JPH10318109A - Ignition device for capacitor discharge type internal combustion engine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an ignition device for a capacitor discharge type internal combustion engine, for charging an igniting capacitor with a DC-DC converter as a power source without inducing spikelike high voltage in the primary coil of an ignition coil, and performing an AC discharge at the time of ignition action. SOLUTION: In this ignition device for a capacitor discharge type internal combustion engine, diodes 7, for constituting an AC discharge circuit, are connected to both the ends of a thyristor 5, for discharging the electric charge of an igniting capacitor 3; and an AC discharge is performed at the time of ignition action. A switch circuit 9, for constituting a damper circuit, is provided which is constituting a damper circuit for bypassing a charging current from the primary coil 4a of an ignition coil 4 in charging the capacitor 3 by output from a DC-DC converter 2, and repealing the damper circuit to permit an AC discharge at the time of ignition action.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a capacitor discharge type internal combustion engine ignition device which charges an ignition capacitor with an output voltage of a DC-DC converter.

[0002]

2. Description of the Related Art As a capacitor-discharge-type internal combustion engine ignition device, a device in which an ignition capacitor is charged with an output voltage of a DC-DC converter using a battery or the like as a power source has been widely used.

[0003] An ignition device of this type includes an ignition coil, an ignition capacitor connected in series to a primary coil of the ignition coil, and a voltage across a series circuit of the primary coil and the ignition capacitor. , A DC-DC converter for charging the ignition capacitor, a discharge thyristor connected in parallel to a series circuit of the primary coil of the ignition coil and the ignition capacitor, and a discharge thyristor for discharging at the ignition position of the internal combustion engine. An ignition position control device that supplies an ignition signal to the thyristor to conduct the thyristor, and when the ignition signal is generated, conducts the discharge thyristor to transfer the charge of the ignition capacitor to the primary of the discharge thyristor and the ignition coil. By discharging through the coil, a high voltage for ignition is generated in the secondary coil of the ignition coil.

In this type of ignition device, in order to ensure the commutation of the discharge thyristor, the output of the DC-DC converter is stopped when the discharge thyristor is turned on, and after the commutation of the discharge thyristor is completed. The output of the converter is generated to charge the ignition capacitor.

In order to purify the exhaust gas of the internal combustion engine and to improve the combustion state under transient operating conditions during rapid acceleration / deceleration, diodes for an AC discharge circuit are connected in anti-parallel to both ends of the discharge thyristor. Then, a so-called AC discharge is generated in which the charge of the ignition capacitor is alternately discharged to the primary coil of the ignition coil at each ignition, so that a plurality of sparks are generated at one ignition. I have.

FIG. 4 shows an example of a circuit of a conventional capacitor discharge type internal combustion engine ignition device provided with a diode for constituting an AC discharge circuit. In FIG. 1, reference numeral 1 denotes a battery as a power supply, and 2 denotes a D for boosting the output voltage of the battery 1.
C-DC converter, 3 is an ignition capacitor charged with the output voltage of the DC-DC converter 2, 4 is an ignition coil having a primary coil 4a and a secondary coil 4b connected in series to the ignition capacitor 3. Reference numeral 5 denotes a discharge thyristor connected in parallel to a series circuit of the ignition capacitor 3 and the primary coil 4a of the ignition coil. Reference numeral 6 denotes an ignition position of the internal combustion engine.
t, and a boost operation control signal Vs to the DC-DC converter 2; 7 is a diode for AC discharge circuit configuration connected in anti-parallel to the discharge thyristor 5;
Is a spark plug attached to a cylinder of an internal combustion engine (not shown) to which a high voltage induced in the secondary coil 4b of the ignition coil is applied. A resistor R1 is connected in parallel between the gate and cathode of the discharge thyristor 5. Have been.

The DC-DC converter 2 includes a step-up transformer 201 and a circuit between the drain and the source.
A field-effect transistor FET as a chopper switch connected in series to the primary coil of the FE, generates a pulse voltage, and uses the pulse voltage as a drive signal Vp as an FE signal.
An oscillation circuit 202 to be applied to the gate of T;
Rectifier D2 for rectifying the voltage induced in the secondary coil
And the driving signal V generated by the oscillation circuit 202.
By turning on and off the field effect transistor FET with p to interrupt the primary current of the step-up transformer 201, a boosted pulse-like voltage is generated in the secondary coil of the step-up transformer. D1 is a parasitic diode formed between the drain and source of the field effect transistor.

