Alternating charging protection circuit for two sections of series-connected battery cells

Abstract

The utility model provides an alternate charging protection circuit for two sections of series-connected battery cells, and particularly relates to the technical field of battery charging circuits, the alternate charging protection circuit comprises a battery charger, a master control chip, a slave control chip, a master control NMOS (N-channel Metal Oxide Semiconductor), a slave control PMOS (P-channel Metal Oxide Semiconductor) and a charging terminal, the positive electrode of the battery charger is connected with the master control chip, the slave control chip and the slave control PMOS, the negative electrode of the battery charger is connected with the master control chip, the slave control chip and the master control NMOS, the positive electrode of the first battery cell is connected with the master control chip and the slave control chip, the master control chip is connected with the master control NMOS, the slave control PMOS is connected with the positive electrode of the charging terminal, and the negative electrode of the battery charger is connected with the negative electrode of the charging terminal. And the master control NMOS is connected with the negative electrode of the charging terminal. The positive electrode and the negative electrode of the rechargeable battery are respectively controlled through the master control NMOS and the slave control PMOS, and safe alternate charging of the first battery cell and the second battery cell is realized on the premise of ensuring that the voltage of the rechargeable battery is consistent.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of battery charging circuits, in particular to a two-section series battery alternating charging protection circuit. BACKGROUND

[0002] At present, two-section battery conventional charging mostly adopts the whole charging mode, that is, an 8.5V voltage circuit charges two-section batteries, the charging circuit is simple and convenient, but when one section of the battery is overcharged, the other section of the battery is not fully charged, the charging circuit will also be closed. CONTENT

[0003] In order to solve the above technical problems, the application provides a two-section series battery alternating charging protection circuit, which comprises a battery charger, a master control chip, a slave control chip, a master control NMOS, a slave control PMOS and a charging terminal, the first section of the battery and the second section of the battery are connected in series in the battery charger, the positive electrode of the battery charger is connected with the master control chip, the slave control chip and the slave control PMOS respectively, the negative electrode of the battery charger is connected with the master control chip, the slave control chip and the master control NMOS respectively, the positive electrode of the first section of the battery is connected with the master control chip and the slave control chip respectively, the master control chip is connected with the master control NMOS, the slave control PMOS is connected with the positive electrode of the charging terminal, and the master control NMOS is connected with the negative electrode of the charging terminal.

[0004] In some embodiments, a changeover switch is further included, and the slave control PMOS is connected with the positive electrode of the charging terminal through the changeover switch.

[0005] In some embodiments, the master control chip, the slave control chip and the master control NMOS are all provided with a grounding end.

[0006] Compared with the prior art, the two-section series battery alternating charging protection circuit provided by the application, in the circuit, the negative electrode of the battery charger is controlled by the master control NMOS, the positive electrode of the battery charger is controlled by the slave control PMOS, when the charging terminal charges the first section of the battery and overcharges, the master control chip controls the negative electrode of the battery charger through the master control NMOS to disconnect the first section of the battery from the charging terminal, when the charging terminal charges the second section of the battery and overcharges, the slave control chip controls the positive electrode of the battery charger through the slave control PMOS to disconnect the second section of the battery from the charging terminal, thereby realizing the safe alternating charging of the first section of the battery and the second section of the battery under the premise of ensuring the consistency of the charging battery voltage. Therefore, the charging protection circuit provided by the application has a wide application prospect. BRIEF DESCRIPTION OF DRAWINGS

[0007] Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the implementation. The accompanying drawings are included to provide a description of some implementations and are not meant to limit the present application. Furthermore, like reference numerals are intended to represent the same components throughout all the drawings. In the drawings:

[0008] Figure 1 A structure block diagram of the two-section series battery cell alternate charging protection circuit in the present application is shown,

[0009] Figure 2 A working principle diagram of the two-section series battery cell alternate charging protection circuit in the present implementation is shown.

