Battery communication circuit

Abstract

The embodiment of the utility model relates to the technical field of power-assisted bicycles, in particular to a battery communication circuit. The first interface circuit of the battery communication circuit can send or receive communication signals to the second interface circuit through the first sending circuit and the first receiving circuit, and similarly, the second interface circuit can send or receive communication signals to the first interface circuit through the second sending circuit and the second receiving circuit. Therefore, single-line communication connection between the first interface circuit and the second interface circuit is realized. Meanwhile, the communication interface can also be connected through a detection circuit and used for electrically detecting the battery management system, so that a detection line is further integrated in a single communication line, and the number of communication wire harnesses is reduced. According to the utility model, not only is poor contact caused by a large number of connecting wire harnesses avoided, but also the power-assisted bicycle is more integrated and higher in stability.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of power-assisted bicycle, specifically relates to a battery communication circuit. BACKGROUND

[0002] In the field of power-assisted bicycle, power-assisted bicycle is a new type of two-wheeled vehicle, and belongs to a kind of bicycle, with battery as auxiliary power source, with motor, and with power-assisted system, can realize the integration of human-powered cycling and motor-assisted new type of transport vehicle.In prior art, due to the limitation of power-assisted bicycle structure, the simpler the circuit line of power-assisted bicycle is, the more stable and reliable the vehicle body structure is.But most of the power supply accessories need 2 charging wires, 2 bidirectional serial port transceiving data lines, a total of 4 lines to connect to complete charging and transceiving function on communication data.The more connection harness, not only design is more bloated, and the risk of poor contact is greater. CONTENT OF UTILITY MODEL

[0003] In view of the above problem, the utility model embodiment provides battery communication circuit, solve the problem that in prior art, power supply accessories need 2 charging wires, 2 bidirectional serial port transceiving data lines, a total of 4 lines to connect to complete charging and transceiving function on communication data.The more connection harness, not only design is more bloated, and the risk of poor contact is greater.

[0004] In the first aspect, the utility model provides a battery communication circuit, applied to the power-assisted bicycle with battery management system, and the circuit includes:

[0005] First interface circuit has first communication interface, and the first interface circuit includes first sending circuit, first receiving circuit and detection circuit, and the first sending circuit, first receiving circuit and detection circuit are connected with communication equipment, and the first sending circuit, first receiving circuit and detection circuit are connected with first communication interface;

[0006] And second interface circuit has second communication interface connected with the first communication interface, and the second interface circuit includes second sending circuit and second receiving circuit, and the second sending circuit and second receiving circuit are connected with battery management system, and the second sending circuit and second receiving circuit are connected with second communication interface;

[0007] Wherein, the first interface circuit is connected with the first interface circuit single-line communication by first sending circuit, first receiving circuit and detection circuit.

[0008] In some optional embodiments, the first interface circuit is further provided with first TX interface, first RX interface and detection output end;

[0009] The input end of the first sending circuit is connected with the communication device through a first TX interface, and the output end of the first sending circuit is connected with the first communication interface;

[0010] The input end of the first receiving circuit is connected with the first communication interface, and the output end of the first receiving circuit is connected with the communication device through a first RX interface;

[0011] The input end of the detection circuit is connected with the first communication interface, and the output end of the detection circuit is connected with the communication device through a detection output end.

[0012] In some optional embodiments, the detection circuit comprises a MOS tube Q1, a resistor R1, a resistor R2, a resistor R3, a resistor R4 and a capacitor C1,

[0013] The gate of the MOS tube Q1 is connected with the first communication interface through the resistor R1, the source is connected with a first power supply interface for power supply, and the drain is connected with a detection output end, a first end of a resistor R3 and a first end of a capacitor C1 through a resistor R2; a second end of the resistor R3 and a second end of the capacitor C1 are grounded, and the resistor R4 is connected between the gate and the source of the MOS tube Q1.

[0014] In some optional embodiments, the first sending circuit comprises a MOS tube Q2, a MOS tube Q3, a resistor R5, a resistor R6, a resistor R7, a resistor R8, a resistor R9 and a capacitor C2;

[0015] The resistor R5 is connected between the first TX interface and the first RX interface; the gate of the MOS tube Q2 is connected with the first TX interface through the resistor R6, the drain is connected with the gate of the MOS tube Q3, the resistor R9 and the resistor R8, and the source is grounded; the other end of the resistor R8 is connected with a second power supply interface for power supply, and the other end of the resistor R9 is grounded; the resistor R7 is connected between the gate and the source of the MOS tube Q2;

[0016] The drain of the MOS tube Q3 is connected with the first communication interface, and the source is grounded; the first end of the capacitor C2 is connected with the first communication interface, and the second end of the capacitor C2 is grounded.