The ignition position control device 6 includes a signal coil 601 for generating a pulse signal at a predetermined rotational angle position of the engine.
And an ignition position control circuit 602. An ignition position control circuit 602 calculates an ignition position of the engine (a rotation angle position of a crank angle at which an ignition operation is performed) using rotation speed information and rotation angle position information of the internal combustion engine obtained from an output signal of the signal coil 601. And the calculated ignition position θ
2, the ignition signal Vt is applied to the gate of the discharging thyristor 5 (FIG. 5).
Give A).

The ignition position control circuit 602 also has a DC-D
The boosting operation control signal Vs (FIG. 5B) is applied to the transmission circuit 202 of the C converter 2. The step-up operation control signal Vs becomes a low-level step-up operation inhibition signal Vs1 at a position θ1 advanced in phase from the ignition position θ2 and stops the oscillation of the oscillation circuit 202, so that the commutation of the discharge thyristor 5 fails. To prevent The boosting operation control signal VS becomes a high-level boosting operation permission signal Vs2 at the rotation angle position θ4 immediately after the commutation of the discharge thyristor 5 is completed, and restarts the oscillation of the oscillation circuit 202.

When the boosting operation permission signal Vs2 is given to the oscillation circuit 202, the oscillation circuit 202 generates a pulse-like drive signal Vp, so that the boosting operation of the DC-DC converter 2 is started, and the boosting transformer 201 A pulse-like voltage generated on the next side is induced. Due to this voltage, a pulse-like charging current Ic flows through the series circuit of the ignition capacitor 3 and the primary coil 4a of the ignition coil as shown in FIG. 5B, and the ignition capacitor 3 is charged to the polarity shown in FIG. You.
As a result, the voltage Vc between both ends of the series circuit of the ignition capacitor 3 and the primary coil 4a of the ignition coil is changed as shown in FIG.
Ascending as shown in the figure. Rotation angle position θ1
When the boosting operation inhibition signal Vs1 is given to the oscillation circuit 202, the output of the DC-DC converter 2 stops. Thereafter, the ignition signal Vt is supplied to the discharge thyristor 5 at the ignition position θ2.
Is applied, the discharge thyristor conducts, and the electric charge of the ignition capacitor is discharged in the direction of the solid arrow shown in the drawing through the path of the capacitor 3, the thyristor 5, the primary coil 4a, and the capacitor 3. As a result, a high voltage is induced in the secondary coil 4b of the ignition coil, a spark is generated in the ignition plug 8, and the ignition capacitor 3 is charged to a polarity opposite to the illustrated polarity. The charge of the ignition capacitor 3 charged to the polarity opposite to the illustrated polarity is then discharged in the direction of the dashed arrow shown in the drawing through the path of the capacitor 3 → the primary coil 4a → the diode 7 for the AC discharge circuit → the capacitor 3. As a result, a spark of the opposite polarity is generated in the ignition coil 4b. Similarly, the electric charge of the ignition capacitor 3 is alternately changed and discharged through the primary coil 4a of the ignition coil, thereby causing the ignition plug 8 to perform AC discharge a plurality of times.

[0011]

In the conventional capacitor discharge type internal combustion engine ignition system shown in FIG. 4, the ignition capacitor 3 and the ignition coil are driven by a pulse-like voltage output from the DC-DC converter 2 having a sharp rise. Primary coil 4a
As shown in FIG. 5 (D), the charging current Ic in the form of a pulse flows through the primary coil 4a having the inductance L1, so that an induced voltage of Vcp = L1 (dIp / dt) is generated at both ends of the primary coil 4a. This induced voltage is applied as a spike-like high voltage Vcp between the anode and the cathode of the discharge thyristor 5 as shown in FIG. 5C, so that the discharge thyristor 5 may break over and abnormal ignition may occur. there were.

