JP3762231B2 - Ignition device for internal combustion engine - Google Patents

Ignition device for internal combustion engine Download PDF

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Publication number
JP3762231B2
JP3762231B2 JP2001032272A JP2001032272A JP3762231B2 JP 3762231 B2 JP3762231 B2 JP 3762231B2 JP 2001032272 A JP2001032272 A JP 2001032272A JP 2001032272 A JP2001032272 A JP 2001032272A JP 3762231 B2 JP3762231 B2 JP 3762231B2
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Japan
Prior art keywords
primary current
circuit
igbt
gate
voltage
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JP2002235643A (en
Inventor
太加志 伊藤
亮 佐藤
良一 小林
克明 深津
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株式会社日立カーエンジニアリング
株式会社日立製作所
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Description

[0001]
[Industrial application fields]
The present invention relates to an ignition device for an internal combustion engine.
[0002]
[Prior art]
An ignition device for an internal combustion engine such as an automobile energizes a primary current flowing in an ignition coil by using a power switching element (power transistor) that operates according to an ignition control signal sent from an engine control unit (hereinafter referred to as ECU). / Shut off.
[0003]
In this type of ignition device, in order to prevent damage and destruction of the power transistor and the ignition coil, for example, as disclosed in JP-A-8-28415, a primary current flowing through the ignition coil is detected to 1 When the energized state such as the primary current limiting circuit for limiting the secondary current from flowing beyond the predetermined value or the ignition signal sent from the ECU continues for a predetermined time or longer, the power transistor is turned off and the primary current is energized. There has been proposed one having a continuous energization prevention circuit that forcibly cuts off the current.
[0004]
[Problems to be solved by the invention]
Some power switching elements of the ignition device are provided with a Zener diode for clamping the collector voltage for the purpose of withstand voltage protection so that the collector voltage generated when the primary current of the ignition coil is interrupted does not exceed the element withstand voltage. . This Zener diode is connected between the base and the collector when the power switching element is a bipolar transistor, and is connected between the gate and the collector in the case of an IGBT.
[0005]
In recent years, an ignition device using an IGBT as a power switching element has been proposed. However, as a result of analysis and investigation when a Zener diode for collector voltage clamping is used, the following has been found.
[0006]
(1) The clamping operation described above is based on the Zener current that flows when the collector voltage is equal to or higher than the Zener diode by providing a self-biasing resistor (herein, this resistor may be referred to as a gate resistor element) at the gate of the IGBT. The self-bias voltage of the IGBT is generated in the resistance element, and thereby the IGBT is re-energized to clamp the collector potential. Therefore, it is necessary to set the resistance value of the gate resistance element in consideration of the current capacity of the Zener diode and the specifications of the Zener operating resistance.
[0007]
When the gate resistance element is small, a large Zener current flows. As a result, the Zener voltage rises above the set value due to the Zener operating resistance, and dv / dt, which is the rate of increase, increases. Therefore, the growth of the depletion layer under the Zener oxide is not in time, and the device breakdown voltage cannot be secured sufficiently. there is a possibility.
[0008]
(2) On the other hand, the primary current limiting circuit monitors the voltage drop of the primary current detection resistor provided on the emitter side of the IGBT and adjusts the gate potential when the primary current exceeds the set value. The current is limited by feedback loop control that makes IBGT unsaturated.
[0009]
In such a feedback loop control, it is necessary to prevent the collector current and the primary voltage from oscillating due to a phase shift caused by a loop round-trip transmission delay. Since the IGBT has a relatively large capacitance at the gate due to the influence of the gate oxide film, it is desirable to reduce the circuit resistance of the feedback loop as much as possible in order to reduce the phase shift.
[0010]
By the way, in this kind of ignition device, in addition to the above-described primary current limiting circuit, a circuit for cutting off the energization of the primary current is provided for the following various purposes. For example, a control circuit that cuts off the primary current in response to the ignition control signal, or when the ignition control signal continues beyond the set value (when the primary current continues above the set value), the primary current is forcibly Examples thereof include a continuous energization prevention circuit that cuts off and an overvoltage protection circuit that forcibly cuts off the primary current when the battery voltage rises abnormally. The primary current is cut off by dropping the gate voltage of the power switching element to a low level. Even when such an output terminal of a primary current interrupting circuit or a primary current limiting circuit is provided, it is necessary to deal with the problems (1) and (2) above. No one was proposed.
