Circuit of bidirectional direct-current power supply

Abstract

The utility model relates to the technical field of power supply management, and discloses a circuit of a bidirectional direct current power supply, which comprises m input ends, m first loops, n output ends and k switches, the output ends comprise m first loop output ends and n-m second loop output ends, the switches comprise m first loop switches and k-m second loop switches, the m input ends are mutually connected in parallel, the number of k and the number of n are both larger than m, k, n and m are all natural numbers larger than 1, the m input ends are provided with m first loop switches and m first loop output ends which correspond to one another, any input end is connected with the corresponding first loop switch and the first loop output end in series to form a first loop, the m first loops are connected in parallel, and the m first loops are connected in parallel. K-m switches and n-m output ends are arranged among the m first loops, and when the switches except the switches of the first loops are closed, two or more first loops are mutually connected in parallel to any second loop output end to form a second loop.

Description

TECHNICAL FIELD

[0001] The utility model relates to power management technical field especially relates to a circuit of bidirectional DC power supply. BACKGROUND

[0002] Bidirectional DC power supply is a kind of power supply that can convert AC input voltage into DC voltage output by electronic device, and can realize bidirectional electric power transmission. Power supply can charge-discharge for various voltage grade large-capacity energy storage battery system, and is widely used in electric car, subway, photovoltaic, electric vehicle charging, battery simulator, electric vehicle motor electric control test system and other fields. It can also provide DC power for high-power DC / AC frequency conversion traditional system, and mechanical energy is converted into electric energy when braking in transmission system, and energy is fed back to power grid through bidirectional DC power supply.

[0003] At present, in the existing bidirectional DC power supply, the traditional multi-channel parallel design usually cannot effectively match multiple small power loads (such as batteries), when different characteristic loads are connected at the same time, due to the same output parameters of each channel, some loads may not get enough current, while other loads may be damaged due to overload, this situation is especially common in practical application, causing the efficiency of equipment to be reduced and the safety hazard to be increased, at the same time, the design of bidirectional DC power supply mostly adopts multi-channel input, but these channels are usually simply connected in parallel to an output port, such design can meet the basic demand of high-power output to a certain extent, but the traditional parallel design often cannot realize independent control of each input, resulting in that bidirectional DC power supply cannot cope with different load demands. SUMMARY

[0004] The technical problem to be solved by the utility model is to solve the problem that the existing bidirectional DC power supply has few circuit output ports and each input end cannot be simultaneously and independently output.

[0005] In order to solve the above technical problem, a circuit of bidirectional DC power supply, the circuit of bidirectional DC power supply includes:

[0006] m input terminals, m first loops, n output terminals, k switches, the output terminals including m first loop output terminals and n-m second loop output terminals, the switches including m first loop switches and k-m second loop switches, the m input terminals being connected in parallel with each other, wherein the number of k and n are both greater than m, k, n and m are all natural numbers greater than 1, the m input terminals are provided with corresponding m first loop switches and m first loop output terminals, wherein any of the input terminals and its corresponding first loop switch and first loop output terminal are connected in series to form the first loop, the m first loops are connected in parallel with each other, and k-m switches are arranged between the m first loops, n-m output terminals, when any switch other than the first loop switch is closed, two or more first loops are connected in parallel to any second loop output terminal to form a second loop.

[0007] Further, a fuse is arranged in each of the first loops.

[0008] Further, a switch Q is arranged in front of each of the first loop output terminals.

[0009] Further, m is equal to 4, n is equal to 7, and k is equal to 7, the four first loops are first loop A, first loop B, first loop C and first loop D respectively, when the first loop switches are closed and the second loop switches are open, the four first loops run independently and output, and when all the switches are closed, the four first loops are connected in parallel to one output terminal.

[0010] Further, m is equal to 6, n is equal to 10, and k is equal to 11, when the first loop switches are closed and the second loop switches are open, the six first loops run independently and output, and when all the switches are closed, the six first loops are connected in parallel to one output terminal.

