Electric bicycle charging power supply on-off protection circuit and protector

Abstract

The utility model discloses an electric bicycle charging power supply on-off protection circuit and protector, comprising a charging protection circuit module which is used for protecting the charging overvoltage of an electric bicycle by detecting the charging port plug and the charging voltage of the electric bicycle. According to the utility model, the charging protection circuit module is arranged, the charging port detection circuit of the charging protection circuit module can detect whether a power supply is inserted into the charging port, the overvoltage protection detection circuit can detect whether the charging voltage is overvoltage, and the charging port protection circuit can timely disconnect a charging circuit. The over-voltage condition in the charging process of the electric bicycle can be protected, and safe charging of the electric bicycle is guaranteed.

Description

Technical Field

[0001] This utility model relates to the field of power supply on / off protection technology for electric bicycle charging, and in particular to a power supply on / off protection circuit and protector for electric bicycle charging. Background Technology

[0002] In recent years, fires caused by electric bicycles have occurred frequently, especially due to violations such as charging vehicles indoors, which greatly increases the risk of fire. It is understood that electric bicycle batteries can explode spontaneously during use, charging, and even when stationary. Lithium batteries are a key component of electric bicycles, but they pose significant safety hazards; short circuits, overcharging, over-discharging, and high temperatures can all cause battery fires.

[0003] Patent document CN108134420A discloses an electric bicycle charger monitoring system, which can automatically control whether the electric bicycle charger is charging and can directly disconnect the power supply to the electric bicycle charger and the charging battery. However, it also has the following drawbacks: 1. The protection circuit structure is not disclosed; 2. It cannot effectively detect the plug of the electric bicycle charging port. Utility Model Content

[0004] The purpose of this utility model is to provide a power supply on / off protection circuit and protector for electric bicycles, which solves the problem of circuit protection in cases of overcharging and high temperature in electric bicycles.

[0005] The objective of this utility model can be achieved through the following technical solutions:

[0006] First aspect: A power supply continuity protection circuit for electric bicycle charging, comprising:

[0007] The charging protection circuit module includes a charging port protection circuit, a charging port detection circuit, and an overvoltage protection detection circuit. It detects the charging port plug and charging voltage of the electric bicycle and protects against overvoltage during charging.

[0008] As a further embodiment of this utility model, the charging port detection circuit includes a diode D4, one end of which is connected to the P-in port, the other end of which is connected to one end of R23 and one end of R24, the other end of which is connected to a 5V power supply, the other end of which is connected to one end of C7 and the P-in detection port, and the other end of which is grounded.

[0009] As a further embodiment of this invention, the overvoltage protection detection circuit includes a comparator U2A:

[0010] The 3rd port of comparator U2A is connected to one end of R36, the other end of R36 is connected to one end of C9, R40 and R31, the other end of C9 and R40 is grounded, and the other end of R31 is connected to the B+ acquisition port.

[0011] The second port of comparator U2A is connected to one end of R42 and R33. The other end of R42 is grounded, and one end of R33 is connected to a 5V power supply.

[0012] The 1 port of comparator U2A is connected to the V Bus acquisition port.

[0013] As a further embodiment of this invention, the charging port protection circuit includes a MOSFET M1:

[0014] M1's port 1 connects to one end of C3, R8, and R5. The other end of C3 and R8 is grounded. The other end of R5 is connected to Q2's port C. Q2's port E is connected to the B+ acquisition port. Q2's port B is connected to Q3's port C and one end of R3. The other end of R3 is connected to Q2's port E. Q3's port E is grounded. Q3's port B is connected to one end of R7 and R4. The other end of R7 is grounded. The other end of R4 is connected to the p1-out port. M1's port 3 is connected to P-.

[0015] As a further improvement of this invention, the charging port protection circuit also includes a MOSFET M2:

[0016] M2's port 1 is connected to one end of C6, R20, and R16. The other end of C6 and R20 is grounded. The other end of R16 is connected to Q6's port C. Q6's port E is connected to the B+ acquisition port. Q6's port B is connected to Q7's port C and one end of R3. The other end of R3 is connected to Q6's port E. Q7's port E is grounded. Q7's port B is connected to one end of R19 and R15. The other end of R19 is grounded. The other end of R15 is connected to the p2-out port.

