CDI ignition circuit of outboard engine

Abstract

The invention provides an outboard engine CDI ignition circuit, and belongs to the technical field of ignition circuits, the ignition circuit comprises a magneto, a rectification unit, a high voltage capacitor C1, an ignition unit and a rotation speed control unit; the output end of the magneto is connected with the rectifying unit, the output end of the rectifying unit is connected with the first end of the high-voltage capacitor C1, the second end of the high-voltage capacitor C1 is connected with the ignition unit, and the rotating speed control unit is connected with the second end of the high-voltage capacitor C1 and the ignition unit. The rectifying unit converts alternating current output by the magneto into direct current and supplies power to the high-voltage capacitor C1. The second end of the high-voltage capacitor C1 is connected with an ignition unit, and the ignition unit is used for controlling discharge of the high-voltage capacitor C1 so as to control ignition; the ignition circuit adopts pure hardware, so that the technical problems of high software development time cost and high microprocessor cost are solved.

Description

Technical Field

[0001] The present invention belongs to the technical field of ignition circuits, and particularly relates to a CDI ignition circuit for an outboard motor. Background Art

[0002] An outboard motor, as one of the key components of a ship propulsion system, is usually installed on the outside of a ship or boat, that is, on the ship's side, to provide the power required for navigation and drive the ship forward.

[0003] CDI, full name Capacitor Discharge Ignition Module, is an electronic ignition system widely used in multiple fields. Behind the powerful power output of motorcycles, the efficient operation of lawn mowers, the stable start of small engines, and even the precise control of turbofan aircraft, the CDI system is indispensable.

[0004] At present, the CDI system equipped on outboard motors has a relatively high technical content in its operating mechanism. On the one hand, in terms of hardware composition, it not only relies on the microprocessing unit (MCU) to shoulder the core data processing task, but also requires a series of peripheral devices adapted to it and high-precision sensors to cooperate. The cost of the microprocessing unit and sensors is relatively high. On the other hand, at the software level, through complex and delicate calculations, key links such as ignition timing and ignition intensity need to be accurately controlled, and the time cost of software development is relatively high.

[0005] Therefore, the present invention provides a CDI ignition circuit for an outboard motor. Summary of the Invention

[0006] The present invention provides a CDI ignition circuit for an outboard motor to at least solve the problems of high software development time cost and high microprocessor cost in the prior art.

[0007] The ignition circuit includes a magneto, a rectifying unit, a high-voltage capacitor C1, an ignition unit, and a speed control unit; The output end of the magneto is connected to the rectifying unit, the output end of the rectifying unit is connected to the first end of the high-voltage capacitor C1, the second end of the high-voltage capacitor C1 is connected to the ignition unit, and the speed control unit is respectively connected to the second end of the high-voltage capacitor C1 and the ignition unit. The rectifying unit converts the alternating current output by the magneto into direct current and supplies power to the high-voltage capacitor C1; the second end of the high-voltage capacitor C1 is connected to the ignition unit, and the ignition unit is used to control the discharge of the high-voltage capacitor C1, thereby controlling ignition; the speed control unit is used to control the speed of the magneto. The ignition circuit uses pure hardware to solve the technical problems of high software development time cost and high microprocessor cost.

[0008] Further, the rectifying unit includes a bridge rectifier D1; The first input terminal and the second input terminal of the bridge rectifier D1 are both connected to the output terminal of the magneto. The first output terminal of the bridge rectifier D1 is grounded, and the second output terminal of the bridge rectifier D1 is connected to the first end of the high-voltage capacitor C1. The second end of the high-voltage capacitor C1 is grounded. The rectification unit converts the alternating current generated by the magneto into direct current and supplies power to the high-voltage capacitor C1.

[0009] Further, the ignition unit includes a thyristor SCR1, a high-voltage coil for spark plug, a resistor R1, and a trigger coil; The anode of the thyristor SCR1 is connected to the first end of the high-voltage capacitor C1; the control electrode of the thyristor SCR1 is connected to the first end of the resistor R1, and the second end of the resistor R1 is connected to the trigger coil; the cathode of the thyristor SCR1 is connected to the first end of the high-voltage coil for spark plug, and the second end of the high-voltage coil for spark plug is grounded. The trigger coil generates an ignition signal, which is connected to the control electrode of the thyristor SCR1 through the first end of the resistor R1, thereby controlling the conduction of the thyristor SCR1, and then instantly releasing the energy stored in the high-voltage capacitor C1 to the high-voltage coil for spark plug, thereby achieving ignition.

[0010] Further, the ignition circuit further includes a temperature detection unit, and the temperature detection unit includes a temperature sensor, and the temperature sensor is placed on the cylinder block of the engine. The temperature of the engine is detected by the temperature sensor.

