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

Abstract

The utility model discloses an electric bicycle operation power supply on-off protection circuit and a protector, a mos tube is connected between an electric bicycle positive pole power supply BAT + and an output load power supply BAT-OUT, the mos tube is controlled by the on-off protection circuit, and the on-off protection of the electric bicycle operation power supply is realized. Whether current overload exists in battery output of the electric bicycle or not is judged through the protection circuit. When current overload or short circuit exists, battery output of the electric bicycle can be cut off in a soft or hard mode, and therefore unforeseen circumstances caused by current overload or short circuit are prevented.

Description

TECHNICAL FIELD

[0001] The utility model relates to electric bicycle power on-off protection technical field especially, a kind of electric bicycle operating power on-off protection circuit and protector. BACKGROUND

[0002] In recent years, fire accidents caused by electric bicycles occur frequently, when electric vehicle battery is used, there may be excessive load, short circuit and other conditions, causing electric bicycle fire and other accidents, which poses a great safety hazard.

[0003] The patent document with document number CN108134420A discloses an electric bicycle charger monitoring system, which can automatically control whether the electric vehicle charger is charging, and can directly disconnect the power supply of the electric vehicle charger and the charging battery. However, it also has the following problems: 1. The protection circuit structure is not disclosed; 2. It cannot protect against overcurrent or short circuit current of the electric bicycle. UTILITY MODEL CONTENT

[0004] The utility model aims to provide an electric bicycle operating power on-off protection circuit and protector, which protects against overcurrent or short circuit current of the electric bicycle and improves the safety of electric bicycle operation.

[0005] The utility model can achieve the purpose by the following technical scheme: an electric bicycle operating power on-off protection circuit, a mos tube is connected between the positive power supply BAT+ of the electric bicycle and the output load power supply BAT-OUT, and the on-off protection circuit comprises:

[0006] A monitoring circuit module monitors the output current during operation of the electric bicycle and obtains a monitoring voltage value.

[0007] A comparison circuit module compares the obtained monitoring current voltage difference and outputs a comparison value.

[0008] A hard protection circuit module controls the mos tube according to the comparison value and performs short circuit hard protection on the operating power supply of the electric bicycle.

[0009] A soft protection circuit module controls the mos tube according to the comparison value and performs overload soft protection on the operating power supply of the electric bicycle.

[0010] Optionally, a voltage dividing circuit module is further connected between the monitoring circuit module and the comparison circuit module, and the voltage of the monitoring circuit module enters the comparison circuit module after being divided by the voltage dividing circuit module.

[0011] Optionally, the monitoring circuit module comprises R41 and R38, which are connected in parallel between the positive power supply BAT+ of the electric vehicle and the output load power supply BAT-OUT, and monitor the output current of the electric bicycle.

[0012] Optionally, the voltage dividing circuit module comprises R32 and R37, wherein

[0013] One end of R32 is connected to one end of R41 and one end of R38, the other end of R32 is connected to one end of R44 and one end of R49, the other end of R44 is connected to ground, the other end of R49 is connected to one end of R48 and 5th port of comparator U2B, the other end of R48 is connected to ground;

[0014] One end of R37 is connected to the other end of R41 and the other end of R38, the other end of R37 is connected to one end of R39 and one end of R50, the other end of R39 is connected to ground, the other end of R50 is connected to one end of R43 and 6th port of comparator U2B.

[0015] Optionally, the comparison circuit module comprises comparator U2B, wherein

[0016] 5th port of U2B is connected to R49, 6th port of U2B is connected to R50, 4th port of U2B is connected to ground, 4th port of U2B is connected to 5V power supply, U2B obtains the change of output voltage of the electric bicycle through 5th port and 6th port, R43 is connected between 7th port of U2B and 6th port of U2B, 7th port of U2B outputs comparison voltage.

[0017] Optionally, the hard protection circuit module comprises transistor Q12, wherein E port of Q12 is connected to one end of R47 and ground, B port of Q12 is connected to the other end of R47 and one end of R30, the other end of R30 is connected to 7th port of U2B, C port of Q12 is connected to one end of R28, the other end of R28 is connected to 5V power supply.

[0018] Optionally, the soft protection circuit module comprises transistors Q10 and Q9, wherein

[0019] B port of Q10 is connected to C port of Q12, E port of Q10 is connected to one end of R35, the other end of R35 is connected to vcc open port, C port of Q10 is connected to one end of R25 and B port of Q9, the other end of R25 is connected to BAT-UP and E port of Q9;

[0020] C port of Q9 is connected to a mos tube, and the gate of the mos tube is controlled.

