Boost circuit, electronic control system and vehicle

Abstract

The invention relates to a booster circuit, an electronic control system and a vehicle. The boost circuit is applied to the electric vehicle and comprises an input voltage end, an overcurrent protection module, a boost module, a frequency generation module, a voltage control module and an output voltage end. The input voltage end, the overcurrent protection module, the boosting module and the output voltage end are connected in sequence; the overcurrent protection module comprises a current sampling circuit; the current sampling circuit comprises a filter capacitor and a sampling resistor which are connected in parallel, and the filter capacitor is configured to have a preset filter capacitance value, so that the overcurrent protection module controls the output of the voltage control module to stop under the condition of continuous overcurrent; the voltage control module is respectively connected with the overcurrent protection module, the boosting module and the output voltage end; the frequency generation module is connected with the voltage control module. According to the invention, the boost effect which is the same as that of a special boost chip can be realized without using a special chip, so that the manufacturing cost is reduced.

Description

Technical Field

[0001] The present invention relates to the automotive field, and in particular to a boost circuit, device, system and storage medium. Background Art

[0002] With the development of science and technology, the popularity of electronic products is increasing, and many traditional mechanical products are gradually becoming electronic. A typical example is the car. Traditional cars are composed of mechanical structural components. However, now cars are usually composed of hundreds of electronic control units. For example, the engine electronic control system is responsible for the ignition and fuel injection of the engine, the electronic stability system is responsible for the braking, anti-lock, and parking of the car, and the electronic steering system provides steering assistance, etc. For automotive electronic products, all loads are basically controlled by MOS (metal oxide semi-conductor field effect transistor, MOSFET), and the control methods are divided into high-end (HS) and low-end (LS) drives, and the high-end drive control source needs to be realized through a boost circuit.

[0003] Existing boost circuit solutions basically use charge pumps or boost circuits for boosting. Although the charge pump boost circuit has the ability to boost, its driving capability is generally at the milliampere level and requires a dedicated charge pump driver chip. The boost circuit also needs to be controlled by a proprietary chip, resulting in high costs. Summary of the invention

[0004] The embodiments of the present application provide a boost circuit, an electronic control system and a vehicle, which can achieve the same boost effect as a proprietary boost chip without using a proprietary chip, thereby reducing manufacturing costs.

[0005] On the one hand, the present application provides a boost circuit, which is applied to electric vehicles, and the circuit includes an input voltage terminal, an overcurrent protection module, a boost module, a frequency generation module, a voltage control module, and an output voltage terminal. The input voltage terminal, the overcurrent protection module, the boost module, and the output voltage terminal are connected in sequence; the overcurrent protection module includes a current sampling circuit; the current sampling circuit includes a filter capacitor and a sampling resistor in parallel, and the filter capacitor is configured to have a preset filter capacitance value, so that the overcurrent protection module controls the output of the voltage control module to stop in the case of continuous overcurrent; the voltage control module is respectively connected to the overcurrent protection module, the boost module, and the output voltage terminal; the frequency generation module is connected to the voltage control module.

[0006] Optionally, the boost module includes an energy storage inductor, a switching tube, a rectifier diode and a charging capacitor; the energy storage inductor is connected to the rectifier diode; the first end of the switching tube is connected to the connection node between the energy storage inductor and the rectifier diode, the second end is grounded, and the third end is connected to the voltage control module; the charging capacitor is connected to one end of the rectifier diode away from the energy storage inductor; and the end of the charging capacitor away from the rectifier diode is grounded.

[0007] Optionally, the overcurrent protection module includes a current sampling circuit, an overcurrent protection voltage regulator, an overcurrent protection driving tube, an overcurrent protection driving tube, a voltage divider circuit, an overcurrent clamping tube, and an overcurrent protection capacitor; one end of the overcurrent protection voltage regulator is connected to the input voltage end and the end of the current sampling circuit close to the input voltage end, and the other end is connected to the overcurrent protection driving tube; the first end of the overcurrent protection driving tube is connected to the current sampling circuit, the second end is connected to the overcurrent protection voltage regulator, and the third end is connected to the voltage divider circuit; the preset point of the voltage divider circuit is connected to the first end of the overcurrent clamping tube; the first end of the overcurrent clamping tube is connected to the preset point of the voltage divider circuit and is grounded via the overcurrent protection capacitor, the second end is grounded, and the third end is connected to the voltage control module.