[0017] In some optional embodiments, the first receiving circuit comprises a MOS tube Q4, a MOS tube Q5, a resistor R11, a resistor R12, a resistor R13, a resistor R14, a resistor R15, a resistor R16, a resistor R17, a resistor R18, a resistor R19 and a capacitor C3;

[0018] The first end of the resistor R13 is connected with the first power supply interface for power supply, and the second end of the resistor R13 is connected with the first communication interface; the first end of the resistor R14 is connected with the second power supply interface and the capacitor C3, and the second end of the resistor R14 is connected with the second communication interface; the other end of the capacitor C3 is grounded;

[0019] The gate of the MOS tube Q4 is connected with the resistor R11 and the resistor R12, the drain is connected with the resistor R15 and the resistor R16, and the source is grounded; the other end of the resistor R16 is connected with the gate of the MOS tube Q5 and the resistor R7;

[0020] The drain of the MOS tube Q5 is connected with the resistor R18 and the resistor R19, and the source is grounded; the other end of the resistor R19 is connected with the first RX interface; the other ends of the resistor R15 and the resistor R18 are connected with the second power supply interface for power supply; and the other end of the resistor R17 is grounded.

[0021] In some optional embodiments, the second interface circuit is further provided with a second TX interface and a second RX interface;

[0022] The input end of the second sending circuit is connected with the battery management system through the second TX interface, and the output end of the first sending circuit is connected with the second communication interface;

[0023] The input end of the second receiving circuit is connected with the second communication interface, and the output end of the second receiving circuit is connected with the battery management system through the second RX interface.

[0024] In some optional embodiments, the second sending circuit comprises a MOS tube Q6, a MOS tube Q7, a resistor R20, a resistor R21, a resistor R22, a resistor R23, a resistor R24, a resistor R25, a resistor R26 and a capacitor C4;

[0025] The second TX interface is connected with the second RX interface through the resistor R20;

[0026] The gate of the MOS tube Q6 is connected with the second TX interface through the resistor R21, the drain is connected with the gate of the MOS tube Q7, the resistor R23 and the resistor R24, and the source is grounded; the other end of the resistor R23 is connected with the third power supply interface; the other end of the resistor R24 is grounded; and the resistor R22 is connected between the gate and the source of the MOS tube Q6;

[0027] The collector of the MOS tube Q7 is connected with the second communication interface, the resistor R25 and the resistor R26, the other end of the resistor R25 is connected with the third power supply interface, and the other end of the resistor R26 is grounded; the first end of the capacitor C4 is connected with the second communication interface, and the second end of the capacitor C4 is grounded.

[0028] In some alternative embodiments, the second receiving circuit comprises MOS tube Q8, MOS tube Q9, resistor R27, resistor R28, resistor R29, resistor R30, resistor R31, resistor R32, resistor R33 and capacitor C5;

[0029] The gate of the MOS tube Q8 is connected with the resistor R27 and resistor R28, the source is connected with resistor R29 and resistor R30, and the source is grounded; the other end of the resistor R27 is connected with the second communication interface; the other end of the resistor R29 is connected with the third power supply interface to take power; the other end of the resistor R30 is connected with the gate of the MOS tube Q9 and the resistor R31; the other end of the resistor R28 and the other end of the resistor R31 are grounded;

[0030] The drain of the MOS tube Q9 is connected with the resistor R32 and resistor R33, and the source is grounded; the other end of the resistor R32 is connected with the third power supply interface to take power; the other end of the resistor R33 is connected with the second RX interface; the capacitor C5 is connected between the first power supply interface and the power supply ground.

[0031] In some alternative embodiments, the second sending circuit comprises transistor Q10, transistor Q11, resistor R34, resistor R35, resistor R36, resistor R37 and resistor R38; wherein the base of the transistor Q10 is connected with the second TX interface through the resistor R34, the emitter is connected with the third power supply interface, and the collector is connected with the base of the transistor Q11 and the resistor R37 through the resistor R36; the resistor R35 is connected between the base and the collector of the transistor; the collector of the transistor Q11 is connected with the second communication interface through the resistor R38, and the emitter is grounded.

[0032] In some alternative embodiments, the second receiving circuit comprises transistor Q12, transistor Q13, resistor R39, resistor R40, resistor R41, resistor R42, resistor R43, resistor R44, resistor R45 and resistor R46; wherein the base of the transistor Q12 is connected with the second communication interface through the resistor R39, the collector is connected with the base of the transistor Q13 and the resistor R42 through the resistor R41, and the emitter is grounded; the emitter of the transistor Q13 is connected with the third power supply interface to take power, the collector is connected with the resistor R45 and resistor R46, the other end of the resistor R45 is connected with the second RX interface; the other end of the resistor R46 and the other end of the resistor R43 are both grounded; the other end of the resistor R42 is connected with the third power supply interface to take power.

