Electric vehicle secondary loop power supply control circuit and electric vehicle

Abstract

The utility model relates to the technical field of electric vehicle circuits, and discloses an electric vehicle secondary loop power supply control circuit and an electric vehicle. The controller is connected with the input and output module through the communication interface, so that the signal output of the input and output module is controlled by controlling the signal of the communication interface; the short circuit determination module is connected with the input and output module, so that the interrupt interface voltage of the interrupt interface of the controller is determined through the output voltage of the input and output module; and finally, the controller judges whether the output end of the circuit is short-circuited by detecting the interrupt interface voltage.

Description

Technical Field

[0001] The present application relates to the technical field of electric vehicles, and in particular to an electric vehicle secondary loop power supply control circuit and an electric vehicle. Background Art

[0002] Each battery of a national standard electric bicycle needs to contain a secondary circuit power supply and the secondary circuit power supply needs to be controlled to provide an auxiliary power supply to the electric bicycle's vehicle alarm system; when the electric bicycle's vehicle alarm system is powered by the secondary circuit power supply, short circuits often occur, causing damage to the secondary circuit power supply control circuit and more likely damaging the use of the battery pack. Utility Model Content

[0003] In view of this, an embodiment of the present application provides an electric vehicle secondary loop power supply control circuit and an electric vehicle, which can effectively implement short-circuit detection of the electric vehicle secondary loop power supply.

[0004] In a first aspect, an embodiment of the present application provides an electric vehicle secondary loop power supply control circuit, comprising: a controller, an input and output module, and a short circuit determination module;

[0005] The controller is connected to the input-output module via a communication interface, and is used to control the output of the input-output module signal by controlling the signal of the communication interface;

[0006] The short circuit determination module is connected to the input-output module and is used to determine the port voltage of the interrupt interface of the controller through the output voltage of the input-output module;

[0007] The controller is also used to determine whether a short circuit occurs at the output end of the circuit by detecting the interrupt interface voltage.

[0008] In some embodiments, the input-output module includes a first drive switch circuit, a first transistor, a second drive switch circuit, a second transistor, a power supply, a third drive switch circuit, a first field effect transistor, a fourth drive switch circuit, a third transistor, and an output conduction circuit;

[0009] One end of the first driving switch circuit is connected to the communication interface, and the other end is connected to the first transistor; one end of the second driving switch circuit is connected to the first transistor, and the other end is connected to the second transistor;

[0010] One end of the third driving switch circuit is connected to the connection line between the power supply and the first end of the first field effect transistor; the other end of the third driving switch circuit is connected to the second end of the first field effect transistor;

[0011] The third end of the first field effect transistor is connected to the fourth drive switch circuit; the other end of the fourth drive switch circuit is connected to one end of the third transistor; the other end of the third transistor is connected to one end of the output conduction circuit; the second end of the output conduction circuit is connected to the input end of the control circuit; the third end of the output conduction circuit is connected to the output end of the control circuit.

[0012] In some embodiments, the short circuit determination module includes a fifth drive switch circuit and a fourth transistor;

[0013] One end of the fifth driving switch circuit is connected to the output end of the control circuit; the other end of the fifth driving switch circuit is connected to the fourth transistor; the other end of the fourth transistor is connected to the input-output module;

[0014] The interrupt interface is connected to the connection line between the fourth transistor and the input-output module.

[0015] In some embodiments, the first driving switch circuit includes a first diode, a first current limiting resistor and a first voltage dividing resistor;

[0016] The anode of the first diode is connected to the communication interface; the cathode of the first diode is connected to one end of the first current limiting resistor; the other end of the first current limiting resistor is connected to the base end of the first transistor; the collector end of the first transistor is connected to the second drive switch circuit; the emitter end of the first transistor is grounded;

[0017] One end of the first voltage-dividing resistor is connected to the connection line between the first current-limiting resistor and the first transistor; the other end of the first voltage-dividing resistor is connected to the line where the emitter terminal of the first transistor is grounded.

