Motorcycle starting power supply protection circuit and motorcycle starting power supply

Abstract

The invention provides a motorcycle starting power supply protection circuit and a motorcycle starting power supply. The motorcycle starting power supply protection circuit comprises a starting power supply module, an LDO (Low Dropout Regulator) module and an operational amplifier module, the starting power supply module comprises a power supply controller and a starting activation circuit; the operational amplifier module comprises a first operational amplifier and a second operational amplifier, the output end of the first operational amplifier is connected with the first low-power-consumption detection end of the power supply controller, and the output end of the second operational amplifier is connected with the second low-power-consumption detection end of the power supply controller. And when the two are equal, the voltage between the negative electrode of the starting power supply and the power utilization negative end is the same, the starting power supply is in a current-free output state, that is, the non-discharge time is too long, and the power supply controller is closed to reduce the power consumption. And when the starting power supply is under-voltage, the LDO module is closed through the discharge driving signal, so that the power consumption is further reduced.

Description

Technical Field

[0001] This disclosure relates to the field of starting power supply technology, and in particular to a motorcycle starting power supply protection circuit and a motorcycle starting power supply. Background Technology

[0002] Various vehicles have become essential daily modes of transportation, such as cars, buses, and motorcycles for carrying passengers, and trucks for transporting goods. These vehicles all rely on starting power supplies to power their engines. Motorcycle starting power supplies are used in various scenarios: some are installed on motorcycles for long-term storage without use, while others are stored and ready for immediate use. To meet both needs, especially with small-capacity batteries, the Battery Management System (BMS) must provide continuous output with minimal power consumption.

[0003] However, BMS solutions with FAE and MCU on the market do not require deep sleep mode for extended periods. Instead, they typically shut down the MOS after a period of time and then activate it through communication, charging, or button presses, or they continue to output power. This results in excessive power consumption and makes it difficult to store small batteries for long periods. Summary of the Invention

[0004] The purpose of this disclosure is to overcome the shortcomings of the prior art and provide a motorcycle starting power protection circuit and a motorcycle starting power supply that have low power consumption and are easy to store for a long time.

[0005] The purpose of this disclosure is achieved through the following technical solution: A motorcycle starting power supply protection circuit includes: a starting power supply module, an LDO module, and an operational amplifier module; the starting power supply module includes a power controller and a starting activation circuit, the input terminal of the starting activation circuit is used to receive an activation signal, and the output terminal of the starting activation circuit is connected to the activation terminal of the power controller; the input terminal of the LDO module is used to connect to the positive terminal of the starting power supply, and the control terminal of the LDO module is used to receive a discharge drive signal to shut down the LDO module when the voltage of the starting power supply is lower than a preset undervoltage; the operational amplifier module includes a first operational amplifier and a second operational amplifier, the positive input terminal of the first operational amplifier and the negative input terminal of the second operational amplifier are both connected to the negative terminal of the starting power supply, and the negative input terminal of the first operational amplifier and the positive input terminal of the second operational amplifier are both connected to the negative terminal of the power supply; the output terminal of the first operational amplifier is connected to the first low-power detection terminal of the power controller, and the output terminal of the second operational amplifier is connected to the second low-power detection terminal of the power controller, so that the power controller is shut down when the voltage of the first low-power detection terminal is equal to the voltage of the second low-power detection terminal for a period of time longer than a preset time.

[0006] In one embodiment, the operational amplifier module further includes a first resistor, a second resistor, and a third resistor. The first end of the first resistor is connected to the negative terminal of the power supply, the second end of the first resistor is connected to the positive input terminal of the first operational amplifier, and the second end of the first resistor is also grounded through the second resistor. The first end of the third resistor is connected to the negative terminal of the power supply, and the second end of the third resistor is connected to the negative input terminal of the first operational amplifier.

[0007] In one embodiment, the operational amplifier module further includes a fourth resistor, a fifth resistor, and a sixth resistor. The first end of the fourth resistor is connected to the negative terminal of the power supply, and the second end of the fourth resistor is connected to the positive input terminal of the second operational amplifier. The second end of the fourth resistor is also grounded through the fifth resistor. The first end of the sixth resistor is connected to the negative terminal of the power supply, and the second end of the sixth resistor is connected to the negative input terminal of the second operational amplifier.

[0008] In one embodiment, the operational amplifier module further includes a third operational amplifier, a seventh resistor, and an eighth resistor. The output terminal of the first operational amplifier is connected to the positive input terminal of the third operational amplifier. The first terminal of the seventh resistor is connected to the negative input terminal of the third operational amplifier. The second terminal of the seventh resistor is grounded. The first terminal of the seventh resistor is also connected to the output terminal of the third operational amplifier through the eighth resistor. The output terminal of the third operational amplifier is connected to the first low-power detection terminal.