[0033] Compared with the prior art, the utility model discloses a battery communication circuit, which comprises a first interface circuit and a second interface circuit, and the first interface circuit comprises a first sending circuit, a first receiving circuit and a detection circuit, the second interface circuit comprises a second sending circuit and a second receiving circuit, and the first interface circuit and the second interface circuit are communicated and connected through a first communication interface and a second communication interface.In this embodiment, the first interface circuit can send or receive communication signals to the second interface circuit through the first sending circuit and the first receiving circuit, and similarly, the second interface circuit can send or receive communication signals to the first interface circuit through the second sending circuit and the second receiving circuit, so that the first interface circuit and the second interface circuit are single-wire communication connected, and the communication interface of the utility model can also be connected through the detection circuit for electrical detection of the battery management system, further realizing integration of the detection line in the communication single line to reduce the communication wire harness.The utility model not only avoids poor contact caused by the multiple connection wire harness, but also makes the power-assisted bicycle more integrated and more stable.

[0034] The above description is only a summary of the technical scheme of the utility model embodiment, in order to more clearly understand the technical means of the utility model embodiment, which can be implemented according to the content of the specification, and in order to make the above and other purposes, characteristics and advantages of the utility model embodiment more obvious and easy to understand, the specific implementation manner of the utility model is as follows. BRIEF DESCRIPTION OF DRAWINGS

[0035] The drawings are only used to show the embodiments and are not considered as limiting the utility model. Moreover, the same reference signs are used to represent the same parts throughout the drawings. In the drawings:

[0036] Figure 1 The structure schematic diagram of the battery communication circuit provided by the utility model embodiment 1 is shown.

[0037] Figure 2 The circuit principle diagram of the first interface circuit provided by the utility model embodiment 2 is shown.

[0038] Figure 3 The circuit principle diagram of the second interface circuit provided by the utility model embodiment 2 is shown.

[0039] Figure 4 The circuit principle diagram of the second interface circuit provided by the utility model embodiment 3 is shown.

[0040] Reference signs:

[0041] 100, first interface circuit, 110, first sending circuit, 120, first receiving circuit, 130, detection circuit,

[0042] 200, second interface circuit; 210, second sending circuit; 220, second receiving circuit. DETAILED DESCRIPTION

[0043] Exemplary embodiments of the present application will be described in greater detail below with reference to the accompanying drawings. While exemplary embodiments of the present application are shown in the drawings, it is understood that the present application can be embodied in various forms and should not be limited by the embodiments set forth herein.

[0044] Embodiment 1

[0045] Figure 1 The present application shows a first embodiment of a battery communication circuit applied to a power-assisted bicycle with a battery management system. The battery communication circuit is used to connect the battery management system and the communication device, so as to reduce the connection harness of the battery management system and the communication device, thereby avoiding poor contact caused by too many connection harnesses, and making the power-assisted bicycle more integrated and more stable. The circuit includes a first interface circuit 100 and a first interface circuit 200.

[0046] The first interface circuit 100 has a first communication interface COM1. The first interface circuit 100 includes a first sending circuit 110, a first receiving circuit 120 and a detection circuit 130. The first sending circuit, the first receiving circuit and the detection circuit are connected with the communication device, and the first sending circuit, the first receiving circuit and the detection circuit are connected with the first communication interface COM1. In this embodiment, the first interface circuit can be arranged at the communication interface of the power-assisted bicycle or arranged at the external communication device, used to convert the sending signal of the external communication device into a single-line signal and output through the first communication interface COM1, and convert the single-line signal of the battery management system into an RX signal and output to the communication device through the first communication interface COM1. In addition, the detection circuit is also arranged in the first interface circuit, which can be used for electrical detection of the battery management system through the first communication interface COM1.

[0047] The second interface circuit 200 has a second communication interface COM2 connected with the first communication interface. The second interface circuit 200 includes a second sending circuit 210 and a second receiving circuit 220. The second sending circuit and the second receiving circuit are connected with the battery management system, and the second sending circuit and the second receiving circuit are connected with the second communication interface COM2. In this embodiment, the second interface circuit can be arranged at the communication interface of the power-assisted bicycle or integrated in the battery management system. The second interface circuit is used to convert the sending signal of the battery management system into a single-line signal and output to the first interface circuit through the second communication interface COM2, and convert the single-line signal received through the second communication interface COM2 into an RX signal and output to the communication device.

[0048] The utility model provides a kind of battery communication circuit, it includes first interface circuit and second interface circuit, and first interface circuit includes first sending circuit, first receiving circuit and detection circuit, second interface circuit includes second sending circuit and second receiving circuit, first interface circuit and second interface circuit are connected by first communication interface COM1 and second communication interface COM2 communication.In the embodiment, first interface circuit can be sent or received communication signal to second interface circuit by first sending circuit and first receiving circuit, similarly, second interface circuit can be sent or received communication signal to first interface circuit by second sending circuit and second receiving circuit, to realize first interface circuit and second interface circuit single line communication connection;Meanwhile, the communication interface of the utility model can also be connected for electrical detection to battery management system by detection circuit, further realizes that detection line is integrated in communication single line, to reduce communication wiring harness.The utility model not only avoids the contact of multiple connection wiring harness and causes poor, and make power-assisted bicycle more integrated and higher stability.

