Hybrid power supply circuit and control method thereof

Abstract

The invention relates to a hybrid power supply circuit and a control method thereof, and the circuit comprises a control circuit which is used for executing at least one of the three functions of charging, pre-charging or power supply according to an operation signal, outputting a first voltage signal when the pre-charging is completed, and outputting a second voltage signal when an external power supply is connected; the battery cabinet is connected in series with the control circuit and is used for providing or storing electric energy and outputting an operation state; the constant electric mode is used for generating a pre-charging signal according to a load demand while detecting an operation state; or generating a power supply signal in response to the first voltage signal; or when the battery cabinet reaches the preset electric quantity, generating a charging signal in response to the second voltage signal; the operation signals comprise a pre-charging signal, a power supply signal and a charging signal and are used for supplying power to and controlling the hybrid power driving bridge erecting machine provided with two sets of systems of range extender driving and battery driving.

Description

Technical Field

[0001] The present application relates to the technical field of engineering machinery, and in particular to a hybrid power supply circuit and a control method thereof. Background Art

[0002] With the continuous growth of energy demand, environmental pressure has become a serious problem that human beings must face for survival and sustainable development. Finding clean and efficient energy solutions has become a hot topic of global concern. In recent years, the national and local levels have vigorously supported the promotion and application of new energy technologies in various fields. The new energy industry has become the most certain development direction in my country. Power batteries and electronic control systems are the core of the new energy industry. At present, they have been successfully applied to automobiles and have achieved good energy-saving effects. However, in the field of engineering machinery, especially bridge erection engineering equipment, there are still many bottlenecks in the application of new energy technologies.

[0003] Due to the remote operating environment of bridge erection engineering equipment, the large power demand of the operating load, and the difficulty in charging and replenishing, the power supply circuit and technical principles of bridge erection engineering equipment are significantly different from those of hybrid electric vehicles or engineering vehicles. Therefore, how to achieve multi-power supply collaborative operation of hybrid-powered bridge erection engineering equipment based on the operating characteristics of bridge erection engineering equipment has become a key issue urgently needed in this field. Summary of the invention

[0004] Based on this, it is necessary to provide a hybrid power supply circuit and a control method thereof to address the technical problems in the prior art, so as to realize the coordinated operation of multiple power supplies for hybrid-powered bridge erection engineering equipment.

[0005] In a first aspect, the present application provides a hybrid power supply circuit, including a control circuit, which is used to perform at least one of the three functions of charging, pre-charging or power supply according to an operation signal, and output a first voltage signal when pre-charging is completed, and output a second voltage signal when an external power supply is connected;

[0006] The battery cabinet is connected in series with the control circuit, and is used to provide or store electric energy and output the operating status; the operating status includes the electric quantity;

[0007] A power management system is communicatively connected to the battery cabinet, and includes a normal power mode and a wake-up mode; the wake-up mode responds to a wake-up signal and is used to detect an operating status; while detecting the operating status, the normal power mode is used to generate a pre-charge signal according to load demand; or to generate a power supply signal in response to a first voltage signal; or to generate a charging signal in response to a second voltage signal when the battery cabinet reaches a preset power level; the operating signal includes a pre-charge signal, a power supply signal, and a charging signal.

[0008] In the hybrid power supply circuit provided in the above embodiment, a power supply circuit including a battery cabinet, a control circuit, and a power management system is designed according to the characteristics of the operating conditions and operating requirements of the bridge erection engineering equipment. As the control center of the power supply circuit, the power management system detects and monitors the operating status of the battery cabinet in real time, optimizes the energy efficiency management and battery maintenance during the operation process, and generates corresponding operation signals according to the load requirements; the control circuit can perform at least one of the three functions of charging, pre-charging or power supply according to the operation signal from the power management system. The flexible switching between the multiple functions can meet the needs of multi-power supply collaborative operation, so that the equipment can continue to operate under different working conditions. In addition, the signal interaction between the power management system and the control circuit enables the power supply circuit to realize automatic function switching under specific conditions, reducing the burden on the operator and improving the operating efficiency and user experience of the bridge erection engineering equipment based on the hybrid power supply circuit.

[0009] In some embodiments, the control circuit includes: a charging circuit, a first input terminal for connecting to an external power source, a second input terminal connected to a first output terminal of a power management system, for receiving an operation signal, a first output terminal connected to a positive electrode of a battery cabinet, and a second output terminal connected to a first input terminal of the power management system;

[0010] The main positive circuit has a first input end connected to the positive electrode of the battery cabinet, a second input end and a third input end connected to the second output end and the third output end of the power management system respectively, and is used to receive an operation signal, the first output end is used to connect to the inverter, and the second output end is connected to the second input end of the power management system;

[0011] The backup circuit has a first input terminal connected to the positive electrode of the battery cabinet, a second input terminal and a third input terminal respectively connected to the fourth output terminal and the fifth output terminal of the power management system, and is used to receive an operation signal, the first output terminal is used to connect to the inverter, and the second output terminal is connected to the third input terminal of the power management system; the power supply priority of the main positive circuit is higher than that of the backup circuit;

[0012] The range extender circuit has a first input terminal connected to the positive pole of the battery cabinet, a second input terminal and a third input terminal respectively connected to the sixth output terminal and the seventh output terminal of the power management system, for receiving operation signals, a first output terminal for connecting the range extender, and a second output terminal connected to the fourth input terminal of the power management system.