If a damper diode is connected in parallel with the primary coil so that the charging current flowing from the DC-DC converter to the ignition capacitor is bypassed from the primary coil of the ignition coil, a spike-like charging current Ic is generated. Although a voltage is not generated and applied to the discharge thyristor, in this case, even if a diode for forming an AC discharge circuit is provided, it becomes impossible to perform AC discharge.

An object of the present invention is to enable AC discharge to be performed at the time of ignition, and to use a spike-like high voltage at the discharge thyristor when charging the ignition capacitor with the output voltage of the DC-DC converter. An object of the present invention is to provide a capacitor-discharge-type internal combustion engine igniter in which no voltage is applied to improve ignition performance and reliability.

[0014]

According to the present invention, there is provided an ignition coil, an ignition capacitor connected in series to a primary coil of the ignition coil, and an output voltage of a battery that is boosted and the boosted voltage is ignited. A DC-DC converter applied to both ends of a series circuit of a primary coil of an ignition coil and a primary coil of an ignition coil is connected in parallel to a series circuit of a primary coil of the ignition coil and a primary capacitor of the ignition coil, and an ignition signal is given. A thyristor for discharging the electric charge of the ignition capacitor through the primary coil when the electric current flows through the primary coil, an diode for forming an AC discharge circuit connected in anti-parallel to both ends of the thyristor for discharging, and a thyristor for discharging at the ignition position of the internal combustion engine And an ignition position control unit for giving an ignition signal to the ignition device.
The DC-DC converter used in this type of ignition device is configured to stop output when the discharge thyristor is turned on, generate an output after the commutation of the discharge thyristor is completed, and charge the ignition capacitor. I have.

According to the present invention, there is provided a switch circuit for forming a damper circuit having a switch element connected in parallel to a primary coil of an ignition coil. This switch circuit for tamper circuit configuration forms a damper circuit that turns on the switch element when the ignition capacitor is charged and passes a charge current flowing from the DC-DC converter through the ignition capacitor to the primary coil, and discharges the charge current. When the switch is turned on, the switch element is turned off to disable the damper circuit.

With the above configuration, when charging the ignition capacitor, the pulsed charging current flowing from the DC-DC converter through the ignition capacitor flows through the switch circuit for the damper circuit configuration that is in the ON state. A pulse-like current can be prevented from flowing through the primary coil of the ignition coil, and a spike-like high voltage is induced in the primary coil, thereby preventing a spike-like high voltage from being applied to both ends of the discharge thyristor. be able to.

Further, when the discharge thyristor is turned on, the switch circuit for damper circuit configuration is turned off, so that the discharge current flowing through the primary coil of the ignition coil during the ignition operation is alternated, so that the AC discharge can be performed. .

In a capacitor discharge type ignition device in which an ignition capacitor is charged by a DC-DC converter, an ignition position control device stops the output of the DC-DC converter at a position where the phase is advanced from the ignition position of the internal combustion engine. After the step-up operation inhibition signal is generated, an ignition signal is generated at the ignition position, and the DC-D signal is generated at a position delayed in phase from the ignition position.
It is often configured to generate a boosting operation permission signal for permitting the generation of the output of the C converter. When the ignition position control device is configured as described above, the damper circuit configuration switch circuit configures the damper circuit by turning on the switch element while the boost operation permission signal is generated,
The switch element is turned off when the boosting operation prohibition signal is generated, and the damper circuit is disabled.

The switch circuit for damper circuit configuration is DC-
A damper circuit configuration thyristor that is connected in parallel to the primary coil in a direction that exhibits a forward direction with respect to a charging current flowing from the DC converter through the ignition capacitor and that is turned on with a boosting operation permission signal as a trigger signal; The configuration can be made by providing a thyristor conduction holding circuit for flowing a current equal to or greater than the holding current to the damper circuit forming thyristor when the boosting operation permission signal is generated.

As described above, when the thyristor conduction holding circuit is provided so that a current equal to or larger than the holding current flows through the thyristor for forming the damper circuit when the boosting operation permission signal is generated, the charging of the ignition capacitor is prevented. Even if the current is a pulse-shaped current with a steep rise, the thyristor for damper circuit configuration can be stably turned on, and the damper circuit can be surely configured while the boosting operation permission signal is generated.

