JPH1052060A - Simultaneous on-duty preventive means - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent trigger from being difficult for functioning simultaneous ON-prevention, prevent holding current from increasing and from retarding to turn off, and retract it to OFF when a turn-on operation tries to start, in the case that a self-hold controllable switch means, for example, which is connected so that the short-circuit of a power source may ocenr upon turning on simultaneously with a separate controllable switch means, is turned on by means of a trigger driving and an ON-position is made to be held depending on a self-holding condition. SOLUTION: For example, in such a circuit constitution as two self-hold controllable switch means (constituted of transistors 20 to 23 and so on) short- circurts a DC power source 41, an arc-extinguishing type is used for one, and there are also provided the other on-off detecting means for detecting the other on-off signal to output the detected on-off signal, and one OFF retention means which is operated based on the detected on-off signal and maintains one in OFF condition only when the other on-off detecting means detects that the other is ON.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0010]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is intended to prevent trouble when at least one of two switching means having a self-holding function like a thyristor is simultaneously turned on (for example, these short-circuit a power supply or a resonance capacitor). When connected, the present invention relates to a simultaneous ON prevention means in which a switching means having a self-holding function is prevented from turning ON as long as the ON of a partner is detected.

[0020]

2. Description of the Related Art At least one of two switching means having a self-holding function such as a thyristor is connected so as to cause trouble if they are simultaneously turned on. If the other party turns on while the switching means having the self-holding function is off, the power supply voltage is suddenly applied to the self, so that the capacitor (self-holding) may be present. For example, a displacement current flows through a reverse-biased PN junction inside the thyristor, and the displacement current becomes a trigger current and triggers itself. As a result, both the switching means are turned on at the same time, and the power supply is short-circuited. To prevent such simultaneous ON, for example, in a thyristor, a resistor or capacitor is connected between its gate and cathode, or a resistor is equivalently formed between its gate and cathode, which is called a short-circuited emitter structure. Conventionally, the dv / dt withstand capability has been strengthened so as not to be triggered by such a displacement current.

However, a resistor or a capacitor is directly or directly connected between the two driving terminals (eg, the gate terminal and the cathode terminal of the thyristor) forming a pair for inputting the driving signal of the switching means having the self-holding function. If the dv / dt resistance is strengthened by equivalent connection to prevent the simultaneous ON as described above, there is a first problem that ordinary "triggering becomes difficult".
(1st problem)

Further, in order to enhance the dv / dt withstand capability, the simultaneous ON-prevention method in which a resistor having a small resistance value is directly or equivalently connected between the two driving terminals is called "the holding current increases". There is a problem of.
(Second problem) This is interrupted before the load current, etc. flowing between the two main terminals (eg, the anode terminal and the cathode terminal of the thyristor) decreases and does not become zero. As a result, the current waveform may be disturbed, switching loss may occur, or a surge voltage may be generated in the case of an inductive load.

Further, the third problem that the simultaneous switching-on prevention method in which a capacitor is connected between the two driving terminals to enhance the dv / dt resistance is that the turn-off of the connected switching means is delayed. There is.
(Third problem)

The fourth problem that the simultaneous ON prevention method by strengthening the dv / dt resistance is that the switching means having a self-holding function cannot be turned off if it is turned on due to malfunction. Yes.
(Fourth problem)

Therefore, according to the present invention, the trigger does not become difficult, the holding current does not increase, the turn-off does not become slow, and even if the switching means having the self-holding function is turned on due to malfunction, it is turned off. It is an object of the present invention to provide a simultaneous ON prevention means that can be pulled back to.
(Object of the invention)

[0080]

That is, the present invention relates to a case where the first switching means and the second switching means having a self-holding function and a self-extinguishing function are connected so as to cause trouble if they are simultaneously turned on. Turning on the first switching means,
First on / off detecting means for detecting an off state and outputting a first on / off detecting signal; and operating based on the first on / off detecting signal, wherein the first switching means is turned on. Simultaneous on prevention means having first off maintaining means for maintaining the second switching means in an off state as long as the first on / off detecting means detects that there is something.