[0011]
An object of the present invention is to solve the above-described problems and to achieve both the reliability and the operational stability of the ignition device. Another object of the present invention is to make it possible to cope with the above problems with a compact circuit configuration even when the above-described continuous conduction prevention circuit and overvoltage protection circuit are added.
[0012]
[Means for Solving the Problems]
In order to achieve the above object, the present invention uses an IGBT as a power switching element used to energize / cut off a primary current of an ignition coil, and connects a Zener diode for IGBT protection between the collector and gate of the IGBT, In the ignition device including the primary current limiting circuit and the primary current cutoff circuit as described above,
The output terminal of the primary current cut-off circuit is connected to the gate of the IGBT through a resistor that applies a self-bias for collector voltage clamping to the IGBT by the Zener current of the Zener diode, while the primary current limiting circuit The output terminal is connected to the gate of the IGBT through a line having a resistance lower than that of the resistor.
[0013]
In addition, as an application thereof, the primary current cut-off circuit is forcibly applied when an abnormality occurs in the gate voltage, in addition to a control circuit that reduces the gate voltage of the IGBT to a low level according to the ignition control signal. Forcibly shuts down to a low level (for example, an overvoltage protection circuit that forcibly cuts off the IGBT and then the primary current by dropping the gate voltage to ground when the gate voltage becomes overvoltage due to an abnormality such as a battery power source, When the gate voltage is longer than the set value, it is equipped with a continuous current prevention circuit that forcibly cuts off the primary current by dropping the gate voltage to a low level. Then, it is proposed that this shared output terminal is connected to the gate of the IGBT through the resistor.
[0014]
With the above configuration, it is possible to sufficiently secure the self-bias gate resistance value used for the collector voltage clamp of the IGBT while meeting the demand for reducing the circuit resistance of the feedback loop of the primary current limiting circuit. .
[0015]
Accordingly, when the IGBT collector voltage becomes equal to or higher than the withstand voltage protection Zener voltage, the IGBT is self-biased by the Zener current, and the IGBT energization is re-energized to sufficiently suppress the Zener voltage rising rate dv / dt. The collector voltage can be clamped with a Zener voltage, and element breakdown can be prevented.
[0016]
In addition, since a feedback circuit for primary current control can be formed by setting a low resistance or zero external resistance between the gate of the IGBT and the output terminal of the primary current limiting circuit, the phase shift of the round-trip transmission delay can be reduced. The oscillation of the primary current and the primary voltage can be prevented.
[0017]
The primary current cut-off circuit is composed of circuits with multiple purposes (primary current cut-off for ignition control, primary current cut-off for overvoltage protection, primary current cut-off for preventing continuous energization, etc.) However, by sharing these output terminals and connecting them through the gate of the IGBT and the gate resistance element for clamping, the number of terminals of the IC can be reduced and the circuit configuration can be made compact. A simple ignition device can be provided.
[0018]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described with reference to the drawings.
[0019]
Prior to the description of the present embodiment, an example of a normal configuration of an ignition system for an internal combustion engine conventionally known will be described with reference to FIG.
[0020]
Reference numeral 1 denotes an ECU, 2 'denotes an ignition device (ignition drive circuit) for driving the ignition coil, 3 denotes an ignition coil, and 4 denotes an ignition plug.
[0021]
The ECU 1 includes a CPU 8 that calculates an ignition timing signal in accordance with the engine state. The output stage of the ECU 1 includes a PNP transistor 9, an NPN transistor 10, and a resistor 11.
[0022]
The ECU 1 turns on and off the transistors 9 and 10 with an appropriate ignition timing signal calculated by the CPU 8, and outputs high and low pulses (ignition control signal) to the ignition device 2.