[0011] Further, the temperature detection unit further includes a resistor R19, a resistor R20, a thyristor output optocoupler OP1, and a resistor R21; The first end of the resistor R19 is respectively connected to the temperature sensor and the first input terminal of the thyristor output optocoupler OP1; the second end of the resistor R19 is respectively connected to the first end of the resistor R20 and the second input terminal of the thyristor output optocoupler OP1; The first output terminal of the thyristor output optocoupler OP1 is connected to the input terminal of the speed control unit, and the output terminal of the speed control unit is respectively connected to the first end of the high-voltage capacitor C1 and the anode of the thyristor SCR1; The second output terminal of the thyristor output optocoupler OP1 is connected to the first end of the resistor R21, and the second end of the resistor R21 is grounded. The temperature of the cylinder block of the engine is detected by the temperature sensor. When the temperature of the cylinder block of the engine is higher than the preset temperature, the temperature sensor will be directly grounded, the second output terminal of the thyristor output optocoupler OP1 is pulled down to the ground through the resistor R21, and the maximum speed of the engine is limited through the speed control unit.

[0012] Further, the rotational speed control unit includes a resistor R3, a thyristor SCR2, a resistor R4, a PNP type triode Q1, a resistor R5, an operational amplifier U1, a frequency-voltage converter, a resistor R6, a resistor R7, a resistor R8, a resistor R9, and a resistor R10; The first end of the resistor R3 is respectively connected to the first end of the high-voltage capacitor C1 and the anode of the thyristor SCR1; The second end of the resistor R3 is connected to the anode of the thyristor SCR2, and the cathode of the thyristor SCR2 is grounded; The control electrode of the thyristor SCR2 is connected to the first end of the resistor R4, the second end of the resistor R4 is connected to the collector of the PNP type triode Q1, the base of the PNP type triode Q1 is connected to the first end of the resistor R5, and the second end of the resistor R5 is respectively connected to the output end of the operational amplifier U1 and the first end of the resistor R6; The inverting input terminal of the operational amplifier U1 is connected to the frequency-voltage converter, and the non-inverting input terminal of the operational amplifier U1 is respectively connected to the second end of the resistor R6, the first end of the resistor R7, and the first end of the resistor R8; the second end of the resistor R8 is grounded; The second end of the resistor R6 is also respectively connected to the first end of the resistor R7, the first end of the resistor R8, and the first end of the resistor R9; the second end of the resistor R9 is connected to the first end of the resistor R10, and the second end of the resistor R10 is grounded; The non-inverting input terminal of the operational amplifier U1, the second end of the resistor R6, the first end of the resistor R7, and the first end of the resistor R8 are all connected to the first output terminal of the silicon-controlled output optocoupler OP1. The rotational speed control unit is used to limit the highest preset rotational speed of the engine, and limit a lower rotational speed after the engine exceeds the preset temperature until the engine runs normally after restarting.

[0013] Further, the ignition circuit further includes a quick start unit, and the quick start unit includes an operational amplifier U2, an operational amplifier U3, an operational amplifier U4, an NPN type triode Q2, trigger coil power supply, key ignition signal, a resistor R11, a resistor R12, a resistor R13, a resistor R14, a resistor R15, a resistor R16, a resistor R17, a resistor R18, a diode D3, a diode D4, and a capacitor C2; The inverting input terminal of the operational amplifier U2 is respectively connected to the frequency-voltage converter and the inverting input terminal of the operational amplifier U1, and the non-inverting input terminal of the operational amplifier U2 is respectively connected to the first end of the resistor R10 and the second end of the resistor R9; The output terminal of the operational amplifier U2 is connected to the first end of the resistor R11, and the second end of the resistor R11 is respectively connected to the first end of the resistor R12, the output terminal of the operational amplifier U4, and the non-inverting input terminal of the operational amplifier U3; the second end of the resistor R12 is grounded; The inverting input terminal of the operational amplifier U3 is respectively connected to the first end of the resistor R13 and the first end of the resistor R14, and the second end of the resistor R14 is grounded; the output terminal of the operational amplifier U3 is connected to the base of the NPN transistor Q2, and the emitter of the NPN transistor Q2 is connected to supply power to the trigger coil; The inverting input terminal of the operational amplifier U4 is respectively connected to the first end of the resistor R15 and the first end of the resistor R16, and the second end of the resistor R16 is grounded; the non-inverting input terminal of the operational amplifier U4 is respectively connected to the first end of the resistor R17 and the first end of the resistor R18, and the second end of the resistor R18 is grounded; the second end of the resistor R17 is connected to the cathode of the diode D4, and the anode of the diode D4 is respectively connected to the anode of the diode D3 and the output terminal of the key ignition signal; the cathode of the diode D3 is connected to the first end of the capacitor C2, and the second end of the capacitor C2 is grounded.

[0014] Further, the ignition circuit further includes an emergency stop unit, and the emergency stop unit includes an emergency stop button and a resistor R2; The first end of the resistor R2 is respectively connected to the first end of the high-voltage capacitor C1 and the anode of the thyristor SCR1; The second end of the resistor R2 is connected to the emergency stop button. The emergency stop button generates an emergency stop signal, which is connected to the anode of the thyristor SCR1 through the first end of the resistor R2, thereby controlling the thyristor SCR1 to turn off, so as to stop releasing the energy stored in the high-voltage capacitor C1 to the high-voltage package spark plug, and thus achieve fire extinguishing.