[0010] The reference numerals in the detailed description are as follows:

[0011] 100. battery charger

[0012] 101. first section battery cell

[0013] 102. second section battery cell

[0014] 200. master control chip

[0015] 300. slave control chip

[0016] 400. master control NMOS

[0017] 500. slave control PMOS

[0018] 600. charging terminal DETAILED DESCRIPTION

[0019] In the description of the present application, it is to be understood that the description of the orientation or positional relationship such as the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like, if not specifically stated, is based on the orientation or positional relationship shown in the drawings, and is only for the purpose of facilitating the description of the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0020] In this application, unless otherwise clearly specified and limited, the terms such as "mounting", "connection", "connecting", "fixing" and the like should be understood in a broad sense. For example, it can be fixed connection, or detachable connection, or integral; it can be mechanical connection, or electrical connection; it can be direct connection, or indirect connection through an intermediate medium; it can be the internal communication of two elements, or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in this application can be understood according to the specific circumstances.

[0021] In the description of the specification, the terms "one embodiment", "some embodiments", "example", "specific example" or "some examples" mean that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the application. In the specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any appropriate manner in any one or more embodiments or examples. In addition, the skilled in the art can combine and combine the different embodiments or examples described in the specification and the features of the different embodiments or examples without contradiction.

[0022] To solve the technical problems existing in the related art, the embodiments of the present application provide a two-section series battery cell alternating charging protection circuit. Referring to Figure 1 The two-section series battery cell alternating charging protection circuit of some embodiments of the present application includes a battery charger 100, a master control chip 200, a slave control chip 300, a master control NMOS 400, a slave control PMOS 500 and a charging terminal 600. The first section battery cell 101 and the second section battery cell 102 are connected in series in the battery charger 100. The positive electrode of the battery charger 100 is connected with the master control chip 200, the slave control chip 300 and the slave control PMOS 500 respectively. The negative electrode of the battery charger 100 is connected with the master control chip 200, the slave control chip 300 and the master control NMOS 400 respectively. The positive electrode of the first section battery cell 101 is connected with the master control chip 200 and the slave control chip 300 respectively. The master control chip 200 is connected with the master control NMOS 400. The slave control PMOS 500 is connected with the positive electrode of the charging terminal 600. The master control NMOS 400 is connected with the negative electrode of the charging terminal 600.

[0023] In the embodiment of the application, the negative pole of the battery charger 100 is controlled by the master NMOS 400, the positive pole of the battery charger 100 is controlled by the slave PMOS 500, when the charger overcharges the first section of the battery cell 101 through the charging terminal 600, the master chip 200 controls the negative pole of the battery charger 100 through the master NMOS 400 to disconnect the first section of the battery cell 101 from the charging terminal 600, when the charging terminal 600 overcharges the second section of the battery cell 102, the slave chip 300 controls the slave PMOS 500 to disconnect the second section of the battery cell 102 from the charging terminal 600, thereby realizing the safe alternate charging of the first section of the battery cell 101 and the second section of the battery cell 102 under the premise of ensuring the consistency of the voltage of the battery. Therefore, the charging protection circuit provided by the application has a wide application prospect.

[0024] As shown in Figure 2 , Figure 2 The working principle diagram of the two-section series battery cell alternate charging protection circuit of the application is shown.

[0025] In Figure 2 , B+ represents the positive pole of the second section of the battery cell 102, B- represents the negative pole of the first section of the battery cell 101, BM represents the series connection point of the first section of the battery cell 101 and the second section of the battery cell 102, U1 represents the master chip, U2 represents the slave chip, Q1 represents the master NMOS, Q2 represents the slave PMOS, Q3 and Q4 represent the changeover switch, P+ represents the positive pole of the charging terminal, P- represents the negative pole of the charging terminal, F1 represents the fuse, wherein: TP1, TP2, TP3 all represent the test point.