[0011] Further, the four input terminals are in1, in2, in3, in4, the seven switches are S1, S2, S3, S4, S5, S6, S7, the seven output terminals are OUT1, OUT2, OUT3, OUT4, OUT5, OUT6, OUT7, the in1, the S1 and the OUT1 are connected in series to form a first loop A, the in2, the S2 and the OUT2 are connected in series to form a first loop B, the in3, the S3 and the OUT3 are connected in series to form a first loop C, the in4, the S4 and the OUT4 are connected in series to form a first loop D, the first loops are connected in parallel with each other, the S5 is located between the first loop A and the first loop B, the S6 is located between the first loop C and the first loop D, the S7 is located between the first loop B and the first loop C, when the S1, the S2, the S3 and the S4 are closed, and the S5, the S6 and the S7 are disconnected, the first loop A, the first loop B, the first loop C and the first loop D are independently output through the respective output terminals OUT1, OUT2, OUT3 and OUT4, and the output power is the power of the respective input terminals in1, in2, in3 and in4.

[0012] Further, when the S1, the S2, the S3, the S4 and the S5 are closed, and the S6 and the S7 are disconnected, the first loop A and the first loop B are connected in parallel to the OUT5 to form a second loop A, the input power of the second loop A is the total power of in1 and in2, and the output terminal is OUT5, and the OUT3, the OUT4 and the OUT5 of the circuit output the power of the respective input terminals.

[0013] Further, when the S1, the S2, the S3, the S4 and the S6 are closed, and the S5 and the S7 are disconnected, the first loop C and the first loop D are connected in parallel to the OUT6 to form a second loop B, the input power of the second loop B is the total power of in3 and in4, and the output terminal is OUT6, and the OUT1, the OUT2 and the OUT6 of the circuit output the power of the respective input terminals.

[0014] Further, when the S1, the S2, the S3, the S4, the S5 and the S6 are closed, and the S7 is disconnected, the first loop A and the first loop B are connected in parallel to the OUT5 to form a second loop A, the input power of the second loop A is the total power of in1 and in2, and the output terminal is OUT5, the first loop C and the first loop D are connected in parallel to the OUT6 to form a second loop B, the input power of the second loop B is the total power of in3 and in4, and the output terminal is OUT6, and the OUT5 and the OUT6 of the circuit output the power of the respective input terminals.

[0015] Further, when the S1, S2, S3, S4, S5, S6, S7 are closed, the first circuit A, the first circuit B, the first circuit C and the first circuit D are connected in parallel to the OUT7, and a second circuit D is formed, the input power of the second circuit D is the total power of the in1, in2, in3 and in4, and the output is the OUT7, and the OUT7 of the circuit is independently output.

[0016] Compared with the prior art, the circuit of the bidirectional direct current power supply provided in the embodiment of the utility model has the beneficial effects that:

[0017] The circuit of the bidirectional direct current power supply in the prior art is designed to connect multiple input ends to different output ends for output in the embodiment of the utility model, when multiple low-power loads are charged at the same time, the staff only needs to connect the loads to different output ports to complete the charging, and when a higher-power load is charged, the staff only needs to control the switch in the circuit of the bidirectional direct current power supply, so that the multiple input ends are connected in parallel to one input end at the same time, and meanwhile, the output ends that are not connected in parallel can also be independently output, thereby meeting the requirements of different working conditions and ensuring the multitasking processing capability of the circuit of the bidirectional direct current power supply. The utility model effectively solves the problems of insufficient number of output ports and the inability of the multiple input ends to be independently output at the same time in the circuit of the existing bidirectional direct current power supply, and provides the circuit of the bidirectional direct current power supply that can adapt to different scene requirements. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 is a circuit diagram of the circuit of the bidirectional direct current power supply provided in the embodiment of the utility model;

[0019] Figure 2 is a circuit diagram of a first circuit in the circuit of the bidirectional direct current power supply provided in the embodiment of the utility model;

[0020] Figure 3 is a circuit diagram of a second circuit in the circuit of the bidirectional direct current power supply provided in the embodiment of the utility model;

[0021] Figure 4 is a circuit diagram of the circuit of the bidirectional direct current power supply provided in another embodiment of the utility model;

