Ignition coil control device, ignition system, and engine

Abstract

The invention provides an ignition coil control device, an ignition system and an engine. The ignition coil control device comprises an input comparison circuit, an input delay circuit, a protection circuit and a driving circuit. The first ends of the input comparison circuit, the input time-delay circuit, the protection circuit and the driving circuit receive power supply voltage, the control end of the input comparison circuit receives a first electric signal, and the second end of the input comparison circuit, the first end of the input time-delay circuit and the second end of the protection circuit are coupled to a first node. The third end of the input comparison circuit, the second end of the input delay circuit and the first control end of the driving circuit are coupled to a second node, the third end of the protection circuit and the second control end of the driving circuit are coupled to a third node, and the second end of the driving circuit is coupled to the control end of an ignition control switch of an ignition coil. According to the ignition control circuit, the requirements of the ignition coil on the on-off threshold value, on-off delay and the like of the ignition control circuit can be met, the cost can be remarkably reduced, and the production efficiency can be remarkably improved.

Description

Technical Field

[0001] The present invention relates to the technical field of engine control, and in particular to an ignition coil control device, an ignition system and an engine. Background Art

[0002] See also Figure 1 , Figure 1 FIG. 1 is a block diagram of a structure of an ignition coil control circuit 1 implemented using a custom chip in the related art. Figure 1 As shown, in the related art, the ignition coil control circuit 1 receives the PWM signal of the ECU (Electronic Control Unit), and drives the control switch IGBT (for example, Insulate-Gate Bipolar Transistor) of the ignition coil 2 to be turned on and off according to the processing result of the PWM signal to charge and discharge the ignition coil 2 to realize the ignition function of the spark plug 3. After a lot of research, it is found that when controlling the ignition coil 2, the required parameters of the ignition coil control circuit 1 mainly include: on-off threshold, on-off delay, PWM signal Over duty (duty cycle is too large, the duration of the high level of the PWM signal exceeds the maximum charging time of the ignition coil 2) fault protection and SCB (Short Circuit to Battery, short circuit power supply) fault protection. Among them, the PWM signal Over duty and SCB fault protection protect the ignition coil 2 by turning off the control switch IGBT after a delay. Further research has found that the duration of the shutdown delay is closely related to the control of the ECU and the engine. Unreasonable delays will cause a decrease in engine torque and output power, affecting engine control performance and efficiency. In addition, the study also found that when the PWM signal is over duty and SCB fault protection is in effect, the control switch IGBT will be turned off too slowly, which will increase power consumption, and high temperature operation will easily cause the control switch IGBT to overheat and be damaged. Based on the above research, it can be seen that: Reasonable setting of the required parameters of the ignition coil control circuit 1 can not only effectively reduce power consumption, but also improve engine performance and efficiency. The driver chip GD of the ignition coil in the related technology IC Usually a custom chip is used, however, this type of driver chip GD IC The design scheme of adding the peripheral circuit 4 to realize the ignition coil control circuit 1 has the following defects:

[0003] On the one hand, the driver chip GD IC For customized chips, the demand parameters are already fixed and difficult to adjust. On the other hand, customized chips are not easy to platformize; in addition, customized chips also have the risks of high cost and insufficient supply.

[0004] It should be noted that the information disclosed in the background technology section of the invention is only intended to deepen the understanding of the general background technology of the invention, and should not be regarded as an admission or suggestion in any form that the information constitutes prior art already known to those skilled in the art. Summary of the invention

[0005] The purpose of the present invention is to provide an ignition coil control device, an ignition system and an engine to address one or more of the problems in the prior art of using a driver chip for an ignition coil control circuit, such as difficulty in platform-based management and production, high cost, and inability to meet diverse requirements of required parameters. The present invention can not only meet the requirements of the ignition coil for the on-off threshold, on-off delay and other requirements of the ignition control circuit, but also the ignition coil control device can be implemented by discrete devices, which can significantly reduce costs; further, it is easy to manage production on a platform, which can significantly improve production efficiency.

[0006] In order to achieve the above-mentioned object, the present invention is implemented through the following technical scheme: an ignition coil control device, comprising: an input comparison circuit, an input delay circuit, a protection circuit and a drive circuit; a first end of the input comparison circuit, a first end of the protection circuit and a first end of the drive circuit receive a power supply voltage, a control end of the input comparison circuit receives a first electrical signal, a second end of the input comparison circuit, a first end of the input delay circuit and a second end of the protection circuit are coupled to a first node and the input delay circuit receives the power supply voltage through the first node, a third end of the input comparison circuit, a second end of the input delay circuit and a first control end of the drive circuit are coupled to a second node, a third end of the protection circuit and a second control end of the drive circuit are coupled to a third node, and a second end of the drive circuit is coupled to a control end of an ignition control switch of an ignition coil;

[0007] The ignition coil control device is configured to, when the first electrical signal is greater than or equal to a first preset value, delay driving the ignition control switch to be in an on state; when the first electrical signal is less than or equal to a second preset value, delay driving the ignition control switch to be in an off state; and when the duration that the first electrical signal is greater than or equal to the first preset value reaches a preset duration, drive the ignition control switch to be in an off state.

[0008] Optionally, the input comparison circuit is configured to output a second electrical signal at the first node according to the power supply voltage and the first electrical signal, and when the first electrical signal is greater than or equal to the first preset value, the second electrical signal is a first voltage signal, and when the first electrical signal is less than or equal to the second preset value, the second electrical signal is a second voltage signal; the input delay circuit is configured to delay outputting a third electrical signal at the second node according to the power supply voltage and the second electrical signal, and when the second electrical signal is the first voltage signal, the third electrical signal is a third voltage signal, and when the second electrical signal is the second voltage signal, the The third electrical signal is a fourth voltage signal; the driving circuit is configured to drive the ignition control switch to an on state according to the power supply voltage when the third electrical signal is the third voltage signal; and to drive the ignition control switch to an off state according to the power supply voltage when the third electrical signal is the fourth voltage signal; the protection circuit is configured to output a fifth voltage signal at the third node according to the power supply voltage when the duration of the second electrical signal being the first voltage signal reaches the preset duration; the driving circuit is also configured to drive the ignition control switch to an off state if the fifth voltage signal is received.

[0009] Optionally, the input comparison circuit includes a first voltage divider subcircuit, a first transistor and a first RC subcircuit; a first end of the first voltage divider subcircuit receives the supply voltage, a second end of the first voltage divider subcircuit is coupled to the second node, a third end of the first voltage divider subcircuit is coupled to the control end of the first transistor, a first end of the first transistor is coupled to the first node, a first end of the first RC subcircuit receives the first electrical signal and is coupled to the second end of the first transistor, a fourth end of the first voltage divider subcircuit and a second end of the first RC subcircuit are grounded; the first electrical signal includes a PWM signal;

[0010] The first voltage divider subcircuit is configured to generate a control voltage for the first transistor based on the supply voltage and the voltage at the second node; the first transistor is configured to output a first voltage signal at the first node when the PWM signal is greater than or equal to the first preset value; and to output a second voltage signal at the first node when the PWM signal is less than or equal to the second preset value.

[0011] Optionally, the first voltage divider sub-circuit includes a first resistor, a second resistor and a third resistor, the first end of the first resistor is coupled to the supply voltage, the second end of the first resistor, the first end of the second resistor, the first end of the third resistor and the control end of the first transistor are connected in common, the second end of the second resistor is coupled to the second node, and the second end of the third resistor is grounded.

[0012] Optionally, the first RC sub-circuit includes a first capacitor and a fourth resistor, the first end of the first capacitor, the second end of the first transistor and the first end of the fourth resistor are coupled to receive the first electrical signal; the second end of the first capacitor and the second end of the fourth resistor are grounded.

[0013] Optionally, the input comparison circuit also includes a diode and a first Zener diode, the cathode of the diode is coupled to the control end of the first transistor, the anode of the diode is coupled to the anode of the first Zener diode, and the cathode of the first Zener diode and the first end of the first RC sub-circuit are coupled to the second end of the first transistor.

[0014] Optionally, the input delay circuit includes a second transistor and a second RC sub-circuit, a first end of the second RC sub-circuit is coupled to the first node, a second end of the second RC sub-circuit is coupled to the control end of the second transistor, a first end of the second transistor is coupled to the second node, and a third end of the second RC sub-circuit and a second end of the second transistor are grounded;

[0015] The second RC sub-circuit is configured to, when the second electrical signal at the first node is the first voltage signal, charge through the supply voltage so that the second transistor enters the saturation region, and output the third voltage signal at the second node; and to discharge when the second electrical signal at the first node is the second voltage signal so that the second transistor enters the cut-off region, and output the fourth voltage signal at the second node.

[0016] Optionally, the second RC sub-circuit includes a fifth resistor, a sixth resistor, a seventh resistor and a second capacitor, the first end of the fifth resistor is coupled to the first node, the second end of the fifth resistor, the first end of the sixth resistor and the first end of the second capacitor are coupled, the second end of the sixth resistor and the first end of the seventh resistor are coupled to the control end of the second transistor, and the second end of the second capacitor and the second end of the seventh resistor are grounded.

[0017] Optionally, the protection circuit includes a second voltage-dividing subcircuit, a time protection subcircuit and an output subcircuit, the first end of the second voltage-dividing subcircuit, the first end of the time protection subcircuit and the first end of the output subcircuit receive the supply voltage, the second end of the second voltage-dividing subcircuit is coupled to the first node, the third end of the second voltage-dividing subcircuit is coupled to the control end of the time protection subcircuit, the second end of the time protection subcircuit is coupled to the control end of the output subcircuit, the second end of the output subcircuit is coupled to the third node, and the third end of the time protection subcircuit and the third end of the output subcircuit are grounded;

[0018] The second voltage-dividing subcircuit is configured to, when the second electrical signal at the first node is a second voltage signal, control the time protection subcircuit to be in a charging state according to the power supply voltage to shut off the output subcircuit's control over the second control terminal of the drive circuit; and when the second electrical signal at the first node is a first voltage signal, control the time protection subcircuit to discharge according to the power supply voltage to drive the output subcircuit to output a fifth voltage signal at the third node, so that the drive circuit drives the ignition control switch to be in an off state.