[0009] In one embodiment, the activation circuit includes a charging optocoupler, a ninth resistor, and a first activation diode. The first end of the ninth resistor is connected to the charging positive terminal, the second end of the ninth resistor is connected to the light-emitting positive terminal of the charging optocoupler, the light-emitting negative terminal of the charging optocoupler is grounded, the light-receiving negative terminal of the charging optocoupler is grounded, the light-receiving positive terminal of the charging optocoupler is connected to the positive terminal of the first activation diode, and the negative terminal of the first activation diode is connected to the activation terminal of the power controller.

[0010] In one embodiment, the startup activation circuit includes a tenth resistor and a second activation diode. The first end of the tenth resistor is connected to the activation terminal of the power controller, the second end of the tenth resistor is connected to the positive terminal of the second activation diode, and the negative terminal of the second activation diode is connected to the negative terminal of the first activation diode.

[0011] In one embodiment, the activation circuit includes an activation button switch, one end of which is connected to the activation terminal of the power controller, and the other end of which is grounded.

[0012] In one embodiment, the startup activation circuit includes a first electronic switch, a second electronic switch, and an eleventh resistor. A first terminal of the eleventh resistor is connected to a reference power supply. A second terminal of the eleventh resistor is connected to a first terminal of the first electronic switch. The control terminal of the first electronic switch is connected to the output terminal of the first operational amplifier, and the second terminal of the first electronic switch is grounded. The second terminal of the eleventh resistor is also connected to a first terminal of the second electronic switch. The control terminal of the second electronic switch is connected to the output terminal of the second operational amplifier, and the second terminal of the second electronic switch is grounded. Furthermore, the second terminal of the eleventh resistor is also connected to the activation terminal of the power controller.

[0013] In one embodiment, the LDO module includes an LDO voltage drop transformer, a third electronic switch, a fourth electronic switch, and a twelfth resistor. The first terminal of the third electronic switch is connected to the positive terminal of the startup power supply, and the second terminal of the third electronic switch is connected to the input terminal of the LDO voltage drop transformer. The first terminal of the third electronic switch is also connected to the control terminal of the third electronic switch through the twelfth resistor. The control terminal of the third electronic switch is connected to the first terminal of the fourth electronic switch, and the second terminal of the fourth electronic switch is grounded. The second terminal of the fourth electronic switch receives a discharge drive signal.

[0014] A motorcycle starting power supply includes the motorcycle starting power supply protection circuit described in any of the above embodiments.

[0015] Compared with the prior art, this disclosure has at least the following advantages: The voltage at the first low-power detection terminal is used to detect the voltage change between the negative terminal of the startup power supply and the negative terminal of the user power supply. The voltage at the second low-power detection terminal is used to detect the voltage change between the negative terminal of the startup power supply and the negative terminal of the user power supply. When the two are equal, the voltage between the negative terminal of the startup power supply and the negative terminal of the user power supply is the same. At this time, the startup power supply is in a state of no current output, i.e., the non-discharge time is too long, and the power controller is turned off to reduce power consumption. When the startup power supply is undervoltage, the LDO module is turned off through the discharge drive signal to further reduce power consumption. Attached Figure Description

[0016] To more clearly illustrate the technical solutions of the embodiments of this disclosure, the accompanying drawings used in the embodiments will be briefly described below. It should be understood that the following drawings only show some embodiments of this disclosure and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a circuit diagram of a motorcycle starting power protection circuit in one embodiment; Figure 2 for Figure 1 The circuit diagram shown is of the starting power module in the motorcycle starting power protection circuit. Figure 3 for Figure 1 The circuit diagram shown is of the operational amplifier module in the motorcycle starting power protection circuit. Figure 4 for Figure 1 The circuit diagram shown is of the LDO module in the motorcycle starting power protection circuit. Figure 5 This is a circuit diagram of an overcurrent protection detection module in one embodiment; Figure 6 This is a circuit diagram of an overcurrent protection detection module in another embodiment. Detailed Implementation

[0018] To facilitate understanding of this disclosure, a more complete description will be given below with reference to the accompanying drawings, which illustrate preferred embodiments of the present disclosure. However, this disclosure can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a more thorough and complete understanding of the disclosure.

