Multi-branch Hall current acquisition circuit for special vehicle

Abstract

The utility model discloses a multi-branch Hall current acquisition circuit for a special vehicle, which comprises a first branch, a second branch, a third branch and a current identification module, and is characterized in that the first branch, the second branch and the third branch are connected between a load anode and a load cathode; the first branch comprises a first MSD switch, a second MSD switch, a fifth Hall current sensor and a sixth Hall current sensor, the second branch comprises a third MSD switch, a fourth MSD switch, a third Hall current sensor and a fourth Hall current sensor, and the third branch comprises a fifth MSD switch, a sixth MSD switch, a first Hall current sensor and a second Hall current sensor. The current identification module is connected with the first Hall current sensor, the second Hall current sensor, the third Hall current sensor, the fourth Hall current sensor, the fifth Hall current sensor and the sixth Hall current sensor. According to the utility model, wide-range current can be covered, and the detection precision can be ensured.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of special vehicle battery management, specifically relates to a special vehicle multi-branch hall current acquisition circuit. BACKGROUND

[0002] At present, the BMS management system on the special vehicle adopts the current transformer mode to detect the current, collects the power consumption current of the special vehicle through the current transformer and obtains the current value after processing and operation, but the detection range of the current transformer cannot cover wide range current, and cannot guarantee the precision, leading to problems such as small current cannot be collected or collected inaccurately, and is not applicable in some occasions with high precision requirements for the current value. UTILITY MODEL CONTENT

[0003] The utility model aims at overcoming the insufficient of prior art, and provides a special vehicle multi-branch hall current acquisition circuit, which can cover wide range current and guarantee detection precision.

[0004] The technical scheme of the utility model is as follows:

[0005] A special vehicle multi-branch hall current acquisition circuit, comprising a first branch, a second branch, a third branch and a current identification module, the first branch, the second branch and the third branch are connected between the load positive pole and the load negative pole, the first branch comprises a first MSD switch, a second MSD switch, a fifth hall current sensor and a sixth hall current sensor, the positive pole of the second MSD switch is connected with the load positive pole through the first MSD switch, the negative pole of the second MSD switch is connected with the load negative pole through the fifth hall current sensor and the sixth hall current sensor in sequence, the second branch comprises a third MSD switch, a fourth MSD switch, a third hall current sensor and a fourth hall current sensor, the positive pole of the fourth MSD switch is connected with the load positive pole through the third MSD switch, the negative pole of the fourth MSD switch is connected with the load negative pole through the third hall current sensor and the fourth hall current sensor in sequence, the third branch comprises a fifth MSD switch, a sixth MSD switch, a first hall current sensor and a second hall current sensor, the positive pole of the sixth MSD switch is connected with the load positive pole through the fifth MSD switch, the negative pole of the sixth MSD switch is connected with the load negative pole through the first hall current sensor and the second hall current sensor in sequence, and the current identification module is connected with the first hall current sensor, the second hall current sensor, the third hall current sensor, the fourth hall current sensor, the fifth hall current sensor and the sixth hall current sensor.

[0006] Among them, the first MSD switch, the third MSD switch and the fifth MSD switch adopt 750V switch.

[0007] The second MSD switch, the fourth MSD switch and the sixth MSD switch adopt 1500V switches.

[0008] The first Hall current sensor, the third Hall current sensor and the fifth Hall current sensor collect the current in the range of 0-50A.

[0009] The second Hall current sensor, the fourth Hall current sensor and the sixth Hall current sensor collect the current in the range of 0-1000A.

[0010] Compared with the prior art, the utility model has the beneficial effects that: through the multi-branch multi-Hall current collection, the utility model can acquire the higher current precision of different areas, and can make data analysis on the charge and discharge of the multi-branch battery according to the current size, and diagnose the aging degree of the branch battery. When the battery of the special vehicle is applied in the multi-cluster parallel mode, the sensors of different sampling intervals are placed in the branch to be used as the collection basis, and then the Hall current data is selected according to the current size, so that the accuracy of current acquisition is improved. When applied to the multi-branch battery parallel application scene of the special vehicle, the problem that the small current cannot be collected can be solved, so that the calculation precision of the BMS on some SOC and the like and the health state of the branch battery are improved. BRIEF DESCRIPTION OF DRAWINGS

[0011] In order to more clearly illustrate the technical scheme in the embodiments of the utility model, the drawings needed to be used in the embodiments or the prior art description will be briefly introduced below, and obviously, the drawings in the following description are only some embodiments of the utility model, and those skilled in the art can also obtain other drawings according to these drawings without creating labor.