[0018] In some embodiments, the second driving switch circuit includes a second current limiting resistor and a second voltage dividing resistor;

[0019] One end of the second current limiting resistor is connected to the first transistor; the other end of the second current limiting resistor is connected to the base terminal of the second transistor;

[0020] One end of the second voltage-dividing resistor is connected to the line connecting the second current-limiting resistor and the second transistor; the other end of the second voltage-dividing resistor is connected to the line connecting the input end of the control circuit and the second transistor.

[0021] In some embodiments, the third driving switch circuit includes a third voltage-dividing resistor and a fourth voltage-dividing resistor;

[0022] One end of the fourth voltage-dividing resistor is connected to the short-circuit determination module; the other end of the fourth voltage-dividing resistor is connected to the third voltage-dividing resistor; the other end of the third voltage-dividing resistor is connected to the connecting line connected to the power supply and the source of the first field effect transistor; the gate of the first field effect transistor is connected to the connecting line between the third voltage-dividing resistor and the fourth voltage-dividing resistor; the drain of the first field effect transistor is connected to the fourth drive switch circuit.

[0023] In some embodiments, the fourth driving switch circuit includes a third current limiting resistor, a second diode, a fourth current limiting resistor and a fifth voltage dividing resistor;

[0024] One end of the third current limiting resistor is connected to the first field effect transistor; the other end of the third current limiting resistor is connected to the anode of the second diode; the cathode of the second diode is connected to the fourth current limiting resistor; the other end of the fourth current limiting resistor is connected to the base of the third transistor; the emitter of the third transistor is grounded; the collector of the third transistor is connected to the output conduction circuit; one end of the fifth voltage dividing resistor is connected to the ground wire of the collector of the third transistor, and the other end of the fifth voltage dividing resistor is connected to the connecting wire between the fourth current limiting resistor and the third transistor.

[0025] In some embodiments, the output conduction circuit includes a sixth voltage-dividing resistor, a seventh voltage-dividing resistor, a second field effect transistor, and a third field effect transistor;

[0026] One end of the sixth voltage-dividing resistor is connected to the third triode; the other end of the sixth voltage-dividing resistor is connected to the seventh voltage-dividing resistor; the other end of the seventh voltage-dividing resistor is connected to the connection line between the second field effect transistor and the third field effect transistor;

[0027] The gate of the second field effect transistor and the gate of the third field effect transistor are both connected to the connecting line of the sixth voltage-dividing resistor and the seventh voltage-dividing resistor; the drain of the second field effect transistor is connected to the input end of the control circuit; and the drain of the third field effect transistor is connected to the output end of the control circuit.

[0028] In some embodiments, the fifth driving switch circuit includes a fifth current limiting resistor, an eighth voltage dividing resistor and a sixth current limiting resistor;

[0029] One end of the fifth current-limiting resistor is connected to the output end of the control circuit; the other end is connected to the eighth voltage-dividing resistor; one end of the sixth current-limiting resistor is connected to the connection line between the fifth current-limiting resistor and the eighth voltage-dividing resistor; the other end of the sixth current-limiting resistor is connected to the base of the fourth triode; the emitter of the fourth triode is grounded; one end of the eighth voltage-dividing resistor is connected to the ground line of the emitter of the fourth triode; the collector of the fourth triode is connected to the third driving switch circuit;

[0030] The interrupt interface is connected to a connection line between the fourth transistor and the third driving switch circuit.

[0031] In a second aspect, an embodiment of the present application provides an electric vehicle, including: an electric vehicle secondary loop power supply control circuit as described above.

[0032] The embodiments of the present application have the following beneficial effects: the controller of the present application is connected to the input-output module via a communication interface, thereby realizing controlling the output of the input-output module signal by controlling the signal of the communication interface; the short-circuit determination module is connected to the input-output module, thereby realizing determining the interrupt interface voltage of the controller interrupt interface by the output voltage of the input-output module; finally, the controller determines whether a short circuit occurs at the output end of the circuit by detecting the interrupt interface voltage. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0034] Figure 1 A schematic diagram showing a structure of an electric vehicle secondary loop power supply control circuit according to an embodiment of the present application is shown;

[0035] Figure 2 A circuit diagram of an electric vehicle secondary loop power supply control circuit according to an embodiment of the present application is shown. DETAILED DESCRIPTION

[0036] The technical solutions in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments.