[0015] Further, the rectification unit further includes a bridge rectifier D2, an NPN transistor Q3, a zener diode DZ1, a current-limiting resistor R22, and a capacitor C3; The first input terminal and the second input terminal of the bridge rectifier D2 are both connected to the output terminal of the magneto; The first input terminal of the bridge rectifier D2 is grounded, the second input terminal of the bridge rectifier D2 is connected to the collector of the NPN transistor Q3, and the emitter of the NPN transistor Q3 is connected to the power output; The base of the NPN transistor Q3 is respectively connected to the first end of the zener diode DZ1 and the first end of the current-limiting resistor R22; The second terminal of the voltage stabilizing diode DZ1 is grounded. The second terminal of the current limiting resistor R22 is connected to the first terminal of the capacitor C3, and the second terminal of the capacitor C3 is grounded.

[0016] The rectifying unit converts the alternating current generated by the magneto into direct current. One path passes through a linear voltage stabilizing circuit composed of a triode Q3, a voltage stabilizing diode DZ1, a capacitor C3, and a resistor R22, and the power supply output of the NPN type triode Q3 supplies power to other modules.

[0017] Further, the bridge rectifier D1 is composed of four rectifying diodes, and the bridge rectifier D2 is composed of four rectifying diodes.

[0018] As can be seen from the above technical solutions, the present invention has the following advantages: In the CDI ignition circuit of the outboard engine provided in this application, the ignition circuit uses pure hardware, which solves the technical problems of high software development time cost and high microprocessor cost; The rectifying unit converts the alternating current output by the magneto into direct current and supplies power to the high-voltage capacitor C1; the second terminal of the high-voltage capacitor C1 is connected to the ignition unit, and the ignition unit is used to control the discharge of the high-voltage capacitor C1, thereby controlling ignition; the speed control unit is used to control the speed of the engine. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions of the present invention, the drawings required for description will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0020] Figure 1 It is the circuit schematic diagram of the CDI ignition circuit of the outboard engine. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0021] In the following, the CDI ignition circuit of the outboard engine will be described in detail, and various embodiments of the present disclosure will be described more comprehensively. The present disclosure may have various embodiments, and adjustments and changes can be made therein. However, it should be understood that there is no intention to limit the various embodiments of the present disclosure to the specific embodiments disclosed herein, but the present disclosure should be understood to cover all adjustments, equivalents, and / or alternative solutions falling within the spirit and scope of the various embodiments of the present disclosure.

[0022] Hereinafter, the term "comprising" or "may comprise" that may be used in various embodiments of the present disclosure indicates the presence of the disclosed functions, operations, or elements, and does not limit the addition of one or more functions, operations, or elements. Further, as used in various embodiments of the present disclosure, the terms "comprising", "having", and their cognates are only intended to represent a specific feature, number, step, operation, element, component, or combination of the foregoing items, and should not be construed as precluding the presence of one or more other features, numbers, steps, operations, elements, components, or combinations of the foregoing items or the possibility of adding one or more features, numbers, steps, operations, elements, components, or combinations of the foregoing items.

[0023] In various embodiments of the present disclosure, the expression "or" or "at least one of A or / and B" includes any combination or all combinations of the recited words. For example, the expression "A or B" or "at least one of A or / and B" may include A, may include B, or may include both A and B.

[0024] Expressions (such as "first", "second", etc.) used in various embodiments of the present disclosure may modify various constituent elements in the various embodiments, but do not limit the corresponding constituent elements. For example, the above expressions do not limit the order and / or importance of the elements. The above expressions are only for the purpose of distinguishing one element from other elements. For example, the first user device and the second user device indicate different user devices, although both are user devices. For example, without departing from the scope of the various embodiments of the present disclosure, the first element may be referred to as the second element, and similarly, the second element may also be referred to as the first element.

[0025] It should be noted that: If it is described that one constituent element is "connected" to another constituent element, the first constituent element may be directly connected to the second constituent element, and a third constituent element may be "connected" between the first constituent element and the second constituent element. Conversely, when one constituent element is "directly connected" to another constituent element, it can be understood that there is no third constituent element between the first constituent element and the second constituent element.

[0026] The term "user" used in various embodiments of the present disclosure may indicate a person who uses an electronic device, which may be a monitoring person, or a testing person, or an operating person.

[0027] Hereinafter, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0028] The embodiment of the present application provides an outboard engine CDI ignition circuit, which solves the technical problems of high software development time cost and high microprocessor cost that are urgently needed at present.

[0029] The technical solutions proposed in the embodiments of the present application will be described in detail below with reference to the accompanying drawings.

[0030] Figure 1 It is the circuit schematic diagram of an outboard engine CDI ignition circuit provided by the embodiment of the present application. As Figure 1 shown, an outboard engine CDI ignition circuit provided by the embodiment of the present application specifically includes: a magneto, a rectification unit, a high-voltage capacitor C1, an ignition unit, and a speed control unit.