[0022] Figure 5 is a circuit diagram of the circuit of the bidirectional direct current power supply provided in another embodiment of the utility model;

[0023] Figure 6 is a circuit diagram provided in the embodiment of the utility model and having the switch Q;

[0024] Figure 7Another circuit diagram of the circuit of the bidirectional DC power supply is provided by the embodiment of the utility model. DETAILED DESCRIPTION

[0025] The specific embodiments of the utility model will be further described in detail below in combination with the drawings and examples. The following examples are used to illustrate the utility model, but are not used to limit the scope of the utility model. It should be noted that: the relative arrangement, numerical value of the components and steps set forth in these examples do not limit the scope of the utility model unless otherwise specifically stated.

[0026] The following description of at least one exemplary embodiment is merely exemplary in nature and is in no way intended to limit the utility model and its application or uses.

[0027] The technology, method and equipment known to those skilled in the relevant art can not be discussed in detail, but in appropriate cases, the technology, method and equipment should be regarded as part of the specification.

[0028] In all examples shown and discussed here, any specific value should be interpreted as merely exemplary, not as a limitation. Therefore, other examples of exemplary embodiments can have different values.

[0029] It should be noted that: similar signs and letters represent similar items in the following drawings, therefore, once an item is defined in one drawing, it does not need to be further discussed in the subsequent drawings.

[0030] As Figure 1 , Figure 2 and Figure 3 shown, in an optional embodiment of the utility model, the circuit of the bidirectional DC power supply comprises:

[0031] m input terminals, m first loops, n output terminals, k switches, the output terminals comprise m first loop output terminals and n-m second loop output terminals, the switches comprise m first loop switches and k-m second loop switches, the m input terminals are connected in parallel with each other, wherein, the number of k and n are both greater than m, k, n and m are all natural numbers greater than 1, the m input terminals are provided with m first loop switches and m first loop output terminals corresponding to each other, wherein, any input terminal and its corresponding first loop switch and first loop output terminal are connected in series to form a first loop, the m first loops are connected in parallel with each other, k-m switches are arranged between the m first loops, n-m output terminals, when any switch other than the first loop switch is closed, two or more first loops are connected in parallel to any second loop output terminal to form a second loop.

[0032] The connection sequence of the entire bidirectional DC power supply during operation is: power grid→AC / DC rectifying unit of the bidirectional DC power supply→DC / DC bidirectional DC inverter unit→the circuit of the bidirectional DC power supply of the patent→battery and the like load, the input end of the circuit of the bidirectional DC power supply is connected with the DC / DC bidirectional DC inverter unit of the bidirectional DC power supply, which is direct current (can charge the battery or discharge the battery), the output end of the bidirectional DC power supply refers to the port for providing power output for the battery and the like load, and the output end of the circuit of the bidirectional DC power supply is connected with the battery and the like load; the first loop refers to a loop capable of realizing independent output, the first loop is composed of one switch corresponding thereto, one input end and one output end, the first loop output end refers to the output end corresponding to the first loop, and the first loop switch refers to the switch corresponding to the first loop; the second loop refers to a new loop formed by connecting two or more first loop output ends to the second loop output end in parallel through the closing relationship of the switch, the power of the input end of the second loop is the total power of the first loop output ends connected in parallel, the second loop output end refers to an output end other than the first loop output end, and the second loop switch refers to a switch other than the first loop switch; Figure 1 The input end is in, the output end is OUT, and the switch is S, Figure 2 represents one of the first loops, in1, S1 and OUT1 are connected in series to form a first loop, S1 here is the first loop switch, and OUT1 here is the first loop output end; Figure 3 represents one of the second loops, by closing the switch S5, the first loop formed by connecting in1, S1 and OUT1 in series and the first loop formed by connecting in2, S2 and OUT2 in series are connected in parallel to OUT5 to form the second loop, the power output by the second loop OUT5 is the power of in1+in2, S1 and S2 here are the first loop switches, S5 is the second loop switch, OUT1 and OUT2 here are the first loop output ends, and OUT5 is the second loop output end.