[0049] Embodiment 2:

[0050] Based on embodiment 1, the second embodiment of the battery communication circuit is provided, and the first interface circuit and the second interface circuit are further limited in the embodiment.

[0051] In some optional embodiments, referring to Figures 2-3 , first interface circuit is further provided with first TX interface TX1, first RX interface RX1 and detection output end BAT_DE;The input end of first sending circuit is connected with communication equipment through first TX interface TX1, and the output end of first sending circuit is connected with first communication interface COM1;The input end of first receiving circuit is connected with first communication interface COM1, and the output end of first receiving circuit is connected with communication equipment through first RX interface RX1;The input end of detection circuit is connected with first communication interface COM1, and the output end of detection circuit is connected with communication equipment through detection output end BAT_DE.

[0052] In the specific example of detection circuit, referring to Figure 2The detection circuit comprises a MOS transistor Q1, a resistor R1, a resistor R2, a resistor R3, a resistor R4 and a capacitor C1. The gate of the MOS transistor Q1 is connected with the first communication interface COM1 through the resistor R1, the source is connected with the first power interface for power supply, and the drain is connected with the detection output end BAT_DE, the first end of the resistor R3 and the first end of the capacitor C1 through the resistor R2. The second end of the resistor R3 and the second end of the capacitor C1 are grounded, and the resistor R4 is connected between the gate and the source of the MOS transistor Q1. In the embodiment, the detection circuit receives the signal from the battery management system through the first communication interface COM1, so that the MOS transistor Q1 is turned on, the detection output end BAT_DE is connected with the first power interface for power supply, the detection output end BAT_DE is high, and the high-level signal is output to the communication device. The resistor R1, the resistor R2, the resistor R3, the resistor R4 and the capacitor C1 are used for stabilizing the circuit and making the detection circuit work normally. In addition, the detection circuit can be used for contact test, that is, the first communication interface COM1 and the second communication interface COM2 are connected, the access signal is acquired through the first communication interface COM1, and the signal is transmitted to the communication device, so that the first sending circuit, the first receiving circuit, the second sending circuit and the second receiving circuit start to work. The first power interface +5V can be a 5V power interface, wherein the first power interface +5V can be a power interface on the power-assisted bicycle or a power interface of the communication device.

[0053] In a specific example of the first sending circuit, referring to Figure 2 The first sending circuit comprises a MOS transistor Q2, a MOS transistor Q3, a resistor R5, a resistor R6, a resistor R7, a resistor R8, a resistor R9 and a capacitor C2. The resistor R5 is connected between the first TX interface TX1 and the first RX interface RX1. The gate of the MOS transistor Q2 is connected with the first TX interface TX1 through the resistor R6, the drain is connected with the gate of the MOS transistor Q3, the resistor R9 and the resistor R8, and the source is grounded. The other end of the resistor R8 is connected with the second power interface for power supply, and the other end of the resistor R9 is grounded. The resistor R7 is connected between the gate and the source of the MOS transistor Q2. The drain of the MOS transistor Q3 is connected with the first communication interface COM1, and the source is grounded. The first end of the capacitor C2 is connected with the first communication interface COM1, and the second end of the capacitor C2 is grounded.

[0054] In the embodiment, when the first TX interface TX1 receives the electrical signal of the communication device, the MOS tube Q2 and the MOS tube Q3 can be turned on or turned off, so as to change the level signal of the first communication interface COM1, and output to the second interface circuit for identification processing. The resistors R5, R6, R7, R8, R9 and the capacitor C2 are used for stabilizing the circuit, so that the first sending circuit works normally. The second power supply interface can be a 3.3V power supply interface, wherein the second power supply interface can be a power supply interface on the power-assisted bicycle or a power supply interface of the communication device.

[0055] In the specific example of the first receiving circuit, referring to Figure 2 , the first receiving circuit comprises the MOS tube Q4, the MOS tube Q5, the resistors R11, R12, R13, R14, R15, R16, R17, R18, R19 and the capacitor C3. The first end of the resistor R13 is connected to the first power supply interface for power supply, and the second end of the resistor R13 is connected to the first communication interface COM1. The first end of the resistor R14 is connected to the second power supply interface and the capacitor C3, and the second end of the resistor R14 is connected to the second communication interface COM2. The other end of the capacitor C3 is grounded. The gate of the MOS tube Q4 is connected to the resistors R11 and R12, the drain is connected to the resistors R15 and R16, and the source is grounded. The other end of the resistor R16 is connected to the gate of the MOS tube Q5 and the resistor R7. The drain of the MOS tube Q5 is connected to the resistors R18 and R19, and the source is grounded. The other end of the resistor R19 is connected to the first RX interface RX1. The other ends of the resistors R15 and R18 are connected to the second power supply interface for power supply. The other end of the resistor R17 is grounded.

