JP2005307761A - Ignitor for current shutting-off type internal combustion engine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an ignitor for a current shutting-off type internal combustion engine capable of controlling current flowing through an ignition power supply coil by turning on and off by a transistor for controlling main current to perform ignition operation and preventing ignition characteristic from becoming uneven due to unevenness of current amplification rate of the transistor. <P>SOLUTION: A transistor 10 for base current side passage is connected with a base of the transistor 3 for controlling main current connected with the ignition power supply coil 1a in parallel. A transistor 11 which is turned on when a detection signal obtained at both ends of a current limit element 8 for detecting short-circuit current flowing when the transistor 3 reaches a set value and a transistor 12 which is turned on when voltage between a collector and an emitter when the transistor 3 is on reaches a set value are provided. By turning on the transistor 10 when either of the transistors 11 and 12 is on, the transistor 3 is turned off to perform ignition operation. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a current interrupting type ignition device for an internal combustion engine using a power generation coil provided on a stator of a magnet generator driven by the internal combustion engine as an ignition power supply coil.

  In a current interrupting type ignition device for an internal combustion engine that uses a power generation coil provided on a stator of a magnet generator driven by an internal combustion engine as an ignition power supply coil, a transistor is connected in parallel to both ends of the ignition power supply coil to perform ignition. In the half wave of one polarity of the output voltage of the power supply coil, by controlling the transistor to be turned on after being turned on, a high voltage is induced in the ignition power supply coil, and this voltage is further boosted and ignited. I try to get a high voltage. This type of ignition device is disclosed in Patent Document 1, for example.

  FIG. 10 shows the configuration of this type of ignition device. This ignition device includes an ignition coil IG provided in a stator of a magnet generator driven by an internal combustion engine, and a primary coil W1 of the ignition coil IG. An NPN-type main current control transistor TR1 connected in parallel with each other, base current supply resistors VR1 and R1 provided to supply a base current from the primary coil W1 of the ignition coil to the transistor TR1, and an internal combustion engine The transistor control circuit CNT controls the main current control transistor TR1 from the on state to the off state at the ignition timing of the engine.

  In this example, the primary coil W1 of the ignition coil also serves as an ignition power supply coil, and an AC voltage composed of a half-wave voltage V11 of one polarity and a half-wave voltage V12 of the other polarity is applied to the primary coil W1. Induced in synchronism with engine rotation. One end of the primary coil of the ignition coil W1 is connected to the armature core A together with one end of the secondary coil W2, and is grounded. The other end of the secondary coil W2 of the ignition coil is a spark plug PL attached to the cylinder of the engine. Connected to the non-ground terminal. The main current control transistor TR1 is connected in parallel to the primary coil W1 by connecting its collector and base to one end and the other end of the primary coil W1, respectively. One of the base current supply resistors VR1 and VR1 is a variable resistor whose resistance value can be adjusted, one end of which is connected to one end of the primary coil W1, and the other resistor R1 is variable. The resistor VR1 is connected between the other end of the resistor VR1 and the base of the transistor TR1.

  The transistor control circuit CNT includes a series circuit of a variable resistor VR2 and a fixed resistor R2, and a voltage dividing circuit VD connected in parallel between the collector and emitter of the transistor TR1, and a collector TR1 through the resistor R1. A control transistor TR2 whose emitter is connected to the other end of the primary coil W1, a diode D1 connected in parallel between the collector and emitter of the transistor TR2 with the anode facing the emitter side of the transistor TR2, The resistor R3 is connected between the base of the transistor TR2 and the voltage dividing point of the voltage dividing circuit VD, and the capacitor C1 is connected to both ends of the resistor R2 of the voltage dividing circuit.

  In the ignition device shown in FIG. 10, when the crankshaft of the engine rotates, the rotor of the magnet generator rotates, so that an AC voltage is induced in the primary coil W1. When a half-wave voltage V11 of one polarity is induced in the primary coil W1, a base current is supplied to the transistor TR1 through the variable resistor VR1 and the resistor R1, and the transistor TR1 is turned on. When the transistor TR1 is turned on, a short-circuit current flows from the primary coil W1 through the collector and emitter of the transistor TR1.

  The voltage between the collector and emitter of the transistor TR1 in the on state (the on voltage of the transistor TR1) increases as the short-circuit current of the primary coil W1 increases. The ON voltage of the transistor TR1 is detected by a voltage dividing circuit including a variable resistor VR2 and a resistor R2. When the output of the voltage dividing circuit exceeds the set value due to the rise of the ON voltage of the transistor TR1, the transistor TR2 is turned on, and the base current supplied to the transistor TR1 is bypassed from the transistor TR1, so that the transistor TR1 is turned off. As a result, the short-circuit current that has flowed through the primary coil W1 is interrupted, and thus a high voltage is induced in the primary coil W1 so as to continue to flow the short-circuit current that has been flowing so far. The voltage induced in the primary coil W1 is boosted by the turn ratio between the primary coil W1 and the secondary coil W2, and a high voltage for ignition is induced in the secondary coil W2. Since this high voltage for ignition is applied to the spark plug PL, spark discharge occurs in the spark plug.

  Therefore, the magnet generator is configured such that a half-wave voltage of one polarity is induced in the primary coil W1 at a timing before the engine ignition timing, and the transistor TR2 is turned on at a timing suitable as the engine ignition timing. By adjusting the resistance values of the variable resistors VR1 and VR2 so as to be in a state, it is possible to ignite the engine by generating a spark discharge with the spark plug PL at the ignition timing of the engine.

In the ignition device shown in FIG. 10, the collector-emitter voltage of the main current control transistor TR1 is detected by a voltage dividing circuit composed of a variable resistor VR2 and a fixed resistor R2, and the detected output reaches a predetermined value. The transistor TR2 is sometimes turned on. However, as shown in Patent Document 2, a short-circuit current that flows when the transistor TR1 is turned on is detected, and the detected value is a predetermined value. There is also known a current interruption type ignition device in which the transistor TR1 is turned off when the value reaches the value.
Japanese Patent Laid-Open No. 60-62668 Japanese Patent Laid-Open No. 10-9106

  In the conventional ignition device shown in FIG. 10, an element having a high collector-emitter voltage rated value and a large current amplification factor is used as the main current control transistor TR1, but this type of transistor has a variation in current amplification factor. Is inevitable to grow. When the current amplification factor of the transistor TR1 is small, the collector-emitter voltage (on voltage) when the transistor TR1 is on becomes high and the collector current becomes small with respect to the induced output with the ignition power supply coil. Further, when the current amplification factor is large, the on-voltage becomes low for the same induced output of the ignition power supply coil, and the collector current becomes large. Therefore, when the current gain of the transistor TR1 is small, the timing at which the transistor TR2 is turned on advances and the ignition timing advances. Further, since the current cutoff value is lowered, the peak value of the ignition high voltage induced in the secondary coil of the ignition coil is lowered. On the other hand, when the current amplification factor of the transistor TR1 is large, the ignition timing is delayed, but since the current cutoff value is high, the peak value of the ignition high voltage is high.

  Therefore, in this type of conventional ignition device, by adjusting the resistance values of the variable resistors VR1 and VR2, the on-voltage of the transistor TR1 and the timing at which the transistor TR2 is turned on are adjusted, thereby controlling the main current. Variations in ignition characteristics caused by variations in the current amplification factor of the transistor TR1 are suppressed, and adjustment work at the time of shipment is troublesome. As shown in Patent Document 2, the same problem occurs even when the timing for turning off the main current control transistor is determined by detecting the short-circuit current of the ignition power supply coil. It was.

