CN217335445U - External power supply device of tractor and tractor - Google Patents

Abstract

The utility model relates to the technical field of tractors, and provides an external power supply unit of tractor and tractor, the external power supply unit of tractor includes chopper circuit, isolation device and rectifier circuit, the electric power source of tractor is connected to chopper circuit's one end, wherein, the electric power source includes generating set and/or power battery, chopper circuit converts the direct current of electric power source output into two-way direct current pulse electricity of pulsewidth adjustable, and the isolation device is connected with chopper circuit's the other end electricity to keep apart chopper circuit and rear end circuit; the two ends of the rectifying circuit are respectively electrically connected with the isolation device and the direct current load so as to electrically rectify the bidirectional direct current pulse into stable direct current and supply power to the direct current load; the utility model discloses make the tractor not only satisfy the needs of operating modes such as pulling, power take off, but also can provide the electric energy for other consumer in field or open air region to be applicable to electric drive or pure electric tractor, increase tractor's practicality.

Description

External power supply device of tractor and tractor

Technical Field

The utility model relates to a tractor technical field particularly, relates to an external power supply unit and tractor of tractor.

Background

The tractor is a self-propelled power machine which mechanically completes various mobile operations in a traction and driving mode and can also be used as power for fixed operations. Since tractors are typically operated in the field or off-road areas, which typically do not have available industrial and residential power stations, they are not able to power off-board equipment such as electric farm implements, motors, electric welding, electric vehicles, and other dc loads.

SUMMERY OF THE UTILITY MODEL

The utility model solves the problem of how to supply power to the tractor for the external direct current load so as to increase the practicability of the tractor.

In order to solve the problem, the utility model provides a tractor's external power supply unit, including direct current converting circuit, direct current converting circuit includes chopper circuit, isolation device and rectifier circuit, chopper circuit is suitable for the electric power source of connecting the tractor, with will the direct current of electric power source output converts the adjustable direct current pulse electricity of pulsewidth into, the isolation device with chopper circuit electricity is connected to keep apart chopper circuit and rear end circuit, rectifier circuit's one end with the isolation device is connected, rectifier circuit's the other end is used for connecting the direct current load, with will two-way direct current pulse electricity rectification forms stable direct current, and is right direct current load supplies power.

Optionally, the dc conversion circuit further includes a first filter circuit, and two ends of the first filter circuit are electrically connected to the electric power source and the chopper circuit, respectively, so as to filter the dc power output by the electric power source.

Optionally, the dc conversion circuit further includes a second filter circuit, and two ends of the second filter circuit are electrically connected to the rectifier circuit and the dc load, respectively.

Optionally, the electrical power source comprises a generator set and/or a power battery.

Optionally, the external power supply device of the tractor further includes a first isolation driving device, the chopper circuit includes a first IGBT module, a second IGBT module, a third IGBT module, and a fourth IGBT module, bases of the first IGBT module, the second IGBT module, the third IGBT module, and the fourth IGBT module are electrically connected to the first isolation driving device, collectors of the first IGBT module and the third IGBT module are electrically connected to an anode of the first filter circuit, emitters of the first IGBT module and the third IGBT module are electrically connected to collectors of the second IGBT module and the fourth IGBT module, and emitters of the second IGBT module and the fourth IGBT module are electrically connected to a cathode of the first filter circuit.

Optionally, the external power supply device of the tractor further includes an ac conversion circuit, the ac conversion circuit includes an inverter circuit, and two ends of the inverter circuit are respectively used for connecting the power source and the ac load.

Optionally, the ac conversion circuit further includes an isolation power device, and two ends of the isolation power device are electrically connected to the inverter circuit and the ac load, respectively.

Optionally, the ac conversion circuit further includes a third filter circuit, and two ends of the third filter circuit are electrically connected to the inverter circuit and the isolation power device, respectively, so as to filter the three-phase ac power output by the inverter circuit.

Optionally, the ac conversion circuit includes a second isolation driving device, and the second isolation driving device is electrically connected to the inverter circuit to control an output of the inverter circuit.