[0013] In some embodiments, the first voltage signal includes: a first sub-signal output via the main positive circuit, a second sub-signal output by the backup circuit, and a third sub-signal output by the range extender circuit.

[0014] In some embodiments, the wake-up signal includes: a second voltage signal.

[0015] In some embodiments, the power supply signal includes: a first power supply signal output to the main positive circuit, a second power supply signal output to the backup circuit output, and a third power supply signal output to the range extender circuit.

[0016] In some embodiments, the pre-charge signal includes: a first pre-charge signal output to the main positive circuit, a second pre-charge signal output to the backup circuit output, and a third pre-charge signal output to the range extender circuit.

[0017] In some embodiments, the charging circuit includes:

[0018] A charging relay is configured such that: a first end is connected to a charging fuse, a control end constitutes a second input end of a charging circuit, and is used to perform a switching operation according to a charging signal;

[0019] The first voltage detection component is configured such that the first end is connected to the second end of the charging relay, the second end constitutes the second output end of the charging circuit, and is used to output a second voltage signal when connected to an external power supply, and the third end constitutes the first input end of the charging circuit, and is used to connect to an external power supply.

[0020] In some embodiments, the main positive circuit includes:

[0021] A first main relay is configured as follows: a first end is connected to a first discharge fuse, a control end constitutes a second input end of a main positive circuit, and is used to perform a switching operation according to a first power supply signal;

[0022] A first sub-relay is configured as follows: a first end is connected to a first discharge fuse, a control end constitutes a third input end of the main positive circuit, and is used to perform a switching operation according to a first pre-charging signal;

[0023] The second voltage detection component is configured such that the first end is connected to the second end of the first main relay, the second end constitutes the second output end of the main positive circuit, and is used to output the first sub-signal when pre-charging is completed; and the third end constitutes the first output end of the main positive circuit, and is used to connect to the inverter.

[0024] In some embodiments, the backup circuit includes:

[0025] A second main relay is configured as follows: a first end is connected to a second discharge fuse, a control end constitutes a second input end of the standby circuit, and is used to perform a switching operation according to a second power supply signal;

[0026] A second sub-relay is configured as follows: a first end is connected to a second discharge fuse, a control end constitutes a third input end of the standby circuit, and is used to perform a switching operation according to a second pre-charging signal;

[0027] The third voltage detection component is configured such that the first end is connected to the second end of the second main relay, the second end constitutes the second output end of the standby circuit, and is used to output the second sub-signal when pre-charging is completed; and the third end constitutes the first output end of the standby circuit, and is used to connect to the inverter.

[0028] In some embodiments, the range extender circuit includes:

[0029] A third main relay is configured as follows: a first end is connected to a third discharge fuse, a control end constitutes a second input end of the range extender circuit, and is used to perform a switching operation according to a third power supply signal;

[0030] A third sub-relay is configured as follows: a first end is connected to a third discharge fuse, a control end constitutes a third input end of the range extender circuit, and is used to perform a switching operation according to a third pre-charging signal;

[0031] The third voltage detection component is configured such that the first end is connected to the second end of the third main relay, the second end constitutes the second output end of the range extender circuit, and is used to output the third sub-signal when pre-charging is completed; and the third end constitutes the first output end of the range extender circuit, and is used to connect the range extender.

[0032] In some embodiments, the hybrid power supply circuit further includes: a DC circuit; the DC circuit includes a fourth discharge fuse and a fourth main relay, which are used to provide a wake-up signal to the power management system when the load is working;

[0033] A fourth discharge fuse is configured such that a first end constitutes a first input end of a DC circuit and is connected to a battery cabinet;

[0034] The fourth main relay is configured such that a first end is connected to the second end of the fourth discharge fuse, a control end constitutes a second input end of the DC circuit, and is used to perform a switching operation according to a load working signal, and a second end constitutes a first output end of the fourth main relay, and is used to connect to a DC / DC converter.

[0035] In some embodiments, when the power management system disconnects the relays except the third main relay and the third branch relay, the range extender generates electricity to charge the battery cabinet through the range extender circuit.

[0036] In a second aspect, the present application also provides a control method for a hybrid power supply circuit, which is used to control the hybrid power supply circuit in any of the above implementations.