[0019] Optionally, the second voltage-dividing sub-circuit includes an eighth resistor and a ninth resistor, the first end of the eighth resistor receives the supply voltage, the second end of the eighth resistor, the first end of the ninth resistor and the control end of the time protection sub-circuit are coupled, and the second end of the ninth resistor is coupled to the first node.

[0020] Optionally, the time protection sub-circuit includes a third transistor, a tenth resistor, an eleventh resistor, a twelfth resistor and a third capacitor, the first end of the third transistor receives the supply voltage, the control end of the third transistor is coupled to the third end of the second voltage divider sub-circuit, the second end of the third transistor is coupled to the first end of the tenth resistor, the second end of the tenth resistor, the first end of the eleventh resistor and the first end of the third capacitor are coupled, the second end of the eleventh resistor and the first end of the twelfth resistor are coupled to the control end of the output sub-circuit, and the second end of the third capacitor and the second end of the twelfth resistor are grounded.

[0021] Optionally, the output sub-circuit includes a thirteenth resistor and a fourth transistor, the first end of the thirteenth resistor receives the supply voltage, the second end of the thirteenth resistor and the first end of the fourth transistor are coupled to the third node, the control end of the fourth transistor is coupled to the second end of the time protection sub-circuit, and the second end of the fourth transistor is grounded.

[0022] Optionally, the protection circuit also includes an amplifier sub-circuit, a first end of the amplifier sub-circuit receives the power supply voltage, a control end of the amplifier sub-circuit is coupled to the second end of the output sub-circuit, a second end of the amplifier sub-circuit is coupled to the third node, and a third end of the amplifier sub-circuit is grounded.

[0023] Optionally, the amplification sub-circuit includes a fourteenth resistor, a fifth transistor, a fifteenth resistor, a sixth transistor and a sixteenth resistor, the first end of the fourteenth resistor and the first end of the sixth transistor receive the supply voltage, the second end of the fourteenth resistor, the first end of the fifth transistor and the first end of the fifteenth resistor are coupled, the control end of the fifth transistor is coupled to the second end of the output sub-circuit, the second end of the fifteenth resistor is coupled to the control end of the sixth transistor, the second end of the sixth transistor is connected in series with the sixteenth resistor and then coupled to the third node, and the second end of the fifth transistor is grounded.

[0024] Optionally, the driving circuit includes a third voltage divider sub-circuit and a push-pull sub-circuit, the first end of the third voltage divider sub-circuit and the first end of the push-pull sub-circuit receive the supply voltage, the second end of the third voltage divider sub-circuit is coupled to the first control end of the push-pull sub-circuit, the third end of the third voltage divider sub-circuit is coupled to the second node, the fourth end of the third voltage divider sub-circuit and the second control end of the push-pull sub-circuit are coupled to the third node, the second end of the push-pull sub-circuit is coupled to the control end of the ignition control switch, and the third end of the push-pull sub-circuit is grounded.

[0025] Optionally, the third voltage-dividing sub-circuit includes a seventeenth resistor, an eighteenth resistor and a nineteenth resistor, the first end of the seventeenth resistor receives the supply voltage, the second end of the seventeenth resistor and the first end of the eighteenth resistor are coupled to the first control end of the push-pull sub-circuit, the second end of the eighteenth resistor and the first end of the nineteenth resistor are coupled to the second node, and the second end of the nineteenth resistor is coupled to the third node.

[0026] Optionally, the push-pull sub-circuit includes a seventh transistor, a twentieth resistor and an eighth transistor, the first end of the seventh transistor receives the supply voltage, the control end of the seventh transistor is coupled to the second end of the third voltage divider sub-circuit, the second end of the seventh transistor is connected in series with the twentieth resistor and then coupled to the first end of the eighth transistor and the control end of the ignition control switch, the control end of the eighth transistor is coupled to the third node, and the second end of the eighth transistor is grounded.

[0027] Optionally, the ignition coil control device also includes a power supply circuit, which includes a twenty-first resistor, a fourth capacitor, a second voltage regulator tube and a fifth capacitor, the first end of the twenty-first resistor and the first end of the fourth capacitor are used to receive a power supply voltage, the second end of the twenty-first resistor, the cathode of the second voltage regulator tube and the first end of the fifth capacitor are coupled to a fourth node to output the power supply voltage, and the second end of the fourth capacitor, the anode of the second voltage regulator tube and the second end of the fifth capacitor are grounded.

[0028] In order to achieve the above object, the present invention further provides an ignition system, which includes an ignition coil and any one of the ignition coil control devices described above.

[0029] In order to achieve the above object, the present invention further provides an engine, which includes any one of the above-mentioned ignition coil control devices or the above-mentioned ignition systems.

[0030] Compared with the prior art, the ignition coil control device, ignition system and engine provided by the present invention have the following advantages:

[0031] The ignition coil control device provided by the present invention can delay driving the ignition control switch to be in the on state when the first electrical signal is greater than or equal to the first preset value, and delay driving the ignition control switch to be in the off state when the first electrical signal is less than or equal to the second preset value, thereby meeting the on-off threshold and on-off delay requirements of the ignition coil for the ignition control circuit; at the same time, the ignition coil control device provided by the present invention can also drive the ignition control switch to be in the off state when the duration of the first electrical signal being greater than or equal to the first preset value reaches a preset duration, thereby effectively ensuring that the ignition coil does not ignite during a fault, thereby achieving fault protection. With such a configuration, the ignition coil control device provided by the present invention is realized by reasonably setting device parameters, which can not only effectively reduce the power consumption of the ignition control switch, but also improve the performance and efficiency of the engine. Furthermore, the ignition coil control device provided by the present invention includes an input comparison circuit, an input delay circuit, a protection circuit and a drive circuit. Therefore, it is designed through discrete components and implemented using a PCBA (Printed Circuit Board Assembly) process, which is easy to manage and produce on a platform basis. It is possible to produce corresponding ignition coil control devices according to different demand parameters, which can significantly reduce costs and improve production efficiency.

[0032] Since the ignition system and the engine provided by the present invention belong to the same inventive concept as the ignition coil control device provided by the present invention, the ignition system and the engine provided by the present invention at least have all the advantages of the ignition coil control device provided by the present invention. For details of the beneficial effects of the ignition system and the engine provided by the present invention, please refer to the above description of the beneficial effects of the ignition coil control device provided by the present invention, which will not be repeated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 This is a block diagram of the structure of the ignition coil control circuit implemented using a custom chip in the related technology;

[0034] Figure 2 This is a structural block diagram of an ignition coil control device provided in Embodiment 1 of the present invention;

[0035] Figure 3 A circuit diagram of a specific example of an ignition coil control device provided in Embodiment 1 of the present invention;

[0036] Figure 4 A circuit diagram of a specific example of an ignition coil control device provided in Embodiment 2 of the present invention;

[0037] Figure 5 A circuit diagram of a specific example of an ignition coil control device provided in Embodiment 3 of the present invention;

[0038] The reference numerals are as follows:

[0039] Ignition coil control circuit-1, driver chip-GD IC , control switch-IGBT, ignition coil-2, Load, spark plug-3, peripheral circuit-4;

[0040] Supply voltage - V BATT , supply voltage -V IN , the first electrical signal-EST;

[0041] Input comparison circuit-100, first voltage divider sub-circuit-110, first resistor-R1, second resistor-R2, third resistor-R3, first transistor-U1, first RC sub-circuit-120, first capacitor-C1, fourth resistor-R4; diode-D, first voltage regulator-Z1;

[0042] Input delay circuit-200, second transistor-U2, second RC sub-circuit-210, fifth resistor-R5, sixth resistor-R6, seventh resistor-R7, second capacitor-C2;

[0043] Protection circuit-300, second voltage-dividing sub-circuit-310, eighth resistor-R8, ninth resistor-R9, time protection sub-circuit-320, third transistor-U3, tenth resistor-R10, eleventh resistor-R11, twelfth resistor-R12, third capacitor-C3, output sub-circuit-330, thirteenth resistor-R13, fourth transistor-U4, amplification sub-circuit-340, fourteenth resistor-R14, fifth transistor-U5, fifteenth resistor-R15, sixth transistor-U6, sixteenth resistor-R16;

[0044] Driving circuit 400, third voltage dividing sub-circuit 410, seventeenth resistor R17, eighteenth resistor R18, nineteenth resistor R19, push-pull sub-circuit 420, seventh transistor U7, twentieth resistor R20, eighth transistor U8;

[0045] Power supply circuit-500, twenty-first resistor-R21, fourth capacitor-C4, second voltage regulator tube-Z2, fifth capacitor-C5;

[0046] Ignition control switch-U9;

[0047] The first node is N1, the second node is N2, the third node is N3, and the fourth node is N4. DETAILED DESCRIPTION

[0048] The ignition coil control device, ignition system and engine proposed by the present invention are further described in detail below in conjunction with the accompanying drawings. According to the following description, the advantages and features of the present invention will be more clear. It should be noted that the drawings are in a very simplified form and are not in precise proportions, which are only used to conveniently and clearly assist in explaining the purpose of the embodiments of the present invention. In order to make the purpose, features and advantages of the present invention more obvious and easy to understand, please refer to the drawings. It should be noted that the structure, proportion, size, etc. illustrated in the drawings of this specification are only used to match the content disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the limiting conditions for the implementation of the present invention. Any modification of the structure, change of the proportional relationship or adjustment of the size, under the same or similar conditions as the effects and purposes that can be achieved by the present invention, should still fall within the scope of the technical content disclosed by the present invention. The specific design features of the present invention disclosed herein include, for example, specific dimensions, directions, positions and shapes, which will be determined in part by the specific environment to be applied and used. And, in the embodiments described below, sometimes the same figure mark is used in common between different drawings to represent the same part or part with the same function, and its repeated description is omitted. In this specification, similar reference numerals and letters are used to refer to similar items, and therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures. In addition, if the method described herein includes a series of steps, the order of these steps presented herein is not necessarily the only order in which these steps can be performed, and some of the steps described may be omitted and / or some other steps not described herein may be added to the method.

