Automobile ignition coil and its ignition controller

Abstract

The present invention discloses an automotive ignition coil and its ignition controller, and the technical solution is as follows: An energy storage module is arranged on the main housing, and the energy storage module is electrically connected in parallel with the primary coil. When the primary coil is connected to a DC power supply, the energy storage module and the primary coil respectively store electric field energy and magnetic field energy synchronously. There is an inversion circuit electrically connected between the energy storage module and the primary coil. When the inversion circuit responds to the disconnection of the DC power supply and the primary coil, it connects the energy storage module and the primary coil to provide a reverse voltage that is reversely transmitted to the primary coil, and the magnitude of the reverse voltage is equal to the self-inductive voltage generated by the primary coil. Through energy storage components, the present invention realizes that when the coil is powered off, the self-inductive voltage generated by the inductance is offset by the reverse current voltage, thereby achieving the effect of quickly eliminating the magnetic field, realizing the instantaneous disappearance of the magnetic field in the primary coil, demagnetizing the iron core, and the magnetic force lines rapidly contracting and cutting the secondary coil to generate high voltage for ignition operation.

Description

Technical Field

[0001] The present invention relates to DC power supply technology, and more particularly to an automotive ignition coil and its ignition controller. Background Art

[0002] Although the ignition coil is a relatively small component of an automobile, its importance cannot be ignored. The ignition coil is indispensable for starting and running an automobile. Its function is to convert the low voltage of the automobile into high voltage to ensure the basic voltage for the operation of the automobile, and to achieve the effect of DC high voltage through the inversion process. Its working principle is as follows: When the primary coil is connected to the power supply, a strong magnetic field is generated around it as the current increases, and the iron core stores magnetic field energy; when the switch device disconnects the primary coil circuit, the magnetic field of the primary coil rapidly decays, and a very high voltage is induced in the secondary coil.

[0003] The faster the magnetic field of the primary coil disappears, the greater the current at the moment of current disconnection, and the greater the turn ratio of the two coils, the higher the voltage induced in the secondary coil. This high voltage will ultimately be transmitted to the spark plug to jump the spark and break down and ignite the combustible mixture. Thus, the huge gas thrust generated by the ignition of the combustible mixture will push the piston to do work.

[0004] Therefore, a new solution is needed to solve this problem. Summary of the Invention

[0005] Aiming at the deficiencies of the prior art, the purpose of the present invention is to provide.

[0006] The above technical purpose of the present invention is achieved through the following technical solutions: An automotive ignition coil includes a main housing, an iron core, a primary coil, a secondary coil, and a spark plug. A energy storage module is provided on the main housing, and the energy storage module is electrically connected in parallel with the primary coil. When the primary coil is connected to a DC power supply, the energy storage module and the primary coil synchronously store electric field energy and magnetic field energy respectively. A flip circuit is electrically connected between the energy storage module and the primary coil. When the flip circuit responds to the disconnection of the DC power supply and the primary coil, it connects the energy storage module and the primary coil, providing a reverse voltage that is reversely transmitted to the primary coil, and the magnitude of the reverse voltage is equal to the self-inductance voltage generated by the primary coil.

[0007] Through the above technical solution, the primary coil and the secondary coil arranged in the main housing achieve that when the primary coil is powered off, the induced magnetic field generated by it disappears. Since the secondary coil is located within the induced magnetic field, when the induced magnetic field disappears, an induced current and a high-voltage are generated in the secondary coil by "cutting" the induced magnetic field. This high-voltage is transmitted to the spark plug to cause a spark discharge and break down and ignite the combustible mixture. In this application, by setting up an energy storage module to perform synchronous energy storage when the DC power supply supplies power to the primary coil, a rated energy storage voltage is formed across the energy storage module. And through the set flip circuit, when the DC power supply disconnects the power supply to the primary coil, the energy storage voltage stored in the energy storage module in the previous stage is supplied to the primary coil in the opposite phase, which cancels out the self-induced voltage generated by the primary coil when the DC power supply weakens, thereby accelerating the demagnetization rate of the primary coil, further accelerating the demagnetization of the primary coil, equivalently increasing the rate of the secondary coil "cutting" the magnetic induction, increasing the voltage of the secondary coil, and efficiently realizing the ignition operation.

