Alternating current ignition system with low rotating speed and high energy

Abstract

The utility model provides an alternating-current ignition system with low rotating speed and high energy. The alternating-current ignition system comprises a magneto driven by an engine to rotate, the boosted circuit comprises a driving chip and a switching tube, and the driving chip controls on and off of the switching tube to oscillate a charging coil in the magnetor, so that the voltage output by the magnetor is boosted; the input end of the control module is electrically connected with the trigger signal output end of the magneto, and the control module outputs an ignition control signal according to the trigger signal; the ignition control circuit comprises an ignition capacitor, the charging end of the ignition capacitor is electrically connected with the alternating current output end of the magneto, and the control end of the ignition capacitor is connected with the ignition control signal output end of the control module; after the ignition control circuit receives an ignition control signal output by the control module, the ignition capacitor discharges to the ground, and ignition is achieved. The ignition energy of the alternating current igniter is improved, and the ignition stability of the alternating current igniter is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of igniter, specifically relates to a low -speed high -energy alternating current ignition system. BACKGROUND

[0002] The working principle of the igniter is that the Hall sensor collects the rotating position of the magneto rotor in the engine to determine the piston movement position in the engine, and when the piston moves to the most appropriate position (generally in the compression stroke and before the piston moves to the top dead center), the igniter outputs an ignition signal, the primary coil voltage of the ignition coil (the ignition coil is actually a self-coupling step-up transformer) suddenly changes, and then the secondary coil of the ignition coil induces high voltage through the sudden change of the primary coil voltage, and the high voltage of the secondary coil discharges to the ground to break through the mixed air and ignite.

[0003] The alternating current igniter used in the market today is not stable enough because the voltage is limited by the engine speed, and the ignition energy is relatively weak at low speed, so it is difficult to start and the minimum continuous ignition speed is high, which has a great influence on the vehicle start, especially in winter when the outdoor temperature is low, the energy is insufficient and the start is difficult. CONTENT OF THE UTILITY MODEL

[0004] In order to overcome the defects in the prior art, the purpose of the utility model is to provide a low-speed high-energy alternating current ignition system.

[0005] In order to achieve the above purpose of the utility model, the utility model provides a low-speed high-energy alternating current ignition system, which comprises a magneto driven to rotate by an engine, and further comprises:

[0006] The boost circuit comprises a drive chip and a switch tube, the drive chip is connected with the switch tube in control, the switch tube is electrically connected with the alternating current output end of the magneto, and the drive chip controls the opening and closing of the switch tube to oscillate the charging coil in the magneto, so that the voltage output by the magneto is increased;

[0007] The control module is electrically connected with the trigger signal output end of the magneto at the input end, and the control module outputs an ignition control signal according to the trigger signal;

[0008] The ignition control circuit comprises an ignition capacitor, the charging end of the ignition capacitor is electrically connected with the alternating current output end of the magneto, the control end is connected with the ignition control signal output end of the control module, and when the ignition control circuit receives the ignition control signal output by the control module, the ignition capacitor discharges to the ground to realize ignition;

[0009] The power supply circuit is electrically connected with each power module and supplies power to the whole alternating current ignition system.

[0010] The low-rotating-speed high-energy AC ignition system increases a voltage boosting circuit after the magnetic motor is powered, and the voltage boosting circuit realizes self-boosting oscillation of the ignition voltage by controlling high-speed opening and high-speed closing of a switching tube, boosting the ignition voltage, thereby improving the ignition energy of the AC igniter and enabling the AC igniter to normally ignite in a low-temperature special environment.

[0011] Optionally, the voltage boosting circuit further comprises a switching triode and a charge-discharge module.

[0012] The S pole of the switching tube is connected to a current-limiting resistor and then grounded, the D pole of the switching tube is connected to the AC output end of the magnetic motor through a first rectifier diode, and the G pole of the switching tube is connected to the output end of the driving chip.

[0013] The S pole of the switching tube is also connected to the charge-discharge module, the charge-discharge module is also connected to the base of the switching triode, the collector of the switching triode is electrically connected to the input end of the driving chip and the power supply circuit, and the emitter of the switching triode is grounded.

[0014] Optionally, the charge-discharge module comprises a twenty-second resistor, a twenty-third resistor and a charge-discharge capacitor, one end of the twenty-second resistor and the twenty-third resistor is connected to the S pole of the switching tube, the other end of the twenty-third resistor is grounded, the other end of the twenty-second resistor is connected to the charge-discharge end of the charge-discharge capacitor, and the charge-discharge end of the charge-discharge capacitor is also connected to the base of the switching triode.