[0049] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements. The singular forms "a", "an" and "the" include plural objects, the term "or" is generally used in a sense including "and / or", the term "several" is generally used in a sense including "at least one", and the term "at least two" is generally used in a sense including "two or more". In addition, the terms "first", "second" and "third" are used for descriptive purposes only and are not to be understood as indicating or suggesting relative importance or implicitly indicating the number of the indicated technical features.

[0050] It should be understood that when an element is referred to as being "connected," "connected to," or "coupled to" another element, it can be directly connected to the other element, or there can be intervening elements. Conversely, when an element is referred to as being "directly connected" or "directly connected to" another element, there are no intervening elements.

[0051] The core idea of ​​the present invention is to provide an ignition coil control device, an ignition system and an engine. The present invention can not only meet the requirements of the ignition coil for the on-off threshold, on-off delay and the like of the ignition control circuit, but also the ignition coil control device can be implemented by discrete devices, which can significantly reduce costs; further, it is easy to manage production on a platform, which can significantly improve production efficiency.

[0052] It should be noted that the ignition coil control device and the ignition system provided by the present invention can be applied to the engine provided by the present invention, and the ignition coil control device, the ignition system and the engine provided by the present invention can be applied to vehicles. It should be understood that the terms "vehicle" or "vehicle" or other similar terms used herein include general motor vehicles, such as passenger vehicles including sports utility vehicles (SUVs), buses, trucks, and various commercial vehicles.

[0053] Embodiment 1

[0054] This embodiment provides an ignition coil control device. For example, see Figure 2 and Figure 3,in, Figure 2 A structural block diagram of an ignition coil control device provided in one embodiment of the present invention; Figure 3 A circuit diagram of a specific example of an ignition coil control device provided by one embodiment of the present invention. Figure 2 and Figure 3 It can be seen that the ignition coil control device provided by the present invention includes: an input comparison circuit 100, an input delay circuit 200, a protection circuit 300 and a drive circuit 400. Exemplarily, the first end of the input comparison circuit 100, the first end of the protection circuit 300 and the first end of the drive circuit 400 receive a supply voltage V IN The control end of the input comparison circuit 100 receives a first electrical signal (exemplarily, an ignition control signal, which may be a PWM signal) EST, the second end of the input comparison circuit 100, the first end of the input delay circuit 200, and the second end of the protection circuit 300 are coupled to a first node N1, and the input delay circuit 200 receives the supply voltage V through the first node N1. IN , the third terminal of the input comparison circuit 100, the second terminal of the input delay circuit 200 and the first control terminal of the drive circuit 400 are coupled to the second node N2, the third terminal of the protection circuit 300 and the second control terminal of the drive circuit 400 are coupled to the third node N3, and the second terminal of the drive circuit 400 is coupled to the control terminal of the ignition control switch U9 of the ignition coil Load. Further, the ignition coil control device is configured to delay driving the ignition control switch U9 to be in the on state when the first electrical signal EST is greater than or equal to the first preset value; delay driving the ignition control switch U9 to be in the off state when the first electrical signal EST is less than or equal to the second preset value; and drive the ignition control switch U9 to be in the off state when the duration of the first electrical signal EST being greater than or equal to the first preset value reaches a preset duration.

[0055] The ignition coil control device provided by the present invention can delay driving the ignition control switch U9 to be in the on state when the first electrical signal EST is greater than or equal to the first preset value, and delay driving the ignition control switch U9 to be in the off state when the first electrical signal EST is less than or equal to the second preset value, thereby meeting the on-off threshold and on-off delay requirements of the ignition coil Load for the ignition control circuit; at the same time, the ignition coil control device provided by the present invention can also drive the ignition control switch U9 to be in the off state when the duration of the first electrical signal EST being greater than or equal to the first preset value reaches a preset duration, thereby effectively ensuring that the ignition coil Load does not ignite during a fault, thereby achieving fault protection. With such a configuration, the ignition coil control device provided by the present invention is realized by reasonably setting device parameters, which can not only effectively reduce the power consumption of the ignition control switch, but also improve the performance and efficiency of the engine. Furthermore, the ignition coil control device provided by the present invention includes an input comparison circuit 100, an input delay circuit 200, a protection circuit 300 and a drive circuit 400. Therefore, through discrete device design and PCBA (Printed Circuit Board Assembly) process, it is easy to manage production on a platform, and corresponding ignition coil control devices can be produced according to different demand parameters, which can significantly reduce costs and improve production efficiency.

[0056] It should be understood that the present invention does not impose too many restrictions on the specific values ​​of the first preset value, the second preset value and the preset duration. However, those skilled in the art should be able to understand that the second preset value is less than the first preset value; preferably, the preset duration is less than the safe working duration of the ignition coil, and the preset duration is greater than the maximum duration of the normal operation of the ignition coil, so that the ignition coil can be effectively protected while ensuring the normal operation of the ignition coil. Furthermore, the present invention does not impose specific restrictions on the specific implementation method of the ignition control switch U9. For example, the ignition control switch U9 can be, but is not limited to, an insulated gate bipolar transistor (IGBT). In the following text, unless otherwise specified, the ignition control switch U9 is taken as an example of an IGBT.

[0057] Preferably, in some exemplary embodiments, the input comparison circuit 100 is configured to INand the first electrical signal EST outputs a second electrical signal at the first node N1, and when the first electrical signal EST is greater than or equal to the first preset value, the second electrical signal is a first voltage signal, and when the first electrical signal EST is less than or equal to the second preset value, the second electrical signal is a second voltage signal; the input delay circuit 200 is configured to output a second electrical signal at the first node N1 according to the supply voltage V IN and the second electrical signal at the second node N2 to delay outputting a third electrical signal, and when the second electrical signal is the first voltage signal, the third electrical signal is a third voltage signal, and when the second electrical signal is the second voltage signal, the third electrical signal is a fourth voltage signal; the driving circuit 400 is configured to, when the third electrical signal is the third voltage signal, according to the supply voltage V IN Drive the ignition control switch U9 to be in the on state; when the third electrical signal is the fourth voltage signal, according to the supply voltage V IN The protection circuit 300 is configured to, when the duration of the second electrical signal being the first voltage signal reaches the preset duration, according to the supply voltage V IN A fifth voltage signal is output at the third node N3; the driving circuit 400 is further configured to drive the ignition control switch U9 to be in an off state if the fifth voltage signal is received.

[0058] Therefore, in the ignition coil control device provided by the present invention, the input comparison circuit 100 can output a first voltage signal at the first node N1 when the first electrical signal EST is greater than or equal to the first preset value (i.e., the on-voltage), and output a second voltage signal at the first node N1 when the first electrical signal EST is less than or equal to the second preset value (i.e., the off-voltage). As a result, the stability and reliability of the ignition coil control device can be improved, thereby avoiding malfunction of the ignition control switch U9 caused by noise or ground offset, and laying a foundation for ensuring the normal and stable operation of the ignition coil. Furthermore, the input delay circuit 200 can delay outputting the third voltage signal at the second node N2 when the second electrical signal is the first voltage signal, and delay outputting the fourth voltage signal at the second node N2 when the second electrical signal is the second voltage signal, thereby controlling the on and off states of the ignition control switch U9 through the driving circuit 400, thereby realizing the on delay and off delay of the ignition control switch U9, which can not only improve the immunity of the ignition coil control device to electromagnetic interference, but also a reasonable off delay is conducive to improving the control performance and efficiency of the engine. Furthermore, the protection circuit 300 can output a fifth voltage signal at the third node N3 when the duration of the second electrical signal being the first voltage signal reaches the preset duration, and the drive circuit 400 drives the ignition control switch U9 to be in the off state when receiving the fifth voltage signal. Therefore, through the mutual coordination of the input comparison circuit 100, the protection circuit 300 and the drive circuit 400, when the first electrical signal EST has an Overduty or SCB fault, the maximum conduction time of the ignition control switch U9 can be limited, thereby effectively ensuring that the ignition coil Load does not ignite during the fault period, thereby improving the safety of the ignition system.

[0059] Preferably, in some of the exemplary embodiments, please continue to refer to Figure 2 and Figure 3 ,from Figure 2 and Figure 3 It can be seen that the input comparison circuit 100 includes a first voltage dividing sub-circuit 110, a first transistor U1 and a first RC sub-circuit 120; the first end of the first voltage dividing sub-circuit 110 receives the supply voltage V IN, the second end of the first voltage-dividing subcircuit 110 is coupled to the second node N2, the third end of the first voltage-dividing subcircuit 110 is coupled to the control end of the first transistor U1, the first end of the first transistor U1 is coupled to the first node N1, the first end of the first RC subcircuit 120 receives the first electrical signal EST and is coupled to the second end of the first transistor U1, the fourth end of the first voltage-dividing subcircuit 110 and the second end of the first RC subcircuit 120 are grounded; the first electrical signal EST includes a PWM signal. Correspondingly, the first voltage-dividing subcircuit 110 is configured to IN and the voltage at the second node N2 to generate a control voltage of the first transistor U1; the first transistor U1 is configured to output a first voltage signal at the first node N1 when the PWM signal is greater than or equal to the first preset value; and to output a second voltage signal at the first node N1 when the PWM signal is less than or equal to the second preset value.

[0060] Therefore, the input comparison circuit 100 of the ignition coil control device provided by the present invention includes a first voltage-dividing subcircuit 110, a first transistor U1 and a first RC subcircuit 120. The reference voltage can be obtained through the first voltage-dividing subcircuit 110, and the switching characteristics of the first transistor U1 are fully utilized. When the PWM signal is greater than or equal to the first preset value (i.e., the on-voltage), the first voltage signal is output at the first node N1, and when the PWM signal is less than or equal to the second preset value (i.e., the off-voltage), the second voltage signal is output at the first node N1, so that the malfunction of the ignition control switch U9 caused by noise or ground offset can be effectively avoided; further, the first RC subcircuit 120 can perform denoising and shaping on the PWM signal, so as to effectively improve the working stability of the ignition coil control device. Furthermore, the design mode of the input comparison circuit 100 including the first voltage-dividing subcircuit 110, the first transistor U1 and the first RC subcircuit 120 also has the advantages of clear logic, simple structure and easy implementation.