As a result, as long as the first switching means is ON, the first OFF maintaining means is connected between a control terminal and a main terminal which form a pair for inputting a drive signal of the second switching means. Is short-circuited or reverse-biased to prevent the second switching means from being turned on and to be forcibly kept off, so that both the switching means can be prevented from being simultaneously turned on. (Simultaneous ON Prevention Effect) In addition, while the first switching means is off, the first off maintaining means does not prevent the second switching means from turning on, so the second switching means Does not become difficult to trigger, the holding current of the second switching means does not increase, the turn-off of the second switching means does not become slow, and the second switching means having a self-holding function malfunctions. You can turn it back off even when you turn on. (First to fourth effects)

In the case where the present invention corresponds to the simultaneous ON preventing means, as long as the second switching means is ON, the second OFF maintaining means is used for inputting a drive signal of the first switching means. The first switching means is prevented from turning on and is forcibly kept off by short-circuiting or reverse-biasing between the control terminal and the main terminal forming a pair. The action is perfect.

[0110]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in more detail with reference to the accompanying drawings. The embodiment shown in FIG. 1 corresponds to the simultaneous ON prevention means according to the first or second aspect. In the embodiment of FIG. 1, each of the above-described components corresponds to each of the above-described components. However, the above-described first on / off detection unit and the first off-maintaining unit are provided as one unit, The off detecting means and the second off maintaining means are also integrated into one means. a) Two sets of switching means having a self-holding function and a self-extinguishing function formed by transistors 20 to 23 and the like like the switching means in FIG.
For switching means. b) “Diodes 48 and 49 on the upper side of FIG. 1, lower diode 42 and transistor 54 in FIG. 1, etc.” and “diodes 48 and 49 on the lower side in FIG. 1, diode 42 and transistor 53 on the upper side in FIG. 1” have been described above. "A unit combining the first ON / OFF detection unit and the first OFF maintaining unit" and "2nd unit.
Means combining the on / off detection means and the second off maintaining means.

The two self-holding switching means formed by the transistors 20 to 23 and the like are connected so as to short-circuit the DC power supply 41. In other words, the connection is made such that a trouble is caused if they are turned on at the same time. Each trigger signal is input from an input terminal t3 and input terminals t4 and t5. As long as the self-holding switching means on the upper side of FIG. 1 is on, the transistor 54 short-circuits the base and the emitter of the transistor 20 on the lower side of FIG. 1 to turn on the self-holding switching means on the lower side of FIG. Block or force it off. On the other hand, as long as the self-holding switching means on the lower side of FIG. 1 is on, the transistor 53 short-circuits the base and the emitter of the transistor 21 on the upper side of FIG. Or force it off.

In the embodiment shown in FIG. 19, each of the components corresponds to each component described above. a) Transistor 1, like the switching means of FIG.
The two sets of switching means having a self-holding function and a self-extinguishing function formed by 2, 39, 40, etc. are the first and second sets described above.
For switching means. b) “The diodes 48 and 49 on the upper side of FIG. 19, the diode 42 on the lower side of FIG. 1, the transistors 51 and 52, and the resistor 50
Etc. "described above as" the means combining the first on / off detecting means and the first off maintaining means ". c) “The lower diodes 48 and 49 in FIG. 1, the upper diode 42, the transistors 43 and 44, and the resistor 46 in FIG.
Etc. "in the second on / off detecting means described above. d) The transistor 45 and the like serve as the second off maintaining means described above.

Each trigger signal is supplied to an input terminal t1,
It is input from the input terminal t2. Obviously, each of the OFF maintaining means of the embodiment of FIG. 1 is simpler than each of the OFF maintaining means of the embodiment of FIG. This is because the switching means of FIG. 11 is easier to turn off and forcibly keep off than the switching means of FIG. Conventional "each switching means with self-holding function and self-extinguishing function"
Are shown in FIGS. FIGS. 6 to 18 show switching means having a self-holding function and a self-extinguishing function which are easier to turn off and forcibly keep off as in the prior art.