[0019] It should be noted that when an element is referred to as being "fixed to" another element, it can be directly attached to the other element or there may be an intervening element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0020] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of this disclosure. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0021] This disclosure relates to a motorcycle starting power supply protection circuit. In one embodiment, the motorcycle starting power supply protection circuit includes a starting power supply module, an LDO module, and an operational amplifier module; the starting power supply module includes a power controller and a starting activation circuit, the input terminal of the starting activation circuit is used to receive an activation signal, and the output terminal of the starting activation circuit is connected to the activation terminal of the power controller; the input terminal of the LDO module is used to connect to the positive terminal of the starting power supply, and the control terminal of the LDO module is used to receive a discharge drive signal to shut down the LDO module when the voltage of the starting power supply is lower than a preset undervoltage; the operational amplifier module includes a first operational amplifier and a second operational amplifier, the positive input terminal of the first operational amplifier and the negative input terminal of the second operational amplifier are both connected to the negative terminal of the starting power supply, and the negative input terminal of the first operational amplifier and the positive input terminal of the second operational amplifier are both connected to the negative terminal of the power supply; the output terminal of the first operational amplifier is connected to the first low-power detection terminal of the power controller, and the output terminal of the second operational amplifier is connected to the second low-power detection terminal of the power controller, so that the power controller is shut down when the voltage of the first low-power detection terminal is equal to the voltage of the second low-power detection terminal for a period of time longer than a preset time. The voltage at the first low-power detection terminal is used to detect the voltage change between the negative terminal of the startup power supply and the negative terminal of the user power supply. The voltage at the second low-power detection terminal is used to detect the voltage change between the negative terminal of the startup power supply and the negative terminal of the user power supply. When the two are equal, the voltage between the negative terminal of the startup power supply and the negative terminal of the user power supply is the same. At this time, the startup power supply is in a state of no current output, i.e., the non-discharge time is too long, and the power controller is turned off to reduce power consumption. When the startup power supply is undervoltage, the LDO module is turned off through the discharge drive signal to further reduce power consumption.

[0022] Please see Figure 1 This is a circuit diagram of a motorcycle starting power protection circuit according to an embodiment of the present disclosure.

[0023] One embodiment of a motorcycle starting power protection circuit 10 includes a starting power module 100, an LDO module 200, and an operational amplifier module 300. Please refer to the accompanying documentation. Figure 2 The startup power supply module 100 includes a power controller U1 and a startup activation circuit. The input terminal of the startup activation circuit is used to receive an activation signal, and the output terminal of the startup activation circuit is connected to the activation terminal of the power controller U1. The input terminal of the LDO module 200 is used to connect to the positive terminal B+ of the startup power supply, and the control terminal of the LDO module 200 is used to receive a discharge drive signal DSG to shut down the LDO module 200 when the voltage of the startup power supply is lower than a preset undervoltage condition. Please refer to the following: Figure 3The operational amplifier module 300 includes a first operational amplifier U5A and a second operational amplifier U6. The positive input terminal of the first operational amplifier U5A and the negative input terminal of the second operational amplifier U6 are both connected to the negative terminal B- of the power supply. The negative input terminal of the first operational amplifier U5A and the positive input terminal of the second operational amplifier U6 are both connected to the negative terminal P- of the power supply. The output terminal of the first operational amplifier U5A is connected to the first low-power detection terminal EN / AD2 of the power controller U1, and the output terminal of the second operational amplifier U6 is connected to the second low-power detection terminal EN / AD3 of the power controller U1. The power controller U1 is turned off when the voltage of the first low-power detection terminal EN / AD2 is equal to the voltage of the second low-power detection terminal EN / AD3 for a period of time that is greater than a preset time.

[0024] In this embodiment, the voltage of the first low-power detection terminal EN / AD2 is used for a primary detection of the voltage change between the negative terminal B- of the startup power supply and the negative terminal P- of the power consumption. The voltage of the second low-power detection terminal EN / AD3 is used for a secondary detection of the voltage change between the negative terminal B- of the startup power supply and the negative terminal P- of the power consumption. When the two are equal, the voltage between the negative terminal B- of the startup power supply and the negative terminal P- of the power consumption is the same. At this time, the startup power supply is in a state of no current output, i.e., the non-discharge time is too long, and the power controller U1 is turned off to reduce power consumption. When the startup power supply is undervoltage, the LDO module 200 is turned off through the discharge drive signal DSG to further reduce power consumption.

[0025] In one embodiment, please refer to Figure 3The operational amplifier module 300 further includes a first resistor R36, a second resistor R47, and a third resistor R28. The first end of the first resistor R36 is connected to the negative terminal B- of the startup power supply, and the second end of the first resistor R36 is connected to the positive input terminal of the first operational amplifier U5A. The second end of the first resistor R36 is also grounded through the second resistor R47. The first end of the third resistor R28 is connected to the negative terminal P-, and the second end of the third resistor R28 is connected to the negative input terminal of the first operational amplifier U5A. In this embodiment, the first resistor R36 and the second resistor R47 form a voltage divider circuit. The voltage at the negative terminal B- of the startup power supply is applied to the positive input terminal of the first operational amplifier U5A after being divided by the first resistor R36 and the second resistor R47. Through the voltage division by the first resistor R36 and the second resistor R47, the voltage at the negative terminal B- of the startup power supply is proportionally input to the positive input terminal of the first operational amplifier U5A, so that the voltage at the positive input terminal of the first operational amplifier U5A forms a specified comparison reference voltage. The third resistor R28 is connected in series with the negative input terminal of the first operational amplifier U5A. The third resistor R28 limits the current of the negative input terminal P- to avoid excessive current at the negative input terminal of the first operational amplifier U5A, and ensures accurate comparison of the voltage level of the negative input terminal P-.