  An object of the present invention is to provide a current interrupting type ignition device for an internal combustion engine that can suppress variations in ignition characteristics without making troublesome adjustment of circuit constants.

  In the present invention, a forward voltage is applied between a collector and an emitter when an ignition power coil that induces an alternating voltage in synchronization with rotation of an internal combustion engine and a half-wave voltage of one polarity is induced in the ignition power coil. A main current control transistor whose internal circuit between the collector and the emitter is connected in parallel to the ignition power supply coil, and from the ignition power supply coil to the transistor when a half-wave voltage of one polarity is induced in the ignition power supply coil. A base current supply resistor provided to supply a base current, a transistor control circuit for controlling the main current control transistor to be turned off at the ignition timing of the internal combustion engine, and when the transistor is turned off The present invention is directed to a current interrupting internal combustion engine ignition device including boosting means for boosting a voltage induced in an ignition power supply coil to obtain a high ignition voltage.

  In the present invention, the short-circuit current of the ignition power supply coil that flows when the main current control transistor is turned on reaches the set current value, or the collector-emitter voltage when the main current control transistor is turned on has reached the set voltage value. The transistor control circuit is configured to sometimes bypass the main current control transistor by turning off the base current of the main current control transistor from the transistor.

  With the above configuration, when the on-voltage of the main current control transistor is high and the collector current is small (when the current amplification factor of the main current control transistor is small), the on-voltage of the main current control transistor is set. When the voltage value is reached, the main current control transistor is turned off and an ignition operation is performed. When the main current control transistor has a low on-voltage and a large collector current (current amplification factor of the main current control transistor) When the collector current of the main current control transistor reaches the set current value, the main current control transistor is turned off and an ignition operation is performed. Due to the variation in rate, it is possible to prevent the ignition timing from fluctuating greatly.

  The transistor control circuit includes a short-circuit current detection means for generating a short-circuit current detection signal corresponding to a short-circuit current flowing through the ignition power supply coil and the collector emitter of the main current control transistor when the main current control transistor is on, Voltage detection means for outputting a voltage detection signal corresponding to the collector-emitter voltage of the control transistor and main current control when the short-circuit current detection signal reaches a set value or when the voltage detection signal reaches a preset reference value And a base current bypass circuit that bypasses the base current of the transistor.

  The transistor control circuit is also connected in series with the collector-emitter internal circuit of the main current control transistor and generates a short circuit current detection signal at both ends corresponding to the short circuit current that flows when the main current control transistor is turned on. A current limiting element for current detection, a resistance voltage dividing circuit for dividing the voltage across the ignition power supply coil and outputting a voltage detection signal corresponding to the collector-emitter voltage of the main current control transistor, and the short-circuit current detection signal The first control switch that is turned on when the voltage reaches the set value, the second control switch that is turned on when the voltage detection signal reaches the preset reference value, and the first control The main current control is turned on when a drive signal is given when one of the switch for operation and the second control switch is turned on. The base current of the transistor can be configured by the base current side road switch provided so as to bypass from the transistor. In this case, when the base current bypass switch is in the on state, the base current bypass switch supplies a drive signal for keeping the control switch in the on state to one of the first control switch and the second control switch. Prepare it.

  In a preferred embodiment of the present invention, a Darlington-connected composite NPN transistor is used as the main current control transistor, and its base is connected to one end of the ignition power supply coil through the base current supply resistor, and the collector is Connected to one end of the ignition power coil.

  In this case, the transistor control circuit is inserted between the emitter of the main current control transistor and the other end of the ignition power supply coil, and a short-circuit current detection signal corresponding to the short-circuit current flowing when the main current control transistor is turned on at both ends. A current limiting element for detecting the generated short circuit current, a resistance voltage dividing circuit that divides the voltage across the ignition power supply coil and outputs a voltage detection signal corresponding to the collector-emitter voltage of the main current control transistor, and an emitter A PNP-type base current side transistor connected to the base of the main current control transistor through a part of the base current supply resistor, a collector connected to the base of the base current side transistor, and an emitter an ignition power supply coil The short circuit current detection signal is applied between the base emitter and the short circuit current detection signal. An NPN-type first control transistor that is turned on when the set value is reached, a collector is connected to the base of the base current bypass transistor, an emitter is connected to the other end of the ignition power supply coil, An NPN-type second control transistor that is turned on when a voltage detection signal is applied between the base emitters and the voltage detection signal reaches a preset reference value can be configured. In this case, the collector of the base current bypass transistor is connected to the base of the first control transistor or the base of the second control transistor.

  In the present invention, when the short circuit current of the ignition power supply coil that flows when the main current control transistor is on reaches the set current value, and the collector-emitter voltage when the main current control transistor is on reaches the set voltage value The transistor control circuit may be configured so that the base current of the main current control transistor is bypassed from the transistor to turn off the main current control transistor.

  As described above, when the collector current of the main current control transistor reaches the set current value and the on-voltage reaches the set voltage value, the main current control transistor is turned off to perform the ignition operation. When the on-voltage of the main current control transistor is low and the collector current is large (when the current amplification factor of the main current control transistor is large), the phase at which the collector current of the main current control transistor reaches the set current value has advanced However, since the ignition operation is not performed until the ON voltage of the main current control transistor reaches the set voltage value, the ignition timing is prevented from being advanced when the current amplification factor of the main current control transistor is large. be able to. Also, when the on-voltage of the main current control transistor is high and the collector current is small (when the current amplification factor of the main current control transistor is small), the phase at which the on-voltage of the main current control transistor reaches the set voltage has advanced However, since the ignition operation is not performed until the collector current of the main current control transistor reaches the set current value, it is possible to prevent the ignition timing from being advanced when the current amplification factor is small. Therefore, it is possible to suppress variations in the ignition timing due to variations in the current amplification factor of the main current control transistor.

  In addition, since the current value cut off by the main current control transistor can be made constant with the above configuration, the induction of the secondary coil of the ignition coil can be performed regardless of the current amplification factor of the main current control transistor. Variations in ignition performance can be suppressed by making the voltage substantially constant.

  The transistor control circuit includes a short-circuit current detection means for generating a short-circuit current detection signal corresponding to a short-circuit current flowing through the ignition power supply coil and the main current control transistor when the main current control transistor is turned on; Voltage detection means for outputting a voltage detection signal corresponding to the collector-emitter voltage, and the base current of the main current control transistor when the short-circuit current detection signal reaches a set value and the voltage detection signal reaches a preset reference value And a base current bypass circuit that bypasses the transistor.

  The transistor control circuit is also connected in series to the collector-emitter circuit of the transistor and generates a short-circuit current detection signal corresponding to the short-circuit current that flows when the main current control transistor is turned on at both ends. When the short circuit current detection signal reaches the set value, the resistor, the resistance voltage dividing circuit that divides the voltage across the ignition power supply coil and outputs the voltage detection signal corresponding to the collector-emitter voltage of the main current control transistor A first control switch that is turned on at a time and a second control switch that is connected in series to the first control switch and that is turned on when the voltage detection signal reaches a preset reference value. When both the control switch and the first control switch and the second control switch are turned on, a drive signal is given and the control switch is turned on. The base current of Njisuta may be configured by providing a base current side road switch to bypass from the transistor.