[0037] The components of the embodiments of the present application generally described and shown in the drawings herein may be arranged and designed in various configurations. Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the application claimed for protection, but merely represents the selected embodiments of the present application. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without making creative work belong to the scope of protection of the present application.

[0038] Hereinafter, the terms "including", "having" and their cognates that can be used in various embodiments of the present application are intended only to indicate specific features, numbers, steps, operations, elements, components or a combination of the foregoing items, and should not be understood as first excluding the existence of one or more other features, numbers, steps, operations, elements, components or a combination of the foregoing items or increasing the possibility of one or more features, numbers, steps, operations, elements, components or a combination of the foregoing items. In addition, the terms "first", "second", "third" and the like are only used to distinguish descriptions and cannot be understood as indicating or implying relative importance.

[0039] Unless otherwise defined, all terms (including technical terms and scientific terms) used herein have the same meanings as those generally understood by those skilled in the art to which the various embodiments of the present application belong. The terms (such as those defined in generally used dictionaries) will be interpreted as having the same meanings as the contextual meanings in the relevant technical field and will not be interpreted as having idealized meanings or overly formal meanings unless clearly defined in the various embodiments of the present application.

[0040] In conjunction with the accompanying drawings, some embodiments of the present application are described in detail below. In the absence of conflict, the following embodiments and features in the embodiments can be combined with each other.

[0041] The electric vehicle secondary loop power supply control circuit is described below in conjunction with some specific embodiments.

[0042] Figure 1 A structural block diagram of an electric vehicle secondary loop power supply control circuit of an embodiment of the present application is shown. Exemplarily, the electric vehicle secondary loop power supply control circuit includes: a controller 100, an input-output module 200, and a short-circuit determination module 300; the controller 100 is connected to the input-output module 200 through a communication interface, and is used to control the output of the input-output module 200 signal by controlling the signal of the communication interface; the short-circuit determination module 300 is connected to the input-output module 200, and is used to determine the interrupt interface voltage of the controller 100 interrupt interface through the output voltage of the input-output module 200; the controller 100 determines whether a short circuit occurs at the circuit output end by detecting the interrupt interface voltage.

[0043] The input-output module 200 includes a first drive switch circuit, a first transistor Q1, a second drive switch circuit, a second transistor Q2, a power supply (3.3V power supply), a third drive switch circuit, a first field effect transistor Q'1, a fourth drive switch circuit, a third transistor Q3 and an output conduction circuit; one end of the first drive switch circuit is connected to the communication interface, and the other end is connected to the first transistor Q1; one end of the second drive switch circuit is connected to the first transistor Q1, and the other end is connected to the second transistor Q2; one end of the third drive switch circuit is connected to to the connection line between the power supply and the first end of the first field effect transistor Q'1; the other end of the third drive switch circuit is connected to the second end of the first field effect transistor Q'1; the third end of the first field effect transistor Q'1 is connected to the fourth drive switch circuit; the other end of the fourth drive switch circuit is connected to one end of the third transistor Q3; the other end of the third transistor Q3 is connected to one end of the output conduction circuit; the second end of the output conduction circuit is connected to the input end of the control circuit; the third end of the output conduction circuit is connected to the output end of the control circuit.

[0044] The short circuit determination module 300 includes a fifth drive switch circuit and a fourth transistor Q4; one end of the fifth drive switch circuit is connected to the output end of the control circuit; the other end of the fifth drive switch circuit is connected to the fourth transistor Q4; the other end of the fourth transistor Q4 is connected to the input-output module 200; the interrupt interface is connected to the connection line between the fourth transistor Q4 and the input-output module 200.

[0045] Combine the following Figure 2 The specific control and short-circuit detection methods of the control circuit of the present application are described.

