Power supply system of hybrid power engineering machinery and driving device and related components

Abstract

The invention discloses a power supply system and related components of hybrid power engineering machinery and a driving device, and relates to the field of power supply, the power supply system comprises a power source, the power source comprises at least one of an external power source, a power battery and a range extender, and the power source supplies power to a first power distribution unit; the first power distribution unit is used for outputting the input electric energy and supplying power to each inversion unit; the at least two inversion units are used for converting the direct current output by the first power distribution unit into alternating current and then supplying power to a first load in the hybrid power engineering machinery and the driving device, and the number of the inversion units in the working state at the same moment is at least one; and the controller is used for controlling the inversion unit to enter a working state. When a load is driven, only one controller is used for controlling each inversion unit, so that the number of motor controllers is reduced, the circuit connection is simpler, and the occupied space of a power supply loop is reduced. At least two loads in the hybrid power engineering machinery and the driving device are powered by one power supply system.

Description

Technical Field

[0001] This invention relates to the field of power supply, and in particular to a power supply system and related components for a hybrid power engineering machinery and drive device. Background Technology

[0002] Range-extended electric rotary drilling rigs or pure electric rotary drilling rigs have significant energy-saving and environmental protection effects, such as high energy conversion efficiency, high winch energy recovery and regeneration rate, low construction cost, zero emissions in electric mode, and low noise, and have been rapidly promoted and applied. Existing products generally use motors to drive some key long-term high-power loads. However, each motor load in the electric components is driven by an independent water-cooled motor controller, including the power head, main winch, oil pump, platform rotation, and range extender components. This results in a large number of motor controllers, power distribution and control lines, and water-cooling pipelines, occupying a lot of space, making layout, installation, and power distribution difficult. Many components are difficult to protect properly, leading to a high failure rate and high cost, making market promotion still quite challenging. Summary of the Invention

[0003] The purpose of this invention is to provide a power supply system and related components for hybrid power construction machinery and its drive unit. When driving a load, only one controller is needed to control each inverter unit, reducing the number of motor controllers, simplifying circuit connections, and reducing the space required for the power supply circuit. At least two loads in the hybrid power construction machinery and drive unit can be powered by a single power supply system.

[0004] To solve the above-mentioned technical problems, the present invention provides a power supply system for hybrid power engineering machinery and its drive device, comprising:

[0005] A power source, comprising at least one of an external power supply, a power battery, and a range extender, for supplying power to the first power distribution unit;

[0006] The first power distribution unit has a first input terminal connected to the external power source, a second input terminal connected to the output terminal of the power battery, a third input terminal connected to the output terminal of the range extender, and an output terminal connected to the input terminals of at least two inverter units respectively, for outputting the electrical energy input from the first input terminal, the second input terminal, and the third input terminal to power each inverter unit.

[0007] At least two inverter units are provided, and the output of each inverter unit is connected to at least two first loads in the hybrid power engineering machinery and drive device. The inverter units are connected to each other for communication. The inverter units are used to convert the DC power output by the first power distribution unit into AC power to supply power to the first loads. They also send the running clock and working status to the inverter units other than themselves. The number of inverter units in working status at the same time is at least one.

[0008] A controller is connected to the control terminal of each inverter unit and is used to control the inverter unit to enter the working state.

[0009] On the other hand, the first power distribution unit includes a power distribution control module and at least two first contactors, with each first contactor corresponding to one of the inverter units;

[0010] The power distribution control module is connected to the controller. The output terminal of the power distribution control module is connected to the circuit where the coil of each first contactor is located. The first end of the contact of each first contactor is connected to the output terminal of the power source. The second end of the contact of each first contactor is connected to the input terminal of the corresponding inverter unit.

[0011] The power distribution control module is used to control the coil of the first contactor to be energized, and the contacts of the first contactor to close, so as to output the DC power from the power source to the inverter unit.