Compared with the prior art, the utility model can be electrically connected with the electric power source of the tractor through the chopper circuit to convert the continuous direct current output by the electric power source into the bidirectional direct current pulse electricity with adjustable pulse width, in other words, the chopper module can convert the continuous direct current of one voltage class output by the electric power source into the bidirectional pulse direct current of another voltage class, and is electrically connected with the chopper circuit through the isolation device, thereby not only isolating the chopper circuit from the rear end circuit, but also inhibiting the high-frequency noise in the bidirectional pulse direct current, and is respectively electrically connected with the isolation device and the direct current load through two ends of the rectifier circuit, thereby utilizing the rectifier circuit to rectify the bidirectional pulse direct current into stable direct current to supply power to the external direct current load, wherein, the direct current load can be electric farm tools, motors, electric welding, electric vehicles and other electronic equipment with different voltage classes of the electric power source such as power batteries, the tractor not only meets the requirements of working conditions such as traction and power output, but also can provide electric energy for other electric equipment at any time in the field or in the field without a power station so as to be suitable for an electric transmission or pure electric tractor and further increase the practicability of the tractor.

The utility model also provides a tractor, include as above external power supply unit and the electric power source of tractor.

Since the tractor includes the external power supply device of the tractor, the tractor at least has all the beneficial effects of the external power supply device of the tractor, and the detailed description is omitted here.

Drawings

Fig. 1 is a schematic structural diagram of an external power supply device according to an embodiment of the present invention;

fig. 2 is a second schematic structural diagram of an external power supply device according to an embodiment of the present invention;

fig. 3 is a third schematic structural diagram of an external power supply device according to an embodiment of the present invention;

fig. 4 is a fourth schematic structural diagram of an external power supply device according to an embodiment of the present invention.

Description of reference numerals:

1-an electric power source; 2-a chopper circuit; 3-an isolation device; 4-a rectifying circuit; 5-direct current load; 6-a first filter circuit; 7-a second filter circuit; 8-an inverter circuit; 9-alternating current load; 10-an isolated power supply device; 11-a third filter circuit; 12-a first isolated drive device; 13-a second isolated drive device; 14-a first linear regulating device; 15-second linear adjustment means.

Detailed Description

In order to make the aforementioned objects, features and advantages of the present invention more comprehensible, embodiments accompanied with figures are described in detail below.

It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are capable of operation in sequences other than those illustrated or otherwise described herein.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; may be a mechanical connection; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

In the description herein, references to "an embodiment," "one embodiment," and "one implementation," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or implementation is included in at least one embodiment or implementation of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or implementation. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or implementations.

Combine fig. 1 and fig. 2 to show, the embodiment of the utility model provides an external power supply unit of tractor, including DC conversion circuit, DC conversion circuit includes chopper circuit 2, isolation device 3 and rectifier circuit 4, chopper circuit 2's one end is suitable for the electric power source 1 of connecting the tractor, with will the continuous direct current of electric power source 1 output converts the two-way direct current pulse electricity of pulsewidth adjustable into, isolation device 3 with chopper circuit 2's other end electricity is connected, rectifier circuit 4's one end with isolation device 3 connects, rectifier circuit 4's the other end is used for connecting DC load 5, with will two-way direct current pulse rectification forms stable direct current, it is right DC load 5 supplies power.