[0021]

FIG. 1 shows an example of the configuration of an ignition device according to the present invention. In FIG. 1, the same parts as those in FIG. 4 are denoted by the same reference numerals.

In FIG. 1, 1 is a battery, and 2 is a DC-DC converter for boosting the output voltage of the battery 1. The DC-DC converter 2 includes a step-up transformer 201
A field-effect transistor FET as a chopper switch in which a drain-source circuit is connected in series to the primary coil of the step-up transformer, and an oscillation circuit 202 that supplies a pulsed drive signal Vp to the gate of the field-effect transistor. And the oscillation circuit 202 outputs the drive signal Vp
When the driving signal Vp disappears, the primary current is cut off by turning on the field effect transistor FET to turn on the FET when the driving signal Vp disappears. Thus, a boosted pulse voltage is generated on the secondary side of the boost transformer 201.

The ignition coil 4 has a primary coil 4a and a secondary coil 4b, one end of which is grounded. One end of the ignition capacitor 3 is connected to a non-ground side terminal of the primary coil 4a. The output voltage of the DC-DC converter 2 is applied to both ends of a series circuit of the ignition capacitor 3 and the primary coil 4a. Each time the DC-DC converter 2 outputs a pulse voltage, the ignition capacitor 3 is shown. Is charged to the polarity.

A discharge thyristor 5 is connected in parallel with a series circuit of the primary coil 4a of the ignition coil and the ignition capacitor 3, and a resistor R1 is connected between the gate and cathode of the thyristor 5. The discharge thyristor 5 conducts when the ignition signal Vt is applied to its gate, and discharges the charge of the ignition capacitor 3 through the primary coil 4a. Due to the discharge of the capacitor, a high voltage is generated in the secondary coil 4b of the ignition coil, and a spark discharge is generated in the ignition plug 8. A diode 7 for forming an AC discharge circuit is connected in anti-parallel between both ends of the discharge thyristor 5.

The ignition position control device 6 includes an ignition signal Vt for triggering the discharge thyristor 5 and a boost operation control signal Vs for controlling start and stop of oscillation of the oscillation circuit 202.
And generate.

The illustrated ignition position control device 6 is provided in a signal generator mounted on the internal combustion engine, and generates a pulse signal at a predetermined rotational angle position of the engine, for example, at a maximum advance position and a minimum advance position. It comprises a generated signal coil 601 and an ignition position control circuit 602 which receives an output of the signal coil 601 as an input and outputs an ignition signal and a boost operation control signal.

The ignition position control circuit 602 includes a signal coil 6
01 to calculate the ignition position of the internal combustion engine based on the rotation angle information and rotation speed information of the engine obtained from the output signal,
As shown in FIG. 2A, the ignition signal Vt is output at the calculated ignition position .theta.2 and the boost operation control signal Vs is output. As shown in FIG. 2B, the boosting operation control signal Vs is at a low level at the rotation angle position θ1 whose phase is advanced from the ignition position θ2, and immediately after the commutation of the discharge thyristor 5 is completed. This signal is set to a high level state at the rotation angle position (a position delayed in phase from the ignition position) θ4. The low-level boost operation control signal Vs is used as a boost operation inhibition signal Vs1, and the high-level boost operation control signal Vs is used as a boost operation permission signal Vs2.

The boost operation control signal Vs is supplied to an oscillation control terminal of the oscillation circuit 202 of the DC-DC converter 2.
When the boosting operation inhibition signal Vs1 is given to the oscillation circuit 202, the oscillation circuit stops the oscillation and the drive signal Vp
Is stopped, the boost operation of the DC-DC converter 2 is stopped. The boosting operation permission signal V
When s2 is given, the FET is turned on and off by the pulse signal Vp output from the oscillation circuit 202, so that the boosting operation is performed, and the DC voltage boosted from the secondary coil of the boosting transformer 201 through the diode D2. Is output.

Reference numeral 9 denotes a switch circuit for forming a damper circuit. The switch circuit 9 includes a switch element 901 connected in parallel to the primary coil 4a of the ignition coil 4, and switches when the ignition capacitor 3 is charged. Element 901
Is turned on, the DC-DC converter 2
From the primary coil 4a of the ignition coil to form a damper circuit that bypasses the charging current flowing from the ignition coil 3 through the ignition capacitor 3, and the switch element 90 when the discharge thyristor 5 is conductive.
1 is turned off to invalidate the damper circuit.