[0012] On the other hand, the first power distribution unit also includes at least two second contactors and at least two pre-charging resistors, and the inverter unit, the first contactor, the second contactor and the pre-charging resistor correspond one-to-one;

[0013] The output terminal of the power distribution control module is also connected to the circuit where the coil of each second contactor is located. The first end of the contact of each second contactor is connected to the output terminal of the power source. The second end of the contact of each second contactor is connected to the first end of a corresponding pre-charge resistor. The second end of each pre-charge resistor is connected to the input terminal of a corresponding inverter unit.

[0014] The power distribution control module is specifically used to control the coil of the second contactor to be energized, the contacts of the second contactor to be closed for pre-charging, and after the pre-charging is completed, to control the coil of the second contactor to be de-energized, the coil of the first contactor to be energized, and the contacts of the first contactor to be closed, so as to output the DC power output by the power source to the inverter unit.

[0015] On the other hand, the first power distribution unit also includes at least two first diodes and at least two first fuses, with each first diode corresponding to a second contactor and each first fuse corresponding to an inverter unit.

[0016] The anode of the first diode is connected to the output terminal of the power source, the second terminal of the first diode is connected to the first terminal of the contact of the corresponding second contactor, and the first fuse is disposed in the circuit between the power source and the corresponding inverter unit.

[0017] The first diode is used to prevent reverse polarity, and the first fuse is used to blow when the current exceeds a preset current.

[0018] On the other hand, each inverter unit includes at least two inverters and at least two switching modules, each inverter corresponds to at least one switching module, and the switching modules correspond one-to-one with the first load;

[0019] The input terminal of each inverter serves as the input terminal of the inverter unit to which it belongs, and the output terminal of each inverter is connected to the first terminal of at least two switching modules, and the output terminal of each switching module is connected to the corresponding first load.

[0020] The inverter is used to convert the DC power output by the first power distribution unit into AC power. The switching module is used to close to connect the corresponding inverter to the corresponding first load, so as to supply power to the first load. The switching modules connected to the same inverter do not conduct at the same time.

[0021] On the other hand, each of the switching modules includes a switching control module and a third contactor;

[0022] The switching control module is connected to the controller. The output terminal of the switching control module is connected to the circuit where the coil of the third contactor is located. The first end of the contact of the third contactor is connected to the output terminal of the corresponding inverter. The second end of the contact of each third contactor is connected to the corresponding first load.

[0023] The switching control module is used to control the coil of the third contactor to be energized, and the contacts of the third contactor to close, so as to output the AC power output by the inverter to the first load.

[0024] On the other hand, it also includes a second power distribution unit;

[0025] The input terminal of the second power distribution unit is connected to the output terminal of the first power distribution unit, and the output terminal of the second power distribution unit is connected to the second load in the hybrid power engineering machinery and drive device;

[0026] The second power distribution unit is used to output the DC power from the first power distribution unit to power the second load, wherein the operating power of the second load is less than the operating power of the first load.

[0027] On the other hand, it also includes a step-down unit;

[0028] The input terminal of the step-down unit is connected to the output terminal of the first power distribution unit, and the output terminal of the step-down unit is connected to the third load in the hybrid power engineering machinery and drive device.

[0029] The step-down unit is used to step down the DC power output from the first power distribution unit and output it to the third load to supply power to the third load.

[0030] On the other hand, the power supply priority of the power source, from high to low, is external power supply, power battery and range extender.

[0031] To solve the above-mentioned technical problems, the present invention also provides a hybrid power engineering machinery and drive device, including the power supply system of the hybrid power engineering machinery and drive device and the main body of the hybrid power engineering machinery and drive device.

[0032] This application provides a power supply system and related components for a hybrid power construction machinery and drive unit, relating to the field of power supply. The system includes a power source, comprising at least one of an external power supply, a power battery, and a range extender, supplying power to a first power distribution unit; a first power distribution unit for outputting input electrical energy to power various inverter units; at least two inverter units for converting the DC power output from the first power distribution unit into AC power to supply power to a first load in the hybrid power construction machinery and drive unit, with at least one inverter unit operating simultaneously; and a controller for controlling the inverter units to enter the operating state. When driving the load, only one controller is needed to control each inverter unit, reducing the number of motor controllers, simplifying the circuit connection, and reducing the space occupied by the power supply circuit. At least two loads in the hybrid power construction machinery and drive unit can be powered by a single power supply system. Attached Figure Description