[0008] Optionally, the voltage-dividing circuit includes a first voltage-dividing resistor and a second voltage-dividing resistor connected to each other; and a preset potential of the voltage-dividing circuit is a connection point between the first voltage-dividing resistor and the second voltage-dividing resistor.

[0009] Optionally, the output frequency of the frequency generating module is the switching frequency of the switching tube; the frequency generating module includes an oscillation capacitor and an oscillation resistor in parallel, and a Schmidt inverter; one end of the oscillation capacitor is grounded, and the other end is connected to the oscillation resistor and the first connection node of the Schmidt inverter.

[0010] Optionally, the voltage control module includes a voltage detection circuit, an inverter, an AND gate, a current limiting resistor and a static bias resistor. One end of the voltage detection circuit is connected to the output voltage end, and the other end is grounded; one end of the inverter is connected to a preset point of the voltage detection circuit, and the other end is connected to the input end of the AND gate; the oscillation resistor and the second connection node of the Schmitt inverter are respectively connected to the input end of the AND gate; one end of the current limiting resistor is connected to the output end of the AND gate, and the other end is connected to the third end of the switch tube; one end of the static bias resistor is connected to the second end of the switch tube, and the other end is connected to the third end of the overcurrent clamp tube.

[0011] Optionally, the voltage detection circuit includes a connected voltage detection voltage regulator tube and a voltage detection resistor; the preset point of the voltage detection circuit is the connection point of the voltage detection voltage regulator tube and the voltage detection resistor.

[0012] Optionally, the preset filter capacitance is determined based on a current protection threshold of a continuous overcurrent.

[0013] On the other hand, the present application provides an electronic control system, comprising the above-mentioned boost circuit.

[0014] On the other hand, the present application provides a vehicle, comprising the above-mentioned boost circuit.

[0015] The boost circuit, electronic control system and vehicle provided by the embodiments of the present application have the following beneficial effects:

[0016] (1) By simplifying and improving the Boost circuit, the driving capability can reach the ampere level without the need for a dedicated boost chip. Therefore, the performance can meet the driving requirements of the vehicle's multi-channel high-end drive system while keeping the cost low.

[0017] (2) The overcurrent protection module protects against high current startup, and the voltage control module controls the output voltage, thereby improving the stability and safety of the drive system. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative work.

[0019] Figure 1 This is a schematic diagram of an application scenario of a boost circuit provided in an embodiment of the present application;

[0020] Figure 2 is a schematic structural diagram of a boost circuit provided in an embodiment of the present application;

[0021] Figure 3 It is a structural schematic diagram of a boost circuit provided in an embodiment of the present application. DETAILED DESCRIPTION

[0022] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0023] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present application described here can be implemented in an order other than those illustrated or described here. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a structure, system, product or server including a series of units is not necessarily limited to the units clearly listed, but may include other or units that are not clearly listed or inherent to these products or devices. In the absence of further restrictions, the elements defined by the statement "including one..." do not exclude the existence of other identical elements in the process, method, article or device including the elements. In the description of the operation of the present invention, it is also necessary to understand that "proximal end" and "distal end" represent the distance from the operator, respectively, and "up", "down", "left" and "right" correspond to the relative position of the structure in the corresponding diagram, respectively.

[0024] Unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0025] In the automotive field, cars are usually composed of hundreds of electronic control units. For automotive electronic products, all loads are basically controlled by MOS (metal oxide semiconductor field effect transistor, MOSFET), and the control methods are divided into high-end (HS) and low-end (LS) drive, and the high-end drive control source needs to be realized through a boost circuit. The existing boost circuit solutions basically use charge pumps or boost circuits for boosting. Although the charge pump boost circuit has the ability to boost, the driving capacity is generally at the milliampere level, and a dedicated charge pump driver chip is required. The boost circuit also needs to be controlled by a proprietary chip, resulting in higher costs.