[0037] The above description is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention and implement it according to the contents of the specification, the following is a detailed description of the preferred embodiments of the present invention in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0039] Figure 1 A circuit diagram of a battery cabinet in a hybrid power supply circuit provided in an embodiment;

[0040] Figure 2 is a schematic diagram of a charging circuit in a hybrid power supply circuit provided in an embodiment;

[0041] Figure 3 is a schematic diagram of a main positive circuit in a hybrid power supply circuit provided in an embodiment;

[0042] Figure 4 A circuit diagram of a backup circuit in a hybrid power supply circuit provided in an embodiment;

[0043] Figure 5 It is a circuit diagram of a range extender circuit in a hybrid power supply circuit provided in an embodiment;

[0044] Figure 6 is a circuit diagram of a DC circuit in a hybrid power supply circuit provided in an embodiment;

[0045] Figure 7 It is a specific circuit diagram of a hybrid power supply circuit provided in an embodiment.

[0046] Description of reference numerals:

[0047] 10. Battery cabinet; 11. Battery box; 101. Battery management unit; 102. Battery pack; 103. Heating plate; 104. Manual maintenance switch; 20. Control circuit; 21. Charging circuit; 211. Charging fuse; 212. Charging relay; 213. First voltage detection component; 22. Main positive circuit; 221. First discharge fuse; 222. First main relay; 223. First sub-relay; 224. Second voltage detection component; 225. First pre-charging resistor; 23. Backup circuit ; 231, second discharge fuse; 232, second main relay; 233, second sub-relay; 234, third voltage detection component; 235, second pre-charge resistor; 24, range extender circuit; 241, third discharge fuse; 242, third main relay; 243, third sub-relay; 244, fourth voltage detection component; 245, third pre-charge resistor; 30, power management system; 31, controller; 40, DC circuit; 401, fourth discharge fuse; 402, fourth main relay. DETAILED DESCRIPTION

[0048] In order to facilitate the understanding of the present application, the present application will be described more fully below with reference to the relevant drawings. The preferred embodiments of the present application are provided in the drawings. However, the present application can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the understanding of the disclosure of the present application more thorough and comprehensive.

[0049] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used herein in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0050] In the case of using “including”, “having”, and “comprising” described herein, another component may be added unless a clear limiting term such as “only”, “consisting of”, etc. is used. Unless mentioned otherwise, a term in the singular form may include a plural form and should not be understood as being one in number.

[0051] It should be understood that although the terms "first", "second", etc. may be used herein to describe various elements, these elements should not be limited by these terms. These terms are only used to distinguish one element from another element. For example, a first element may be referred to as a second element, and similarly, a second element may be referred to as a first element without departing from the scope of the present application.

[0052] In this application, unless otherwise clearly specified and limited, the terms "connected", "connection" and the like should be understood in a broad sense, for example, it can be directly connected or indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, if the connected circuits, modules, units, etc. have the transmission of electrical signals or data between each other, it should be understood as "electrical connection", "communication connection", etc.

[0053] When used herein, the singular forms "a", "an", and "said / the" may also include plural forms, unless the context clearly indicates otherwise. It should also be understood that the terms "include / comprise" or "have" and the like specify the presence of stated features, wholes, steps, operations, components, parts, or combinations thereof, but do not exclude the possibility of the presence or addition of one or more other features, wholes, steps, operations, components, parts, or combinations thereof. At the same time, the term "and / or" used in this specification includes any and all combinations of the relevant listed items.

[0054] Among bridge erection engineering equipment, bridge erection machines usually operate in remote areas and have high power requirements for operating loads. Although the traditional diesel engine drive method can support the operation of bridge erection machines, it consumes a lot of fuel, has low fuel energy utilization, and the burning of fuel will cause environmental pollution; the pure electric drive method has been applied with the development of new energy technologies, but bridge erection machines are usually inconvenient to charge and replenish, which restricts the long-distance and long-term operation of bridge erection machines; the hybrid drive power supply system that uses a range extender and a battery pack hybrid drive overcomes the shortcomings of the above two methods.

[0055] However, most of the existing hybrid power supply systems need to be equipped with a generator to power the range extender to maintain operation, which reduces energy utilization. Hybrid systems that use batteries as power sources need to frequently charge the batteries through external interfaces, which are not suitable for bridge-building machines operating in remote areas and where charging is inconvenient, making it difficult to maintain long-term operation. In addition, in the existing hybrid power supply systems, there is a lack of power supply circuit design for the range extender and battery pack to supply power synchronously, and the high-power operating conditions of the bridge-building machine are not taken into consideration.