[0046] Since the positive electrode of the first diode D1 is connected to the communication interface; the negative electrode of the first diode D1 is connected to one end of the first current limiting resistor R1; the other end of the first current limiting resistor R1 is connected to the base end of the first transistor Q1; the collector end of the first transistor Q1 is connected to the second drive switch circuit; the emitter end of the first transistor Q1 is grounded; one end of the first voltage dividing resistor R'1 is connected to the connecting line between the first current limiting resistor R1 and the first transistor Q1; the other end of the first voltage dividing resistor R'1 is connected to the line where the emitter end of the first transistor Q1 is grounded. When the controller 100 controls the signal of the communication interface MCU_CON to be 3.3V high level, the base voltage of the first transistor Q1 is made greater than 0.7V through the first diode D1, the first current limiting resistor R1 and the first voltage divider resistor R'1, and a forward voltage is formed between the emitter and the base of the first transistor Q1, so that electrons flow from the N-type region to the P-type region (base region), and then as the electrons flow into the base region, the base current of the first transistor Q1 increases, which in turn causes the collector current of the first transistor Q1 to increase, thereby realizing the conduction of the first transistor Q1.

[0047] The current flows to the second driving switch circuit through the first transistor Q1, wherein the second driving switch circuit includes a second current limiting resistor R2 and a second voltage dividing resistor R'2; one end of the second current limiting resistor R2 is connected to the first transistor Q1; the other end of the second current limiting resistor R2 is connected to the base end of the second transistor Q2; one end of the second voltage dividing resistor R'2 is connected to the line connecting the second current limiting resistor R2 and the second transistor Q2; the other end of the second voltage dividing resistor R'2 is connected to the line connecting the input end of the control circuit and the second transistor Q2. In this way, the current flows to the second current limiting resistor R2 through the first transistor Q1, and then after the voltage is divided by the second voltage dividing resistor R'2, a forward bias exists between the base and the emitter of the second transistor Q2, thereby forming a large number of carriers flowing through the base region, so that the collector and the emitter of the second transistor Q2 are in a conducting state, thereby realizing the conduction of the second transistor Q2.

[0048] The input terminal VCC_IN+ of the control circuit of the present application is connected to the secondary input terminal VCC_IN1+ through the second field effect transistor Q'2, so the voltage of the input terminal VCC_IN+ passes through the internal diode of the second field effect transistor Q'2 to make the voltage of the secondary input terminal VCC_IN1+ equal to the voltage of the input terminal VCC_IN+ minus the voltage drop of the 0.7V diode, and then because the secondary input terminal VCC_IN1+ is connected to the positive electrode of the third diode D3 through the second transistor Q2, the negative electrode of the third diode D3 is connected to one end of the seventh current limiting resistor R7, and the other end of the seventh current limiting resistor R7 is connected to the output terminal of the control circuit. The above-mentioned voltage at the secondary input terminal VCC_IN1+ is equal to the voltage at the input terminal VCC_IN+ minus the voltage drop of a 0.7V diode. After the second transistor Q2 is turned on, the voltage at the input terminal VCC_IN1+ passes through the third diode D3 and the seventh current-limiting resistor R7 to make the voltage VCC_OUT+ equal to the voltage VCC_IN1+ minus the voltage drop of a 0.7V diode. That is, the voltage at the output terminal VCC_OUT+ of the control circuit is finally equal to the voltage at the input terminal VCC_IN+ minus the voltage drop of a 1.4V diode.

[0049] On this basis, whether the output end of the control circuit of the present application is short-circuited is explained. If the voltage of the interrupt interface of the controller 100 can activate the controller 100, it means that the output end of the control circuit is not short-circuited; if the voltage of the interrupt interface of the controller 100 cannot activate the controller 100, it means that the output end of the control circuit is short-circuited.

[0050] Specifically, the fifth drive switch circuit includes a fifth current limiting resistor R5, an eighth voltage dividing resistor R'8 and a sixth current limiting resistor R6; one end of the fifth current limiting resistor R5 is connected to the output end of the control circuit; the other end is connected to the eighth voltage dividing resistor R'8; one end of the sixth current limiting resistor R6 is connected to the connecting line between the fifth current limiting resistor R5 and the eighth voltage dividing resistor R'8; the other end of the sixth current limiting resistor R6 is connected to the base of the fourth transistor Q4; the emitter of the fourth transistor Q4 is grounded; one end of the eighth voltage dividing resistor R'8 is connected to the grounding line of the emitter of the fourth transistor Q4; the collector of the fourth transistor Q4 is connected to the third drive switch circuit; the interrupt interface is connected to the connecting line between the fourth transistor Q4 and the third drive switch circuit.