In the example shown in FIG. 1, the switch element 901 is constituted by a damper circuit forming thyristor SCR1 provided so as to exhibit a forward direction with respect to a charging current flowing from the DC-DC converter 2 through the ignition capacitor 3. ing. The cathode of the thyristor SCR1 is grounded, and the anode is a diode D in the same direction as the thyristor.
3 is connected to the non-ground terminal of the primary coil of the ignition coil. A resistor R2 is connected in parallel between the gate and cathode of the thyristor SCR1 for damper circuit configuration.
The boost operation control signal Vs output from the ignition position control device 6 is applied to the gate of the thyristor SCR1.
When the boost operation control signal Vs is at a high level (when the boost operation permission signal Vs2 is generated), the thyristor SCR1 for damper circuit configuration is turned on to configure a damper circuit, and the boost operation control signal When Vs is at a low level (when the boosting operation inhibition signal Vs1 is generated), the damper circuit configuration thyristor SCR1 holds the off state and invalidates the damper circuit.

When the charging current Ic of the ignition capacitor 3 is a pulse-like current having a sharp rise as shown in FIG. 2D when the boosting operation permission signal Vs2 is generated,
A thyristor conduction holding circuit 902 is further provided in the damper circuit configuration switch circuit 9 so that the damper circuit configuration thyristor SCR1 can stably maintain the ON state and continue to reliably configure the damper circuit. ing.

The thyristor conduction holding circuit 902 includes a diode D4, resistors R3 and R4, and transistors Tr1 and T4.
When the boosting operation permission signal Vs2 is given from the ignition position control device 6 to the base of the transistor Tr2, the transistors Tr2 and Tr1 are turned on and off, respectively, and the resistance of the battery 1 is reduced. A current Ih greater than the holding current is supplied to the thyristor SCR1 through R3 and the diode D4. Therefore, when the boost operation permission signal Vs2 is generated, the thyristor SCR1
Then, as shown in FIG. 2 (E), a current Id in which the charging current Ic of the ignition capacitor 3 is superimposed on the current Ih equal to or larger than the holding current flows, and the thyristor SCR1 is reliably kept in the ON state. When a low-level boosting operation inhibition signal Vs1 is applied to the base of the transistor Tr2, the transistors Tr2 and Tr1 are turned off and on, respectively. Therefore, the current flowing from the battery 1 through the resistor R3 flows from the thyristor SCR1 through the transistor Tr1 to the bypass. Is done. At this time, since no trigger signal is given to the thyristor SCR1, the thyristor SCR1 is kept off while the boost operation inhibition signal Vs1 is generated, and the damper circuit is disabled.

Next, the operation of the ignition device of FIG. 1 will be described with reference to FIG.

A position θ1 whose phase is ahead of the ignition position θ2
When the ignition position control device 6 generates the boosting operation inhibition signal Vs1, the oscillation circuit 202 stops oscillating.
C converter 2 stops the boost operation. When the boost operation inhibition signal Vs1 is generated, the thyristor SCR1 for damper circuit configuration keeps the off state, and the damper circuit becomes invalid.

When the ignition signal Vt is generated from the ignition position control device 6 at the ignition position θ2 of the internal combustion engine and the discharge thyristor 5 is turned on, the electric charge of the ignition capacitor 3 charged to the polarity shown in FIG. Discharge occurs in the path of the capacitor 3, the discharge thyristor 5, the primary coil 4a, and the capacitor 3, and a discharge current i1 flows in the primary coil 4a in the direction indicated by the solid line arrow. Thereby, the secondary coil 4b of the ignition coil
, A spark discharge current i2 flows in the spark plug 8 in one direction. The capacitor 3 is charged to a polarity opposite to the polarity shown by the discharge current i1 of the capacitor 3 flowing through the primary coil 4a in the direction indicated by the solid line arrow. When this charging is completed, discharge is performed in the path of the capacitor 3 → the primary coil 4a → the diode 7 for AC discharge configuration → the capacitor 3, and the current i1 flows in the primary coil 4a in the direction of the dashed arrow shown in the figure. As a result, an induced voltage is generated in the secondary coil 4b of the ignition coil in the opposite direction, and a spark current i2 flows through the ignition plug 8 in the direction opposite to the direction of the arrow shown in the drawing. Since these operations are repeated, the primary coil 4 of the ignition coil
A plurality of alternating discharge currents flow through a, and AC ignition is performed.

