Multifunctional generator set

Abstract

The utility model discloses a multifunctional generator set, which is characterized in that the output end of a motor unit 11 is respectively connected with the first input end of a bidirectional DC-DC unit 12 and the first input end of a bidirectional DC-AC unit 13, and the first output end of the bidirectional DC-DC unit 12 is connected with the first input end of a power management unit 14; the first output end of the power management unit 14 is connected with the charging end of the electric energy storage unit 15; the first output end of the bidirectional DC-AC unit 13 is connected with the AC output port; the second output end of the bidirectional DC-DC unit 12 is connected with the DC output port; and the control end of the bidirectional DC-DC unit 12 and the control end of the bidirectional DC-AC unit 13 are respectively connected with the control end of the MCU 17. The output end of the electric energy storage unit 15 is connected with the second input end of the power management unit 14, and the second output end of the power management unit 14 is connected with the second input end of the bidirectional DC-DC unit 12; and the second input end of the bidirectional DC-AC unit 13 is connected with the AC input port.

Description

Technical Field

[0001] This utility model relates to the field of generator technology, and in particular to a multifunctional generator set. Background Technology

[0002] In existing technologies, gasoline generator sets typically use a single engine to provide power output, which limits their size and power output, and results in short battery life and long charging times. Therefore, there is a need for a multi-functional generator set that can provide electricity from both an engine and a battery.

[0003] Chinese Patent (CN219018516U) discloses a hybrid electric power supply system, including an engine 1, a magneto 2, a main controller 3, a DC controller 4, and a battery pack power supply unit 5. The main controller 3 includes an AC-DC rectifier circuit 31 and a DC-AC inverter circuit 32. The DC controller 4 includes a DC-DC converter circuit 41 and a charging control circuit 42. The DC-AC inverter circuit 32 is used to convert the output of the AC-DC rectifier circuit 31 and / or the DC-DC converter circuit 41 into AC power as the AC output of the hybrid electric power supply system. The DC-DC converter circuit 41 is used to boost the DC voltage output from the battery pack power supply unit 5 and input it to the DC-AC inverter circuit 32. The charging control circuit 42 is used to step down the output of the AC-DC rectifier circuit 31 to charge the battery pack power supply unit 5. The DC-DC converter circuit 45 converts the DC power output from the DC-DC converter circuit 41 into DC power at a set voltage.

[0004] However, in the aforementioned patents, both the DC-AC inverter circuit 32 and the DC-DC converter circuit 41 are unidirectional, resulting in an excessive number of controllers and circuits required, which increases the cost. Utility Model Content

[0005] To address the issues of limited functionality and high cost in existing generator technologies, this invention proposes a multi-functional generator set.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] A multi-functional generator set includes a motor unit 11, an energy storage unit 15 and an MCU 17, and also includes a bidirectional DC-DC unit 12, a bidirectional DC-AC unit 13 and a power management unit 14.

[0008] The output terminal of the motor unit 11 is connected to the first input terminal of the bidirectional DC-DC unit 12 and the first input terminal of the bidirectional DC-AC unit 13, respectively. The first output terminal of the bidirectional DC-DC unit 12 is connected to the first input terminal of the power management unit 14, and the first output terminal of the power management unit 14 is connected to the charging terminal of the energy storage unit 15.

[0009] The first output terminal of the bidirectional DC-AC unit 13 is connected to the AC output port; the second output terminal of the bidirectional DC-DC unit 12 is connected to the DC output port; the control terminals of the bidirectional DC-DC unit 12 and the bidirectional DC-AC unit 13 are respectively connected to the control terminals of the MCU 17.

[0010] The output terminal of the energy storage unit 15 is connected to the second input terminal of the power management unit 14, and the second output terminal of the power management unit 14 is connected to the second input terminal of the bidirectional DC-DC unit 12.

[0011] The second input terminal of the bidirectional DC-AC unit 13 is connected to the AC input port.

[0012] Preferably, the motor unit 11 is provided with a three-phase rectifier circuit; the three-phase rectifier circuit is used to convert the AC power output by the generator into DC power.

[0013] Preferably, the energy storage unit 15 includes at least one battery.