[0015] Optionally, the voltage boosting circuit further comprises a voltage stabilizing module, which is electrically connected between the base of the switching triode and the AC output end of the magnetic motor. In this optional scheme, the voltage stabilizing module stabilizes the voltage output by the magnetic motor.

[0016] Optionally, the ignition control circuit comprises an ignition capacitor and a thyristor.

[0017] The output end of the voltage boosting circuit is electrically connected to the charge end of the ignition capacitor, and the discharge end of the ignition capacitor is electrically connected to the ignition coil.

[0018] The ignition control signal output end of the control module is electrically connected to the control end of the thyristor, the anode of the thyristor is electrically connected to the output end of the voltage boosting circuit, and the cathode of the thyristor is grounded.

[0019] Optionally, a sensor is arranged on the magnetic motor, which is used to collect a position signal of the rotation of the rotor of the magnetic motor and output the position signal as the trigger signal.

[0020] The utility model discloses the beneficial effect is:

[0021] The voltage output by the magneto is boosted through the boosting circuit part added after the magneto is powered, the ignition energy of the AC igniter is improved, the stability of the AC igniter ignition is improved, and the problem of difficult starting of the whole vehicle under low temperature special environment is solved.

[0022] Additional aspects and advantages of the present application will be described in the following description, become apparent from it, or be learned by practice of the present application. BRIEF DESCRIPTION OF DRAWINGS

[0023] The above and / or additional aspects and advantages of the present application will become apparent and be readily understood from the following description, taken in conjunction with the accompanying drawings, in which:

[0024] Figure 1 is a schematic diagram of the principle of the present application;

[0025] Figure 2 is a circuit schematic diagram of the shaping circuit;

[0026] Figure 3 is a circuit schematic diagram of the control module;

[0027] Figure 4 is a circuit connection schematic diagram between the power supply module, the boosting circuit, the ignition control circuit and the extinguishing control circuit;

[0028] Figure 5 is a circuit schematic diagram of the speed output circuit. DETAILED DESCRIPTION

[0029] The embodiments of the present application will be described in detail below, examples of which are shown in the drawings, wherein the same or similar reference signs represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary and are only used to explain the present application, and cannot be understood as a limitation of the present application.

[0030] In the description of the present application, unless otherwise specified and limited, it is necessary to explain that the terms "mounting", "connection" and "connection" should be understood broadly, for example, it can be mechanical connection or electrical connection, or the communication between two elements, or direct connection, or indirect connection through intermediate medium. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.

[0031] As shown in Figure 1 The utility model provides a low -speed high -energy AC ignition system, including magneto, boosting circuit, control module, ignition control circuit, power supply circuit, shaping circuit and extinguishing circuit.

[0032] The power supply circuit is electrically connected with each power module to supply power for the whole alternating current ignition system. The magneto is driven to rotate by the engine to output alternating current. The voltage boosting circuit comprises a driving chip and a switch tube, the driving chip is in control connection with the switch tube, the switch tube is electrically connected with the alternating current output end of the magneto, and the driving chip controls the opening and closing of the switch tube to oscillate the charging coil in the magneto to increase the voltage output by the magneto. The ignition control circuit comprises an ignition capacitor, the charging end of the ignition capacitor is electrically connected with the alternating current output end of the magneto, and the control end of the ignition control circuit is connected with the ignition control signal output end of the control module. A sensor is arranged on the magneto to collect the rotating position of the rotor of the magneto and output as a trigger signal, the trigger signal is input to the control module after being shaped by the shaping circuit, and the control module outputs the ignition control signal to the control end of the ignition control circuit according to the trigger signal. After receiving the ignition control signal, the ignition capacitor is discharged to the ground to realize ignition.

[0033] In the embodiment, the trigger signal comprises a positive pulse signal and a negative pulse signal, one positive pulse signal and one negative pulse signal are output when the rotor of the magneto rotates one circle. Figure 2 As shown in the figure, the shaping circuit comprises a positive pulse shaping circuit and a negative pulse shaping circuit. The input end of the positive pulse shaping circuit is connected with the trigger signal output end of the sensor through the first resistor R1, specifically comprising a first capacitor C1 and a second resistor R2 in parallel, further comprising a first transistor Q1, the input end of the first capacitor C1 and the second resistor R2 is connected with the first resistor R1, the output end of the first capacitor C1 and the second resistor R2 is connected with the base of the first transistor Q1, the collector of the first transistor Q1 is connected with the power supply, further connected with a fifth resistor R5, the other end of the fifth resistor R5 outputs the shaped trigger signal to the control module, a sixth capacitor C6 is connected in series between the other end of the fifth resistor R5 and the ground, and the emitter of the first transistor Q1 is grounded. The input end of the negative pulse shaping circuit is connected with the trigger signal output end of the sensor through the first resistor R1, specifically comprising a third capacitor C3 and a fourth resistor R4 in parallel, further comprising a second transistor Q2, the input end of the third capacitor C3 and the fourth resistor R4 is connected with the first resistor R1, the output end of the third capacitor C3 and the fourth resistor R4 is connected with the emitter of the second transistor Q2, the base of the second transistor Q2 is grounded, the collector of the second transistor Q2 is connected with the power supply, further connected with a seventh resistor R7, the other end of the seventh resistor R7 outputs the shaped trigger signal to the control module, and an eighth capacitor C8 is connected in series between the other end of the seventh resistor R7 and the ground.