[0033] Specifically, in actual application, the multiple first loop input ends can be connected to alternating current with relatively low power, so as to provide output for low-power loads, and the multiple first loops can effectively supply power to multiple low-power loads at the same time; when supplying power to high-power loads, the multiple first loops can be connected in parallel to an output end of a second loop, which not only can improve the power supply capacity, but also can realize flexible configuration of the loads. For high-power loads, a single power supply output may not be able to meet the current demand thereof, by connecting the multiple first loops in parallel to an output end to form a second loop, the powers of the first loops can be added to form an output capable of supporting high-power loads, and meanwhile, the first loops not connected can also independently output.

[0034] The utility model discloses a circuit design of the bidirectional direct current power supply of the multiple input ends interconnection parallel connection simultaneously access one output end in prior art to the load output is formed into the circuit of the bidirectional direct current power supply of the multiple input ends interconnection parallel connection access different output end output, when charging the multiple low power load simultaneously, the staff only needs to access the different output port of load just can complete, and when charging the higher power load, the staff only needs to control the switch in the circuit of the bidirectional direct current power supply, makes multiple input ends parallel connection simultaneously access one output end, simultaneously, the input end that does not parallel connection can also carry out independent output, thereby reaches the requirement of adaptation different working condition, ensures the multi -task processing capacity of the circuit of the bidirectional direct current power supply, the utility model effectively solved the problem of the insufficient output port quantity and each input end cannot simultaneous independent output in the circuit of the bidirectional direct current power supply of prior art, provided the circuit of the bidirectional direct current power supply that can adapt to different scene demand.

[0035] As Figure 5 Indicated, in an optional embodiment of the utility model, a fuse is arranged in each first loop.

[0036] The fuse FU is a basic circuit protection device that melts to disconnect the circuit when the current is too large, protecting the device from damage. The fuse FU can provide overload protection for the circuit. When the current exceeds the rated value of the fuse, the fuse wire will melt due to overheating, thereby cutting off the circuit and preventing the circuit and device from being damaged by overload. The fuse FU can provide short-circuit protection for the circuit. In the event of a short circuit, the current increases sharply, and the fuse can respond quickly to melt in time, preventing the circuit and device from being damaged more severely. By arranging a fuse in each first loop, the circuit can be disconnected in time in the event of an abnormal situation, preventing the spread of faults and protecting the safety of other loops and devices. If a first loop fails due to excessive load, the fuse will quickly melt to disconnect the power supply of the loop, while the other loops can still work normally, thereby ensuring the stability of the entire circuit.

[0037] As Figure 6 Indicated, in an optional embodiment of the utility model, a switch Q is arranged before each first loop output.

[0038] Specifically, through the switch Q, independent control of each first loop output can be realized. This means that even if multiple input ends are connected together, the output of a certain first loop can be selectively turned on or off as needed. After adding the switch Q, the configuration of the output circuit of a certain first loop can be selectively connected or disconnected according to actual application requirements, making the configuration more flexible to meet different output requirements. In some cases, when a certain first loop fails or needs maintenance, the output of the loop can be disconnected by turning off the corresponding switch Q, thereby ensuring the safe operation of the circuit.

[0039] As Figure 4 shown in an optional embodiment of the utility model, m is equal to 4, n is equal to 7, k is equal to 7, 4 the first circuit is first circuit A, first circuit B, first circuit C, first circuit D respectively, when the first circuit switch is closed, the second circuit switch is opened, 4 the first circuit is operated alone and exports, when all switches are closed, 4 the first circuit is parallel to an output terminal.