FIGS. 3A and 3B show examples of the waveforms of the voltage V2 and the spark discharge current i2 across the spark plug 8 when AC ignition occurs.

After the commutation of the discharge thyristor 5 is completed, at the rotation angle position θ4 (a position delayed in phase from the ignition position θ2), the ignition position control device 6 sends the boosting operation permission signal Vs2
Occurs and the signal is given to the oscillation circuit 202,
The DC-DC converter 2 starts the boosting operation and outputs a voltage having a boosted pulse waveform. Further, since the boosting operation permission signal Vs2 is also supplied to the switch circuit 9 for damper circuit configuration, the thyristor SCR1 for damper circuit configuration is turned on, and is turned on by a current Ih equal to or greater than the holding current supplied from the thyristor conduction holding circuit 902. To form a damper circuit. Accordingly, the pulse-shaped charging current Ic (FIG. 2D) flowing through the ignition capacitor 3 by the output voltage of the DC-DC converter 2 is bypassed from the primary coil 4a of the ignition coil, and the diode D3 of the switch circuit 9 for damper circuit configuration is turned off. And the thyristor SCR1 for damper circuit configuration. Therefore, no spike-like voltage is generated due to the inductance of the primary coil 4a when charging the ignition capacitor 3, and the voltage Vc across the discharge thyristor 5 becomes spike-like as shown in FIG. A step-like waveform without the voltage.

At the position θ1 whose phase is advanced from the next ignition position θ2, the boosting operation inhibition signal V
When s1 occurs, the same operation as described above is repeated, and a damper circuit is formed when the ignition capacitor 3 is charged, and the damper circuit is invalidated when the ignition capacitor 3 is discharged.

As described above, in the ignition device of the present invention, the tamper circuit is formed when the ignition capacitor is charged so that the pulsed charging current does not flow through the primary coil of the ignition coil. When the battery is charged, a spike-like voltage with a sharp rise is applied to the discharging thyristor, thereby preventing the thyristor from breaking over. Also, when the internal combustion engine is ignited, the damper circuit is disabled and AC discharge is performed.
In this case, a plurality of spark discharges are caused to improve the ignition performance.

In the above example, a thyristor is used as the switch element 901 of the switch circuit for forming the damper circuit. However, the switch element may be any element capable of on / off control. It can also be used as a configuration switch element.

[0041]

As described above, according to the present invention, at the time of charging the ignition capacitor, a damper circuit that bypasses the charging current from the primary coil of the ignition coil is formed, and a spike-like high voltage is applied to the primary coil of the ignition coil. To stop the voltage from being induced,
Since the AC discharge circuit is configured by disabling the damper circuit at the time of ignition, an abnormal situation such that a high voltage is applied to the discharge thyristor when the ignition capacitor is charged and the thyristor breaks over does not occur. In addition, there is an advantage that the spark performance can be improved by performing the spark discharge a plurality of times at the time of ignition.

[Brief description of the drawings]

FIG. 1 is a circuit diagram showing a configuration example of an ignition device according to the present invention.

FIG. 2 is a waveform diagram showing voltage and current waveforms of respective parts of the ignition device shown in FIG.

FIG. 3 is a waveform diagram showing an example of a waveform of a discharge voltage and a discharge current obtained by the ignition device shown in FIG.

FIG. 4 is a circuit diagram showing a configuration example of a conventional ignition device.