  When an NPN type transistor is used as the main current control transistor, the transistor control circuit is also inserted between the emitter of the main current control transistor and the other end of the ignition power supply coil and flows when the main current control transistor is turned on. A current limit element for detecting a short-circuit current corresponding to the short-circuit current at both ends, and a voltage detection corresponding to the collector-emitter voltage of the main current control transistor by dividing the voltage at both ends of the ignition power supply coil A resistor voltage dividing circuit for outputting a signal; a PNP-type base current bypass transistor whose emitter is connected to the base of the main current control transistor through a part of the base current supply resistor; and an emitter of the ignition power supply coil The voltage at both ends of the current limiting element is applied between the base emitter and the base emitter. An NPN-type first control transistor that is turned on when a short-circuit current detection signal obtained at both ends of the current limiting element reaches a set value, a collector is connected to the base of the base current side transistor, and an emitter Is connected to the collector of the first control transistor, the output voltage of the resistance voltage dividing circuit is applied between the base and emitter, and the on-voltage detection signal output from the resistance voltage dividing circuit becomes a preset reference value. And an NPN-type second control transistor that is turned on when it is reached. In this case, the collector of the base current bypass transistor is connected to the base of the first control transistor.

  When an NPN transistor is used as the main current control transistor, the transistor control circuit is inserted between the emitter of the main current control transistor and the other end of the ignition power supply coil so that the main current control transistor is turned on. A current limiting element for detecting a short-circuit current at both ends that generates a short-circuit current detection signal corresponding to the flowing short-circuit current, and a voltage corresponding to the collector-emitter voltage of the main current control transistor by dividing the voltage at both ends of the ignition power supply coil A resistance voltage dividing circuit that outputs a detection signal, a PNP-type base current side transistor in which an emitter is connected to the base of the main current control transistor through a part of the base current supply resistor, and a collector that is a base current side path Connected to the base of the transistor, and a short-circuit current detection signal is applied between the base and emitter An NPN-type first control transistor that is turned on when the current detection signal reaches a set value, a collector is connected to the emitter of the first control transistor, and a voltage detection signal is connected between the base and emitter. An NPN-type second control transistor that is applied and turns on when the voltage detection signal reaches a preset reference value can also be configured. In this case, the collector of the base current bypass transistor is connected to the base of the second transistor.

  Further, regardless of whether the main current control transistor is an NPN type or a PNP type, the transistor control circuit is arranged between the ignition power supply coil and the collector emitter of the main current control transistor when the main current control transistor is turned on. A short-circuit current detection means for generating a short-circuit current detection signal corresponding to the short-circuit current flowing through the voltage, a voltage detection means for outputting a voltage detection signal corresponding to the collector-emitter voltage of the main current control transistor, and a trigger signal A self-holding switch provided to sometimes turn on and bypass the base current of the main current control transistor from the transistor, and when the short-circuit current detection signal reaches a set value or the voltage detection signal An OR circuit that provides a trigger signal to the self-holding switch when a preset reference value is reached; It can configure by providing. In this case, as the self-holding type switch, a thyristor may be used, or another switch having a self-holding function, for example, a combination of a plurality of transistors having the same function as the thyristor may be used.

  As the boosting means, an ignition coil provided on a stator of a magnet generator whose primary coil rotates synchronously with the internal combustion engine can be used. In this case, the primary coil of the ignition coil also serves as the ignition power supply coil. Further, an armature coil provided in a stator of a magnet generator that rotates in synchronization with the internal combustion engine can be used as an ignition power supply coil, and the ignition coil can be used as a boosting means.

  As described above, according to the invention described in claims 1 to 4, when the on-voltage of the main current control transistor is high and the collector current is small because the current amplification factor of the main current control transistor is small, When the on-voltage of the main current control transistor reaches the set voltage value, the main current control transistor is turned off to perform an ignition operation, and the main current control transistor has a large current amplification factor. When the on-voltage of the main transistor is low and the collector current is large, when the collector current of the main current control transistor reaches the set current value, the main current control transistor may be turned off to perform the ignition operation. Therefore, it is possible to prevent the ignition timing from fluctuating greatly due to variations in the current amplification factor of the main current control transistor.

  According to the invention described in claims 5 to 9, when the on-voltage of the main current control transistor is low and the collector current is large because the current amplification factor of the main current control transistor is large, the main current control As the phase at which the collector current of the main transistor reaches the set current value advances, the ignition timing can be prevented from being advanced, and the main current control transistor is turned on because the main current control transistor has a low current amplification factor. When the voltage is high and the collector current is small, it is possible to prevent the ignition timing from being advanced by the advance of the phase in which the on-voltage of the main current control transistor reaches the set voltage. Variations in the ignition timing due to variations in the amplification factor can be suppressed.

  According to the invention described in claims 5 to 9, since the current value cut off by the main current control transistor can be made constant, the ignition current can be increased regardless of the current amplification factor of the main current control transistor. Variations in ignition performance can be suppressed by making the induced voltage of the secondary coil of the coil substantially constant.

Hereinafter, an embodiment of the present invention will be described in detail with reference to FIGS.
FIG. 1 shows a first embodiment of the present invention. In FIG. 1, reference numeral 1 denotes an ignition coil formed by winding a primary coil 1a and a secondary coil 1b around an armature core 1c. The ignition coil 1 is provided in a stator of a magnet generator driven by an internal combustion engine, and a magnetic pole portion (not shown) provided in the iron core 1c is opposed to a magnetic pole of a rotor of the magnet generator. ing. In this example, the primary coil 1a of the ignition coil 1 also serves as an ignition power supply coil, and the primary coil 1a has an AC voltage composed of a half-wave voltage V11 of one polarity and a half-wave voltage V12 of the other polarity. Is induced in synchronization with the rotation of the engine. One end of a primary coil (hereinafter also referred to as an ignition power supply coil) 1a is connected to the iron core 1c of the ignition coil together with one end of the secondary coil 1b and grounded. The other end of the secondary coil 1b is connected to a non-grounded terminal of a spark plug 2 attached to an engine cylinder through a high voltage cord (not shown).

  Reference numeral 3 denotes a main current control transistor comprising a Darlington-connected composite NPN transistor. In this transistor, a half-wave voltage V11 of one polarity of the ignition power supply coil 1a is applied in the forward direction between the collector and emitter. In the direction, it is connected in parallel to the ignition power supply coil 1a.

  The base of the transistor 3 is connected to one end of the ignition power supply coil 1a through resistors 4 and 5 for supplying a base current. When the half-wave voltage V11 of one polarity is induced in the ignition power supply coil 1a, the base of the transistor 3 A base current is applied to the transistor 3 through the resistors 4 and 5 so that the transistor 3 is turned on. Resistors 4 and 5 constitute a base current supply circuit 6 that applies a base current to the main current control transistor 3.

  7 is a transistor control circuit for controlling the main current control transistor 3. This control circuit is used when the short circuit current of the ignition power supply coil 1a flowing when the main current control transistor 3 is turned on reaches a set current value, or When the collector-emitter voltage (referred to as on-voltage) when the control transistor 3 is on reaches a set voltage value, the base current of the main current control transistor 3 is bypassed from the transistor and the main current control transistor 3 is turned off.