[0026] In another embodiment, at least one of the first resistor R36 and the second resistor R47 is an adjustable resistor. By adjusting the resistance ratio of the first resistor R36 to the second resistor R47, the magnitude of the comparison reference voltage of the first operational amplifier U5A can be adjusted to adapt to the voltage comparison of different electrical devices.

[0027] In one embodiment, please refer to Figure 3The operational amplifier module 300 further includes a fourth resistor R41, a fifth resistor R42, and a sixth resistor R39. The first end of the fourth resistor R41 is connected to the negative terminal P-, and the second end of the fourth resistor R41 is connected to the positive input terminal of the second operational amplifier U6. The second end of the fourth resistor R41 is also grounded through the fifth resistor R42. The first end of the sixth resistor R39 is connected to the negative terminal B- of the power supply, and the second end of the sixth resistor R39 is connected to the negative input terminal of the second operational amplifier U6. In this embodiment, the fourth resistor R41 and the fifth resistor R42 form a voltage divider circuit. The voltage at the negative terminal P- is applied to the positive input terminal of the second operational amplifier U6 after being divided by the fourth resistor R41 and the fifth resistor R42. The voltage division by the fourth resistor R41 and the fifth resistor R42 facilitates the proportional input of the voltage at the negative terminal P- to the positive input terminal of the second operational amplifier U6. The sixth resistor R39 is connected in series with the negative input terminal of the second operational amplifier U6. The sixth resistor R39 limits the current to the negative terminal B- of the startup power supply to avoid excessive current at the negative input terminal of the second operational amplifier U6 and to ensure the stability of the reference voltage of the second operational amplifier U6.

[0028] In one embodiment, please refer to Figure 3 The operational amplifier module 300 further includes a third operational amplifier U5B, a seventh resistor R48, and an eighth resistor R49. The output terminal of the first operational amplifier U5A is connected to the positive input terminal of the third operational amplifier U5B. The first terminal of the seventh resistor R48 is connected to the negative input terminal of the third operational amplifier U5B, and the second terminal of the seventh resistor R48 is grounded. The first terminal of the seventh resistor R48 is also connected to the output terminal of the third operational amplifier U5B through the eighth resistor R49. The output terminal of the third operational amplifier U5B is connected to the first low-power detection terminal EN / AD2. In this embodiment, the third operational amplifier U5B serves as the voltage amplifier of the first operational amplifier U5A. Specifically, the third operational amplifier U5B amplifies the first-stage comparison voltage between the negative terminal P- voltage of the power supply and the negative terminal B- voltage of the startup power supply, thereby enabling more accurate detection of the comparison between the negative terminal P- voltage of the power supply and the negative terminal B- voltage of the startup power supply. This improves the accuracy of the voltage of the startup power supply module 100 at the first low-power detection terminal EN / AD2.

[0029] In one embodiment, please refer to Figure 4The startup activation circuit includes a charging optocoupler U10, a ninth resistor R118, and a first activation diode D3. The first terminal of the ninth resistor R118 is connected to the charging positive terminal, and the second terminal of the ninth resistor R118 is connected to the light-emitting positive terminal of the charging optocoupler U10. The light-emitting negative terminal of the charging optocoupler U10 is grounded, and the light-receiving negative terminal of the charging optocoupler U10 is grounded. The light-receiving positive terminal of the charging optocoupler U10 is connected to the positive terminal of the first activation diode D3, and the negative terminal of the first activation diode D3 is connected to the activation terminal of the power controller U1. In this embodiment, the charging optocoupler U10 separates the charging terminal from the activation terminal to reduce the impact of the charging terminal on the activation of the startup power module 100. The first terminal of the ninth resistor R118 receives the charging signal from the charging terminal; specifically, the charging positive terminal is the positive terminal of the charger or the USB positive terminal. By connecting the charging signal to the positive terminal of the charging optocoupler U10, the activation terminal of the power controller U1 can be grounded, thereby setting the activation terminal of the power controller U1 to zero, i.e., the activation voltage of the power controller U1 is 0, so as to turn off the power controller U1 and reduce power consumption.

