JP3336400B2 - Condenser type ignition device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a condenser ignition device suitable for a motorcycle or the like.

[0002]

2. Description of the Related Art FIGS. 3 and 4 are conventional circuit diagrams, and I is a converter.
BAT is a battery, D1 is a diode, C1 is an input capacitor, and T1 is a transformer.
A primary winding Np, a base winding NB, and an output winding NS are provided.
Is connected to a control transistor Q2 via a base resistor R2. Reference numeral II denotes a main circuit. (2) A diode D2 for rectifying the output voltage of the output winding NS, a capacitor C0 charged by the rectified output, and a thyristor S1 for discharging the charge of the capacitor C0 to the ignition coil IGN. It is configured. In the ignition coil IGN, N1 is a primary coil, N2 is 2
The next coil, SP, is a spark plug. Next, the control circuit turns on the thyristor S1 by the timing signal of the pulsar coil PC in the control circuit, and simultaneously turns on the control transistor Q2 to turn off the transistor Q1.
Stops the operation (oscillation) of the data. In FIG. 3, D0 is a bypass diode, and in FIG. 4, D3 is a flywheel diode.

The operation of this circuit is as follows. First, the converter oscillates by turning on and off the transistor Q1 to generate an output voltage via the transformer T1, but a single ring type ringing choke converter is used. When the transistor Q1 is on, energy is supplied to the transformer T1.
And charge the capacitor C0 via the diode D2 when the capacitor is off. On the other hand, when a signal is sent from the control circuit CON through the pulsar coil PC, the thyristor S1 is turned on, and at the same time, the control transistor Q2 is turned on, so that the converter stops operating.
Is discharged through the thyristor S1 to the primary side N1 of the ignition coil, and through the secondary coil N2, the spark plug S
P causes a spark.

[0004]

In the circuit of FIG. 3, the charging of the capacitor C0 is performed through the bypass diode D0 without passing through the ignition coil N1, so that the charging efficiency is good, but the thyristor S1 and the ignition coil are discharged. Since the discharge is performed only through the N1 path, the ignition system can be operated only by the DC arc method, and the discharge duration is short. In FIG. 4, the path between the capacitor C0, the thyristor S1 and the coil N1 at the time of discharging, and the path between the capacitor C0 and the coil N1
Resonant discharge occurs on the path of the diode D3, and the ignition system is changed to an AC arc.
(3) Since charging is performed through the ignition coil N1, the charging efficiency increases as the switching frequency of the converter increases due to the influence of the inductance of the coil IGN. However, there is a disadvantage that the ignition energy is insufficient.

[0005]

The object of the present invention is to charge the main capacitor in a configuration free from the influence of the coil IGN when charging the main capacitor, and to charge the AC capacitor when discharging the main capacitor.
It is an object of the present invention to provide an ignition device for a two-wheeled vehicle or the like which can be performed in a vehicle-related state.

[0006]

According to the present invention, there is provided a main circuit for charging a capacitor by an output winding voltage of a converter and discharging a charge of the capacitor to an ignition coil through a first thyristor; In a capacitor type ignition device provided with a control circuit for making a first thyristor conductive and stopping the operation of the converter, a second thyristor is connected in series with the capacitor, and an output winding of the converter and the second thyristor are connected. And a capacitor to form a closed circuit .
And the second thyristor is provided by the voltage of the output winding.
Make the star conductive .

[0007]

FIG. 1 is a circuit diagram of an embodiment of the present invention, and FIG. 2 is a waveform diagram for explaining the operation thereof. In the figure, I is a switching part of the DC converter,
Circuit. CON is a control (timing) circuit which receives a timing signal from a pulser coil, stops switching of the DC converter, and simultaneously outputs an ignition signal to the thyristor S1. III is a switching circuit for making the secondary output terminal of the DC converter conductive or non-conductive. II is a main circuit for charging the output of the DC converter to the main capacitor C0 or discharging the energy of the main capacitor C0 to the ignition coil IGN.

Next, in order to operate them, when power is applied to the RCC circuit, switching (4) starts, and the primary and secondary sides NP and N are passed through the transformer T1.
Output of the specified value occurs at s. As a result, the current of the loop i0 flows through the output of the second output winding N3, and the thyristor S2 is turned on. At the same time, the Ns output causes the current of the loop i1 to flow, and the main capacitor C0 is charged with the ignition energy. Next, as shown in FIG. 4A, when a timing signal is input from the pulsar PC, the signal is passed through the control circuit.
A timing signal as shown in FIG. With this output, the transistor Q2 is turned on and the transistor Q1 is turned off, so that the RCC circuit is stopped, the output of N3 disappears, and the current of the loop i0 stops flowing, so that the thyristor S2 is turned off. This allows the NS terminal to
The main capacitor C0 is in an open state. Also, since the timing signal also sends a signal to thyristor S1,
The thyristor S1 conducts, and the electric charge of the main capacitor C0 is applied to the primary side N1 of the coil IGN through the loop i3. At this time, the plug SP is ignited. 4D, while resonating with the main capacitor C0 and the inductance on the primary side of the coil IGN and repeating the loops i3 and i2.
It decreases like a decay. Next, when the timing signal disappears, the transistor Q2 turns off and the transistor
Since the star Q1 turns ON, the RCC circuit operates again and repeats the above contents.

In the above embodiment, an example has been described in which the gate signal of the thyristor S2 is obtained from the second output winding N3 provided in the transformer T1, but other means may be used, and the converter may be used as a converter. An ON-0N type converter or the like may be used.

[0010]

As described above, according to the present invention, when charging the ignition energy to the main capacitor, the charging can be performed without being affected by the ignition coil, so that the charging efficiency can be improved and the discharge of the main capacitor can be improved. (Ignition) Since the AC arc state is obtained, there is an effect that the discharge duration time can be lengthened. As a result, the charging efficiency is good and the discharge holding time can be lengthened, so that it is possible to provide an ignition device for a motorcycle with good heat burning performance. (5)

[Brief description of the drawings]

FIG. 1 is a circuit diagram of an embodiment of the present invention.

FIG. 2 is an operation waveform diagram of each part of the present invention.

FIG. 3 is a conventional circuit diagram.

FIG. 4 is a conventional circuit diagram.

[Explanation of symbols]

 I Switching section II Main circuit III Switch circuit CON control circuit Q1 Transistor S1 Thyristor (first) S2 Thyristor (second) T1 Transformer C0 Capacitor IGN Ignition coil

Claims (3)

(57) [Claims] A main circuit for charging a capacitor with an output winding voltage of a converter and discharging a charge of the capacitor to an ignition coil via a first thyristor;
In a capacitor type ignition device provided with a control circuit for making a first thyristor conductive and stopping the operation of the converter, a second thyristor is connected in series with the capacitor, and an output winding of the converter and the second thyristor are connected. And a capacitor to form a closed circuit.
A second output winding is provided on the inverter, and the voltage of the output winding is
The capacitor type ignition device, wherein the second thyristor is made conductive . 2. The capacitor type ignition device according to claim 1, wherein a diode is connected in a polarity opposite to that of said first thyristor. Wherein the converter capacitor igniter of claims 1 1 or 2 claim of which is characterized by using one stone type ringing choke converter as.