[0056] Based on this, the present application provides a hybrid power supply circuit, including: a control circuit 20, which is used to perform at least one of the three functions of charging, pre-charging or power supply according to an operation signal, and output a first voltage signal when pre-charging is completed, and output a second voltage signal when an external power supply is connected; a battery cabinet 10, which is connected in series with the control circuit 20, is used to provide or store electrical energy and output an operating status; the operating status includes the power; a power management system 30, which is communicatively connected to the battery cabinet 10, including a normal power mode and a wake-up mode; the wake-up mode responds to the wake-up signal and is used to detect the operating status; the normal power mode is used to generate a pre-charging signal according to load demand while detecting the operating status; or generate a power supply signal in response to the first voltage signal; or generate a charging signal in response to the second voltage signal when the battery pack reaches a preset power; the operation signal includes a pre-charging signal, a power supply signal and a charging signal.

[0057] Specifically, the power supply circuit is used to power and control a hybrid-powered bridge crane with two systems, namely, a range extender drive and a battery drive, and includes a battery cabinet 10 (including an auxiliary inverter), a power management system 30, an auxiliary power cabinet, a range extender, and a frequency converter control cabinet;

[0058] See also Figure 1The battery cabinet 10 contains multiple battery boxes 11, which output high voltage in series. Each battery box 11 contains a battery management unit 101 (Battery Management Unit, BMU), a battery pack 102, a heating plate 103 and a manual service disconnect 104 (Manual Service Disconnect, MSD). The battery pack 102 is connected to the battery management unit 101 through a temperature acquisition line, and the manual service switch 104 between different battery boxes 11 is connected to the battery pack 102 through a voltage acquisition line. The heating plate 103 is connected to a heating relay and a liquid cooling relay; the sensor collects the temperature and voltage information of the battery pack 102 and sends it to the battery management unit 101 of each battery box 11. The battery management unit 101 aggregates the information to an internal communication line through an internal (Controller Area Network, CAN) communication interface.

[0059] The manual maintenance switch 104 is used for module maintenance.

[0060] See also Figure 2-Figure 5 The control circuit 20 is arranged in the auxiliary power supply cabinet to provide an auxiliary power supply unit for the whole machine and realize the charging and discharging circuit. In some embodiments, the control circuit 20 includes: a charging circuit 21, a main positive circuit 22, a backup circuit 23 and a range extender circuit 24.

[0061] It should be noted that, in some embodiments, the first voltage signal includes: a first sub-signal output via the main positive circuit 22, a second sub-signal output by the backup circuit 23, and a third sub-signal output by the range extender circuit 24; the power supply signal includes: a first power supply signal output to the main positive circuit 22, a second power supply signal output to the backup circuit 23, and a third power supply signal output to the range extender circuit 24; and / or the pre-charge signal includes: a first pre-charge signal output to the main positive circuit 22, a second pre-charge signal output to the backup circuit 23, and a third pre-charge signal output to the range extender circuit 24.

[0062] The components, connection methods and signal transmission directions of the charging circuit 21, the main positive circuit 22, the standby circuit 23 and the range extender circuit 24 are as follows:

[0063] See also Figure 2 , the charging circuit 21, the first input end is used to connect to the external power supply, the second input end is connected to the first output end of the power management system 30, and is used to receive the operation signal, the first output end is connected to the positive pole of the battery cabinet 10, and the second output end is connected to the first input end of the power management system 30; in some embodiments, the charging circuit 21 includes a charging fuse 211, a charging relay 212 and a first voltage detection component 213. For ease of understanding, Figure 2In the figure, input 1 represents the first input terminal, input 2 represents the second input terminal, output 1 represents the first output terminal, and output 2 represents the second output terminal. The same marking method is used in other schematic diagrams.

[0064] Connection method: Figure 2 As shown, the first end of the charging fuse 211 constitutes the first output end of the charging circuit 21, and the second end is connected to the first end of the charging relay 212. The control end of the charging relay 212 constitutes the second input end of the charging circuit 21 and receives the charging signal from the power management system 30. The second end is connected to the first end of the first voltage detection component 213. The second end of the first voltage detection component 213 constitutes the second output end of the charging circuit 21, which is used to connect to an external power supply and output a second voltage signal. The third end constitutes the first input end of the charging circuit 21, which is used to connect to an external power supply.

[0065] Illustratively, the external power source includes a charging station;

[0066] For example, the charging fuse 211 can be quickly blown when a short circuit occurs in the charging circuit 21, thereby protecting the circuit.

[0067] See also Figure 3 , a main positive circuit 22, a first input end connected to the positive pole of the battery cabinet 10, a second input end and a third input end are respectively connected to the second output end and the third output end of the power management system 30, for receiving an operation signal, the first output end is used to connect to the inverter, and the second output end is connected to the second input end of the power management system 30; in some embodiments, the main positive circuit 22 includes a first discharge fuse 221, a first main relay 222, a first sub-relay 223, a second voltage detection component 224 and a first pre-charging resistor 225.

