Mode switching circuit, battery management system and vehicle

Abstract

The utility model provides a mode switching circuit, a battery management system and a vehicle. The mode switching circuit comprises a basic circuit, a first branch circuit and a power supply chip, a debugging resistor and a first resistor which are connected in series are arranged on the basic circuit; the first branch is connected in parallel to the two ends of the debugging resistor, an equivalent resistor and a circuit on-off control unit are arranged on the first branch, and the circuit on-off control unit is used for connecting or disconnecting the first branch; the power supply chip is connected between the first resistor and the equivalent resistor and is used for collecting the potential of the first resistor or the equivalent resistor, and the power supply chip enters a debugging mode when the first branch circuit is conducted and keeps a normal working mode when the first branch circuit is cut off. According to the mode switching circuit provided by the utility model, the first branch is switched on or off by utilizing the circuit on-off control unit, so that the switching of the power supply chip between a debugging mode and a normal working mode is realized, the repeated hardware welding can be avoided, and the welding quality risk is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of circuit design, and in particular to a mode switching circuit. The utility model also relates to a battery management system provided with the mode switching circuit, and a vehicle provided with the battery management system. Background Art

[0002] During the software development process, BMS needs to switch back and forth between debugging state and normal working state, so the debugging resistor needs to be repeatedly welded and removed. Frequent welding and desoldering can cause the pad to fall off, and it is necessary to repeatedly coordinate with hardware welding operators to support welding. In addition, when BMS has software problems, it is necessary to connect the software debugging tool. At this time, BMS must weld the debugging resistor to enter the debugging state. However, BMS is sprayed with three-conformal paint when it leaves the factory, and the three-conformal paint needs to be heated and peeled off to weld the debugging resistor. This process may cause known problems to no longer recur, which brings risks to problem troubleshooting. Utility Model Content

[0003] In view of this, the utility model aims to provide a mode switching circuit so that when the power chip is in the debugging mode, it is not necessary to repeatedly perform hardware welding to avoid welding quality risks.

[0004] In order to achieve the above object, the technical solution of the utility model is implemented as follows:

[0005] A mode switching circuit comprises a basic circuit, a first branch and a power chip;

[0006] The basic circuit is provided with a debugging resistor and a first resistor connected in series;

[0007] The first branch is connected in parallel to both ends of the debugging resistor, and an equivalent resistor and a circuit on-off control unit are provided on the first branch, and the circuit on-off control unit is used to turn on or off the first branch;

[0008] The power chip is connected between the first resistor and the equivalent resistor and is used to collect the potential of the first resistor or the equivalent resistor. The power chip enters a debugging mode when the first branch is turned on, and maintains a normal working mode when the first branch is turned off.

[0009] Furthermore, it also includes a level signal connection branch, one end of which is connected to the circuit on-off control unit, and the other end is used to connect to a micro control unit. The micro control unit inputs a level signal to the circuit on-off unit through the level signal connection branch to turn on or off the first branch.

[0010] Furthermore, a fourth branch is connected between the level signal connection branch and the basic circuit;

[0011] The connection point between the fourth branch and the basic circuit is located downstream of the first resistor, and an electrical element for lowering the level of the circuit on-off control unit is provided on the fourth branch.

[0012] Furthermore, the electrical element includes a second resistor, and the resistance of the second resistor is greater than the resistance of the equivalent resistor.

[0013] Furthermore, the basic circuit includes a second branch, a first end of the second branch is connected to a power supply end, and a second end of the second branch is connected to a ground end; the debugging resistor and the first resistor are connected in series on the second branch, and the first resistor is arranged close to the ground end.

[0014] Furthermore, a first connection point Q between the first branch and the second branch is arranged close to the power supply end, a second connection point M between the first branch and the second branch is located between the debugging resistor and the first resistor, and the power chip is connected to the second connection point M through a branch.

[0015] Further, the equivalent resistor is one connected in series on the first branch, and the resistance of the equivalent resistor is equal to the resistance of the debugging resistor, or the equivalent resistor is a plurality of connected in series on the first branch, and the sum of the resistances of the plurality of equivalent resistors is equal to the resistance of the debugging resistor.

[0016] Furthermore, the circuit on-off control unit adopts a triode or a MOS tube.