[0031] The output end of the magneto is connected to the rectification unit, the output end of the rectification unit is connected to the first end of the high-voltage capacitor C1, the second end of the high-voltage capacitor C1 is connected to the ignition unit, and the speed control unit is respectively connected to the second end of the high-voltage capacitor C1 and the ignition unit.

[0032] The rectification unit converts the alternating current output by the magneto into direct current and supplies power to the high-voltage capacitor C1. The second end of the high-voltage capacitor C1 is connected to the ignition unit, and the ignition unit is used to control the discharge of the high-voltage capacitor C1, thereby controlling ignition. The speed control unit is used to control the speed of the magneto. The ignition circuit adopts pure hardware, which solves the technical problems of high software development time cost and high microprocessor cost.

[0033] In an exemplary embodiment, the rectification unit includes a bridge rectifier D1. The first input end of the bridge rectifier D1 and the second input end of the bridge rectifier D1 are both connected to the output end of the magneto. The first output end of the bridge rectifier D1 is grounded, and the second output end of the bridge rectifier D1 is connected to the first end of the high-voltage capacitor C1. The second end of the high-voltage capacitor C1 is grounded. The rectification unit converts the alternating current generated by the magneto into direct current and supplies power to the high-voltage capacitor C1.

[0034] According to another embodiment of the present invention, the ignition unit includes a thyristor SCR1, a high-voltage coil spark plug, a resistor R1, and a trigger coil.

[0035] The anode of the thyristor SCR1 is connected to the first end of the high-voltage capacitor C1; the control electrode of the thyristor SCR1 is connected to the first end of the resistor R1, the second end of the resistor R1 is connected to the trigger coil; the cathode of the thyristor SCR1 is connected to the first end of the high-voltage coil spark plug, and the second end of the high-voltage coil spark plug is grounded.

[0036] The trigger coil generates an ignition signal, which is connected to the control electrode of the thyristor SCR1 through the first end of the resistor R1, thereby controlling the conduction of the thyristor SCR1. Then, the energy stored in the high-voltage capacitor C1 is instantaneously released to the high-voltage coil and spark plug, thereby achieving ignition. The high-voltage coil and spark plug utilize this energy to generate an electric spark, thereby achieving ignition and igniting the air-fuel mixture in the engine to drive the engine to operate.

[0037] In an exemplary embodiment, the ignition circuit further includes a temperature detection unit, and the temperature detection unit includes a temperature sensor placed on the cylinder block of the engine. The temperature of the engine is detected by the temperature sensor.

[0038] According to an embodiment of the present application, the temperature detection unit further includes a resistor R19, a resistor R20, a thyristor output optocoupler OP1, and a resistor R21.

[0039] The first end of the resistor R19 is respectively connected to the temperature sensor and the first input terminal of the thyristor output optocoupler OP1; the second end of the resistor R19 is respectively connected to the first end of the resistor R20 and the second input terminal of the thyristor output optocoupler OP1, and the second end of the resistor R20 is connected to the output of the power supply circuit.

[0040] The first output terminal of the thyristor output optocoupler OP1 is connected to the input terminal of the speed control unit, and the output terminal of the speed control unit is respectively connected to the first end of the high-voltage capacitor C1 and the anode of the thyristor SCR1.

[0041] The second output terminal of the thyristor output optocoupler OP1 is connected to the first end of the resistor R21, and the second end of the resistor R21 is grounded. The temperature of the cylinder block of the engine is detected by the temperature sensor. When the temperature of the cylinder block of the engine is higher than a preset temperature, the temperature sensor will be directly grounded, and the second output terminal of the thyristor output optocoupler OP1 is pulled down to ground through the resistor R21, and the maximum speed of the engine is limited through the speed control unit.

[0042] According to an embodiment of the present application, the thyristor output optocoupler OP1 includes a light-emitting diode and a triac. The anode of the light-emitting diode is respectively connected to the second end of the resistor R19 and the first end of the resistor R20, and the cathode of the light-emitting diode is respectively connected to the first end of the resistor R19 and the temperature sensor. The first end of the triac is grounded through the resistor R21, and the second end of the triac is connected to the speed control unit.

[0043] In one embodiment, the rotational speed control unit includes a resistor R3, a thyristor SCR2, a resistor R4, a PNP type triode Q1, a resistor R5, an operational amplifier U1, a frequency-voltage converter, a resistor R6, a resistor R7, a resistor R8, a resistor R9, and a resistor R10.

[0044] The first end of the resistor R3 is respectively connected to the first end of the high-voltage capacitor C1 and the anode of the thyristor SCR1.

[0045] The second end of the resistor R3 is connected to the anode of the thyristor SCR2, and the cathode of the thyristor SCR2 is grounded.