[0061] It should be particularly noted that the input comparison circuit 100 described herein includes the first voltage divider sub-circuit 110, the first transistor U1 and the first RC sub-circuit 120, which is only an exemplary description of a preferred embodiment, and not a limitation of the present invention. The present invention does not impose too many restrictions on the specific implementation of the input comparison circuit 100. In other embodiments, the input comparison circuit 100 may also be implemented in other ways except for the first voltage divider sub-circuit 110, the first transistor U1 and the first RC sub-circuit 120. For example, the input comparison circuit 100 may also be implemented in a manner of combining a reference voltage generating circuit with a comparison sub-circuit. Due to space limitations, it will not be elaborated here. Those skilled in the art can learn from the contents disclosed in this article to implement the present invention, and are not limited to the exemplary contents of the preferred embodiments presented in this article.

[0062] Furthermore, the present invention does not impose too many restrictions on the specific implementation of the first transistor U1. The first transistor U1 may be, but is not limited to, a switch device with three terminals such as a MOS tube and a triode. The control end of the first transistor U1 is the base. In particular, Figure 2 and Figure 3 The first transistor U1 shown is an NPN transistor, the first end is the collector, and the second end is the emitter. This is only an exemplary description, not a limitation. In order to avoid redundancy, the specific implementation methods of the second transistor U2, the third transistor U3, the fourth transistor U4, the fifth transistor U5, the sixth transistor U6, the seventh transistor U7, and the eighth transistor U8 are also not too limited in the following text. They all refer to switching devices with three terminals. For detailed content, please refer to the description of this paragraph for adaptive understanding. In order to avoid redundancy, the content with similar principles will not be described one by one in this article.

[0063] For example, from Figure 3 It can also be seen that the first voltage dividing sub-circuit 110 includes a first resistor R1, a second resistor R2 and a third resistor R3, and a first end of the first resistor R1 is coupled to the supply voltage V IN , the second end of the first resistor R1, the first end of the second resistor R2, the first end of the third resistor R3 and the control end of the first transistor U1 are connected in common, the second end of the second resistor R2 is coupled to the second node N2, and the second end of the third resistor R3 is grounded. In this way, the first voltage divider subcircuit 110 is implemented by using the first resistor R1, the second resistor R2 and the third resistor R3, which are inexpensive and easy to obtain, which can not only effectively reduce the cost; but also lay a good foundation for meeting the personalized needs of the required parameters by reasonably selecting the electrical parameters (such as resistance) of the first resistor R1, the second resistor R2 and the third resistor R3.

[0064] It should be noted that, as can be understood by those skilled in the art, the present invention does not impose too many restrictions on the specific values ​​of the electrical parameters (such as resistance) of the first resistor R1, the second resistor R2 and the third resistor R3. When implementing the present invention, they should be reasonably set according to the actual requirements of the required parameters. Similarly, the present invention does not impose too many restrictions on the specific values ​​of the fourth resistor R4, the fifth resistor R5, the sixth resistor R6, the seventh resistor R7, the eighth resistor R8, the ninth resistor R9, the tenth resistor R10, the eleventh resistor R11, the twelfth resistor R12, the thirteenth resistor R13, the fourteenth resistor R14, the fifteenth resistor R15, the sixteenth resistor R16, the seventeenth resistor R17, the eighteenth resistor R18, the nineteenth resistor R19, the twentieth resistor R20 and the twenty-first resistor R21 described below. In order to avoid redundancy, they will not be described one by one below.

[0065] For example, from Figure 3 It can also be seen that the first RC sub-circuit 120 includes a first capacitor C1 and a fourth resistor R4, wherein a first end of the first capacitor C1, a second end of the first transistor U1, and a first end of the fourth resistor R4 are coupled to receive the first electrical signal EST; a second end of the first capacitor C1 and a second end of the fourth resistor R4 are grounded. Thus, the first RC sub-circuit 120 is implemented by using the first capacitor C1 and the fourth resistor R4, which is not only simple in structure but also easy to implement.

[0066] Based on the above description, it can be understood that the present invention does not impose too many restrictions on the specific values ​​of the electrical parameters (such as capacitance) of the first capacitor C1, and when implementing the present invention, it should be reasonably set according to the actual requirements of the required parameters. Similarly, the present invention does not impose too many restrictions on the specific values ​​of the second capacitor C2, the third capacitor C3, the fourth capacitor C4, and the fifth capacitor C5 described below, and in order to avoid redundancy, they will not be described one by one below.

[0067] Preferably, in some of the exemplary embodiments, please continue to refer to Figure 3 ,from Figure 3 It can be seen that the input comparison circuit 100 further includes a diode D and a first voltage regulator tube Z1, the cathode of the diode D is coupled to the control terminal of the first transistor U1, the anode of the diode D is coupled to the anode of the first voltage regulator tube Z1, and the cathode of the first voltage regulator tube Z1 and the first end of the first RC sub-circuit 120 are coupled to the second end of the first transistor U1. Thus, by connecting the diode D and the first voltage regulator tube Z1 in reverse series, bidirectional overvoltage protection can be achieved, the first transistor U1 can be better protected from damage, and the stability and reliability of the ignition coil control device provided by the present invention can be further improved.

[0068] In addition, it can be understood that the above-mentioned connection method of the diode D and the first voltage regulator Z1 is only an exemplary description, and not a limitation of the present invention. For example, in some other embodiments, the diode D and the first voltage regulator Z1 can also be connected in the following manner: the anode of the first voltage regulator Z1 is coupled to the control end of the first transistor U1, the cathode of the first voltage regulator Z1 is coupled to the cathode of the diode D, and the anode of the diode D and the first end of the first RC sub-circuit 120 are coupled to the second end of the first transistor U1. It can also achieve bidirectional overvoltage protection, better protect the first transistor U1 from damage, and further improve the stability and reliability of the ignition coil control device provided by the present invention.

[0069] Preferably, in some of the exemplary embodiments, please continue to refer to Figure 2 and Figure 3 ,from Figure 2 and Figure 3 It can be seen that the input delay circuit 200 includes a second transistor U2 and a second RC sub-circuit 210, the first end of the second RC sub-circuit 210 is coupled to the first node N1, the second end of the second RC sub-circuit 210 is coupled to the control end of the second transistor U2, the first end of the second transistor U2 is coupled to the second node N2, the third end of the second RC sub-circuit 210 and the second end of the second transistor U2 are grounded. Correspondingly, the second RC sub-circuit 210 is configured to, when the second electrical signal at the first node N1 is a first voltage signal, pass the supply voltage V IN Charging causes the second transistor U2 to enter the saturation region and output the third voltage signal at the second node N2; when the second electrical signal at the first node N1 is the second voltage signal, discharging causes the second transistor U2 to enter the cut-off region and output the fourth voltage signal at the second node N2.

[0070] Further, from Figure 2 and Figure 3 It can also be seen that the input delay circuit 200 receives the supply voltage V IN The supply voltage V may be indirectly received through the second molecular circuit 310 of the protection circuit 300 IN Thus, the input delay circuit 200 can not only save discrete components and reduce costs, but also effectively reduce the circuit area by sharing the second molecular circuit 310 of the protection circuit 300. For more details about the second molecular circuit 310, please refer to the following description of the various components of the protection circuit 300, which will not be described in detail here.

[0071] It can be seen that the input delay circuit 200 of the ignition coil control device provided by the present invention includes a second transistor U2 and a second RC sub-circuit 210. When the second electrical signal at the first node N1 is a first voltage signal, the supply voltage V IN The second RC subcircuit 210 can be charged by the second voltage-dividing subcircuit 310 until the second transistor U2 enters the saturation region, and the charging time realizes the on-delay; when the second electrical signal at the first node N1 is the second voltage signal, the second RC subcircuit 210 discharges until the second transistor U2 enters the cut-off region, and the discharge time realizes the off-delay. Thus, based on the on / off state of the second transistor U2 being synchronized with the ignition control switch U9, the second RC subcircuit 210 is used to realize the delay control of the second transistor U2, thereby realizing the on / off delay control of the ignition control switch U9, which can not only improve the immunity of the ignition coil control device to electromagnetic interference, but also effectively improve the performance and efficiency of the engine through reasonable electrical parameters of the second RC subcircuit 210 (such as the delay time). Further, the design method of the input delay circuit 200 including the second transistor U2 and the second RC subcircuit 210 also has the advantages of clear logic, simple structure and easy implementation.

[0072] It should be particularly noted that the input delay circuit 200 described herein includes the second triode U2 and the second RC sub-circuit 210, which is only an exemplary description of a preferred embodiment, and is not a limitation of the present invention. The present invention does not impose too many restrictions on the specific implementation of the input delay circuit 200. In other embodiments, the input delay circuit 200 may also be implemented in other ways besides the second triode U2 and the second RC sub-circuit 210. For example, the input delay circuit 200 may also be implemented in ways including but not limited to a timer circuit, a CPLD / FPGA or an op amp circuit. Due to space limitations, no further description is given here. Those skilled in the art can implement the present invention by analogy based on the contents disclosed herein, and are not limited to the exemplary contents of the preferred embodiments presented herein.

[0073] For example, from Figure 3It can be seen that the second RC subcircuit 210 includes a fifth resistor R5, a sixth resistor R6, a seventh resistor R7 and a second capacitor C2, the first end of the fifth resistor R5 is coupled to the first node N1, the second end of the fifth resistor R5, the first end of the sixth resistor R6 and the first end of the second capacitor C2 are coupled, the second end of the sixth resistor R6 and the first end of the seventh resistor R7 are coupled to the control end of the second transistor U2, and the second end of the second capacitor C2 and the second end of the seventh resistor R7 are grounded. Therefore, the design method of implementing the second RC subcircuit 210 by using the fifth resistor R5, the sixth resistor R6, the seventh resistor R7 and the second capacitor C2 is simple in structure and easy to implement.