The dc conversion circuit is used to convert the dc power output by the electric power source 1 of the tractor into dc power of another voltage class, so as to supply power to the external dc load 5. The electric power source 1 comprises a generator set and/or a power battery, and the power battery is a battery pack formed by connecting a plurality of batteries in series, in parallel or in a mixed manner of series and parallel, so that the electric power source 1 can output a relatively high direct-current voltage; the input end of the chopper circuit 2 is used for connecting an electric power source 1 of a tractor, and the output end of the chopper circuit 2 is electrically connected with the isolation device 3, so that continuous direct current output by the electric power source 1 can be converted into bidirectional direct current pulse electricity with adjustable pulse width through the chopper circuit 2 and is transmitted to the isolation device 3; because the dc loads 5 can be electric farm tools, mobile phone batteries, motors, electric welding, electric vehicles, audio players, etc., the dc voltage required by these dc loads 5 is not the same as the voltage level of the electric power source, and the chopper circuit 2 is a dc chopper circuit, mainly chopping the constant dc voltage or current into a series of pulse voltages or currents by fast on-off control of the power electronic switching device, and under the condition of certain filtering, the average value of the voltage or current at the output side of the chopper circuit 2, i.e., the dc loads 5, can be smaller or larger than the voltage or current at the power source end, e.g., the electric power source 1, so the chopper circuit 2 can adjust the voltage level at its output end according to the voltage level of the dc loads 5 to adapt to the external dc loads 5 of different voltage levels. The isolating device 3 is arranged between the chopper circuit 2 and the rectifying circuit 4, the input end and the output end of the isolating device 3 are respectively electrically connected with the output end of the chopper circuit 2 and the input end of the rectifying circuit 4, at the moment, the chopper circuit is isolated from the rear end circuit through the isolating device 3, and high-frequency clutter in the bidirectional direct current pulse can be inhibited, so that a more straight discontinuous square wave such as positive and negative bidirectional pulse direct current is obtained. And the input through rectifier circuit 4 is connected with the output of isolating device 3 electricity, and rectifier circuit 4's output is used for connecting direct current load 5 to carry out the rectification to two-way pulse direct current through rectifier circuit 4, in order to obtain only forward and stable direct current, in order to supply power to direct current load 5, thereby guarantee the stability to direct current load 5 power supplies.

In this embodiment, the chopper circuit 2 may be electrically connected to the electric power source 1 of the tractor to convert the continuous dc power output from the electric power source 1 into a bidirectional dc pulse power with adjustable pulse width, in other words, the chopper module may convert the continuous dc power of one voltage class output from the electric power source 1 into a bidirectional pulse dc power of another voltage class, and is electrically connected to the chopper circuit 2 through the isolation device 3, so as to isolate the chopper circuit from the back-end circuit, and further suppress high-frequency noise in the bidirectional pulse dc power through the isolation device 3, and is electrically connected to the isolation device 3 and the dc load 5 through both ends of the rectifier circuit 4, so that the rectifier circuit 4 rectifies the bidirectional pulse dc power into a stable dc power to supply power to the external dc load 5, wherein the dc load 5 may be an electric farm implement, a tractor, a power supply system, and a power supply system, and a power supply system, and a power supply, Some electronic equipment different with the electric power source such as power battery's voltage rating such as motor, electric welding, electric motor car for the tractor not only satisfies the needs of operating mode such as pulling, power take off, but also can not have the region in power station in field or field to provide the electric energy for other consumer at any time, with be applicable to electric drive or pure electric tractor, and then increase the practicality of tractor. Wherein, the electric transmission mainly adopts the following structure: diesel-generator-converter-motor-mechanical structure; the transmission mode of the pure electric vehicle can refer to the transmission mode of the electric vehicle at the present stage, and the details are not repeated herein.

Wherein, electronic agricultural implement can be for electronic power harrow, electronic turnover plow, electronic seeder etc. do not specifically limit here, and this electronic agricultural implement generally needs DC power supply, is about to the electric power source as the power supply source, can convert the direct current of electric power source output into the stable direct current of other voltages through direct current converting circuit to in order to supply power to electronic agricultural implement. The dc load may also be an electric lifting device, in other words, the working power source of the electric lifting device may be a dc power source, for example, the electric lifting device may be a three-point suspension device, i.e. other objects may be lifted by the electric lifting device.

In an embodiment of the present invention, as shown in fig. 1 and fig. 2, the dc conversion circuit further includes a first filter circuit 6, two ends of the first filter circuit 6 are respectively connected to the electric power source 1 and the chopper circuit 2, so as to filter the continuous direct current outputted by the electric power source 1.

It should be noted that the electric power source 1 includes a generator set, where the generator set includes a diesel engine, a generator and a dc converter, the diesel engine is connected to the generator to generate electricity through the generator and generate ac power, the dc converter is electrically connected to the generator to convert the ac power generated by the generator into dc power through the dc converter, and in a normal working process of the generator, noise and interference are mixed in the generated ac power, so that the dc power output by the dc converter in the electric power source 1 also has noise and interference; the first filter circuit 6 is arranged between the electric power source 1 and the chopper circuit 2, in other words, the input end and the output end of the first filter circuit 6 are respectively electrically connected with the electric power source 1 and the chopper circuit 2, so that clutter and interference in continuous direct current output by the electric power source 1 can be filtered through the first filter circuit 6, and the continuous direct current is ensured to be more straight. The first filter circuit 6 is an LC filter circuit, for example, the LC filter circuit includes an inductor L1 and a capacitor C1, and the specific connection relationship is shown in fig. 2.