[0030] Further, please refer to Figure 2 The startup activation circuit includes a tenth resistor R13 and a second activation diode D7. The first end of the tenth resistor R13 is connected to the activation terminal of the power controller U1, the second end of the tenth resistor R13 is connected to the anode of the second activation diode D7, and the cathode of the second activation diode D7 is connected to the cathode of the first activation diode D3. In this embodiment, the tenth resistor R13 is connected in series with the activation terminal of the power controller U1. The tenth resistor R13 limits the current at the activation terminal of the power controller U1 to prevent excessive current. Furthermore, the second activation diode D7 acts as a unidirectional current transistor at the activation terminal of the power controller U1, preventing current surges at the activation terminal of the power controller U1 after power-on.

[0031] In one embodiment, please refer to Figure 2 The activation circuit includes an activation button switch SW1. One end of the activation button switch SW1 is connected to the activation terminal of the power controller U1, and the other end of the activation button switch SW1 is grounded. In this embodiment, the activation button switch SW1 serves as an activation switch for the power controller U1. After being triggered by external pressure, the activation button switch SW1 grounds the activation terminal of the power controller U1, thereby mechanically activating the power controller U1.

[0032] In one embodiment, please refer to Figure 2The activation circuit includes a first electronic switch Q1, a second electronic switch Q2, and an eleventh resistor R18. The first terminal of the eleventh resistor R18 is connected to a reference power supply, and the second terminal of the eleventh resistor R18 is connected to the first terminal of the first electronic switch Q1. The control terminal of the first electronic switch Q1 is connected to the output terminal of the first operational amplifier U5A, and the second terminal of the first electronic switch Q1 is grounded. The second terminal of the eleventh resistor R18 is also connected to the first terminal of the second electronic switch Q2. The control terminal of the second electronic switch Q2 is connected to the output terminal of the second operational amplifier U6, and the second terminal of the second electronic switch Q2 is grounded. The second terminal of the eleventh resistor R18 is also connected to the activation terminal of the power controller U1. In this embodiment, the first terminals of both the first electronic switch Q1 and the second electronic switch Q2 are connected to the reference power supply through the eleventh resistor R18, providing a reference voltage for the first terminals of the first electronic switch Q1 and the second electronic switch Q2. The switching on and off of the first electronic switch Q1 is controlled by the voltage at the output terminal of the first operational amplifier U5A, and the switching on and off of the second electronic switch Q2 is controlled by the voltage at the output terminal of the second operational amplifier U6. When the power supply has current output, the output terminals of the first operational amplifier U5A and the second operational amplifier U6 output opposite voltages, that is, one outputs a low level and the other outputs a high level, so that the voltage at the activation terminal of the power controller U1 is clamped to ground, thereby activating the power controller U1.

[0033] In another embodiment, both the first electronic switch Q1 and the second electronic switch Q2 are NPN transistors. The first terminal of the first electronic switch Q1 and the first terminal of the second electronic switch Q2 are the collectors of the NPN transistors, and the second terminals of the first electronic switch Q1 and the second electronic switch Q2 are the emitters of the NPN transistors. The control terminals of the first electronic switch Q1 and the second electronic switch Q2 are the bases of the NPN transistors. When the power supply has current output, the voltage at the negative terminal B- of the power supply is lower than the voltage at the negative terminal P- of the power consumption terminal. At this time, the first operational amplifier U5A outputs a low level, and the second operational amplifier U6 outputs a high level, so that the first electronic switch Q1 is turned off and the second electronic switch Q2 is turned on. When the power supply has no current output, the voltage at the negative terminal B- of the power supply is equal to the voltage at the negative terminal P- of the power consumption terminal. At this time, both the first operational amplifier U5A and the second operational amplifier U6 output a low level, so that both the first electronic switch Q1 and the second electronic switch Q2 are turned off.

[0034] In one embodiment, please refer to Figure 4The LDO module 200 includes an LDO voltage drop converter U3, a third electronic switch M13, a fourth electronic switch Q16, and a twelfth resistor R115. The first terminal of the third electronic switch M13 is connected to the positive terminal B+ of the startup power supply. The second terminal of the third electronic switch M13 is connected to the input terminal of the LDO voltage drop converter U3. The first terminal of the third electronic switch M13 is also connected to its control terminal through the twelfth resistor R115. The control terminal of the third electronic switch M13 is connected to the first terminal of the fourth electronic switch Q16. The second terminal of the fourth electronic switch Q16 is grounded and receives the discharge drive signal DSG. In this embodiment, the LDO voltage drop converter U3 is used to step down the output voltage of the startup power supply, and its operating voltage is supplied by the startup power supply. The third electronic switch M13 acts as a switch between the LDO voltage drop converter U3 and the startup power supply, regulating the on / off state of the output between them. The control terminal of the fourth electronic switch Q16 receives the discharge drive signal DSG, which corresponds to an undervoltage state of the startup power supply. Specifically, when the startup power supply voltage is undervoltage, the discharge drive signal DSG is at a low level. When the startup power supply voltage is undervoltage, the fourth electronic switch Q16 is turned off, causing the third electronic switch M13 to turn off simultaneously, facilitating the shutdown of the LDO voltage drop converter U3. Conversely, when the startup power supply voltage is normal, the fourth electronic switch Q16 is turned on, causing the third electronic switch M13 to turn on simultaneously, facilitating the startup of the LDO voltage drop converter U3.