[0046] The control electrode of the thyristor SCR2 is connected to the first end of the resistor R4, the second end of the resistor R4 is connected to the collector of the PNP type triode Q1, and the emitter of the PNP type triode Q1 is connected to the output of the power supply circuit; the base of the PNP type triode Q1 is connected to the first end of the resistor R5, and the second end of the resistor R5 is respectively connected to the output end of the operational amplifier U1 and the first end of the resistor R6.

[0047] The inverting input terminal of the operational amplifier U1 is connected to the frequency-voltage converter, and the non-inverting input terminal of the operational amplifier U1 is respectively connected to the second end of the resistor R6, the first end of the resistor R7, and the first end of the resistor R8; the second end of the resistor R8 is grounded. The second end of the resistor R7 is connected to the output of the power supply circuit.

[0048] The second end of the resistor R6 is also respectively connected to the first end of the resistor R7, the first end of the resistor R8, and the first end of the resistor R9; the second end of the resistor R9 is connected to the first end of the resistor R10, and the second end of the resistor R10 is grounded.

[0049] The non-inverting input terminal of the operational amplifier U1, the second end of the resistor R6, the first end of the resistor R7, and the first end of the resistor R8 are all connected to the first output terminal of the silicon-controlled output optocoupler OP1.

[0050] The rotation speed control unit is used to limit the maximum preset rotation speed of the magneto, and limit a lower rotation speed after the magneto exceeds the preset temperature until the magneto runs normally after restarting. The working principle of the rotation speed control unit is as follows: First, the AC signal output by the magneto is converted into an analog voltage through the frequency-voltage converter, and the analog voltage is applied to the inverting input terminal of the operational amplifier U1. The non-inverting input terminal of the operational amplifier U1 is connected to the output terminal of the operational amplifier U1, thereby forming a common feedback comparator. The non-inverting input terminal of the operational amplifier U1 obtains a stable potential by dividing the voltage of the resistor R7 and the resistor R8, and is simultaneously connected to the first output terminal of the thyristor output optocoupler OP1 of the temperature detection unit. Thus, when the rotation speed of the magneto is higher than the preset frequency, the voltage at the inverting input terminal of the operational amplifier U1 will be greater than the voltage at the non-inverting input terminal of the operational amplifier U1, and the output terminal of the operational amplifier U1 outputs a low voltage, so that the PNP-type triode Q1 is turned on, then the thyristor SCR2 is turned on, and finally the high-voltage capacitor C1 discharges, and the engine cannot be ignited, thereby limiting the maximum rotation speed of the engine. When the temperature of the engine exceeds the preset temperature value, the potential at the non-inverting input terminal of the operational amplifier U1 becomes lower, thereby limiting the magneto to run at a smaller rotation speed until the engine restarts and returns to normal, which effectively avoids the engine running at a high rotation speed under high temperature and protects the engine.

[0051] As an example, the ignition circuit further includes a quick start unit, and the quick start unit includes an operational amplifier U2, an operational amplifier U3, an operational amplifier U4, an NPN-type triode Q2, trigger coil power supply, key ignition signal, resistors R11, R12, R13, R14, R15, R16, R17, R18, diodes D3, D4 and a capacitor C2.

[0052] The inverting input terminal of the operational amplifier U2 is respectively connected to the frequency-voltage converter and the inverting input terminal of the operational amplifier U1, and the non-inverting input terminal of the operational amplifier U2 is respectively connected to the first end of the resistor R10 and the second end of the resistor R9.

[0053] The output terminal of the operational amplifier U2 is connected to the first end of the resistor R11, and the second end of the resistor R11 is respectively connected to the first end of the resistor R12, the output terminal of the operational amplifier U4 and the non-inverting input terminal of the operational amplifier U3; the second end of the resistor R12 is grounded.

[0054] The inverting input terminal of the operational amplifier U3 is respectively connected to the first terminal of the resistor R13 and the first terminal of the resistor R14, and the second terminal of the resistor R14 is grounded; the output terminal of the operational amplifier U3 is connected to the base of the NPN transistor Q2, and the emitter of the NPN transistor Q2 is connected to the trigger coil for power supply.

[0055] The inverting input terminal of the operational amplifier U4 is respectively connected to the first terminal of the resistor R15 and the first terminal of the resistor R16, and the second terminal of the resistor R16 is grounded; the non-inverting input terminal of the operational amplifier U4 is respectively connected to the first terminal of the resistor R17 and the first terminal of the resistor R18, and the second terminal of the resistor R18 is grounded; the second terminal of the resistor R17 is connected to the cathode of the diode D4, and the anode of the diode D4 is respectively connected to the anode of the diode D3 and the output terminal of the key ignition signal; the cathode of the diode D3 is connected to the first terminal of the capacitor C2, and the second terminal of the capacitor C2 is grounded.

[0056] The function of the quick start unit is that when the speed of the magneto is relatively low, the key ignition signal is used to supply power to the board and the trigger coil. Usually, after starting, the power supply of the trigger coil will be turned off by the control of the operational amplifier, and the magneto runs independently for ignition. After starting the fire through the key ignition signal, the board is powered by the diode D3; it should be noted that the cathode of the diode D3 is also connected to the board to supply power to the board.