The embodiment shown in FIG.
5 and the like and a thyristor 60 and a series inverter type ignition device circuit. In the figure, 55 is a three-terminal regulator, 56 is a DC-DC converter that outputs a negative voltage, 67 is an ignition coil, and 68 is a discharge gap for ignition. In the switching means, the transistor 61 increases the main current of the transistor 62, and the transistor 64 and the like
The base-emitter voltage of the transistor 61 helps to detect the base-emitter voltage of the transistor 61, and it is detected from the magnitude of the voltage whether the main current is larger than the holding current.
When this switching means is on, the transistor 64
Keeps transistor 63 on via transistor 65.

The main circuit is based on a DC power supply formed by a DC-DC converter 56 and a power supply capacitor 57,
It is a series inverter composed of the above-mentioned switching means, thyristor 60, commutation capacitor 71 and primary coil 67a. Then, the control method of this series inverter type ignition device is different from the conventional one. In this ignition device, when one of the above-mentioned switching means and the thyristor 60 is turned off, the other is automatically turned by this turn-off so that the timing at which the switching means and the thyristor 60 are alternately turned on is automatically optimized.・ It is turned on. That is, one turn off is the other turn off
It triggers on. (Therefore, hereinafter, such a control method will be referred to as a turn-off trigger method. Reference: Japanese Patent Application Laid-Open No. 62-5019)

For this purpose, the transistor 58 and the like detect on / off of the above-mentioned switching means, and the transistor 66 and the like detect on / off of the thyristor 60. The configuration of these on / off detecting means is basically the same as that of the embodiment of FIGS. Of course, the magnitude of each current is set smaller than its holding current value so that the current flowing through each diode 48 does not prevent the switching means and the thyristor 60 from turning off.

Here, the trigger of the thyristor 60 will be described. The usage of the pulse transformer 74 is different from the normal usage, and is a usage in which the saturation of the magnetic flux is positively used. When transistor 59 turns on, a pulse
The voltage induced on the secondary side of the transformer 74 is the thyristor 6
Although applied to the gate of zero, the magnetic flux of the pulse transformer 74 saturates immediately, so that this voltage also attenuates immediately, and the trigger of the thyristor 60 ends in a very short time. The inventor of the present invention has made the resistance so that the minute time does not affect the on-period of the thyristor 60 determined by the current of the primary coil 67a and the trigger power of the thyristor 60 is sufficient. The value of 75 and the characteristics of the pulse transformer 74 are set. As a matter of course, the excitation inductance of the pulse transformer 74 is smaller than usual. When transistor 59 turns off,
The magnetic energy of the pulse transformer 74 is consumed by the resistor 73 and the Zener diode 72, and the next trigger of the thyristor 60 is prepared.

Next, the trigger of the switching means will be described. Transistor 6 with thyristor 60
When 6 is on, current flows from this collector through resistor 76 and diode 78 to ground. Therefore, the base potential of transistor 63 is maintained at about plus 0.6 volts, and transistor 63 is prevented from turning on.
At the same time, the capacitor 77 is charged and a trigger for its switching means is prepared. When transistor 66 turns off with thyristor 60, capacitor 77
Discharges through the resistor 79, the emitter, the base, etc. of the transistor 63, so that the switching means is
Turn on.

The entire operation of the ignition device is as follows. When the switching signal and the transistor 58 are off when the ignition signal input to the input terminal t6 rises, the transistor 59 turns on and the pulse transformer 74 triggers the thyristor 60. When the thyristor 60 is turned on, since the voltage of the commutation capacitor 71 is zero, the voltage of the power supply capacitor 57 is directly applied to the primary coil 67a. As a result, 2
A high voltage is induced in the next coil 67b, and a spark is generated in the ignition discharge gap 68. After that, when the primary current becomes zero and the thyristor 60 is turned off, the transistor 66 is simultaneously turned off.
Capacitor 77 triggers the switching means described above.