[0068] Connection method: Figure 3 As shown, the connection mode between the first discharge fuse 221, the first main relay 222 and the second voltage detection component 224 is consistent with that in the charging circuit 21, except that the control end of the first main relay constitutes the second input end of the main positive circuit 22 and receives the first power supply signal from the power management system 30. The second voltage detection component 224 constitutes the second input end of the main positive circuit, and is used to output the first sub-signal when the inverter pre-charging is completed. It should be understood that in order to intuitively represent the relative position of the charging circuit 21 and the main positive circuit 22, Figure 3 Only the charging circuit 21 is simplified and shown. Of course, the schematic diagram provided in this application is only an example of the hybrid power supply circuit in this embodiment. There may also be other suitable schematic diagrams, which are not limited here.

[0069] The first end of the first sub-relay 223 is connected to the second end of the first discharge fuse 221, the control end constitutes the third input end of the main positive circuit 22, and receives the first pre-charging signal from the power management system 30, the second end is connected to the first end of the first pre-charging resistor 225, the second end of the first pre-charging resistor 225 is connected to the third end of the second voltage detection component 224, and constitutes the first output end of the main positive circuit 22, and is used to connect the inverter.

[0070] Among them, the first discharge fuse 221 can be quickly blown when a short circuit occurs in the main positive circuit 22, and the function of the subsequent fuses is the same as that of the above-mentioned charging fuse 211 and the first discharge fuse 221.

[0071] The first pre-charging resistor 225 is used to prevent the startup current from being too large. The function of the pre-charging resistor mentioned later in this application is the same as that of the first pre-charging resistor 225.

[0072] The rated current of the first main relay 222 is greater than the rated current of the first sub-relay 223, and matches the voltage of the battery pack 102 to meet the power supply demand of the battery pack 102 for the load. The difference between the main relay and sub-relay mentioned later in this application is consistent with the above.

[0073] See also Figure 4 , the backup circuit 23, the first input end is connected to the positive pole of the battery cabinet 10, the second input end and the third input end are respectively connected to the fourth output end and the fifth output end of the power management system 30, for receiving the operation signal, the first output end is used to connect the inverter, and the second output end is connected to the third input end of the power management system 30; the power supply priority of the main positive circuit 22 is higher than that of the backup circuit 23; in some embodiments, the backup circuit 23 includes a second discharge fuse 231, a second main relay 232, a second sub-relay 233, a third voltage detection component 234 and a second pre-charging resistor 235.

[0074] Connection method: Figure 4 As shown, the connection method between the second discharge fuse 231, the second main relay 232, the second sub-relay 233, the third voltage detection component 234 and the second pre-charging resistor 235 in the standby circuit 23 is consistent with that in the main positive circuit 22; wherein, the control end of the second main relay 232 constitutes the second input end of the standby circuit 23 and receives the second power supply signal, the control end of the second sub-relay 233 constitutes the third input end of the standby circuit 23 and receives the second pre-charging signal, and the third voltage detection component 234 constitutes the second output end of the standby circuit 23, which is used to output the second sub-signal when the inverter completes pre-charging.

[0075] See also Figure 5, the range extender circuit 24, the first input end is connected to the positive electrode of the battery cabinet, the second input end and the third input end are respectively connected to the sixth output end and the seventh output end of the power management system, for receiving an operation signal, the first output end is used to connect the range extender, and the second output end is connected to the fourth input end of the power management system. In some embodiments, the range extender circuit 24 includes a third discharge fuse 241, a third main relay 242, a third sub-relay 243, a fourth voltage detection component 244 and a third pre-charging resistor 245.

[0076] Connection method: Figure 5 As shown, in addition to the same connection method as the main positive circuit 22 and the standby circuit 23, the control end of the third main relay 242 constitutes the second input end of the range extender circuit 24 and receives the third power supply signal, the control end of the third sub-relay 243 constitutes the third input end of the range extender circuit 24 and receives the third pre-charging signal, and the fourth voltage detection component 244 constitutes the second output end of the range extender circuit 24, which is used to output the third sub-signal when the inverter completes pre-charging.

[0077] In some embodiments, the range extender circuit 24 can not only pre-charge and supply power to the range extender, but also serve as a charging circuit for charging the battery cabinet 10 when the range extender generates electricity. The specific process is analyzed in detail below.

[0078] See also Figure 6 In some embodiments, the hybrid power supply circuit further includes: a DC circuit 40; the DC circuit includes a fourth discharge fuse 401 and a fourth main relay 402, which are used to provide a wake-up signal to the power management system 30 when the load is working; the fourth discharge fuse 401 is configured such that the first end constitutes the first input end of the DC circuit 40 and is connected to the battery cabinet 10; the fourth main relay 402 is configured such that the first end is connected to the second end of the fourth discharge fuse 401, the control end constitutes the second input end of the DC circuit 40, and is used to perform a switching operation according to the load working signal, and the second end constitutes the first output end of the fourth main relay 402, which is used to connect to the DC / DC converter, and the connection method is as follows: Figure 6 shown.