[0023]
The ignition device 2 'includes a power transistor 5 including a withstand voltage protection Zener diode 5a, a current detection resistor 6, a current control (ignition coil primary current control) circuit 7 and an input resistor 12 mounted on the hybrid IC 13. The When the output signal (ignition control signal) of the ECU 1 changes from low to high, the power transistor 5 starts energization and a primary current flows through the primary coil of the ignition coil 3. When the ignition control signal is switched from a high signal to a low signal, the power transistor 5 is turned off, and a high voltage (ignition voltage) of several tens of kilovolts is generated in the secondary coil of the ignition coil 3. At this time, a high voltage of about 300 to 400 V is also induced on the primary coil side, and the power transistor 5 is protected by clamping the zener diode 5a for withstand voltage protection.
[0024]
The current control circuit 7 monitors the primary current value from the voltage value detected by the primary current detection resistor 6 and controls the primary current so as not to exceed a predetermined value.
[0025]
Next, the structure of the ignition device according to one embodiment of the present invention will be described with reference to FIG.
[0026]
In FIG. 2, 14 is an ignition coil, and 15 is an IGBT for energizing and interrupting a primary current flowing in the primary coil of the ignition coil.
[0027]
The ignition device value 2 is determined by the IBGT 15 including the withstand voltage protection Zener diode 15a, the hybrid IC substrate 60 (region surrounded by the broken line in FIG. 2), the control IC 70 mounted on the substrate 60 (region indicated by the dotted line in FIG. 2), and the like. It is configured.
[0028]
The IC 70 includes a Zener diode 19 for generating the power supply Vcc, a primary current limiting circuit 27 for limiting the primary current of the ignition coil 14, and an overvoltage that detects when the power supply voltage (battery voltage) exceeds a set value. The detection circuit 48, the transistor 50 that operates at the output of the overvoltage detection circuit 48, the ignition control signal input circuit 32, the IGBT control transistor 34 connected to the output stage, and the gate of the IGBT 15 at a high level for a predetermined time or more. When the voltage is applied and the IGBT 15 is in the continuous energization state (when the ignition control signal for energizing the primary current exceeds the set time or more), the continuous energization detection circuit 38 for detecting it and the transistor 41, the capacitor 40, The resistor 39 and the transistor 44 that operates when the continuous energization state is detected. .
[0029]
The transistors 50, 34 and 44 described above are NPN transistors, and their emitters are connected to the base of the final output transistor (NPN transistor) 36 through a common line.
[0030]
The transistor 36 is used when the overvoltage detection circuit 48 detects an abnormal increase in battery voltage, when the ignition control signal at the input terminal 29 is at a low level, and when the continuous energization detection circuit 38 detects continuous energization. The transistor is turned on via the transistors 50, 34, 44, and the gate voltage of the IGBT is dropped to a low level (ground) via the output terminal 37. Thereby, the primary current is cut off.
[0031]
Here, the overvoltage detection circuit 48 and the transistors 50 and 36 constitute an overvoltage protection circuit, and the input circuit 32, the transistors 34 and 36 constitute a control circuit corresponding to the ignition control signal, the resistor 39, the capacitor 40, and the continuous energization detection. The circuit 38 and the transistors 44 and 36 constitute a continuous energization prevention circuit. The overvoltage protection circuit, the control circuit, and the continuous energization prevention circuit constitute a primary current cutoff circuit, and the collector terminal 37 of the transistor 36 becomes the IC output terminal 37 of the primary current cutoff circuit. That is, the output terminal 37 serves as a shared output terminal for the above-described overvoltage protection circuit, control circuit, and continuous energization prevention circuit. The output terminal 37 of the primary current cutoff circuit is connected to the gate line 100 of the IGBT 15 via a collector voltage clamping resistor (gate resistance element) 21 described later. The overvoltage protection circuit and the continuous energization prevention circuit described above are also a forced cutoff circuit that forcibly cuts off the primary current.
[0032]
The hybrid IC board 60 has a battery terminal 16 connected to a battery power source, a gate terminal 22 connected to the gate of the IGBT 15, a terminal 29 for inputting an ignition signal, and a ground terminal 18 ', and the control IC 70 is mounted thereon. At the same time, resistors 17, 20, 21, 23, 24, 25, 30, 46 are formed around them. Of these, the resistor 21 becomes a gate resistor element for self-bias of the collector voltage clamp, and the resistor 23 becomes a resistor element for primary current detection. The substrate 60 is formed with wirings that become the gate line 100 and the emitter line 101 of the ICBT 15. The substrate 60 is a ceramic substrate, for example.