When this switching means is turned on, the voltage of the commutation capacitor 71 becomes 1 in the opposite direction to the previous one.
It is applied to the next coil 67a. As a result, the secondary coil 6
A high voltage in the opposite direction is induced at 7b, and a spark is generated in the ignition discharge gap 68. During the ON period of the switching means, the transistor 58 is connected to the transistor 5
By keeping 9 off, the magnetic energy of pulse transformer 74 is released and the next trigger of thyristor 60 is prepared. Transistor 5 with its switching means
When 8 turns off, transistor 59 turns on if the ignition signal is high. The same is repeated thereafter. This repetition continues as long as the ignition signal is at a high level. However, at the time of the turn-off, if the ignition signal is low, the transistor 59 remains off and the igniter stops generating sparks.

The ignition device of the series inverter type generates a spark when charging and discharging the commutation capacitor 71. On the other hand, a well-known CDI (capacitor discharge ignition) type ignition device generates a spark only when the capacitor is discharged. Therefore, hereinafter, the former ignition method will be referred to as a capacitor charge / discharge ignition method, or simply C
CDI (Condenser Charge and
(DischargeIgnition) method or double CDI method.

The embodiment of FIG. 21 is also a circuit of a CCDI type ignition device. The control method is the aforementioned turn-off trigger method. This circuit is the thyristor 60 of FIG.
15 is a circuit using "switching means having a self-holding function and a self-extinguishing function constituted by transistors 81 to 85 and the like" shown in FIG. In the switching means, the transistor 81 or the like detects whether the main current is larger than the holding current by detecting the voltage between the base of the transistor 84 and the emitter of the transistor 85. When the main current is larger than the holding current, the transistor 81 turns on the transistor 83 via the transistor 82, and otherwise turns off.

When the switching means including the transistors 61 to 65 is on, the transistor 58 keeps not only the transistor 59 but also the transistors 83 to 85 off. Therefore, those switching means are DC-D
Short-circuiting the C converter 56 and the power supply capacitor 57 is completely prevented. When the transistor 59 is turned on, the charging current of the capacitor 80 is changed to the transistor 8
2 flows through the emitter and base of the
Switching means consisting of .about.85 etc. is triggered. Conversely, when transistor 59 turns off,
The capacitor 80 discharges and the next trigger of this switching means is ready. The operation of the entire ignition device is shown in FIG.
It is the same as that of the ignition device of 0.

The switching circuit composed of the transistors 61 to 65 and the like can be replaced with that of FIG. 10 or FIG. 20 and 21 is a high voltage generating device that generates a positive or negative high voltage if there is no ignition discharge gap 68, and a discharge lamp is connected instead of the ignition discharge gap 68. For example, it becomes a discharge lamp lighting device. If an ozone generation discharge gap is connected instead of the ignition discharge gap 68, these become ozonizers, and if an induction heating coil is connected instead of the primary coil 67a, they become an induction heating device. In addition, when spark is generated by increasing the gap length of the ignition discharge gap 68, generation of ozone is recognized.

The embodiment shown in FIG. 22 is a bridge type series inverter having a function of preventing a short circuit of the DC power supply 41 and using four switching means of FIG. Each switching means is formed by transistors 20 to 23 and the like. This main circuit is composed of a DC power supply 41, these four switching means, four rectifiers 47, a commutation reactor 86, a commutation capacitor 87, and a load resistor 88. The control method is the aforementioned turn-off trigger method.

When the start / stop signal input to input terminal t8 falls when the inverter is started, transistor 100 is turned on. And the capacitor 101
22 flows through the base and the emitter of the transistor 102, so that the transistor 102 triggers the switching means at the upper right of FIG. When this switching means is on, transistor 98 keeps the lower right switching means off in FIG.
2. Keep the lower left switching means on. For this reason,
At this time, the transistor 95 keeps the switching means in the upper left of FIG. 22 turned off, and the transistor 92 charges the capacitor 91. That is, as long as the upper right switching means is on, the transistor 93 keeps the lower left switching means on.
Can detect both ON and OFF from the ON / OFF detection of the lower left switching means.