[0033] To more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the prior art and embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0034] Figure 1 A schematic diagram of the power supply system for a hybrid power engineering machinery and drive device provided by the present invention;

[0035] Figure 2 A schematic diagram of the power supply system for another hybrid power engineering machinery and drive device provided by the present invention;

[0036] Figure 3 This invention provides a schematic diagram of the structure of a first power distribution unit;

[0037] Figure 4 A schematic diagram of the structure of a switching module provided by the present invention;

[0038] Figure 5 This is a schematic diagram of the structure of a second power distribution unit provided by the present invention. Detailed Implementation

[0039] The core of this invention is to provide a power supply system and related components for hybrid power construction machinery and its drive device. When driving a load, only one controller is needed to control each inverter unit, reducing the number of motor controllers, simplifying circuit connections, and reducing the space occupied by the power supply circuit. At least two loads in the hybrid power construction machinery and drive device can be powered by a single power supply system.

[0040] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0041] Figure 1 This invention provides a schematic diagram of the power supply system for a hybrid power engineering machinery and drive device, comprising:

[0042] Power source 1, which includes at least one of external power supply 11, power battery 12 and range extender 13, is used to supply power to the first power distribution unit 2.

[0043] The first power distribution unit 2 has a first input terminal connected to an external power supply 11, a second input terminal connected to the output terminal of a power battery 12, a third input terminal connected to the output terminal of a range extender 13, and an output terminal connected to the input terminals of at least two inverter units 3, respectively, for outputting the electrical energy input from the first input terminal, the second input terminal, and the third input terminal to power each inverter unit 3.

[0044] At least two inverter units 3, the output of each inverter unit 3 is connected to at least two first loads in the hybrid power engineering machinery and drive device, and the inverter units 3 are connected to each other for converting the DC power output of the first power distribution unit 2 into AC power to supply power to the first loads, and sending the running clock and working status to the inverter units 3 other than themselves. The number of inverter units 3 in working state at the same time is at least one.

[0045] Controller 4 is connected to the control terminal of each inverter unit 3 and is used to control the inverter unit 3 to enter the working state.

[0046] Range-extended electric rotary drilling rigs or pure electric rotary drilling rigs have significant energy-saving and environmental protection effects, such as high energy conversion efficiency, high winch energy recovery and regeneration rate, low construction costs, zero emissions in electric mode, and low noise, and have been rapidly promoted and applied. Existing products generally use electric motors to drive some key, long-term, high-power loads, while other operating components are still hydraulically driven. The hydraulic system has lower energy conversion efficiency, higher energy consumption, and is difficult to control precisely. Meanwhile, each motor load in the electric components is driven by an independent water-cooled motor controller, including the power head, main winch, oil pump, platform rotation, and range extender components. This results in a large number of motor controllers, numerous power distribution and control lines and water-cooling pipelines, occupying a large space, making layout, installation, and power distribution difficult. Many components are difficult to protect adequately, leading to a higher failure rate and higher costs, making market promotion still quite challenging.

[0047] The application effect of using a single motor controller to achieve independent operation of multiple motor loads through control switching is achieved. While meeting the requirements of full electrification of the whole machine, the number of motor controllers, power distribution circuits and water cooling pipes is greatly reduced. The new system architecture solves the problems of large space occupation, difficulty in anti-interference design and layout installation and power distribution, difficulty in adequate protection of many components, high failure rate and high cost of the original system configuration.

[0048] The charging device has its input end connected to an external power source and its output end connected to the input end of the first power distribution unit 2, and is used to convert the AC power output from the external power source into DC power.

