Intelligent ignition drive module and its circuit

Abstract

The present invention provides an intelligent ignition drive module with stable performance and reliable functions, including a module signal input terminal and a module signal output terminal, including a comparator connected to the module signal input terminal, a peak filter connected to the output terminal of the comparator, and an input with positive and negative peak values ​​less than a preset time Ts is filtered by the peak filter; an IGBT connected to the peak filter; and the output terminal of the IGBT is connected to the module signal output terminal. Due to the adoption of the above technical solution, the present invention is an intelligent ignition drive module with stable performance and reliable functions.

Description

Technical Field

[0001] The invention relates to an intelligent ignition drive module. Background Art

[0002] In the automobile engine ignition system, the ignition coil is an actuator that provides ignition energy for igniting the air and fuel mixture in the engine cylinder. It is a special pulse booster based on the principle of electromagnetic induction. It switches the low voltage of 8-16V on and off at a set frequency to generate a 20-40KV voltage on the secondary side to generate electric sparks through the spark plug. Due to the precise properties of the ignition coil, ignition coils of different performances need to be matched with dedicated drive circuits to meet functional requirements. Summary of the invention

[0003] In order to overcome the deficiencies in the prior art, the present invention aims to provide an intelligent ignition drive module with stable performance and reliable functions.

[0004] To achieve the above objectives, the present invention provides an intelligent ignition module, including a module signal input terminal and a module signal output terminal, including a comparator connected to the module signal input terminal, a peak filter connected to the output terminal of the comparator, and inputs with positive and negative peak values ​​less than a preset time Ts are filtered by the peak filter; an IGBT connected to the peak filter; and the output terminal of the IGBT is connected to the module signal output terminal.

[0005] Preferably, the comparison signal input terminal of the comparator is a constant voltage comparison signal.

[0006] Preferably, the comparison signal input terminal of the comparator is an editable current input buffer.

[0007] Preferably, a maximum dwell time timing module is connected between the comparator and the peak filter.

[0008] Preferably, it comprises a dwell time input terminal, the dwell time input terminal is connected to the maximum dwell time timing module, and the maximum dwell time can be changed by setting the dwell time capacitor.

[0009] Preferably, the dwell time input terminal is a dwell time capacitor.

[0010] Preferably, a soft-off switch is provided between the maximum dwell time timing module and the IGBT, and when the maximum dwell time is exceeded, the soft-off switch is turned on and the IGBT is turned off.

[0011] According to another aspect of the present invention, an intelligent ignition drive circuit is provided, comprising the intelligent ignition drive module as described above and a transistor connected to the signal output end of the module; the base of the transistor is connected to the signal output end of the module, and the collector is connected to the ignition coil.

[0012] Preferably, the emitter of the triode is grounded through a sensing resistor, and the intelligent ignition drive module is provided with a sensing voltage input terminal, and the sensing voltage input terminal is connected to the emitter of the triode.

[0013] Preferably, the ignition coil comprises a primary coil and a secondary coil, one end of the primary coil is connected to the base of the transistor, and the other end is connected to the voltage input end.

[0014] Due to the adoption of the above technical solution, the present invention is an intelligent ignition drive module with stable performance and reliable functions. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Attached Figure 1 It is a circuit structure block diagram of the first embodiment of the intelligent ignition drive module;

[0016] Attached Figure 2 This is a typical application schematic diagram of the first embodiment of the intelligent ignition drive circuit;

[0017] Attached Figure 3 This is a schematic diagram of a first embodiment of an intelligent ignition drive module;

[0018] Attached Figure 4 A schematic diagram of the relationship between the dwell time and soft shutdown (SSD) of the first embodiment of the intelligent ignition drive circuit;

[0019] Attached Figure 5 A schematic diagram showing the relationship between the CSSD capacitor and the maximum dwell time in the first embodiment of the intelligent ignition drive circuit;

[0020] Attached Figure 6 A schematic diagram showing the relationship between the signal input current and the IRA current of the first embodiment of the intelligent ignition drive circuit;

[0021] Attached Figure 7 This is a circuit structure diagram of the second embodiment of the intelligent ignition drive module;

[0022] Attached Figure 8 This is a schematic diagram of the relationship between the dwell time and soft shutdown (SSD) of the second embodiment of the intelligent ignition drive circuit. DETAILED DESCRIPTION

[0023] The preferred embodiments of the present invention are described in detail below so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby making a clearer and more definite definition of the protection scope of the present invention.

[0024] See attached Figure 1 With attached Figure 2 As shown, attached Figure 1 This is the circuit structure diagram of the intelligent ignition drive module. Figure 2 The figure is a typical application diagram of an intelligent ignition drive circuit. An intelligent ignition drive circuit with stable performance and reliable functions includes an intelligent ignition drive module, a transistor connected to the module signal output terminal, the base of the transistor is connected to the module signal output terminal, and the collector is connected to the ignition coil. The emitter of the transistor is grounded through a sensing resistor, and the intelligent ignition drive module is provided with a sensing voltage input terminal, which is connected to the emitter of the transistor. The ignition coil includes a primary coil and a secondary coil, one end of the primary coil is connected to the base of the transistor, and the other end is connected to the voltage input terminal.

