Pre-charging control unit, control method and crane

Abstract

The invention discloses a pre-charging control unit, a pre-charging control method and a crane. The pre-charging control unit comprises a branch I, a branch II, a branch III, a fourth contactor, a pre-charging controller and a pre-charging resistor, the pre-charging controller comprises a pre-charging control circuit, a high-voltage detection circuit and a high-voltage pre-charging main circuit; judging whether the first contactor, the second contactor, the third contactor and the fourth contactor are abnormal or not by using a high-voltage detection circuit; when it is judged that the first contactor, the second contactor, the third contactor and the fourth contactor are all in a normal state, the first contactor, the second contactor, the third contactor and the fourth contactor are powered on according to the first branch power-on instruction, the second branch power-on instruction or the third branch power-on instruction; the high-voltage pre-charging main circuit, the high-voltage detection circuit, the pre-charging control circuit, the pre-charging resistor, the first contactor, the second contactor and the third contactor are matched to pre-charge the first branch circuit, the second branch circuit or the third branch circuit. One pre-charging resistor is used for providing pre-charging for motor electric control under three different working conditions, and the use efficiency of the pre-charging resistor is improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of engineering machinery, and in particular relates to a pre-charging control unit, a control method and a crane. Background Art

[0002] With the rapid development of battery electronic control technology, it has been widely used in motor vehicles. The crane industry has also kept up with the industry development trend and actively developed new energy cranes. In recent years, many types of new energy cranes have appeared on the market, but their overall upper and lower high voltage technology follows the electrification technology of passenger cars and commercial vehicles. The existing new energy crane high voltage pre-charging principle is as follows: Figure 1 As shown, the high-voltage distribution unit of the whole vehicle is provided with a main negative contactor, and each branch supplies power to the relevant electrical equipment respectively. Each branch is provided with a positive contactor on the positive circuit, and a pre-charging circuit consisting of a pre-charging resistor, a pre-charging contactor and a wiring harness is separately provided. After the high voltage of the whole vehicle is powered on and the main negative contactor is closed, each branch controls its corresponding pre-charging circuit to complete the pre-charging and close the positive contactor according to work needs. It can be seen that the existing technical solution requires the use of multiple pre-charging resistors and control circuits, which are arranged in a scattered manner and have a low degree of integration. The distribution unit needs to occupy a large space, which is not conducive to the layout of the whole vehicle. At the same time, the utilization rate of the pre-charging resistor and the pre-charging switch is low, resulting in a waste of resources and high cost.

[0003] In order to reduce the number of pre-charge resistors, the Chinese invention patent application with publication number CN117811162A, for example Figure 2 As shown, it is proposed to use a pre-charge circuit and two charge and discharge branches in parallel, and to add a pre-charge sub-switch between the pre-charge circuit and the discharge circuit to solve the problem of high cost caused by the presence of two pre-charge circuits in the existing charge and discharge circuit. Although this solution can pre-charge different branches with a single pre-charge resistor, it can only pre-charge two branches. When pre-charging the charging branch, the pre-charge sub-switch needs to be closed, which will inevitably pre-charge the discharge branch at the same time, increasing the pre-charge current and pre-charge time. Summary of the Invention

[0004] In response to the above problems, the present invention proposes a pre-charging control unit, a control method and a crane. While meeting the requirements for safe power on and off of the motors and electronic controls of the new energy crane, one pre-charging resistor is used to provide pre-charging for the motors and electronic controls of three different working conditions, thereby improving the efficiency of the pre-charging resistors. Reducing the number of pre-charging resistors can also reduce the pre-charging cost, improve the integration of the pre-charging circuit, improve the integration of high-voltage electrical equipment, reduce the equipment volume, and facilitate the layout of the entire vehicle.

[0005] In order to achieve the above technical objectives and the above technical effects, the present invention is implemented through the following technical solutions: In a first aspect, the present invention provides a pre-charge control unit, comprising: branch one, branch two, branch three, a fourth contactor, a pre-charge controller, and a pre-charge resistor; The branch 1, branch 2 and branch 3 are arranged in parallel and connected in series with the fourth contactor and the external power supply; A first contactor, a second contactor and a third contactor are respectively provided between the two ends of the branch 1, the branch 2 and the branch 3; The pre-charge controller includes a pre-charge control circuit, a high-voltage detection circuit and a high-voltage pre-charge main circuit; the output end of the pre-charge control circuit is respectively connected to the control end of the high-voltage pre-charge main circuit, the first contactor, the second contactor, the third contactor and the fourth contactor; the input end of the high-voltage pre-charge main circuit is connected to the first end of the pre-charge resistor and the input end of the high-voltage detection circuit, and its output end is respectively connected to the second end of branch one, branch two and branch three; the second end of the pre-charge resistor is respectively connected to the first end of branch one, branch two and branch three, and the input end of the high-voltage detection circuit; the input end of the high-voltage detection circuit is also respectively connected to the two ends of the fourth contactor and the output end of the high-voltage pre-charge main circuit.

[0006] In combination with the first aspect, optionally, the high-voltage pre-charge main circuit includes a first high-voltage pre-charge switch D1, a second high-voltage pre-charge switch D2, and a third high-voltage pre-charge switch D3 arranged in parallel; The positive electrodes of the first high-voltage pre-charge switch D1, the second high-voltage pre-charge switch D2 and the third high-voltage pre-charge switch D3 are connected to the first end of the pre-charge resistor; The cathodes of the first high-voltage pre-charge switch D1, the second high-voltage pre-charge switch D2, and the third high-voltage pre-charge switch D3 are connected to the second ends of branch 1, branch 2, and branch 3, respectively; The positive and negative electrodes of the first high-voltage pre-charge switch D1 , the second high-voltage pre-charge switch D2 and the third high-voltage pre-charge switch D3 are each provided with a state measurement point, and each state measurement point is connected to the input end of the high-voltage detection circuit.