[0008] The present invention is further configured as: the energy storage module includes an energy storage capacitor and a voltage-dividing resistor connected in parallel with the energy storage capacitor, and both the energy storage capacitor and the voltage-dividing resistor are connected in parallel with the primary coil.

[0009] Through the above technical solution, by setting up an energy storage capacitor, due to the characteristic of the energy storage capacitor of blocking direct current and conducting alternating current, when the DC power supply supplies power, it hinders the flow of direct current and accumulates charges at both ends of the energy storage capacitor to form a potential difference. The parallel-connected voltage-dividing resistor allows the DC power supply to flow through and protects the energy storage capacitor. Furthermore, the potential difference across the energy storage capacitor is the same as the potential difference across the voltage-dividing resistor.

[0010] The present invention is further configured as: the energy storage module further includes a micro current relay and a relay switch. The relay switch includes a normally open switch, and the normally open switch is connected in series with the voltage-dividing resistor.

[0011] Through the above technical solution, the energy storage module is provided with a micro current relay and a relay switch. The setting of the micro current relay enables it to be powered on and work when the DC power supply supplies power to the primary coil, and the normally open switch is triggered to close. Since the normally open switch is connected in series with the voltage-dividing resistor, when the primary coil is powered, the resistor is simultaneously turned on to charge the energy storage capacitor.

[0012] The present invention is further configured as: the flip circuit includes four diodes, and the four diodes are electrically connected in sequence to form a bridge circuit. The common ends of the adjacent diodes facing each other or back to back are respectively electrically connected to both ends of the energy storage capacitor.

[0013] Through the above technical solution, the inversion circuit adopts a bridge circuit composed of four diodes, which can realize the energy storage power supply to the primary coil and the energy storage capacitor when powered by a DC power supply. When the DC power supply is powered off, the energy storage capacitor can supply power to the primary coil in the reverse direction through the bridge circuit, thereby hindering the self-induced voltage of the primary coil, so as to achieve the purpose of improving the rapid magnetic decay of the magnetic field.

[0014] The present invention is further configured as: the relay switch further includes a normally closed switch, and the normally closed switch is electrically connected to the output ends of the energy storage capacitor and the primary coil. When the DC power supply is disconnected from the primary coil, the normally closed switch is closed to short-circuit the positive pole of the energy storage capacitor and the output end of the primary coil, providing the potential voltage at the output end of the primary coil.

[0015] Through the above technical solution, by means of the provided normally closed switch, when the micro current relay is powered off, the energy storage capacitor and the primary coil are connected through the normally closed switch. As a further insurance, the charge stored in the energy storage capacitor is supplied to the primary coil in the reverse direction. Even when the voltage stored in the energy storage capacitor is less than the conduction voltage of the diode, the primary coil can still be supplied with power in the reverse direction.

[0016] The present invention is further configured as: the energy storage power of the primary coil is W = 1 / 2 * L * I 2 , the energy storage power of the energy storage capacitor is W = 1 / 2 * C * U2, and the capacitance value of the energy storage capacitor is C = U2 / (L * I 2 ).

[0017] Through the above technical solution, due to the energy storage power of the capacitor and the primary coil, when calculating that the energy storage power of the energy storage capacitor is equal to the power of the primary coil, a reasonable selection of the capacitance of the energy storage capacitor can be realized according to the inductance coefficient of the primary coil.

[0018] The ignition controller of the automotive ignition coil includes an automotive ignition coil, and further includes:

[0019] A Hall sensor is provided on one side of the iron core and outputs a pulse signal matching the magnetic field change rate in response to the increase or disappearance of the magnetic field of the primary coil or the secondary coil;

[0020] A pulse detection circuit is connected to the Hall sensor and is used to receive the pulse signal to detect the period or frequency of the output pulse and display the magnetic decay rate of the coil.