[0026] A boost circuit provided in the present application can achieve a driving capability of the ampere level by simplifying and improving the Boost boost circuit without the need for a dedicated boost chip. Therefore, while the cost is low, the performance can meet the driving requirements of a vehicle's multi-channel high-end drive system.

[0027] The following is a specific embodiment of a boost circuit provided by the present application. Figure 1 , Figure 1Schematic diagram of an application scenario of a boost circuit provided in an embodiment of the present application. Figure 1 As shown, the vehicle 101 and one or more sensors 1011 and one or more controllers 1012 included in the vehicle 101 are included.

[0028] Optionally, the vehicle 101 may include a sensor 1011 for sensing the surrounding environment. The sensor 1011 may include one or more of the following sensors: an ultrasonic sensor, a millimeter wave radar, a laser radar (LiDAR), a visual camera, and an infrared camera. The sensor 1011 may capture the situation inside and outside the vehicle in real time and collect corresponding perception data.

[0029] Optionally, the vehicle 101 may include a controller 1012. The controller 1012 may include a processor that communicates with various types of computer-readable storage devices or media, such as a central processing unit (CPU) or a graphics processing unit (GPU), or other dedicated processors, etc. The computer-readable storage device or medium may include any non-transitory storage device, which may be any storage device that is non-transitory and can achieve data storage, and may include but is not limited to a disk drive, an optical storage device, a solid-state memory, a floppy disk, a flexible disk, a hard disk, a tape, or any other magnetic medium, an optical disk or any other optical medium, a read-only memory (ROM), a random access memory (RAM), a cache memory, and / or any other memory chip or box, and / or any other medium from which a computer can read data, instructions, and / or code. Some of the data in the computer-readable storage device or medium represents executable instructions used by the controller 1012 to control the vehicle. The controller 1012 may include an autonomous driving system for automatically controlling various actuators in the vehicle.

[0030] In addition, it should be noted that Figure 1 The above is only an application environment of a boost circuit provided by the present disclosure. In practical applications, other application environments may also be included. This embodiment does not limit this. The vehicle disclosed in the present disclosure may include Figure 1 One or more of the structures or functions of the vehicle 101 shown.

[0031] The following is based on Figure 2 The specific structure of a boost circuit provided by the present application is introduced. The boost circuit can be applied to electric vehicles.

[0032] like Figure 2 As shown in the figure, the boost circuit may specifically include an input voltage terminal 201 , an overcurrent protection module 202 , a boost module 203 , a frequency generation module 204 , a voltage control module 205 , and an output voltage terminal 206 .

[0033] according to Figure 2 As shown in the figure, the input voltage terminal 201, the overcurrent protection module 202, the boost module 203 and the output voltage terminal 206 are connected in sequence; the voltage control module 205 is respectively connected to the overcurrent protection module 202, the boost module 203, and the output voltage terminal 206; and the frequency generation module 204 is connected to the voltage control module 205.

[0034] Optionally, the overcurrent protection module 202 may include a current sampling circuit. The current sampling circuit may include a filter capacitor and a sampling resistor connected in parallel. Optionally, the filter capacitor is configured to have a preset filter capacitance value so that the overcurrent protection module 202 controls the output of the voltage control module 205 to stop in the case of continuous overcurrent.

[0035] Optionally, the preset filter capacitance is determined based on a current protection threshold of a continuous overcurrent.

[0036] The following is based on Figure 3 The present application further introduces a boost module 203 in a boost circuit.

[0037] As an example, Figure 3 As shown, the boost module 203 may include an energy storage inductor L, a switch tube Q3 , a rectifier diode D2 and a charging capacitor C4 .