[0051] If the output terminal VCC_OUT+ voltage of the control circuit is short-circuited, the output terminal VCC_OUT+ is divided by the fifth current-limiting resistor R5 and the eighth voltage-dividing resistor R'8, and the base voltage of the fourth transistor Q4 is greater than 0.7V through the sixth current-limiting resistor R6, and a forward voltage is formed between the emitter and the base of the fourth transistor Q4, so that electrons flow from the N-type region to the P-type region (base region). As electrons flow into the base region of the fourth transistor Q4, the base current increases, which in turn causes the collector current of the fourth transistor Q4 to increase, thereby realizing the conduction of the fourth transistor Q4, causing the level of the interrupt interface MCU_INT to change from a high level of 3.3V to a low level of 0V. At this time, the voltage of the controller 100 interrupt interface MCU_INT can activate the controller 100. After the controller 100 is activated, the controller 100 can determine that the output terminal VCC_OUT+ of the control circuit of the present application and GND are not short-circuited.

[0052] Further, the third driving switch circuit includes a third voltage-dividing resistor R'3 and a fourth voltage-dividing resistor R'4; one end of the fourth voltage-dividing resistor R'4 is connected to the short circuit determination module 300; the other end of the fourth voltage-dividing resistor R'4 is connected to the third voltage-dividing resistor R'3; the other end of the third voltage-dividing resistor R'3 is connected to the connecting line connected to the power supply and the source of the first field effect transistor Q'1; the gate of the first field effect transistor Q'1 is connected to the connecting line between the third voltage-dividing resistor R'3 and the fourth voltage-dividing resistor R'4; the drain of the first field effect transistor Q'1 is connected to the fourth driving switch circuit.

[0053] The fourth driving switch circuit includes a third current limiting resistor R3, a second diode D2, a fourth current limiting resistor R4 and a fifth voltage dividing resistor R'5; one end of the third current limiting resistor R3 is connected to the first field effect transistor Q'1; the other end of the third current limiting resistor R3 is connected to the positive electrode of the second diode D2; the negative electrode of the second diode D2 is connected to the fourth current limiting resistor R4; the other end of the fourth current limiting resistor R4 is connected to the base of the third triode Q3; the emitter of the third triode Q3 is grounded; the collector of the third triode Q3 is connected to the output conduction circuit; one end of the fifth voltage dividing resistor R'5 is connected to the grounding line of the collector of the third triode Q3, and the other end of the fifth voltage dividing resistor R'5 is connected to the connecting line between the fourth current limiting resistor R4 and the third triode Q3.

[0054] The output conduction circuit includes a sixth voltage-dividing resistor R'6, a seventh voltage-dividing resistor R'7, a second field effect transistor Q'2 and a third field effect transistor Q'3; one end of the sixth voltage-dividing resistor R'6 is connected to the third triode Q3; the other end of the sixth voltage-dividing resistor R'6 is connected to the seventh voltage-dividing resistor R'7; the other end of the seventh voltage-dividing resistor R'7 is connected to the connecting line between the second field effect transistor Q'2 and the third field effect transistor Q'3; the gate of the second field effect transistor Q'2 and the gate of the third field effect transistor Q'3 are both connected to the connecting line between the sixth voltage-dividing resistor R'6 and the seventh voltage-dividing resistor R'7; the drain of the second field effect transistor Q'2 is connected to the input end of the control circuit; the drain of the third field effect transistor Q'3 is connected to the output end of the control circuit.