[0017] Among them, port 2 of M1 is connected to port 2 of M2, port 3 of M2 is grounded, and R11 is connected between port p1-out and port p2-out.

[0018] The second aspect: an electric bicycle power supply continuity protector, which adopts the electric bicycle power supply continuity protection circuit described in the first aspect, wherein the protector detects the electric bicycle charging port plug and charging voltage, and protects against overvoltage during electric bicycle charging.

[0019] The beneficial effects of this utility model are:

[0020] This utility model incorporates a charging protection circuit module. The charging port detection circuit of the module can detect whether the charging port plug is inserted into the power supply, the overvoltage protection detection circuit can detect whether the charging voltage is too high, and the charging port protection circuit can disconnect the charging line in time. This can protect against overvoltage during the charging process of electric bicycles and ensure the safe charging of electric bicycles. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the charging protection circuit module of this utility model;

[0022] Figure 2 This is a schematic diagram of the charging port detection circuit of this utility model;

[0023] Figure 3 This is a schematic diagram of the overvoltage protection detection circuit of this utility model;

[0024] Figure 4 This is a schematic diagram of the charging port protection circuit of this utility model. Detailed Implementation

[0025] The embodiments of this utility model are described in detail below. Examples of these embodiments are illustrated in the accompanying drawings, wherein the same or similar symbols denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0026] like Figure 1-4 As shown, this utility model discloses a power supply on / off protection circuit for electric bicycles, comprising:

[0027] The charging protection circuit module detects the charging port plug and charging voltage of the electric bicycle and protects against overvoltage during charging.

[0028] like Figure 1 As shown, the charging protection circuit module includes a charging port protection circuit, a charging port detection circuit, and an overvoltage protection detection circuit.

[0029] The charging port detection circuit structure is as follows: Figure 2 As shown, the circuit includes diode D4. One end of diode D4 is connected to the PI port, and the other end of diode D4 is connected to one end of R23 and one end of R24. The other end of R23 is connected to a 5V power supply, and the other end of R24 is connected to one end of C7 and the p-in detection port. The other end of C7 is grounded.

[0030] When the charging port detection circuit detects that the charger is plugged into the socket, it pulls down the power supply voltage and sends a signal to the MCU module (not shown in the figure) through the p-in detection port. The MCU module then determines the charging port connection status to the socket.

[0031] The overvoltage protection detection circuit structure is as follows: Figure 3 As shown, it includes comparator U2A:

[0032] The third port of comparator U2A is connected to one end of R36, and the other end of R36 is connected to one end of C9, R40 and R31. The other ends of C9 and R40 are grounded, and the other end of R31 is connected to the B+ acquisition port. The second port of comparator U2A is connected to one end of R42 and R33. The other end of R42 is grounded, and one end of R33 is connected to the 5V power supply. The first port of comparator U2A is connected to the V Bus acquisition port.

[0033] The overvoltage protection detection circuit acquires the charging voltage B+ and compares and calculates it using comparator U2A. When it exceeds the rated value, such as exceeding 77V, it determines that the charging is overvoltage. The 1 port of comparator U2A sends a signal to the V Bus acquisition port, which in turn sends a signal to the MCU module. The MCU module controls the charging protection circuit to disconnect the charging process, thus realizing overvoltage protection during the charging process.

[0034] The structure of the charging port protection circuit is as follows: Figure 4 As shown, the MOSFET M1 is included: M1's port 1 is connected to one end of C3, R8, and R5, the other end of C3 and R8 is grounded, the other end of R5 is connected to Q2's port C, Q2's port E is connected to the B+ acquisition port, Q2's port B is connected to Q3's port C and one end of R3, the other end of R3 is connected to Q2's port E, Q3's port E is grounded, Q3's port B is connected to one end of R7 and R4, the other end of R7 is grounded, the other end of R4 is connected to the P1-out port, and M1's port 3 is connected to P-.

[0035] When the electric bicycle is charging normally, M1 is turned on. When the P-port receives an overvoltage signal from the MCU module, M1 is turned off, and the electric bicycle stops charging, thus providing overvoltage protection.