[0012] Figure 1 It is the circuit schematic diagram of the utility model;

[0013] Figure 2 It is the detection principle diagram of the utility model. DETAILED DESCRIPTION

[0014] In order to make the purpose, technical scheme and advantages of the utility model more clear and obvious, the utility model will be further described in detail below by combining with the drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model, and are not used to limit the utility model.

[0015] In order to illustrate the technical scheme described in the utility model, the following will be described through specific embodiments.

[0016] EMBODIMENT

[0017] Please refer to Figure 1The embodiment provides a special vehicle multi-branch Hall current acquisition circuit, which comprises a first branch 1, a second branch 2, a third branch 3 and a current identification module 4, and the first branch 1, the second branch 2 and the third branch 3 are connected between a load positive electrode and a load negative electrode.

[0018] The first branch 1 comprises a first MSD switch 11, a second MSD switch 12, a fifth Hall current sensor 13 and a sixth Hall current sensor 14, the positive electrode of the second MSD switch 12 is connected to the load positive electrode through the first MSD switch 11, and the negative electrode of the second MSD switch 12 is connected to the load negative electrode through the fifth Hall current sensor 13 and the sixth Hall current sensor 14 in sequence.

[0019] The second branch 2 comprises a third MSD switch 21, a fourth MSD switch 22, a third Hall current sensor 23 and a fourth Hall current sensor 24, the positive electrode of the fourth MSD switch 22 is connected to the load positive electrode through the third MSD switch 21, and the negative electrode of the fourth MSD switch 22 is connected to the load negative electrode through the third Hall current sensor 23 and the fourth Hall current sensor 24 in sequence.

[0020] The third branch 3 comprises a fifth MSD switch 31, a sixth MSD switch 32, a first Hall current sensor 33 and a second Hall current sensor 34, the positive electrode of the sixth MSD switch 32 is connected to the load positive electrode through the fifth MSD switch 31, and the negative electrode of the sixth MSD switch 32 is connected to the load negative electrode through the first Hall current sensor 33 and the second Hall current sensor 34 in sequence.

[0021] The current identification module 4 is connected with the first Hall current sensor 33, the second Hall current sensor 34, the third Hall current sensor 23, the fourth Hall current sensor 24, the fifth Hall current sensor 13 and the sixth Hall current sensor 14 respectively.

[0022] The first MSD switch 11, the third MSD switch 21 and the fifth MSD switch 31 are 750V switches.

[0023] The second MSD switch 12, the fourth MSD switch 22 and the sixth MSD switch 32 are 1500V switches.

[0024] The first Hall current sensor 33, the third Hall current sensor 23 and the fifth Hall current sensor 13 have a current acquisition range of 0-50A.

[0025] The second Hall current sensor 34, the fourth Hall current sensor 24 and the sixth Hall current sensor 14 have a current acquisition range of 0-1000A.

[0026] The application of improving current sampling precision: the walking motor of the special vehicle is generally small in power, and the current during walking is not more than 100A, but the working current during actual operation is large, such as 800A, the current detection principle is shown as 2, branch battery difference data analysis, when the branch current is detected to be not equal, the attenuation degree of the battery of a branch is effectively analyzed to be too large, the internal resistance is large, the current is small, thereby the difference of the battery of the branch can be reflected, the user is reminded to maintain, and the overload safety accident caused by large parallel circulating current is avoided.

[0027] The above is only a preferred embodiment of the present application, and is not used to limit the present application, and any modification, equivalent replacement and improvement made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A multi-branch Hall current acquisition circuit for special vehicles, characterized in that: The current recognition module is connected with the first Hall current sensor, the second Hall current sensor, the third Hall current sensor, the fourth Hall current sensor, the fifth Hall current sensor and the sixth Hall current sensor.

2. The multi-branch Hall current acquisition circuit of a special vehicle according to claim 1, characterized in that: The first MSD switch, the third MSD switch and the fifth MSD switch adopt 750V switches.

3. The multi-branch Hall current acquisition circuit of a special vehicle according to claim 1, characterized in that: The second MSD switch, the fourth MSD switch and the sixth MSD switch adopt 1500V switches.

4. The multi-branch Hall current acquisition circuit of a special vehicle according to claim 1, characterized in that: The first Hall current sensor, the third Hall current sensor and the fifth Hall current sensor collect current in the range of 0-50A.

5. The multi-branch Hall current acquisition circuit of a special vehicle according to claim 1, characterized in that: The second Hall current sensor, the fourth Hall current sensor and the sixth Hall current sensor collect current in the range of 0-1000A.

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