When the upper right and lower left switching means are turned off, the discharge current of the capacitor 91 flows to the base and the emitter of the transistor 90, so that the transistors 90 and 89 trigger the upper left switching means. When its upper left switching means is on, transistor 94 keeps its lower left switching means off, while transistor 97 keeps its lower right switching means on. Therefore, at this time, the transistor 96 keeps the upper right switching means off, and the transistor 99 keeps the transistor 100 off to discharge the capacitor 101. That is, as long as the upper left switching means is on, the transistor 97 keeps the lower right switching means on, so that the transistor 99 turns on and off both from the on / off detection of the lower right switching means. Can be detected,
It is.

When the transistor 99 is turned off with its upper left and lower right switching means,
If the stop signal is low, transistor 100 turns on, and so on. This repetition continues as long as the start / stop signal is at a low level. However, at the time of the turn-off, if the start / stop signal is at a high level, the transistor 100
, The operation of this inverter stops.

The embodiment shown in FIGS. 23 and 24 is a circuit of a bridge type series inverter using four switching means shown in FIG. 11 and having a function of preventing a short circuit of the DC power supply 41. The same reference numerals are connected to the connection terminals ct1 to ct8, respectively. These switching means are switching means 107 to 110, and the circuit configuration for preventing the short circuit of the DC power supply 41 uses the embodiment of FIG. The control method of this inverter is the above-mentioned turn-off trigger method. For this purpose, the transistors 92 and 104 detect the on / off of the switching means 108 and 109, and the transistors 99 and 105 detect the switching means 1
07, 110 are detected. When the start / stop signal input to the input terminal t9 falls, or when both of the switching means 107 and 110 are turned off while this signal is at the low level, the transistors 102 and 106 are turned off. Etc. trigger the switching means 108, 109. Conversely, when neither of the switching means 108, 109 is turned on, the transistors 89, 90, 132, etc. trigger the switching means 107, 110.

The embodiment shown in FIG. 25 is a circuit of the above-mentioned ignition system of the CCDI system, and its control system is the above-mentioned turn-off trigger system. Further, the primary coil 67
There is a means in this circuit to act as a flywheel diode for a. When the switching means 112 is on, the rectifier 70 and the switching means 113 act on the primary coil 67a like a flywheel diode. Therefore, as long as the switching unit 112 is on, the transistor 114 and the like continue to trigger the switching unit 113. On the other hand, switching means 1
11 is on, the switching means 111 and the rectifier 4
9, 69 are flywheels for the primary coil 67a.
Acts like a diode. Then, the DC power supply 141
Alternatively, the transistor 66 keeps the switching means 111 off when the switching means 112 or 113 is on to prevent a short circuit of the commutation capacitor 71. When the switching means 111 is on, the transistor 94 keeps the switching means 112 off and the transistor 58 keeps the switching means 113 off.
Note that the switching means 113 is a switching means 112.
The transistor 66 and the like can detect the on / off of both the switching units 112 and 113 from the on / off detection of the switching unit 113. The whole trigger operation is the same as that of the circuit of FIG.

The embodiment shown in FIG. 26 is also the circuit of the above-mentioned CCDI type ignition device, and its control system is also the above-mentioned turn-off trigger system. Further, the primary coil 67
There is also a means in this circuit to act as a flywheel diode for a. In this circuit, unlike the circuit of FIG. 25, when the switching means 111 is on, the switching means 115 (portion surrounded by a dashed line) and the rectifier 6
9 acts on the primary coil 67a like a flywheel diode. Therefore, switching means 1
As long as 11 is on, transistor 116 continues to trigger switching means 115. In addition, the transistors 58 and 94 can detect on / off of both the switching units 111 and 115 from the on / off detection of the switching unit 115. Further, when the switching means 112 or 113 is on, the transistor 6
6, 117 keep the switching means 111, 115 off. The rest is the same as the circuit of FIG.