[0057] It should be further noted that during the process of turning the key to ignite, the right side of the diode D4 is 12V, resulting in a high output of the operational amplifier U4. At this time, because the speed is relatively low, the output voltage of the frequency-voltage conversion module is relatively low, resulting in a high output of the operational amplifier U2. Therefore, the output of the operational amplifier U3 is high, and the NPN transistor Q2 conducts to supply power to the trigger coil, and there will be no problem of unsmooth ignition at low starting speeds. When the speed is high to a certain extent, the analog voltage output by the frequency-voltage conversion module causes the output of the operational amplifier U2 to become low, and after the ignition signal disappears, the output of the operational amplifier U4 is also low. Therefore, the output of the operational amplifier U3 is low, and it operates normally at this time.

[0058] After starting the fire with the key ignition signal, the resistor R17 and the resistor R18 are connected through the diode D4 for voltage division and then connected to the non-inverting input terminal of the operational amplifier U4. The inverting input terminal of the operational amplifier U4 is provided with a stable potential after voltage division by the resistor R16 and the resistor R15. Therefore, after the key ignition signal, the potential of the non-inverting input terminal of the operational amplifier U4 is greater than the potential of the inverting input terminal of the operational amplifier U4. Therefore, the output terminal of the operational amplifier U4 outputs a high level. Because the rotational speed of the magneto is relatively low, the potential of the inverting input terminal of the operational amplifier U2 is less than the potential of the non-inverting input terminal of the operational amplifier U2, and the output terminal of the operational amplifier U2 outputs a high level. At this time, the potential of the non-inverting input terminal of the operational amplifier U3 is greater than the potential of the inverting input terminal of the operational amplifier U2. Therefore, the output terminal of the operational amplifier U3 outputs a high level, the NPN-type triode Q2 conducts, the trigger coil supplies power to the board, and the magneto starts. Then the rotational speed of the magneto increases, the voltage of the inverting input terminal of the operational amplifier U2 becomes larger, the level output by the output terminal of the operational amplifier U2 changes from a high level to a low level. At this time, the level of the non-inverting input terminal of the operational amplifier U3 is less than the level of the inverting input terminal of the operational amplifier U3, and the output of the output terminal of the operational amplifier U3 becomes a low level. At this time, the NPN-type triode Q2 is cut off, and the power supply of the trigger coil operates independently with the electric energy obtained by cutting the magnetic force line by itself.

[0059] It should be noted that the power supply of the trigger coil is installed on the magneto. When the permanent magnet on the flywheel rotates to cut the power supply of the trigger coil to generate electric energy, an ignition signal will be given to the module for ignition when it reaches a predetermined position. Therefore, when the rotational speed is low, the power supply of the trigger coil cannot generate the required electric energy for ignition.

[0060] Furthermore, as a refinement and extension of the specific implementation manner of the above embodiment, in order to completely illustrate the specific implementation process in this embodiment, another ignition circuit is provided. The ignition circuit further includes an emergency stop unit, and the emergency stop unit includes an emergency stop button and a resistor R2.

[0061] The first end of the resistor R2 is respectively connected to the first end of the high-voltage capacitor C1 and the anode of the thyristor SCR1.

[0062] The second end of the resistor R2 is connected to the emergency stop button. The emergency stop button generates an emergency stop signal, which is connected to the anode of the thyristor SCR1 through the first end of the resistor R2, thereby controlling the thyristor SCR1 to turn off, so as to stop releasing the energy stored in the high-voltage capacitor C1 to the high-voltage package spark plug, and thus achieve fire extinguishing.

[0063] Based on the above embodiments, in order to further improve the power supply range provided by the above embodiments, as an implementable manner, in one embodiment, the rectification unit further includes a bridge rectifier D2, an NPN transistor Q3, a zener diode DZ1, a current-limiting resistor R22, and a capacitor C3.

[0064] The first input terminal and the second input terminal of the bridge rectifier D2 are both connected to the output terminal of the magneto.

[0065] The first input terminal of the bridge rectifier D2 is grounded, the second input terminal of the bridge rectifier D2 is connected to the collector of the NPN transistor Q3, and the emitter of the NPN transistor Q3 is connected to the power output.

[0066] The base of the NPN transistor Q3 is respectively connected to the first end of the zener diode DZ1 and the first end of the current-limiting resistor R22.

[0067] The second end of the zener diode DZ1 is grounded, the second end of the current-limiting resistor R22 is connected to the first end of the capacitor C3, and the second end of the capacitor C3 is grounded.

[0068] The rectification unit converts the alternating current generated by the magneto into direct current. One path passes through the linear voltage regulation circuit composed of the transistor Q3, the zener diode DZ1, the capacitor C3, and the resistor R22, and the power output of the NPN transistor Q3 supplies power to other modules.

[0069] It should be further noted that the bridge rectifier D1 is composed of four rectifier diodes, and the bridge rectifier D2 is composed of four rectifier diodes.