[0021] Through the above technical solution, the Hall sensor can be used to sense the increase and attenuation of the magnetic fields generated by the primary coil and the secondary coil. While the magnetic field changes, a corresponding current signal is output, and the pulse detection circuit is used to detect the period or frequency of the generated current, thereby realizing the detection of the ignition coil during the production and maintenance processes, with good efficiency and accuracy. Moreover, during the vehicle use process, by collecting and judging the period and frequency, the monitoring of the ignition coil condition faults can be achieved.

[0022] The present invention is further configured as: further comprising a modulation circuit connected to the automotive ignition coil, and the modulation circuit is used to modulate the magnitude of the reverse voltage.

[0023] Through the above technical solution, by setting the modulation circuit, even under the differences in winding and material of the primary coil during the production process, the charge stored in the energy storage module can still be adjusted, thereby balancing the energy storage capacitor and the primary coil, ensuring the efficiency of the magnetic decay of the primary coil, so as to achieve that the secondary coil can quickly generate a higher high-voltage to make the spark plug jump and break down to ignite the combustible mixture.

[0024] The present invention is further configured as: the modulation circuit includes a tunable capacitor connected in parallel with the energy storage capacitor, and the minimum capacitance of the tunable capacitor is greater than or equal to the capacitance of the energy storage capacitor.

[0025] Through the above technical solution, by adjusting the capacitance value of the capacitor, the balance point can be directly and efficiently adjusted.

[0026] The present invention is further configured as: the modulation circuit includes a voltage dividing circuit composed of several fixed resistors, the voltage dividing circuit is connected in series with the energy storage capacitor to the ground, the output end of the primary coil is coupled to the potential point of the adjacent fixed resistor, and a tunable resistor is connected in series in the voltage dividing circuit.

[0027] Through the above technical solution, by means of voltage division, the potential can also be adjusted at a lower cost, and the adjustment of the resistor is more stable.

[0028] In summary, the present invention has the following beneficial effects:

[0029] The primary coil and the secondary coil arranged in the main shell realize that when the primary coil is powered off, the induced magnetic field generated by it disappears. Since the secondary coil is located in the induced magnetic field, when the induced magnetic field disappears, the secondary coil "cuts" the induced magnetic field to generate an induced current and a high voltage. The high voltage is transmitted to the spark plug to spark and break down and ignite the combustible mixed gas. In the present application, an energy storage module is arranged to store energy synchronously when a DC power supply is supplied to the primary coil, and a rated energy storage voltage is formed at both ends of the energy storage module. Moreover, through the set flip circuit, when the DC power supply is disconnected from the primary coil, the energy storage voltage stored in the energy storage module in the early stage is reversely supplied to the primary coil, and the self-inductance voltage generated by the primary coil when the DC power supply is reduced is offset by each other, thereby accelerating the demagnetization rate of the primary coil, and further accelerating the demagnetization of the primary coil, increasing the rate at which the secondary coil "cuts" the magnetic induction in disguised form, and increasing the voltage of the secondary coil, so that the ignition operation can be efficiently realized. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0031] Figure 1 It is a structural schematic diagram of the present invention;

[0032] Figure 2 It is a structural schematic diagram of the iron core in the present invention;

[0033] Figure 3 This is a circuit diagram of Embodiment 1 of the present invention;

[0034] Figure 4 This is a circuit diagram of Embodiment 2 of the present invention;

[0035] Figure 5 This is a circuit diagram of Embodiment 3 of the present invention.

[0036] Above: 1. Main housing; 2. Iron core; 3. Primary coil; 4. Secondary coil. DETAILED DESCRIPTION

[0037] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0038] Accordingly, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present invention without creative efforts shall fall within the scope of protection of the present invention.

[0039] It should be noted that like reference numerals and letters denote like items in the following figures, and thus, once an item is defined in one figure, it will not be necessary to further define and explain it in subsequent figures.

[0040] In the description of the present invention, it is to be understood that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the inventive product is customarily placed during use, or the orientation or positional relationship commonly understood by those skilled in the art. These are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present invention.