[0025] The intelligent ignition drive module (CS 5530) includes a module signal input terminal and a module signal output terminal, a comparator connected to the module signal input terminal, a peak filter connected to the output terminal of the comparator, and an IGBT connected to the peak filter. The input with positive and negative peak values ​​less than the preset time Ts is filtered by the peak filter. The output terminal of the IGBT is connected to the module signal output terminal, and the comparison signal input terminal of the comparator is a constant voltage comparison signal.

[0026] The CS 5530 is designed to directly drive the ignition IGBT, controlling the coil current and spark events. The coil current is controlled via the input pins, and when the single-ended / differential inputs are driven high, the outputs of the CS 5530 are enabled to turn on the IGBT and begin charging the coil. The CS 5530 will sink current (IIN) into the input pins based on the programmed current on the RA line. Features include: Supports differential or single-ended inputs for ground interference suppression; Signal line input buffer; Input peak filter; Operation from ignition or battery lines; Ground offset tolerance: differential input 2V / 3V, single-ended input - 1.5V to 1.5V; Programmable maximum dwell time; Programmable input pull-down current; Current output flag; Controls the current limit of the IGBT via the Vsense pin; Maximum dwell time after soft shutdown; SOP-8 packaging and RoHS compliant.

[0027] A maximum dwell time timer is included in the CS5530 which will shut down the IGBT if the input remains active for longer than the programmed time. The input spike filter suppresses single ended / differential input signals of less than 13µs duration. This time interval can be modified with an external capacitor. When the maximum dwell time is exceeded, the CS5530 will enter a soft shutdown (SSD) mode which releases the coil and suppresses the spark event by reducing the gate drive to the IGBT, thereby slowly reducing the collector current. During the charging process, the CS5530 will also limit the collector current to the IC (LIM) when the IGBT is charging. This is again achieved through a sense resistor in the emitter lead of the ignition IGBT, which sends a signal to the VSense pin of the CS5530, which relays the collector current level to the ECU via the current flag output.

[0028] See attached Figure 3 As shown, attached Figure 3 Schematic diagram of the smart ignition driver module. The CS 5530 is an advanced ignition IGBT control IC available in a Sop8 package or die sale. This full-featured smart ignition IGBT driver is particularly beneficial in "energized coil" applications where the size and system performance of the ignition driver are very important.

[0029] PIN NAME PIN # PIN pin function description GND 1 Reference Ground Input 2 Signal terminal input signal INL N / A Differential input ground signal INH N / A Differential positive input signal referred to INL CSSD 4 Adjustable maximum dwell time and soft-off current output (to external capacitor) IGF N / A Collector current flag diagnosis and feedback signal RA 5 Input reference current output (to external resistor) Output 6 IGBT Gate Drive Vsense 7 Meaning input for ilim function Vbat 8 Supply voltage

[0030] Table 1

[0031] Functional Description

[0032] 1. Input and spike filter for single-ended input signals

[0033] Attached Figure 4 This is a schematic diagram of the relationship between the dwell time and soft shutdown (SSD) of the first embodiment of the intelligent ignition drive circuit. When the input signal voltage reaches Vinh, the IGBT will be turned on to charge the coil. When the input voltage is lower than VINL, the coil current through the IGBT will be turned off. If the CS5530 operates in SSD mode, the input signal control is disabled. After the input reaches a valid low value after SSD, the sequence input control will be re-enabled. Positive and negative peaks in the input that are less than the T peak will be filtered out and the IGBT will not be turned on / off.

[0034] 2. Maximum dwell time and soft shutdown (SSD)

[0035] See attached Figure 5 and 6 , attached Figure 5 FIG. 1 is a schematic diagram showing the relationship between the CSSD capacitor and the maximum dwell time of the first embodiment of the intelligent ignition drive circuit. Figure 6Schematic diagram of the relationship between the signal input current and the IRA current of the first embodiment of the intelligent ignition drive circuit.

[0036] When the IGBT is turned on, a delay timer is started based on the value of the external CSSD capacitor. If no valid falling edge is received after TDMAX, the IGBT will be slowly turned off. The coil current will not exceed the typical 1.2A / ms slew rate. If a valid falling edge is received after the TDMAX time has elapsed, the edge is ignored and a soft turn-off is completed. The IGBT cannot subsequently be turned on until a valid rising edge is detected. If the value of the CSSD capacitor is less than 2.2nF, or the CSSD pin is shorted to ground, the maximum dwell time and SSD functions will be disabled.