[0049] Specifically, the power supply system of the hybrid power engineering machinery and drive device provided in this application only includes one controller 4 and at least two inverter units 3. Each inverter unit 3 is connected to at least two first loads. The controller 4 is connected to each inverter unit 3 to control the operation of the inverter units 3. For example, when the controller 4 controls one inverter unit 3 to enter the working state, the DC power output from the first power distribution unit 2 will be converted by the inverter unit 3 into AC power to supply the connected first loads. Each inverter unit 3 can work simultaneously, thus realizing the function of supplying power to at least two inverter units 3. It should also be noted that the first loads connected to the same inverter unit 3 do not operate simultaneously. Therefore, in order to improve power supply performance, based on the operating logic of the equipment, the loads that work simultaneously can be connected to at least two different inverter units 3, thereby providing power for simultaneous operation.

[0050] For example, in rotary drilling rig construction, the process flow is divided into: lowering the main winch motor - forward rotation of the pressurization motor / power head motor for drilling - reverse rotation of the power head motor / lifting of the main winch motor - platform rotation - soil unloading - platform rotation - repeating the above construction process until the drilling task is completed. Auxiliary operations include the relocation of the travel motor, luffing cylinder, mast cylinder, outriggers, etc., and preparation for drilling. From the construction process flow, it can be seen that the construction process is mainly cyclical, with auxiliary operations primarily involving independent actions, and simultaneous operation of multiple components is relatively rare. To address this characteristic, each load is connected to inverter unit 3.

[0051] This application provides a power supply system for hybrid power construction machinery and its drive unit, relating to the field of power supply. It includes a power source 1, which comprises at least one of an external power supply 11, a power battery 12, and a range extender 13, supplying power to a first power distribution unit; a first power distribution unit 2, which outputs the input electrical energy to supply power to various inverter units 3; at least two inverter units 3, which convert the DC power output from the first power distribution unit 2 into AC power to supply power to a first load in the hybrid power construction machinery and its drive unit, wherein at least one inverter unit 3 is in operation at any given time; and a controller 4, which controls the inverter units 3 to enter the operating state. When driving the load, only one controller 4 controls each inverter unit 3, reducing the number of motor controllers, simplifying the circuit connection, and reducing the space occupied by the power supply circuit. At least two loads in the hybrid power construction machinery and its drive unit can be powered by a single power supply system.

[0052] Based on the above embodiments:

[0053] Figure 3 This invention provides a schematic diagram of the structure of a first power distribution unit;

[0054] In some embodiments, the first power distribution unit 2 includes a power distribution control module 21 and at least two first contactors KM1, with each first contactor KM1 corresponding to an inverter unit 3.

[0055] The power distribution control module 21 is connected to the controller 4. The output terminal of the power distribution control module 21 is connected to the circuit where the coil of each first contactor KM1 is located. The first end of the contact of each first contactor KM1 is connected to the output terminal of the power source 1. The second end of the contact of each first contactor KM1 is connected to the input terminal of the corresponding inverter unit 3.

[0056] The power distribution control module 21 is used to control the coil of the first contactor KM1 to be energized, and the contacts of the first contactor KM1 to close, so as to output the DC power from the power source 1 to the inverter unit 3.

[0057] The first power distribution unit 2 needs to output the DC power from the power source 1 to each inverter unit 3. The power distribution control module 21 determines which inverter unit 3 to output to based on signals sent by the controller 4. When the controller 4 selects a specific inverter unit 3 to operate, the power distribution control module 21 controls the first contactor KM1 in the circuit containing that inverter unit 3 to close its contacts, thereby enabling the power source 1 to output DC power to the inverter unit 3. Specifically, controlling the closure of the first contactor KM1 requires the power distribution control module 21 to energize the circuit containing the coil of the first contactor KM1, causing the contacts of the first contactor KM1 to close and thus achieving conduction.

[0058] For at least two inverter units 3, each inverter unit 3 uses the control logic described above, and each inverter unit 3 has a corresponding first contactor KM1. Controlling the first contactor KM1 corresponding to the inverter unit 3 is equivalent to controlling the inverter unit 3 to be energized.

[0059] Furthermore, when the external power source connected to the power source 1 fails, the power battery 12 can take over the power supply from the power source 1.

[0060] In addition, the contactor is replaced with a controllable switch such as a thyristor, and the power distribution control module 21 controls the conduction and cutoff of the controllable switch, thereby realizing the output of electrical energy from the power source to the inverter unit 3.