[0079] It should be understood that the power supply circuit may also include other components, as long as the circuit structure is reasonable, and no further elaboration is given here.

[0080] See also Figure 7 The battery management system 30 (BMS) includes a controller 31 .

[0081] The controller 31 includes first to sixth input terminals and first to eighth output terminals; wherein, the first input terminal and the first output terminal are connected to the charging circuit 21, the second input terminal, the second output terminal and the third output terminal are connected to the main positive circuit 22, the third input terminal, the fourth output terminal and the fifth output terminal are connected to the backup circuit 23, the fourth input terminal, the sixth output terminal and the seventh output terminal are connected to the range extender circuit 24, the fifth input terminal is connected to the output terminal of the DC / DC converter, the sixth input terminal is connected to the internal communication line of the battery cabinet 10, and the eighth output terminal is connected to the external communication line, and the external communication line is used to send out a warning message when the controller detects that the operating state of the battery pack 102 is abnormal or the control circuit 20 is short-circuited.

[0082] In addition to the above connection relationships, the controller 31 can also be connected to Hall sensors, IO expansion modules, 4G antennas, etc.; among them, the Hall sensor can provide more accurate current monitoring functions, improve the controller 31's ability to identify abnormalities in the overall circuit, and timely discover and generate early warning signals to ensure the stability and efficiency of the power supply circuit. The embedded 4G communication module allows managers to conveniently monitor the equipment in real time through remote terminal devices such as smartphones or computers, and make necessary adjustments or controls in real time, simplifying the operating process while enhancing real-time perception of equipment status and safety assurance.

[0083] Specifically, the working mode of the power management system 30 is "normal power + wake-up". When the bridge crane is operating, the DC circuit 40 of the battery pack 102 is connected to the DC / DC converter to supply 24V normal power to the controller 31, wake up the power management system 30 and enter the working mode. When charging, the external charging pile supplies 24V (ie, the second voltage signal) as a wake-up signal through the external interface.

[0084] In a second aspect, the present application provides a control method for a hybrid power supply circuit, which is used to control the hybrid power supply circuit in the above-mentioned embodiment.

[0085] For details, please continue to see Figure 7 , Figure 7 A specific circuit structure diagram of a hybrid power supply circuit provided by the present application is shown. In conjunction with the specific circuit structure diagram, the control method of the power supply circuit is specifically as follows:

[0086] (1) When the bridge erection machine is operating, the fourth main relay 402 in the DC circuit 40 is energized to supply power to the DC / DC converter, and the DC / DC converter outputs a DC 24V power supply to supply power to the controller 31 to wake up the power management system. The controller 31 obtains the voltage and temperature monitoring information of the battery pack 102 through the internal communication line to determine whether the status of the battery pack 102 meets the operating conditions. When the battery pack 102 is over-temperature, over-voltage or under-voltage, the controller 31 issues an alarm and outputs an alarm signal through the external communication line to control the sound and light alarm to issue an alarm.

[0087] (2) When only the battery cabinet 10 (i.e., the internal battery pack 102) is used to supply power to the outside, the controller 31 checks that the status of the battery pack 102 is correct, then outputs a first pre-charging signal, turns on the first main relay 222, and pre-charges the inverter. After the output end of the main positive circuit 22 is energized (i.e., the second voltage detection component 224 outputs a first sub-signal), the controller 31 receives the first sub-signal, outputs a first power supply signal, and causes the first sub-relay 223 to close, thereby supplying power to the inverter. The inverter inverts the DC power of the battery pack 102 into 380V AC power, which is then connected to the inverter control cabinet, thereby driving the drive motor to work.

[0088] If the backup circuit 23 is enabled, the controller 31 outputs a second pre-charging signal to connect the second main relay 232 to pre-charge the inverter. After the output end is powered, the controller 31 receives a second sub-signal and outputs a second power supply signal to control the second sub-relay 233 to close, powering the inverter. The inverter converts the DC power of the battery pack into 380V AC power and then connects it to the frequency converter control cabinet, thereby driving the drive motor to work.

[0089] (3) When only the range extender is used for driving, the controller 31 checks that the battery pack 102 is in correct state, and then controls the third main relay 242 in the range extender circuit 24 to be energized to pre-charge the range extender. After the pre-charging is completed, the third sub-relay 243 is controlled to be energized. At this time, the battery pack 102 supplies power to the range extender, and the range extender drives the bridge crane to operate.