  The illustrated transistor control circuit 7 is connected in series to the collector-emitter internal circuit of the main current control transistor 3 and has a short-circuit current detection signal corresponding to the short-circuit current flowing when the main current control transistor 3 is turned on at both ends. A current limiting element 8 for detecting the generated short-circuit current and a resistance voltage dividing circuit 9 for dividing a voltage across the ignition power supply coil 1a and outputting a voltage detection signal corresponding to the collector-emitter voltage of the main current control transistor 3. And a PNP-type base current side transistor 10 whose emitter is connected to the base of the main current control transistor 3 through a part 5 of the base current supply resistor, and a collector at the base of the base current side transistor 10. The emitter is connected to the other end of the ignition power supply coil 1a, and the current limiting element 8 is connected between the base and emitter. An NPN-type first control transistor 11 which is turned on when a short-circuit current detection signal obtained at the end is applied and the short-circuit current detection signal reaches a set value, and a collector which is a base current side transistor 10 And the emitter is connected to the other end of the ignition power supply coil 1a, and the voltage detection signal obtained from the resistance voltage dividing circuit 9 is applied between the base emitter and the reference value set in advance by the voltage detection signal. And an NPN-type second control transistor 12 that is turned on when the voltage reaches (1). The base current bypass transistor 10 is turned on when performing the ignition operation, and bypasses the base current supplied from the ignition power supply coil 1a to the main current control transistor 3 from the transistor 3. The collector is connected to the base of the first control transistor 11.

  More specifically, the current limiting element 8 for detecting a short-circuit current is composed of a shunt resistor 8A having a resistance value set sufficiently small so as not to affect the ignition performance. The other end of the power supply coil 1 a is connected, and the voltage at both ends is connected between the base and emitter of the first control transistor 11 through the resistor 13.

  The resistance voltage dividing circuit 9 is composed of a series circuit of resistors 9A and 9B. The resistor 9A is located on the collector side of the transistor 3 and is connected in parallel between the collector and emitter of the transistor 3. The output voltage of the resistance voltage dividing circuit 9 obtained at both ends of the resistor 9B is used as a voltage detection signal corresponding to the collector-emitter voltage of the main current control transistor 3, and the base of the second control transistor 12 is passed through the resistor 14. Applied between emitters. In the illustrated example, a diode 15 having an anode directed to the other end side of the ignition power supply coil is connected between the connection point of the resistors 4 and 5 and the other end of the ignition power supply coil 1a.

  In the illustrated example, the first control transistor 10 constitutes a first control switch that is turned on when a short-circuit current detection signal obtained at both ends of the current limiting element 8 reaches a set value. The second control transistor 12 constitutes a second control switch that is turned on when the voltage detection signal obtained from the resistance voltage divider circuit 8 reaches a preset reference value. The base current side transistor 10 is turned on by supplying a drive signal when one of the first control switch and the second control switch is turned on, thereby controlling the main current. A base current bypass switch is configured to bypass the base current of the transistor 3 from the transistor.

  The current limiting element 8 generates a short-circuit current detection means for generating a short-circuit current detection signal corresponding to a short-circuit current flowing between the ignition power supply coil 1a and the collector / emitter of the main current control transistor 3 when the main current control transistor 3 is turned on. The voltage dividing means 9 is configured to output a voltage detection signal corresponding to the collector-emitter voltage of the main current control transistor. Further, the base current bypass transistor 10, the first and second control transistors 11 and 12, and the resistors 13 and 14 cause the short-circuit current detection signal to reach the set value or the voltage detection signal is previously set. A base current bypass circuit 16 is configured to bypass the base current of the main current controlling transistor 3 from the transistor when the set reference value is reached.

  In the ignition device shown in FIG. 1, the first and second control transistors 11 and 12 are connected in parallel so as to constitute an OR circuit, and one of these transistors is turned on. A base current flows through the transistor 10 to turn on the transistor 10. When the transistor 10 is turned on, the main current control transistor 3 is turned off and an ignition operation is performed. When the short-circuit current flowing from the ignition power supply coil 1a through the transistor 3 reaches the set current value, the short-circuit current detection signal obtained at both ends of the current limiting element 8 reaches the set value, and the first control transistor 11 is turned on. The resistance value of the resistor 13 is set so as to be in a state. The voltage output from the resistance voltage dividing circuit 9 when the short-circuit current flowing through the ignition power supply coil 1a reaches a predetermined magnitude and the collector-emitter voltage (on voltage) when the transistor 3 is on reaches the set voltage value. The resistance value of the resistor 14 is set so that the detection signal reaches a preset reference value and the second control transistor 12 is turned on.

  In the ignition device shown in FIG. 1, the base and collector of the base current bypass transistor 10 are connected to the collector and base of the first control transistor 11, respectively, and the first control transistor 11 is turned on. The base current is supplied to the base current bypass transistor 10 when the transistor 10 is turned on, and the base current is supplied from the transistor 10 to the first control transistor 11 when the transistor 10 is turned on. ing. Accordingly, once the first control transistor 11 is turned on and the base current bypass transistor 10 is once turned on, the base current bypass transistor 10 has a short circuit current in the ignition power supply coil, which causes a current limit. Even if the detection signal obtained from both ends of the element 8 becomes less than the set value, the voltage is maintained in the ON state while a voltage of one polarity is induced in the ignition power supply coil.

  Further, when the second control transistor 12 is turned on before the first control transistor 11 is turned on, the base current bypass transistor 10 is turned on so that the first control transistor 11 is turned on. Since the base current is applied to the transistor for transistor 11 and the first control transistor 11 is turned on, similarly, the base current bypass transistor 10 has the ON voltage of the main current control transistor 3 set to the set voltage. Even if the detection signal obtained from the resistance voltage dividing circuit 9 becomes less than the reference value set in advance, the voltage is kept on while the voltage of one polarity is induced in the ignition power supply coil.

  In this way, after the base current bypass transistor is turned on, the main current control is achieved by keeping the transistor on while the voltage of one polarity is induced in the ignition power supply coil. It is possible to prevent the transistor for use from repeatedly turning on and off to enter an oscillation state.

A series of operations of the ignition device shown in FIG. 1 will be described as follows.
When the crankshaft of the engine rotates, an alternating voltage composed of a half-wave voltage V11 having one polarity and a half-wave voltage V12 having the other polarity is induced in the ignition power supply coil 1a. When a half-wave voltage V11 of one polarity is induced in the ignition power supply coil 1a, the base current is supplied to the main current control transistor 3 through the resistors 4 and 5, so that the transistor 3 is turned on and the ignition power supply coil 1a is turned on. Through the transistor 3 and the current limiting element 8. When this short circuit current reaches the set current value and the short circuit current detection signals obtained at both ends of the current limiting element 8 reach the set value, the transistor 11 is turned on and the base current control transistor 10 is turned on. . When the base current control transistor 10 is turned on, the base current of the main current control transistor 3 is bypassed from the transistor 3 through the PN junction between the collector and emitter of the transistor 10 and the base emitter of the transistor 11. The transistor 3 is turned off, and the short-circuit current of the ignition power supply coil that has flown up to that time is cut off. As a result, an ignition high voltage is induced in a direction in which a short-circuit current is continuously supplied to the secondary coil 1b of the ignition coil, and an ignition operation is performed.