[0007] In combination with the first aspect, optionally, the pre-charge control circuit includes a first pre-charge control switch K1, a second pre-charge control switch K2, a third pre-charge control switch K3, a fourth pre-charge control switch K4, a fifth pre-charge control switch K5, a sixth pre-charge control switch K6 and a seventh pre-charge control switch K7; The first pre-charge control switch K1 and the third pre-charge control switch K3 each have three ports, defined as com, NC, and NO, respectively, where com is a common input terminal, NC is a normally closed output terminal, and NO is a normally open output terminal; The second pre-charge control switch K2 includes two ports, which are defined as a com terminal and a NO terminal, wherein the com terminal is an input terminal and the NO terminal is an output terminal; The NC terminal of the first pre-fill control switch K1 is connected to the com terminal of the second pre-fill control switch K2, and the NO terminal of the first pre-fill control switch K1 is connected to the com terminal of the third pre-fill control switch K3; the com terminal of the first pre-fill control switch K1 is the total input terminal VCC of the pre-fill control circuit, which is used to connect to a power supply; the NO terminal of the second pre-fill control switch K2 is the output terminal DO1 of the pre-fill control circuit, the NC terminal of the third pre-fill control switch K3 is the output terminal DO2 of the pre-fill control circuit, and the NO terminal of the third pre-fill control switch K3 is the output terminal DO3 of the pre-fill control circuit; the output terminals DO1, DO2, and DO3 are respectively connected to the control terminals of the first high-voltage pre-fill switch D1, the second high-voltage pre-fill switch D2, and the third high-voltage pre-fill switch D3; The fourth pre-charge control switch K4, the fifth pre-charge control switch K5, the sixth pre-charge control switch K6 and the seventh pre-charge control switch K7 each include two ports, respectively defined as a com terminal and an NO terminal, wherein the com terminal is an input terminal for connecting to a power supply; the NO terminal is an output terminal for connecting to the control terminals of the fourth contactor, the third contactor, the second contactor and the first contactor, respectively; The NO terminal of the fourth pre-charge control switch K4 is D04; The NO terminal of the fifth pre-charge control switch K5 is D05; The NO terminal of the sixth pre-charge control switch K6 is D06; The NO terminal of the seventh pre-charge control switch K7 is D07.

[0008] In combination with the first aspect, optionally, the high-voltage detection circuit includes a first detection sub-circuit HVAI1, a second detection sub-circuit HVAI2, a third detection sub-circuit HVAI3, a fourth detection sub-circuit HVAI4, a fifth detection sub-circuit HVAI5, a sixth detection sub-circuit HVAI6, and a seventh detection sub-circuit HVAI7 arranged in parallel; The first detection sub-circuit HVAI1 is connected to a measurement point JC1 at the positive electrode of the first high-voltage pre-charge switch D1; The second detection sub-circuit HVAI2 is connected to the measurement point JC2 at the negative electrode of the first high-voltage pre-charge switch D1; The third detection sub-circuit HVAI3 is connected to the measurement point JC3 at the negative electrode of the second high-voltage pre-charge switch D2; The fourth detection sub-circuit HVAI4 is connected to the measurement point JC4 at the negative electrode of the third high-voltage pre-charge switch D3; The fifth detection sub-circuit HVAI5 and the seventh detection sub-circuit HVAI7 are respectively connected to the measurement points JC5 and JC7 at both ends of the fourth contactor; The sixth detection sub-circuit HVAI6 is connected to a measurement point JC6 at the second end of the pre-charging resistor.

[0009] In combination with the first aspect, optionally, the high-voltage detection circuit determines whether the voltage values between the measuring points JC5 and JC2, JC3, and JC4 are consistent to determine whether the corresponding high-voltage pre-charge switch state is abnormal. At the same time, the high-voltage detection circuit determines whether the voltage values between the measuring points JC1 and JC2, JC3, and JC4 are consistent to determine whether the first contactor, the second contactor, and the third contactor are abnormal. The high-voltage detection circuit determines whether the voltage values between the measuring points JC5 and JC7 are consistent to determine whether the fourth contactor is abnormal.

[0010] In combination with the first aspect, optionally, when receiving the power-on instruction of branch one, the pre-charge controller first enables the fourth pre-charge control switch K4, outputs the voltage through the output terminal DO4 to close the fourth contactor KM4, and then determines whether the fourth contactor KM4 is closed by comparing whether the voltage values of the measuring points JC5 and JC7 are consistent. After the fourth contactor KM4 is closed, the pre-charge controller controls the first high-voltage pre-charge switch D1 connected to branch one to turn on by enabling the second pre-charge control switch K2, and connects the pre-charge resistor R in parallel to branch one to pre-charge branch one; at the same time, the pre-charge controller The controller determines whether the pre-charging is completed by comparing the voltage values between the measuring points JC2 and JC6. When the ratio of the voltage value at the measuring point JC2 to the voltage value at the measuring point JC6 is greater than the set threshold, the pre-charging is completed. After the pre-charging is completed, the pre-charging controller controls the first contactor KM1 of branch one by enabling the seventh pre-charging control switch K7 to close, and then controls the first high-voltage pre-charging switch D1 to open by disconnecting the second pre-charging control switch K2, thereby disconnecting the pre-charging resistor R from branch one. If the pre-charging voltage does not reach the pre-charging set voltage value when the pre-charging set time is reached, the pre-charging fails and the pre-charging is terminated.