[0061] In some embodiments, the first power distribution unit 2 further includes at least two second contactors KM2 and at least two pre-charging resistors R1, and the inverter unit 3, the first contactor KM1, the second contactor KM2 and the pre-charging resistor R1 correspond one-to-one.

[0062] The output of the power distribution control module 21 is also connected to the circuit where the coil of each second contactor KM2 is located. The first end of the contact of each second contactor KM2 is connected to the output of the power source 1. The second end of the contact of each second contactor KM2 is connected to the first end of the corresponding pre-charge resistor R1. The second end of each pre-charge resistor R1 is connected to the input of the corresponding inverter unit 3.

[0063] The power distribution control module 21 is specifically used to control the coil of the second contactor KM2 to be energized, the contacts of the second contactor KM2 to be closed, and pre-charging to be performed. After the pre-charging is completed, the coil of the first contactor KM1 is energized, the contacts of the first contactor KM1 are closed, and the coil of the second contactor KM2 is de-energized, so as to output the DC power output from the power source 1 to the inverter unit 3.

[0064] In the field of power systems, bus pre-charging is a crucial operation. Its core purpose is to control the current to ensure a smooth rise in bus voltage to the target value, preventing equipment damage caused by sudden voltage fluctuations. First, the contacts of the second contactor KM2 are closed, charging the bus capacitor through the series pre-charging resistor R1. When the bus voltage approaches the voltage of the power battery I2, the contacts of the first contactor KM1 are closed, and the contacts of the second contactor KM2 are opened, completing the pre-charging process. If pre-charging is omitted, the large current at the moment the contacts of the first contactor KM1 close may burn out the relay contacts or break down the capacitor.

[0065] Therefore, this application sets up a second contactor KM2, first controlling the second contactor KM2 to close, and then controlling the first contactor KM1 to close after charging is completed, and controlling the second contactor KM2 to open.

[0066] Specifically, controlling the closing of the contacts of the second contactor KM2 requires the power distribution control module 21 to energize the circuit containing the coil of the second contactor KM2, thereby attracting the contacts of the second contactor KM2 and achieving conduction.

[0067] For at least two inverter units 3, each inverter unit 3 uses the control logic described above. Each inverter unit 3 has a corresponding first contactor KM1 and a corresponding second contactor KM2. Controlling the first contactor KM1 and the second contactor KM2 corresponding to the inverter unit 3 is equivalent to controlling the inverter unit 3 to be energized and precharged.

[0068] Alternatively, a single main precharge and power supply circuit can be set up to precharge and power each inverter simultaneously. This is suitable for inverters with lower power ratings, where a single circuit of contactors, precharge contactors, and precharge resistors corresponds to multiple inverters. The principle is that since the inverter power is low, its internal filter capacitor is also small, resulting in a lower precharge current.

[0069] In some embodiments, the first power distribution unit 2 further includes at least two first diodes V1 and at least two first fuses FU1, wherein the first diodes V1 correspond one-to-one with the second contactors KM2 and the first fuses FU1 correspond one-to-one with the inverter unit 3.

[0070] The anode of the first diode V1 is connected to the output terminal of the power source 1, the second terminal of the first diode V1 is connected to the first terminal of the contact of the corresponding second contactor KM2, and the first fuse FU1 is set in the circuit between the power source 1 and the corresponding inverter unit 3.

[0071] The first diode V1 is used for reverse protection, and the first fuse FU1 is used to blow the circuit when the current exceeds the preset current.

[0072] After pre-charging is complete, the voltage on the inverter unit 3 side may be briefly higher than the voltage on the power source 1 or power battery 12 side. At this time, the diode can block the current from flowing in reverse through the pre-charging resistor R1 into the power source 1 or power battery 12, avoiding overload of the pre-charging resistor R1 and preventing the power source 1 or power battery 12 from being subjected to reverse shock.

[0073] Meanwhile, in order to prevent excessive current, a first fuse FU1 is set up. The first fuse FU1 will blow when the current exceeds the preset current, so as to improve the safety of the circuit.