  Further, after a half-wave voltage V11 of one polarity is induced in the ignition power supply coil 1a and the transistor 3 is turned on, the short-circuit current of the ignition power supply coil reaches a predetermined value, and the short-circuit current becomes the set current value. When the voltage between the collector and the emitter of the transistor 3 reaches the set voltage value before reaching, the detection signal output from the resistance voltage dividing circuit 9 reaches a preset reference value, so that the second control transistor 12 is turned on. And the base current bypass transistor 10 is turned on. As a result, the main current control transistor 3 is turned off, and an ignition operation is performed.

  A voltage detection signal is given from the resistance voltage dividing circuit 9 to the second control transistor 12 when a half-wave voltage V11 of one polarity is generated in the ignition power supply coil 1a. Before the control transistor 12 is turned on, the base current of the main current control transistor 3 reaches a level at which the transistor 3 is turned on, and the main control transistor 12 is turned on before the second control transistor is turned on. The circuit constants are set so that the current control transistor 3 is turned on. Accordingly, when a half-wave voltage of one polarity is induced in the ignition power supply coil 1a, the main current control transistor 3 is first turned on, and then the collector-emitter voltage of the transistor 3 reaches the set voltage value. The second control transistor 12 is turned on.

  The timing at which the short-circuit current of the ignition power supply coil reaches the set current value and the timing at which the collector-emitter voltage of the main current control transistor 3 reaches the set voltage value increase the output of the ignition power supply coil as the engine speed increases. Accordingly, the ignition timing advances to some extent as the rotational speed increases.

  As described above, in the ignition device shown in FIG. 1, even when the short circuit current of the ignition power supply coil reaches the set current value and the first control transistor 11 is turned on, the short circuit current increases. Thus, the ignition operation is also performed when the collector-emitter voltage (on voltage) of the main current control transistor 3 reaches the set voltage value and the second control transistor 12 is turned on. Accordingly, when the current amplification factor of the main current control transistor is small, the on-voltage of the main current control transistor is high and the collector current is small (the timing at which the short-circuit current reaches the set current value is delayed, but the on-voltage is When the timing at which the main current control transistor 3 reaches the set voltage value, the main current control transistor is turned off without waiting for the short circuit current to reach the set value. The ignition operation can be performed. When the main current control transistor 3 has a large current amplification factor, the main current control transistor 3 has a low ON voltage and a large collector current (the timing at which the ON voltage reaches the set voltage value is delayed, but the short circuit current is set). If the timing to reach the current value advances), the main current control transistor is turned off when the short-circuit current reaches the set current value without waiting for the ON voltage to reach the set voltage value. Can be done.

  When configured as in the embodiment shown in FIG. 1, the ignition operation is performed at an earlier timing of the timing at which the on-voltage of the main current control transistor reaches the set voltage value and the timing at which the short-circuit current reaches the set current value. Since the ON voltage set voltage value (reference value set in advance of the voltage detection signal) and the short circuit current set current value (the set value of the short circuit current detection signal) are set to appropriate values, Regardless of the current amplification factor of the main current control transistor, the ignition timing can be made almost constant. Due to variations in the current amplification factor of the main current control transistor, the ignition timing varies greatly at each rotational speed of the engine. Can be prevented.

  FIG. 2 shows the configuration of the second embodiment of the present invention. In this embodiment, the collector of the base current bypass transistor 10 is connected to the base of the second control transistor 12. The other points are configured in the same manner as the embodiment shown in FIG. The operation of the ignition device shown in FIG. 2 is performed by holding both of the second control transistor 12 and the base current bypass transistor 10 in the on state when one of them is turned on. The operation is the same as that of the embodiment of FIG. 1 except that the transistor is held in the on state.

  In each of the above embodiments, the shunt resistor 8A having a small resistance value is used as the current limiting element 8 constituting the short-circuit current detecting means for detecting the short-circuit current of the ignition power supply coil, but a diode is used as the current limiting element 8. You may make it detect a short circuit current from the forward voltage drop which arises at the both ends of this diode. FIG. 3 shows a third embodiment of the present invention. In this embodiment, the current limiting element 8 for current detection is constituted by a series circuit of two diodes 8B, and the main current controlling transistor 3 is turned on. The first control transistor 11 is turned on when the forward voltage drop (short-circuit current detection signal) generated at both ends of the series circuit of the diode 8B reaches the set value due to the short-circuit current that flows when the state is reached. It has become. In the illustrated example, a series circuit of two diodes 8B is used as the current limiting element 8, but the number of the diodes 8B is set appropriately. The other points are configured in the same manner as the embodiment shown in FIG.

  When a diode is used as the current limiting element 8 constituting the short-circuit current detecting means for detecting the short-circuit current of the ignition power supply coil as described above, the loss generated in the current limiting element can be reduced, which affects the ignition performance. Short-circuit current can be detected without giving.

  The transistor control circuit includes a short-circuit current detection means for generating a short-circuit current detection signal corresponding to a short-circuit current flowing through the ignition power supply coil and the collector emitter of the main current control transistor when the main current control transistor is on, Voltage detection means for outputting a voltage detection signal corresponding to the collector-emitter voltage of the control transistor, and is turned on when a trigger signal is applied to bypass the base current of the main current control transistor from the transistor And a self-holding switch provided to provide a trigger signal to the self-holding switch when the short-circuit current detection signal reaches a set value or when the voltage detection signal reaches a preset reference value. It can also comprise by providing a circuit.

  FIG. 4 shows a fourth embodiment of the present invention using a self-holding switch to bypass the base current of the main current control transistor. In this embodiment, the base current bypass circuit 16 is shown. Further, a thyristor 18 that is a self-holding switch is provided, and the anode of the thyristor 18 is connected to the base of the main current control transistor 3 through the resistor 5, and the cathode of the thyristor 18 is connected to the other end of the ignition power supply coil 17. Has been. A short-circuit current detection signal obtained at both ends of the current limiting element 8 and an on-voltage detection signal obtained from the resistance voltage dividing circuit 9 are applied between the gate and cathode of the thyristor 18 through the diodes 19 and 20, respectively. The other points are configured in the same manner as in the embodiment of FIG.

  In the embodiment shown in FIG. 4, the diodes 19 and 20 and the resistors 14 and 14 cause the thyristor 18 when the short-circuit current detection signal reaches a set value or when the voltage detection signal reaches a preset reference value. An OR circuit for supplying a trigger signal to is formed. In the operation of this embodiment, when the short-circuit current detection signal reaches a set value or when the voltage detection signal reaches a preset reference value, the thyristor 18 is turned on and the base current of the main current control transistor 3 is reduced. The operation is the same as that of the embodiment shown in FIG. 1 except that the transistor is bypassed.

  FIG. 5 shows a fifth embodiment of the present invention. In this embodiment, the ignition coil 1 is provided outside the magnet generator driven by the engine. Instead, an armature coil provided in the stator of the magnet generator is used as the ignition power supply coil 21. One end of the ignition power supply coil 21 is connected to the collector of the main current control transistor 3, and the other end of the ignition power supply coil 21 is connected to the emitter of the transistor 3 through the current limiting element 8. The ignition power supply coil 21 generates an alternating voltage composed of a half-wave voltage V11 having one polarity and a half-wave voltage V12 having the other polarity in synchronization with the rotation of the engine. The other points are configured in the same manner as the embodiment shown in FIG.