[0011] In combination with the first aspect, optionally, when receiving a power-on instruction for branch two, the pre-charge controller first enables the fourth pre-charge control switch K4, outputs a voltage through the output terminal DO4 to close the fourth contactor KM4, and then determines whether the contactor KM4 is closed by comparing whether the voltage values at the measurement points JC5 and JC7 are consistent. After the fourth contactor KM4 is closed, the pre-charge controller enables the switching action of the first pre-charge control switch K1 to turn on its NO terminal, thereby controlling the second high-voltage pre-charge switch D2 connected to branch two to turn on, and connecting the pre-charge resistor R in parallel to branch two to pre-charge branch two; At the same time, the pre-charging controller determines whether the pre-charging is completed by comparing the voltage values between the measuring points JC3 and JC6. When the ratio of the voltage value at the measuring point JC3 to the voltage value at JC6 is greater than the set threshold, the pre-charging is completed. After the pre-charging is completed, the pre-charging controller controls the second contactor KM2 of branch two by enabling the sixth pre-charging control switch K6 to close, and then controls the second high-voltage pre-charging switch D2 to disconnect by disconnecting the first pre-charging control switch K1, thereby disconnecting the pre-charging resistor R from branch two. If the pre-charging voltage does not reach the pre-charging set voltage value when the pre-charging set time is reached, the pre-charging fails and the pre-charging is terminated.

[0012] In combination with the first aspect, optionally, when receiving the power-on instruction of branch three, the pre-charge controller first enables the fourth pre-charge control switch K4, outputs the voltage through the output terminal DO4 to close the fourth contactor KM4, and then determines whether the fourth contactor KM4 is closed by comparing whether the voltage values of the measuring points JC5 and JC7 are consistent; after the fourth contactor KM4 is closed, the pre-charge controller first controls the switching action of the third pre-charge control switch K3 of the pre-charge control circuit to turn on its NO terminal, and then controls the first pre-charge control switch K1 to turn on its NO terminal, thereby controlling the third high-voltage pre-charge switch D3 connected to branch three to turn on, and connecting the pre-charge resistor R in parallel to branch three, Branch three is pre-charged; at the same time, the pre-charge controller determines whether the pre-charge is completed by comparing the voltage values between the measuring points JC4 and JC6. When the ratio of the voltage value at the measuring point JC4 to the voltage value at JC6 is greater than the set threshold, the pre-charge is completed. After the pre-charge is completed, the pre-charge controller controls the third contactor KM3 in branch three by enabling the fifth pre-charge control switch K5 to close, and then controls the third high-voltage pre-charge switch D3 to disconnect by first closing the first pre-charge control switch K1 and then closing the third pre-charge control switch K3, thereby disconnecting the pre-charge resistor R from branch three. If the pre-charge voltage does not reach the pre-charge set voltage value when the pre-charge set time is reached, the pre-charge fails and the pre-charge is terminated.

[0013] In a second aspect, the present invention provides a pre-fill control method applicable to the pre-fill control unit according to any one of the first aspects, comprising: Using a high voltage detection circuit to determine whether the first contactor, the second contactor, the third contactor, and the fourth contactor are abnormal; When it is determined that the first contactor, the second contactor, the third contactor and the fourth contactor are all in normal state, according to the power-on instruction of branch one, the power-on instruction of branch two or the power-on instruction of branch three, the high-voltage pre-charging main circuit, the high-voltage detection circuit, the pre-charging control circuit, the pre-charging resistor, the first contactor, the second contactor and the third contactor are coordinated to pre-charge branch one, branch two or branch three.

[0014] In a third aspect, the present invention provides a crane comprising the pre-charge control unit described in any one of the first aspects.

[0015] Compared with the prior art, the present invention has the following beneficial effects: The present invention proposes a pre-charging control unit, a control method, and a crane. While meeting the requirements for safe power on and off of the motors and electronic controls of new energy cranes, one pre-charging resistor is used to provide pre-charging for the motors and electronic controls of three different working conditions, thereby improving the efficiency of the pre-charging resistors. Reducing the number of pre-charging resistors can also reduce the pre-charging cost, improve the integration of the pre-charging circuit, improve the integration of high-voltage electrical equipment, reduce the equipment volume, and facilitate the layout of the entire vehicle.

[0016] In the present invention, the pre-charging control circuit, the high-voltage detection circuit and the high-voltage pre-charging main circuit are integrated into a pre-charging controller, thereby improving the integration of the pre-charging circuit, effectively reducing the layout space and wiring in the high-voltage distribution unit box, and reducing the volume of the high-voltage distribution unit. This is not only beneficial to the integration of the high-voltage distribution unit and other high-voltage equipment, improving the reliability of assembly, but also convenient for the layout of the entire vehicle.

[0017] The pre-charge controller in the present invention realizes the pre-charging of multiple branch motor electronic controls with only one pre-charge resistor through the reasonable setting of the high-voltage pre-charge main circuit and the interlocking design of the pre-charge control circuit, greatly reducing the number of pre-charge resistors used, improving the efficiency of pre-charge resistor use, and helping to reduce costs.

[0018] The pre-charge controller in the present invention can also complete the pre-charge control of more branches by expanding the number of control points, the number of pre-charge main circuits and the number of detection circuit measurement points, and can support the completion of the power-on and power-off control of high-voltage circuits that do not require pre-charging, thereby completing the power-on and power-off control of all high-voltage circuits in the entire vehicle. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. Those skilled in the art can also derive other drawings based on these drawings without inventive work, among which: Figure 1 This is a schematic diagram of the high-voltage pre-charging principle of an existing new energy crane in the prior art; Figure 2 A circuit diagram of the technical solution in the Chinese invention patent application with publication number CN117811162A; Figure 3 A schematic diagram of a pre-charge controller according to an embodiment of the present invention; Figure 4 A circuit diagram of a pre-charge control unit according to an embodiment of the present invention; Figure 5 A circuit diagram of a high-voltage pre-charge main circuit according to an embodiment of the present invention; Figure 6 A circuit diagram of a precharge control circuit according to an embodiment of the present invention; Figure 7 A circuit diagram of a precharge controller according to an embodiment of the present invention; Figure 8 The figure is a flow chart of a pre-charge control method according to an embodiment of the present invention. DETAILED DESCRIPTION

[0020] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0021] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features specified as "first" and "second" may explicitly or implicitly include at least one of such features. In addition, the technical solutions between the various embodiments can be combined with each other, but this must be based on the fact that ordinary technicians in this field can implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention. Example 1