[0074] Preferably, in some of the exemplary embodiments, please continue to refer to Figure 2 and Figure 3 The protection circuit 300 includes a second voltage-dividing subcircuit 310, a time protection subcircuit 320 and an output subcircuit 330. The first end of the second voltage-dividing subcircuit 310, the first end of the time protection subcircuit 320 and the first end of the output subcircuit 330 receive the supply voltage V IN , the second end of the second voltage-dividing subcircuit 310 is coupled to the first node N1, the third end of the second voltage-dividing subcircuit 310 is coupled to the control end of the time protection subcircuit 320, the second end of the time protection subcircuit 320 is coupled to the control end of the output subcircuit 330, the second end of the output subcircuit 330 is coupled to the third node N3, the third end of the time protection subcircuit 320 and the third end of the output subcircuit 330 are grounded. Correspondingly, the second voltage-dividing subcircuit 310 is configured to, when the second electrical signal at the first node N1 is a second voltage signal, according to the supply voltage V IN The time protection subcircuit 320 is controlled to be in a charging state to shut down the control of the output subcircuit 330 on the second control terminal of the driving circuit 400; when the second electrical signal at the first node N1 is a first voltage signal, according to the supply voltage V IN The time protection sub-circuit 320 is controlled to discharge and drive the output sub-circuit 330 to output a fifth voltage signal at the third node N3, so that the drive circuit 400 drives the ignition control switch U9 to be in an off state.

[0075] It can be seen that the protection circuit 300 of the ignition coil control device provided by the present invention includes a second voltage-dividing subcircuit 310, a time protection subcircuit 320 and an output subcircuit 330. When the second electrical signal at the first node N1 is a second voltage signal, the second voltage-dividing subcircuit 310 can make the time protection subcircuit 320 in a charging state so that the output subcircuit 330 outputs a sixth voltage signal at the third node N3, thereby shutting off the control of the output subcircuit 330 on the second control terminal of the drive circuit 400, so that the drive circuit 400 is only controlled by the supply voltage V IN and the control of the input delay circuit 200; when the second electrical signal at the first node N1 is a first voltage signal, the time protection subcircuit 320 discharges so that the output subcircuit 330 outputs a fifth voltage signal at the third node N3, so that the drive circuit 400 drives the ignition control switch U9 to be in an off state, which can effectively ensure that the ignition coil Load does not ignite during the fault period, thereby achieving fault protection; at the same time, by selecting the electrical parameters of the time protection subcircuit 320 (such as the device parameters of the time protection subcircuit 320), different fault protection duration requirements can be met. In addition, the design method of the protection circuit 300 including the second voltage divider subcircuit 310, the time protection subcircuit 320 and the output subcircuit 330 also has the advantages of clear logic, simple structure and easy implementation.

[0076] It should be particularly noted that the protection circuit 300 described herein includes the second voltage-dividing subcircuit 310, the time protection subcircuit 320, and the output subcircuit 330, which is only an exemplary description of a preferred embodiment, and not a limitation of the present invention. The present invention does not impose too many restrictions on the specific implementation of the protection circuit 300. In other embodiments, the protection circuit 300 may also be implemented in other ways except the second voltage-dividing subcircuit 310, the time protection subcircuit 320, and the output subcircuit 330. For example, the protection circuit 300 may also be implemented in ways including but not limited to a timer circuit, a CPLD / FPGA, and an op amp circuit. Due to space limitations, it will not be elaborated here. Those skilled in the art can learn from the contents disclosed in this article to implement the present invention, and are not limited to the exemplary contents of the preferred embodiments presented in this article.

[0077] For example, from Figure 3 It can be seen that the second voltage dividing sub-circuit 310 includes an eighth resistor R8 and a ninth resistor R9, and a first end of the eighth resistor R8 receives the supply voltage V IN, the second end of the eighth resistor R8, the first end of the ninth resistor R9 and the control end of the time protection sub-circuit 320 are coupled, and the second end of the ninth resistor R9 is coupled to the first node N1. Therefore, the design method of using the eighth resistor R8 and the ninth resistor R9 to implement the second voltage dividing sub-circuit 310 has a simple structure and is easy to implement.

[0078] For example, from Figure 3 It can also be seen that the time protection sub-circuit 320 includes a third transistor U3, a tenth resistor R10, an eleventh resistor R11, a twelfth resistor R12 and a third capacitor C3, and the first end of the third transistor U3 receives the supply voltage V IN , the control end of the third transistor U3 is coupled to the third end of the second voltage-dividing sub-circuit 310, the second end of the third transistor U3 is coupled to the first end of the tenth resistor R10, the second end of the tenth resistor R10, the first end of the eleventh resistor R11 and the first end of the third capacitor C3 are coupled, the second end of the eleventh resistor R11 and the first end of the twelfth resistor R12 are coupled to the control end of the output sub-circuit 330, and the second end of the third capacitor C3 and the second end of the twelfth resistor R12 are grounded. Therefore, the design method of implementing the time protection sub-circuit 320 by using the third transistor U3, the tenth resistor R10, the eleventh resistor R11, the twelfth resistor R12 and the third capacitor C3 is simple in structure and easy to implement.

[0079] For example, from Figure 3 It can also be seen that the output sub-circuit 330 includes a thirteenth resistor R13 and a fourth transistor U4. The first end of the thirteenth resistor R13 receives the supply voltage V IN The second end of the thirteenth resistor R13 and the first end of the fourth transistor U4 are coupled to the third node N3, the control end of the fourth transistor U4 is coupled to the second end of the time protection sub-circuit 320, and the second end of the fourth transistor U4 is grounded. Therefore, the design method of using the thirteenth resistor R13 and the fourth transistor U4 to implement the output sub-circuit 330 is simple in structure and easy to implement.

[0080] Preferably, in some of the exemplary embodiments, please continue to refer to Figure 2 and Figure 3 ,from Figure 2 and Figure 3 It can be seen that the driving circuit 400 includes a third voltage dividing sub-circuit 410 and a push-pull sub-circuit 420. The first end of the third voltage dividing sub-circuit 410 and the first end of the push-pull sub-circuit 420 receive the supply voltage V IN, the second end of the third voltage-dividing sub-circuit 410 is coupled to the first control end of the push-pull sub-circuit 420, the third end of the third voltage-dividing sub-circuit 410 is coupled to the second node N2, the fourth end of the third voltage-dividing sub-circuit 410 and the second control end of the push-pull sub-circuit 420 are coupled to the third node N3, the second end of the push-pull sub-circuit 420 is coupled to the control end of the ignition control switch U9, and the third end of the push-pull sub-circuit 420 is grounded.

[0081] It can be seen that the driving circuit 400 of the ignition coil control device provided by the present invention includes a push-pull subcircuit 420, through which the first electrical signal EST processed by the input comparison circuit 100 and the input delay circuit 200 can be conditioned to drive the ignition control switch U9 to be in an on or off state, thereby improving energy conversion efficiency and reducing electromagnetic interference. Furthermore, the design method of the driving circuit 400 including the third voltage divider subcircuit 410 and the push-pull subcircuit 420 also has the advantages of clear logic, simple structure and easy implementation.

[0082] It should be particularly noted that the drive circuit 400 described herein includes the third voltage-dividing subcircuit 410 and the push-pull subcircuit 420, which is only an exemplary description of a preferred embodiment, and is not a limitation of the present invention. The present invention does not impose too many restrictions on the specific implementation of the drive circuit 400. In other embodiments, the drive circuit 400 may also be implemented in other ways except the third voltage-dividing subcircuit 410 and the push-pull subcircuit 420. For example, the drive circuit 400 may also be implemented in ways including but not limited to a totem pole drive circuit or a bootstrap drive circuit. Due to space limitations, it will not be elaborated here. Those skilled in the art can learn from the contents disclosed in this article to implement the present invention, and are not limited to the exemplary contents of the preferred embodiments presented in this article.

[0083] For example, from Figure 3 It can be seen that the third voltage dividing sub-circuit 410 includes a seventeenth resistor R17, an eighteenth resistor R18 and a nineteenth resistor R19, and a first end of the seventeenth resistor R17 receives the supply voltage V IN , the second end of the seventeenth resistor R17 and the first end of the eighteenth resistor R18 are coupled to the first control end of the push-pull sub-circuit 420, the second end of the eighteenth resistor R18 and the first end of the nineteenth resistor R19 are coupled to the second node N2, and the second end of the nineteenth resistor R19 is coupled to the third node N3. Therefore, the design method of using the seventeenth resistor R17, the eighteenth resistor R18 and the nineteenth resistor R19 to implement the third voltage dividing sub-circuit 410 has a simple structure and is easy to implement.

[0084] For example, from Figure 3 It can also be seen that the push-pull sub-circuit 420 includes a seventh transistor U7, a twentieth resistor R20 and an eighth transistor U8. The first end of the seventh transistor U7 receives the power supply voltage V IN , the control end of the seventh transistor U7 is coupled to the second end of the third voltage-dividing sub-circuit 410, the second end of the seventh transistor U7 is connected in series with the 20th resistor R20 and then coupled to the first end of the eighth transistor U8 and the control end of the ignition control switch U9, the control end of the eighth transistor U8 is coupled to the third node N3, and the second end of the eighth transistor U8 is grounded. Therefore, the design method of implementing the push-pull sub-circuit 420 by using the seventh transistor U7, the 20th resistor R20 and the eighth transistor U8 is simple in structure and easy to implement.

[0085] Embodiment 2

[0086] This embodiment provides another ignition coil control device, for example, see Figure 4 A circuit diagram of a specific example of the ignition coil control device provided in this embodiment. Figure 2 , Figure 3 and Figure 4 It is not difficult to see that the ignition coil control device provided in this embodiment is basically the same as the ignition coil control device provided in the first embodiment, except that the protection circuit 300 of the ignition coil control device provided in this embodiment further includes an amplifier subcircuit 340. In order to avoid redundancy, only the differences from the first embodiment are described below. For the parts not mentioned in this embodiment, please refer to the relevant description of the first embodiment for adaptive understanding.