In an embodiment of the present invention, as shown in fig. 2, the dc conversion circuit further includes a second filter circuit 7, and two ends of the second filter circuit 7 are electrically connected to the rectifier circuit 4 and the dc load 5, respectively.

It should be noted that the second filter circuit 7 is disposed between the rectifier circuit 4 and the dc load 5, in other words, an input end and an output end of the second filter circuit 7 are electrically connected to the rectifier circuit 4 and the dc load 5, respectively, so as to filter out harmonics in the stable dc power rectified by the rectifier circuit 4 again, so as to make the stable dc power more flat, and in the process of supplying power to the dc load 5, the power supply quality and efficiency can be better improved. Wherein the second filter circuit 7 comprises a capacitor C2.

In one embodiment of the present invention, the electric power source 1 includes a generator set and/or a power battery.

It should be noted that there are at least three power supply modes of the electric power source, the first power source is a generator set, wherein the generator set includes a diesel engine, a generator and a dc converter, the diesel engine is connected to the generator to generate electricity through the generator and generate ac power, the dc converter is electrically connected to the generator to convert the ac power generated by the generator into dc power through the dc converter, and the dc power generated by the generator set is used as the voltage of the input terminal of the chopper circuit 2. Secondly, the electric power source is a power battery, the power battery is a battery pack formed by connecting a plurality of batteries in series, in parallel or in a combination of series and parallel, electricity of the power battery can be sourced from a generator set, the power battery is used as the electric power source, in other words, direct current output by the power battery is used as the voltage of the input end of the chopper circuit 2. Thirdly, the electric power source comprises a generator set and a power battery, namely, the diesel engine is connected with the generator to generate alternating current through the generator, the generator is electrically connected with the input end of the direct current converter, and the input end of the direct current converter is electrically connected with the power battery, so that the direct current converter converts the alternating current output by the generator into direct current and transmits the direct current to the power battery for storage.

In an embodiment of the present invention, the isolation device 3 is an isolation transformer.

Note that, the isolation transformer is denoted by T1; by limiting the isolation device 3 to the isolation transformer, high-frequency clutter in the bidirectional pulse direct current can be suppressed through the isolation transformer, and the respective currents of the primary winding coil and the secondary winding coil of the isolation transformer can be isolated, so that the risk of electric shock is avoided. The isolation transformer is a transformer with an input winding and an output winding electrically isolated, in other words, the primary side and the secondary side of the isolation transformer are electrically and completely insulated, the loop is also isolated, and the characteristic of large high-frequency loss of an iron core of the isolation transformer is utilized, so that high-frequency noise waves are inhibited from being transmitted into a subsequent rectifying circuit 4; in addition, the isolation transformer is also a protection device, can isolate dangerous voltage, can also restrain the electric wire netting noise.

In an embodiment of the present invention, as shown in fig. 2, the external power supply device of the tractor further includes a first isolation driving device 12, the chopper circuit 2 includes a first IGBT module, a second IGBT module, a third IGBT module and a fourth IGBT module, the first IGBT module, the second IGBT module, the third IGBT module and the base of the fourth IGBT module respectively connect with the first isolation driving device 12 electrically, the first IGBT module and the collector of the third IGBT module respectively connect with the positive electrode of the first filter circuit 6 electrically, the emitter of the first IGBT module and the emitter of the third IGBT module respectively connect with the second IGBT module and the collector of the fourth IGBT module electrically, and the emitter of the second IGBT module and the emitter of the fourth IGBT module respectively connect with the negative electrode of the first filter circuit 6 electrically.