[0055] On the basis of the above, VCC3.3 causes the gate voltage of the first field effect transistor Q'1 to be lower than the source voltage through the third voltage-dividing resistor R'3 and the fourth voltage-dividing resistor R'4, and when the gate voltage of the first field effect transistor Q'1 is lower than the source voltage to a certain threshold voltage (VTP), the negative voltage on the gate of the first field effect transistor Q'1 will induce positive charges (holes) in the substrate, forming a P-type conductive channel, allowing current to flow from the source to the drain, thereby turning on the source and drain of the first field effect transistor Q'1. Then, through the third current limiting resistor R3, the second diode D2, the fourth current limiting resistor R4 and the fifth voltage dividing resistor R'5, the base voltage of the third triode Q3 is made greater than 0.7V, and a forward voltage is formed between the emitter and the base of the third triode Q3, so that electrons flow from the N-type region to the P-type region (base region). As the electrons flow into the base region of the third triode Q3, the base current of the third triode Q3 increases, which in turn causes the collector current of the third triode Q3 to increase, thereby achieving the conduction of the third triode Q3.

[0056] Furthermore, when the voltage at the input terminal VCC_IN+ of the control circuit passes through the seventh voltage-dividing resistor R'7 and the sixth voltage-dividing resistor R'6 so that the gate-source voltage (VGS) of the second field effect transistor Q'2 and the third field effect transistor Q'3 is greater than the threshold voltage, an electric field is generated in the silicon dioxide insulating layer between the gate and the substrate of the second field effect transistor Q'2 and the third field effect transistor Q'3. This electric field attracts free electrons in the substrate to the bottom of the gate to form an N-type conductive channel. At this time, current can flow from the source to the drain of the second field effect transistor Q'2 and the third field effect transistor Q'3, thereby making the voltage at the output terminal VCC_OUT+ of the control circuit equal to the voltage at the input terminal VCC_IN+. At this time, the output terminal VCC_OUT+ can be output to the outside, and then the secondary loop power input terminal completes the control.

[0057] Furthermore, if the voltage of the output terminal VCC_OUT+ is short-circuited, the voltage of the output terminal VCC_OUT+ is equal to 0V, and the output terminal VCC_OUT+ is divided by the fifth current-limiting resistor R5 and the eighth voltage-dividing resistor R'8, and then passes through the sixth current-limiting resistor R6, so that the base voltage of the fourth transistor Q4 cannot be greater than 0.7V, so that no electrons flow between the emitter and the collector of the fourth transistor Q4, and then the emitter and the collector of the fourth transistor Q4 cannot be turned on; at the same time, the level of the controller 100 interrupt interface MCU_INT continues to be a high level of 3.3V, and the controller 100 cannot be activated at this time, then it is judged that the output terminal VCC_OUT+ and GND have been short-circuited at this time, and if a short circuit occurs, the controller 100 can control the alarm operation. At the same time, VCC3.3 cannot make the base voltage of the first field effect transistor Q'1 greater than 0.7V through the voltage-dividing resistor and the voltage-dividing resistor, so that no electrons flow between the emitter and the collector of the first field effect transistor Q'1, so the emitter and the collector of the first field effect transistor Q'1 cannot be turned on; and then no voltage passes through the third current-limiting resistor R3, the second diode D2 and the fourth current-limiting resistor R4, so the emitter and the collector of the third triode Q3 will not be turned on; further, the emitter and the collector of the second field effect transistor Q'2 and the third field effect transistor Q'3 will not be turned on, so there is no voltage at the output terminal VCC_OUT+, thereby completing the control of the secondary loop power supply control input terminal and realizing short-circuit protection.