[0021] Optionally, the soft protection circuit module comprises two mos tubes, the two mos tubes are connected in parallel between the positive electrode power supply BAT+ of the electric bicycle and the output load power supply BAT-OUT, and a bleeder circuit module is connected between the soft protection circuit module and the two mos tubes.

[0022] Optionally, the bleeder circuit module comprises Q11, wherein

[0023] B port of Q11 is connected to C port of Q9, one end of D5 and one end of R29, the other end of D5 is connected to one end of R27;

[0024] The E port of Q11 is connected to the other end of R27 and the gate ports of M5 and M3;

[0025] The C port of Q11 is connected to the other end of R29 and the other end of C8, R46 and D6 and one end of D8, and the other end of D8 is connected to the source ports of M5 and M3 and one end of R38.

[0026] An electric bicycle power on-off protector, the protector monitors the current in the operation of the electric bicycle, and protects the current.

[0027] The electric bicycle power on-off protector has the advantages that:

[0028] 1. The protection circuit is used for judging whether the current overload exists in the battery output of the electric bicycle.

[0029] 2. The soft protection circuit module and the hard protection circuit module are arranged, the short circuit current and the overload current of the electric bicycle can be distinguished and processed respectively, the overload current can be turned off softly, the turn-off time of the overload current can be controlled, the power supply is prevented from being turned off by mistake, and the normal use of the electric bicycle is ensured. BRIEF DESCRIPTION OF DRAWINGS

[0030] Figure 1 It is a structure schematic view of the power on-off protection circuit of the utility model in operation;

[0031] Figure 2 It is a structure schematic view of the monitoring circuit module of the utility model;

[0032] Figure 3 It is a structure schematic view of the comparison circuit module and the voltage division circuit module of the utility model;

[0033] Figure 4 It is a structure schematic view of the hard protection circuit module of the utility model;

[0034] Figure 5 It is a structure schematic view of the soft protection circuit module of the utility model;

[0035] Figure 6 It is a structure schematic view of the bleeding circuit module of the utility model. DETAILED DESCRIPTION

[0036] Embodiments of the present application will be described in detail below, examples of the embodiments are represented in the drawings, wherein the same or similar symbols represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by reference to the drawings are exemplary and are only used to explain the present application and cannot be understood as limiting the present application.

[0037] As shown in Figures 1-6 The utility model discloses an electric bicycle running power supply on-off protection circuit, and the electric bicycle positive power supply BAT+ and output load power supply BAT-OUT are connected with the mos pipe, and the mos pipe is connected with the on-off protection circuit, and the on-off protection circuit controls the mos pipe, realizes the on-off protection of electric bicycle running power supply.

[0038] The on-off protection circuit mainly includes: monitoring circuit module, comparison circuit module, hard protection circuit module and soft protection circuit module.

[0039] As shown in Figure 1 The on-off protection circuit monitors the output current in the running of the electric bicycle through the monitoring circuit module, compares the monitored current voltage difference through the comparison circuit module and outputs the comparison value, the hard protection circuit module controls the mos pipe according to the comparison value and performs short-circuit hard protection on the running power supply of the electric bicycle, and the soft protection circuit module controls the mos pipe according to the comparison value and performs overload soft protection on the running power supply of the electric bicycle.

[0040] Specifically, the structure of the monitoring circuit module is as shown in Figure 2 The monitoring circuit module includes R41 and R38, and R41 and R38 are connected in parallel between the positive power supply BAT+ of the electric vehicle and the output load power supply BAT-OUT, and the output current of the electric bicycle is monitored. The parallel connection of R41 and R38 can accurately collect the output current change and provide accurate and reliable current collection data.

[0041] Specifically, the structure of the comparison circuit module is as shown in Figure 3 The comparison circuit module includes comparator U2B, the 5th port of U2B is connected with R49, the 6th port of U2B is connected with R50, the 4th port of U2B is grounded, the 8th port of U2B is connected with 5V power supply, U2B obtains the voltage difference of the output voltage of the electric bicycle through the 5th port and the 6th port, R43 is connected between the 7th port and the 6th port of U2B, and the comparator U2B differentiates and compares according to the voltage difference of the collected current and outputs the differentiated comparison voltage value through the 7th port.

[0042] Further, a voltage dividing circuit module is connected between the monitoring circuit module and the comparison circuit module, and the voltage of the monitoring circuit module enters the comparison circuit module after being divided by the voltage dividing circuit module.

[0043] As shown in Figure 3As shown, the voltage divider circuit module includes R32 and R37.