[0014] Preferably, the system further includes a photovoltaic unit 16, the output of which is connected to the third input of the bidirectional DC-DC unit 12.

[0015] Preferably, the photovoltaic unit 16 is equipped with an MPPT controller.

[0016] Preferably, it further includes a reverse drag start unit 18; the input terminal of the reverse drag start unit 18 is connected to the third output terminal of the bidirectional DC-DC unit 12, and the output terminal of the reverse drag start unit 18 is connected to the motor unit 11.

[0017] Preferably, the specific structure of the bidirectional DC-DC unit 12 is as follows:

[0018] One end of the first switch is connected to one end of the first capacitor, the drain of the first switching transistor, and the drain of the third switching transistor, respectively; one end of the first switch is also connected to the other end of the first capacitor, the source of the second switching transistor, and the source of the fourth switching transistor; the source of the first switching transistor and the drain of the second switching transistor are connected in parallel to the first port on one side of the first transformer, and the source of the third switching transistor and the drain of the fourth switching transistor are connected in parallel to the second port on one side of the first transformer; the gates of the first switching transistor, the second switching transistor, the third switching transistor, and the fourth switching transistor are respectively connected to the control terminal of the MCU.

[0019] The first port on the other side of the first transformer is connected to one end of the first inductor, and the other end of the first inductor is connected to the emitter of the fifth switch and the collector of the sixth switch, respectively. The second port on the other side of the first transformer is connected to one end of the second capacitor, and the other end of the second capacitor is connected to the emitter of the seventh switch and the collector of the eighth switch, respectively. The collector of the fifth switch, the collector of the seventh switch, and one end of the third capacitor are connected in parallel and then connected to the output terminal of the motor unit.

[0020] The emitters of the sixth and eighth switching transistors are connected in parallel and then connected to the other end of the third capacitor.

[0021] The bases of the fifth, sixth, seventh, and eighth switching transistors are connected to the control terminals of the MCU.

[0022] Preferably, the specific structure of the bidirectional DC-AC unit 13 is as follows:

[0023] The collectors of the ninth and eleventh transistors and one end of the third capacitor are connected in parallel and then connected to the output terminal of the motor unit; the emitters of the thirteenth and twelfth transistors are connected in parallel and then connected to the other end of the third capacitor.

[0024] The emitter of the ninth transistor, the collector of the thirteenth transistor, and one end of the fourth capacitor are connected in parallel and then connected to one end of the second switch; the emitter of the eleventh transistor and the collector of the twelfth transistor are connected in parallel and then connected to one end of the second inductor; the other end of the second inductor and the other end of the fourth capacitor are connected in parallel and then connected to one end of the second switch.

[0025] The bases of the ninth, thirteenth, eleventh, and twelfth transistors are connected to the control terminals of the MCU.

[0026] Preferably, the first switch is a single-pole double-throw switch or a double-pole double-throw switch.

[0027] Preferably, the second switch is a single-pole double-throw switch or a double-pole double-throw switch.

[0028] In summary, by adopting the above technical solution, compared with the prior art, this utility model has at least the following beneficial effects:

[0029] Compared with existing generators, the circuit structure is simpler, thus reducing the size and saving costs;

[0030] It can use a combination of battery and generator output or output power alone, and the output power can be adjusted according to demand. The maximum output power is the sum of the power of the generator and the battery, which improves the running time.

[0031] When the battery (energy storage unit) has low power, a generator or photovoltaic unit can be used to charge the battery, thereby increasing the operating time. Attached image description:

[0032] Figure 1 This is a schematic diagram of a multi-functional generator set according to an exemplary embodiment of the present invention.

[0033] Figure 2 This is a schematic diagram of a specific circuit of a multifunctional generator set according to an exemplary embodiment of the present invention.

[0034] Figure 3 This is a schematic diagram showing the operating timing of the first, second, third, and fourth switching transistors according to an exemplary embodiment of the present invention.

[0035] Figure 4 This is a schematic diagram of the operating timing of the fifth, sixth, seventh, and eighth switching transistors according to an exemplary embodiment of the present invention.