  In the embodiment shown in FIG. 5, the base current is applied to the main current control transistor 3 from the ignition power supply coil 21 through the resistors 4 and 5, and the transistor 3 is turned on, and the main current control transistor 1 except that the high voltage induced in the ignition power supply coil 21 is further boosted by the ignition coil 1 and the high voltage for ignition is induced in the secondary coil 1b when 3 is turned off. Perform the operation.

  FIG. 6 shows a sixth embodiment of the present invention. In this embodiment, the short-circuit current of the ignition power supply coil that flows when the main current control transistor 3 is on has reached the set current value, and the collector-emitter voltage when the main current control transistor 3 is on has reached the set voltage value. The transistor control circuit 7 is configured so that the base current of the main current control transistor 3 is sometimes bypassed from the transistor to turn off the main current control transistor 3.

  Therefore, in the illustrated example, the first control transistor 11 and the second control transistor 12 are connected in series so as to form an AND circuit. In the illustrated example, the emitter of the first control transistor 11 is connected to the other end of the ignition power supply coil 1a, the base is connected to the terminal on the transistor 3 side of the current limiting element 8 through the resistor 13, and the transistor 10 Connected to the collector. The second control transistor 12 is connected in series to the first control transistor 11 by connecting its emitter to the collector of the first control transistor 11, and the base of the second control transistor 12 is a resistor. 14 is connected to a voltage dividing point of the resistor voltage dividing circuit 9. The other points are configured in the same manner as the embodiment shown in FIG.

  In the example shown in FIG. 6, since the AND circuit is constituted by the first control transistor 11 and the second control transistor 12, the short-circuit current of the ignition power supply coil (the collector current of the main current control transistor) Reaches the set current value and the first control transistor 11 is turned on, and the on-voltage of the main current control transistor reaches the set voltage value and the second control transistor 12 is turned on. The main current control transistor 3 is turned off and an ignition operation is performed.

  With this configuration, since the current amplification factor of the main current control transistor is large, the collector current of the main current control transistor 3 is set when the on-voltage of the main current control transistor 3 is low and the collector current is large. Even if the phase of reaching the current value advances, the ignition operation is not performed until the ON voltage of the main current control transistor 3 reaches the set voltage value, so that the current amplification factor of the main current control transistor 3 is large. It is possible to prevent the ignition timing from being advanced.

  Further, since the current amplification factor of the main current control transistor is small, when the on-voltage of the main current control transistor 3 is high and the collector current is small, the phase at which the on-voltage of the main current control transistor 3 reaches the set voltage is Even if it has advanced, since the ignition operation is not performed until the collector current of the main current control transistor 3 reaches the set current value, it is possible to prevent the ignition timing from being advanced when the current amplification factor is small.

  Accordingly, by setting the set current value of the short-circuit current of the ignition power supply coil 1a and the set voltage value of the collector-emitter voltage of the main current control transistor 3 to appropriate values, the current of the main current control transistor 3 is set. Irrespective of the amplification factor, the ignition timing at each rotational speed can be made substantially constant, and variations in the ignition timing due to variations in the current amplification factor of the main current control transistor 3 can be suppressed.

  In addition, since the current value cut off by the main current control transistor 3 can be made constant when configured as shown in FIG. 6, the secondary of the ignition coil is independent of the current amplification factor of the main current control transistor 3. Variations in ignition performance can be suppressed by making the induced voltage of the coil substantially constant.

  FIG. 7 shows a seventh embodiment of the present invention. In this embodiment, the collector of the first control transistor 11 is connected to the base of the base current bypass transistor 10, and the first control transistor 11 is connected. The collector and emitter of the second control transistor 12 are connected to the emitter of the transistor 11 and the other end of the ignition power supply coil 1a, respectively. The collector of the base current bypass transistor 10 is connected to the base of the second control transistor 12. The other points are configured in the same manner as the embodiment shown in FIG. The ignition device of this embodiment is obtained by switching the positions of the first control transistor 11 and the second control transistor 12 of the embodiment of FIG. 6, and performs the same operation as that of the embodiment of FIG.

  FIG. 8 shows an eighth embodiment of the present invention. In this embodiment, the ignition coil 1 is provided outside the magnet generator driven by the engine and provided on the stator of the magnet generator. An armature coil is used as the ignition power supply coil 21. The other points are configured in the same manner as the embodiment shown in FIG.

  In the embodiment shown in FIGS. 6 to 8, a diode can be used as the current limiting element 8.

  In the embodiment shown in FIG. 4, the thyristor is used as a self-holding type switch that bypasses the base current of the main current control transistor. However, the self-holding type switch is not limited to the thyristor. As shown in FIG. 9, a switch having a function equivalent to that of a thyristor by combining a PNP transistor 10 and an NPN transistor 11 may be used.

  In each of the above embodiments, an NPN transistor is used as the main current control transistor. However, the present invention can also be applied to the case where a PNP transistor is used as the main current control transistor.

  In the embodiment shown in FIGS. 1 to 3 and the embodiment shown in FIGS. 5 to 8 respectively, the transistors 10, 11 and 13 can be replaced by other semiconductor switches such as MOSFETs.

1 is a circuit diagram showing a configuration of a first exemplary embodiment of the present invention. It is the circuit diagram which showed the structure of the 2nd Embodiment of this invention. It is the circuit diagram which showed the structure of the 3rd Embodiment of this invention. It is the circuit diagram which showed the structure of the 4th Embodiment of this invention. It is the circuit diagram which showed the structure of the 5th Embodiment of this invention. It is the circuit diagram which showed the structure of the 6th Embodiment of this invention. It is the circuit diagram which showed the structure of the 7th Embodiment of this invention. It is the circuit diagram which showed the structure of the 8th Embodiment of this invention. It is the circuit diagram which showed the structure of the 9th Embodiment of this invention. It is the circuit diagram which showed the conventional ignition device for electric current interruption type | mold internal combustion engines.

Explanation of symbols

1 Ignition coil 1a Ignition power supply coil (primary coil)
1b Secondary coil 2 Spark plug 3 Main current control transistor 4, 5 Base current supply resistor 7 Transistor control circuit 8 Current limiting element 9 Resistance voltage dividing circuit 10 Base current side transistor 11 First control transistor 12 First 2 control transistor 21 ignition power coil

Claims (12)