[0058] Furthermore, if the MCU control communication interface MCU_CON signal is 0V low level, the base voltage of the first transistor Q1 is less than 0.7V, and then no electrons flow between the emitter and the collector of the first transistor Q1, so the emitter and the collector of the first transistor Q1 cannot be turned on; therefore, there is no forward bias between the base and the emitter of the second transistor Q2, so no carriers flow through the base region, so that a cut-off state is formed between the collector and the emitter of the second transistor Q2, thereby realizing the disconnection of the second transistor Q2; at the same time, the anode voltage of the second diode D2 is pulled down to a low level of 0V through the fourth diode D4, and then through the second diode D 2 and the base voltage of the third triode Q3 after the fourth current limiting resistor R4 is less than 0.7V, so there is no electron flow between the emitter and the collector of the third triode Q3, and the emitter and the collector of the third triode Q3 cannot be turned on; then the voltage at the input terminal VCC_IN+ of the control circuit of the present application is made to pass through the seventh voltage-dividing resistor R'7 and the sixth voltage-dividing resistor R'6 so that the gate-source voltage (VGS) of the second field effect transistor Q'2 and the third field effect transistor Q'3 is less than the threshold voltage, and an electric field cannot be generated in the silicon dioxide insulating layer between the gate and the substrate, thereby forming an N-type conductive channel, and finally both of them simultaneously cause the output terminal VCC_OUT+ voltage to be a low level of 0V. After the voltage at the output terminal VCC_OUT+ is 0V low level, the output terminal VCC_OUT+ is divided by the fifth current limiting resistor R5 and the eighth voltage dividing resistor R'8, and then passes through the sixth current limiting resistor R6 to make the base voltage of the fourth transistor Q4 less than 0.7V, and then no electrons flow between the emitter and the collector of the fourth transistor Q4, and the emitter and the collector of the fourth transistor Q4 cannot be turned on; and then the level of the controller 100 interrupt interface MCU_INT changes from 0V low level to 3.3V high level, and then the controller 100 determines that the secondary loop power control is in the shutdown process at this time, and then completes the shutdown control of the secondary loop power control.

[0059] It should be noted that the field effect transistor in this application is a MOS transistor.

[0060] In summary, the present application not only realizes the switch control of the secondary circuit power supply control, but also realizes the detection of the short circuit of the output end of the secondary circuit power supply control, and can perform short circuit alarm processing through the controller. In addition, the present application also realizes that if a short circuit occurs at the output end, there will be no current output, thereby realizing short circuit protection of the circuit.

[0061] Furthermore, the present application also proposes an electric vehicle, comprising the above-mentioned electric vehicle secondary loop power supply control circuit.

[0062] The above description is only a specific implementation manner of the present application, but the protection scope of the present application is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application.

Claims

1. An electric vehicle circuit power supply control circuit, characterized in that: include: Controller, input and output module and short circuit determination module; The controller is connected to the input-output module via a communication interface, and is used to control the output of the input-output module signal by controlling the signal of the communication interface; The short circuit determination module is connected to the input-output module and is used to determine the port voltage of the interrupt interface of the controller through the output voltage of the input-output module; The controller is also used to determine whether a short circuit occurs at the output end of the circuit by detecting the interrupt interface voltage.

2. The electric vehicle sub-loop power supply control circuit according to claim 1, characterized in that: The input-output module includes a first drive switch circuit, a first transistor, a second drive switch circuit, a second transistor, a power supply, a third drive switch circuit, a first field effect transistor, a fourth drive switch circuit, a third transistor and an output conduction circuit; One end of the first driving switch circuit is connected to the communication interface, and the other end is connected to the first transistor; one end of the second driving switch circuit is connected to the first transistor, and the other end is connected to the second transistor; One end of the third driving switch circuit is connected to the connection line between the power supply and the first end of the first field effect transistor; the other end of the third driving switch circuit is connected to the second end of the first field effect transistor; The third end of the first field effect transistor is connected to the fourth drive switch circuit; the other end of the fourth drive switch circuit is connected to one end of the third transistor; the other end of the third transistor is connected to one end of the output conduction circuit; the second end of the output conduction circuit is connected to the input end of the control circuit; the third end of the output conduction circuit is connected to the output end of the control circuit.

3. The electric vehicle sub-loop power supply control circuit according to claim 2 is characterized in that: The short circuit determination module includes a fifth drive switch circuit and a fourth transistor; One end of the fifth driving switch circuit is connected to the output end of the control circuit; the other end of the fifth driving switch circuit is connected to the fourth transistor; the other end of the fourth transistor is connected to the input-output module; The interrupt interface is connected to the connection line between the fourth transistor and the input-output module.