[0041] In addition, the terms "first", "second", "third", etc. are only used for descriptive distinction and should not be construed as indicating or implying relative importance.

[0042] In the description of the present invention, it should also be noted that unless otherwise clearly defined and limited, the terms "arranged", "installed", "connected", "coupled" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0043] Embodiment 1. An automotive ignition coil, such as Figures 1 to 3As shown, it includes a main housing 1, an iron core 2, a primary coil 3, a secondary coil 4, and a spark plug. A energy storage module is provided on the main housing 1, and the energy storage module is electrically connected in parallel with the primary coil 3. When the primary coil 3 is connected to a DC power supply, the energy storage module and the primary coil 3 store electric field energy and magnetic field energy synchronously respectively. There is a flip circuit electrically connected between the energy storage module and the primary coil 3. When the flip circuit responds to the disconnection of the DC power supply from the primary coil 3, it connects the energy storage module and the primary coil 3, providing a reverse voltage that is reversely transmitted to the primary coil 3, and the magnitude of the reverse voltage is equal to the self-inductance voltage generated by the primary coil 3. When the DC power supply supplies power to the primary coil 3, since the primary coil 3 and the energy storage module are connected in parallel, while the DC power supply supplies power to the primary coil 3, the energy storage module is synchronously powered and stored.

[0044] The energy storage module includes an energy storage capacitor and a voltage-dividing resistor connected in parallel with the energy storage capacitor. Both the energy storage capacitor and the voltage-dividing resistor are connected in parallel with the primary coil 3, and the energy storage module further includes a micro current relay and a relay switch. The relay switch includes a normally open switch, and the normally open switch is connected in series with the voltage-dividing resistor. The relay switch also includes a normally closed switch, and the normally closed switch is electrically connected to the output terminals of the energy storage capacitor and the primary coil 3. When the DC power supply is disconnected from the primary coil 3, the normally closed switch is closed to short-circuit the positive pole of the energy storage capacitor and the output terminal of the primary coil 3, providing the potential voltage at the output terminal of the primary coil 3.

[0045] The flip circuit includes four diodes, and the four diodes are electrically connected in sequence to form a bridge circuit. The common terminals of adjacent diodes facing or facing away from each other are electrically connected to both ends of the energy storage capacitor respectively.

[0046] In this embodiment, the energy storage power of the primary coil 3 is WL = 1 / 2 * L * I 2 , the energy storage power of the energy storage capacitor is WC = 1 / 2 * C * U2, and the capacitance value of the energy storage capacitor is C = U2 / (L * I 2 ), where WL and WC are the energy storage powers of the primary coil 3 and the energy storage capacitor respectively, L is the self-inductance coefficient of the primary coil 3, I is the magnitude of the DC current flowing through the primary coil 3, C is the capacitance value of the energy storage capacitor, and U is the magnitude of the voltage applied across the energy storage capacitor. Based on the application, in order to realize the self-inductance voltage compensated for the primary coil 3 to resist the decreasing trend of the current (voltage) when the DC power is cut off, it is planned to cancel it by the voltage released by the energy storage capacitor. Then, when it is necessary to adjust the balance point of the energy storage power between the primary coil 3 and the energy storage capacitor, that is, to achieve WL = WC in the direct connection case, therefore, the capacitance of the energy storage capacitor is C = U2 / (L * I 2), so that through the voltage provided by the DC power supply and the current flowing through the primary coil 3, combined with the self-inductance coefficient affected by the number of turns and material factors of the selected primary coil 3, a storage capacitor with an appropriate capacity can be selected to balance the self-induced voltage generated by the primary coil 3, so as to accelerate the magnetic decay of the primary coil 3 when the power is cut off, and ensure that the secondary coil 4 can generate a more efficient and larger mutual inductance voltage to drive the spark plug.