The first IGBT module is denoted by Q1, the second IGBT module is denoted by Q2, the third IGBT module is denoted by Q3, and the fourth IGBT module is denoted by Q4; the IGBT module is an insulated gate bipolar transistor, is a composite full-control voltage-driven power semiconductor device consisting of a BJT (bipolar junction transistor) and an MOS (insulated gate field effect transistor), and has the advantages of both high input impedance of an MOSFET (metal-oxide-semiconductor field effect transistor) and low conduction voltage drop of a GTR (thyristor-transistor). The first isolation driving device 12 is electrically connected to the bases of the first IGBT module, the second IGBT module, the third IGBT module, and the fourth IGBT module, so that the first isolation driving device 12 converts continuous direct current into bidirectional direct current pulses with adjustable different pulse widths by controlling the on-off frequencies of the four IGBT modules in the chopper circuit 2 by using a PWM control technique, in other words, the first isolation driving device 12 can control the duty ratios of the four IGBT modules to control the magnitude of the direct current voltage output by the chopper circuit, so as to be suitable for supplying power to direct current loads with different voltage classes, and transmit the power to the isolation device 3; the prior art is that the first isolation driving device 12 drives the on-off frequency of each IGBT module in the chopper circuit 2 to control the voltage at the output end of the chopper circuit, for example, the isolation driving device employs an optocoupler gate driver, which is not specifically limited herein.

In an embodiment of the present invention, as shown in fig. 2, the external power supply device of the tractor further includes a first linear adjusting device 14, and the dc conversion circuit is electrically connected to the first linear adjusting device 14.

It should be noted that the first linear adjusting device 14 and the dc conversion circuit are connected to a control bus (for example, a CAN bus) through an optical fiber signal line, and are used for adjusting the input and output of the dc conversion circuit in real time according to an input command. For example, the first linear adjusting device 14 is electrically connected to the first filter circuit 6, and can collect an overload signal of the first filter circuit 6, where the overload signal is an overcurrent and overvoltage signal; the first linear adjusting device 14 is electrically connected with the first isolation driving device 12, and can perform calculation according to real-time feedback data of current, voltage and the like of the direct current load 5, and send a new adjustment and correction instruction to the first isolation driving device 12, so that the first isolation driving device 12 performs PWM control on the chopper circuit 2; the first linear adjusting device 14 is electrically connected with the second filter circuit 7 or the direct current load 5 to collect current and voltage at the load side, so as to realize real-time monitoring on the output end of the direct current conversion circuit.

In an embodiment of the present invention, as shown in fig. 3 and fig. 4, the external power supply device of the tractor further includes an ac conversion circuit, the ac conversion circuit includes an inverter circuit 8, and two ends of the inverter circuit 8 are respectively used for connecting the electric power source 1 and the ac load 9.

It should be noted that, by disposing the inverter circuit 8 between the electric power source 1 and the ac load 9, for example, the input end of the inverter circuit 8 is electrically connected to the electric power source 1, and the output end of the inverter circuit 8 is used for connecting the ac load 9, so that the continuous dc power output by the electric power source 1 can be converted into ac power by the inverter circuit 8 to supply power to the ac load 9, and thus the tractor can supply power not only to the dc load 5, but also to the ac load 9, and the practicability of the tractor is further increased. For example, when the electric power source is the generating set, and the tractor is in normal course of operation, generating set's work can continuously produce the direct current this moment, supplies power for direct current load 5 and alternating current load 9 respectively through direct current converting circuit and alternating current converting circuit again to not only do not influence the normal work of tractor, can also supply power for other external loads through direct current converting circuit and alternating current converting circuit, in order to improve tractor's practicality greatly. When the electric power source is power battery, the tractor is in normal course of operation or in the shutdown state, the power battery of tractor this moment can the steady output direct current, supply power for direct current load 5 and alternating current load 9 respectively through direct current converting circuit and alternating current converting circuit again, thereby need not to start the tractor, with the energy consumption that reduces generating set, not only reduce diesel engine's diesel oil cost, can also supply power for other external load through direct current converting circuit and alternating current converting circuit, with the practicality that improves the tractor greatly. The ac load 9 may be a lighting lamp, an electric maintenance tool, a winch, an electric farm implement requiring ac power, an electric lifting device, and the like, and is not particularly limited herein.