[0036] Figure 5 This is a schematic diagram showing the working timing of the ninth and thirteenth stage transistors (Q10), the eleventh and thirteenth stage transistors, and the twelfth and thirteenth stage transistors in a specific circuit of a multifunctional generator set according to an exemplary embodiment of the present invention. Detailed Implementation

[0037] The present invention will be further described in detail below with reference to embodiments and specific implementation methods. However, it should not be construed as limiting the scope of the above-mentioned subject matter of the present invention to the following embodiments; all technologies implemented based on the content of the present invention fall within the scope of the present invention.

[0038] In the description of this utility model, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0039] In the description of this utility model, unless otherwise specified and limited, it should be noted that the terms "installation", "connection" and "linking" should be interpreted broadly. For example, they can refer to mechanical or electrical connections, or internal connections between two components. They can be direct connections or indirect connections through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms according to the specific circumstances.

[0040] like Figure 1 As shown, this application provides a multi-functional generator set, including a motor unit 11, a bidirectional DC-DC unit 12, a bidirectional DC-AC unit 13, a power management unit 14, an energy storage unit 15 (battery), and an MCU 17.

[0041] The output terminal of the motor unit 11 is connected to the first input terminal of the bidirectional DC-DC unit 12 and the first input terminal of the bidirectional DC-AC unit 13, respectively. The first output terminal of the bidirectional DC-DC unit 12 is connected to the first input terminal of the power management unit 14, and the first output terminal of the power management unit 14 is connected to the charging terminal of the energy storage unit 15. The first output terminal of the bidirectional DC-AC unit 13 is connected to the AC output port to output AC power. The second output terminal of the bidirectional DC-DC unit 12 is connected to the DC output port to output DC power. The control terminals of the bidirectional DC-DC unit 12 and the bidirectional DC-AC unit 13 are respectively connected to the control terminal of the MCU 17.

[0042] The output terminal of the energy storage unit 15 is connected to the second input terminal of the power management unit 14, and the second output terminal of the power management unit 14 is connected to the second input terminal of the bidirectional DC-DC unit 12; the first input terminal of the bidirectional DC-DC unit 12 and the first input terminal of the bidirectional DC-AC unit 13 are bidirectionally connected.

[0043] The second input terminal of the bidirectional DC-AC unit 13 is connected to the AC input port.

[0044] In this embodiment, the motor unit 11 (which contains a three-phase rectifier circuit, such as an AC-DC circuit) is used to output a first DC power (e.g., a voltage of 200V-400V), which is input to the bidirectional DC-DC unit 12 and the bidirectional DC-AC unit 13.

[0045] The bidirectional DC-DC unit 12 is used to step down the first DC power output from the motor unit 11 to obtain a second DC power (e.g., a voltage of 80V), and the second DC power charges the energy storage unit 15 through the power management unit 14; or it can boost the third DC power output from the power management unit 14 (the DC power output from the energy storage unit 15, with a voltage of 80V) to obtain a fourth DC power (e.g., a voltage of 200V-400V).

[0046] The bidirectional DC-AC unit 13 is used to invert the first DC power output from the motor unit 11 into a first AC power (e.g., voltage of 100V-240V), and then output it to the load via AC; or to perform power regulation (PFC power regulation) on the third AC power input (mains power) to obtain a fifth DC power (e.g., voltage of 200V-400V); or to invert the fourth DC power output from the bidirectional DC-DC unit 12 into a second AC power (e.g., voltage of 100V-240V), and then output it to the load via AC.

[0047] In this embodiment, the fifth DC power is stepped down by the bidirectional DC-DC unit 12 to obtain the sixth DC power (e.g., the voltage is 80V), and the sixth DC power is used to charge the energy storage unit 15 through the power management unit 14.

[0048] The power management unit 14 is used to manage the power of the second DC power supply, the power of the energy storage unit 15, and the output power of the photovoltaic unit 16. This includes automatically switching between charging and discharging multiple battery packs, automatically switching between photovoltaic charging and bidirectional DC-DC charging, and switching between different battery packs. This ensures that when a battery pack is low during discharge, it switches to another fully charged battery pack, thereby ensuring continuous operation of the equipment. At the same time, it can effectively manage the charging process, avoid overcharging or over-discharging, and extend battery life.