[0033]
Each terminal of the control IC 70 has the following connection mode. Vcc terminal 18 is connected to battery terminal 16 of substrate 60 through resistor 17. The input terminal 47 of the overvoltage detection circuit 48 is connected to the battery terminal 16 via the resistor 46. The input terminal 31 of the ignition signal input circuit 32 is connected to the ignition signal input terminal 29 of the substrate 60 through the protective resistor 30. The ground terminal 18 ″ is connected to the ground terminal 18 ′ of the substrate 60. The current detection terminal 27 ′ is connected to the primary current detection resistor 23 via the voltage dividing resistors 24 and 25. The output terminal 28 of the current limiting circuit is connected to the gate terminal 22 of the IGBT 15. The output terminal 37 of the primary current cutoff circuit is connected to the gate terminal 22 of the IGBT 15 via the gate resistance element 21.
[0034]
The power source of the ignition device 2 is taken from the battery terminal 16 and applied to the Zener diode 19 through the resistor 17 and the Vcc terminal 18 of the control IC, thereby generating a Vcc voltage. This Vcc potential is configured to be applied to the gate of the IGBT 15 via the input resistors 20 and 21 under the condition that the transistor 36 is OFF.
[0035]
The current detection resistor 23 is dropped by the primary current that flows when the IGBT is energized, and the voltage drop is divided by the resistors 24 and 25 and detected by the current limiting circuit 27.
[0036]
When the potential due to this voltage drop exceeds a predetermined value, the current limiting circuit 27 lowers the gate voltage of the IGBT 15 via the terminal 28, thereby forming a feedback control circuit for limiting the current by making the IGBT 15 unsaturated. .
[0037]
An ignition control signal from the ECU (corresponding to reference numeral 1 in FIG. 1) is input to the input circuit 32 via the protective resistor 30. The input circuit 32 is an inverting circuit in which hysteresis is given to the on-off threshold voltage. When the input voltage becomes a high level signal that is equal to or higher than the set threshold, a low level signal is output and the input voltage is set. A high level signal is output when the threshold value is below (low level signal).
[0038]
With this output, the transistors 42 and 34 in the next stage are driven through resistors 41 and 33, respectively. The transistor 42 is used for continuous energization detection.
[0039]
The overvoltage detection circuit 48 inputs the battery voltage via the resistor 46 and drives the transistor 50 via the resistor 49 when the battery voltage becomes equal to or higher than a set value.
[0040]
The continuous energization detection circuit 38 monitors and sets the time constant charge voltage composed of the resistor 39 and the capacitor 40 when the output of the input circuit 32 is at a low level (gate voltage high level; when primary current is energized). The transistor 44 is turned on via the resistor 43 when the value becomes equal to or greater than the value (in other words, equal to or longer than a predetermined time). Thereby, the gate voltage applied to the IGBT 15 is dropped from high to low level, and the continuous energization of the IGBT 15 is interrupted (the energization of the primary coil is interrupted).
[0041]
When the ignition signal output from the ECU is at a low level (the output of the input circuit 32 is at a high level), the charge voltage of the timer composed of the resistor 39 and the capacitor 40 is turned on. Discharged through transistor 42. When the ignition signal becomes high level (the output of the input circuit 32 is low level), the above-described CR time constant charging is started. That is, the timer is set / reset according to the signal level of the input circuit 32.
[0042]
The collectors of the transistors 34, 44 and 50 are pulled up to the Vcc power supply via resistors 35, 45 and 51, respectively. The transistors 34, 44, and 50 are all primary coil current cutoff transistors, and if any one of these transistors is turned on, the final stage transistor 36 is turned on, whereby the current in the primary coil is reduced. It is designed to be blocked. That is, the transistors 34, 44, and 50 share the switching element 36 for current interruption at the final stage.