[0038] The energy storage inductor L is connected to the rectifier diode D2. The first end of the switch tube Q3 is connected to the connection node between the energy storage inductor L and the rectifier diode D2, the second end is grounded, and the third end is connected to the voltage control module 205.

[0039] The charging capacitor C4 is connected to an end of the rectifier diode D2 away from the energy storage inductor L. An end of the charging capacitor C4 away from the rectifier diode D2 is grounded.

[0040] The boost module 203 in a boost circuit of an embodiment of the present application can realize the increase of input voltage. When the switch tube Q3 is closed, the current stores energy in the energy storage inductor L; when the switch tube Q3 is closed, the energy storage inductor L discharges the energy storage capacitor C4 through the rectifier diode D2, and the voltage across the energy storage capacitor C4 increases. At this time, the voltage across the energy storage capacitor C4 is higher than the input voltage of the input voltage terminal 201.

[0041] The increase in the current of the energy storage inductor L during the conduction period of the switch tube Q3 is equal to the decrease in the energy storage inductor L during the turn-off period of the switch tube Q3. Based on this, the following formula can be obtained:

[0042] VIN*Don / (f*L)=(Vout+Vd2-VIN)*Don / (f*L),

[0043] Among them, f is the switching frequency of the switch tube Q3, Don is the PWM duty cycle of the switch tube Q3, VIN is the input voltage of the input voltage terminal 201, Vout is the output voltage of the output voltage terminal 206, L is the inductance value of the energy storage inductor L, and Vd2 is the voltage regulation value of the rectifier diode D2.

[0044] Based on the above formula, the output voltage, output current and output current ripple can be obtained.

[0045] Output voltage:

[0046] Vout = 2 * VIN - VD2,

[0047] Output Current:

[0048] Iout=2*C4*f*Vpp,

[0049] Output current ripple:

[0050] △I=VIN*0.5 / (L*f).

[0051] Wherein, Vpp is the output ripple of the output voltage Vout.

[0052] In an optional implementation, the input voltage of the input voltage terminal 201 can be set to 12V, the input current can be 500mA, the voltage ripple can be less than 50mV, the current ripple can be less than 50mA, the value of the charging capacitor C4 can be 12.5uF, and the value of the energy storage inductor L can be 300uH.

[0053] It should be noted that the embodiment of the present application does not limit the selection and values ​​of the components of the boost module 203. In some other optional implementations, the devices may also be devices with other values ​​and other models.

[0054] The following is based on Figure 3 The present application further introduces an overcurrent protection module 202 in a boost circuit.

[0055] As an example, Figure 3 As shown in the figure, the overcurrent protection module 202 may include a current sampling circuit, an overcurrent protection voltage regulator D1, an overcurrent protection driving tube Q1, a voltage divider circuit, an overcurrent clamping tube Q2, and an overcurrent protection capacitor C2.

[0056] Optionally, the current sampling circuit may include a filter capacitor C1 and a sampling resistor R1 connected in parallel. Optionally, the filter capacitor C1 is configured to have a preset filter capacitance value, so that the overcurrent protection module 202 controls the output of the voltage control module 205 to stop in the case of continuous overcurrent, thereby avoiding false start of a large current at a normal frequency.

[0057] One end of the overcurrent protection voltage regulator D1 is connected to the input voltage terminal 201 and one end of the current sampling circuit close to the input voltage terminal 201, and the other end is connected to the overcurrent protection driving tube Q1.

[0058] The first end of the overcurrent protection driving tube Q1 is connected to the current sampling circuit, the second end is connected to the overcurrent protection voltage regulator tube D1, and the third end is connected to the voltage dividing circuit.

[0059] The preset point of the voltage divider circuit is connected to the first end of the overcurrent clamp tube. The first end of the overcurrent clamp tube Q2 is connected to the preset point of the voltage divider circuit and grounded via the overcurrent protection capacitor C2, the second end is grounded, and the third end is connected to the voltage control module 205.