[0047] Embodiment 2. The ignition controller of an automotive ignition coil includes an automotive ignition coil, and

[0048] a Hall sensor is arranged on one side of the iron core 2 and outputs a pulse signal matching the magnetic field change rate in response to the increase or disappearance of the magnetic field of the primary coil 3 or the secondary coil 4;

[0049] a pulse detection circuit is connected to the Hall sensor and is used to receive the pulse signal to detect the period or frequency of the output pulse and display the magnetic decay rate of the coil;

[0050] a modulation circuit is a modulation circuit connected to the automotive ignition coil and is used to modulate the magnitude of the reverse voltage.

[0051] In this embodiment, the Hall sensor is arranged on the inner top surface of the main housing 1 and directly above the iron core 2. When a current flows through the primary coil 3 or the secondary coil 4, a corresponding magnetic field will be generated on the iron core 2 according to the principle of electromagnetic induction. When the DC power supply is disconnected, a magnetic decay phenomenon occurs. The Hall sensor detects the attenuation intensity and rate of the magnetic field during the magnetic decay process and then outputs a pulse signal. The pulse width of the pulse signal is proportional to the magnetic decay rate of the primary coil 3 or the secondary coil 4. When the output pulse signal is transmitted to the pulse detection circuit, by measuring the pulse width of the pulse signal, the speed of magnetic decay can be intuitively understood, and the matching situation between the capacity of the storage capacitor and the self-inductance coefficient of the primary coil 3 can be feedback through the waveform of the pulse, so as to facilitate the subsequent selection of a suitable storage capacitor. By detecting the period or frequency of the generated current through the pulse detection circuit, the ignition coil can be detected during production and maintenance, with good efficiency and accuracy. The further provided modulation circuit can adjust the stored charge in the energy storage module according to the differences in winding and material of the primary coil 3 during production, and then balance the energy storage capacitor and the primary coil 3, ensuring the efficiency of the magnetic decay of the primary coil 3. By adjusting the capacitance and the potential voltage at the end of the primary coil 3, the influence of the self-induced voltage on the magnetic field decay can be suppressed and offset, so as to achieve that the secondary coil 4 can quickly generate a higher high voltage to make the spark plug jump and break down and ignite the combustible mixture.

[0052] Such as Figure 4As shown, the modulation circuit includes a tunable capacitor connected in parallel with the energy storage capacitor. The minimum capacitance of the tunable capacitor is greater than or equal to the capacitance of the energy storage capacitor. In this embodiment, by connecting the tunable capacitor in parallel with the energy storage capacitor, after the energy storage capacitor and the tunable capacitor are connected in parallel, the total capacitance is the sum of the capacitances of the two capacitors. Subsequently, the purpose of canceling the self-inductive voltage that hinders the voltage change generated after the primary coil 3 is powered off by the energy storage module and maintaining balance is achieved, thus realizing rapid demagnetization of the primary coil 3 when powered off.

[0053] Embodiment 3 is different from Embodiment 2 in that: as Figure 5 shown, the modulation circuit includes a voltage dividing circuit composed of several fixed resistors. The voltage dividing circuit is connected in series with the energy storage capacitor to ground. The output end of the primary coil 3 is coupled to the potential point of the adjacent fixed resistor. An adjustable resistor is connected in series in the voltage dividing circuit. By means of voltage division, the potential can be adjusted at a lower cost, and the adjustment of the resistor is more stable.

[0054] In the above embodiment, referring to Figures 3 - 5 shown, the resistors R1 and R3 are fixed resistors with a value of 50 - 80 ohms to avoid short-circuiting the circuit during DC power supply and form a loop to charge the energy storage capacitor. The adjustable resistor is Rx, the normally open switch is K-1, the normally closed switch is K-2, and the switch K is the power switch for turning on and off the DC power supply.