[0043]
By separating the output terminal 37 of the primary current cutoff circuit and the output terminal 28 of the primary current limiting circuit 27, the terminals 37 and 28 are separately connected to the gate line 100 of the IGBT 15. Further, the output terminal 28 of the primary current limiting circuit 27 is connected to the gate line 100 at a position closer to the gate of the IGBT 15 than the output terminal 37 of the primary current cutoff circuit. A gate resistor 21 for collector clamping is interposed between the connection point 37 ′ of the output terminal 37 and the connection point 28 ′ of the output terminal 28 in the gate line 100.
[0044]
Next, a series of operations of the present embodiment will be described with reference to waveforms (time charts) shown in FIG.
[0045]
In FIG. 3, 3 a is an ignition signal output from the ECU, 3 b is a gate voltage of the IGBT 15, 3 c is a collector current (primary current) flowing through the IGBT 15, and 3 d is a secondary voltage generated in the secondary coil of the ignition coil 14. Show.
[0046]
In the normal ignition of the sequence (1), since the input circuit 32 outputs high when the ignition signal is low, a current is applied to the base of the next stage transistor 34 via the resistor 33, and the transistor 34 is turned on. As a result, the current limited by the collector resistor 35 is supplied to the final stage transistor 36 to turn on the transistor 36. As a result, the gate voltage of the IGBT 15 becomes low, and the collector current (primary current) of the IGBT 15 is in a non-energized state.
[0047]
In this state, since the transistor 42 is also ON, the charge voltage of the time constant timer constituted by the resistor 39 and the capacitor 40 is also low.
[0048]
When the ignition signal rises and becomes equal to or higher than the on-threshold voltage, the input circuit 32 outputs low, so that the transistors 34 and 36 are turned off, the IGBT gate voltage becomes high, and the primary current is passed.
[0049]
Further, the transistor 42 is turned off, and the voltage of the capacitor 40 is Vc = V (1-e-(t / R × C)The battery is charged with a time constant defined by When the collector current is energized, the primary current of the ignition coil 14 rises with a time constant due to the primary inductance and the primary resistance.
[0050]
The ignition control signal (ignition signal) becomes low at the ignition timing calculated by the ECU. At this time, when the ignition signal falls below the off-threshold, the transistors 34 and 36 are turned on, the gate voltage of the IGBT 15 becomes low, the IGBT 15 is turned off, the primary current is rapidly cut off, and the secondary of the ignition coil 14 is cut off. A secondary voltage of several tens of kilovolts is induced on the side. The secondary voltage varies depending on the specification of the ignition coil, but is usually a voltage of 30 kV to 45 kV. At the same time, the transistor 42 is turned on to extract the charge from the capacitor 40, and the time constant timer is reset.
[0051]
FIG. 3 shows a waveform in a state where the high voltage end of the ignition coil is detached from the spark plug and does not spark. This is because a state in which the gate voltage described later is clamped appears remarkably.
[0052]
When the secondary voltage is generated, a voltage corresponding to the turn ratio of the primary coil and the secondary coil with respect to the generated voltage (secondary voltage) of the ignition coil 14 (here, this voltage is referred to as a noise voltage) at the collector of the IGBT 15. May occur). This noise voltage is a high voltage of about 666 V, for example, when the ignition coil has a turns ratio of 60 and the secondary voltage is 40 kV. If this is applied to the IGBT collector as it is, the IGBT 15 is damaged. Therefore, in a normal ignition IGBT, a Zener diode 15a for clamping of 350 V to 500 V is provided between the collector and gate of the IGBT 15 so that the collector voltage does not exceed the element withstand voltage.
[0053]
The collector voltage is clamped by the Zener diode 15a and does not rise any further.
[0054]
The operation principle of the collector clamp is that when the collector voltage exceeds the Zener voltage, a Zener current flows (the Zener current flows to the ground via the gate resistor 21, the terminal 37, and the transistor 36), thereby the gate resistor 21 provided at the gate. When this voltage is generated and rises to the ON operation voltage of the IGBT 15, the IGBT 15 is biased and re-energized to clamp the collector potential.
[0055]
Next, a case where the ignition signal becomes a high level for a set time or more and the IGBT is in a continuous energization state will be described. In FIG. 3, this state is indicated by the sequence (2).