[0044] In this configuration, one end of R32 is connected to one end of R41 and R38, and the other end of R32 is connected to one end of R44 and R49. The other end of R44 is grounded, and the other end of R49 is connected to one end of R48 and port 5 of comparator U2B. The other end of R48 is grounded. One end of R37 is connected to one end of R41 and R38, and the other end of R37 is connected to one end of R39 and R50. The other end of R39 is grounded, and the other end of R50 is connected to one end of R43 and port 6 of comparator U2B.

[0045] The monitoring circuit module is connected to the positive voltage of the electric bicycle, which is often high, reaching over 40V. If the positive voltage is directly connected to the comparator U2B, it can easily damage the comparator U2B. Therefore, connecting a voltage divider circuit module between the monitoring circuit module and the comparator circuit module can protect the comparator circuit module.

[0046] The 7-port output differential comparison voltage value of the U2B can directly reflect whether the electric bicycle has overload current or short circuit current.

[0047] Overload current protection for electric bicycles can be implemented using a soft protection circuit module. The specific structure of this soft protection circuit module is as follows: Figure 5 As shown, the soft protection circuit module includes transistors Q10 and Q9.

[0048] Specifically, the B port of Q10 is connected to the C port of Q12, the E port of Q10 is connected to one end of R35, the other end of R35 is connected to the VCC open port, the C port of Q10 is connected to one end of R25 and the B port of Q9, the other end of R25 is connected to BAT-UP and the E port of Q9; the C port of Q9 is connected to the MOSFET to control the gate of the MOSFET.

[0049] When there is an overload current in the output power supply of the electric bicycle, the differential comparison voltage value output by port 7 of U2B is sent to port IV of the MCU controller (not shown in the figure). Based on the voltage difference value obtained from port IV, the MCU controller can output a VCC Open signal after a delay (e.g., a delay of 2 seconds) to control transistor Q10 to turn off, and then Q9 to turn off. By using the gate of the MOSFET to disconnect the drain and source of the MOSFET, the positive power supply BAT+ of the electric bicycle is disconnected from the output load power supply BAT-OUT, thus playing a protective role in disconnecting the power supply.

[0050] Short-circuit current protection for electric bicycles can be implemented using a hardware protection circuit module. Specifically, the structure of the hardware protection circuit module is as follows: Figure 4 As shown, the hard protection circuit module includes transistor Q12.

[0051] In this configuration, the E port of Q12 is connected to one end of R47 and grounded, the B port of Q12 is connected to the other end of R47 and one end of R30, the other end of R30 is connected to port 7 of U2B, the C port of Q12 is connected to one end of R28, and the other end of R28 is connected to a 5V power supply.

[0052] When a short-circuit current exists in the output power supply of the electric bicycle, the differential comparison voltage value output by port 7 of U2B will increase significantly (for example, the differential voltage output by port 7 is 2V when there is an overload current, but it will reach more than 3V when there is a short-circuit current). When the differential comparison voltage value increases significantly, it is determined that the electric bicycle power supply is in a short-circuit state and needs to be cut off urgently. When port B of Q12 obtains a large differential voltage output by port 7 of U2B, Q12 is turned off, which in turn causes Q10 and Q9 to turn off. This, in turn, disconnects the drain and source of the MOSFET using the gate of the MOSFET, thereby disconnecting the positive power supply BAT+ of the electric bicycle from the output load power supply BAT-OUT, thus providing a protective disconnection of the power supply without delay protection through the MCU controller.

[0053] Furthermore, such as Figure 6 As shown, two MOSFETs are used, and the two MOSFETs are connected in parallel between the positive power supply BAT+ of the electric bicycle and the output load power supply BAT-OUT. A discharge circuit module is connected between the soft protection circuit module and the two MOSFETs.

[0054] The structure of the bleeder circuit module is as follows: Figure 6 As shown, this includes Q11.

[0055] Specifically, the B port of Q11 is connected to the C port of Q9 and one end of D5 and R29, and the other end of D5 is connected to one end of R27; the E port of Q11 is connected to the other end of R27 and to one end of C8, R46, D6 and the gate ports of M5 and M3; the C port of Q11 is connected to the other end of R29 and to the other end of C8, R46, D6 and one end of D8, and the other end of D8 is connected to the source ports of MOSFETs M5 and M3 and to one end of R38.

[0056] By utilizing the bleeder circuit module, the gate voltage of the MOSFETs can be quickly discharged when the two MOSFETs are turned off, thereby protecting the MOSFETs.

[0057] Furthermore, this application also discloses an electric bicycle power supply protection device, which monitors the current during the operation of the electric bicycle and protects against the current.