[0087] from Figure 4 It can be seen that the first end of the amplifier subcircuit 340 of the protection circuit 300 of the ignition coil control device provided in this embodiment receives the supply voltage V IN , the control end of the amplifier subcircuit 340 is coupled to the second end of the output subcircuit 330, the second end of the amplifier subcircuit 340 is coupled to the third node N3, and the third end of the amplifier subcircuit 340 is grounded. Therefore, the ignition coil control device provided by the present invention can accelerate the turn-off of the ignition control switch U9 through the amplifier subcircuit 340, so that the turn-off time of the ignition control switch U9 can reach the us level, reduce the turn-off loss and thermal damage risk of the ignition control switch U9, and improve the safety of the circuit.

[0088] Preferably, in some of the exemplary embodiments, please continue to refer to Figure 4The amplifying sub-circuit 340 includes a fourteenth resistor R14, a fifth transistor U5, a fifteenth resistor R15, a sixth transistor U6 and a sixteenth resistor R16, and a first end of the fourteenth resistor R14 and a first end of the sixth transistor U6 receive the supply voltage V IN , the second end of the fourteenth resistor R14, the first end of the fifth transistor U5 and the first end of the fifteenth resistor R15 are coupled, the control end of the fifth transistor U5 is coupled to the second end of the output sub-circuit 330, the second end of the fifteenth resistor R15 is coupled to the control end of the sixth transistor U6, the second end of the sixth transistor U6 is connected in series with the sixteenth resistor R16 and then coupled to the third node N3, and the second end of the fifth transistor U5 is grounded. Therefore, the design method of using the fourteenth resistor R14, the fifth transistor U5, the fifteenth resistor R15, the sixth transistor U6 and the sixteenth resistor R16 to implement the amplification sub-circuit 340 has a simple structure and is easy to implement.

[0089] It should be noted that the amplifier sub-circuit 340 described herein includes the fourteenth resistor R14, the fifth transistor U5, the fifteenth resistor R15, the sixth transistor U6 and the sixteenth resistor R16, which is only an exemplary description of a preferred embodiment, and is not a limitation of the present invention. The present invention does not impose too many limitations on the specific implementation of the amplifier sub-circuit 340. For more detailed information on how to implement the amplifier sub-circuit 340, please refer to the relevant content about the amplifier circuit known to those skilled in the art. Due to space limitations, this article will not elaborate on this.

[0090] Embodiment 3

[0091] This embodiment provides another ignition coil control device, for example, see Figure 5 , Figure 5 A circuit diagram of a specific example of the ignition coil control device provided in this embodiment. Figure 2 , Figure 3 and Figure 5 It can be seen that the ignition coil control device provided in this embodiment is substantially the same as the ignition coil control device provided in the first embodiment, except that the ignition coil control device provided in this embodiment further includes a power supply circuit 500. In order to avoid redundancy, only the differences from the first embodiment are described below, and for the parts not mentioned in this embodiment, please refer to the relevant description of the first embodiment for adaptive understanding.

[0092] For example, from Figure 5 It can be seen that the power supply circuit 500 includes a twenty-first resistor R21, a fourth capacitor C4, a second voltage regulator Z2 and a fifth capacitor C5, and the first end of the twenty-first resistor R21 and the first end of the fourth capacitor C4 are used to receive the power supply voltage VBATT The second end of the twenty-first resistor R21, the cathode of the second voltage regulator tube Z2 and the first end of the fifth capacitor C5 are coupled to the fourth node N4 to output the supply voltage V IN , the second end of the fourth capacitor C4, the anode of the second voltage regulator Z2 and the second end of the fifth capacitor C5 are grounded. Therefore, the power supply circuit 500 of the ignition coil control device provided by the present invention adopts a combination design of a current limiting resistor, a capacitor and a voltage regulator tube, which can convert the battery voltage into the power supply voltage V required by the subsequent circuits (input comparison circuit 100, input delay circuit 200, protection circuit 300 and drive circuit 400). IN , resistors, capacitors and Zener devices are cheap, which can significantly reduce costs.

[0093] It should be noted that, as those skilled in the art can understand, the power supply circuit 500 described herein includes the twenty-first resistor R21, the fourth capacitor C4, the second voltage regulator Z2, and the fifth capacitor C5, which is only an exemplary description of a preferred embodiment, and is not a limitation of the present invention. The present invention does not impose too many limitations on the specific implementation of the power supply circuit 500. For more detailed information on how to implement the power supply circuit 500, please refer to the relevant content on the voltage conversion circuit and the voltage stabilization circuit known to those skilled in the art. Due to space limitations, this article will not elaborate on this.

[0094] First, for the details of the amplifier sub-circuit 340, please refer to the relevant description in the ignition coil control device provided in the above-mentioned embodiment 2 for adaptive understanding; for the details of the power supply circuit 500, please refer to the relevant description in the ignition coil control device provided in the above-mentioned embodiment 3 for adaptive understanding; in order to avoid redundancy, this embodiment will no longer elaborate on the amplifier sub-circuit 340 of the protection circuit 300 of the ignition coil control device and the power supply circuit 500 of the ignition coil control device.

[0095] Secondly, for more detailed information about the second transistor U2 and the second RC sub-circuit 210 of the input delay circuit 200 of the ignition coil control device provided in this embodiment, as well as the time protection sub-circuit 320 and the output sub-circuit 330 of the protection circuit 300, please refer to the relevant description of Example 1 for adaptive understanding.

[0096] In order to better understand the present invention, first, Figure 5 The working principle of the ignition coil control device provided by the present invention is exemplarily described as follows:

[0097] (1) The first electrical signal EST (PWM signal) is in a high level state: when the first electrical signal EST exceeds the first preset value V th-onWhen the first transistor U1 enters the cut-off region, the supply voltage V IN The second capacitor C2 is charged through the eighth resistor R8, the ninth resistor R9 and the fifth resistor R5. When the voltage of the second capacitor C2 reaches a certain value, the base-emitter of the second transistor U2 is forward biased, the second transistor U2 enters the saturation region, the collector voltage of the second transistor U2 is pulled to the ground, the base voltage of the eighth transistor U8 is also pulled to the ground through the nineteenth resistor R19, and the eighth transistor U8 enters the cut-off region. At the same time, the voltage division of the seventeenth resistor R17 and the eighteenth resistor R18 makes the emitter-base of the seventh transistor U7 forward biased, the seventh transistor U7 enters the saturation region, and the supply voltage V IN The gate of the ignition control switch U9 is powered through the twentieth resistor R20 to generate a gate control signal of the ignition control switch U9, and the ignition control switch U9 is turned on to charge the ignition coil Load.

[0098] (2) The first electrical signal EST (PWM signal) is in a low level state: when the signal voltage is lower than the second preset value V th-off When the first transistor U1 enters the saturation region, the collector voltage of the first transistor U1 is pulled down, and the second capacitor C2 is discharged through the fifth resistor R5, the sixth resistor R6 and the seventh resistor R7. Finally, the base voltage of the second transistor U2 is pulled to the ground by the seventh resistor R7, and the second transistor U2 enters the cut-off region. The supply voltage V IN The base-emitter of the eighth transistor U8 is forward biased through the seventeenth resistor R17, the eighteenth resistor R18 and the nineteenth resistor R19, the eighth transistor U8 enters the saturation region, the gate of the ignition control switch U9 is pulled down to the ground, the ignition control switch U9 is turned off, and the ignition coil Load is ignited.

[0099] (3) PWM signal over duty or SCB fault: When the first electrical signal EST is at a low level, the voltage division of the eighth resistor R8 and the ninth resistor R9 causes the emitter-base of the third transistor U3 to be forward biased, and the third transistor U3 enters the saturation region. The third capacitor C3 is charged through the tenth resistor R10, the fourth transistor U4 works in the saturation region, and the fifth transistor U5 and the sixth transistor U6 work in the cut-off region; when the first electrical signal EST is at a high level for a long time (for example, exceeding a preset time), the first transistor U1 is in the cut-off state, and the third transistor U3 is also in the cut-off state (it can be determined based on the electrical Parameters, realized by selecting the resistance values ​​of the eighth resistor R8 and the ninth resistor R9), the third capacitor C3 discharges through the eleventh resistor R11, the twelfth resistor R12 and the base-emitter of the fourth triode U4 (the preset time length can be understood as the time length of discharging until the fourth triode U4 enters the cut-off region), when the voltage of the third capacitor C3 is lower than a certain value, the base voltage of the fourth triode U4 becomes low, the fourth triode U4 enters the cut-off region, the collector voltage of the fourth triode U4 increases, the base-emitter of the fifth triode U5 is forward biased, the fifth triode U5 and the sixth triode U6 enter the saturation region in turn, and the supply voltage V IN The base-emitter of the eighth transistor U8 is forward biased through the sixteenth resistor R16, the eighth transistor U8 enters the saturation region, the gate of the ignition control switch U9 is pulled down to the ground, and the ignition control switch U9 is turned off. When the fault disappears, the first electrical signal EST is pulled to a low level again, the first transistor U1 and the third transistor U3 enter the saturation region, the third capacitor C3 is recharged, the fourth transistor U4 enters the saturation region, the fifth transistor U5 and the sixth transistor U6 are in the cut-off state, and the first electrical signal EST can re-control the on / off state of the ignition control switch U9.