[0056] In the embodiment, when the first communication interface COM1 receives the electrical signal of the second interface circuit, the MOS tube Q4 and the MOS tube Q5 can be turned on or turned off, so as to convert the level signal of the first communication interface COM1 into the RX signal of the first RX interface RX1 and output to the communication device, so as to output to the communication device for identification processing. The resistors R11, R12, R13, R14, R15, R16, R17, R18, R19 and the capacitor C3 are used for stabilizing the circuit, so that the first receiving circuit works normally. The second power supply interface 3.3V can be a 3.3V power supply interface, wherein the second power supply interface 3.3V can be a power supply interface on the power-assisted bicycle or a power supply interface of the communication device.

[0057] In some optional embodiments, referring to Figure 3, the second interface circuit is further provided with a second TX interface TX2 and a second RX interface RX2; an input end of the second sending circuit is connected with the battery management system through the second TX interface TX2, and an output end of the first sending circuit is connected with the second communication interface COM2; an input end of the second receiving circuit is connected with the second communication interface COM2, and an output end of the second receiving circuit is connected with the battery management system through the second RX interface RX2.

[0058] In a specific example of the second sending circuit, referring to Figure 3 , the second sending circuit comprises MOS tube Q6, MOS tube Q7, resistor R20, resistor R21, resistor R22, resistor R23, resistor R24, resistor R25, resistor R26 and capacitor C4; wherein the second TX interface TX2 is connected with the second RX interface RX2 through the resistor R20; the gate of the MOS tube Q6 is connected with the second TX interface TX2 through the resistor R21, the drain is connected with the gate of the MOS tube Q7, the resistor R23 and the resistor R24, and the source is grounded; the other end of the resistor R23 is connected with the third power supply interface; the other end of the resistor R24 is grounded; the resistor R22 is connected between the gate and the source of the MOS tube Q6; the collector of the MOS tube Q7 is connected with the second communication interface COM2, the resistor R25 and the resistor R26, the other end of the resistor R25 is connected with the third power supply interface, and the other end of the resistor R26 is grounded; the first end of the capacitor C4 is connected with the second communication interface COM2, and the second end of the capacitor C4 is grounded.

[0059] In the embodiment, when the second TX interface TX2 receives the electric signal of the battery management system, the MOS tube Q6 and the MOS tube Q7 can be turned on or turned off, so as to change the level signal of the second communication interface COM2, thereby outputting to the first interface circuit for identification processing. The resistor R20, the resistor R21, the resistor R22, the resistor R23, the resistor R24, the resistor R25, the resistor R26 and the capacitor C4 are used for stabilizing the circuit and making the first sending circuit work normally. The third power supply interface can be a B3.3V power supply interface, wherein the third power supply interface B3.3V can be a power supply interface of the battery module on the power-assisted bicycle.

[0060] In a specific example of the second receiving circuit, referring to Figure 3The second receiving circuit comprises MOS tube Q8, MOS tube Q9, resistor R27, resistor R28, resistor R29, resistor R30, resistor R31, resistor R32, resistor R33 and capacitor C5; wherein the gate of the MOS tube Q8 is connected with the resistor R27 and the resistor R28, the source is connected with the resistor R29 and the resistor R30, and the source is grounded; the other end of the resistor R27 is connected with the second communication interface COM2; the other end of the resistor R29 is connected with the third power supply interface for power supply; the other end of the resistor R30 is connected with the gate of the MOS tube Q9 and the resistor R31; the other end of the resistor R28 and the other end of the resistor R31 are grounded; the drain of the MOS tube Q9 is connected with the resistor R32 and the resistor R33, and the source is grounded; the other end of the resistor R32 is connected with the third power supply interface for power supply; the other end of the resistor R33 is connected with the second RX interface RX2; and the capacitor C5 is connected between the first power supply interface and the power supply ground.

[0061] In the embodiment, when the second communication interface COM2 receives the electrical signal of the first interface circuit, the MOS tube Q8 and the MOS tube Q9 can be turned on or turned off, so that the level signal of the second communication interface COM2 is converted into the RX signal of the second RX interface RX2 and output to the battery management system, so as to be output to the battery management system for identification processing. The resistor R27, the resistor R28, the resistor R29, the resistor R30, the resistor R31, the resistor R32, the resistor R33 and the capacitor C5 are used for stabilizing the circuit and making the first receiving circuit work normally. The third power supply interface B3.3V can be a 3.3V power supply interface, wherein the third power supply interface B3.3V can be a power supply interface of a battery module on the power-assisted bicycle.