[0060] Optionally, the voltage-dividing circuit includes a first voltage-dividing resistor R2 and a second voltage-dividing resistor R3 connected to each other, and the preset potential of the voltage-dividing circuit is a connection point between the first voltage-dividing resistor R2 and the second voltage-dividing resistor R3.

[0061] In an optional implementation, the resistance values ​​of the first voltage-dividing resistor R2 and the second voltage-dividing resistor R3 may be preset resistance values. Optionally, (Vin-Vd1)*R3 / (R3+R2) may be controlled to be greater than or equal to 0.7. Optionally, the first voltage-dividing resistor R2 and the second voltage-dividing resistor R3 may be set to be 10kΩ resistors. The minimum input voltage of Vin is limited to 2.85V.

[0062] During the operation of the overcurrent protection module 202, when the voltage across the sampling resistor R1 increases to a voltage exceeding the voltage of the overcurrent protection voltage regulator D1, the overcurrent protection driving tube Q1 can be turned on. In addition, due to the voltage-dividing effect of the first voltage-dividing resistor R2 and the second voltage-dividing resistor R3, the overcurrent clamping tube Q2 is turned on, so that the voltage across the static bias resistor R4 reaches 0.7V, which is lower than the turn-on voltage of the switch tube Q3. Therefore, the switch tube Q3 is turned off, so that the boost module 203 stops working.

[0063] Optionally, the overcurrent protection parameter can be set by setting the voltage stabilization value of the overcurrent protection voltage regulator D1. The overcurrent protection value is Imax=Vd1 / R1, where Vd1 is the voltage stabilization value of D1. Optionally, the overcurrent protection value Imax can be set to 1A, Vd1 can be set to 2.5V, and the resistance value of the sampling resistor R1 can be set to 2.5Ω.

[0064] It should be noted that the embodiment of the present application does not limit the selection and values ​​of the components of the overcurrent protection module 202. In some other optional implementations, the devices may also be devices with other values ​​and other models.

[0065] In the embodiment of the present application, the overcurrent protection module 202 can protect against false start-up due to large current, thereby further ensuring the safety and stability of the vehicle's high-voltage drive.

[0066] The following is based on Figure 3 The frequency generation module 204 in a voltage boost circuit provided by the present application is further introduced.

[0067] As an example, Figure 3 As shown, the frequency generation module 204 includes an oscillation capacitor C3, an oscillation resistor R6 and a Schmidt inverter U1 connected in parallel. In other words, the frequency generation module 204 includes an oscillation circuit composed of the oscillation capacitor C3, the oscillation resistor R6 and the Schmidt inverter U1.

[0068] One end of the oscillation capacitor C3 is grounded, and the other end is connected to the oscillation resistor R6 and the first connection node of the Schmidt inverter U1.

[0069] The output frequency of the frequency generating module 204 in the embodiment of the present application is the switching frequency of the switch tube Q3. Optionally, the output frequency of the Schmidt inverter U1 is f=1 / (C3*R6), that is, the switching frequency of the switch tube Q3, and the output duty cycle Don is 50%. Wherein, R6 in the formula is the resistance value of the oscillation resistor R6. Optionally, the output frequency of the Schmidt inverter U1 can be set to 400kHz to reduce radiation. Optionally, the capacitance of the oscillation capacitor C3 can be 100nF, and the resistance value of the oscillation resistor R6 can be 25kΩ.

[0070] It should be noted that the embodiment of the present application does not limit the selection and values ​​of the components of the frequency generation module 204. In some other optional implementations, the components may also be components with other values ​​and other models.

[0071] The following is based on Figure 3 The voltage control module 205 in a boost circuit provided by the present application is further introduced.

[0072] As an example, Figure 3 As shown, the voltage control module 205 may include a voltage detection circuit, an inverter U3 , an AND gate U2 , a current limiting resistor R5 , and a static bias resistor R4 .

[0073] One end of the voltage detection circuit is connected to the output voltage terminal 206 , and the other end is grounded.