[0100] Next, combine Figure 5 The working principle of realizing the on / off threshold, on / off delay threshold, and PWM signal overduty or SCB fault protection is described as follows:

[0101] (1) Turn-on / off threshold: The base voltage of the first transistor U1 is determined by the working state of the first resistor R1, the second resistor R2, the third resistor R3 and the second transistor U2. The first resistor R1, the second resistor R2 and the third resistor R3 mainly generate the base reference voltage. When the first electrical signal EST is at a high level, the second transistor U2 is in the saturation region, the collector of the second transistor U2 is pulled down to the ground, and the first resistor R1, the second resistor R2 and the third resistor R3 generate the base voltage V of the first transistor U1. ref-off , the voltage of the first electrical signal EST and the base voltage V ref-offFor comparison, when the base-emitter of the first transistor U1 can be forward biased, the first transistor U1 enters the saturation region from the cut-off region. At this time, the turn-off threshold V th-off =V ref-off -V BE When the first electrical signal EST is at a low level, the second transistor U2 is in the cut-off region, and the collector voltage of the second transistor U2 provides an additional power supply path for the base of the first transistor U1 through the second resistor R2. The base voltage V of the first transistor U1 is obtained by combining the first resistor R1 and the third resistor R3. ref-on , the voltage of the first electrical signal EST is ref-on By comparison, when the base-emitter of the first transistor U1 cannot be forward biased, the first transistor U1 enters the cut-off region from the saturation region, and the conduction threshold V th-on =V ref-on -V BE .

[0102] (2) On / off delay: The on / off state of the second transistor U2 is synchronized with the on / off state of the ignition control switch U9. The RC circuit is used to realize the delay control of the base voltage of the second transistor U2, which can generate the on / off delay of the ignition control switch U9. When the first transistor U1 enters the cut-off region, the power supply voltage V IN The second capacitor C2 is charged through the eighth resistor R8, the ninth resistor R9, and the fifth resistor R5. When the voltage of the second capacitor C2 reaches the voltage at which the second transistor U2 begins to enter the saturation region, the time it takes for the voltage of the second capacitor C2 to be charged to this value is the turn-on delay. When the first transistor U1 enters the saturation region, the second capacitor C2 is discharged through the fifth resistor R5, the sixth resistor R6, and the seventh resistor R7. When the voltage of the second capacitor C2 is lower than the voltage at which the second transistor U2 begins to enter the cut-off region, the time it takes for the second capacitor C2 to be discharged to this value is the turn-off delay.

[0103] (3) The protection circuit 300 can protect against possible overduty and SCB faults of the first electrical signal EST (such as a PWM signal). When a fault occurs, the third capacitor C3, the eleventh resistor R11, and the twelfth resistor R12 realize the maximum protection time control, ensuring that the ignition control switch U9 automatically turns off after a certain period of time after the fault occurs, and the ignition coil Load no longer ignites during the fault. Furthermore, when this fault occurs at high temperature, the current flowing through the ignition control switch U9 is very large. At the same time, the designed protection time is at the level of tens of ms, so the power consumption of the ignition control switch U9 is relatively high, resulting in a high junction temperature of the ignition control switch U9. If the off time of the ignition control switch U9 is too long, there is a risk of overheating and damage to the ignition control switch U9. The present invention accelerates the off time of the ignition control switch U9 through the amplification subcircuit 340 (multi-stage amplification circuit), which can make the off time of the ignition control switch U9 reach the us level, thereby reducing the risk of thermal damage to the ignition control switch U9, thereby effectively improving the safety of the circuit.

[0104] It can be seen that by reasonably selecting the electrical parameters of each discrete component in the ignition coil control device provided by the present invention (such as the resistance value of the resistor, the capacitance value of the capacitor, etc.), different start-up and shutdown thresholds, start-up and shutdown delays, and fault protection durations can be achieved.

[0105] Embodiment 4

[0106] Based on the same inventive concept, this embodiment provides an ignition system, which includes an ignition coil and an ignition coil control device as described in any embodiment of the present invention.

[0107] Since the ignition system provided by the present invention and the ignition coil control device provided by the present invention belong to the same inventive concept, the ignition system provided by the present invention at least has all the advantages of the ignition coil control device provided by the present invention. For details of the beneficial effects of the ignition system provided by the present invention, please refer to the above description of the beneficial effects of the ignition coil control device provided by the present invention, which will not be repeated here.

[0108] It should be noted that, as can be understood by those skilled in the art, the ignition system provided by the present invention does not impose too many restrictions on the specific type of the ignition coil. For example, the ignition coil can be an open magnetic circuit ignition coil or a closed magnetic circuit ignition coil. Further, the present invention does not impose too many restrictions on the ignition system. For example, the ignition system can also include an ECU to control the ignition mode of the ignition coil through the ignition coil control device. Further, the present invention does not impose any restrictions on the application of the ignition system. For example, the ignition system can be used for a two-cylinder engine, a four-cylinder engine, and a six-cylinder engine. For another example, when used for a four-cylinder engine, the ignition coil can be ignited in groups at the same time or independently. It can be understood that the above is only an exemplary description of the relevant content of the ignition system provided by the present invention. For more detailed content of the ignition system provided by the present invention, please refer to the relevant technology known to those skilled in the art. Due to space limitations, this article will not elaborate.

[0109] Embodiment 5

[0110] Based on the same inventive concept, this embodiment provides an engine, which includes the ignition coil control device described in any of the above embodiments or the ignition system described in the embodiments of this document.

[0111] It should be noted that, as can be understood by those skilled in the art, the present invention does not impose too many restrictions on the type of the engine. Exemplarily, the types of the engine include but are not limited to turbocharging (such as 1.8T, etc.), VTEC (variable valve timing and valve lift electronic control system), i-VTEC (intelligent variable valve timing and lift system), CVVT (continuously variable valve timing system), VVT (continuously variable valve timing engine), VVT-i (intelligent variable valve timing system). Dual VVT-i (dual intelligent variable valve timing engine) and D-CVVT (dual variable valve timing, variable intake system engine), etc. In addition, for more detailed information about the engine, please refer to the relevant technologies known to those skilled in the art. Due to space limitations, this article will not elaborate on it.

[0112] In summary, the ignition coil control device, ignition system and engine provided by the present invention also have the following beneficial effects:

[0113] The ignition coil control device provided by the present invention can delay driving the ignition control switch to be in the on state when the first electrical signal is greater than or equal to the first preset value, and delay driving the ignition control switch to be in the off state when the first electrical signal is less than or equal to the second preset value, thereby meeting the on-off threshold and on-off delay requirements of the ignition coil for the ignition control circuit; at the same time, the ignition coil control device provided by the present invention can also drive the ignition control switch to be in the off state when the duration of the first electrical signal being greater than or equal to the first preset value reaches a preset duration, thereby effectively ensuring that the ignition coil does not ignite during a fault, thereby achieving fault protection. With such a configuration, the ignition coil control device provided by the present invention is realized by reasonably setting device parameters, which can not only effectively reduce the power consumption of the ignition control switch, but also improve the performance and efficiency of the engine. Furthermore, the ignition coil control device provided by the present invention includes an input comparison circuit, an input delay circuit, a protection circuit and a drive circuit. Therefore, it is designed through discrete components and implemented using a PCBA (Printed Circuit Board Assembly) process, which is easy to manage and produce on a platform basis. It is possible to produce corresponding ignition coil control devices according to different demand parameters, which can significantly reduce costs and improve production efficiency.

[0114] Since the ignition system and the engine provided by the present invention belong to the same inventive concept as the ignition coil control device provided by the present invention, the ignition system and the engine provided by the present invention at least have all the advantages of the ignition coil control device provided by the present invention. For details of the beneficial effects of the ignition system and the engine provided by the present invention, please refer to the above description of the beneficial effects of the ignition coil control device provided by the present invention, which will not be repeated here.

[0115] It should be noted that the devices and methods disclosed in the embodiments of this article can also be implemented in other ways. The device implementation described above is only schematic. For example, the flowcharts and block diagrams in the accompanying drawings show the possible architecture, functions and operations of the devices, methods and computer program products according to multiple embodiments of this article. In this regard, each box in the flowchart or block diagram can represent a part of a module, program or code, and the module, program segment or part of the code contains one or more executable instructions for implementing the specified logical function, and the module, program segment or part of the code contains one or more executable instructions for implementing the specified logical function. It should also be noted that in some alternative implementations, the functions marked in the box can also occur in a different order from the order marked in the accompanying drawings. For example, two consecutive boxes can actually be executed substantially in parallel, and they can sometimes be executed in the opposite order, depending on the functions involved. It should also be noted that each box in the block diagram and / or flowchart, and the combination of boxes in the block diagram and / or flowchart can be implemented by a dedicated hardware-based system for performing a specified function or action, or can be implemented by a combination of dedicated hardware and computer instructions.

[0116] In addition, the functional modules in the various embodiments of this document may be integrated together to form an independent part, or each module may exist independently, or two or more modules may be integrated to form an independent part.

[0117] The above description is only a description of the preferred embodiments of the ignition coil control device, ignition system and engine provided by the present invention, and is not intended to limit the scope of the present invention. Any changes and modifications made by ordinary technicians in the field of the present invention based on the above disclosure are within the scope of protection of the present invention. Obviously, technicians in this field can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations fall within the scope of the present invention and its equivalent technology, the present invention is also intended to include these modifications and variations.

Claims

1. An ignition coil control device, characterized in that: include: An input comparison circuit, an input delay circuit, a protection circuit and a driving circuit; a first end of the input comparison circuit, a first end of the protection circuit and a first end of the driving circuit receive a power supply voltage, a control end of the input comparison circuit receives a first electrical signal, a second end of the input comparison circuit, a first end of the input delay circuit and a second end of the protection circuit are coupled to a first node and the input delay circuit receives the power supply voltage through the first node, a third end of the input comparison circuit, a second end of the input delay circuit and a first control end of the driving circuit are coupled to a second node, a third end of the protection circuit and a second control end of the driving circuit are coupled to a third node, and a second end of the driving circuit is coupled to a control end of an ignition control switch of an ignition coil; The ignition coil control device is configured to, when the first electrical signal is greater than or equal to a first preset value, delay driving the ignition control switch to be in an on state; when the first electrical signal is less than or equal to a second preset value, delay driving the ignition control switch to be in an off state; and when the duration that the first electrical signal is greater than or equal to the first preset value reaches a preset duration, drive the ignition control switch to be in an off state.

