JPS60145460A - Condenser discharge type ignition device for engine - Google Patents

Abstract

PURPOSE:To feed an ignition timing control circuit with a stable, low voltage current, by connecting an input terminal of a constant voltage control circuit to a midway part of the winding of a generator coil as well as connecting its output terminal to the ignition timing control circuit. CONSTITUTION:One end of a generator coil 1 is connected to a condenser 3 and a thyristor 4 via a diode 2. A spark plug 6 is connected to the secondary side of an ignition coil 5. At a position adjacent to a grounding terminal of the generator coil 1, a lead wire is drawn out of the midway in the coil and connected to a constant voltage circuit 8 which is, in turn, connected to an ignition timing control circuit 7. With this constitution, as a power souce for the ignition timing control circuit, there is no longer requirement for another power source, and a sufficient low voltage current to be required for the circuit motion is securable.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a capacitor discharge type ignition device for an engine.

(Prior art) Some capacitor discharge type engine ignition systems using a magnetic alternator as a power source use other power sources such as batteries to operate the ignition timing control circuit. However, since the ignition device uses an external power source, assembly and wiring are complicated. For this reason, it is possible to use the electricity generated by the generator coil as a power source for the ignition timing control circuit, but as shown in Utility Model Application Publication No. 55-17968, the generator coil itself applies high voltage to the spark plug. Therefore, it is difficult to use the current voltage as a power source for the ignition timing control circuit.

(Object of the invention) This invention was made in view of the above circumstances, and it is possible to supply stable low-voltage electricity to the ignition timing control circuit while using the power generation coil 1/ without the need for a separate power source. The purpose is to provide a capacitor discharge type ignition system for an engine.

(Structure of the Invention) In order to achieve the above-mentioned object, the present invention is a capacitor discharge type empatun ignition device using a magnetic alternator as a power source, in which electricity generated in a generating coil is used as a power source for an ignition timing control circuit. in which the input end of a constant voltage control circuit provided between the generating coil and the ignition timing control circuit is connected to the middle of the winding of the generating coil,
The present invention is characterized in that the output end of this constant voltage control circuit is connected to an ignition timing control circuit.

(Example) Hereinafter, an example of the present invention will be described in detail based on the accompanying drawings.

1 and 2 show an engine ignition system according to an embodiment of the present invention, in which one end of a generating coil 1 is grounded, and the other end is connected to a capacitor 3 and a thyristor 4 via a diode 2.
It is connected to the. An ignition coil 5 for generating high voltage is connected between the capacitor 3 and ground. Furthermore, an ignition plug 6 is connected to the secondary side of the ignition coil 5 to generate a spark for engine ignition. Further, the cathode of the thyristor 4 is grounded, and the ignition timing control circuit 7 is connected to the gate. On the other hand, a lead wire is pulled out from the middle of the coil near the ground end of the generator coil 1 and connected to a constant voltage circuit 8, and the constant voltage circuit 8 is connected to the ignition timing control circuit 7.
It is connected to the.

The power generation coil 1 is separated by a lead wire, and the ground side is used as a power supply coil la, and the diode 2 side is used as a charging coil 1b.

Figure 2 shows the structure of this power generation coil 1, in which a power supply coil la is wound and a charging coil la is wound overlappingly, and the interaction of changes in magnetic flux in each coil is used. be. Furthermore, power coil l
By winding a in the lower layer, the influence of magnetic flux is increased, and the stabilization of the power supply voltage of the ignition timing control circuit 7 is accelerated.

The constant voltage circuit 8 includes a diode 9 whose anode is connected to the lead wire of the generating coil 1, a resistor 10 connected to the cathode of the diode 9, a transistor 11 whose collector is connected to the resistor 10, and the transistor 11. A resistor 12 is connected between the collector and base of the transistor 11, and a constant voltage diode 13 is connected between the base and ground of the transistor 11, and a resistor 10 and the transistor 11 are connected.
The capacitor 14 has one end connected between the collectors of the capacitor 14 and a capacitor 14 whose other end is grounded. transistor 11
The emitter of is connected to the ignition timing control circuit 7.

Ignition timing control circuit 7 includes transistor 11 of constant voltage circuit 8
Resistors 15, 16, and 17 are connected in parallel to the emitters of the transistors 15, 16, and 17, respectively, and the collector of the transistor 18 is connected through the resistor 15, the collector of the transistor 19 is connected through the resistor 16, and the collector of the transistor 20 is connected through the resistor 17. It is connected. Further, a diode 21 and a balsa coil 22 are connected between the base of the transistor 20 and the ground.
The series circuit and the resistor 23 are connected in parallel. The collector of transistor 20 is connected to the base of transistor 19, and the emitter of transistor 19 is connected to the base of transistor 18. Further, one end of a capacitor 24 is connected to the collector of the transistor 18, and a resistor 25 whose one end is grounded is connected to the other end of the capacitor 24. The gate of the thyristor 4 is connected between the capacitor 24 and the resistor 25.

Next, the operation of this embodiment will be explained.

The AC output generated in the charging coil 1h flows through a closed circuit formed by the charging coil 1h, the diode 2, the capacitor 3, the primary side of the ignition coil J115, and the power supply coil 1a, and the positive output is charged to the capacitor 3. Ru. At this time, when the iris 4 becomes conductive, the charge in the capacitor 3 is rapidly discharged, so a high voltage is induced on the secondary side of the ignition coil 5, and a spark is generated in the ignition plug 6.