[0017] Compared with the prior art, the utility model has the following advantages:

[0018] The mode switching circuit described in the utility model is configured with a first branch connected in parallel at both ends of a debugging resistor, and an equivalent resistor and a circuit power-on control unit configured on the first branch, and the circuit on-off control unit is used to turn on or off the first branch, so that the power supply chip enters a debugging mode when the first branch is turned on, and a normal working mode is guaranteed when the first branch is turned off, thereby avoiding repeated hardware welding and avoiding welding quality risks caused by welding with the debugging resistor introduced, and the circuit structure is simple, the cost is low, the operation is simple, and the use effect is very good.

[0019] In addition, the setting of the level signal connection branch facilitates the connection between the micro control unit and the circuit on-off control unit, and controls the on-off or off-off of the circuit on-off unit by means of the level signal of the micro control unit, thereby turning on or off the first branch, and the structure is simple and the connection is reliable. The fourth branch set between the level signal connection branch and the second branch, and the electrical element set on the fourth branch, can reduce the level of the base of the triode when the micro control unit does not output the level signal, thereby ensuring the stability of the off state of the first branch, so that the power chip can stably maintain the normal working mode.

[0020] In addition, the electrical component adopts a second resistor, and the resistance value of the second resistor is limited. It has a simple structure, low cost, and can play a good role in lowering the level of the circuit on-off control unit. The power chip is connected to the second connection point through a branch connection, which is conducive to collecting the potential of the first resistor or the equivalent resistor. The equivalent resistor is set as a resistor with the same resistance value as the debugging resistor, with a simple structure and a small number of parts; the equivalent resistor is set as a plurality of resistors, the sum of the resistance values ​​of the plurality of resistors is the same as the resistance value of the debugging resistor, and the equivalent resistor can also achieve the same function as the debugging resistor.

[0021] Another object of the present invention is to provide a battery management system, which includes a micro control unit and the mode switching circuit as described above.

[0022] Another object of the present invention is to provide a vehicle, in which the battery management system as described above is provided.

[0023] The battery management system and the vehicle of the present invention have the same beneficial effects as the mode switching circuit described above relative to the prior art, and will not be described in detail herein. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention. In the accompanying drawings:

[0025] Figure 1 It is a schematic diagram of the mode switching circuit described in the embodiment of the utility model;

[0026] Description of reference numerals:

[0027] 1. Power supply terminal; 2. Ground terminal; 3. Debug resistor; 4. First resistor; 5. Power chip; 6. Transistor; 7. Equivalent resistor; 8. Second resistor;

[0028] 10, first branch; 20, second branch; 30, level signal connection branch; 40, fourth branch; 50, branch branch. DETAILED DESCRIPTION

[0029] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other.

[0030] In the description of the present invention, it should be noted that if there are terms such as "upper", "lower", "inner", "outer" and the like indicating orientation or positional relationship, they are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, if there are terms such as "first" and "second", they are also used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0031] In addition, in the description of the present invention, unless otherwise clearly defined, the terms "installation", "connection", "connection" and "connector" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood in combination with specific circumstances.

[0032] The present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments.

[0033] Embodiment 1

[0034] This embodiment relates to a mode switching circuit, which can avoid the risk of welding quality without repeated hardware welding when the power chip 5 is in the debugging mode.

[0035] In terms of overall composition, Figure 1 As shown, the mode switching circuit of this embodiment includes a basic circuit, a first branch 10 and a power chip 5 .

[0036] Among them, the basic circuit is provided with a debugging resistor 3 and a first resistor 4 connected in series. The first branch 10 is connected in parallel to both ends of the debugging resistor 3, and the first branch 10 is provided with an equivalent resistor 7 and a circuit on-off control unit, and the circuit on-off control unit is used to turn on or off the first branch. The power chip 5 is connected between the first resistor 4 and the equivalent resistor 7, and is used to collect the potential of the first resistor 4 or the equivalent resistor 7, and the power chip 5 enters the debugging mode when the first branch 10 is turned on, and the power chip 5 maintains the normal working mode when the first branch 10 is turned off.

[0037] At this time, as the overall design above, by setting a first branch 10 connected in parallel at both ends of the debugging resistor 3, and an equivalent resistor 7 and a circuit power-on control unit set on the first branch 10, and using the circuit on-off control unit to turn on or off the first branch 10, the power chip 5 enters the debugging mode when the first branch 10 is turned on, and ensures the normal working mode when the first branch 10 is turned off. In this way, the power chip 5 can be switched between the debugging mode and the normal working mode, and there is no need to repeatedly weld the debugging resistor 3 as in the prior art, and the risk of welding quality can be avoided.