An ignition power supply coil that induces an AC voltage in synchronization with the rotation of the internal combustion engine, and a direction in which a forward voltage is applied between the collector and emitter when a half-wave voltage of one polarity is induced in the ignition power supply coil. A main current control transistor having a collector-emitter internal circuit connected in parallel to the ignition power supply coil, and the transistor from the ignition power supply coil when a half-wave voltage of one polarity is induced in the ignition power supply coil; A base current supply resistor provided to supply a base current to the internal combustion engine, a transistor control circuit for controlling the main current control transistor to be turned off at the ignition timing of the internal combustion engine, and the transistor being turned off. Boosting means for boosting the voltage induced in the ignition power supply coil to obtain a high voltage for ignition In fire apparatus,
The transistor control circuit includes:
When the short-circuit current of the ignition power supply coil that flows when the main current control transistor is turned on reaches a set current value, or when the collector-emitter voltage when the main current control transistor is turned on reaches a set voltage value A base current of the main current control transistor is bypassed from the transistor to turn the main current control transistor off;
An ignition device for a current interrupting internal combustion engine characterized by the above. An ignition power supply coil that induces an AC voltage in synchronization with the rotation of the internal combustion engine, and a direction in which a forward voltage is applied between the collector and emitter when a half-wave voltage of one polarity is induced in the ignition power supply coil. A main current control transistor having a collector-emitter internal circuit connected in parallel to the ignition power supply coil, and the transistor from the ignition power supply coil when a half-wave voltage of one polarity is induced in the ignition power supply coil; A base current supply resistor provided to supply a base current to the internal combustion engine, a transistor control circuit for controlling the main current control transistor to be turned off at the ignition timing of the internal combustion engine, and the transistor being turned off. Boosting means for boosting the voltage induced in the ignition power supply coil to obtain a high voltage for ignition In fire apparatus,
The transistor control circuit includes:
Short-circuit current detection means for generating a short-circuit current detection signal corresponding to a short-circuit current flowing through the ignition power supply coil and the collector-emitter of the main current control transistor when the main current control transistor is turned on;
Voltage detection means for outputting a voltage detection signal corresponding to the collector-emitter voltage of the main current control transistor;
When the short circuit current detection signal reaches a set value or when the voltage detection signal reaches a preset reference value when the main current control transistor is turned on, the base current of the main current control transistor is set to the side of the transistor. A base current bypass circuit,
An ignition device for a current interrupting internal combustion engine, comprising: An ignition power supply coil that induces an AC voltage in synchronization with the rotation of the internal combustion engine, and a direction in which a forward voltage is applied between the collector and emitter when a half-wave voltage of one polarity is induced in the ignition power supply coil. A main current control transistor having a collector-emitter internal circuit connected in parallel to the ignition power supply coil, and the transistor from the ignition power supply coil when a half-wave voltage of one polarity is induced in the ignition power supply coil; A base current supply resistor provided to supply a base current to the internal combustion engine, a transistor control circuit for controlling the main current control transistor to be turned off at the ignition timing of the internal combustion engine, and the transistor being turned off. Boosting means for boosting the voltage induced in the ignition power supply coil to obtain a high voltage for ignition In fire apparatus,
The transistor control circuit includes:
Short-circuit current detection current that is connected in series to the collector-emitter internal circuit of the main current control transistor and generates a short-circuit current detection signal at both ends corresponding to the short-circuit current that flows when the main current control transistor is turned on A limiting element;
A resistance voltage dividing circuit that divides the voltage across the ignition power supply coil and outputs a voltage detection signal corresponding to the collector-emitter voltage of the main current control transistor;
A first control switch that is turned on when the short circuit current detection signal reaches a set value; a second control switch that is turned on when the voltage detection signal reaches a preset reference value;
When one of the first control switch and the second control switch is turned on, a drive signal is applied to turn on the base current of the main current control transistor. And a base current bypass switch provided to bypass from
When the base current bypass switch is in an on state, the base current bypass switch provides a drive signal for keeping the control switch in an on state to one of the first control switch and the second control switch. Is provided,
An ignition device for a current interrupting internal combustion engine characterized by the above. An ignition power supply coil that induces an AC voltage in synchronization with the rotation of the internal combustion engine, and a direction in which a forward voltage is applied between the collector and emitter when a half-wave voltage of one polarity is induced in the ignition power supply coil. A main current control transistor having a collector-emitter internal circuit connected in parallel to the ignition power supply coil, and the transistor from the ignition power supply coil when a half-wave voltage of one polarity is induced in the ignition power supply coil; A base current supply resistor provided to supply a base current to the internal combustion engine, a transistor control circuit for controlling the main current control transistor to be turned off at the ignition timing of the internal combustion engine, and the transistor being turned off. Boosting means for boosting the voltage induced in the ignition power supply coil to obtain a high voltage for ignition In fire apparatus,
The main current control transistor is an NPN transistor, and its base is connected to one end of the ignition power supply coil through the base current supply resistor, and a collector is connected to one end of the ignition power supply coil,
The transistor control circuit is
Short-circuit current detection that is inserted between the emitter of the main current control transistor and the other end of the ignition power supply coil and generates a short-circuit current detection signal at both ends corresponding to the short-circuit current that flows when the main current control transistor is turned on Current limiting element for,
A resistance voltage dividing circuit that divides the voltage across the ignition power supply coil and outputs a voltage detection signal corresponding to the collector-emitter voltage of the main current control transistor;
A PNP-type base current bypass transistor having an emitter connected to the base of the main current control transistor through a part of the base current supply resistor;
The collector is connected to the base of the base current bypass transistor, the emitter is connected to the other end of the ignition power supply coil, the short-circuit current detection signal is applied between the base and emitter, and the short-circuit current detection signal is An NPN-type first control transistor that is turned on when the set value is reached;
The collector is connected to the base of the base current bypass transistor, the emitter is connected to the other end of the ignition power supply coil, and the voltage detection signal is applied between the base emitter and the voltage detection signal is preset. An NPN-type second control transistor that is turned on when the reference value is reached,
The collector of the base current bypass transistor is connected to the base of the first control transistor or the base of the second control transistor;
An ignition device for a current interrupting internal combustion engine characterized by the above. An ignition power supply coil that induces an AC voltage in synchronization with the rotation of the internal combustion engine, and a direction in which a forward voltage is applied between the collector and emitter when a half-wave voltage of one polarity is induced in the ignition power supply coil. A main current control transistor having a collector-emitter internal circuit connected in parallel to the ignition power supply coil, and the transistor from the ignition power supply coil when a half-wave voltage of one polarity is induced in the ignition power supply coil; A base current supply resistor provided to supply a base current to the internal combustion engine, a transistor control circuit for controlling the main current control transistor to be turned off at the ignition timing of the internal combustion engine, and the transistor being turned off. Boosting means for boosting the voltage induced in the ignition power supply coil to obtain a high ignition voltage In the device,
The transistor control circuit includes:
The main current when the short-circuit current of the ignition power supply coil that flows when the main current control transistor is on reaches a set current value, and the collector-emitter voltage when the main current control transistor is on reaches the set voltage value. A base current of the control transistor is bypassed from the transistor to turn the main current control transistor off;
An ignition device for a current interrupting internal combustion engine characterized by the above. An ignition power supply coil that induces an AC voltage in synchronization with the rotation of the internal combustion engine, and a direction in which a forward voltage is applied between the collector and emitter when a half-wave voltage of one polarity is induced in the ignition power supply coil. A main current control transistor having a collector-emitter internal circuit connected in parallel to the ignition power supply coil, and the transistor from the ignition power supply coil when a half-wave voltage of one polarity is induced in the ignition power supply coil; A base current supply resistor provided to supply a base current to the internal combustion engine, a transistor control circuit for controlling the main current control transistor to be turned off at the ignition timing of the internal combustion engine, and the transistor being turned off. Boosting means for boosting the voltage induced in the ignition power supply coil to obtain a high voltage for ignition In fire apparatus,