On the other hand, the AC output generated in the power supply coil 1a flows into the constant voltage circuit 8, but is rectified by the diode 9 and smoothed by the capacitor 14. Then, capacitor 1
When the voltage of the transistor 4 is lower than the Zener voltage L1 of the voltage regulator diode 13, the transistor 11 has a low internal resistance value and is in a sufficiently conductive state. However, when the voltage of the capacitor 14 exceeds the Zener voltage of the voltage regulator diode 13, the voltage regulator diode becomes conductive and the emitter-base voltage changes, so the internal resistance of the transistor 11 increases. The voltage difference between the voltage and the Zener voltage is consumed as a voltage effect between the collector and the emitter.

Therefore, even if the AC output generated in the power supply coil 1a fluctuates, the ignition timing control circuit 7 can be supplied with a constant voltage DC current.

The DC current output from the constant voltage circuit 8 is connected to the resistor 15.36.
．． 17 respectively, making transistor 19 conductive, and also making transistor 18 conductive. However, transistor 20 remains non-conductive.

At this time, when an ignition signal is output from the transistor 22, the positive output of this ignition signal makes the transistor 20 conductive, which lowers the base potential of the transistor 190. 18 becomes non-conductive, and a charging current flows into the capacitor 24. Therefore, since the gate potential of the thyristor 4 increases, the thyristor 4 becomes conductive, and as described above, the charge in the capacitor 3 is discharged, causing the ignition plug 6 to generate an ignition spark.

In this embodiment, the power generation coil 1 is formed by winding the charging coil lb on top of the power supply coil la, so that by utilizing the interaction of changes in magnetic flux in each coil,
The power supply voltage can be stabilized quickly.

Next, a constant voltage circuit for an engine ignition system according to another embodiment of the present invention will be described with reference to FIGS. 3 to 6.

Elements similar to those in the embodiment described above are given the same reference numerals and explanations thereof will be omitted.

FIG. 3 shows a second embodiment, in which a resistor 26 whose one end is grounded
This is to ensure that a predetermined voltage is applied to the capacitor 14. The operation is similar to the above embodiment.

FIG. 4 shows a third embodiment, in which the anode is the power supply coil 1a.
The cathode of the thyristor 27 connected to the lead wire of the transistor 11 is connected to the collector of the transistor 11, and a diode 28 and a resistor 29 are connected in series between the anode and the gate. 30 is a transistor; transistor 30
The collector is connected between the diode 28 and the resistor 29, and the emitter is grounded via the constant voltage diode 31. Further, the base is grounded via a resistor 32 and connected to the cathode of the thyristor 27 via a resistor 33.

As a result, the AC output generated in the power supply coil la flows to the resistor 29, but since the transistor 30 is non-conductive, the base potential of the thyristor 27 is increased to make the thyristor 27 conductive. Then, the base potential of the transistor 30 increases due to the conduction of the thyristor 27, so that the base potential of the transistor 30 increases.
conducts.

Here, when the voltage of the constant voltage diode 31 is lower than the Zener voltage, the diode 31 is non-conductive, so the thyristor 27 continues to conduct, and during that time, the positive wave component of the AC output flows.

The rectified output is connected to capacitor 14. Transistor 11.
A stable voltage is maintained by a resistor 12 and a constant voltage diode 13.

FIG. 5 shows a fourth embodiment, in which a thyristor 34 has a constant voltage diode 35 connected between its anode and its gate, and a resistor 36 connected between its gate and ground. The circuit composed of the thyristor 34, the voltage regulator diode 35, and the resistor 36 operates nonlinearly, and when the potential of the positive wave of the AC output output from the power supply coil la exceeds the Zener potential of the voltage regulator diode 35, the thyristor 34 is made conductive and subsequent outputs are grounded.

FIG. 6 shows a fifth embodiment, in which a constant voltage circuit 8 according to this embodiment connects the diode 9 in the constant voltage circuit 8 according to the fourth embodiment to the anode of the thyristor 34 and the constant voltage diode 3.
The cathode of No. 5 is moved to the position where it is connected to the cathode. As a result, the voltage applied to the capacitor 14 can be controlled more accurately.

Note that this ignition timing control circuit 7 is not limited to the one described above, and may be any other known circuit.

(Effects of the Invention) As described above, the present invention provides a capacitor discharge type engine ignition system using a magnetic alternator as a power source, in which the power source for the ignition timing control circuit is obtained from the middle of the winding of the power generator. 5, so a separate power supply is required for the ignition timing control circuit.

Not only is it possible to obtain the low voltage current necessary and sufficient for the operation of this circuit, but it is also possible to simplify the circuit configuration of the constant voltage circuit provided between the generator coil and the ignition timing control circuit as much as possible. be.

[Brief explanation of the drawing]

1 and 2 are a circuit diagram of an engine ignition system according to an embodiment of the present invention, and a cross-sectional view of a power generating coil 11/in this circuit, and FIGS. 3 to 6 are a circuit diagram of an engine ignition system according to an embodiment of the present invention. FIG. 7 is a circuit diagram showing another embodiment of the voltage circuit. ]...Generating coil la...Power coil 1h...
Char? Coil for 2 2.9.21...Diode 3.14.24...Capacitor 4.27.34...Thyristor 5...Ignition coil 6...Spark plug 110, l2, i5 , 16 , 17 ,
23, 25, 26.32, 33.36...Resistance + 1. , ], 8, 19, 2 Q...Tran Zosta 1, 3, 3 +, , 35... Constant voltage diode patent applicant Mori 111 Kogyo Co., Ltd. 2 Fig. 2 1 Fig. 3

Claims (1)

[Claims] In a capacitor discharge type engine ignition device using a magnetic alternator as a power source, which uses electricity generated in a power generation coil as a power source for an ignition timing control circuit, there is a gap between the power generation coil and the ignition timing control circuit. The input end of the provided constant voltage control circuit is connected to the middle part of the winding of the generator coil, while the output end of this constant voltage control circuit is connected to the ignition timing control circuit.