[0037] Embodiment 2

[0038] Attached Figure 7 The circuit structure block diagram of the second embodiment of the intelligent ignition drive module; the comparison signal input terminal of the comparator is an editable current input buffer, and a maximum dwell time timing module is connected between the comparator and the peak filter. The intelligent ignition drive module also includes a dwell time input terminal, which is connected to the maximum dwell time timing module. The maximum dwell time can be changed by setting the dwell time capacitor. The dwell time input terminal is a dwell time capacitor. A soft-off switch is set between the maximum dwell time timing module and the dwell time input terminal. One end of the soft-off switch is connected to the IGBT. When the maximum dwell time is exceeded, the soft-off switch is turned on and the IGBT is turned off.

[0039] When the input signal voltage reaches VINH, the IGBT will start charging the coil. When the input voltage is lower than VINH, the coil current flowing through the IGBT will be turned off. If in SSD mode, the input signal control is disabled. When the input receives an invalid low level, the SSD sequential input control will be enabled again. Positive and negative peaks at the input that are less than the T peak are just filtered out and will not turn on or off the IGBT.

[0040] Attached Figure 8 This is a schematic diagram of the relationship between the dwell time and soft shutdown (SSD) of the second embodiment of the intelligent ignition drive circuit. When the IGBT is turned on, a delay timer will be started according to the value of the external CSSD capacitor. If no valid falling edge is received after TDMAX, the IGBT will be slowly turned off. The coil current will not exceed the typical rotation rate of 1.2A / ms. If a valid falling edge is received after the TDMAX time, the edge is ignored and the soft shutdown is completed. The IGBT cannot be turned on subsequently until a valid rising edge is detected. If the value of the CSSD capacitor is less than 2.2nF, or the CSSD pin is shorted to ground, the maximum dwell time and SSD functions will be disabled.

[0041] The above implementation modes are only for illustrating the technical concept and features of the present invention, and their purpose is to enable people familiar with this technology to understand the content of the present invention and implement it. They cannot be used to limit the protection scope of the present invention. All equivalent changes or modifications made according to the spirit of the present invention are included in the protection scope of the present invention.

Claims

1. An intelligent ignition drive circuit, characterized in that: It includes an intelligent ignition drive module, a transistor connected to the signal output end of the intelligent ignition drive module, the base of the transistor is connected to the module signal output end, the collector is connected to the ignition coil, and the emitter is grounded through a sensing resistor. The intelligent ignition drive module includes a module signal input end, a module signal output end, a comparator connected to the module signal input end, a peak filter connected to the output end of the comparator, and an IGBT connected to the peak filter. The input with positive and negative peak values ​​less than a preset time Ts is filtered by the peak filter, and the output end of the IGBT is connected to the module signal output end; wherein the intelligent ignition drive module is provided with a sensing voltage input end, the sensing voltage input end is connected to the emitter of the transistor to sink the program current based on the sensing resistor into the sensing voltage input end, when the input signal voltage reaches Vinh, the IGBT will turn on the charging coil, and when the input voltage is lower than VINL, the coil current through the IGBT will be closed.

2. The intelligent ignition drive circuit according to claim 1, characterized in that: During the charging process, the sensing resistor limits the collector current of the IGBT to the IC when charging. The IGBT sends a signal input to the intelligent ignition driver module, which relays the collector current level to the ECU through the current flag output.

3. The intelligent ignition drive circuit according to claim 1, characterized in that: The comparison signal input terminal of the comparator is a constant voltage comparison signal.

4. The intelligent ignition drive circuit according to claim 1, characterized in that: The comparison signal input terminal of the comparator is an editable current input buffer.

5. The intelligent ignition drive circuit according to claim 1, characterized in that: A maximum dwell time timing module is connected between the comparator and the peak filter.

6. The intelligent ignition drive circuit according to claim 5, characterized in that: It comprises a dwell time input terminal, which is connected to the maximum dwell time timing module. The maximum dwell time can be changed by setting the dwell time capacitor.

7. The intelligent ignition drive circuit according to claim 6, characterized in that: A soft-off switch is provided between the maximum dwell time timing module and the IGBT. When the maximum dwell time is exceeded, the soft-off switch is turned on, the IGBT is turned off and enters the soft-off mode, the input signal control is prohibited, the positive peak value and negative peak value components at the input end that are less than the T peak value are just filtered out, and the IGBT is not turned on or off. The coil is released and the spark event is suppressed by slowly reducing the collector current. After the input reaches a valid low value, the sequence input control is re-enabled.

8. The intelligent ignition drive circuit according to claim 7, characterized in that: The dwell time input terminal is a dwell time capacitor. When the IGBT is turned on, a delay timer is started according to the value of the dwell time capacitor: if no valid falling edge is received after TDMAX, the IGBT will be slowly turned off; if a valid falling edge is received after the TDMAX time, the edge is ignored and soft shutdown is completed. The IGBT cannot be turned on subsequently before a valid rising edge is detected.

9. The intelligent ignition drive circuit according to claim 8, characterized in that: Configured to disable maximum dwell time and soft shutdown when the dwell time capacitor value is less than 2.2nF or is tied to ground.

10. The intelligent ignition drive circuit according to claim 1, characterized in that: The ignition coil comprises a primary coil and a secondary coil, one end of the primary coil is connected to the base of the transistor, and the other end is connected to the voltage input end.

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