4. The electric vehicle sub-loop power supply control circuit according to claim 2, characterized in that: The first driving switch circuit includes a first diode, a first current limiting resistor and a first voltage dividing resistor; The anode of the first diode is connected to the communication interface; the cathode of the first diode is connected to one end of the first current limiting resistor; the other end of the first current limiting resistor is connected to the base end of the first transistor; the collector end of the first transistor is connected to the second drive switch circuit; The emitter terminal of the first triode is grounded; One end of the first voltage-dividing resistor is connected to the connection line between the first current-limiting resistor and the first transistor; the other end of the first voltage-dividing resistor is connected to the line where the emitter terminal of the first transistor is grounded.

5. The electric vehicle sub-loop power supply control circuit according to claim 2, characterized in that: The second driving switch circuit includes a second current limiting resistor and a second voltage dividing resistor; One end of the second current limiting resistor is connected to the first transistor; the other end of the second current limiting resistor is connected to the base terminal of the second transistor; One end of the second voltage-dividing resistor is connected to the line connecting the second current-limiting resistor and the second transistor; the other end of the second voltage-dividing resistor is connected to the line connecting the input end of the control circuit and the second transistor.

6. The electric vehicle sub-loop power supply control circuit according to claim 2, characterized in that: The third driving switch circuit includes a third voltage-dividing resistor and a fourth voltage-dividing resistor; One end of the fourth voltage-dividing resistor is connected to the short-circuit determination module; the other end of the fourth voltage-dividing resistor is connected to the third voltage-dividing resistor; the other end of the third voltage-dividing resistor is connected to the connecting line connected to the power supply and the source of the first field effect transistor; the gate of the first field effect transistor is connected to the connecting line between the third voltage-dividing resistor and the fourth voltage-dividing resistor; the drain of the first field effect transistor is connected to the fourth drive switch circuit.

7. The electric vehicle sub-loop power supply control circuit according to claim 2, characterized in that: The fourth driving switch circuit includes a third current limiting resistor, a second diode, a fourth current limiting resistor and a fifth voltage dividing resistor; One end of the third current limiting resistor is connected to the first field effect transistor; the other end of the third current limiting resistor is connected to the anode of the second diode; the cathode of the second diode is connected to the fourth current limiting resistor; the other end of the fourth current limiting resistor is connected to the base of the third transistor; the emitter of the third transistor is grounded; the collector of the third transistor is connected to the output conduction circuit; one end of the fifth voltage dividing resistor is connected to the ground wire of the collector of the third transistor, and the other end of the fifth voltage dividing resistor is connected to the connecting wire between the fourth current limiting resistor and the third transistor.

8. The electric vehicle sub-loop power supply control circuit according to claim 2, characterized in that: The output conduction circuit includes a sixth voltage-dividing resistor, a seventh voltage-dividing resistor, a second field-effect transistor and a third field-effect transistor; One end of the sixth voltage-dividing resistor is connected to the third triode; the other end of the sixth voltage-dividing resistor is connected to the seventh voltage-dividing resistor; the other end of the seventh voltage-dividing resistor is connected to the connection line between the second field effect transistor and the third field effect transistor; The gate of the second field effect transistor and the gate of the third field effect transistor are both connected to the connecting line of the sixth voltage-dividing resistor and the seventh voltage-dividing resistor; the drain of the second field effect transistor is connected to the input end of the control circuit; and the drain of the third field effect transistor is connected to the output end of the control circuit.

9. The electric vehicle sub-loop power supply control circuit according to claim 3, characterized in that: The fifth driving switch circuit includes a fifth current limiting resistor, an eighth voltage dividing resistor and a sixth current limiting resistor; One end of the fifth current-limiting resistor is connected to the output end of the control circuit; the other end is connected to the eighth voltage-dividing resistor; one end of the sixth current-limiting resistor is connected to the connection line between the fifth current-limiting resistor and the eighth voltage-dividing resistor; the other end of the sixth current-limiting resistor is connected to the base of the fourth triode; the emitter of the fourth triode is grounded; one end of the eighth voltage-dividing resistor is connected to the ground line of the emitter of the fourth triode; the collector of the fourth triode is connected to the third driving switch circuit; The interrupt interface is connected to a connection line between the fourth transistor and the third driving switch circuit.

10. An electric vehicle, characterized in that: include: An electric vehicle sub-loop power supply control circuit as described in any one of claims 1 to 9.

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