MOS ignition circuit adopting isolation driving

Abstract

The utility model discloses a metal oxide semiconductor (MOS) ignition circuit adopting isolation driving, which comprises a printed circuit board assembly (PCBA), and at least two alligator clips used for being connected with an automobile and a power supply capacitor are connected onto the PCBA. Wherein the PCBA board comprises an MCU, a power loop circuit and an auxiliary isolation power supply, the power loop circuit is connected with the auxiliary isolation power supply, the power loop circuit and the auxiliary isolation power supply are respectively connected with the MCU, and a plurality of MOS tubes are arranged in the power loop circuit. According to the MOS ignition circuit provided by the utility model, the power loop circuit and the auxiliary isolation power supply are arranged, the auxiliary isolation power supply is used for supplying power to the power loop circuit, and the ignition circuit adopts a plurality of MOS tubes as a power supply capacitor energy output switch of an automobile emergency starting power supply, so that the MOS ignition circuit has the characteristics of high speed and long repeated service life.

Description

Technical Field

[0001] The utility model relates to the technical field of ignition circuits, in particular to a MOS ignition circuit adopting isolation drive. Background Art

[0002] The car jump starter is designed to jump-start a car when it's low on battery or otherwise unable to start. To use it, wires are connected to the positive and negative terminals inside the jump starter. Motor clamps are then attached to the other ends of the wires, securing them to the car's battery. The jump starter then powers the circuit to ignite the car.

[0003] Currently, relays are generally used as ignition output switches in automotive emergency power supplies. When using this relay mode switch, the internal contacts are prone to sparking and arcing. The relay is large in size and takes up a large amount of space on the PCB control board. There is a lack of selection options for high voltage and high current, and the service life is short, requiring frequent replacement.

[0004] In view of this, it is necessary to propose further improvements to the current structure. Utility Model Content

[0005] Therefore, the present invention aims to at least partially address the deficiencies in the prior art, thereby proposing a MOS ignition circuit using an isolated drive.

[0006] In order to achieve the above purpose, a technical solution adopted by the present utility model is:

[0007] The utility model provides a MOS ignition circuit using an isolated drive, comprising a PCBA board, wherein at least two alligator clips for connecting to a car and a power supply capacitor are connected to the PCBA board;

[0008] Among them, the PCBA board includes an MCU, a power loop circuit and an auxiliary isolated power supply. The power loop circuit is connected to the auxiliary isolated power supply. The power loop circuit and the auxiliary isolated power supply are respectively connected to the MCU, and multiple MOS tubes are provided in the power loop circuit.

[0009] Furthermore, the PCBA board is also provided with a CAR+ connection position, a CAR- connection position and a CAP5+ connection position, at least two of the crocodile clips include a positive pole of the crocodile clip and a negative pole of the crocodile clip, the CAR+ connection position and the CAR- connection position are respectively connected to the positive pole of the crocodile clip and the negative pole of the crocodile clip, the CAP5+ connection position is connected to the positive pole of the power supply capacitor, and the CAR+ connection position and the CAP5+ connection position are respectively connected to the power loop circuit.

[0010] Furthermore, the multiple MOS tubes include a first MOS tube group and a second MOS tube group, the first MOS tube group and the second MOS tube group are connected in series between the positive electrode of the alligator clip connected to the CAR+ connection position and the positive electrode of the power supply capacitor, and the S pole of the first MOS tube group and the S pole of the second MOS tube group are connected.

[0011] Furthermore, the MCU includes an ISO_EN terminal, and the auxiliary isolated power supply is connected to the ISO_EN terminal. When the ISO_EN terminal outputs a low level, the auxiliary isolated power supply is turned off. When the ISO_EN terminal outputs a high level, the auxiliary isolated power supply is turned on to generate isolated ISO_12V and ISO_GND and power the power loop circuit.

[0012] Furthermore, the power loop circuit is connected to the positive and negative electrodes of the power supply capacitor, and is also connected to the positive and negative electrodes of the crocodile clip, and the MCU also includes a MosSwOn terminal, a VDD terminal, and a DG terminal. The power loop circuit is also connected to the MosSwOn terminal, the VDD terminal, and the DG terminal of the MCU. The power loop circuit also includes an isolation driver IC, and the isolation driver IC is connected to the auxiliary isolation power supply. The isolation driver IC is also connected to the first MOS tube group and the second MOS tube group.

[0013] Furthermore, the power loop circuit further includes a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor, a ninth resistor, a tenth resistor, an eleventh resistor, a twelfth resistor, a thirteenth resistor, a first MOS transistor, a first diode, a first voltage-stabilizing diode, a second voltage-stabilizing diode, a first capacitor, a second capacitor, a third capacitor, a fourth capacitor, and a fifth capacitor;

[0014] The MosSwOn terminal of the MCU is connected to the first resistor, the first resistor is connected to the first capacitor, the second resistor, and the G terminal of the first MOS tube, the first capacitor is connected to the second resistor and the DG terminal, the second resistor is connected to the DG terminal and the S terminal of the first MOS tube, the D terminal of the first MOS tube is connected to the third resistor, and the third resistor is connected to the isolation driver IC;

[0015] The isolation driver IC is further connected to the fourth resistor, the ISO_GND, the first MOS tube group, the second MOS tube group, the first voltage regulator diode, the fifth resistor, the second capacitor, the third capacitor, the sixth resistor, the seventh resistor, the fourth capacitor, the fifth capacitor, and ISO_12V;