[0070] Those of ordinary skill in the art can realize that the units and algorithm steps of each example described in combination with the embodiments disclosed herein can be implemented by electronic hardware, computer software, or a combination of the two. To clearly illustrate the interchangeability of hardware and software, the composition and steps of each example have been generally described according to functions in the above description. Whether these functions are executed in a hardware or software manner depends on the specific application and design constraints of the technical solution. Professional technicians can use different methods to implement the described functions for each specific application, but such implementation should not be considered to exceed the scope of the present invention.

[0071] The flowcharts and block diagrams in the accompanying drawings illustrate the possible architectures, functions, and operations of devices, methods, and computer program products according to various embodiments of the present disclosure. In this regard, each block in the flowchart or block diagram may represent a module, a segment of a program, or a part of code that contains one or more executable instructions for implementing a specified logical function. It should also be noted that in some alternative implementations, the functions marked in the blocks may occur in a different order than that marked in the accompanying drawings. Exemplarily, two consecutive blocks shown may actually be executed substantially in parallel, and they may sometimes be executed in the reverse order, depending on the functions involved. It should also be noted that each block in the block diagram and / or flowchart, and combinations of blocks in the block diagram and / or flowchart, may be implemented by a dedicated hardware-based system that performs the specified functions or operations, or may be implemented by a combination of dedicated hardware and computer instructions.

[0072] In several embodiments provided in the present application, it should be understood that the disclosed systems, devices, and methods may be implemented in other ways. For example, the device embodiments described above are merely illustrative. For example, the division of the units is only a logical function division, and there may be other division methods in actual implementation. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Additionally, the couplings, direct couplings, or communication connections shown or discussed among each other may be indirect couplings or communication connections through some interfaces, devices, or units, and may also be in electrical, mechanical, or other forms of connection.

[0073] Furthermore, the described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments. In the following description, numerous specific details are provided to give a thorough understanding of the embodiments of the present invention. However, those skilled in the art will realize that the technical solutions of the present invention may be practiced without one or more of the specific details, or may be implemented using other methods, components, devices, steps, etc. In other cases, well-known methods, devices, implementations, or operations are not shown or described in detail to avoid obscuring aspects of the present invention.

[0074] The above description of the disclosed embodiments enables those 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 will not be limited to the embodiments shown herein, but rather to the broadest scope consistent with the principles and novel features disclosed herein.

[0075] For those of ordinary skill in the art, according to the teachings of the present invention, it does not require creative labor to design control circuits in different forms. These changes, modifications, substitutions, and variations to the embodiments still fall within the protection scope of the present invention without departing from the principles and spirit of the present invention.

Claims

1. An outboard CDI ignition circuit, characterized in that: The ignition circuit includes a magneto, a rectifier unit, a high-voltage capacitor C1, an ignition unit and a speed control unit; The output end of the magnetic motor is connected to the rectifier unit, the output end of the rectifier unit is connected to the first end of the high-voltage capacitor C1, the second end of the high-voltage capacitor C1 is connected to the ignition unit, and the speed control unit is respectively connected to the second end of the high-voltage capacitor C1 and the ignition unit.

2. The ignition circuit according to claim 1, characterized in that: The rectifier unit includes a bridge rectifier D1; The first input end of the bridge rectifier D1 and the second input end of the bridge rectifier D1 are both connected to the output end of the magnetic motor, the first output end of the bridge rectifier D1 is grounded, the second output end of the bridge rectifier D1 is connected to the first end of the high-voltage capacitor C1, and the second end of the high-voltage capacitor C1 is grounded.

3. The ignition circuit according to claim 2, characterized in that: The ignition unit includes a thyristor SCR1, a high-voltage spark plug, a resistor R1 and a trigger coil; The anode of the thyristor SCR1 is connected to the first end of the high-voltage capacitor C1; the control electrode of the thyristor SCR1 is connected to the first end of the resistor R1, and the second end of the resistor R1 is connected to the trigger coil; the cathode of the thyristor SCR1 is connected to the first end of the high-voltage spark plug, and the second end of the high-voltage spark plug is grounded.

4. The ignition circuit according to claim 3, characterized in that: The ignition circuit further includes a temperature detection unit, which includes a temperature sensor, and the temperature sensor is placed on a cylinder block of the engine.

5. The ignition circuit according to claim 4, characterized in that: The temperature detection unit also includes a resistor R19, a resistor R20, a thyristor output optical coupler OP1 and a resistor R21; The first end of the resistor R19 is connected to the temperature sensor and the first input end of the thyristor output optocoupler OP1 respectively; the second end of the resistor R19 is connected to the first end of the resistor R20 and the second input end of the thyristor output optocoupler OP1 respectively; The first output end of the thyristor output optical coupler OP1 is connected to the input end of the speed control unit, and the output end of the speed control unit is respectively connected to the first end of the high-voltage capacitor C1 and the anode of the thyristor SCR1; The second output end of the thyristor output optocoupler OP1 is connected to the first end of the resistor R21 , and the second end of the resistor R21 is grounded.