[0040] Wherein, m is equal to 4 indicates that there are 4 input terminals, n is equal to 7 indicates that there are 7 output terminals, k is equal to 7 indicates that there are 7 switches, first circuit A is formed by its corresponding input terminal i n1, output terminal OUT1 and switch S1, closes S1 and disconnects the switch S5, S7 connecting first circuit A with other circuits, first circuit A can export alone, the power of output terminal OUT1 of first circuit A is the power of i n1;First circuit B is formed by its corresponding input terminal i n2, output terminal OUT2 and switch S2, closes S2 and disconnects the switch S5 connecting first circuit B with other circuits, first circuit B can export alone, the power of output terminal OUT2 of first circuit B is the power of i n2;First circuit C is formed by its corresponding input terminal i n3, output terminal OUT3 and switch S3, closes S3 and disconnects the switch S6, S7 connecting first circuit C with other circuits, first circuit C can export alone, the output power of output terminal OUT3 of first circuit C is the power of i n3;First circuit D is formed by its corresponding input terminal i n4, output terminal OUT4 and switch S4, closes S4 and disconnects the switch S6 connecting first circuit D with other circuits, first circuit D can export alone, the power of output terminal OUT4 of first circuit D is the power of i n4. When all switches are closed, first circuit A, first circuit B, first circuit C and first circuit are parallel to output terminal OUT7 simultaneously, the output power of output terminal OUT7 is the total power of i n1+i n2+i n3+i n4 at this time.

[0041] In the embodiment of the utility model, through the on-off of control switch, the circuit of 4 input ends constitutes 7 output ends, through effective utilization of multiple input ports and output to multiple output ends, the circuit can maximize the utilization of limited input end output to output end of different power, also avoid unnecessary power waste, the circuit of the direct current power supply can define output point is to charge battery or discharge battery, then record relevant working condition to judge the quality or effect of battery, one end of the circuit is connected with the electricity discharged by battery, the other end charges the connected load, if the charging and discharging current of both ends is same, then it is not necessary to use the power of power grid additionally (no additional electricity fee or only use very little), if the charging and discharging current of both ends is not same, the charging current is less than the discharging current, the discharged electricity is partially used for charging, if not enough, then take the electricity of power grid, if the discharging is greater than charging, the discharged electricity is used for charging, then surplus electricity is generated, if the power grid allows, then feedback to power grid, if the power grid does not allow, then use other device to consume in situ.

[0042] As shown in Figure 4 In an optional embodiment of the utility model, when S1, S2, S3, S4, S5 are closed, and S6, S7 are disconnected, the first loop A and the first loop B are connected in parallel to OUT5, forming a second loop A, the input power of the second loop A is the total power of in1 and in2, and the output end is OUT5, and the OUT3, OUT4 and OUT5 of the circuit output the power of the respective input ends.

[0043] The second loop A refers to the parallel connection of the first loop A and the first loop B to form a new circuit, the input power of the second loop A is provided by the total power of the input sources in1 and in2, and the output end is OUT5, ensuring effective distribution and utilization of power, and by effectively combining the total power of in1 and in2, the second loop A can provide the required power support for OUT5. At this time, the output ports of OUT3, OUT4 and OUT5 will independently obtain power from the input end respectively, and each output port of the bidirectional direct current power supply can supply power according to its specific requirements, and when in1 and in2 two input ends work simultaneously, the total power that can be output is much larger than the capacity of a single input end.

[0044] The embodiment of the utility model realizes the parallel connection of the first loop A and the first loop B by reasonable switch control, forms a second loop A, and effectively integrates the power of the input end. The design not only improves the flexibility and energy utilization efficiency of the system, but also simplifies the maintenance and troubleshooting process. Through reasonable power distribution and management, the circuit can meet the power demand of the load in different application scenarios, and improve the adaptability of the bidirectional direct current power supply.

[0045] As shown in Figure 4As shown, in an optional embodiment of this utility model, when S1, S2, S3, S4, S5, and S6 are closed and S7 is open, the first circuit A and the first circuit B are connected in parallel to OUT5 to form the second circuit A. The input power of the second circuit A is the total power of in1 and in2, and the output is OUT5. The first circuit C and the first circuit D are connected in parallel to OUT6 to form the second circuit B. The input power of the second circuit B is the total power of in3 and in4, and the output is OUT6. The circuit outputs the power of its respective input terminals at OUT5 and OUT6.