[0016] The fourth resistor is connected to the VDD terminal;

[0017] The seventh resistor is connected to the first diode, the first diode, the third capacitor, and the sixth resistor are connected to each other, and are respectively connected to the eighth resistor, the second capacitor, the ninth resistor, the second voltage regulator diode, the first diode, the fifth resistor, the first MOS transistor group, the second MOS transistor group, the tenth resistor, the eleventh resistor, the twelfth resistor, and the thirteenth resistor;

[0018] The fourth capacitor and the fifth capacitor are connected to each other, and are also connected to the ISO_GND and the ISO_12V;

[0019] The D-pole of the first MOS transistor group is connected to the CAP5+ connection bit, and the D-pole of the second MOS transistor group is connected to the CAR+ connection bit.

[0020] Furthermore, the isolation driver IC includes a CATHODE terminal, an NC terminal, an ANODE terminal, a VEE terminal, a VOUT terminal and a VCC terminal, the CATHODE terminal is connected to the third resistor, the ANODE terminal is connected to the fourth resistor, the VEE terminal is connected to the ISO_GND, the first MOS tube group, the second MOS tube group, the first voltage regulator diode, the fifth resistor, and the second capacitor, the VOUT terminal is connected to the third capacitor, the sixth resistor, and the seventh resistor, and the VCC terminal is connected to the fourth capacitor, the fifth capacitor and the ISO_12V.

[0021] Furthermore, the first MOS transistor group includes a first discharge MOS transistor, a second discharge MOS transistor, and a third discharge MOS transistor. The G electrode of the first discharge MOS transistor is connected to the thirteenth resistor, the D electrode is connected to the CAP5+ connection point, the D electrode of the second discharge MOS transistor, and the D electrode of the third discharge MOS transistor, and the S electrode is connected to the S electrode of the second MOS transistor group, the S electrode of the second discharge MOS transistor, and the S electrode of the third discharge MOS transistor; the G electrode of the second discharge MOS transistor is connected to the twelfth resistor, the D electrode is connected to the CAP5+ connection point and the D electrode of the third discharge MOS transistor, and the S electrode is connected to the S electrode of the second MOS transistor group and the S electrode of the third discharge MOS transistor; the G electrode of the third discharge MOS transistor is connected to the ninth resistor, the D electrode is connected to the CAP5+ connection point, and the S electrode is connected to the S electrode of the second MOS transistor group.

[0022] Furthermore, the second MOS transistor group includes a first backflow prevention MOS transistor, a second backflow prevention MOS transistor, and a third backflow prevention MOS transistor. The G electrode of the first backflow prevention MOS transistor is connected to the eleventh resistor, the D electrode is connected to the CAR+ connection bit, the D electrode of the second backflow prevention MOS transistor, and the D electrode of the third backflow prevention MOS transistor, and the S electrode is connected to the S electrodes of the second and third backflow prevention MOS transistors, as well as the S electrodes of the first, second, and third discharge MOS transistors. The G electrode of the second backflow prevention MOS transistor is connected to the tenth resistor, the D electrode is connected to the CAR+ connection bit and the D electrode of the third backflow prevention MOS transistor, and the S electrode is connected to the S electrode of the third backflow prevention MOS transistor and the S electrodes of the first, second, and third discharge MOS transistors. The G electrode of the third backflow prevention MOS transistor is connected to the fifth resistor, the D electrode is connected to the CAR+ connection bit, and the S electrode is connected to the S electrodes of the first, second, and third discharge MOS transistors.

[0023] Furthermore, the auxiliary isolated power supply includes a fourteenth resistor, a fifteenth resistor, a sixteenth resistor, a seventeenth resistor, an eighteenth resistor, a sixth capacitor, a seventh capacitor, an eighth capacitor, a ninth capacitor, a tenth capacitor, an eleventh capacitor, a twelfth capacitor, a third voltage-stabilizing diode, a second diode, a third diode, a transformer, a power supply and a power supply chip, the power supply chip including a VIN terminal, an EN / UVLO terminal, a GND terminal, an RFB terminal and a SW terminal, the ISO_EN is connected to the fourteenth resistor and the EN / UVLO terminal, the fourteenth resistor is connected to the GND terminal and grounded, the VIN terminal is connected to the sixth capacitor, the seventh capacitor, the power supply and the eighth capacitor, the third voltage-stabilizing diode, and the input terminal of the transformer, the sixth capacitor and the seventh capacitor are interconnected and grounded, the RFB terminal is connected to the ninth capacitor and the tenth capacitor. The fifth resistor is further connected to the ninth capacitor, the fifteenth resistor is further connected to the sixteenth resistor, the sixteenth resistor is connected to the input end of the transformer, the second diode, and the SW end, the second diode is further connected to the eighth capacitor and the third voltage-stabilizing diode, the output end of the transformer is further connected to the seventeenth resistor, the third diode, the eighteenth resistor, the tenth capacitor, the eleventh capacitor, and the ISO_GND, the seventeenth resistor is further connected to the third diode and the twelfth capacitor, the twelfth capacitor is further connected to the second diode, the eighteenth resistor, the tenth capacitor, the eleventh capacitor, and the ISO_12V, the second diode is further connected to the eighteenth resistor, the tenth capacitor, the eleventh capacitor, and the ISO_12V, and the eleventh capacitor is respectively connected to the ISO_GND and the ISO_12V.

