is connected to the third output terminal of the load switch circuit 40;
the current detection circuit is used for detecting the current of the first alternating current and the current of the second alternating current and outputting the detection result to the display circuit.
It can be understood that the current detection circuit is implemented by a current detection chip, and is configured to detect a current at the load end and output a current signal to the display circuit. The display circuit comprises a display and a controller, the controller controls the display to display corresponding current parameters according to current signals, and a user can monitor the current of the load end according to the displayed current parameters.
The foregoing description is only of the optional embodiments of the present invention, and is not intended to limit the scope of the invention, and all the equivalent structural changes made by the description of the present invention and the accompanying drawings or the direct/indirect application in other related technical fields are included in the scope of the invention.
Claims (9)
1. The utility model provides a two line commercial power input split phase output power supply system which characterized in that includes:
a battery;
an inverter circuit;
the first input end of the mains supply switch circuit is connected with a first mains supply end, the second input end of the mains supply switch circuit and the third input end of the mains supply switch circuit are connected with a second mains supply end, the first output end of the mains supply switch circuit is connected with the first end of the inverter circuit, the second output end of the mains supply switch circuit is connected with the second end of the inverter circuit, and the third output end of the mains supply switch circuit is connected with the third end of the inverter circuit; the mains supply switch circuit is used for disconnecting the passage between the first mains supply end and the inverter circuit and disconnecting the passage between the second mains supply end and the inverter circuit when no mains supply is connected; when mains supply is connected, a passage between a first mains supply end and the inverter circuit is conducted, and a passage between a second mains supply end and the inverter circuit is conducted, so that alternating current output by the mains supply is output to the inverter circuit;
the first power end of the inverter circuit is connected with the positive electrode of the battery, and the second power end of the inverter circuit is connected with the negative electrode of the battery; the inverter circuit can invert the direct current output by the battery into first alternating current and second alternating current when no commercial power is connected; and when the commercial power is connected, rectifying the alternating current output by the commercial power and outputting the rectified alternating current to the battery so as to charge the battery.
2. The two-wire mains input split phase output power supply system of claim 1, further comprising:
the first input end of the load switch circuit is connected with the first end of the inverter circuit, the second input end of the load switch circuit is connected with the second end of the inverter circuit, and the third input end of the load switch circuit is connected with the third end of the inverter circuit; the first output end of the load switch circuit is connected with the first load end, the second output end of the load switch circuit is connected with the second load end, and the third output end of the load switch circuit is connected with the third load end;
the load switch circuit is used for conducting a passage between the inverter circuit and the second load end and a passage between the inverter circuit and the third load end when no commercial power is connected, so that the first alternating current and the second alternating current are output to the second load and the third load through the second load end and the third load end to supply power for the second load and the third load; and when mains supply is connected, disconnecting the path between the inverter circuit and the second load end and disconnecting the path between the inverter circuit and the third load end.
3. The two-wire mains input split phase output power supply system according to claim 2, wherein,
when no mains supply is connected, the voltage of the first load end is different from the voltage of the second load end by a first preset voltage; the voltage of the second load end is different from the voltage of the third load end by a second preset voltage; the voltage of the first load end is different from the voltage of the third load end by a third preset voltage.
4. The two-wire mains input split phase output power supply system according to claim 2, wherein,
when a first commercial power is connected, the voltage of the first load end is different from the voltage of the second load end by a fourth preset voltage; the voltage of the second load end is different from the voltage of the third load end by a fifth preset voltage; the voltage of the first load end is different from the voltage of the third load end by a sixth preset voltage.
5. The two-wire mains input split phase output power supply system according to claim 2, wherein,
when a second commercial power is connected, the voltage of the first load end is different from the voltage of the second load end by a seventh preset voltage; the voltage of the second load end is different from the voltage of the third load end by an eighth preset voltage; the voltage of the first load end is different from the voltage of the third load end by a ninth preset voltage.
6. The two-wire mains input split phase output power supply system of claim 1, wherein the inverter circuit comprises a first three-level bridge arm circuit and a second three-level bridge arm circuit;
the middle end of the first three-level bridge arm circuit and the middle end of the second three-level bridge arm circuit are all third ends of the inverter circuit; the output end of the first three-level bridge arm circuit is the first end of the inverter circuit, and the output ends of the three-level bridge arm circuits are both the second ends of the inverter circuit.
7. The two-wire mains input split phase output power supply system of claim 2, wherein the load switch circuit comprises a fourth relay, a fifth relay, a sixth relay, and a seventh relay;
the first end of the fourth relay is connected with a first load end, the first end of the fifth relay is connected with a second load end, and the first end of the seventh relay is respectively connected with a third load end and the first end of the sixth relay;
the second end of the fourth relay is connected with the third end of the inverter circuit, the second end of the fifth relay is respectively connected with the first end of the inverter circuit and the second end of the sixth relay, and the second ends of the seventh relay are connected with the second end of the inverter circuit.
8. The two-wire mains input split phase output power supply system of claim 7, wherein the mains switch circuit comprises a first relay, a second relay, and a third relay;
the first end of the first relay is connected with a first mains supply end, and the first end of the second relay and the first end of the third relay are connected with a second mains supply end;
the second end of the first relay is connected with the first end of the inverter circuit, the second end of the second relay is connected with the second end of the inverter circuit, and the second end of the third relay is connected with the first end of the fourth relay.
9. The two-wire mains input split phase output power supply system of claim 2, further comprising:
the first input end of the current detection circuit is connected with the second output end of the load switch circuit, and the second input end of the current detection circuit is connected with the third output end of the load switch circuit;
the current detection circuit is used for detecting the current of the first alternating current and the current of the second alternating current and outputting the detection result to the display circuit.
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