In addition, the inverter circuit 8 includes 6 IGBT modules, namely, a fifth IGBT module, a sixth IGBT module, a seventh IGBT module, an eighth IGBT module, a ninth IGBT module, and a tenth IGBT module, wherein the fifth IGBT module is denoted by Q5, the sixth IGBT module is denoted by Q6, the seventh IGBT module is denoted by Q7, the eighth IGBT module is denoted by Q8, the ninth IGBT module is denoted by Q9, the tenth IGBT module is denoted by Q10, and the six IGBT modules are divided into three groups to convert the continuous direct current of the electric power source 1 into three-phase alternating current, thereby realizing the power supply to the alternating current load 9, for example, the three-phase alternating current load. The multi-level inverter circuit 8 can reduce the on-off frequency of each IGBT module, and energy loss is reduced.

In an embodiment of the present invention, as shown in fig. 3 and fig. 4, the ac converting circuit further includes an isolation power device 10, and two ends of the isolation power device 10 are electrically connected to the inverter circuit 8 and the ac load 9, respectively.

It should be noted that, by providing the isolation power device 10 between the inverter circuit 8 and the ac load 9, for example, the input end and the output end of the isolation power device 10 are electrically connected to the inverter circuit 8 and the ac load 9, so that the isolation power device 10 can isolate the circuits or devices at the input end and the output end of the isolation power device 10 to protect the subsequent load and improve the anti-interference capability. The isolation power device 10 is denoted by T2, and the isolation power device 10 may adopt two ways of magnetic isolation or magnetic isolation and optoelectronic isolation, which are not specifically limited herein, and the isolation power device 10 may be an isolation transformer, denoted by T2, as shown in fig. 4. In addition, an isolating switch is further arranged between the output end of the isolating power supply device 10 and the alternating current load, the isolating switch is marked by QS, the on or off of the alternating current load can be controlled through the on or off of the isolating switch, and the voltage on the wire inlet side of the isolating switch can be completely disconnected relative to other types of switches in the off state, so that electric shock accidents cannot occur when the alternating current load is connected or maintained.

In an embodiment of the present invention, as shown in fig. 3 and fig. 4, the ac converting circuit further includes a third filter circuit 11, two ends of the third filter circuit 11 are respectively electrically connected to the inverter circuit 8 and the isolated power device 10, so as to filter the three-phase ac output by the inverter circuit 8.

It should be noted that the third filter circuit 11 is disposed between the inverter circuit 8 and the isolation power device 10, that is, the input end and the output end of the third filter circuit 11 are respectively electrically connected to the inverter circuit 8 and the isolation power device 10, so as to filter the three-phase alternating current output by the inverter circuit 8 through the third filter circuit 11, so as to not only filter noise and interference in the three-phase alternating current, but also convert the PWM pulse wave in the inverter circuit 8 into a smooth sine wave curve.

The third filter circuit 11 includes an inductance component and a capacitor bank, wherein the inductance component includes three inductances L2, the three inductances L2 are respectively connected to the three-phase power output by the inverter circuit 8, and the capacitor bank includes three capacitors C4 electrically connected to each other.

In an embodiment of the present invention, the ac converting circuit includes a second isolation driving device 13, and the second isolation driving device 13 is electrically connected to the inverter circuit 8 to control the output of the inverter circuit 8.

It should be noted that, because the inverter circuit 8 includes six IGBT modules, and the second isolation driving device 13 is electrically connected to the base electrodes of the six IGBT modules in the inverter circuit 8, the second isolation driving device 13 controls the on-off frequency of the six IGBT modules by using the PWM control technique, so as to modulate the output pulse width, and convert the input direct current into a three-phase pulse sequence with different widths.

In an embodiment of the present invention, as shown in fig. 4, the external power supply device of the tractor further includes a second linear adjusting device 15, and the ac converting circuit is electrically connected to the second linear adjusting device 15.

It should be noted that the second linear adjusting device 15 and the ac converting circuit are connected to a control bus (for example, CAN bus) through an optical fiber signal line, and are used for adjusting the input and output of the ac converting circuit in real time according to an input instruction. For example, the second linear adjusting device 15 is electrically connected to the isolated power supply device 10 or the ac load 9, and can collect current, voltage feedback information and operation state of the ac load 9; the second linear adjusting device 15 is electrically connected with the inverter circuit 8, so that the second linear adjusting device 15 continuously calculates the deviation between the instruction and the feedback according to the real-time feedback data of the current and the voltage of the alternating current load 9, sends a new adjusting and correcting instruction to the second isolation driving device 13 in real time, and controls the output of the alternating current change circuit by the second isolation driving device 13 until the instruction and the feedback are error-free, thereby realizing linear closed-loop control; in addition, since the second linear adjustment device 15 CAN send a power increase or decrease request and a system operation state through the CAN bus, it is the prior art to control the on-off frequency of the IGBT module in the inverter by using the PWM technique through the isolation driving device to realize the voltage control of the output end of the inverter circuit 8, and therefore, no further description is given here.