[0090] (4) When the battery pack 102 and the range extender are used to supply power to the outside at the same time, after the controller 31 confirms that the battery pack 102 is in a correct state, in addition to connecting the main positive circuit 22 or the backup circuit 23, the third sub-relay 243 of the range extender circuit 24 is energized to pre-charge the range extender. After the controller 31 detects the third sub-signal, it outputs the third power supply signal to control the third main relay 242 to be energized to continuously supply power to the range extender, and the range extender generates electricity to the outside, so that the battery pack 102 and the range extender simultaneously supply power to the outside.

[0091] (5) When the range extender is used to charge the battery pack 102, the controller 31 monitors the voltage of the battery pack 102 collected by the battery management unit 101 through the internal communication line to obtain the power state of the battery pack 102. When the power is chargeable, the power management system 30 controls to cut off other circuit relays and keep the range extender circuit 24 running (the third main relay 242 and the third branch relay 243). The range extender generates electricity through the range extender circuit 24 to charge the battery pack 102. When the controller 31 monitors the voltage information of the battery pack 102 collected by the battery management unit 101 through the internal communication line and determines that the battery pack 102 is full, it stops charging the battery pack 102. If the power of the battery pack 102 reaches more than 98% before charging, the controller 31 transmits a signal through the external communication line to indicate that the battery is fully charged. The controller 31 transmits a signal through the external communication line to indicate the start and completion of charging of the battery pack 102.

[0092] (6) When the charging pile is used to charge the battery pack 102, the controller 31 monitors the voltage of the battery management unit 101 through the internal communication line to determine the power information. When the power of the battery pack 102 is lower than 95%, and the first voltage detection component 213 of the charging circuit 21 detects that there is power (connected to the external power supply) on the input side, the controller 31 receives the second voltage signal and outputs a charging signal to control the charging relay 212 to close and charge the battery pack 102. When the controller 31 monitors that the voltage of the battery pack 102 meets the requirement, that is, when it is fully charged, the charging relay 212 is disconnected.

[0093] The hybrid power supply circuit and control method provided by the present application have the following unexpected technical effects:

[0094] In view of the characteristics of bridge-building machines operating in remote areas, and in combination with the operating conditions and requirements of bridge-building machines, the hybrid power supply circuit and control method provided in this application take into account both system efficiency and environmental friendliness. It not only allows the use of battery packs to power the hybrid drive system, but also can recover the energy of the range extender to charge the battery pack, which meets the high-power operating conditions of the bridge-building machine, and significantly improves energy utilization, reduces carbon emissions, and complies with the principles of sustainable development.

[0095] The power supply circuit supports the battery pack and the range extender to be driven independently, or the two to work together, to realize the power supply and control of the hybrid bridge crane battery drive, the range extender drive, and the battery and the range extender driving at the same time, which can adapt to high-power operating conditions and ensure high efficiency under various workload conditions;

[0096] In addition, the power supply circuit is designed to be simple and has multiple manual maintenance switches to solve the problem of complex hybrid power supply circuits and inconvenient maintenance of the power supply circuits for bridge cranes operating in remote areas.

[0097] In the description of this specification, the description with reference to the terms "some embodiments", "other embodiments", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic description of the above terms does not necessarily refer to the same embodiment or example.

[0098] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0099] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the present application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the attached claims.

Claims

1. A hybrid power supply circuit, characterized in that: include: A control circuit, configured to perform at least one of the three functions of charging, pre-charging or power supply according to an operation signal, and output a first voltage signal when pre-charging is completed, and output a second voltage signal when an external power supply is connected; A battery cabinet, connected in series with the control circuit, for providing or storing electric energy and outputting an operating status; the operating status includes the electric quantity; A power management system, which is connected to the battery cabinet in communication, includes a normal power mode and a wake-up mode; the wake-up mode is responsive to a wake-up signal and is used to detect the operation status; The normal power mode is used to generate a pre-charging signal according to load demand while detecting the operating status; or to generate a power supply signal in response to the first voltage signal; or to generate a charging signal in response to the second voltage signal when the battery cabinet reaches a preset power level; the operating signal includes the pre-charging signal, the power supply signal and the charging signal.

2. The hybrid power supply circuit according to claim 1, characterized in that: The control circuit includes: A charging circuit, wherein the first input end is used to connect to an external power source, the second input end is connected to the first output end of the power management system, and is used to receive the operation signal, the first output end is connected to the positive electrode of the battery cabinet, and the second output end is connected to the first input end of the power management system; A main positive circuit, wherein the first input end is connected to the positive electrode of the battery cabinet, the second input end and the third input end are respectively connected to the second output end and the third output end of the power management system, and is used to receive the operation signal, the first output end is used to connect to the inverter, and the second output end is connected to the second input end of the power management system; The backup circuit has a first input end connected to the positive electrode of the battery cabinet, a second input end and a third input end connected to the fourth output end and the fifth output end of the power management system respectively, and is used to receive the operation signal, the first output end is used to connect to the inverter, and the second output end is connected to the third input end of the power management system; the power supply priority of the main positive circuit is higher than that of the backup circuit; The range extender circuit has a first input terminal connected to the positive pole of the battery cabinet, a second input terminal and a third input terminal respectively connected to the sixth output terminal and the seventh output terminal of the power management system, for receiving the operation signal, a first output terminal for connecting the range extender, and a second output terminal connected to the fourth input terminal of the power management system.