[0022] like Figure 4 and 7 As shown, an embodiment of the present invention provides a pre-charge control unit, including: branch 1 (i.e. Figure 4 Branch 1), Branch 2 (i.e. Figure 4 Branch 2 in the middle), Branch 3 (i.e. Figure 4Branch 3 in), the fourth contactor KM4 (i.e. the main negative contactor), the pre-charge controller and the pre-charge resistor R; The branch 1, branch 2 and branch 3 are arranged in parallel and connected in series with the fourth contactor KM4 and the external power supply; A first contactor KM1, a second contactor KM2 and a third contactor KM3 are respectively provided between the two ends of the branch 1, the branch 2 and the branch 3; The pre-charge controller includes a pre-charge control circuit, a high-voltage detection circuit and a high-voltage pre-charge main circuit; the output end of the pre-charge control circuit is respectively connected to the control end of the high-voltage pre-charge main circuit, the first contactor KM1, the second contactor KM2, the third contactor KM3 and the fourth contactor KM4; the input end of the high-voltage pre-charge main circuit is connected to the first end of the pre-charge resistor R and the input end of the high-voltage detection circuit, and its output end is respectively connected to the second end of the branch one, branch two and branch three; the second end of the pre-charge resistor R is respectively connected to the first end of the branch one, branch two and branch three, and the input end of the high-voltage detection circuit; the input end of the high-voltage detection circuit is also respectively connected to the two ends of the fourth contactor KM4 and the output end of the high-voltage pre-charge main circuit. In the specific implementation process, the pre-charge controller is placed in the high-voltage power distribution unit as a part of the pre-charge control unit, which is used to complete the pre-charge power-on control of each branch.

[0023] In the above solution, while meeting the requirements for safe power on and off of the motors and electronic controls of the new energy crane, a pre-charging resistor is used to provide pre-charging for the motors and electronic controls of three different working conditions, thereby improving the efficiency of the pre-charging resistor. Reducing the number of pre-charging resistors can also reduce the pre-charging cost, improve the integration of the pre-charging circuit, improve the integration of high-voltage electrical equipment, reduce the equipment size, and facilitate the layout of the entire vehicle.

[0024] like Figure 3 As shown, the high-voltage detection circuit in the embodiment of the present invention mainly detects each measurement point, and the detection value of the high-voltage detection circuit is collected by the auxiliary control circuit. The auxiliary control circuit is used for the work control of the pre-charge controller itself, the communication processing between the pre-charge controller and other external devices, etc.

[0025] In a specific implementation of the embodiment of the present invention, Figure 5 As shown, the high-voltage pre-charge main circuit includes a first high-voltage pre-charge switch D1, a second high-voltage pre-charge switch D2 and a third high-voltage pre-charge switch D3 arranged in parallel; The positive electrodes of the first high-voltage pre-charge switch D1, the second high-voltage pre-charge switch D2, and the third high-voltage pre-charge switch D3 are connected to each other and then connected to the first end of the pre-charge resistor R; the positive electrodes of the first high-voltage pre-charge switch D1, the second high-voltage pre-charge switch D2, and the third high-voltage pre-charge switch D3 are connected to form the input port HV1 of the high-voltage pre-charge main circuit; The cathodes of the first high-voltage pre-charge switch D1, the second high-voltage pre-charge switch D2, and the third high-voltage pre-charge switch D3 are connected to the second ends of branch one, branch two, and branch three, respectively; the cathodes of the first high-voltage pre-charge switch D1, the second high-voltage pre-charge switch D2, and the third high-voltage pre-charge switch D3 serve as the output ends of the respective high-voltage pre-charge switches. Therefore, the output ends of the first high-voltage pre-charge switch D1, the second high-voltage pre-charge switch D2, and the third high-voltage pre-charge switch D3 are HV2, HV3, and HV4, respectively, for connecting to branch one, branch two, and branch three; The positive and negative electrodes of the first high-voltage pre-charge switch D1, the second high-voltage pre-charge switch D2 and the third high-voltage pre-charge switch D3 are each provided with a state measurement point (JC1, JC2, JC3 and JC4), and each state measurement point is connected to the input end of the high-voltage detection circuit.

[0026] In the above scheme, it is proposed that the high-voltage pre-charge main circuit includes a first high-voltage pre-charge switch D1, a second high-voltage pre-charge switch D2 and a third high-voltage pre-charge switch D3 arranged in parallel, and the connection relationship between them, as well as the connection relationship between them and the pre-charge resistor, branch one, branch two, branch three and the high-voltage detection circuit are specifically defined to facilitate later implementation.

[0027] In a specific implementation of the embodiment of the present invention, Figure 6 As shown, the pre-charge control circuit includes a first pre-charge control switch K1, a second pre-charge control switch K2, a third pre-charge control switch K3, a fourth pre-charge control switch K4, a fifth pre-charge control switch K5, a sixth pre-charge control switch K6 and a seventh pre-charge control switch K7; The first pre-charge control switch K1 and the third pre-charge control switch K3 each have three ports, defined as com, NC, and NO, respectively, where com is a common input terminal, NC is a normally closed output terminal, and NO is a normally open output terminal; The second pre-charge control switch K2 includes two ports, which are defined as a com terminal and a NO terminal, wherein the com terminal is an input terminal and the NO terminal is an output terminal; The NC terminal of the first pre-charge control switch K1 is connected to the com terminal of the second pre-charge control switch K2, and the NO terminal of the first pre-charge control switch K1 is connected to the com terminal of the third pre-charge control switch K3; the com terminal of the first pre-charge control switch K1 is the total input terminal VCC of the pre-charge control circuit, which is used to connect to a power supply; the NO terminal of the second pre-charge control switch K2 is the output terminal DO1 of the pre-charge control circuit, the NC terminal of the third pre-charge control switch K3 is the output terminal DO2 of the pre-charge control circuit, and the NO terminal of the third pre-charge control switch K3 is the output terminal DO3 of the pre-charge control circuit; the output terminals DO1, DO2, and DO3 are connected to the control terminals (KZ1, KZ2, and KZ3) of the first high-voltage pre-charge switch D1, the second high-voltage pre-charge switch D2, and the third high-voltage pre-charge switch D3, respectively; The fourth pre-fill control switch K4, the fifth pre-fill control switch K5, the sixth pre-fill control switch K6 and the seventh pre-fill control switch K7 each include two ports, defined as a com terminal and a NO terminal, wherein the com terminal is an input terminal for connecting to a power supply; the NO terminal is an output terminal; The NO terminal of the fourth pre-charge control switch K4 is D04, which is connected to the control terminal of the fourth contactor KM4; The NO terminal of the fifth pre-charge control switch K5 is D05, which is connected to the control terminal of the third contactor KM3; The NO terminal of the sixth pre-charge control switch K6 is D06, which is connected to the control terminal of the second contactor KM2; The NO terminal of the seventh pre-charge control switch K7 is D07, which is connected to the control terminal of the first contactor KM1.