[0049] The energy storage unit 15 can employ multiple batteries to provide power to external loads.

[0050] MCU17 is used to control the operating logic of bidirectional DC-DC unit 12 and bidirectional DC-AC unit 13 according to actual needs.

[0051] In this embodiment, a photovoltaic unit 16 is also included, which converts light energy into electrical energy to output a seventh direct current. The photovoltaic unit 16 is equipped with an existing MPPT (Maximum PowerPoint Tracking) controller, which can detect the power generation voltage of the solar panel in real time and track the highest voltage and current value (VI), so that the system can charge the energy storage unit 15 with the highest efficiency. The output terminal of the photovoltaic unit 16 is connected to the third input terminal of the bidirectional DC-DC unit 12.

[0052] In this embodiment, the seventh DC power output by the photovoltaic unit 16 is used to charge the energy storage unit 15 after passing through the power management unit 14; it can also be used as an AC or DC output.

[0053] In this embodiment, a reverse-drag start unit 18 is also included. The input terminal of the reverse-drag start unit 18 is connected to the third output terminal of the bidirectional DC-DC unit 12, and the output terminal of the reverse-drag start unit 18 is connected to the motor unit 11. When the MCU 17 detects that the power of the energy storage unit 15 is lower than the threshold, the third output terminal of the bidirectional DC-DC unit 12 outputs DC power to the reverse-drag start unit 18. The reverse-drag start unit 18 converts the input DC power and outputs it to the motor unit, thereby driving the motor unit 11 to start and charging the energy storage unit 15.

[0054] The working principle of this utility model is as follows:

[0055] 1. Achieve AC output from the motor: The motor unit 11 outputs the first DC power to the first input terminal of the bidirectional DC-AC unit 13. After inversion, the first AC power is output from the first output terminal of the bidirectional DC-AC unit 13, and then output to the load through the AC output port.

[0056] 2. Achieve battery AC output: The third DC power output from the energy storage unit 15 is boosted to the second input terminal of the bidirectional DC-DC unit 12 through the power management unit 14 to obtain the fourth DC power. The fourth DC power flows into the first input terminal of the bidirectional DC-AC unit 13 through the first input terminal of the DC-DC unit 12. After being inverted by the bidirectional DC-AC unit 13, the second AC power is output from the first output terminal of the bidirectional DC-AC unit 13, and then output to the load through the AC output port.

[0057] 3. Achieve mixed AC output from battery and AC from motor: In this embodiment, AC output from motor or AC output from battery can be achieved separately, or a mixed output of AC output from motor and AC output from battery can be achieved simultaneously, with the load power being the sum of the rated power of motor and battery.

[0058] 4. Achieve energy storage, including motor charging, mains charging, and photovoltaic charging:

[0059] Motor charging: The motor unit 11 outputs a first DC power to the first input terminal of the bidirectional DC-DC unit 12. After being stepped down, a second DC power is output from the first output terminal of the bidirectional DC-DC unit 12. The second DC power is input to the energy storage unit 15 through the charging terminals of the power management unit 14 and the energy storage unit 15 to achieve charging.

[0060] AC mains charging: The third AC power is input to the second input terminal of the bidirectional DC-AC unit 13 through the AC mains port. After power regulation (PFC power regulation), the fifth DC power is obtained. The fifth DC power flows from the first input terminal of the bidirectional DC-AC unit 13 to the first input terminal of the bidirectional DC-DC unit 12. After being stepped down by the bidirectional DC-DC unit 12, the sixth DC power (e.g., the voltage is 80V) is obtained. The sixth DC power is input to the energy storage unit 15 through the charging interruption of the power management unit 14 and the energy storage unit 15 to realize charging.

[0061] Photovoltaic charging: Photovoltaic unit 16 converts light energy (solar energy) into electrical energy, and outputs a seventh DC power after passing through MPPT management. The seventh DC power is input to the energy storage unit 15 through the charging terminal of power management unit 14 and energy storage unit 15 to realize charging.