[0036] Furthermore, such as Figure 4 As shown, the charging port protection circuit also includes MOSFET M2: M2's port 1 is connected to one end of C6, R20, and R16, the other end of C6 and R20 is grounded, the other end of R16 is connected to port C of Q6, port E of Q6 is connected to the B+ acquisition port, port B of Q6 is connected to port C of Q7 and one end of R3, the other end of R3 is connected to port E of Q6, port E of Q7 is grounded, port B of Q7 is connected to one end of R19 and R15, the other end of R19 is grounded, and the other end of R15 is connected to the P2-out port.

[0037] Among them, port 2 of M1 is connected to port 2 of M2, port 3 of M2 is grounded, and R11 is connected between port p1-out and port p2-out.

[0038] By connecting M1 and M2 in parallel, the charging process of electric bicycles can be ensured to proceed normally, and overvoltage during charging can be dealt with in a timely manner.

[0039] This utility model also discloses an electric bicycle charging power supply continuity protector. The protector adopts the circuit structure of this application, detects the electric bicycle charging port plug and charging voltage, and protects against overvoltage during electric bicycle charging.

[0040] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and concept of the present utility model, should be included within the protection scope of the present utility model.

[0041] It should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0042] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0043] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0044] In this utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

Claims

1. A power supply on-off protection circuit for an electric bicycle, characterized in that, It includes: The charging protection circuit module includes charging port protection circuit, charging port detection circuit and overvoltage protection detection circuit, detects electric bicycle charging port plug and charging voltage, and protects electric bicycle charging overvoltage.

2. A power supply on-off protection circuit for an electric bicycle as claimed in claim 1, characterized in that, The charging port detection circuit includes diode D4, one end of diode D4 is connected with P-I port, the other end of diode D4 is connected with one end of R23 and one end of R24, the other end of R23 is connected with 5V power supply, the other end of R24 is connected with one end of C7 and p-in detection port, and the other end of C7 is grounded.

3. The on-off protection circuit for charging power supply of electric bicycle according to claim 1, characterized in that, The overvoltage protection detection circuit includes comparator U2A: 3 port of comparator U2A is connected with one end of R36, the other end of R36 is connected with C9, R40 and one end of R31, the other end of C9 and R40 is grounded, and the other end of R31 is connected with B+ acquisition port; 2 port of comparator U2A is connected with R42 and one end of R33, the other end of R42 is grounded, and one end of R33 is connected with 5V power supply; 1 port of comparator U2A is connected with V Bus acquisition port.

4. The on-off protection circuit for charging power supply of electric bicycle according to claim 1, characterized in that, The charging port protection circuit includes mos tube M1: 1 port of M1 is connected with C3, R8 and one end of R5, the other end of C3 and R8 is grounded, the other end of R5 is connected with C port of Q2, E port of Q2 is connected with B+ acquisition port, B port of Q2 is connected with C port of Q3 and one end of R3, the other end of R3 is connected with E port of Q2, E port of Q3 is grounded, B port of Q3 is connected with one end of R7 and R4, the other end of R7 is grounded, the other end of R4 is connected with p1-out port, and 3 port of M1 is connected with P-.

5. A power supply on-off protection circuit for an electric bicycle as defined in claim 4, wherein The charging port protection circuit further includes mos tube M2: 1 port of M2 is connected with C6, R20 and one end of R16, the other end of C6 and R20 is grounded, the other end of R16 is connected with C port of Q6, E port of Q6 is connected with B+ acquisition port, B port of Q6 is connected with C port of Q7 and one end of R3, the other end of R3 is connected with E port of Q6, E port of Q7 is grounded, B port of Q7 is connected with one end of R19 and R15, the other end of R19 is grounded, and the other end of R15 is connected with p2-out port; Wherein, 2 port of M1 is connected with 2 port of M2, 3 port of M2 is grounded, and R11 is connected between p1-out port and p2-out port.

6. An electric bicycle charging power supply on-off protector, characterized in that, The electric bicycle charging power supply on-off protection circuit of any one of claims 1-5 is applied, the protector detects electric bicycle charging port plug and charging voltage, and protects electric bicycle charging overvoltage.

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