6. The ignition circuit according to claim 5, characterized in that The speed control unit includes a resistor R3, a thyristor SCR2, a resistor R4, a PNP transistor Q1, a resistor R5, an operational amplifier U1, a frequency-to-voltage converter, a resistor R6, a resistor R7, a resistor R8, a resistor R9 and a resistor R10; The first end of the resistor R3 is connected to the first end of the high voltage capacitor C1 and the anode of the thyristor SCR1 respectively; The second end of the resistor R3 is connected to the anode of the thyristor SCR2, and the cathode of the thyristor SCR2 is grounded; The control electrode of the thyristor SCR2 is connected to the first end of the resistor R4, the second end of the resistor R4 is connected to the collector of the PNP transistor Q1, the base of the PNP transistor Q1 is connected to the first end of the resistor R5, and the second end of the resistor R5 is respectively connected to the output end of the operational amplifier U1 and the first end of the resistor R6; The inverting input terminal of the operational amplifier U1 is connected to the frequency-to-voltage converter, and the non-inverting input terminal of the operational amplifier U1 is respectively connected to the second end of the resistor R6, the first end of the resistor R7 and the first end of the resistor R8; the second end of the resistor R8 is grounded; The second end of the resistor R6 is also connected to the first end of the resistor R7, the first end of the resistor R8 and the first end of the resistor R9 respectively; the second end of the resistor R9 is connected to the first end of the resistor R10, and the second end of the resistor R10 is grounded; The non-inverting input terminal of the operational amplifier U1 , the second terminal of the resistor R6 , the first terminal of the resistor R7 , and the first terminal of the resistor R8 are all connected to the first output terminal of the thyristor output optocoupler OP1 .

7. The ignition circuit according to claim 6, characterized in that The ignition circuit also includes a quick start unit, which includes an operational amplifier U2, an operational amplifier U3, an operational amplifier U4, an NPN transistor Q2, a trigger coil power supply, a key ignition signal, a resistor R11, a resistor R12, a resistor R13, a resistor R14, a resistor R15, a resistor R16, a resistor R17, a resistor R18, a diode D3, a diode D4 and a capacitor C2; The inverting input terminal of the operational amplifier U2 is respectively connected to the frequency-to-voltage converter and the inverting input terminal of the operational amplifier U1, and the non-inverting input terminal of the operational amplifier U2 is respectively connected to the first end of the resistor R10 and the second end of the resistor R9; The output end of the operational amplifier U2 is connected to the first end of the resistor R11, and the second end of the resistor R11 is respectively connected to the first end of the resistor R12, the output end of the operational amplifier U4 and the non-inverting input end of the operational amplifier U3; the second end of the resistor R12 is grounded; The inverting input terminal of the operational amplifier U3 is respectively connected to the first end of the resistor R13 and the first end of the resistor R14, and the second end of the resistor R14 is grounded; the output terminal of the operational amplifier U3 is connected to the base of the NPN transistor Q2, and the emitter of the NPN transistor Q2 is connected to the trigger coil for power supply; The inverting input terminal of the operational amplifier U4 is respectively connected to the first end of the resistor R15 and the first end of the resistor R16, and the second end of the resistor R16 is grounded; the non-inverting input terminal of the operational amplifier U4 is respectively connected to the first end of the resistor R17 and the first end of the resistor R18, and the second end of the resistor R18 is grounded; the second end of the resistor R17 is connected to the cathode of the diode D4, and the anode of the diode D4 is respectively connected to the anode of the diode D3 and the output end of the key ignition signal; the cathode of the diode D3 is connected to the first end of the capacitor C2, and the second end of the capacitor C2 is grounded.

8. The ignition circuit according to claim 7, characterized in that The ignition circuit further includes an emergency stop unit, which includes an emergency stop button and a resistor R2; The first end of the resistor R2 is respectively connected to the first end of the high voltage capacitor C1 and the anode of the thyristor SCR1; The second end of the resistor R2 is connected to the emergency stop button.

9. The ignition circuit according to claim 8, characterized in that The rectifier unit also includes a bridge rectifier D2, an NPN transistor Q3, a voltage regulator diode DZ1, a current limiting resistor R22, and a capacitor C3; The first input end of the bridge rectifier D2 and the second input end of the bridge rectifier D2 are both connected to the output end of the magnetic motor; The first input end of the bridge rectifier D2 is grounded, the second input end of the bridge rectifier D2 is connected to the collector of the NPN transistor Q3, and the emitter of the NPN transistor Q3 is connected to the power output; The base of the NPN transistor Q3 is connected to the first end of the voltage-stabilizing diode DZ1 and the first end of the current-limiting resistor R22 respectively; The second end of the voltage-limiting diode DZ1 is grounded, the second end of the current-limiting resistor R22 is connected to the first end of the capacitor C3, and the second end of the capacitor C3 is grounded.

10. The ignition circuit according to claim 9, characterized in that The bridge rectifier D1 is composed of four rectifier diodes, and the bridge rectifier D2 is composed of four rectifier diodes.

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