[0046] In the second circuit A, the first circuit A and the first circuit B are connected in parallel, so that the two circuits can share the power demand of the output terminal OUT5. At this time, the power of the input terminal is the sum of in1 and in2. Similarly, the parallel connection of the first circuit C and the first circuit D constitutes the second circuit B. At this time, the power of the input terminal of the second circuit B is the total power of in3 and in4.

[0047] This utility model embodiment provides two second circuits, namely second circuit A and second circuit B. The output power of these two circuits is added by the input terminals of the two first circuits, allowing multiple second circuits to output to the load, thereby improving the adaptability of the bidirectional DC power supply.

[0048] like Figure 4 As shown, in an optional embodiment of this utility model, when S1, S2, S3, S4, S5, and S7 are closed and S6 is open, the first circuit A, the first circuit B, and the first circuit C are connected in parallel to OUT7 to form the second circuit C. The input power of the second circuit C is the total power of in1, in2, and in3, and the output is OUT7. The circuit outputs the power of their respective inputs at OUT7 and OUT4.

[0049] The second circuit C is connected in parallel with the first circuits A, B, and C, forming a centralized output terminal OUT7. At this time, the input power of the circuit is the total power of in1, in2, and in3.

[0050] This embodiment of the invention ensures sufficient power support when dealing with large power loads by connecting the power of three first circuits in parallel and superimposing them. Furthermore, the first circuit D can also output independently, increasing the coordination of the bidirectional DC power supply circuit.

[0051] like Figure 4As shown in the utility model of an optional embodiment, when the S1, S2, S3, S4, S5, S6, S7 is closed, the first loop A, the first loop B, the first loop C and the first loop D are parallel to the OUT7, and constitute the second loop D, the input end power of the second loop D is the total power of i n1, i n2, i n3 and i n4, and the output end is OUT7, and the OUT7 of the circuit is single output.

[0052] Wherein, the second loop D is the circuit that all first loops are parallel to the OUT7, and the output power of the OUT7 as the output end of the second loop D is the total power of i n1, i n2, i n3 and i n4, at this time, the circuit of the bidirectional direct current power supply provides the maximum output power for load, and at this time, only the OUT7 is output as the output end.

[0053] In the embodiment of the utility model, all first loops are parallel to an output end for output, and the maximum output power of the circuit of the double direct current power supply is increased, and effective output is provided for high-power load.

[0054] As Figure 7 As shown in the utility model of an optional embodiment, m is equal to 6, n is equal to 10, and k is equal to 11, when the first loop switch is closed and the second loop switch is opened, the six first loops are independently operated and output, and when all switches are closed, the six first loops are parallel to an output end.

[0055] Wherein, the embodiment has multiple working conditions, for example, working condition 1: when all switches S1-S6 are not closed, all output points do not work; working condition 2: when S1-S6 are closed and other switches are not closed, OUT1-OUT6 are independently operated, and the output power is the power of the respective output end; working condition 3: when S1, S2 and S7 are closed, the input power of i n1 and i n2 is combined to the output OUT7, and the output power of OUT7 is the sum of the power of i n1 and i n2; working condition 4: when S3, S4 and S8 are closed, the input power of i n3 and i n4 is combined to the output OUT8, and the output power of OUT8 is the sum of the power of i n3 and i n4; working condition 5: when S1-S11 are closed, the input power of i n1-i n6 is combined to the output OUT10, and the output power of OUT10 is the sum of the power of i n1-i n6; other multiple working conditions can also be generated in the circuit of the bidirectional direct current circuit, and are not described one by one.

[0056] In the embodiment of the utility model, different switch combinations can be controlled to realize multiple working conditions and meet different power output requirements.

[0057] The above merely is the preferred implementation form of the present application, and it should be noted that, for the ordinary skilled in the art, without departing from the technical principles of the present application, a number of improvements and substitutions can be made, and these improvements and substitutions should also be considered as the protection scope of the present application.