[0062] The utility model provides a kind of battery communication circuit, it includes first interface circuit and second interface circuit, and first interface circuit includes first sending circuit, first receiving circuit and detection circuit, second interface circuit includes second sending circuit and second receiving circuit, and first interface circuit and second interface circuit are connected by first communication interface COM1 and second communication interface COM2 communication.In the embodiment, first interface circuit can be sent or received communication signal to second interface circuit by first sending circuit and first receiving circuit, similarly, second interface circuit can be sent or received communication signal to first interface circuit by second sending circuit and second receiving circuit, to realize first interface circuit and second interface circuit single line communication connection;Meanwhile, the communication interface of the utility model can also be connected for electrical detection to battery management system by detection circuit, further realizes that detection line is integrated in communication single line, to reduce communication wiring harness.The utility model not only avoids the contact of many connection wiring harnesss to be bad, and make power-assisted bicycle more integrated and higher stability.

[0063] Embodiment 3:

[0064] The third embodiment of the battery communication circuit is provided based on the first embodiment and the second embodiment. Compared with the second embodiment, the third embodiment provides a solution different from the second interface circuit of the second embodiment.

[0065] In some optional embodiments, referring to Figure 4 , the second interface circuit is further provided with a second TX interface TX2 and a second RX interface RX2; an input end of the second sending circuit is connected with the battery management system through the second TX interface TX2, and an output end of the first sending circuit is connected with the second communication interface COM2; an input end of the second receiving circuit is connected with the second communication interface COM2, and an output end of the second receiving circuit is connected with the battery management system through the second RX interface RX2.

[0066] In some specific embodiments, referring to Figure 4 , the second sending circuit includes a transistor Q10, a transistor Q11, a resistor R34, a resistor R35, a resistor R36, a resistor R37 and a resistor R38; the base of the transistor Q10 is connected with the second TX interface TX2 through the resistor R34, the emitter is connected with the third power supply interface, and the collector is connected with the base of the transistor Q11 and the resistor R37 through the resistor R36; the resistor R35 is connected between the base and the collector of the transistor; the collector of the transistor Q11 is connected with the second communication interface COM2 through the resistor R38, and the emitter is grounded.

[0067] In the embodiment, when the second TX interface TX2 receives the electrical signal of the battery management system, the transistor Q10 and the transistor Q11 can be turned on or turned off, so as to change the level signal of the second communication interface COM2, and then output to the first interface circuit for identification processing. The resistor R34, the resistor R35, the resistor R36, the resistor R37 and the resistor R38 are used to stabilize the circuit and make the first sending circuit work normally. The third power supply interface B3.3V can be a 3.3V power supply interface, wherein the third power supply interface B3.3V can be a power supply interface of the battery module on the power-assisted bicycle.

[0068] In some specific embodiments, referring to Figure 4The second receiving circuit comprises a transistor Q12, a transistor Q13, a resistor R39, a resistor R40, a resistor R41, a resistor R42, a resistor R43, a resistor R44, a resistor R45 and a resistor R46; wherein the base of the transistor Q12 is connected with the second communication interface COM2 through the resistor R39, the collector is connected with the base of the transistor Q13 and the resistor R42 through the resistor R41, and the emitter is grounded; the emitter of the transistor Q13 is connected with the third power supply interface for power supply, the collector is connected with the resistor R45 and the resistor R46, and the other end of the resistor R45 is connected with the second RX interface RX2; the other end of the resistor R46 and the other end of the resistor R43 are both grounded; and the other end of the resistor R42 is connected with the third power supply interface for power supply.

[0069] In the embodiment, when the second communication interface COM2 receives the electrical signal of the first interface circuit, the transistor Q12 and the transistor Q13 can be turned on or turned off, so that the level signal of the second communication interface COM2 is converted into the RX signal of the second RX interface RX2 and output to the battery management system, thereby being output to the battery management system for identification processing. The resistor R39, the resistor R40, the resistor R41, the resistor R42, the resistor R43, the resistor R44, the resistor R45 and the resistor R46 are used for stabilizing the circuit and enabling the first receiving circuit to work normally. The third power supply interface B3.3V can be a 3.3V power supply interface, wherein the third power supply interface B3.3V can be a power supply interface of a battery module on the power-assisted bicycle.

[0070] The utility model provides a kind of battery communication circuit, it includes first interface circuit and second interface circuit, and first interface circuit includes first sending circuit, first receiving circuit and detection circuit, second interface circuit includes second sending circuit and second receiving circuit, and the first interface circuit and second interface circuit are connected by first communication interface COM1 and second communication interface COM2 communication connection.In the embodiment, first interface circuit can be sent or received communication signal to second interface circuit by first sending circuit and first receiving circuit, similarly, second interface circuit can be sent or received communication signal to first interface circuit by second sending circuit and second receiving circuit, to realize first interface circuit and second interface circuit single line communication connection;Meanwhile, the communication interface of the utility model can also be connected for electrical detection to battery management system by detection circuit, further realizes that detection line is integrated in communication single line, to reduce communication wiring harness.The utility model not only avoids the poor contact caused by many connection wiring harnesses, and makes power-assisted bicycle more integrated and higher stability.