The embodiment shown in FIG. 27 has two sets of ignition coil 67, ignition discharge gap 68, and electronic distribution function.
It is a circuit of the above-mentioned CCDI type ignition device. This main circuit utilizes the main circuit of FIG. A spark is generated in one of the ignition discharge gaps 68 by the changeover switch 122. The main circuit is as follows. Switching means 112 charges commutation capacitor 71 via primary coil 67a, and switching means 130 charges commutation capacitor 121 via primary coil 67a. Then, the switching means 111 causes the commutation capacitor 71 or 121 to discharge through one of the primary coils 67a. Further, switching means 112 or 13
When 0 is on, the switching means 113 and the rectifier 70 or 131 act like a flywheel diode for each primary coil 67a. for that reason,
As long as the switching means 112 or 130 is on,
Transistor 114 continues to trigger switching means 113.

The embodiment shown in FIG.
And a discharge gap 68 for ignition, and a circuit of the above-described CCDI-type ignition device having an electronic power distribution function. This main circuit utilizes the main circuit of FIG. The changeover switch 122 generates a spark in one of the ignition discharge gaps 68. Switching means 118 charges commutation capacitor 71 via primary coil 67a, and switching means 119 charges commutation capacitor 121 via primary coil 67a. Then, the switching means 120 discharges the commutation capacitor 71 or 121 via one of the primary coils 67a. Switching means 1
When the transistor 20 is on, the transistor 99
Switching means 118, 1 through 28, 95, 96
Keep 19 off. At the same time, transistor 99 keeps transistor 100 off and discharges capacitor 101. On the other hand, when the switching means 118 or 119 is on, the transistor 123
The switching means 120 is kept off, and the capacitor 125 is charged at the same time. Switching means 118, 1
When both 19 are no longer on, the capacitor 12
The transistors 126 and 127 trigger the switching means 120 according to the discharge current of 5.

Lastly, in each embodiment, when the on / off state of each switching means having the self-holding function and the self-arc-extinguishing function is detected, while the switching means is on, the on / off detecting current is applied between its main terminals. However, the magnitude of the on / off detection current must be smaller than the magnitude of the holding current so as not to hinder the turn-off.

[0360]

[Related Patents] a) JP-B-55-37178 b) JP-B-56-5098 c) JP-B-56-26216 d) JP-A-62-5019 e) PCT / JP87 / 00053 (Japanese Patent Application No. 62) -500831) f) Japanese Patent Application No. 62-086800 g) Japanese Patent Application No. 62-120234

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[Procedure amendment]

[Submission date] March 12, 1997

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] Full text

[Correction method] Change

[Correction contents]

[Document Name] Statement

[Title of the Invention] Simultaneous ON prevention means

[Claims]

DETAILED DESCRIPTION OF THE INVENTION

[0010]

BACKGROUND OF THE INVENTION The present invention relates to "a plurality of controllable switching means (for example, various transistors, various thyristors, etc.) which are turned on one or in cooperation with each other", and a "self-holding function and a self-extinguishing function". If one or a plurality of controllable switching means (for example, various GTO thyristors, each controllable switching means shown in each of FIGS. 2 to 18) which are turned on in cooperation with each other are turned on at the same time, a trouble is caused. (E.g., they short-circuit the power supply or resonant capacitor), all of the latter controllable switching means are connected as long as at least one of the former controllable switching means is detected to be on. The present invention relates to a simultaneous-on prevention means for preventing turn-on. In addition, when all the former controllable switching means also have a self-holding function and a self-arc-extinguishing function, similarly, as long as it is detected that at least one of the latter controllable switching means is on, If the switching means are all turned on, the simultaneous turning on of both is completely prevented.