FIG. 5 is a waveform diagram showing voltage and current waveforms of each part of the ignition device of FIG. 4;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Battery 2 DC-DC converter 201 Step-up transformer 202 Oscillation circuit 3 Ignition capacitor 4 Ignition coil 4a Primary coil 4b Secondary coil 5 Discharge thyristor 6 Ignition position control device 601 Signal coil 602 Ignition position control circuit 7 AC discharge circuit configuration Switch circuit 8 Ignition plug 9 Switch circuit for damper circuit configuration 901 Switch element 902 Thyristor conduction holding circuit FET Field effect transistor SCR1 Thyristor for damper circuit configuration Tr1, Tr2 Transistor D1, D3 Diode

Claims (3)

[Claims] An ignition coil, an ignition capacitor connected in series to a primary coil of the ignition coil, an output voltage of a battery is boosted, and the boosted voltage is applied to the primary of the ignition capacitor and the ignition coil. A DC-DC converter applied to both ends of a series circuit with a coil; a DC-DC converter connected in parallel to a series circuit of a primary coil of the ignition coil and a capacitor for ignition; A discharge thyristor that discharges the charge of the capacitor through the primary coil; an AC discharge circuit configuration diode connected in anti-parallel to both ends of the discharge thyristor; and an ignition signal to the discharge thyristor at an ignition position of the internal combustion engine. The DC-DC converter stops output when the discharging thyristor is turned on, In a capacitor discharge internal combustion engine ignition device configured to generate an output after the commutation of the discharge thyristor is completed and charge the ignition capacitor, the ignition thyristor is connected in parallel to a primary coil of the ignition coil The switching element is turned on when the ignition capacitor is charged.
A damper circuit configured to make a charging current flowing from the DC converter through the ignition capacitor bypass the primary coil, and the switch element is turned off when the discharging thyristor is turned on to disable the damper circuit; Discharge type internal combustion engine ignition device characterized by comprising a switch circuit for use. 2. An ignition coil, an ignition capacitor connected in series to a primary coil of the ignition coil, and an output voltage of a battery that is boosted while a boost operation permission signal is being generated. A DC-DC converter that applies a charging voltage to a series circuit of a primary coil and an ignition capacitor, and stops generating the charging voltage while a boosting operation inhibition signal is generated; and a primary coil of the ignition coil. A discharge thyristor that is connected in parallel to the series circuit of the ignition capacitor, conducts when an ignition signal is given, and discharges the charge of the ignition capacitor through the primary coil; and An AC discharge circuit forming diode connected in anti-parallel to both ends; and a step-up operation prohibiting signal generated at a position where the phase is advanced from the ignition position of the internal combustion engine. And an ignition position control device that generates the ignition signal at the ignition position and generates the boosting operation permission signal at a position delayed in phase from the ignition position. A switching element connected in parallel to the primary coil, wherein the switching element is turned on while the boosting operation permission signal is being generated, so that the DC-DC
A damper circuit for bypassing a charging current flowing from the converter through the ignition capacitor from the primary coil of the ignition coil, wherein the switch element is turned off when the boosting operation inhibition signal is generated, and the damper circuit is turned off. A capacitor discharge type internal combustion engine ignition device comprising a switch circuit for damper circuit configuration for invalidating a circuit. 3. An ignition coil, an ignition capacitor connected in series to a primary coil of the ignition coil, and an output voltage of a battery which is increased while a boost operation permission signal is being generated. A DC-DC converter that applies a charging voltage to a series circuit of a primary coil and an ignition capacitor, and stops generating the charging voltage while a boosting operation inhibition signal is generated; and a primary coil of the ignition coil. A discharge thyristor that is connected in parallel to the series circuit of the ignition capacitor, conducts when an ignition signal is given, and discharges the charge of the ignition capacitor through the primary coil; and An AC discharge circuit forming diode connected in anti-parallel to both ends; And an ignition position control device that generates the ignition signal at the ignition position and generates the boosting operation permission signal at a position delayed in phase from the ignition position. For a damper circuit configuration which is connected in parallel to the primary coil in a direction in which the charging current flowing from the DC-DC converter through the ignition capacitor is directed in a forward direction, and is turned on with the boosting operation permission signal as a trigger signal A switch circuit for damper circuit configuration comprising a thyristor and a thyristor conduction holding circuit for supplying a current equal to or greater than a holding current to the damper circuit configuration thyristor when the boosting operation permission signal is generated. Discharge type internal combustion engine ignition device.