[0024] The utility model provides a MOS ignition circuit using isolation drive, including a PCBA board, on which are connected at least two alligator clips and a power supply capacitor for connecting to a car; wherein the PCBA board includes an MCU, a power loop circuit and an auxiliary isolated power supply, the power loop circuit is connected to the auxiliary isolated power supply, the power loop circuit and the auxiliary isolated power supply are respectively connected to the MCU, and a plurality of MOS tubes are provided in the power loop circuit. The MOS ignition circuit provided by the utility model, by providing a power loop circuit and an auxiliary isolated power supply, the auxiliary isolated power supply is used to power the power loop circuit, and the ignition circuit uses a plurality of MOS tubes as the power supply capacitor energy output switch of the car emergency starting power supply, and has the characteristics of fast speed and long repeated service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0026] Figure 1 This is a block diagram of a MOS ignition circuit using an isolated drive according to the present invention;

[0027] Figure 2 This is a circuit diagram of a power loop circuit of a MOS ignition circuit using an isolated drive according to the present invention;

[0028] Figure 3 This is a circuit diagram of an auxiliary isolated power supply of a MOS ignition circuit using an isolated drive according to the present invention. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0030] It should be noted that the descriptions of "first" and "second" in this utility model are for descriptive purposes only and should not be understood as indicating or implying their relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features specified as "first" and "second" may explicitly or implicitly include at least one of such features. In addition, the technical solutions between the various embodiments can be combined with each other, but this must be based on the fact that they can be implemented by ordinary technicians in this field. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by this utility model.

[0031] Please refer to Figures 1 to 3 , the utility model provides a MOS ignition circuit using an isolated drive, including a PCBA board, at least two alligator clips for connecting to a car and a power supply capacitor are connected to the PCBA board;

[0032] Among them, the PCBA board includes an MCU, a power loop circuit and an auxiliary isolated power supply. The power loop circuit is connected to the auxiliary isolated power supply. The power loop circuit and the auxiliary isolated power supply are respectively connected to the MCU, and multiple MOS tubes are arranged in the power loop circuit.

[0033] In this embodiment, the MOS ignition circuit using isolated drive is applied to an automobile emergency power supply. The automobile emergency power supply in the embodiment of the present application is used as a special emergency power supply for a 12V battery car that cannot ignite and start after the battery is depleted. It is also applicable to motorcycles, agricultural vehicles, motorboats, etc., regardless of gasoline or diesel vehicles, as long as they use 12V batteries.

[0034] Specifically, at least two crocodile clips and a power supply capacitor are connected to the PCBA board. The crocodile clips are used to connect to the car, and the power supply capacitor is used to charge the low-power car battery, that is, the power supply capacitor charges the connected car battery through the crocodile clips.

[0035] The PCBA board is equipped with an MCU, a power loop circuit and an auxiliary isolated power supply. The power loop circuit and the auxiliary isolated power supply are respectively connected to the MCU, and the power loop circuit is also connected to the auxiliary isolated power supply. The auxiliary isolated power supply is used to power the power loop circuit. In addition, multiple MOS tubes are also provided in the power loop circuit, so that the power loop circuit serves as an output switch for starting the power supply capacitor energy, with the characteristics of fast speed and long repeated service life.

[0036] Among them, the specific model of MCU is STM32F030CB / LQFP.

[0037] Furthermore, the PCBA board is also provided with a CAR+ connection position, a CAR- connection position and a CAP5+ connection position, at least two crocodile clips include a positive pole of the crocodile clip and a negative pole of the crocodile clip, the CAR+ connection position and the CAR- connection position are respectively connected to the positive pole of the crocodile clip and the negative pole of the crocodile clip, the CAP5+ connection position is connected to the positive pole of the power supply capacitor, and the CAR+ connection position and the CAP5+ connection position are respectively connected to the power loop circuit.

[0038] In this embodiment, at least two crocodile clips include a positive crocodile clip and a negative crocodile clip. The positive crocodile clip is used to connect to the positive battery of a low-power car, and the negative crocodile clip is used to connect to the negative battery of a low-power car. The PCBA board is provided with a CAR+ connection position, a CAR- connection position, and a CAP5+ connection position. The CAP5+ connection position is connected to the positive pole of the power supply capacitor. The CAR+ connection position and the CAR- connection position are respectively connected to the positive pole of the crocodile clip and the negative pole of the crocodile clip. The CAR+ connection position is connected to the positive pole of the battery through the positive pole of the crocodile clip, and the CAR- connection position is connected to the negative pole of the battery through the negative pole of the crocodile clip. Among them, the PCBA board is also provided with a CAP5- connection position. The CAP5- connection position is connected to the negative pole of the power supply capacitor. The CAP5+ connection position and the CAP5- connection position are respectively connected to the CAR+ connection position and the CAR- connection position connected to the positive pole and the negative pole of the crocodile clip.

[0039] Moreover, the CAR+ connection position and the CAP5+ connection position are respectively connected to a power loop circuit, which can enable the power loop circuit to serve as an output switch for connecting the CAP5+ connection position to the power supply capacitor energy. The switch can control the transmission of energy to the depleted car battery connected to the alligator clip connected to the CAR+ connection.