[0028] In the above scheme, it is proposed that the pre-charge control circuit includes a first pre-charge control switch K1, a second pre-charge control switch K2, a third pre-charge control switch K3, a fourth pre-charge control switch K4, a fifth pre-charge control switch K5, a sixth pre-charge control switch K6 and a seventh pre-charge control switch K7, and the connection relationship between them, as well as the connection relationship between them and the first contactor KM1, the second contactor KM2, the third contactor KM3 and the fourth contactor KM4 are specifically defined to facilitate later implementation.

[0029] In a specific implementation of the embodiment of the present invention, Figure 7 As shown, the high-voltage detection circuit includes a first detection sub-circuit HVAI1, a second detection sub-circuit HVAI2, a third detection sub-circuit HVAI3, a fourth detection sub-circuit HVAI4, a fifth detection sub-circuit HVAI5, a sixth detection sub-circuit HVAI6 and a seventh detection sub-circuit HVAI7 arranged in parallel; The first detection sub-circuit HVAI1 is connected to a measurement point JC1 at the positive electrode of the first high-voltage pre-charge switch D1; The second detection sub-circuit HVAI2 is connected to the measurement point JC2 at the negative electrode of the first high-voltage pre-charge switch D1; The third detection sub-circuit HVAI3 is connected to the measurement point JC3 at the negative electrode of the second high-voltage pre-charge switch D2; The fourth detection sub-circuit HVAI4 is connected to the measurement point JC4 at the negative electrode of the third high-voltage pre-charge switch D3; The fifth detection subcircuit HVAI5 and the seventh detection subcircuit HVAI7 are respectively connected to the measurement points JC5 and JC7 at both ends of the fourth contactor; in actual application of this process, the fifth detection subcircuit HVAI5 is used to connect the negative electrode of the pre-charge control unit as a measurement reference voltage; The sixth detection sub-circuit HVAI6 is connected to the measurement point JC6 at the second end of the pre-charging resistor; in actual application, the sixth detection sub-circuit HVAI6 is used to connect the positive pole of the pre-charging control unit to detect the bus voltage.

[0030] The above scheme points out that the high-voltage detection circuit includes a first detection sub-circuit HVAI1, a second detection sub-circuit HVAI2, a third detection sub-circuit HVAI3, a fourth detection sub-circuit HVAI4, a fifth detection sub-circuit HVAI5, a sixth detection sub-circuit HVAI6 and a seventh detection sub-circuit HVAI7 arranged in parallel, and the connection relationship between them, as well as the connection relationship between them and the first high-voltage pre-charge switch D1, the second high-voltage pre-charge switch D2, the third high-voltage pre-charge switch D3, the fourth contactor KM4 and the pre-charge resistor R are specifically defined to facilitate later implementation.

[0031] As can be seen from the above, the external ports of the pre-charge controller include measurement interfaces HVAI5, HVAI6, and HVAI7, control interfaces DO4, DO5, DO6, DO7, and pre-charge interfaces HV1, HV2, HV3, and HV4. Through the circuit ports set by the pre-charge controller, the pre-charge controller and the high-voltage circuits that need to be pre-charged in the vehicle's high-voltage distribution unit and the pre-charge resistor R are connected together to form a pre-charge control unit.

[0032] When a new energy crane needs to be powered on, the vehicle controller issues a power-on command to one or several branches as needed. After receiving the power-on command, the pre-charge controller controls the corresponding high-voltage pre-charge switch of the high-voltage pre-charge main circuit through the pre-charge control circuit, so that the pre-charge resistor R is connected to the relevant branch for pre-charging. At the same time, the pre-charge controller detects the pre-charge status through the high-voltage detection circuit. After the pre-charge controller determines that the pre-charge is complete, it controls the closing of the contactor on the corresponding branch and then disconnects the corresponding high-voltage pre-charge switch. Subsequently, the pre-charge controller controls other high-voltage pre-charge switches according to the command, connecting the same pre-charge resistor to other high-voltage branches that need to be pre-charged for pre-charging before applying high voltage power.

[0033] The pre-charge control unit only needs one pre-charge resistor to complete the pre-charging of multiple high-voltage main circuits, which greatly reduces the number of pre-charge resistors. At the same time, the pre-charge controller integrates a high-voltage pre-charge switch and a high-voltage status detection circuit, which greatly simplifies the layout of the high-voltage distribution unit, effectively reduces the volume of the distribution unit, and improves the efficiency of the use of pre-charge resistors.

[0034] In a specific implementation of an embodiment of the present invention, the high-voltage detection circuit determines whether the voltage values between the measuring points JC5 and JC2, JC3, and JC4 are consistent to determine whether the corresponding high-voltage pre-charge switch state is abnormal. At the same time, the high-voltage detection circuit determines whether the voltage values between the measuring points JC1 and JC2, JC3, and JC4 are consistent to determine whether the first contactor KM1, the second contactor KM2, and the third contactor KM3 are abnormal. The high-voltage detection circuit determines whether the voltage values between the measuring points JC5 and JC7 are consistent to determine whether the fourth contactor is abnormal. If there is no abnormality, wait for the next work instruction.