[0056]
In the continuous energization of sequence (2), the ignition signal is turned on, the IGBT gate voltage becomes high and the collector current (primary current) is energized, and the voltage of the capacitor 40 is charged with a time constant.
[0057]
When the collector current of the IGBT 15 rises due to continuous energization and flows to the current limit value, the current limit circuit 27 operates first to make the IGBT unsaturated. As a result, the gate voltage drops and the collector current (primary current) is limited.
[0058]
The primary current limit is a feedback control circuit that detects a voltage generated in the current detection resistor 23 connected to the emitter of the IGBT 15 and controls the gate of the IGBT 15 to be in an unsaturated state. If the phase shift due to the round-trip transmission delay of the feedback loop becomes large, the collector current and the primary voltage may oscillate.
[0059]
Since the gate of the IGBT 15 has a capacitance due to its MOS structure, the phase shift increases due to the capacitance when the resistance of the IGBT gate forming the feedback loop increases. In order to reduce this phase shift, it is desirable that the resistance between the output terminal 28 of the primary current limiting circuit and the gate of the IGBT 15 be directly controlled by making the resistance as small as possible.
[0060]
Therefore, in this embodiment, the gate resistor 21 for self-bias of the IGBT 15 is removed from the primary current limiting feedback loop system. Therefore, the gate resistor 21 is not disposed between the gate terminal 22 of the IGBT 15 and the output terminal 28 of the primary current limiting circuit, and the output terminal 28 and the output terminal of the current interrupt system (also used as an IGBT self-bias terminal) 37) are separated (separated as independent terminals), and the gate resistor 21 is provided between the current limiting terminal 28 and the current interrupting system terminal 37. In this way, the output terminal 37 of the primary current cut-off circuit is connected to the gate of the IGBT 15 via the gate resistance element 21 for securing the self-bias of the IGBT 15, while the output terminal of the primary current limiting circuit 27 is connected. 28 is connected to the gate of the IGBT 15 through a line having a resistance lower than that of the gate resistance element 21 and can prevent oscillation of the primary current and voltage.
[0061]
When the current limiting state at the time of continuous energization is continued and the potential of the capacitor 40 rises to a set value, the continuous energization detection circuit 38 turns on the transistors 44 and 36 via the resistor 43 and sets the gate voltage of the IGBT 15 to a low level. To.
[0062]
As a result, the collector current is rapidly cut off, and a high voltage is induced on the secondary side of the ignition coil 14. At the same time, the above-described noise voltage is generated at the collector of the IGBT 15. However, when the voltage of the gate resistor 21 rises to the on-operation voltage of the IGBT 15 due to the Zener current generated thereby, the IGBT 15 is biased and re-energized, whereby the collector voltage Clamp.
[0063]
Although not described as an operation waveform, when an abnormality occurs and the battery voltage rises and the overvoltage detection circuit 48 operates, the transistors 50 and 36 are turned on and the gate voltage of the IGBT 15 is made low. At this time, if the collector current is energized, the collector current is rapidly cut off by this operation, and a high voltage is induced on the secondary side of the ignition coil 14. At the same time, a high voltage (noise voltage) is induced in the collector of the IGBT 15, and this noise voltage re-energizes the IGBT 15 and clamps it as described above.
[0064]
In order for the Zener diode to operate in the IGBT 15, the gate resistance 25 is required, and the value of the gate resistance needs to be determined in consideration of the Zener operating resistance and the Zener current. When the Zener operates in the absence of gate resistance, the Zener voltage increases by the operating resistance due to the Zener current and exceeds the IGBT element breakdown voltage. Further, in this state, if the voltage increase rate dv / dt is rapid, the growth of the depletion layer formed in the oxide film is not in time, and a sufficient breakdown voltage cannot be secured, which may lead to destruction. On the other hand, the primary current limiting circuit has a problem that the gate resistance cannot be increased due to the delay in the round-trip transmission of the feedback loop. Therefore, it is effective to configure the circuit as in this embodiment.
[0065]
【The invention's effect】
According to the present invention, in an ignition device using an IGBT, the primary current limiting function is stabilized and the collector voltage clamping operation at the time of the primary current interruption is made compatible to prevent the element from being damaged, and the reliability is improved. A high ignition device can be supplied.