[0040] Furthermore, the multiple MOS tubes include a first MOS tube group and a second MOS tube group, the first MOS tube group and the second MOS tube group are connected in series between the positive electrode of the alligator clip connected to the CAR+ connection position and the positive electrode of the power supply capacitor, and the S pole of the first MOS tube group and the S pole of the second MOS tube group are connected.

[0041] In this embodiment, the multiple MOS tubes include a first MOS tube group and a second MOS tube group, and the first MOS tube group and the second MOS tube group are connected in series between the positive electrode of the alligator clip connected to the CAR+ connection position and the positive electrode of the power supply capacitor. The first MOS tube group and the second MOS tube group are connected in series in this manner, and the multiple MOS tubes connected in series here can be used as power electronic switches, thereby serving as energy output switches of the power supply capacitor, and power can be supplied to a low-power car battery through the alligator clip.

[0042] Specifically, the S electrodes of the first MOS transistor group and the second MOS transistor group are connected. The connection between the two can achieve a bidirectional blocking effect when the power loop circuit is turned off. Moreover, the S electrodes of the two MOS transistor groups are connected together. Only one controller can be used in the power loop circuit to control the VGS of the MOS transistors and perform switching at the same time to achieve the connection or shutdown of the power loop circuit.

[0043] Furthermore, the MCU includes an ISO_EN terminal, and the auxiliary isolated power supply is connected to the ISO_EN terminal. When the ISO_EN terminal outputs a low level, the auxiliary isolated power supply is turned off. When the ISO_EN terminal outputs a high level, the auxiliary isolated power supply is turned on to generate isolated ISO_12V and ISO_GND and power the power loop circuit.

[0044] In this embodiment, when the ISO_EN terminal outputs a low level, the auxiliary isolated power supply is turned off. When the ISO_EN terminal outputs a high level, isolated ISO_12V and ISO_GND are generated and provided to the power loop circuit. The power loop circuit is powered by the turned-on auxiliary isolated power supply, so that the power supply capacitor transfers energy to the alligator clip through the power loop circuit, and the depleted car battery is powered through the alligator clip.

[0045] Furthermore, the power loop circuit is connected to the positive and negative electrodes of the power supply capacitor, and also to the positive and negative electrodes of the crocodile clip, and the MCU also includes a MosSwOn terminal, a VDD terminal, and a DG terminal. The power loop circuit is also connected to the MosSwOn terminal, the VDD terminal, and the DG terminal of the MCU. The power loop circuit also includes an isolation driver ICU1, and the isolation driver ICU1 is connected to the auxiliary isolation power supply. The isolation driver ICU1 is also connected to the first MOS tube group and the second MOS tube group.

[0046] In this embodiment, the power loop circuit connects the positive and negative electrodes of the power supply capacitor to the positive and negative electrodes of the alligator clips. Since the power supply capacitor charges the depleted car battery through the alligator clips, the power loop circuit acts as an output switch to start the power supply capacitor and can disconnect or restore the connection between the power supply capacitor and the alligator clips.

[0047] In this embodiment, the power loop circuit includes an isolated driver ICU1. Before the first MOS tube group and the second MOS tube group work, it is necessary to turn on an auxiliary isolation power supply to power the output end of the isolation driver ICU1. When the auxiliary isolation power supply powers the isolation driver ICU1 so that the output of the isolation driver ICU1 is valid, the isolation voltage will be applied to the GS of the first MOS tube group and the second MOS tube group, so that the MOS tube between the positive electrode of the alligator clip and the positive electrode of the power supply capacitor is turned on. When the output of the isolation driver is invalid and the MOS tube between the positive electrode of the alligator clip and the positive electrode of the power supply capacitor is not required to work, the auxiliary isolation power supply is turned off.

[0048] Furthermore, the power loop circuit also includes a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, an eighth resistor R8, a ninth resistor R9, a tenth resistor R10, an eleventh resistor R11, a twelfth resistor R12, a thirteenth resistor R13, a first MOS transistor Q1, a first diode D1, a first Zener diode ZD1, a second Zener diode ZD2, a first capacitor C1, a second capacitor C2, a third capacitor C3, a fourth capacitor C4, a fifth capacitor C5, and an isolation driver ICU1;

[0049] The MosSwOn terminal of the MCU is connected to a first resistor R1, which is connected to a first capacitor C1, a second resistor R2, and the G terminal of the first MOS transistor Q1. The first capacitor C1 is connected to the second resistor R2 and the DG terminal. The second resistor R2 is connected to the DG terminal and the S terminal of the first MOS transistor Q1. The D terminal of the first MOS transistor Q1 is connected to a third resistor R3, which is connected to the isolation driver ICU1.

[0050] The isolation driver IC is also connected to the fourth resistor R4, ISO_GND, the first MOS transistor group, the second MOS transistor group, the first voltage regulator diode ZD1, the fifth resistor R5, the second capacitor C2, the third capacitor C3, the sixth resistor R6, the seventh resistor R7, the fourth capacitor C4, the fifth capacitor C5, and ISO_12V;

[0051] The fourth resistor R4 is connected to the VDD terminal;

[0052] The seventh resistor R7 is connected to the first diode D1. The first diode D1, the third capacitor C3, and the sixth resistor R6 are interconnected and respectively connected to the eighth resistor R8, the second capacitor C2, the ninth resistor R9, the second voltage zener diode ZD2, the first diode D1, the fifth resistor R5, the first MOS transistor group and the second MOS transistor group, the tenth resistor R10, the eleventh resistor R11, the twelfth resistor R12, and the thirteenth resistor R13.