[0038] Based on the above overall structure, for details, see Figure 1 As shown, as a preferred implementation, the basic circuit of this embodiment includes a second branch 20, the first end of the second branch 20 is connected to the power supply terminal 1, the second end of the second branch 20 is connected to the ground terminal 2, the debugging resistor 3 and the first resistor 4 are connected in series on the second branch 20, and the first resistor 4 is arranged close to the ground terminal 2.

[0039] Moreover, the first branch 10 is connected in parallel to both ends of the debugging resistor 3. In specific implementation, the first connection point Q of the first branch 10 and the second branch 20 is arranged close to the power supply terminal 1, and the second connection point M of the first branch 10 and the second branch 20 is located between the debugging resistor 3 and the first resistor 4. The power chip 5 is specifically connected to the second connection point M through the branch 50. The setting of the branch 50 facilitates the connection between the power chip 5 and the second connection point M, and is also conducive to collecting the potential of the first resistor 4 or the equivalent resistor 7.

[0040] As a preferred implementation, the mode switching circuit of this embodiment further includes a level signal connection branch 30, one end of the level signal connection branch 30 is connected to the circuit on-off control unit, and the other end is used to connect the micro control unit, and the micro control unit inputs a level signal to the circuit on-off unit through the level signal connection branch 30 to turn on or off the first branch 10. At this time, the setting of the level signal connection branch can facilitate the connection between the micro control unit and the circuit on-off control unit, and control the on or off of the circuit on-off unit with the help of the level signal of the micro control unit, so as to turn on or off the first branch, and its structure is simple and the connection is reliable.

[0041] The circuit on-off control unit of this embodiment, as a preferred implementation form, adopts a transistor 6 or a MOS tube, and preferably adopts a transistor 6, which has a low cost and can ensure reliability in use.

[0042] In a specific implementation, the collector and emitter of the transistor 6 are respectively connected in series to the first branch 10, and the base of the transistor 6 is used to be connected to the micro control unit. The micro control unit inputs a level signal to the transistor 6 to turn on or off the transistor 6, that is, turn on or off the first branch 10. The power chip 5 enters the debugging mode when the first branch 10 is turned on, and the power chip 5 maintains the normal working mode when the first branch 10 is turned off.

[0043] It should be noted that the microcontroller mentioned above can adopt a mature single-chip microcomputer in the prior art, and input a level signal to the transistor 6 through the unit machine to turn the transistor 6 on or off. When a high-level signal is input, the transistor 6 is turned on, the first branch 10 is turned on, and the power chip 5 enters the debugging mode. When a low-level signal is input, the transistor 6 is turned off, the first branch 10 is disconnected, and the power chip 5 remains in the normal working mode.

[0044] As a further preferred implementation, in this embodiment, a fourth branch 40 is connected between the level signal connection branch 30 and the basic circuit, and the connection point between the fourth branch 40 and the basic circuit is located downstream of the first resistor 4, that is, the connection point between the fourth branch 40 and the second branch is located between the first resistor 4 and the ground terminal, and an electrical component for pulling down the level of the circuit on-off control unit is provided on the fourth branch 40. In this way, when the micro control unit does not output a level signal, the level of the base of the transistor 6 can be reduced to ensure the stability of the cut-off state of the first branch 10, so that the power chip 5 can stably maintain the normal working mode.

[0045] Specifically, the electrical component includes a second resistor 8, and the resistance of the second resistor 8 is greater than the resistance of the equivalent resistor 7. At this time, the electrical component uses the second resistor 8 and limits the resistance of the second resistor 8, which can not only play a good role in lowering the level of the circuit control unit, that is, the transistor 6, but also has a simple structure and low cost.

[0046] It is worth noting that, in addition to the second resistor 8, the electrical components on the fourth branch 40 may also be other electrical components used in the prior art to lower the level of the circuit on / off control unit.