[0035] In another embodiment, the third electronic switch M13 is an N-type MOSFET, with its first terminal serving as the drain, its second terminal as the source, and its control terminal as the gate. The fourth electronic switch Q16 is a P-type MOSFET, with its first terminal serving as the source, its second terminal as the drain, and its control terminal as the gate.

[0036] In one embodiment, please refer to Figure 5The motorcycle starting power supply protection circuit 10 further includes an overcurrent protection detection module 400. The overcurrent protection detection module 400 includes an overcurrent protection main controller U9, a first common-drain dual MOS module M12, a second common-drain dual MOS module M34, and a three-terminal switch S12. The power supply terminal of the overcurrent protection main controller U9 is connected to the positive terminal B+ of the starting power supply, the first current detection terminal of the overcurrent protection main controller U9 is connected to the negative terminal B- of the starting power supply, and the second current detection terminal of the overcurrent protection main controller U9 is connected to the negative terminal P- of the power supply. The first common-drain dual MOS module M12 and the second common-drain dual MOS module M34... 4 are connected in parallel between the negative terminal B- of the starting power supply and the negative terminal P- of the power consumption, forming a current detection main circuit between the negative terminal B- of the starting power supply and the negative terminal P- of the power consumption. The input terminal of the three-terminal switch S12 is connected to the current detection main circuit. The switching terminals of the three-terminal switch S12 are respectively connected to the control terminals of the first common-drain dual MOS module M12 and the control terminals of the second common-drain dual MOS module M34, or the first terminal of the first common-drain dual MOS module M12 and the first terminal of the second common-drain dual MOS module M34, so as to switch the conduction of the first common-drain dual MOS module M12 and the second common-drain dual MOS module M34.

[0037] In this embodiment, the first common-drain dual MOS module M12 and the second common-drain dual MOS module M34 are common-drain dual MOS, meaning that the two drains are physically connected together through a metal interconnect layer during chip manufacturing. Specifically, the common-drain dual MOS consists of two N-MOS transistors connected in series with their drains connected. Typically, there is a milliohm-level internal resistance between the two drains. The internal resistance of the first common-drain dual MOS module M12 is different from that of the second common-drain dual MOS module M34. The first common-drain dual MOS module M12 and the second common-drain dual MOS module M34 are connected in parallel between the negative terminal B- and the negative terminal P- of the startup power supply. The first common-drain dual MOS module M12 and the second common-drain dual MOS module M34 serve as two current-sensing resistors with different resistance values, facilitating the overcurrent protection controller U9 to detect the overcurrent capability of the startup power supply and thus providing overcurrent protection detection for the startup power supply. The three-terminal switch S12 serves as a switching component for the first common-drain dual MOS module M12 and the second common-drain dual MOS module M34. By adjusting the switching terminals of the three-terminal switch S12, it is convenient to select the corresponding common-drain dual MOS module as the current detection module, so as to improve the overcurrent protection detection of startup power supplies with different overcurrent capabilities, thereby improving the adaptability of overcurrent protection detection.

[0038] Further, please refer to Figure 5The first switching terminal of the three-terminal switch S12 is connected to the first terminal of the first common-drain dual MOS module M12, and the second switching terminal of the three-terminal switch S12 is connected to the first terminal of the second common-drain dual MOS module M34. The control terminal of the first common-drain dual MOS module M12 is connected to the first current detection control terminal of the overcurrent protection master controller U9, and the control terminal of the second common-drain dual MOS module M34 is connected to the second current detection control terminal of the overcurrent protection master controller U9. In this embodiment, the three-terminal switch S12 is connected in series on the main circuit of the first common-drain dual MOS module M12 and the second common-drain dual MOS module M34, that is, on the main link of the parallel circuit of the first common-drain dual MOS module M12 and the second common-drain dual MOS module M34. The three-terminal switch S12 facilitates switching between the branches containing the first common-drain dual MOS module M12 and the second common-drain dual MOS module M34 through the switching port, thereby facilitating the selection of the corresponding equivalent current detection resistor during the current detection process. The first and second current detection control terminals of the overcurrent protection main controller U9 output high levels to ensure that the corresponding common-drain dual MOS module is quickly turned on after the three-terminal switch S12 switches.