[0053] The fourth capacitor C4 and the fifth capacitor C5 are connected to each other, and are also connected to ISO_GND and ISO_12V;

[0054] The D-pole of the first MOS tube group is connected to the CAP5+ connection bit, and the D-pole of the second MOS tube group is connected to the CAR+ connection bit.

[0055] In this embodiment, when the MosSwOn terminal of the MCU outputs a low level, the first MOS tube Q1 is turned off, the VOUT of the isolation driver ICU1 is pulled to VEE (ISO_GND), the VGS of all power MOS tubes in the first MOS tube group and the second MOS tube group are equal to 0, the power tube is disconnected, that is, the power loop circuit is turned off.

[0056] When the MosSwOn terminal of the MCU outputs a high level, the first MOS tube Q1 is turned on, and the VOUT of the isolation driver ICU1 is pulled to VCC (ISO_12V). The VGS of all power MOS tubes in the first MOS tube group and the second MOS tube group is equal to 12V, and the power tubes are turned on, that is, the power loop circuit is turned on.

[0057] When the power tube is turned on, the energy of the power supply capacitor of the starting power supply will be output to the low-power car through the alligator clip, and will be disconnected after the car starts to prevent the energy of the car generator from returning to the power supply capacitor.

[0058] In this embodiment, the specific model of the first MOS transistor Q1 is 2N7002, the specific models of the first Zener diode ZD1 and the second Zener diode ZD2 are both BZT52C15, the first capacitor C1 is specifically 101P, the third capacitor C3 is specifically 102P, the fourth capacitor C4 is specifically 104P, and the fifth capacitor C5 is specifically 104P.

[0059] Furthermore, the isolated driver ICU1 includes a CATHODE terminal, an NC terminal, an ANODE terminal, a VEE terminal, a VOUT terminal and a VCC terminal. The CATHODE terminal is connected to the third resistor R3, the ANODE terminal is connected to the fourth resistor R4, the VEE terminal is connected to ISO_GND, the first MOS tube group, the second MOS tube group, the first voltage regulator diode ZD1, the fifth resistor R5, and the second capacitor C2. The VOUT terminal is connected to the third capacitor C3, the sixth resistor R6, and the seventh resistor R7. The VCC terminal is connected to the fourth capacitor C4, the fifth capacitor C5 and ISO_12V.

[0060] Among them, the specific model of the isolation driver ICU1 is CA-IS3211VBJ / SOIC6-WB.

[0061] Furthermore, the first MOS transistor group includes a first discharge MOS transistor Q2, a second discharge MOS transistor Q3, and a third discharge MOS transistor Q4. The G electrode of the first discharge MOS transistor Q2 is connected to the thirteenth resistor R13, the D electrode is connected to the CAP5+ connection point, the D electrode of the second discharge MOS transistor Q3, and the D electrode of the third discharge MOS transistor Q4, and the S electrode is connected to the S electrode of the second MOS transistor group, the S electrode of the second discharge MOS transistor Q3, and the S electrode of the third discharge MOS transistor Q4; the G electrode of the second discharge MOS transistor Q3 is connected to the twelfth resistor R12, the D electrode is connected to the CAP5+ connection point and the D electrode of the third discharge MOS transistor Q4, and the S electrode is connected to the S electrode of the second MOS transistor group and the S electrode of the third discharge MOS transistor Q4; the G electrode of the third discharge MOS transistor Q4 is connected to the ninth resistor R9, the D electrode is connected to the CAP5+ connection point, and the S electrode is connected to the S electrode of the second MOS transistor group.

[0062] Furthermore, the second MOS transistor group includes a first anti-backflow MOS transistor Q5, a second anti-backflow MOS transistor Q6, and a third anti-backflow MOS transistor Q7. The G electrode of the first anti-backflow MOS transistor Q5 is connected to the eleventh resistor R11, the D electrode is connected to the CAR+ connection bit, the D electrode of the second anti-backflow MOS transistor Q6, and the D electrode of the third anti-backflow MOS transistor Q7, and the S electrode is connected to the S electrodes of the second anti-backflow MOS transistor Q6, the third anti-backflow MOS transistor Q7, and the S electrodes of the first discharge MOS transistor Q2, the second discharge MOS transistor Q3, and the third discharge MOS transistor Q4. The G electrode of the second backflow prevention MOS transistor Q6 is connected to the tenth resistor R10, the D electrode is connected to the CAR+ connection bit and the D electrode of the third backflow prevention MOS transistor Q7, and the S electrode is connected to the S electrode of the third backflow prevention MOS transistor Q7 and the S electrodes of the first discharge MOS transistor Q2, the second discharge MOS transistor Q3, and the third discharge MOS transistor Q4; the G electrode of the third backflow prevention MOS transistor Q7 is connected to the fifth resistor R5, the D electrode is connected to the CAR+ connection bit, and the S electrode is connected to the S electrodes of the first discharge MOS transistor Q2, the second discharge MOS transistor Q3, and the third discharge MOS transistor Q4.