[0074] One end of the inverter U3 is connected to the preset point of the voltage detection circuit, and the other end is connected to the input end of the AND gate U2. In addition, the oscillation resistor R6 of the frequency generation module 204 and the second connection node of the Schmidt inverter U1 are also connected to the input end of the AND gate U2.

[0075] One end of the current limiting resistor R5 is connected to the output end of the AND gate U2, and the other end is connected to the third end of the switch tube Q3.

[0076] One end of the static bias resistor R4 is connected to the second end of the switch tube Q3 , and the other end is connected to the third end of the overcurrent clamp tube Q2 of the overcurrent protection module 202 .

[0077] Optionally, the voltage detection circuit includes a voltage detection voltage regulator tube D3 and a voltage detection resistor R7 connected to each other. Optionally, the preset point of the voltage detection circuit is the connection point of the voltage detection voltage regulator tube D3 and the voltage detection resistor R7.

[0078] Optionally, the resistance value of the current limiting resistor R5 may be 1 kΩ, and the resistance value of the bias resistor R4 may be 10 kΩ.

[0079] The voltage detection circuit of the embodiment of the present application can control the boost module 203 to stop working when the voltage of the output voltage terminal 206 is too high, thereby controlling the voltage of the output terminal. When the output voltage Vout of the output voltage terminal 206 exceeds the voltage of the voltage detection voltage regulator tube D3, the current flowing through the voltage detection resistor R7 can make the voltage across the voltage detection resistor R7 reach the reverse voltage of the inverter U3, so that the inverter U3 outputs a low level. Since a low level is input to the input end of the AND gate U2, the output end of the AND gate U2 is also a low level, thereby shielding the output of the frequency generation module 204, and prohibiting the switch tube Q3 from being turned on, so that the boost module 203 also stops working.

[0080] On the contrary, when the output voltage Vout of the output voltage terminal 206 is lower than the voltage of the voltage detection voltage regulator D3, the circuit in the boost module 203 can work normally.

[0081] Optionally, in a steady state, the output voltage Vout of the output voltage terminal 206 may be equal to the regulated voltage value Vd3 of the voltage detection zener diode D3.

[0082] Optionally, Vout-Vd3 can be greater than or equal to 1.4V, or the reverse stabilization current Iz of the voltage detection voltage regulator D3 can be greater than 1.4V / R7. Optionally, when the input voltage of the input voltage terminal 201 is 12V, the output voltage of the output voltage terminal 206 can be 18V, the stabilization value of the voltage detection voltage regulator D3 can be 16.6V, and the voltage detection resistor R7 can be 280Ω.

[0083] It should be noted that the embodiment of the present application does not limit the selection and values ​​of the components of the voltage control module 205. In some other optional implementations, the components may also be components with other values ​​and other models.

[0084] In the embodiment of the present application, the voltage control module 205 can control the output voltage of the output voltage terminal 206 to ensure that the output voltage is the voltage value required by the drive system, thereby further ensuring the safety and stability of the vehicle high-voltage drive.

[0085] A boost circuit provided in an embodiment of the present application can achieve a driving capability of the ampere level without the need for a dedicated boost chip by simplifying and improving the Boost boost circuit. Therefore, while the cost is low, the performance can meet the driving requirements of a vehicle's multi-channel high-end drive system.

[0086] Accordingly, the present application provides an electronic control system, comprising the above-mentioned boost circuit.

[0087] Accordingly, the present application provides a vehicle, comprising the above-mentioned boost circuit. As an example, the vehicle may be as follows Figure 1 The vehicle shown.

[0088] It should be noted that multiple embodiments provided in this application are based on the same inventive concept.

[0089] Finally, it should be pointed out that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that the above are only preferred embodiments of the present application and are not used to limit the present application. Within the spirit and principle of the present application, the technical solutions described in the above embodiments can still be modified, or some of the technical features can be replaced by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

[0090] The above description is only a specific implementation of the present application, so that those skilled in the art can understand or implement the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest range consistent with the principles and novel features applied for herein.