2. The ignition coil control device according to claim 1, characterized in that: The input comparison circuit is configured to output a second electrical signal at the first node according to the power supply voltage and the first electrical signal, and when the first electrical signal is greater than or equal to the first preset value, the second electrical signal is a first voltage signal, and when the first electrical signal is less than or equal to the second preset value, the second electrical signal is a second voltage signal; the input delay circuit is configured to delay outputting a third electrical signal at the second node according to the power supply voltage and the second electrical signal, and when the second electrical signal is the first voltage signal, the third electrical signal is a third voltage signal, and when the second electrical signal is the second voltage signal, the third electrical signal is a fourth voltage signal; the drive circuit is configured to drive the ignition control switch to an on state according to the power supply voltage when the third electrical signal is the third voltage signal; and to drive the ignition control switch to an off state according to the power supply voltage when the third electrical signal is the fourth voltage signal; The protection circuit is configured to output a fifth voltage signal at the third node according to the supply voltage when the duration of the second electrical signal being the first voltage signal reaches the preset duration; the drive circuit is also configured to drive the ignition control switch to an off state if the fifth voltage signal is received.

3. The ignition coil control device according to claim 1, characterized in that: The input comparison circuit includes a first voltage divider subcircuit, a first transistor and a first RC subcircuit; a first end of the first voltage divider subcircuit receives the power supply voltage, a second end of the first voltage divider subcircuit is coupled to the second node, a third end of the first voltage divider subcircuit is coupled to the control end of the first transistor, a first end of the first transistor is coupled to the first node, a first end of the first RC subcircuit receives the first electrical signal and is coupled to the second end of the first transistor, a fourth end of the first voltage divider subcircuit and a second end of the first RC subcircuit are grounded; the first electrical signal includes a PWM signal; The first voltage divider subcircuit is configured to generate a control voltage of the first transistor according to the supply voltage and the voltage at the second node; the first transistor is configured to output a first voltage signal at the first node when the PWM signal is greater than or equal to the first preset value; When the PWM signal is less than or equal to the second preset value, a second voltage signal is output at the first node.

4. The ignition coil control device according to claim 3, characterized in that: The first voltage divider subcircuit includes a first resistor, a second resistor and a third resistor, the first end of the first resistor is coupled to the supply voltage, the second end of the first resistor, the first end of the second resistor, the first end of the third resistor and the control end of the first transistor are connected in common, the second end of the second resistor is coupled to the second node, and the second end of the third resistor is grounded.

5. The ignition coil control device according to claim 3, characterized in that: The first RC sub-circuit includes a first capacitor and a fourth resistor, wherein the first end of the first capacitor, the second end of the first transistor and the first end of the fourth resistor are coupled to receive the first electrical signal; the second end of the first capacitor and the second end of the fourth resistor are grounded.

6. The ignition coil control device according to claim 3, characterized in that: The input comparison circuit also includes a diode and a first Zener diode, the cathode of the diode is coupled to the control end of the first transistor, the anode of the diode is coupled to the anode of the first Zener diode, and the cathode of the first Zener diode and the first end of the first RC sub-circuit are coupled to the second end of the first transistor.

7. The ignition coil control device according to claim 1, characterized in that: The input delay circuit includes a second transistor and a second RC sub-circuit, wherein a first end of the second RC sub-circuit is coupled to the first node, a second end of the second RC sub-circuit is coupled to the control end of the second transistor, a first end of the second transistor is coupled to the second node, and a third end of the second RC sub-circuit and a second end of the second transistor are grounded; The second RC sub-circuit is configured to, when the second electrical signal at the first node is the first voltage signal, charge through the supply voltage so that the second transistor enters the saturation region, and output the third voltage signal at the second node; and to discharge when the second electrical signal at the first node is the second voltage signal so that the second transistor enters the cut-off region, and output the fourth voltage signal at the second node.

8. The ignition coil control device according to claim 7, characterized in that: The second RC sub-circuit includes a fifth resistor, a sixth resistor, a seventh resistor and a second capacitor, the first end of the fifth resistor is coupled to the first node, the second end of the fifth resistor, the first end of the sixth resistor and the first end of the second capacitor are coupled, the second end of the sixth resistor and the first end of the seventh resistor are coupled to the control end of the second transistor, and the second end of the second capacitor and the second end of the seventh resistor are grounded.

9. The ignition coil control device according to claim 1, characterized in that: The protection circuit comprises a second voltage-dividing subcircuit, a time protection subcircuit and an output subcircuit, wherein a first end of the second voltage-dividing subcircuit, a first end of the time protection subcircuit and a first end of the output subcircuit receive the supply voltage, a second end of the second voltage-dividing subcircuit is coupled to the first node, a third end of the second voltage-dividing subcircuit is coupled to a control end of the time protection subcircuit, a second end of the time protection subcircuit is coupled to a control end of the output subcircuit, a second end of the output subcircuit is coupled to the third node, and a third end of the time protection subcircuit and a third end of the output subcircuit are grounded; The second voltage-dividing subcircuit is configured to, when the second electrical signal at the first node is a second voltage signal, control the time protection subcircuit to be in a charging state according to the power supply voltage to shut off the output subcircuit's control over the second control terminal of the drive circuit; and when the second electrical signal at the first node is a first voltage signal, control the time protection subcircuit to discharge according to the power supply voltage to drive the output subcircuit to output a fifth voltage signal at the third node, so that the drive circuit drives the ignition control switch to be in an off state.

10. The ignition coil control device according to claim 9, characterized in that: The second voltage-dividing sub-circuit includes an eighth resistor and a ninth resistor, the first end of the eighth resistor receives the supply voltage, the second end of the eighth resistor, the first end of the ninth resistor and the control end of the time protection sub-circuit are coupled, and the second end of the ninth resistor is coupled to the first node.

11. The ignition coil control device according to claim 9, characterized in that: The time protection sub-circuit includes a third transistor, a tenth resistor, an eleventh resistor, a twelfth resistor and a third capacitor, the first end of the third transistor receives the supply voltage, the control end of the third transistor is coupled to the third end of the second voltage divider sub-circuit, the second end of the third transistor is coupled to the first end of the tenth resistor, the second end of the tenth resistor, the first end of the eleventh resistor and the first end of the third capacitor are coupled, the second end of the eleventh resistor and the first end of the twelfth resistor are coupled to the control end of the output sub-circuit, and the second end of the third capacitor and the second end of the twelfth resistor are grounded.

12. The ignition coil control device according to claim 9, characterized in that: The output sub-circuit includes a thirteenth resistor and a fourth transistor, the first end of the thirteenth resistor receives the supply voltage, the second end of the thirteenth resistor and the first end of the fourth transistor are coupled to the third node, the control end of the fourth transistor is coupled to the second end of the time protection sub-circuit, and the second end of the fourth transistor is grounded.

13. The ignition coil control device according to claim 9, characterized in that: The protection circuit also includes an amplifier subcircuit, a first end of the amplifier subcircuit receives the power supply voltage, a control end of the amplifier subcircuit is coupled to the second end of the output subcircuit, a second end of the amplifier subcircuit is coupled to the third node, and a third end of the amplifier subcircuit is grounded.

14. The ignition coil control device according to claim 13, characterized in that: The amplification sub-circuit includes a fourteenth resistor, a fifth transistor, a fifteenth resistor, a sixth transistor and a sixteenth resistor, the first end of the fourteenth resistor and the first end of the sixth transistor receive the supply voltage, the second end of the fourteenth resistor, the first end of the fifth transistor and the first end of the fifteenth resistor are coupled, the control end of the fifth transistor is coupled to the second end of the output sub-circuit, the second end of the fifteenth resistor is coupled to the control end of the sixth transistor, the second end of the sixth transistor is connected in series with the sixteenth resistor and then coupled to the third node, and the second end of the fifth transistor is grounded.

15. The ignition coil control device according to claim 1, characterized in that: The driving circuit includes a third voltage divider sub-circuit and a push-pull sub-circuit, the first end of the third voltage divider sub-circuit and the first end of the push-pull sub-circuit receive the supply voltage, the second end of the third voltage divider sub-circuit is coupled to the first control end of the push-pull sub-circuit, the third end of the third voltage divider sub-circuit is coupled to the second node, the fourth end of the third voltage divider sub-circuit and the second control end of the push-pull sub-circuit are coupled to the third node, the second end of the push-pull sub-circuit is coupled to the control end of the ignition control switch, and the third end of the push-pull sub-circuit is grounded.

16. The ignition coil control device according to claim 15, characterized in that: The third voltage-dividing sub-circuit includes a seventeenth resistor, an eighteenth resistor and a nineteenth resistor, the first end of the seventeenth resistor receives the supply voltage, the second end of the seventeenth resistor and the first end of the eighteenth resistor are coupled to the first control end of the push-pull sub-circuit, the second end of the eighteenth resistor and the first end of the nineteenth resistor are coupled to the second node, and the second end of the nineteenth resistor is coupled to the third node.

17. The ignition coil control device according to claim 15, characterized in that: The push-pull sub-circuit includes a seventh transistor, a twentieth resistor and an eighth transistor, the first end of the seventh transistor receives the power supply voltage, the control end of the seventh transistor is coupled to the second end of the third voltage divider sub-circuit, the second end of the seventh transistor is connected in series with the twentieth resistor and coupled to the first end of the eighth transistor and the control end of the ignition control switch, the control end of the eighth transistor is coupled to the third node, and the second end of the eighth transistor is grounded.

18. The ignition coil control device according to claim 1, characterized in that: The ignition coil control device also includes a power supply circuit, which includes a twenty-first resistor, a fourth capacitor, a second voltage regulator tube and a fifth capacitor. The first end of the twenty-first resistor and the first end of the fourth capacitor are used to receive a power supply voltage. The second end of the twenty-first resistor, the cathode of the second voltage regulator tube and the first end of the fifth capacitor are coupled to a fourth node to output the power supply voltage. The second end of the fourth capacitor, the anode of the second voltage regulator tube and the second end of the fifth capacitor are grounded.

19. An ignition system, characterized in that: The invention comprises an ignition coil and an ignition coil control device as claimed in any one of claims 1 to 18.

20. An engine, characterized in that: The ignition coil control device comprises the ignition coil control device according to any one of claims 1 to 18 or the ignition system according to claim 19.

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