[0062] like Figure 2 As shown, the specific structure of the bidirectional DC-DC unit 12 is as follows:

[0063] One end of the first switch S1 (which can be a single-pole double-throw switch or a double-pole double-throw switch) is connected to one end of the first capacitor C1, the drain of the first switching transistor Q1, and the drain of the third switching transistor Q3, respectively. One end of the first switch S1 is also connected to the other end of the first capacitor C1, the source of the second switching transistor Q2, and the source of the fourth switching transistor Q4. The source of the first switching transistor Q1 and the drain of the second switching transistor Q2 are connected in parallel to the first port on one side of the first transformer T1. The source of the third switching transistor Q3 and the drain of the fourth switching transistor Q4 are connected in parallel to the second port on one side of the first transformer T1. The gates of the first switching transistor Q1, the second switching transistor Q2, the third switching transistor Q3, and the fourth switching transistor Q4 are connected to the control terminal of the MCU17, respectively.

[0064] The first port on the other side of the first transformer T1 is connected to one end of the first inductor L1, and the other end of the first inductor L1 is connected to the emitter of the fifth switch Q5 and the collector of the sixth switch Q6, respectively. The second port on the other side of the first transformer T1 is connected to one end of the second capacitor C2, and the other end of the second capacitor C2 is connected to the emitter of the seventh switch Q7 and the collector of the eighth switch Q8, respectively. The collector of the fifth switch Q5, the collector of the seventh switch Q7, and one end of the third capacitor C3 are connected in parallel and then connected to the output terminal of the motor unit.

[0065] The emitter of the sixth switch Q6 and the emitter of the eighth switch Q8 are connected in parallel and then connected to the other end of the third capacitor C3.

[0066] The bases of the fifth switch Q5, the sixth switch Q6, the seventh switch Q7, and the eighth switch Q8 are connected to the control terminals of the MCU17.

[0067] In this embodiment, the switching transistors include IGBTs, MOSFETs, and triodes.

[0068] In this embodiment, the working principle of the bidirectional DC-DC unit 12 is as follows:

[0069] (1) Enable the motor unit 11 to supply power to the energy storage unit 15:

[0070] When the first switch S1 is connected to the first contact 1 (the first input terminal of the power management unit 14), the first DC power output by the motor unit 11 (e.g., a voltage of 200V-400V) passes through the fifth switch Q5, the sixth switch Q6, the seventh switch Q7, and the eighth switch Q8 before reaching the first transformer T1 (e.g., ...). Figure 4 As shown, when Q5 and Q8 are working simultaneously, Q6 and Q7 are not working; when Q6 and Q7 are working simultaneously, Q5 and Q8 are not working. The first transformer T1 steps down the first DC power to obtain the second DC power (e.g., 80V). The second DC power is rectified by the body diodes of the first switch Q1, the second switch Q2, the third switch Q3, and the fourth switch Q4 (e.g., ...). Figure 3 As shown, when Q1 and Q4 work simultaneously, Q2 and Q3 do not work; when Q2 and Q3 work simultaneously, Q1 and Q4 do not work. After the first switch S1, the power enters the power management unit 14, and then the power is input to the charging terminal of the power storage unit 15 to realize charging.

[0071] (2) DC output:

[0072] When the first switch S1 is connected to the second contact 2 (DC output port), the second DC power is output from the DC output port to the load;

[0073] (3) Battery power output:

[0074] When the first switch S1 is connected to the first contact 1 (the first input terminal of the power management unit 14), the energy storage unit 15 outputs a third DC power (e.g., 80V), which passes through the power management unit 14 and the first switch S1 before entering the bidirectional DC-DC unit 12, and then through the first switch Q1, the second switch Q2, the third switch Q3, and the fourth switch Q4 (e.g., ...). Figure 3 As shown, when Q1 and Q4 work simultaneously, Q2 and Q3 do not work; when Q2 and Q3 work simultaneously, Q1 and Q4 do not work. The third DC power is then fed to the first transformer T1, which boosts the third DC power to obtain the fourth DC power (e.g., voltage 200V-400V). The fourth DC power then enters the bidirectional DC-AC unit 13, which inverts it to obtain the second AC power (e.g., voltage 100V-240V). The AC power is then supplied to the load through the AC output port to achieve battery power supply.