[0035] In a specific implementation of an embodiment of the present invention, when a power-on instruction of branch one is received, the pre-charge controller first enables the fourth pre-charge control switch K4, outputs a voltage through the output terminal DO4 to close the fourth contactor KM4, and then determines whether the fourth contactor KM4 is closed by comparing whether the voltage values of the measuring points JC5 and JC7 are consistent. After the fourth contactor KM4 is closed, the pre-charge controller controls the second pre-charge control switch K2 to be turned on, thereby controlling the first high-voltage pre-charge switch D1 connected to branch one to be turned on, and connecting the pre-charge resistor R in parallel to branch one to pre-charge branch one; at the same time, the pre-charge controller The pre-charge is completed by comparing the voltage values between the measuring points JC2 and JC6. When the ratio of the voltage value at the measuring point JC2 to the voltage value at the measuring point JC6 is greater than the set threshold value (for example, 95%), the pre-charge is completed. After the pre-charge is completed, the pre-charge controller controls the first contactor KM1 of the branch one by enabling the seventh pre-charge control switch K7 to close, and then controls the first high-voltage pre-charge switch D1 to open by opening the second pre-charge control switch K2, thereby disconnecting the pre-charge resistor R from the branch one. If the pre-charge voltage does not reach the pre-charge set voltage value when the pre-charge set time is reached, the pre-charge fails and the pre-charge is terminated. For details, see Figure 8 .

[0036] In a specific implementation of an embodiment of the present invention, when a power-on instruction of branch two is received, the pre-charge controller first enables the fourth pre-charge control switch K4, and closes the fourth contactor KM4 by outputting a voltage through the output terminal DO4. Subsequently, by comparing whether the voltage values of the measuring points JC5 and JC7 are consistent, it is determined whether the contactor KM4 is closed. After the fourth contactor KM4 is closed, the pre-charge controller enables the switching action of the first pre-charge control switch K1 to turn on its NO terminal, thereby controlling the second high-voltage pre-charge switch D2 connected to branch two to turn on, and connecting the pre-charge resistor R in parallel to branch two to pre-charge branch two; at the same time The pre-charge controller determines whether pre-charge is complete by comparing the voltage values between the measuring points JC3 and JC6. When the ratio of the voltage value at the measuring point JC3 to the voltage value at JC6 is greater than a set threshold (for example, 95%), pre-charge is complete. After pre-charge is complete, the pre-charge controller controls the second contactor KM2 of branch 2 by enabling the sixth pre-charge control switch K6 to close, and then controls the second high-voltage pre-charge switch D2 to open by opening the first pre-charge control switch K1, thereby disconnecting the pre-charge resistor R from branch 2. If the pre-charge voltage does not reach the pre-charge set voltage value when the pre-charge set time is reached, pre-charge fails and pre-charge is terminated. For details, see Figure 8 .

[0037] In a specific implementation of an embodiment of the present invention, when a power-on instruction of branch three is received, the pre-charge controller first enables the fourth pre-charge control switch K4, outputs a voltage through the output terminal DO4 to close the fourth contactor KM4, and then determines whether the fourth contactor KM4 is closed by comparing whether the voltage values of the measuring points JC5 and JC7 are consistent; after the fourth contactor KM4 is closed, the pre-charge controller first controls the third pre-charge control switch K3 of the pre-charge control circuit by enabling the switching action to turn on its NO terminal, and then controls the first pre-charge control switch K1 to turn on its NO terminal, thereby controlling the third high-voltage pre-charge switch D3 connected to branch three to turn on, and connects the pre-charge resistor R in parallel to branch three, so as to control branch three. At the same time, the pre-charge controller determines whether the pre-charge is completed by comparing the voltage values between the measuring points JC4 and JC6. When the ratio of the voltage value at the measuring point JC4 to the voltage value at JC6 is greater than the set threshold value (for example, 95%), the pre-charge is completed. After the pre-charge is completed, the pre-charge controller controls the third contactor KM3 in the branch three by enabling the fifth pre-charge control switch K5 to close, and then controls the third high-voltage pre-charge switch D3 to open by first closing the first pre-charge control switch K1 and then closing the third pre-charge control switch K3, thereby disconnecting the pre-charge resistor R from the branch three. If the pre-charge voltage does not reach the pre-charge set voltage value when the pre-charge set time is reached, the pre-charge fails and the pre-charge is terminated. For details, see Figure 8 . Example 2

[0038] An embodiment of the present invention provides a pre-fill control method applicable to the pre-fill control unit described in Embodiment 1, including: Use the high voltage detection circuit to determine whether the first contactor KM1, the second contactor KM2, the third contactor KM3 and the fourth contactor KM4 are abnormal; When it is determined that the first contactor KM1, the second contactor KM2, the third contactor KM3 and the fourth contactor KM4 are all in normal state, according to the power-on instruction of branch one, the power-on instruction of branch two or the power-on instruction of branch three, the high-voltage pre-charging main circuit, the high-voltage detection circuit, the pre-charging control circuit, the pre-charging resistor R, the first contactor KM1, the second contactor KM2, and the third contactor KM3 are coordinated to pre-charge branch one, branch two or branch three. Example 3

[0039] A crane is provided in an embodiment of the present invention, comprising the pre-charging control unit described in Example 1.

[0040] Those skilled in the art will appreciate that the embodiments of the present application may be provided as methods, systems, or computer program products. Therefore, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware. Furthermore, the present application may take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to magnetic disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0041] The present application is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), and computer program products according to the embodiments of the present application. It should be understood that each process and / or block in the flowchart and / or block diagram, as well as the combination of processes and / or blocks in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 a process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0042] These computer program instructions may also be stored in a computer readable memory that can direct a computer or other programmable data processing device to work in a specific manner, so that the instructions stored in the computer readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 a process or multiple processes and / or boxes Figure 1 The function specified in one or more boxes.