[0074] For at least two inverter units 3, each inverter unit 3 uses the control logic described above, and each inverter unit 3 has a corresponding first diode V1 and a corresponding first fuse FU1.

[0075] In some embodiments, each inverter unit 3 includes at least two inverters and at least two switching modules, each inverter corresponds to at least one switching module, and the switching modules correspond one-to-one with the first load;

[0076] The input terminal of each inverter serves as the input terminal of the inverter unit 3 to which it belongs. The output terminal of each inverter is connected to the first terminal of at least two switching modules, and the output terminal of the switching module is connected to the corresponding first load.

[0077] The inverter is used to convert the DC power output from the first power distribution unit 2 into AC power. The switching module is used to close to connect the corresponding inverter to the corresponding first load, so as to supply power to the first load. The switching modules connected to the same inverter cannot be turned on at the same time.

[0078] by Figure 2For example, this application sets up six inverters, namely the first inverter 31, the second inverter 32, the third inverter 33, the fourth inverter 34, the fifth inverter 35, and the sixth inverter 36. Based on the number of connected loads, the first inverter 31 connects to two loads, so it is equipped with a first switching module 311 and a second switching module 312, which are respectively connected to the left motor of the power head and the left travel motor; the second inverter 32 connects to two loads, so it is equipped with a third switching module 321 and a fourth switching module 322, which are respectively connected to the right motor of the power head and the right travel motor; the third inverter 33 connects to two loads, so it is equipped with a fifth switching module 331 and a sixth switching module 332, which are respectively connected to the main hoist motor and the auxiliary hoist motor; the fourth inverter 35... 4. Since two loads are connected, the seventh switching module 341 and the eighth switching module 342 are set up, which are respectively connected to the range extender 13, the generator and engine and the left electric cylinder of the luffing; the fifth inverter 35 connects three loads, so the ninth switching module 351, the tenth switching module 352 and the eleventh switching module 353 are set up, which are respectively connected to the pressurizing motor, the slewing motor and the left electric cylinder of the mast; the sixth inverter 36 connects two loads, so the twelfth switching module 361 and the thirteenth switching module 362 are set up, which are respectively connected to the right electric cylinder of the luffing and the right electric cylinder of the mast.

[0079] Understandably, only one of the two or three switching modules connected to the same inverter can be on, while the other two are off. Therefore, it's necessary to configure the inverters accordingly, based on the operating sequence: the power head, main winch, range extender 13, and slewing or pressurizing motors need to operate simultaneously, and these motors, along with the traveling and auxiliary winch motors, have relatively high load power. This can be achieved through the interchangeability of switching modules. It should also be noted that the aforementioned loads are all types of the first load category, requiring significant operating power.

[0080] Figure 4 The present invention provides a schematic diagram of the structure of a switching module. In some embodiments, each switching module includes a switching control module and a third contactor KM3.

[0081] The switching control module is connected to the controller 4. The output of the switching control module is connected to the circuit where the coil of the third contactor KM3 is located. The first end of the contact of the third contactor KM3 is connected to the output of the corresponding inverter. The second end of the contact of each third contactor KM3 is connected to the corresponding first load.

[0082] The switching control module is used to control the coil of the third contactor KM3 to be energized, and the contacts of the third contactor KM3 to close, so as to output the AC power from the inverter to the first load.

[0083] Taking a connection of only two loads as an example, the third contactor KM3 includes two sets of contacts: the first set of contacts KM3A and the second set of contacts KM3B. Only one of the two sets of contacts can be in the closed state, while the other is in the closed state. This ensures that at most one of the two first loads connected to the same inverter can be energized. After receiving the control signal from the controller 4, the switching control module controls one of the first and second sets of contacts to close, while the other remains in the closed state.

[0084] Figure 5 The present invention provides a schematic diagram of the structure of a second power distribution unit. In some embodiments, it further includes a second power distribution unit 5.

[0085] The input terminal of the second power distribution unit 5 is connected to the output terminal of the first power distribution unit 2, and the output terminal of the second power distribution unit 5 is connected to the second load in the hybrid power engineering machinery and drive device.