[0058] 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.

[0059] 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.

[0060] 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.

[0061] 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.

[0062] 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 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. An electric bicycle running power supply on-off protection circuit, characterized in that, The electric bicycle positive power supply BAT+ and the output load power supply BAT-OUT are connected with a MOS tube, and the on-off protection circuit comprises: a monitoring circuit module for monitoring the output current of the electric bicycle in operation and obtaining a monitoring voltage value; a comparison circuit module for comparing the obtained monitoring current voltage difference value and outputting a comparison value; a hard protection circuit module for controlling the MOS tube according to the comparison value and performing short-circuit hard protection on the power supply of the electric bicycle in operation; a soft protection circuit module for controlling the MOS tube according to the comparison value and performing overload soft protection on the power supply of the electric bicycle in operation.

2. A power supply on-off protection circuit for an electric bicycle according to claim 1, wherein The monitoring circuit module and the comparison circuit module are further connected with a voltage dividing circuit module, and the voltage of the monitoring circuit module enters the comparison circuit module after being divided by the voltage dividing circuit module.

3. A power supply on-off protection circuit for an electric bicycle according to claim 2, wherein The monitoring circuit module comprises R41 and R38, which are connected in parallel between the positive power supply BAT+ of the electric bicycle and the output load power supply BAT-OUT and monitor the output current of the electric bicycle.

4. A power supply on-off protection circuit for an electric bicycle according to claim 3, wherein The voltage dividing circuit module comprises R32 and R37, wherein one end of R32 is connected with one end of R41 and R38, the other end of R32 is connected with one end of R44 and R49, the other end of R44 is connected with the ground, the other end of R49 is connected with one end of R48 and the 5th port of the comparator U2B, and the other end of R48 is connected with the ground; one end of R37 is connected with the other end of R41 and R38, the other end of R37 is connected with one end of R39 and R50, the other end of R39 is connected with the ground, and the other end of R50 is connected with one end of R43 and the 6th port of the comparator U2B.

5. A run-time power on-off protection circuit for an electric bicycle as claimed in claim 4, wherein, The comparison circuit module comprises the comparator U2B, wherein the 5th port of U2B is connected with R49, the 6th port of U2B is connected with R50, the 4th port of U2B is connected with the ground, the 4th port of U2B is connected with a 5V power supply, U2B obtains the change of the output voltage of the electric bicycle through the 5th port and the 6th port, R43 is connected between the 7th port and the 6th port of U2B, and the 7th port of U2B outputs a comparison voltage.

6. A run-time power on-off protection circuit for an electric bicycle as defined in claim 5, wherein, The hard protection circuit module comprises a triode Q12, wherein the E port of Q12 is connected with one end of R47 and the ground, the B port of Q12 is connected with the other end of R47 and one end of R30, the other end of R30 is connected with the 7th port of U2B, the C port of Q12 is connected with one end of R28, and the other end of R28 is connected with a 5V power supply.

7. A run-time power on-off protection circuit for an electric bicycle as defined in claim 6, wherein The soft protection circuit module comprises triodes Q10 and Q9, wherein the B port of Q10 is connected with the C port of Q12, the E port of Q10 is connected with one end of R35, the other end of R35 is connected with the vcc open port, the C port of Q10 is connected with one end of R25 and the B port of Q9, the other end of R25 is connected with BAT-UP and the E port of Q9, and the C port of Q9 is connected with the MOS tube to control the gate of the MOS tube.

8. A run-time power on-off protection circuit for an electric bicycle according to claim 7, wherein, The MOS tube is two, and the two MOS tubes are connected in parallel between the positive power supply BAT+ of the electric bicycle and the output load power supply BAT-OUT, and the soft protection circuit module is connected with the two MOS tubes and has a bleeder circuit module.

9. A run-time power on-off protection circuit for an electric bicycle as defined in claim 8, wherein, The bleeder circuit module comprises Q11, wherein the B port of Q11 is connected with the C port of Q9, one end of R29 and D5, and the other end of D5 is connected with one end of R27; the E port of Q11 is connected with the other end of R27 and the one end of C8, R46, D6, and the gate port of M5 and M3. The other end of C8 is connected to the other end of R46, the other end of D6 and one end of D8, the other end of D8 is connected to the source of mos M5 and M3 and the other end of R38.

10. An electric bicycle running power supply on-off protector, characterized in that, The application relates to an electric bicycle operation power supply on-off protection circuit, wherein the protector monitors the current in the electric bicycle operation state and protects the current.

Images