[0055] The above are only the preferred embodiments of the present invention and are not used to limit the present invention. For those skilled in the art, the present invention can have various changes and modifications. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. An automotive ignition coil, comprising a main housing (1), an iron core (2), a primary coil (3), a secondary coil (4) and a spark plug, characterized in that: A energy storage module is provided on the main housing (1). When the primary coil (3) is connected to a DC power supply, the energy storage module stores electric field energy and magnetic field energy synchronously with the primary coil (3) respectively. It further includes a flip - flop circuit. When the DC power supply is disconnected from the primary coil (3), the flip - flop circuit connects the energy storage module and the primary coil (3), providing a reverse voltage that is fed back to the primary coil (3), and the magnitude of the reverse voltage is equal to the self - inductance voltage generated by the primary coil (3). The energy storage module includes an energy storage capacitor and a voltage - dividing resistor. The energy storage module further includes a micro - current relay and a relay switch. The relay switch includes a normally - open switch, and the normally - open switch is connected in series with the voltage - dividing resistor. The flip - flop circuit includes four diodes, and the four diodes are electrically connected in sequence to form a bridge circuit. The four diodes include a first diode, a second diode, a third diode, and a fourth diode. The anodes of the first diode and the second diode are mutually coupled, and the cathode of the first diode is connected to the DC power supply. The cathode of the second diode is grounded after being connected in series with the micro - current relay. The cathodes of the third diode and the fourth diode are coupled, the anode of the third diode is connected to the DC power supply, and the anode of the fourth diode is grounded after being connected in series with the micro - current relay. The negative electrode of the energy storage capacitor is connected between the anodes of the first diode and the second diode. It further includes a resistor R1. One end of the resistor R1 is connected to the positive electrode of the energy storage capacitor, and the other end of the resistor R1 is connected between the cathodes of the third diode and the fourth diode. The relay switch further includes a normally - closed switch, and the normally - closed switch is electrically connected between the positive electrode of the energy storage capacitor and the output end of the primary coil (3). When the DC power supply is disconnected from the primary coil (3), the normally - closed switch is closed to short - circuit the positive electrode of the energy storage capacitor and the output end of the primary coil (3). One end of the voltage - dividing resistor is coupled to the negative electrode of the energy storage capacitor, and the other end of the voltage - dividing resistor is coupled to one end of the normally - open switch of the relay switch. The other end of the normally - open switch of the relay switch is connected between the positive electrode of the energy storage capacitor and the normally - closed switch of the relay switch.

2. The automotive ignition coil according to claim 1, characterized in that: The energy storage power of the primary coil (3) is \(W = \frac{1}{2}LI^{2}\), the energy storage power of the energy storage capacitor is \(W=\frac{1}{2}CU^{2}\), and the capacitance value of the energy storage capacitor is \(C=\frac{U^{2}}{LI^{2}}\), where \(L\) is the self - inductance coefficient of the primary coil (3), \(I\) is the magnitude of the DC current flowing through the primary coil (3), and \(U\) is the magnitude of the voltage applied across the energy storage capacitor.

3. Ignition controller of an automotive ignition coil, characterized in that: It includes the automotive ignition coil according to any one of claims 1 or 2, and further includes: A Hall sensor is provided on one side of the iron core (2). When the magnetic field of the primary coil (3) or the secondary coil (4) increases or disappears, it outputs a pulse signal that matches the rate of change of the magnetic field. A pulse detection circuit is connected to the Hall sensor, used to receive the pulse signal to detect the period or frequency of the output pulse, and display the magnetic decay rate of the coil.

4. The ignition controller of the automotive ignition coil according to claim 3, characterized in that: It further includes a modulation circuit connected to the automotive ignition coil, and the modulation circuit is used to modulate the magnitude of the reverse voltage.

5. The ignition controller of the automotive ignition coil according to claim 4, characterized in that: The modulation circuit includes a variable capacitor, one end of the variable capacitor is connected to the positive electrode of the energy storage capacitor, the other end of the variable capacitor is connected to the positive electrode of the fourth diode, and the minimum capacitance of the variable capacitor is greater than or equal to the capacitance of the energy storage capacitor.

6. The ignition controller of the automotive ignition coil according to claim 4, characterized in that: The modulation circuit includes a variable resistor, one end of the variable resistor is connected to the positive electrode of the energy storage capacitor, and the other end of the variable resistor is connected to the output end of the primary coil.

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