[0075] like Figure 2 As shown, the specific structure of the bidirectional DC-AC unit 13 is as follows:

[0076] The collector of the ninth tertiary transistor Q9, the collector of the eleventh tertiary transistor Q11, and one end of the third capacitor C3 are connected in parallel and then connected to the output terminal of the motor unit; the emitter of the thirteenth tertiary transistor Q10 and the emitter of the twelfth tertiary transistor Q12 are connected in parallel and then connected to the other end of the third capacitor C3.

[0077] The emitter of the ninth transistor Q9, the collector of the thirteenth transistor Q10, and one end of the fourth capacitor C4 are connected in parallel and then connected to one end of the second switch S2 (which can be a single-pole double-throw switch or a double-pole double-throw switch); the emitter of the eleventh transistor Q11 and the collector of the twelfth transistor Q12 are connected in parallel and then connected to one end of the second inductor L2; the other end of the second inductor L2 and the other end of the fourth capacitor C4 are connected in parallel and then connected to one end of the second switch S2.

[0078] The bases of the ninth tertiary transistor Q9, the thirteenth tertiary transistor Q10, the eleventh tertiary transistor Q11, and the twelfth tertiary transistor Q12 are respectively connected to the control terminal of MCU17.

[0079] In this embodiment, the working principle of the bidirectional DC-AC unit 13 is as follows:

[0080] (1) Achieve AC output from the motor:

[0081] When the second switch S2 is connected to the fourth contact 4 and the sixth contact 6 (AC output port), the first DC power output by the motor unit 11 (e.g., voltage of 200V-400V) is inverted to the first AC power (e.g., voltage of 100V-240V) after passing through the ninth transistor Q9, the thirteenth transistor Q10, the eleventh transistor Q11, and the twelfth transistor Q12, and then output to the load from the AC output port;

[0082] (2) Achieve AC output from battery:

[0083] The fourth DC power output from the bidirectional DC-DC unit 12 enters the bidirectional DC-AC unit 13, is inverted into the second AC power (e.g., voltage 100V-240V), and then goes to the load through the AC output port to achieve battery power supply.

[0084] (3) AC input charging:

[0085] When the second switch S2 is connected to the third contact 3 and the fifth contact 5 (AC input port), the AC input port receives a third AC current (e.g., 240V). This third AC current passes through the ninth tertiary transistor Q9, the thirteenth tertiary transistor Q10, the eleventh tertiary transistor Q11, and the twelfth tertiary transistor Q12 (operating sequence as follows). Figure 5 As shown, when Q12 is working, Q11 is not working, and Q9 and Q10 work alternately. Then, power regulation (PFC power regulation) is performed to obtain the fifth DC power (e.g., voltage of 200V-400V). The fifth DC power is stepped down by the bidirectional DC-DC unit 12 to obtain the sixth DC power (e.g., voltage of 80V). The sixth DC power is used to charge the energy storage unit 15 through the power management unit 14.

[0086] In this application, the bidirectional DC-DC unit 12 and bidirectional DC-AC unit 13 can achieve bidirectional conduction compared to the existing unidirectional conduction, which reduces the number of circuit components required, simplifies the structure, and thus saves costs, while not affecting the realization of multiple functions of the generator set.

[0087] Those skilled in the art will understand that the above embodiments are specific examples of implementing the present invention, and in practical applications, various changes can be made to them in form and detail without departing from the spirit and scope of the present invention.