[0043] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operational steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing the instructions executed on the computer or other programmable device for implementing the process. Figure 1 a process or multiple processes and / or boxes Figure 1 The steps for the function specified in one or more boxes.

[0044] The embodiments of the present invention are described above in conjunction with the accompanying drawings, but the present invention is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the guidance of the present invention, ordinary technicians in this field can also make many forms without departing from the scope of protection of the purpose of the present invention and the claims, which are all protected by the present invention.

[0045] The basic principles, main features, and advantages of the present invention are shown and described above. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are merely illustrative of the principles of the present invention. Various changes and modifications may be made to the present invention without departing from the spirit and scope of the present invention. Such changes and modifications are intended to fall within the scope of the present invention. The scope of protection claimed in the present invention is defined by the appended claims and their equivalents.

Claims

1. A pre-charge control unit, characterized in that: include: Branch 1, branch 2, branch 3, fourth contactor, pre-charge controller and pre-charge resistor; The branch 1, branch 2 and branch 3 are arranged in parallel and connected in series with the fourth contactor and the external power supply; A first contactor, a second contactor and a third contactor are respectively provided between the two ends of the branch 1, the branch 2 and the branch 3; The pre-charge controller includes a pre-charge control circuit, a high-voltage detection circuit and a high-voltage pre-charge main circuit; the output end of the pre-charge control circuit is respectively connected to the control end of the high-voltage pre-charge main circuit, the first contactor, the second contactor, the third contactor and the fourth contactor; the input end of the high-voltage pre-charge main circuit is connected to the first end of the pre-charge resistor and the input end of the high-voltage detection circuit, and its output end is respectively connected to the second end of branch one, branch two and branch three; the second end of the pre-charge resistor is respectively connected to the first end of branch one, branch two and branch three, and the input end of the high-voltage detection circuit; the input end of the high-voltage detection circuit is also respectively connected to the two ends of the fourth contactor and the output end of the high-voltage pre-charge main circuit.

2. A pre-charge control unit according to claim 1, characterized in that: The high-voltage pre-charge main circuit includes a first high-voltage pre-charge switch D1, a second high-voltage pre-charge switch D2 and a third high-voltage pre-charge switch D3 arranged in parallel; The positive electrodes of the first high-voltage pre-charge switch D1, the second high-voltage pre-charge switch D2 and the third high-voltage pre-charge switch D3 are connected to the first end of the pre-charge resistor; The cathodes of the first high-voltage pre-charge switch D1, the second high-voltage pre-charge switch D2, and the third high-voltage pre-charge switch D3 are connected to the second ends of branch 1, branch 2, and branch 3, respectively; The positive and negative electrodes of the first high-voltage pre-charge switch D1 , the second high-voltage pre-charge switch D2 and the third high-voltage pre-charge switch D3 are each provided with a state measurement point, and each state measurement point is connected to the input end of the high-voltage detection circuit.

3. A pre-charge control unit according to claim 2, characterized in that: The pre-charge control circuit includes a first pre-charge control switch K1, a second pre-charge control switch K2, a third pre-charge control switch K3, a fourth pre-charge control switch K4, a fifth pre-charge control switch K5, a sixth pre-charge control switch K6 and a seventh pre-charge control switch K7; The first pre-charge control switch K1 and the third pre-charge control switch K3 each have three ports, defined as com, NC, and NO, respectively, where com is a common input terminal, NC is a normally closed output terminal, and NO is a normally open output terminal; The second pre-charge control switch K2 includes two ports, which are defined as a com terminal and a NO terminal, wherein the com terminal is an input terminal and the NO terminal is an output terminal; The NC terminal of the first pre-fill control switch K1 is connected to the com terminal of the second pre-fill control switch K2, and the NO terminal of the first pre-fill control switch K1 is connected to the com terminal of the third pre-fill control switch K3; The com terminal of the first pre-charge control switch K1 is the total input terminal VCC of the pre-charge control circuit, which is used to connect to the power supply; the NO terminal of the second pre-charge control switch K2 is the output terminal DO1 of the pre-charge control circuit, the NC terminal of the third pre-charge control switch K3 is the output terminal DO2 of the pre-charge control circuit, and the NO terminal of the third pre-charge control switch K3 is the output terminal DO3 of the pre-charge control circuit; the output terminals DO1, DO2 and DO3 are respectively connected to the control terminals of the first high-voltage pre-charge switch D1, the second high-voltage pre-charge switch D2 and the third high-voltage pre-charge switch D3; The fourth pre-charge control switch K4, the fifth pre-charge control switch K5, the sixth pre-charge control switch K6 and the seventh pre-charge control switch K7 each include two ports, respectively defined as a com terminal and an NO terminal, wherein the com terminal is an input terminal for connecting to a power supply; the NO terminal is an output terminal for connecting to the control terminals of the fourth contactor, the third contactor, the second contactor, and the first contactor, respectively; The NO terminal of the fourth pre-charge control switch K4 is D04; The NO terminal of the fifth pre-charge control switch K5 is D05; The NO terminal of the sixth pre-charge control switch K6 is D06; The NO terminal of the seventh pre-charge control switch K7 is D07.

4. A pre-charge control unit according to claim 3, characterized in that: The high-voltage detection circuit includes a first detection sub-circuit HVAI1, a second detection sub-circuit HVAI2, a third detection sub-circuit HVAI3, a fourth detection sub-circuit HVAI4, a fifth detection sub-circuit HVAI5, a sixth detection sub-circuit HVAI6 and a seventh detection sub-circuit HVAI7 arranged in parallel; The first detection sub-circuit HVAI1 is connected to a measurement point JC1 at the positive electrode of the first high-voltage pre-charge switch D1; The second detection sub-circuit HVAI2 is connected to the measurement point JC2 at the negative electrode of the first high-voltage pre-charge switch D1; The third detection sub-circuit HVAI3 is connected to the measurement point JC3 at the negative electrode of the second high-voltage pre-charge switch D2; The fourth detection sub-circuit HVAI4 is connected to the measurement point JC4 at the negative electrode of the third high-voltage pre-charge switch D3; The fifth detection sub-circuit HVAI5 and the seventh detection sub-circuit HVAI7 are respectively connected to the measurement points JC5 and JC7 at both ends of the fourth contactor; The sixth detection sub-circuit HVAI6 is connected to a measurement point JC6 at the second end of the pre-charging resistor.