[0026] From Figure 2 , it can be seen that the positive pole of the battery charger 100 is connected to the D pole of the slave PMOS 500, and is connected to the 5-pin VDD of the master chip 200 through the resistor R1, and is connected to the 1-pin VDD of the slave chip 300 and the 2nd, 3rd, 4th and 5th pins through the resistor R5 and the resistor R4;

[0027] The first section of the battery cell 101 is connected to the 4-pin VC of the master chip 200 through the resistor R2, and is connected to the pin V1 of the slave chip 300 through the resistor R8;

[0028] The negative pole of the first section of the battery cell 101 is connected to the 6-pin VSS of the master chip 200 and the 7-pin VSS of the slave chip 300, and is connected to the 6th, 7th and 8th pins of the master NMOS;

[0029] The 1-pin of the master chip 200 is connected to the 5-pin of the master NMOS 400, and the 2-pin of the master chip 200 is connected to the 4-pin of the master NMOS 400;

[0030] The 8-pin of the slave chip 300 is connected to the G pole of the switch MOS Q4 through the resistor R7, and the G pole of the switch MOS Q4 is connected to the ground through the resistor R6.

[0031] The D pole of the switch MOS Q4 is connected to the G pole of the switch MOS Q3, and is connected to the F1 through the resistor R11.

[0032] The D pole of the switch MOS Q3 is connected to the G pole of the slave PMOS through the resistor R9, and is connected to the F1 through the resistor R10.

[0033] The S pole of the slave PMOS 500 is connected to the F1.

[0034] The F1 is connected to the positive pole of the charging terminal, and the master control NMOS Q1 is connected to the negative pole of the charging terminal.

[0035] Therefore, under the premise of ensuring the consistency of the voltage of the charging battery, the circuit can realize the safe alternating charging of the first and second battery cells.

[0036] In some embodiments, a switch MOS is further included, and the slave PMOS 500 is connected to the positive pole of the charging terminal 600 through the switch.

[0037] In the above embodiments, the switch MOS is used to realize the conversion between the high potential and the low potential, thereby ensuring the stability of the charging protection circuit.

[0038] In some embodiments, the master control chip 200, the slave chip 300, and the master control NMOS 400 are all provided with a grounding terminal.

[0039] In the above embodiments, the master control chip 200 controls the master control NMOS 400, the slave chip 300 controls the slave PMOS 500, and the slave switch circuit, thereby effectively ensuring the safety and stability of the charging protection circuit.

[0040] The two-section series battery cell alternating charging protection circuit provided by the present application is described in detail above. The principles and embodiments of the present application are described by using specific examples in this paper, and the above examples are only used to help understand the core idea of the present application. It should be pointed out that for ordinary skilled persons in the technical field, some improvements and modifications can be made to the present application without departing from the principles of the present application, and these improvements and modifications also fall within the protection scope of the claims of the present application.

Claims

1. A two-section series cell alternate charging protection circuit, characterized by, The application relates to a battery charger (100), a master control chip (200), a slave control chip (300), a master control NMOS (400), a slave control PMOS (500) and a charging terminal (600), wherein the first power saving chip (101) and the second power saving chip (102) are connected in series in the battery charger (100), the positive pole of the battery charger (100) is connected with the master control chip (200), the slave control chip (300) and the slave control PMOS (500) respectively, the negative pole of the battery charger (100) is connected with the master control chip (200), the slave control chip (300) and the master control NMOS (400) respectively, the positive pole of the first power saving chip (101) is connected with the master control chip (200) and the slave control chip (300) respectively, the master control chip (200) is connected with the master control NMOS (400), the slave control PMOS (500) is connected with the positive pole of the charging terminal (600), and the master control NMOS (400) is connected with the negative pole of the charging terminal (600).

2. The two-section series connection cell alternate charging protection circuit according to claim 1, wherein, The application further comprises a change-over switch, and the slave control PMOS (500) is connected with the positive pole of the charging terminal (600) through the change-over switch.

3. The two-section series connection cell alternate charging protection circuit according to claim 1, wherein, The master control chip (200), the slave control chip (300) and the master control NMOS (400) are all provided with grounding ends.

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