[0086] The second power distribution unit 5 is used to output the DC power from the first power distribution unit 2 to power the second load, the operating power of the second load being less than the operating power of the first load.

[0087] Considering that the equipment includes not only high-power first loads such as motors, but also low-power second loads such as air conditioning compressors or heaters, the second power distribution unit 5 has the same structure as the first power distribution unit 2, including devices such as pre-charge circuits, fuses, and diodes. The power distribution control submodule communicates with the controller to control the pre-charge and the output of DC power from the first power distribution unit 2 to the second load.

[0088] Since the secondary loads, such as the air conditioner compressor and heater, are DC loads, there is no need to convert between DC and AC.

[0089] In some embodiments, a step-down unit 6 is also included;

[0090] The input terminal of the step-down unit 6 is connected to the output terminal of the first power distribution unit 2, and the output terminal of the step-down unit 6 is connected to the third load in the hybrid power engineering machinery and drive device.

[0091] The step-down unit 6 is used to step down the DC power output from the first power distribution unit 2 and output it to the third load to supply power to the third load.

[0092] In addition, it also includes some third loads that require low-voltage power supply, including batteries and 24V low-voltage loads. In this case, the step-down unit 6 needs to step down the DC power output from the first power distribution unit 2 before outputting it to the third load, thereby supplying power to the third load.

[0093] In some embodiments, the power supply priority of the power source, from high to low, is external power supply, power battery 12 and range extender 13.

[0094] The power source includes an external power supply 11, a power battery 12, and a range extender 13. The external power supply 11 can operate independently when it meets the power requirements of the electrical load or when the power battery 12 provides power. Alternatively, the range extender 13, the power battery 12, and / or the external power supply 11 can be used for overall machine operation. When the power supplied by the external power supply 11 is greater than the average power of the load, the external power supply 11 and the power battery 12 can also supply power simultaneously for overall machine operation.

[0095] This application also provides a hybrid power engineering machinery and drive device, including the power supply system of the aforementioned hybrid power engineering machinery and drive device and the hybrid power engineering machinery and drive device body.

[0096] The description of the hybrid power engineering machinery and drive device provided in this application is similar to the above embodiments and will not be repeated here.

[0097] It should also be noted that, in this specification, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0098] Those skilled in the art will further recognize that the units and algorithm steps of the various examples described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, computer software, or a combination of both. To clearly illustrate the interchangeability of hardware and software, the components and steps of the various examples have been generally described in terms of functionality in the foregoing description. Whether these functions are implemented in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementations should not be considered beyond the scope of this invention.

[0099] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A power supply system for hybrid power engineering machinery and its drive device, characterized in that, include: A power source, comprising at least one of an external power supply, a power battery, and a range extender, for supplying power to the first power distribution unit; The first power distribution unit has a first input terminal connected to the external power source, a second input terminal connected to the output terminal of the power battery, a third input terminal connected to the output terminal of the range extender, and an output terminal connected to the input terminals of at least two inverter units, for outputting the electrical energy input from the first input terminal, the second input terminal, and the third input terminal to power each of the inverter units. At least two inverter units are provided, and the output of each inverter unit is connected to at least two first loads in the hybrid power engineering machinery and drive device. The inverter units are connected to each other for communication. The inverter units are used to convert the DC power output by the first power distribution unit into AC power to supply power to the first loads. They also send the running clock and working status to the inverter units other than themselves. The number of inverter units in working status at the same time is at least one. A controller is connected to the control terminal of each inverter unit and is used to control the inverter unit to enter the working state.

2. The power supply system for the hybrid power engineering machinery and drive device as described in claim 1, characterized in that, The first power distribution unit includes a power distribution control module and at least two first contactors, each of which corresponds to one of the inverter units. The power distribution control module is connected to the controller. The output terminal of the power distribution control module is connected to the circuit where the coil of each first contactor is located. The first end of the contact of each first contactor is connected to the output terminal of the power source. The second end of the contact of each first contactor is connected to the input terminal of the corresponding inverter unit. The power distribution control module is used to control the coil of the first contactor to be energized, and the contacts of the first contactor to close, so as to output the DC power from the power source to the inverter unit.