[Brief description of the drawings]
FIG. 1 is a circuit diagram showing a configuration example of a conventional ignition device known conventionally.
FIG. 2 is a circuit diagram showing an embodiment of the present invention.
FIG. 3 is a time chart showing operation waveforms of the embodiment.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... ECU, 2 ... Ignition device, 3, 14 ... Ignition coil, 4 ... Spark plug, 6, 23 ... Resistance for primary current detection, 7, 27 ... Primary current limiting circuit, 15 ... IGBT, 15a ... Zener diode 21 ... Clamping gate resistance element, 22 ... Gate terminal, 28 ... Output terminal of primary current limiting circuit, 28 '... Connection point of output terminal 28, 32 ... Ignition signal input circuit, 37 ... Primary current cut-off circuit Output terminal 37 '... Connection point of output terminal 37, 38 ... Continuous energization detection circuit, 48 ... Overvoltage detection circuit, 60 ... Hybrid IC substrate, 70 ... Control IC, 100 ... Gate line.

Claims (4)

  1. An ignition device that energizes / cuts off a primary current that flows through an ignition coil by using a power switching element that operates in accordance with an ignition control signal. The ignition device detects a primary current and restricts the primary current from flowing beyond a predetermined value. An ignition device comprising: a primary current limiting circuit that performs a primary current cut-off circuit that cuts off a primary current by dropping a gate voltage of the power switching element to a low level;
    The power switching element is an insulated gate bipolar transistor (hereinafter referred to as IGBT), and a Zener diode for IGBT protection is connected between the collector and gate of the IGBT,
    The output terminal of the primary current cut-off circuit is connected to the gate of the IGBT through a resistor that applies a self-bias of the collector voltage clamp to the IGBT by the Zener current of the Zener diode, while the output terminal of the primary current limiting circuit The output terminal is connected to the gate of the IGBT through a gate line having a resistance lower than that of the resistor .
    The primary current cut-off circuit includes a control circuit that lowers the gate voltage of the IGBT to a low level according to an ignition control signal, and forcibly reduces the gate voltage of the IGBT to a low level when an abnormality occurs in the gate voltage. An internal combustion engine characterized in that the output terminal of the control circuit and the forced cutoff circuit is shared, and the shared output terminal is connected to the gate line via the resistor. Ignition device.
  2.   The primary current limiting circuit and the primary current cut-off circuit are formed in one IC having their output terminals separated, and the output terminals are connected to an IGBT gate line provided on a substrate on which the IC is mounted. And the output terminal of the primary current limiting circuit is connected to the gate line at a position closer to the gate of the IGBT than the output terminal of the primary current interrupting circuit, and the output of the primary current limiting circuit in the gate line The ignition device for an internal combustion engine according to claim 1, wherein the resistor is provided between a terminal connection point and an output terminal connection point of the primary current cutoff circuit.
  3. The forced cutoff circuit includes a continuous energization preventing circuit for forcibly dropping the gate voltage to a low level when the gate voltage is at a high level for a set time or more, and the gate voltage when the battery voltage is at a set value or more. the ignition apparatus for an internal combustion engine according to claim 1, wherein consisting overvoltage protection circuit to drop to a low level.
  4. The ignition device for an internal combustion engine according to any one of claims 1 to 3 , wherein the resistance is 100Ω or more.
JP2001032272A 2001-02-08 2001-02-08 Ignition device for internal combustion engine Active JP3762231B2 (en)

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JP2001032272A JP3762231B2 (en) 2001-02-08 2001-02-08 Ignition device for internal combustion engine

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Publication number Priority date Publication date Assignee Title
JP5423378B2 (en) 2009-12-15 2014-02-19 三菱電機株式会社 Power semiconductor device for igniter
JP5454635B2 (en) * 2012-08-02 2014-03-26 富士電機株式会社 Igniter system
JP5454634B2 (en) * 2012-08-02 2014-03-26 富士電機株式会社 Igniter system
JP6376188B2 (en) * 2015-11-04 2018-08-22 株式会社デンソー Igniter

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