[0071] The algorithms or displays provided herein are not inherently related to any particular computer, virtual system, or other apparatus.

[0072] In the description provided herein, numerous specific details are set forth. However, it is understood that embodiments of the application can be practiced without these specific details. In other instances, well-known methods, structures and techniques have not been described in detail in order to avoid obscuring the understanding of this description. Like reference numerals refer to like elements throughout. Similarly, while operations are depicted in the drawings in a particular order, this should not be understood as requiring such order because the order of operations can change and certain operations can be skipped or added.

[0073] It will be understood by those within the art that, in some embodiments, substances or modules can be adapted to perform the same functionality as other substances or modules. Substances and / or modules performing the same or similar functions can also be grouped together even if the functions are performed with no direct communication between these substances and / or modules. Substances and / or modules can also be adapted to perform only a subset of the functions performed by other substances or modules.

[0074] It should be noted that the above-mentioned embodiments illustrate rather than limit the application, and that those skilled in the art will be able to design many alternative embodiments without departing from the scope of the appended claims. In the claims, any reference signs placed between parentheses shall not be construed as limiting the claim. The word 'comprising' does not exclude the presence of elements or steps other than those listed in a claim. The word 'a' or 'an' preceding an element does not exclude the presence of a plurality of such elements. The application can be implemented by means of both hardware and software, and any combination thereof. In a unit claim, any reference signs placed between parentheses shall not be construed as limiting the claim. The use of the word 'at least' followed by a list of one or more items does not exclude additional such items. The use of the words 'one' or 'the' to refer to an element or an action of any claim does not exclude a combination of the elements or actions, and vice versa. The word 'comprising' does not exclude the presence of elements or steps other than those listed in a claim. The word 'a' or 'an' preceding an element does not exclude the presence of a plurality of such elements. The application can be implemented by means of both hardware and software, and any combination thereof. In a unit claim, any reference signs placed between parentheses shall not be construed as limiting the claim. The use of the word 'at least' followed by a list of one or more items does not exclude additional such items. The use of the words 'one' or 'the' to refer to an element or an action of any claim does not exclude a combination of the elements or actions, and vice versa.

Claims

1. A battery communication circuit, characterized by comprising: Applied to an assisted bicycle with a battery management system, the circuit comprises: a first interface circuit having a first communication interface, the first interface circuit comprising a first sending circuit, a first receiving circuit and a detection circuit, the first sending circuit, the first receiving circuit and the detection circuit being connected with a communication device, and the first sending circuit, the first receiving circuit and the detection circuit being connected with the first communication interface; and a second interface circuit having a second communication interface connected with the first communication interface, the second interface circuit comprising a second sending circuit and a second receiving circuit, the second sending circuit and the second receiving circuit being connected with the battery management system, and the second sending circuit and the second receiving circuit being connected with the second communication interface; wherein the first interface circuit is connected with the first interface circuit through the first sending circuit, the first receiving circuit and the detection circuit by single-wire communication.

2. The battery communication circuit of claim 1, wherein, The first interface circuit is further provided with a first TX interface, a first RX interface and a detection output end; the input end of the first sending circuit is connected with the communication device through the first TX interface, and the output end of the first sending circuit is connected with the first communication interface; the input end of the first receiving circuit is connected with the first communication interface, and the output end of the first receiving circuit is connected with the communication device through the first RX interface; the input end of the detection circuit is connected with the first communication interface, and the output end of the detection circuit is connected with the communication device through the detection output end.

3. The battery communication circuit of claim 2, wherein, The detection circuit comprises a MOS tube Q1, a resistor R1, a resistor R2, a resistor R3, a resistor R4 and a capacitor C1, wherein the gate of the MOS tube Q1 is connected with the first communication interface through the resistor R1, the source is connected with a first power supply interface for power supply, and the drain is connected with the detection output end, the first end of the resistor R3 and the first end of the capacitor C1 through the resistor R2; the second end of the resistor R3 and the second end of the capacitor C1 are grounded, and the resistor R4 is connected between the gate and the source of the MOS tube Q1.

4. The battery communication circuit of claim 2, wherein, The first sending circuit comprises a MOS tube Q2, a MOS tube Q3, a resistor R5, a resistor R6, a resistor R7, a resistor R8, a resistor R9 and a capacitor C2; wherein the resistor R5 is connected between the first TX interface and the first RX interface; the gate of the MOS tube Q2 is connected with the first TX interface through the resistor R6, the drain is connected with the gate of the MOS tube Q3, the resistor R9 and the resistor R8, and the source is grounded; the other end of the resistor R8 is connected with a second power supply interface for power supply, and the other end of the resistor R9 is grounded; the resistor R7 is connected between the gate and the source of the MOS tube Q2; the drain of the MOS tube Q3 is connected with the first communication interface, and the source is grounded; the first end of the capacitor C2 is connected with the first communication interface, and the second end of the capacitor C2 is grounded.