Claims

1. A multi-functional generator set, comprising a motor unit (11), an energy storage unit (15), and an MCU (17), characterized in that, It also includes a bidirectional DC-DC unit (12), a bidirectional DC-AC unit (13), and a power management unit (14). The output terminal of the motor unit (11) is connected to the first input terminal of the bidirectional DC-DC unit (12) and the first input terminal of the bidirectional DC-AC unit (13), respectively. The first output terminal of the bidirectional DC-DC unit (12) is connected to the first input terminal of the power management unit (14), and the first output terminal of the power management unit (14) is connected to the charging terminal of the energy storage unit (15). The first output terminal of the bidirectional DC-AC unit (13) is connected to the AC output port; the second output terminal of the bidirectional DC-DC unit (12) is connected to the DC output port; the control terminal of the bidirectional DC-DC unit (12) and the control terminal of the bidirectional DC-AC unit (13) are respectively connected to the control terminal of the MCU (17); The output terminal of the energy storage unit (15) is connected to the second input terminal of the power management unit (14), and the second output terminal of the power management unit (14) is connected to the second input terminal of the bidirectional DC-DC unit (12). The second input terminal of the bidirectional DC-AC unit (13) is connected to the AC input port.

2. The multi-functional generator set as described in claim 1, characterized in that, The motor unit (11) is provided with a three-phase rectifier circuit; the three-phase rectifier circuit is used to convert the AC power output by the generator into DC power.

3. A multi-functional generator set as described in claim 1, characterized in that, The energy storage unit (15) includes at least one battery.

4. A multi-functional generator set as described in claim 1, characterized in that, It also includes a photovoltaic unit (16), the output of which is connected to the third input of the bidirectional DC-DC unit (12).

5. A multi-functional generator set as described in claim 4, characterized in that, The photovoltaic unit (16) is equipped with an MPPT controller.

6. A multi-functional generator set as described in claim 1, characterized in that, It also includes a reverse-drag start unit (18); the input end of the reverse-drag start unit (18) is connected to the third output end of the bidirectional DC-DC unit (12), and the output end of the reverse-drag start unit (18) is connected to the motor unit (11).

7. A multi-functional generator set as described in claim 1, characterized in that, The specific structure of the bidirectional DC-DC unit (12) is as follows: One end of the first switch is connected to one end of the first capacitor, the drain of the first switching transistor, and the drain of the third switching transistor, respectively; one end of the first switch is also connected to the other end of the first capacitor, the source of the second switching transistor, and the source of the fourth switching transistor; the source of the first switching transistor and the drain of the second switching transistor are connected in parallel to the first port on one side of the first transformer, and the source of the third switching transistor and the drain of the fourth switching transistor are connected in parallel to the second port on one side of the first transformer; the gates of the first switching transistor, the second switching transistor, the third switching transistor, and the fourth switching transistor are respectively connected to the control terminal of the MCU. The first port on the other side of the first transformer is connected to one end of the first inductor, and the other end of the first inductor is connected to the emitter of the fifth switch and the collector of the sixth switch, respectively. The second port on the other side of the first transformer is connected to one end of the second capacitor, and the other end of the second capacitor is connected to the emitter of the seventh switch and the collector of the eighth switch, respectively. The collector of the fifth switch, the collector of the seventh switch, and one end of the third capacitor are connected in parallel and then connected to the output terminal of the motor unit. The emitters of the sixth and eighth switching transistors are connected in parallel and then connected to the other end of the third capacitor. The bases of the fifth, sixth, seventh, and eighth switching transistors are connected to the control terminals of the MCU.

8. A multi-functional generator set as described in claim 1, characterized in that, The specific structure of the bidirectional DC-AC unit (13) is as follows: The collectors of the ninth and eleventh transistors and one end of the third capacitor are connected in parallel and then connected to the output terminal of the motor unit; the emitters of the thirteenth and twelfth transistors are connected in parallel and then connected to the other end of the third capacitor. The emitter of the ninth transistor, the collector of the thirteenth transistor, and one end of the fourth capacitor are connected in parallel and then connected to one end of the second switch; the emitter of the eleventh transistor and the collector of the twelfth transistor are connected in parallel and then connected to one end of the second inductor; the other end of the second inductor and the other end of the fourth capacitor are connected in parallel and then connected to one end of the second switch. The bases of the ninth, thirteenth, eleventh, and twelfth transistors are connected to the control terminals of the MCU.

9. A multi-functional generator set as described in claim 7, characterized in that, The first switch is a single-pole double-throw switch or a double-pole double-throw switch.

10. A multi-functional generator set as described in claim 8, characterized in that, The second switch is a single-pole double-throw switch or a double-pole double-throw switch.

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