Claims

1. A boost circuit, characterized in that: Applied to electric vehicles, the circuit includes an input voltage terminal, an overcurrent protection module, a boost module, a frequency generation module, a voltage control module, and an output voltage terminal; The input voltage terminal, the overcurrent protection module, the boost module and the output voltage terminal are connected in sequence; The overcurrent protection module includes a current sampling circuit; the current sampling circuit includes a filter capacitor and a sampling resistor connected in parallel, and the filter capacitor is configured to have a preset filter capacitance value, so that the overcurrent protection module controls the output of the voltage control module to be terminated in the case of continuous overcurrent; The voltage control module is respectively connected to the overcurrent protection module, the boost module, and the output voltage terminal; The frequency generation module is connected to the voltage control module.

2. A boost circuit according to claim 1, characterized in that: The boost module includes an energy storage inductor, a switch tube, a rectifier diode and a charging capacitor; The energy storage inductor is connected to the rectifier diode; The first end of the switch tube is connected to the connection node between the energy storage inductor and the rectifier diode, the second end is grounded, and the third end is connected to the voltage control module; The charging capacitor is connected to one end of the rectifier diode away from the energy storage inductor; and one end of the charging capacitor away from the rectifier diode is grounded.

3. A boost circuit according to claim 2, characterized in that: The overcurrent protection module includes the current sampling circuit, the overcurrent protection voltage regulator, the overcurrent protection drive tube, the overcurrent protection drive tube, the voltage divider circuit, the overcurrent clamp tube, and the overcurrent protection capacitor; One end of the overcurrent protection voltage regulator is connected to the input voltage terminal and one end of the current sampling circuit close to the input voltage terminal, and the other end is connected to the overcurrent protection driving tube; The first end of the overcurrent protection driving tube is connected to the current sampling circuit, the second end is connected to the overcurrent protection voltage regulator tube, and the third end is connected to the voltage divider circuit; The preset point of the voltage divider circuit is connected to the first end of the overcurrent clamp tube; The first end of the overcurrent clamp tube is connected to a preset point of the voltage divider circuit and is grounded via the overcurrent protection capacitor, the second end is grounded, and the third end is connected to the voltage control module.

4. A boost circuit according to claim 3, characterized in that: The voltage dividing circuit comprises a first voltage dividing resistor and a second voltage dividing resistor connected to each other; The preset potential of the voltage-dividing circuit is a connection point between the first voltage-dividing resistor and the second voltage-dividing resistor.

5. A boost circuit according to claim 3, characterized in that: The output frequency of the frequency generating module is the switching frequency of the switch tube; The frequency generation module includes an oscillation capacitor, an oscillation resistor connected in parallel, and a Schmidt inverter; One end of the oscillation capacitor is grounded, and the other end is connected to the oscillation resistor and the first connection node of the Schmidt inverter.

6. A boost circuit according to claim 5, characterized in that: The voltage control module includes a voltage detection circuit, an inverter, an AND gate, a current limiting resistor and a static bias resistor. One end of the voltage detection circuit is connected to the output voltage end, and the other end is grounded; One end of the inverter is connected to a preset point of the voltage detection circuit, and the other end is connected to an input end of the AND gate; The second connection node of the oscillation resistor and the Schmitt inverter is connected to the input end of the AND gate; One end of the current limiting resistor is connected to the output end of the AND gate, and the other end is connected to the third end of the switch tube; One end of the static bias resistor is connected to the second end of the switch tube, and the other end is connected to the third end of the overcurrent clamp tube.

7. A boost circuit according to claim 6, characterized in that: The voltage detection circuit includes a connected voltage detection voltage regulator tube and a voltage detection resistor; The preset point of the voltage detection circuit is the connection point of the voltage detection voltage regulator tube and the voltage detection resistor.

8. A boost circuit according to claim 1, characterized in that: The preset filter capacitance is determined based on a current protection threshold of a continuous overcurrent.

9. An electronic control system, characterized in that: It comprises a boost circuit as described in claims 1-8.

10. A vehicle, characterized in that: It comprises a boost circuit as described in claims 1-8.

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