5. The battery communication circuit of claim 4, wherein, The first receiving circuit comprises a MOS tube Q4, a MOS tube Q5, a resistor R11, a resistor R12, a resistor R13, a resistor R14, a resistor R15, a resistor R16, a resistor R17, a resistor R18, a resistor R19 and a capacitor C3; The first end of the resistor R13 is connected with the first power supply interface for power supply, and the second end of the resistor R13 is connected with the first communication interface; the first end of the resistor R14 is connected with the second power supply interface and the capacitor C3, and the second end of the resistor R14 is connected with the second communication interface; the other end of the capacitor C3 is grounded; The gate of the MOS tube Q4 is connected with the resistor R11 and the resistor R12, the drain is connected with the resistor R15 and the resistor R16, and the source is grounded; the other end of the resistor R16 is connected with the gate of the MOS tube Q5 and the resistor R7; The drain of the MOS tube Q5 is connected with the resistor R18 and the resistor R19, and the source is grounded; the other end of the resistor R19 is connected with the first RX interface; the other ends of the resistor R15 and the resistor R18 are connected with the second power supply interface for power supply; and the other end of the resistor R17 is grounded.

6. The battery communication circuit of claim 1, wherein, The second interface circuit is provided with a second TX interface and a second RX interface; The input end of the second sending circuit is connected with the battery management system through the second TX interface, and the output end of the first sending circuit is connected with the second communication interface; The input end of the second receiving circuit is connected with the second communication interface, and the output end of the second receiving circuit is connected with the battery management system through the second RX interface.

7. The battery communication circuit of claim 6, wherein, The second sending circuit comprises a MOS tube Q6, a MOS tube Q7, a resistor R20, a resistor R21, a resistor R22, a resistor R23, a resistor R24, a resistor R25, a resistor R26 and a capacitor C4; The second TX interface is connected with the second RX interface through the resistor R20; The gate of the MOS tube Q6 is connected with the second TX interface through the resistor R21, the drain is connected with the gate of the MOS tube Q7, the resistor R23 and the resistor R24, and the source is grounded; the other end of the resistor R23 is connected with the third power supply interface; the other end of the resistor R24 is grounded; and the resistor R22 is connected between the gate and the source of the MOS tube Q6; The collector of the MOS tube Q7 is connected with the second communication interface, the resistor R25 and the resistor R26, the other end of the resistor R25 is connected with the third power supply interface, the other end of the resistor R26 is grounded; the first end of the capacitor C4 is connected with the second communication interface, and the second end of the capacitor C4 is grounded.

8. The battery communication circuit of claim 7, wherein, The second receiving circuit comprises a MOS tube Q8, a MOS tube Q9, a resistor R27, a resistor R28, a resistor R29, a resistor R30, a resistor R31, a resistor R32, a resistor R33 and a capacitor C5; The gate of the MOS tube Q8 is connected with the resistor R27 and the resistor R28, the source is connected with the resistor R29 and the resistor R30, and the source is grounded; the other end of the resistor R27 is connected with the second communication interface; the other end of the resistor R29 is connected with the third power supply interface for power supply; the other end of the resistor R30 is connected with the gate of the MOS tube Q9 and the resistor R31; the other end of the resistor R28 and the other end of the resistor R31 are grounded; The drain of the MOS tube Q9 is connected with the resistance R32 and the resistance R33, and the source is grounded; the other end of the resistance R32 is connected with the third power supply interface for power supply; the other end of the resistance R33 is connected with the second RX interface; and the capacitor C5 is connected between the first power supply interface and the power supply ground.

9. The battery communication circuit of claim 6, wherein, The second sending circuit comprises a transistor Q10, a transistor Q11, a resistance R34, a resistance R35, a resistance R36, a resistance R37 and a resistance R38; wherein the base of the transistor Q10 is connected with the second TX interface through the resistance R34, the emitter is connected with the third power supply interface, and the collector is connected with the base of the transistor Q11 and the resistance R37 through the resistance R36; the resistance R35 is connected between the base and the collector of the transistor; the collector of the transistor Q11 is connected with the second communication interface through the resistance R38, and the emitter is grounded.

10. The battery communication circuit of claim 9, wherein, The second receiving circuit comprises a transistor Q12, a transistor Q13, a resistance R39, a resistance R40, a resistance R41, a resistance R42, a resistance R43, a resistance R44, a resistance R45 and a resistance R46; wherein the base of the transistor Q12 is connected with the second communication interface through the resistance R39, the collector is connected with the base of the transistor Q13 and the resistance R42 through the resistance R41, and the emitter is grounded; the emitter of the transistor Q13 is connected with the third power supply interface for power supply, the collector is connected with the resistance R45 and the resistance R46, the other end of the resistance R45 is connected with the second RX interface; the other end of the resistance R46 and the other end of the resistance R43 are both grounded; the other end of the resistance R42 is connected with the third power supply interface for power supply.

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