[0063] In this embodiment, the S-pole terminals of the first discharge MOS transistor Q2, the second discharge MOS transistor Q3, and the third discharge MOS transistor Q4 in the first MOS transistor group are back-to-back connected to the S-pole terminals of the first anti-backflow MOS transistor Q5, the second anti-backflow MOS transistor Q6, and the third anti-backflow MOS transistor Q7 in the second MOS transistor group, enabling bidirectional blocking when turned off. Furthermore, the S-pole terminals of the MOS transistors in the first and second MOS transistor groups are connected together, and an isolation driver ICU1 can be used to control the VGS voltages of the MOS transistors for simultaneous switching. The first discharge MOS transistor Q2, the second discharge MOS transistor Q3, and the third discharge MOS transistor Q4 in the first MOS transistor group serve as discharge transistors. When the discharge MOS transistors are turned on, energy from the positive electrode of the power supply capacitor is transferred to the depleted vehicle battery via the positive electrode of the alligator clip. The first anti-backflow MOS transistor Q5, the second anti-backflow MOS transistor Q6, and the third anti-backflow MOS transistor Q7 in the second MOS transistor group serve as anti-backflow transistors. When the discharge transistors are turned off, they prevent energy from the vehicle end from being transferred to the power supply capacitor.

[0064] Specifically, the first discharge MOS transistor Q2 , the second discharge MOS transistor Q3 , the third discharge MOS transistor Q4 , the first anti-backflow MOS transistor Q5 , the second anti-backflow MOS transistor Q6 , and the third anti-backflow MOS transistor Q7 are all SS014N04LS / TOLL-8.

[0065] Furthermore, the auxiliary isolated power supply includes a fourteenth resistor R14, a fifteenth resistor R15, a sixteenth resistor R16, a seventeenth resistor R17, an eighteenth resistor R18, a sixth capacitor C6, a seventh capacitor C7, an eighth capacitor C8, a ninth capacitor C9, a tenth capacitor C10, an eleventh capacitor C11, a twelfth capacitor C12, a third Zener diode ZD3, a second diode D2, a third diode D3, a transformer T, a power supply POWER and a power supply chip U2. The power supply chip U2 includes a VIN terminal, an EN / UVLO terminal, a GND terminal, an RFB terminal and a SW terminal. ISO_EN is connected to the fourteenth resistor R14 and the EN / UVLO terminal. The fourteenth resistor R14 is connected to the GND terminal and to ground. The VIN terminal is connected to the sixth capacitor C6, the seventh capacitor C7, the power supply POWER and the eighth capacitor C8, the third Zener diode ZD3, and the input terminal of the transformer T. The sixth capacitor C6 and the seventh capacitor C7 are interconnected and grounded. The RFB terminal is connected to the ninth capacitor. The ninth capacitor C9 and the fifteenth resistor R15 are further connected to the ground. The fifteenth resistor R15 is further connected to the sixteenth resistor R16. The sixteenth resistor R16 is connected to the input end of the transformer T, the second diode D2, and the SW end. The second diode D2 is further connected to the eighth capacitor C8 and the third Zener diode ZD3. The output end of the transformer T is further connected to the seventeenth resistor R17, the third diode D3, the eighteenth resistor R18, the tenth capacitor C10, the eleventh capacitor C11, and ISO_GND. The seventeenth resistor R17 is further connected to the third diode D3 and the twelfth capacitor C12. The twelfth capacitor C12 is further connected to the second diode D2, the eighteenth resistor R18, the tenth capacitor C10, the eleventh capacitor C11, and ISO_12V. The second diode D2 is further connected to the eighteenth resistor R18, the tenth capacitor C10, the eleventh capacitor C11, and ISO_12V. The eleventh capacitor C11 is respectively connected to ISO_GND and ISO_12V.

[0066] In this embodiment, the power chip U2 is a PWM power chip with a built-in power tube, the VIN terminal is the power input, the RFB terminal is the output voltage regulation feedback terminal, the SW terminal is the switch power saving, and the EN / UVLO terminal is the IN / OFF control.

[0067] Furthermore, the specific working steps of the MOS ignition circuit using isolation drive are as follows:

[0068] When the ISO_EN terminal outputs a low level, the auxiliary isolation power supply is turned off, the MosSwOn terminal of the MCU also outputs a low level, the first MOS tube Q1 is turned off, and the VOUT of the isolation driver ICU1 is pulled to VEE (ISO_GND). The VGS of all power MOS tubes in the first MOS tube group and the second MOS tube group are equal to 0, and the power tubes are disconnected, that is, the power loop circuit is turned off.

[0069] When the ISO_EN terminal outputs a high level, isolated ISO_12V and ISO_GND are generated and provided to the power loop circuit. When the MosSwOn terminal of the MCU outputs a high level, the first MOS tube Q1 is turned on, and the VOUT of the isolation driver ICU1 is pulled to VCC (ISO_12V). That is, by turning on the auxiliary isolation power supply to power the isolation driver ICU1 so that the output of the isolation driver ICU1 is valid, the isolation voltage is applied to the VGS of the first MOS tube group and the second MOS tube group. The VGS of all power MOS tubes in the first MOS tube group and the second MOS tube group is equal to 12V, the power tube is turned on, that is, the power loop circuit is turned on, so that the power supply capacitor transfers energy to the alligator clip through the power loop circuit, and then powers the depleted car battery through the alligator clip.