[0034] As shown in the figure, Figure 3 The control module comprises a control chip U1, the 2th pin and the 3th pin of the control chip U1 receive the trigger signal output by the shaping circuit.

[0035] As shown in the figure, Figure 4The switch tube in the voltage boosting circuit is MOS tube Q6, and the voltage boosting circuit further comprises driving chip U3, switching triode Q5 and voltage stabilizing module. The S pole of MOS tube Q6 is connected to current-limiting resistor R24 and then to ground, the D pole thereof is connected to the AC output end of the magneto after passing through first rectifier diode D1, and the G pole thereof is connected to the OUT end of the driving chip U3; the S pole of MOS tube Q6 is further connected to one end of twenty-second resistor R22 and twenty-third resistor R23, the other end of the twenty-third resistor R23 is connected to ground, the other end of the twenty-second resistor R22 is connected to charge-discharge capacitor C18 and the base of switching triode Q5, the collector of the switching triode Q5 is electrically connected to the input end of the driving chip U3 and the power supply circuit, the emitter thereof is connected to ground, and a filter capacitor C16 is further connected between the collector and the emitter of the switching triode Q5; the base of the switching triode Q5 is further connected to the voltage stabilizing module, and the output end of the voltage stabilizing module is connected to the AC output end of the magneto. The twenty-second resistor R22, the twenty-third resistor R23 and the charge-discharge capacitor C18 constitute a charge-discharge module, and the voltage stabilizing module is composed of fourth voltage stabilizing diode DW4, fifth voltage stabilizing diode DW5 and sixth voltage stabilizing diode DW6.

[0036] When the base of the switching triode Q5 is high level, the switching triode Q5 is opened as a switch, the voltage at the collector of Q5 is pulled low, the OUT end of the driving chip U3 outputs low level through the driving chip U3, MOS tube Q6 is cut off, at this time, the charge-discharge capacitor C18 is discharged through the twenty-second resistor R22 and the twenty-third resistor R23, when the voltage of the charge-discharge capacitor C18 is lower than the opening voltage of the switching triode Q5, the switching triode Q5 is closed as a switch, at this time, the voltage at the collector of the switching triode Q5 is high level, the OUT end of the driving chip U3 outputs high level through the driving chip U3, MOS tube Q6 is turned on, the charge-discharge capacitor C18 is charged through the twenty-second resistor R22, so that the base of the switching triode Q5 is high level. The cut-off of MOS tube Q6 by the driving chip U3 oscillates the charging coil in the magneto, so that the output voltage of the magneto is increased.

[0037] As Figure 4As shown, the ignition control circuit includes ignition capacitor C5, 26th resistor R26, 25th resistor R25, 4th capacitor C4, SCR3, 9th diode D9, and 10th diode D10. The output terminal of the voltage regulator module of the boost circuit is electrically connected to the charging terminal of ignition capacitor C5, and the discharging terminal of ignition capacitor C5 is electrically connected to the ignition coil. The ignition control signal output terminal OUT of the control module is connected to the positive terminal of the 9th diode D9. The negative terminal of the 9th diode D9 is connected to one end of the 26th resistor R26, and the other end of the 26th resistor R26 is connected to the control terminal of the SCR3. The anode of the SCR3 is connected to the output terminal of the voltage regulator module of the boost circuit, and the cathode of the SCR3 is grounded. The other end of the 26th resistor R26 is also connected to one end of the 4th capacitor C4 and one end of the 25th resistor R25. The other ends of the 4th capacitor C4 and the 25th resistor R25 are both grounded. The 10th diode D10 is connected between ignition capacitor C5 and ground.