The transistor control circuit includes:
Short-circuit current detection means for generating a short-circuit current detection signal corresponding to a short-circuit current flowing through the ignition power supply coil and the main current control transistor when the main current control transistor is turned on;
Voltage detection means for outputting a voltage detection signal corresponding to the collector-emitter voltage of the main current control transistor;
A base current bypass circuit that bypasses the base current of the main current control transistor from the transistor when the short circuit current detection signal reaches a set value and the voltage detection signal reaches a preset reference value. That
An ignition device for a current interrupting internal combustion engine characterized by the above. An ignition power supply coil that induces an AC voltage in synchronization with the rotation of the internal combustion engine, and a direction in which a forward voltage is applied between the collector and emitter when a half-wave voltage of one polarity is induced in the ignition power supply coil. A main current control transistor having a collector-emitter internal circuit connected in parallel to the ignition power supply coil, and the transistor from the ignition power supply coil when a half-wave voltage of one polarity is induced in the ignition power supply coil; A base current supply resistor provided to supply a base current to the internal combustion engine, a transistor control circuit for controlling the main current control transistor to be turned off at the ignition timing of the internal combustion engine, and the transistor being turned off. Boosting means for boosting the voltage induced in the ignition power supply coil to obtain a high voltage for ignition In fire apparatus,
The transistor control circuit includes:
A current limiting element for detecting a short-circuit current that is connected in series to the collector-emitter circuit of the transistor and generates a short-circuit current detection signal corresponding to a short-circuit current that flows when the main current control transistor is turned on;
A resistance voltage dividing circuit that divides the voltage across the ignition power supply coil and outputs a voltage detection signal corresponding to the collector-emitter voltage of the main current control transistor;
A first control switch that is turned on when the short-circuit current detection signal reaches a set value; and a reference that is connected in series to the first control switch and the voltage detection signal is set in advance. A second control switch that is turned on when the value is reached;
When both the first control switch and the second control switch are turned on, a drive signal is applied to turn on the base current to bypass the transistor base current from the transistor A road switch,
An ignition device for a current interrupting internal combustion engine, comprising: An ignition power supply coil that induces an AC voltage in synchronization with the rotation of the internal combustion engine, and a direction in which a forward voltage is applied between the collector and emitter when a half-wave voltage of one polarity is induced in the ignition power supply coil. A main current control transistor having a collector-emitter internal circuit connected in parallel to the ignition power supply coil, and the transistor from the ignition power supply coil when a half-wave voltage of one polarity is induced in the ignition power supply coil; A base current supply resistor provided to supply a base current to the internal combustion engine, a transistor control circuit for controlling the main current control transistor to be turned off at the ignition timing of the internal combustion engine, and the transistor being turned off. Boosting means for boosting the voltage induced in the ignition power supply coil to obtain a high voltage for ignition In fire apparatus,
The main current control transistor is an NPN transistor, and its base is connected to one end of the ignition power supply coil through the base current supply resistor, and a collector is connected to one end of the ignition power supply coil,
The transistor control circuit includes:
Short-circuit current detection that is inserted between the emitter of the main current control transistor and the other end of the ignition power supply coil and generates a short-circuit current detection signal at both ends corresponding to the short-circuit current that flows when the main current control transistor is turned on Current limiting element for,
A resistance voltage dividing circuit that divides the voltage across the ignition power supply coil and outputs a voltage detection signal corresponding to the collector-emitter voltage of the main current control transistor;
A PNP-type base current bypass transistor having an emitter connected to the base of the main current control transistor through a part of the base current supply resistor;
An emitter is connected to the other end of the ignition power supply coil, and the short-circuit current detection signal is applied between the base emitters. When the short-circuit current detection signal reaches a set value, the NPN type 1 control transistor;
The collector is connected to the base of the base current bypass transistor, the emitter is connected to the collector of the first control transistor, and the voltage detection signal is applied between the base emitter and the voltage detection signal is An NPN-type second control transistor that is turned on when a preset reference value is reached,
A collector of the base current bypass transistor is connected to a base of the first control transistor;
An ignition device for a current interrupting internal combustion engine characterized by the above. An ignition power supply coil that induces an AC voltage in synchronization with the rotation of the internal combustion engine, and a direction in which a forward voltage is applied between the collector and emitter when a half-wave voltage of one polarity is induced in the ignition power supply coil. A main current control transistor having a collector-emitter internal circuit connected in parallel to the ignition power supply coil, and the transistor from the ignition power supply coil when a half-wave voltage of one polarity is induced in the ignition power supply coil; A base current supply resistor provided to supply a base current to the internal combustion engine, a transistor control circuit for controlling the main current control transistor to be turned off at the ignition timing of the internal combustion engine, and the transistor being turned off. Boosting means for boosting the voltage induced in the ignition power supply coil to obtain a high voltage for ignition In fire apparatus,
The main current control transistor is an NPN transistor, and its base is connected to one end of the ignition power supply coil through a base current detection resistor, and a collector is connected to one end of the ignition power supply coil,
The transistor control circuit includes:
Short-circuit current detection that is inserted between the emitter of the main current control transistor and the other end of the ignition power supply coil and generates a short-circuit current detection signal at both ends corresponding to the short-circuit current that flows when the main current control transistor is turned on Current limiting element for,
A resistance voltage dividing circuit that divides the voltage across the ignition power supply coil and outputs a voltage detection signal corresponding to the collector-emitter voltage of the main current control transistor;
A PNP-type base current bypass transistor having an emitter connected to the base of the main current control transistor through a part of the base current supply resistor;
A collector is connected to the base of the base current bypass transistor, the short-circuit current detection signal is applied between the base emitters, and an NPN-type first transistor that is turned on when the short-circuit current detection signal reaches a set value. 1 control transistor;
A collector is connected to the emitter of the first control transistor, and the voltage detection signal is applied between the base and emitter so that the NPN is turned on when the voltage detection signal reaches a preset reference value. A second control transistor of the form,
The collector of the base current bypass transistor is connected to the base of the second transistor;
An ignition device for a current interrupting internal combustion engine characterized by the above. An ignition power supply coil that induces an AC voltage in synchronization with the rotation of the internal combustion engine, and a direction in which a forward voltage is applied between the collector and emitter when a half-wave voltage of one polarity is induced in the ignition power supply coil. A main current control transistor having a collector-emitter internal circuit connected in parallel to the ignition power supply coil, and the transistor from the ignition power supply coil when a half-wave voltage of one polarity is induced in the ignition power supply coil; A base current supply resistor provided to supply a base current to the internal combustion engine, a transistor control circuit for controlling the main current control transistor to be turned off at the ignition timing of the internal combustion engine, and the transistor being turned off. Boosting means for boosting the voltage induced in the ignition power supply coil to obtain a high voltage for ignition In fire apparatus,
The transistor control circuit is
Short-circuit current detection means for generating a short-circuit current detection signal corresponding to a short-circuit current flowing through the ignition power supply coil and the collector-emitter of the main current control transistor when the main current control transistor is turned on;
Voltage detection means for outputting a voltage detection signal corresponding to the collector-emitter voltage of the main current control transistor;
A self-holding switch provided to turn on when the trigger signal is applied and to bypass the base current of the main current control transistor from the transistor;
An OR circuit that provides a trigger signal to the self-holding switch when the short-circuit current detection signal reaches a set value or when the voltage detection signal reaches a preset reference value;
An ignition device for a current interrupting internal combustion engine, comprising:   The boosting means comprises an ignition coil having a primary coil provided in a stator of a magnet generator that rotates synchronously with the internal combustion engine, and the primary coil of the ignition coil also serves as the ignition power supply coil. 10. The ignition device for a current interrupting internal combustion engine according to any one of 10 above. The ignition power supply coil comprises an armature coil provided on a stator of a magnet generator that rotates synchronously with the internal combustion engine,
The ignition device for a current interrupting internal combustion engine according to any one of claims 1 to 10, wherein the boosting means comprises an ignition coil.

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