Another embodiment of the present invention provides a tractor, which comprises the external power supply device and the electric power source 1 of the tractor according to the above embodiments.

The tractor is provided with the electric power source 1 for supplying direct current to the tractor or an external direct current load, and the tractor can perform mobile operation, and can also supply power to the direct current load 5 through the direct current conversion circuit and supply power to the alternating current load 9 through the alternating current conversion circuit.

Although the present disclosure has been described above, the scope of the present disclosure is not limited thereto. Various changes and modifications may be made by those skilled in the art without departing from the spirit and scope of the present disclosure, and these changes and modifications are intended to fall within the scope of the present disclosure.

Claims (10)

1. The external power supply device of the tractor is characterized by comprising a direct current conversion circuit, wherein the direct current conversion circuit comprises a chopper circuit (2), an isolation device (3) and a rectification circuit (4), the chopper circuit (2) is suitable for being connected with an electric power source (1) of the tractor to convert continuous direct current output by the electric power source (1) into bidirectional direct current pulse power with adjustable pulse width, the isolation device (3) is electrically connected with the chopper circuit (2), one end of the rectification circuit (4) is connected with the isolation device (3), and the other end of the rectification circuit (4) is used for being connected with a direct current load (5) to rectify the bidirectional direct current pulse to form stable direct current so as to supply power to the direct current load (5).

2. An external power supply device for tractors according to claim 1, wherein the dc conversion circuit further comprises a first filter circuit (6), and two ends of the first filter circuit (6) are electrically connected to the electric power source (1) and the chopper circuit (2) respectively, so as to filter the continuous dc power output by the electric power source (1).

3. An external power supply device for tractor according to claim 1, wherein said dc conversion circuit further comprises a second filter circuit (7), and two ends of said second filter circuit (7) are electrically connected to said rectifier circuit (4) and said dc load (5), respectively.

4. An external power supply device for tractors according to claim 1, wherein said electric power source (1) comprises a generator set and/or a power battery.

5. An external power supply device for tractor according to claim 2, further comprising a first isolation driving means (12), the chopper circuit (2) includes a first IGBT module, a second IGBT module, a third IGBT module, and a fourth IGBT module, the bases of the first IGBT module, the second IGBT module, the third IGBT module and the fourth IGBT module are respectively and electrically connected with the first isolation driving device (12), the collectors of the first IGBT module and the third IGBT module are respectively electrically connected with the anode of the first filter circuit (6), the emitters of the first IGBT module and the third IGBT module are respectively and electrically connected with the collectors of the second IGBT module and the fourth IGBT module, the emitting electrodes of the second IGBT module and the fourth IGBT module are respectively electrically connected with the negative electrode of the first filter circuit (6).

6. An external power supply device for tractor according to any claim 1 to 5, further comprising an AC conversion circuit, wherein the AC conversion circuit comprises an inverter circuit (8), and two ends of the inverter circuit (8) are respectively used for connecting the electric power source (1) and an AC load (9).

7. An external power supply device for tractor according to claim 6, wherein said ac conversion circuit further comprises an isolation power supply device (10), and two ends of said isolation power supply device (10) are electrically connected to said inverter circuit (8) and said ac load (9), respectively.

8. External power supply device for tractor according to claim 7, characterized in that said ac conversion circuit further comprises a third filter circuit (11), and two ends of said third filter circuit (11) are respectively electrically connected to said inverter circuit (8) and said isolated power device (10) for filtering the three-phase ac power outputted by said inverter circuit (8).

9. An external power supply device for tractor according to claim 6, wherein said ac conversion circuit includes a second isolation driving device (13), said second isolation driving device (13) is electrically connected with said inverter circuit (8) to control the output of the inverter circuit (8).

10. A tractor characterized by comprising an external power supply device of a tractor according to any one of claims 1 to 9 and an electric power source (1).

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