[0039] In another embodiment, the input terminal of the three-terminal switch S12 can be connected to the negative terminal B- of the power supply or to the negative terminal P- of the power consumption.

[0040] In another embodiment, there are two three-terminal switches S12. The input terminal of one three-terminal switch S12 is connected to the negative terminal B- of the power supply, and the input terminal of the other three-terminal switch S12 is connected to the negative terminal P- of the power supply. During switching, the two three-terminal switches S12 switch together to the same common-drain dual MOS module.

[0041] Furthermore, please refer to Figure 6 The input terminal of the three-terminal switch S12 is also connected to the current detection control terminal of the overcurrent protection master controller U9. The first switching terminal of the three-terminal switch S12 is connected to the control terminal of the first common-drain dual MOS module M12, and the second switching terminal of the three-terminal switch S12 is connected to the control terminal of the second common-drain dual MOS module M34. In this embodiment, the three-terminal switch S12 switches the control signal of the overcurrent protection master controller U9, that is, switches the signal to the control terminal of the first common-drain dual MOS module M12 and the control terminal of the second common-drain dual MOS module M34, so as to facilitate switching the on / off state of the first common-drain dual MOS module M12 and the second common-drain dual MOS module M34, thereby realizing the switching of common-drain dual MOS modules with different equivalent internal resistances.

[0042] In another embodiment, the input terminal of the three-terminal switch S12 can be connected to the first current detection control terminal of the overcurrent protection master controller U9, or it can be connected to the second current detection control terminal of the overcurrent protection master controller U9.

[0043] In another embodiment, there are two three-terminal switches S12, one of which has its input terminal connected to the first current detection control terminal of the overcurrent protection master controller U9, and the other has its input terminal connected to the second current detection control terminal of the overcurrent protection master controller U9.

[0044] In one embodiment, this disclosure also provides a motorcycle starting power supply, including the motorcycle starting power supply protection circuit described in any of the above embodiments. In this embodiment, the motorcycle starting power protection circuit includes a starting power module, an LDO module, and an operational amplifier module. The starting power module includes a power controller and a starting activation circuit. The input terminal of the starting activation circuit is used to receive an activation signal, and the output terminal of the starting activation circuit is connected to the activation terminal of the power controller. The input terminal of the LDO module is used to connect to the positive terminal of the starting power supply, and the control terminal of the LDO module is used to receive a discharge drive signal to shut down the LDO module when the voltage of the starting power supply is lower than a preset undervoltage. The operational amplifier module includes a first operational amplifier and a second operational amplifier. The positive input terminal of the first operational amplifier and the negative input terminal of the second operational amplifier are both connected to the negative terminal of the starting power supply, and the negative input terminal of the first operational amplifier and the positive input terminal of the second operational amplifier are both connected to the negative terminal of the power supply. The output terminal of the first operational amplifier is connected to the first low-power detection terminal of the power controller, and the output terminal of the second operational amplifier is connected to the second low-power detection terminal of the power controller, so that the power controller is shut down when the voltage of the first low-power detection terminal is equal to the voltage of the second low-power detection terminal for a period of time longer than a preset time. The voltage at the first low-power detection terminal is used to detect the voltage change between the negative terminal of the startup power supply and the negative terminal of the user power supply. The voltage at the second low-power detection terminal is used to detect the voltage change between the negative terminal of the startup power supply and the negative terminal of the user power supply. When the two are equal, the voltage between the negative terminal of the startup power supply and the negative terminal of the user power supply is the same. At this time, the startup power supply is in a state of no current output, i.e., the non-discharge time is too long, and the power controller is turned off to reduce power consumption. When the startup power supply is undervoltage, the LDO module is turned off through the discharge drive signal to further reduce power consumption.

[0045] The embodiments described above are merely illustrative of several implementations of this disclosure, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this disclosure, and these all fall within the protection scope of this disclosure. Therefore, the protection scope of this patent should be determined by the appended claims.

Claims

1. A motorcycle starting power supply protection circuit, characterized by, The application relates to a power supply module, which comprises a starting power supply module, an LDO module and an operational amplifier module. The starting power supply module comprises a power supply controller and a starting activation circuit, the input end of the starting activation circuit is used for receiving an activation signal, and the output end of the starting activation circuit is connected with the activation end of the power supply controller. The LDO module is connected with the positive pole of the starting power supply, and the control end of the LDO module is used for receiving a discharge driving signal to turn off the LDO module when the voltage of the starting power supply is lower than a preset under-voltage. The operational amplifier module comprises a first operational amplifier and a second operational amplifier, the input positive pole of the first operational amplifier and the input negative pole of the second operational amplifier are connected with the negative pole of the starting power supply, the input negative pole of the first operational amplifier and the input positive pole of the second operational amplifier are connected with the power consumption negative pole, the output end of the first operational amplifier is connected with the first low-power consumption detection end of the power supply controller, and the output end of the second operational amplifier is connected with the second low-power consumption detection end of the power supply controller, so that the power supply controller is turned off when the time for the voltage of the first low-power consumption detection end to be equal to the voltage of the second low-power consumption detection end is greater than a preset time.