[0070] The utility model provides a MOS ignition circuit using isolation drive, including a PCBA board, on which are connected at least two alligator clips and a power supply capacitor for connecting to a car; wherein the PCBA board includes an MCU, a power loop circuit and an auxiliary isolated power supply, the power loop circuit is connected to the auxiliary isolated power supply, the power loop circuit and the auxiliary isolated power supply are respectively connected to the MCU, and a plurality of MOS tubes are provided in the power loop circuit. The MOS ignition circuit provided by the utility model, by providing a power loop circuit and an auxiliary isolated power supply, the auxiliary isolated power supply is used to power the power loop circuit, and the ignition circuit uses a plurality of MOS tubes as the power supply capacitor energy output switch of the car emergency starting power supply, and has the characteristics of fast speed and long repeated service life.

[0071] It should be noted that the various embodiments in the present invention are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same and similar parts between the various embodiments can be referred to each other.

[0072] It should also be noted that, in the present invention, relational terms such as first and second, etc. are merely used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article, or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or elements inherent to such process, method, article, or device. In the absence of further restrictions, an element defined by the phrase "comprising a ..." does not exclude the presence of other identical elements in the process, method, article, or device comprising the element.

[0073] The above description of the disclosed embodiments is intended to enable one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not limited to the embodiments shown herein, but is intended to be applied in the widest possible manner consistent with the principles and novel features disclosed herein.

Claims

1. A MOS ignition circuit using isolation drive, characterized in that: The PCBA board includes at least two alligator clips for connecting to a car and a power supply capacitor. Among them, the PCBA board includes an MCU, a power loop circuit and an auxiliary isolated power supply. The power loop circuit is connected to the auxiliary isolated power supply. The power loop circuit and the auxiliary isolated power supply are respectively connected to the MCU, and multiple MOS tubes are provided in the power loop circuit.

2. The MOS sparking circuit using isolation drive according to claim 1, characterized in that: The PCBA board is also provided with a CAR+ connection position, a CAR- connection position and a CAP5+ connection position, at least two of the crocodile clips include a positive pole of the crocodile clip and a negative pole of the crocodile clip, the CAR+ connection position and the CAR- connection position are respectively connected to the positive pole of the crocodile clip and the negative pole of the crocodile clip, the CAP5+ connection position is connected to the positive pole of the power supply capacitor, and the CAR+ connection position and the CAP5+ connection position are respectively connected to the power loop circuit.

3. The MOS sparking circuit using isolation drive according to claim 2, characterized in that: The multiple MOS tubes include a first MOS tube group and a second MOS tube group. The first MOS tube group and the second MOS tube group are connected in series between the positive electrode of the alligator clip connected to the CAR+ connection position and the positive electrode of the power supply capacitor, and the S pole of the first MOS tube group is connected to the S pole of the second MOS tube group.

4. The MOS sparking circuit using isolation drive according to claim 3, characterized in that: The MCU includes an ISO_EN terminal, and the auxiliary isolated power supply is connected to the ISO_EN terminal. When the ISO_EN terminal outputs a low level, the auxiliary isolated power supply is turned off. When the ISO_EN terminal outputs a high level, the auxiliary isolated power supply is turned on to generate isolated ISO_12V and ISO_GND and power the power loop circuit.

5. The MOS sparking circuit using isolation drive according to claim 4, characterized in that: The power loop circuit is connected to the positive and negative electrodes of the power supply capacitor, and is also connected to the positive and negative electrodes of the crocodile clip, and the MCU also includes a MosSwOn terminal, a VDD terminal, and a DG terminal. The power loop circuit is also connected to the MosSwOn terminal, the VDD terminal, and the DG terminal of the MCU. The power loop circuit also includes an isolation driver IC, and the isolation driver IC is connected to the auxiliary isolation power supply. The isolation driver IC is also connected to the first MOS tube group and the second MOS tube group.

6. The MOS sparking circuit using isolation drive according to claim 5, characterized in that: The power loop circuit further includes a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor, a ninth resistor, a tenth resistor, an eleventh resistor, a twelfth resistor, a thirteenth resistor, a first MOS transistor, a first diode, a first voltage-stabilizing diode, a second voltage-stabilizing diode, a first capacitor, a second capacitor, a third capacitor, a fourth capacitor, and a fifth capacitor; The MosSwOn terminal of the MCU is connected to the first resistor, the first resistor is connected to the first capacitor, the second resistor, and the G terminal of the first MOS tube, the first capacitor is connected to the second resistor and the DG terminal, the second resistor is connected to the DG terminal and the S terminal of the first MOS tube, the D terminal of the first MOS tube is connected to the third resistor, and the third resistor is connected to the isolation driver IC; The isolation driver IC is further connected to the fourth resistor, the ISO_GND, the first MOS tube group, the second MOS tube group, the first voltage regulator diode, the fifth resistor, the second capacitor, the third capacitor, the sixth resistor, the seventh resistor, the fourth capacitor, the fifth capacitor, and ISO_12V; The fourth resistor is connected to the VDD terminal; The seventh resistor is connected to the first diode, the first diode, the third capacitor, and the sixth resistor are connected to each other, and are respectively connected to the eighth resistor, the second capacitor, the ninth resistor, the second voltage regulator diode, the first diode, the fifth resistor, the first MOS transistor group, the second MOS transistor group, the tenth resistor, the eleventh resistor, the twelfth resistor, and the thirteenth resistor; The fourth capacitor and the fifth capacitor are connected to each other, and are also connected to the ISO_GND and the ISO_12V; The D-pole of the first MOS transistor group is connected to the CAP5+ connection bit, and the D-pole of the second MOS transistor group is connected to the CAR+ connection bit.