3. The power supply system for the hybrid power engineering machinery and drive device as described in claim 2, characterized in that, The first power distribution unit also includes at least two second contactors and at least two pre-charging resistors, and the inverter unit, the first contactor, the second contactor and the pre-charging resistor correspond one-to-one; The output terminal of the power distribution control module is also connected to the circuit where the coil of each second contactor is located. The first end of the contact of each second contactor is connected to the output terminal of the power source. The second end of the contact of each second contactor is connected to the first end of a corresponding pre-charge resistor. The second end of each pre-charge resistor is connected to the input terminal of a corresponding inverter unit. The power distribution control module is specifically used to control the coil of the second contactor to be energized, the contacts of the second contactor to be closed for pre-charging, and after the pre-charging is completed, to control the coil of the second contactor to be de-energized, the coil of the first contactor to be energized, and the contacts of the first contactor to be closed, so as to output the DC power output by the power source to the inverter unit.

4. The power supply system for the hybrid power engineering machinery and drive device as described in claim 3, characterized in that, The first power distribution unit further includes at least two first diodes and at least two first fuses, wherein the first diodes correspond one-to-one with the second contactors and the first fuses correspond one-to-one with the inverter units; The anode of the first diode is connected to the output terminal of the power source, the second terminal of the first diode is connected to the first terminal of the contact of the corresponding second contactor, and the first fuse is disposed in the circuit between the power source and the corresponding inverter unit. The first diode is used to prevent reverse polarity, and the first fuse is used to blow when the current exceeds a preset current.

5. The power supply system for the hybrid power engineering machinery and drive device as described in claim 1, characterized in that, Each inverter unit includes at least two inverters and at least two switching modules, each inverter corresponds to at least one switching module, and the switching modules correspond one-to-one with the first load; The input terminal of each inverter serves as the input terminal of the inverter unit to which it belongs, and the output terminal of each inverter is connected to the first terminal of at least two switching modules, and the output terminal of each switching module is connected to the corresponding first load. The inverter is used to convert the DC power output by the first power distribution unit into AC power. The switching module is used to close to connect the corresponding inverter to the corresponding first load, so as to supply power to the first load. The switching modules connected to the same inverter do not conduct at the same time.

6. The power supply system for the hybrid power engineering machinery and drive device as described in claim 5, characterized in that, Each of the switching modules includes a switching control module and a third contactor; The switching control module is connected to the controller. The output terminal of the switching control module is connected to the circuit where the coil of the third contactor is located. The first end of the contact of the third contactor is connected to the output terminal of the corresponding inverter. The second end of the contact of each third contactor is connected to the corresponding first load. The switching control module is used to control the coil of the third contactor to be energized, and the contacts of the third contactor to close, so as to output the AC power output by the inverter to the first load.

7. The power supply system for the hybrid power engineering machinery and drive device as described in claim 1, characterized in that, It also includes a second power distribution unit; The input terminal of the second power distribution unit is connected to the output terminal of the first power distribution unit, and the output terminal of the second power distribution unit is connected to the second load in the hybrid power engineering machinery and drive device; The second power distribution unit is used to output the DC power from the first power distribution unit to power the second load, wherein the operating power of the second load is less than the operating power of the first load.

8. The power supply system for the hybrid power engineering machinery and drive device as described in claim 1, characterized in that, It also includes a step-down unit; The input terminal of the step-down unit is connected to the output terminal of the first power distribution unit, and the output terminal of the step-down unit is connected to the third load in the hybrid power engineering machinery and drive device. The step-down unit is used to step down the DC power output from the first power distribution unit and output it to the third load to supply power to the third load.

9. The power supply system for the hybrid power engineering machinery and drive device as described in any one of claims 1 to 8, characterized in that, The power supply priority of the power source, from high to low, is the external power source, the power battery, and the range extender.

10. A hybrid power engineering machine and its drive device, characterized in that, It includes the power supply system of the hybrid engineering machinery and drive unit as described in any one of claims 1 to 9, and the body of the hybrid engineering machinery and drive unit.

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