[0047] In addition, the equivalent resistor 7 of the present embodiment, as a feasible implementation mode, is one equivalent resistor 7 connected in series on the first branch 10, and the resistance value of the equivalent resistor 7 is equal to the resistance value of the debugging resistor 3. As another feasible implementation mode, the equivalent resistor 7 can also be a plurality of equivalent resistors connected in series on the first branch 10, and the sum of the resistance values ​​of the plurality of equivalent resistors 7 is equal to the resistance value of the debugging resistor 3. When the equivalent resistor is set to a resistor with the same resistance value as the debugging resistor, its structure is simple and the number of parts used is small. When the equivalent resistor is set to a plurality of resistors, and the sum of the resistance values ​​of the plurality of resistors is the same as the resistance value of the debugging resistor, it can also achieve the same effect of the equivalent resistor and the debugging resistor.

[0048] The mode switching circuit of this embodiment, when used, uses a microcontroller unit to input a level signal to the base of the transistor 6, so that the transistor 6 is turned on or off, thereby turning on or off the first branch 10, so that the power chip 5 enters the debugging mode when the first branch 10 is turned on, and ensures the normal working mode when the first branch 10 is turned off. In this way, it is unnecessary to repeatedly perform hardware welding, and the welding quality risk caused by the welding of the debugging resistor 3 can be avoided. It has the characteristics of simple circuit structure, low cost and simple operation, and has a good use effect.

[0049] Embodiment 2

[0050] This embodiment relates to a battery management system, which includes a micro control unit and the mode switching circuit of Embodiment 1. In specific implementation, the circuit on-off control unit is connected to the micro control unit, that is, the base of the transistor 6 is connected to the micro control unit.

[0051] At the same time, this embodiment also relates to a vehicle, in which the above-mentioned battery management system is provided.

[0052] The battery management system and the vehicle of this embodiment have the same technical effects as the mode switching circuit described in the first embodiment compared with the prior art, and are not described in detail here.

[0053] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A mode switching circuit, characterized in that: It includes a basic circuit, a first branch and a power chip; The basic circuit is provided with a debugging resistor and a first resistor connected in series; The first branch is connected in parallel to both ends of the debugging resistor, and an equivalent resistor and a circuit on-off control unit are provided on the first branch, and the circuit on-off control unit is used to turn on or off the first branch; The power chip is connected between the first resistor and the equivalent resistor and is used to collect the potential of the first resistor or the equivalent resistor. The power chip enters a debugging mode when the first branch is turned on, and maintains a normal working mode when the first branch is turned off.

2. The mode switching circuit according to claim 1, characterized in that: It also includes a level signal connection branch, one end of which is connected to the circuit on-off control unit, and the other end is used to connect to a micro control unit. The micro control unit inputs a level signal to the circuit on-off unit through the level signal connection branch to turn on or off the first branch.

3. The mode switching circuit according to claim 2, characterized in that: A fourth branch is connected between the level signal connection branch and the basic circuit; The connection point between the fourth branch and the basic circuit is located downstream of the first resistor, and an electrical element for lowering the level of the circuit on-off control unit is provided on the fourth branch.

4. The mode switching circuit according to claim 3, characterized in that: The electrical element includes a second resistor, and a resistance value of the second resistor is greater than a resistance value of the equivalent resistor.

5. The mode switching circuit according to claim 1, characterized in that: The basic circuit comprises a second branch, a first end of the second branch is connected to a power supply end, and a second end of the second branch is connected to a ground end; The debugging resistor and the first resistor are connected in series on the second branch, and the first resistor is arranged close to the ground terminal.

6. The mode switching circuit according to claim 5, characterized in that: The first connection point Q between the first branch and the second branch is arranged close to the power supply end, the second connection point M between the first branch and the second branch is located between the debugging resistor and the first resistor, and the power chip is connected to the second connection point M through a branch.

7. The mode switching circuit according to claim 1, characterized in that: The equivalent resistor is one connected in series on the first branch, and the resistance of the equivalent resistor is equal to the resistance of the debugging resistor, or the equivalent resistor is a plurality of connected in series on the first branch, and the sum of the resistances of the plurality of equivalent resistors is equal to the resistance of the debugging resistor.

8. The mode switching circuit according to any one of claims 1 to 7, characterized in that: The circuit on-off control unit adopts a triode or a MOS tube.

9. A battery management system, characterized in that: The battery management system comprises a micro control unit and a mode switching circuit as claimed in any one of claims 1 to 8.

10. A vehicle, characterized in that: The vehicle is provided with a battery management system as claimed in claim 9.

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