7. The MOS sparking circuit using isolation drive according to claim 6, characterized in that: The isolation driver IC includes a CATHODE terminal, an NC terminal, an ANODE terminal, a VEE terminal, a VOUT terminal and a VCC terminal. The CATHODE terminal is connected to the third resistor, the ANODE terminal is connected to the fourth resistor, the VEE terminal is connected to the ISO_GND, the first MOS tube group, the second MOS tube group, the first voltage regulator diode, the fifth resistor, and the second capacitor. The VOUT terminal is connected to the third capacitor, the sixth resistor, and the seventh resistor. The VCC terminal is connected to the fourth capacitor, the fifth capacitor and the ISO_12V.

8. The MOS sparking circuit using isolation drive according to claim 6, characterized in that: The first MOS transistor group includes a first discharge MOS transistor, a second discharge MOS transistor, and a third discharge MOS transistor. The G electrode of the first discharge MOS transistor is connected to the thirteenth resistor, the D electrode is connected to the CAP5+ connection point, the D electrode of the second discharge MOS transistor, and the D electrode of the third discharge MOS transistor, and the S electrode is connected to the S electrode of the second MOS transistor group, the S electrode of the second discharge MOS transistor, and the S electrode of the third discharge MOS transistor; the G electrode of the second discharge MOS transistor is connected to the twelfth resistor, the D electrode is connected to the CAP5+ connection point and the D electrode of the third discharge MOS transistor, and the S electrode is connected to the S electrode of the second MOS transistor group and the S electrode of the third discharge MOS transistor; the G electrode of the third discharge MOS transistor is connected to the ninth resistor, the D electrode is connected to the CAP5+ connection point, and the S electrode is connected to the S electrode of the second MOS transistor group.

9. The MOS sparking circuit using isolation drive according to claim 8, characterized in that: The second MOS transistor group includes a first backflow prevention MOS transistor, a second backflow prevention MOS transistor, and a third backflow prevention MOS transistor. The G electrode of the first backflow prevention MOS transistor is connected to the eleventh resistor, the D electrode is connected to the CAR+ connection bit, the D electrode of the second backflow prevention MOS transistor, and the D electrode of the third backflow prevention MOS transistor, and the S electrode is connected to the S electrodes of the second and third backflow prevention MOS transistors and the S electrodes of the first, second, and third discharge MOS transistors; the G electrode of the second backflow prevention MOS transistor is connected to the tenth resistor, the D electrode is connected to the CAR+ connection bit and the D electrode of the third backflow prevention MOS transistor, and the S electrode is connected to the S electrode of the third backflow prevention MOS transistor and the S electrodes of the first, second, and third discharge MOS transistors; the G electrode of the third backflow prevention MOS transistor is connected to the fifth resistor, the D electrode is connected to the CAR+ connection bit, and the S electrode is connected to the S electrodes of the first, second, and third discharge MOS transistors.

10. The MOS sparking circuit using isolation drive according to claim 5, characterized in that: The auxiliary isolated power supply includes a fourteenth resistor, a fifteenth resistor, a sixteenth resistor, a seventeenth resistor, an eighteenth resistor, a sixth capacitor, a seventh capacitor, an eighth capacitor, a ninth capacitor, a tenth capacitor, an eleventh capacitor, a twelfth capacitor, a third voltage-stabilizing diode, a second diode, a third diode, a transformer, a power supply and a power supply chip. The power supply chip includes a VIN terminal, an EN / UVLO terminal, a GND terminal, an RFB terminal and a SW terminal. The ISO_EN is connected to the fourteenth resistor and the EN / UVLO terminal, the fourteenth resistor is connected to the GND terminal and to ground, the VIN terminal is connected to the sixth capacitor, the seventh capacitor, the power supply and the eighth capacitor, the third voltage-stabilizing diode and the input terminal of the transformer, the sixth capacitor and the seventh capacitor are connected to each other and are grounded, and the RFB terminal is connected to the ninth capacitor and the fifteenth resistor. The ninth capacitor is also grounded, the fifteenth resistor is further connected to the sixteenth resistor, the sixteenth resistor is connected to the input end of the transformer, the second diode, and the SW end, the second diode is further connected to the eighth capacitor and the third voltage-stabilizing diode, the output end of the transformer is further connected to the seventeenth resistor, the third diode, the eighteenth resistor, the tenth capacitor, the eleventh capacitor, and the ISO_GND, the seventeenth resistor is further connected to the third diode and the twelfth capacitor, the twelfth capacitor is further connected to the second diode, the eighteenth resistor, the tenth capacitor, the eleventh capacitor, and the ISO_12V, the second diode is further connected to the eighteenth resistor, the tenth capacitor, the eleventh capacitor, and the ISO_12V, and the eleventh capacitor is respectively connected to the ISO_GND and the ISO_12V.

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