2. The motorcycle starting power supply protection circuit of claim 1, wherein, The operational amplifier module further comprises a first resistor, a second resistor and a third resistor, the first end of the first resistor is connected with the negative pole of the starting power supply, the second end of the first resistor is connected with the input positive pole of the first operational amplifier, and the second end of the first resistor is further connected with the ground through the second resistor; the first end of the third resistor is connected with the power consumption negative pole, and the second end of the third resistor is connected with the input negative pole of the first operational amplifier.

3. The motorcycle starting power supply protection circuit of claim 1, wherein, The operational amplifier module further comprises a fourth resistor, a fifth resistor and a sixth resistor, the first end of the fourth resistor is connected with the power consumption negative pole, the second end of the fourth resistor is connected with the input positive pole of the second operational amplifier, and the second end of the fourth resistor is further connected with the ground through the fifth resistor; the first end of the sixth resistor is connected with the negative pole of the starting power supply, and the second end of the sixth resistor is connected with the input negative pole of the second operational amplifier.

4. The motorcycle starting power supply protection circuit of claim 1, wherein, The operational amplifier module further comprises a third operational amplifier, a seventh resistor and an eighth resistor, the output end of the first operational amplifier is connected with the input positive pole of the third operational amplifier, the first end of the seventh resistor is connected with the input negative pole of the third operational amplifier, the second end of the seventh resistor is connected with the ground, the first end of the seventh resistor is further connected with the output end of the third operational amplifier through the eighth resistor, and the output end of the third operational amplifier is connected with the first low-power consumption detection end.

5. The motorcycle starting power supply protection circuit of claim 1, wherein, The starting activation circuit comprises a charging optical coupler, a ninth resistor and a first activation diode, the first end of the ninth resistor is connected with the charging positive pole, the second end of the ninth resistor is connected with the light-emitting positive pole of the charging optical coupler, the light-emitting negative pole of the charging optical coupler is connected with the ground, the light-receiving negative pole of the charging optical coupler is connected with the ground, the light-receiving positive pole of the charging optical coupler is connected with the positive pole of the first activation diode, and the negative pole of the first activation diode is connected with the activation end of the power supply controller.

6. A motorcycle starting power supply protection circuit according to claim 5, characterised in that, The starting activation circuit comprises a tenth resistor and a second activation diode, a first end of the tenth resistor is connected with an activation end of the power controller, a second end of the tenth resistor is connected with a positive electrode of the second activation diode, and a negative electrode of the second activation diode is connected with a negative electrode of the first activation diode.

7. The motorcycle starting power supply protection circuit of claim 1, wherein, The starting activation circuit comprises an activation key switch, one end of the activation key switch is connected with an activation end of the power controller, and the other end of the activation key switch is grounded.

8. The motorcycle starting power supply protection circuit of claim 1, wherein, The starting activation circuit comprises a first electronic switch tube, a second electronic switch tube and an eleventh resistor, a first end of the eleventh resistor is used for being connected with a reference power supply, a second end of the eleventh resistor is connected with a first end of the first electronic switch tube, a control end of the first electronic switch tube is connected with an output end of the first operational amplifier, a second end of the first electronic switch tube is grounded; the second end of the eleventh resistor is also connected with a first end of the second electronic switch tube, a control end of the second electronic switch tube is connected with an output end of the second operational amplifier, and a second end of the second electronic switch tube is grounded; wherein the second end of the eleventh resistor is also connected with an activation end of the power controller.

9. The motorcycle starting power supply protection circuit of claim 1, wherein, The LDO module comprises an LDO voltage dropper, a third electronic switch tube, a fourth electronic switch tube and a twelfth resistor, a first end of the third electronic switch tube is connected with a positive electrode of a starting power supply, a second end of the third electronic switch tube is connected with an input end of the LDO voltage dropper, the first end of the third electronic switch tube is also connected with a control end of the third electronic switch tube through the twelfth resistor, the control end of the third electronic switch tube is connected with a first end of the fourth electronic switch tube, a second end of the fourth electronic switch tube is grounded, and the second end of the fourth electronic switch tube receives a discharge driving signal.

10. A motorcycle starting power supply characterized by comprising: The motorcycle starting power supply protection circuit comprises the motorcycle starting power supply protection circuit according to any one of claims 1 to 9. The motorcycle starting power supply protection circuit comprises the motorcycle starting power supply protection circuit according to any one of claims 1 to 9.

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