3. The hybrid power supply circuit according to claim 2, characterized in that: Include at least one of the following technical features: The first voltage signal includes: a first sub-signal output via the main positive circuit, a second sub-signal output by the backup circuit, and a third sub-signal output by the range extender circuit; The wake-up signal includes: the second voltage signal; The power supply signal includes: a first power supply signal output to the main positive circuit, a second power supply signal output to the backup circuit, and a third power supply signal output to the range extender circuit; and / or The pre-charge signal includes: a first pre-charge signal output to the main positive circuit, a second pre-charge signal output to the backup circuit, and a third pre-charge signal output to the range extender circuit.

4. The hybrid power supply circuit according to claim 3, characterized in that: The charging circuit comprises: A charging relay, configured as follows: a first end is connected to a charging fuse, a control end constitutes a second input end of the charging circuit, and is used to perform a switching operation according to the charging signal; The first voltage detection component is configured such that the first end is connected to the second end of the charging relay, the second end constitutes the second output end of the charging circuit, and is used to output the second voltage signal when connected to an external power supply, and the third end constitutes the first input end of the charging circuit, and is used to connect to an external power supply.

5. The hybrid power supply circuit according to claim 3, characterized in that: The main positive circuit comprises: A first main relay is configured as follows: a first end is connected to a first discharge fuse, a control end constitutes a second input end of the main positive circuit, and is used to perform a switching operation according to the first power supply signal; a first sub-relay, configured as follows: a first end connected to the first discharge fuse, a control end constituting a third input end of the main positive circuit, and being used to perform a switching operation according to the first pre-charging signal; The second voltage detection component is configured such that the first end is connected to the second end of the first main relay, the second end constitutes the second output end of the main positive circuit, and is used to output the first sub-signal when pre-charging is completed; and the third end constitutes the first output end of the main positive circuit, and is used to connect to the inverter.

6. The hybrid power supply circuit according to claim 3, characterized in that: The backup circuit comprises: A second main relay is configured as follows: a first end is connected to a second discharge fuse, a control end constitutes a second input end of the standby circuit, and is used to perform a switching operation according to the second power supply signal; a second sub-relay, configured as follows: a first end connected to the second discharge fuse, a control end constituting a third input end of the standby circuit, and being used to perform a switching operation according to the second pre-charging signal; The third voltage detection component is configured such that the first end is connected to the second end of the second main relay, the second end constitutes the second output end of the backup circuit, and is used to output the second sub-signal when pre-charging is completed; and the third end constitutes the first output end of the backup circuit, and is used to connect to the inverter.

7. The hybrid power supply circuit according to claim 3, characterized in that: The range extender circuit comprises: a third main relay, configured as follows: a first end connected to a third discharge fuse, a control end constituting a second input end of the range extender circuit, and being used to perform a switching operation according to the third power supply signal; a third sub-relay, configured as follows: a first end connected to the third discharge fuse, a control end constituting a third input end of the range extender circuit, and being used to perform a switching operation according to the third pre-charging signal; The third voltage detection component is configured such that the first end is connected to the second end of the third main relay, the second end constitutes the second output end of the range extender circuit, and is used to output the third sub-signal when pre-charging is completed; and the third end constitutes the first output end of the range extender circuit, and is used to connect the range extender.

8. The hybrid power supply circuit according to any one of claims 1 to 7, characterized in that: Also includes: DC circuits; The DC circuit includes a fourth discharge fuse and a fourth main relay, which are used to provide the wake-up signal to the power management system when the load is working; The fourth discharge fuse is configured such that a first end thereof constitutes a first input end of the DC circuit and is connected to the battery cabinet; The fourth main relay is configured such that a first end is connected to the second end of the fourth discharge fuse, a control end constitutes a second input end of the DC circuit, and is used to perform a switching operation according to a load working signal, and a second end constitutes a first output end of the fourth main relay, and is used to connect a DC / DC converter.

9. The hybrid power supply circuit according to any one of claims 1 to 7, characterized in that: When the power management system disconnects the relays except the third main relay and the third branch relay, the range extender generates electricity to charge the battery cabinet through the range extender circuit.

10. A control method for a hybrid power supply circuit, characterized in that: Used to control the hybrid power supply circuit described in any one of claims 1-9.

Images