Claims

1. A circuit for a bidirectional DC power supply, characterized by The circuit of the bidirectional DC power supply comprises: m input terminals, m first loops, n output terminals, k switches, the output terminals comprising m first loop output terminals and n-m second loop output terminals, the switches comprising m first loop switches and k-m second loop switches, the m input terminals being connected in parallel with each other, wherein the number of k and n are both greater than m, k, n and m are all natural numbers greater than 1, the m input terminals are provided with m first loop switches and m first loop output terminals corresponding to each other, wherein any of the input terminals and the first loop switches and the first loop output terminals corresponding thereto are connected in series with each other to form the first loop, the m first loops are connected in parallel with each other, k-m switches are arranged between the m first loops, n-m output terminals, when any switch other than the first loop switch is closed, two or more first loops are connected in parallel with each other to any second loop output terminal to form a second loop.

2. The circuit of claim 1, wherein, A fuse is arranged in each of the first loops.

3. The circuit of claim 1, wherein, A switch Q is arranged before each of the first loop output terminals.

4. The circuit of claim 1, wherein, m is equal to 4, n is equal to 7, k is equal to 7, the 4 first loops are respectively first loop A, first loop B, first loop C and first loop D, when the first loop switches are closed and the second loop switches are opened, the 4 first loops are separately operated and output, and when all the switches are closed, the 4 first loops are connected in parallel to one output terminal.

5. The circuit of claim 1, wherein, m is equal to 6, n is equal to 10, k is equal to 11, when the first loop switches are closed and the second loop switches are opened, the 6 first loops are separately operated and output, and when all the switches are closed, the 6 first loops are connected in parallel to one output terminal.

6. The circuit of claim 4, wherein, The 4 input terminals are in1, in2, in3 and in4, the 7 switches are respectively S1, S2, S3, S4, S5, S6 and S7, the 7 output terminals are OUT1, OUT2, OUT3, OUT4, OUT5, OUT6 and OUT7, the in1, the S1 and the OUT1 are connected in series to form the first loop A, the in2, the S2 and the OUT2 are connected in series to form the first loop B, the in3, the S3 and the OUT3 are connected in series to form the first loop C, the in4, the S4 and the OUT4 are connected in series to form the first loop D, the first loops are connected in parallel with each other, the S5 is located between the first loop A and the first loop B, the S6 is located between the first loop C and the first loop D, and the S7 is located between the first loop B and the first loop C, when S1, S2, S3 and S4 are closed and S5, S6 and S7 are opened, the first loop A, the first loop B, the first loop C and the first loop D are separately output through the respective output terminals OUT1, OUT2, OUT3 and OUT4, and the output power is the power of the respective input terminals in1, in2, in3 and in4.

7. The circuit of claim 6, wherein, When the S1, S2, S3, S4, S5 are closed, and S6, S7 are disconnected, the first circuit A and the first circuit B are connected in parallel to OUT5, forming the second circuit A, the input power of the second circuit A is the total power of in1 and in2, and the output is OUT5, and the OUT3, OUT4, OUT5 of the circuit output the power of the respective input.

8. The circuit of claim 6, wherein, When the S1, S2, S3, S4, S6 are closed, and S5, S7 are disconnected, the first circuit C and the first circuit D are connected in parallel to OUT6, forming the second circuit B, the input power of the second circuit B is the total power of in3 and in4, and the output is OUT6, and the OUT1, OUT2, OUT6 of the circuit output the power of the respective input.

9. The circuit of claim 6, wherein, When the S1, S2, S3, S4, S5, S6 are closed, and S7 is disconnected, the first circuit A and the first circuit B are connected in parallel to OUT5, forming the second circuit A, the input power of the second circuit A is the total power of in1 and in2, and the output is OUT5, the first circuit C and the first circuit D are connected in parallel to OUT6, forming the second circuit B, the input power of the second circuit B is the total power of in3 and in4, and the output is OUT6, and the OUT5, OUT6 of the circuit output the power of the respective input.

10. The circuit of claim 6, wherein, When the S1, S2, S3, S4, S5, S6, S7 are closed, the first circuit A, the first circuit B, the first circuit C and the first circuit D are connected in parallel to OUT7, forming the second circuit D, the input power of the second circuit D is the total power of in1, in2, in3 and in4, and the output is OUT7, and the OUT7 of the circuit outputs alone.

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