5. A pre-charge control unit according to claim 4, characterized in that: The high-voltage detection circuit determines whether the voltage values between the measuring points JC5 and JC2, JC3, and JC4 are consistent to determine whether the corresponding high-voltage pre-charge switch status is abnormal. At the same time, the high-voltage detection circuit determines whether the voltage values between the measuring points JC1 and JC2, JC3, and JC4 are consistent to determine whether the first contactor, the second contactor, and the third contactor are abnormal. The high-voltage detection circuit determines whether the voltage values between the measuring points JC5 and JC7 are consistent to determine whether the fourth contactor is abnormal.

6. A pre-charge control unit according to claim 4, characterized in that: When receiving the power-on instruction of branch one, the pre-charge controller first enables the fourth pre-charge control switch K4, outputs a voltage through the output terminal DO4 to close the fourth contactor KM4, and then determines whether the fourth contactor KM4 is closed by comparing whether the voltage values of the measuring points JC5 and JC7 are consistent. After the fourth contactor KM4 is closed, the pre-charge controller enables the second pre-charge control switch K2 to be turned on, thereby controlling the first high-voltage pre-charge switch D1 connected to branch one to be turned on, and connecting the pre-charge resistor R in parallel to branch one to pre-charge branch one; at the same time, the pre-charge controller determines whether the pre-charge is completed by comparing the voltage values between the measuring points JC2 and JC6. When the ratio of the voltage value at the measuring point JC2 to the voltage value at the measuring point JC6 is greater than the set threshold, the pre-charge is completed; After the pre-charging is completed, the pre-charging controller controls the first contactor KM1 of branch one by enabling the seventh pre-charging control switch K7 to close, and then controls the first high-voltage pre-charging switch D1 to open by opening the second pre-charging control switch K2, thereby disconnecting the pre-charging resistor R from branch one. If the pre-charge voltage does not reach the pre-charge set voltage value when the pre-charge set time is reached, the pre-charge fails and the pre-charge is terminated.

7. A pre-charge control unit according to claim 4, characterized in that: When receiving the power-on instruction of branch two, the pre-charge controller first enables the fourth pre-charge control switch K4, outputs the voltage through the output terminal DO4 to close the fourth contactor KM4, and then determines whether the contactor KM4 is closed by comparing whether the voltage values of the measuring points JC5 and JC7 are consistent. After the fourth contactor KM4 is closed, the pre-charge controller enables the switching action of the first pre-charge control switch K1 to turn on its NO terminal, thereby controlling the second high-voltage pre-charge switch D2 connected to branch two to turn on, and connects the pre-charge resistor R in parallel to branch two to pre-charge branch two; at the same time, the pre-charge controller determines whether the pre-charge is completed by comparing the voltage values between the measuring points JC3 and JC6. When the ratio of the voltage value at the measuring point JC3 to the voltage value at JC6 is greater than the set threshold, the pre-charge is completed; After the pre-charging is completed, the pre-charging controller controls the second contactor KM2 of the second branch by enabling and controlling the sixth pre-charging control switch K6 to close, and then controls the second high-voltage pre-charging switch D2 to open by opening the first pre-charging control switch K1, thereby disconnecting the pre-charging resistor R from the second branch; If the pre-charge voltage does not reach the pre-charge set voltage value when the pre-charge set time is reached, the pre-charge fails and the pre-charge is terminated.

8. A pre-charge control unit according to claim 4, characterized in that: When receiving the power-on instruction of branch three, the pre-charge controller first enables the fourth pre-charge control switch K4, outputs the voltage through the output terminal DO4 to close the fourth contactor KM4, and then determines whether the fourth contactor KM4 is closed by comparing whether the voltage values of the measuring points JC5 and JC7 are consistent; after the fourth contactor KM4 is closed, the pre-charge controller first enables the switching action of the third pre-charge control switch K3 of the pre-charge control circuit to turn on its NO terminal, and then controls the first pre-charge control switch K1 to turn on its NO terminal, thereby controlling the third high-voltage pre-charge switch D3 connected to branch three to turn on, and connect the pre-charge resistor R in parallel to branch three to pre-charge branch three; at the same time, the pre-charge controller determines whether the pre-charge is completed by comparing the voltage values between the measuring points JC4 and JC6. When the ratio of the voltage value at the measuring point JC4 to the voltage value at JC6 is greater than the set threshold, the pre-charge is completed; After the pre-charging is completed, the pre-charging controller controls the third contactor KM3 in branch three by enabling the fifth pre-charging control switch K5 to close, and then controls the third high-voltage pre-charging switch D3 to disconnect by first closing the first pre-charging control switch K1 and then closing the third pre-charging control switch K3, thereby disconnecting the pre-charging resistor R from branch three; if the pre-charging voltage does not reach the pre-charging set voltage value when the pre-charging set time is reached, the pre-charging fails and the pre-charging is terminated.

9. A pre-fill control method applicable to the pre-fill control unit according to any one of claims 1 to 8, characterized in that: include: Using a high voltage detection circuit to determine whether the first contactor, the second contactor, the third contactor, and the fourth contactor are abnormal; When it is determined that the first contactor, the second contactor, the third contactor and the fourth contactor are all in normal state, according to the power-on instruction of branch one, the power-on instruction of branch two or the power-on instruction of branch three, the high-voltage pre-charging main circuit, the high-voltage detection circuit, the pre-charging control circuit, the pre-charging resistor, the first contactor, the second contactor and the third contactor are coordinated to pre-charge branch one, branch two or branch three.

10. A crane, characterized in that: The invention comprises a pre-charge control unit according to any one of claims 1 to 8.

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