[0038] Control Principle: The magneto is driven by the low-speed rotation of the engine to generate electricity, which outputs AC power. Through the high-speed switching of MOSFET Q6 in the boost circuit, the ignition voltage is boosted by the bootstrap oscillation. When the control module does not receive the ignition trigger signal, it does not output the ignition control signal to the ignition control circuit, and the thyristor SCR3 is turned off, so that the high voltage output by the boost circuit charges the ignition capacitor C5. When the control module receives the ignition trigger signal, it outputs an ignition control signal to the ignition control circuit, controlling the turn-on of the SCR3. The ignition capacitor C5 is connected to ground via the SCR3, discharging to ground. The discharge current passes through the ignition coil, generating a high-voltage pulse, causing a sudden voltage change in the primary coil voltage of the ignition coil (the ignition coil is essentially an autotransformer). Then, the secondary coil of the ignition coil induces a high voltage through the voltage change in the primary coil. The secondary high voltage discharges to ground, breaking down the air mixture and igniting the flame. When flameout is required, the flameout control circuit connected to the power supply circuit is short-circuited to ground, thus extinguishing the flameout. Typically, a conventional related circuit can be used for the flameout control circuit.

[0039] like Figure 4 As shown, the flameout control circuit in this embodiment includes another silicon controlled rectifier (SCR1), a fifteenth resistor (R15), a sixteenth resistor (R16), a seventeenth resistor (R17), a fourteenth capacitor (C14), a sixth diode (D6), and a fourth transistor (Q4). The flameout switch is connected to this control circuit and is grounded. To extinguish the flame, simply close the flameout switch.

[0040] This embodiment also includes a speed output circuit electrically connected to the speed output terminal of the control module, such as... Figure 5As shown, for sending the rotating speed of the magneto to the control center of the whole vehicle, and the rotating speed of the magneto can be calculated according to the above positive pulse signal and negative pulse signal by the control module according to the existing method, which will not be described here.

[0041] In the description of the present specification, the description of the terms "one embodiment", "some embodiments", "an example", "a specific example", or "some examples" and the like means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the illustrative description of the above terms does not necessarily mean the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0042] Although the embodiments of the present application have been shown and described, those skilled in the art can understand that various changes, modifications, replacements and variations can be made to the embodiments without departing from the principles and purposes of the present application, and the scope of the present application is defined by the claims and their equivalents.

Claims

1. A low speed high energy AC ignition system comprising a magneto driven by rotation of an engine, characterised in that, Also include: The boost circuit includes a drive chip and a switch tube, the drive chip and the switch tube control connection, the switch tube and the AC output end of the magneto electrically connected, the drive chip control switch tube opening and closing to the charging coil in the magneto oscillation, make the voltage of magneto output rise; The control module is electrically connected with the trigger signal output end of the magneto, and the control module outputs the ignition control signal according to the trigger signal; Ignition control circuit, including ignition capacitor, the charging end of the ignition capacitor and the AC output end of the magneto are electrically connected, and the control end of the ignition capacitor is connected with the ignition control signal output end of the control module; when the ignition control circuit receives the ignition control signal output by the control module, the ignition capacitor discharges to the ground, and ignition is realized; The power supply circuit is electrically connected with each power module, and supplies power for the whole AC ignition system.

2. The low-rotation high-energy AC ignition system according to claim 1, characterized by, The boost circuit further comprises a switching triode and a charge-discharge module; The S pole of the switch tube is connected with a current limiting resistor and then grounded, the D pole of the switch tube is connected with the AC output end of the magneto through a first rectifier diode, and the G pole of the switch tube is connected with the output end of the drive chip; The S pole of the switch tube is also connected with the charge-discharge module, the charge-discharge module is also connected with the base of the switching triode, the collector of the switching triode is electrically connected with the input end of the drive chip and the power supply circuit, and the emitter of the switching triode is grounded.

3. The low-rotational-speed high-energy AC ignition system according to claim 2, wherein The charge-discharge module comprises a twenty-second resistor, a twenty-third resistor and a charge-discharge capacitor, one end of the twenty-second resistor and the twenty-third resistor is connected with the S pole of the switch tube, the other end of the twenty-third resistor is grounded, the other end of the twenty-second resistor is connected with the charge-discharge end of the charge-discharge capacitor, and the charge-discharge end of the charge-discharge capacitor is also connected with the base of the switching triode.

4. The low speed high energy AC ignition system of claim 2, wherein, The boost circuit further comprises a voltage stabilizing module, which is electrically connected between the base of the switching triode and the AC output end of the magneto.

5. The low speed high energy AC ignition system of claim 1, wherein, The ignition control circuit comprises an ignition capacitor and a thyristor; The output end of the boost circuit is electrically connected with the charging end of the ignition capacitor, and the discharging end of the ignition capacitor is electrically connected with the ignition coil; The ignition control signal output end of the control module is electrically connected with the control end of the thyristor, the anode of the thyristor is electrically connected with the output end of the boost circuit, and the cathode of the thyristor is grounded.

6. The low speed high energy AC ignition system of claim 1, wherein, The magneto is provided with a sensor for collecting the position signal of the rotor of the magneto and outputting the trigger signal.

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