[0020]

2. Description of the Related Art "One or a plurality of controllable switching units which are ON-controlled in a coordinated manner" and "one or a plurality of controllable switching units which are ON-controlled in a coordinated manner having a self-holding function and a self-extinguishing function" When the "means" are connected so as to cause trouble if they are simultaneously turned on, for example, when the power supply or the resonance capacitor is short-circuited (this power supply or resonance capacitor must not be short-circuited). When "the at least one of the controllable switching means" is turned on while all of the latter controllable switching means are off, the power supply voltage or the capacitor voltage thereof becomes "at least one of the latter controllable switching means". Is rapidly applied, so that a capacitor or the like (for example, a size) existing inside the “the at least one controllable switching means”. Reverse biased PN internal static
Junction capacity of junction. ), A displacement current flows, and this displacement current becomes a trigger current to trigger and turn on the "the at least one controllable switching means". As a result, the "the turned-on controllable switching means of the former" and the "the at least one controllable switching means of the latter" are turned on at the same time, and the power supply or the resonance capacitor is short-circuited. In addition to such a malfunction, there is a malfunction caused by ignition noise (surge voltage and surge current accompanying the discharge operation). The circuit configuration for short-circuiting the resonance capacitor will be described in each embodiment described later. However, the controllable switching means for clamping for limiting the capacitor voltage between zero voltage and the power supply voltage is replaced by another controllable switching means. There is a circuit configuration that shorts the resonance capacitor when it is turned on at the same time.

To prevent such simultaneous ON, various transistors and “various thyristors having a self-extinguishing function” are used.
If the "controllable switching means having a self-extinguishing function" is controlled by ON driving or OFF driving, a control signal is always input to the controllable switching means at the time of OFF driving. Control terminal and main terminal (eg, base and emitter terminals of a bipolar transistor,
The gate terminal and the source terminal of the FET, the gate terminal and the emitter terminal of the IGBT, the cathode side gate terminal and the cathode terminal of the GTO thyristor, or the anode side gate terminal and the anode terminal. ) Can be shorted or reverse biased to force it off.

However, irrespective of the presence or absence of the self-arc-extinguishing function, when the "controllable switching means having a self-holding function" is only turned on and not turned off like a thyristor,
In other words, when turning on by a trigger drive and then relying on the self-holding state to maintain on,
It cannot be forced off as described above. This is because the on-period of the
This is because it changes depending on the situation, and it cannot be specified when it is off. Therefore, in this case, as described above, it is not possible to take a method of forcibly maintaining the switch off at all times. 』

Another method for preventing such simultaneous ON is as follows:
Between the control terminal and the main terminal that form a pair for the drive signal input of the "controllable switching means having a self-holding function", for example, reduce the value of a resistor connected between the gate and cathode of the thyristor, or In the meantime, a capacitor is connected, or a short-circuit emitter structure is called, the equivalent resistance between the gate and cathode is reduced, and the dv / dt withstand capability is strongly enhanced. This is a method in which the trigger is not caused at all by a malfunction caused by such displacement current or ignition noise.

However, such a method has the following problems. a) "It becomes difficult to perform a normal trigger. B) Connection with low resistance "increases its holding current." C) Connecting the capacitor "will slow down its turn-off." D) Due to a malfunction, it is not possible to turn it back off when it is about to turn on. The problem of item b) is that, for example, the load current flowing between the two main terminals (eg, the anode terminal and the cathode terminal of the thyristor) is cut off before the load current or the like decreases to zero. As a result, the current waveform is disturbed, switching loss occurs, a surge voltage is generated in the case of an inductive load, and the resonance capacitor is not sufficiently charged. In this way, when the "controllable switching means having a self-holding function" is only driven on and not driven off, that is, it is turned on by a trigger drive and the subsequent on-hold depends on the self-holding state, There are unique problems.

Therefore, the present invention provides a simultaneous ON preventing means which does not make it difficult to trigger, does not increase the holding current, does not delay the turn-off, and can turn it back off when the turn-on starts. It is intended to be. (Object of the invention)

[0080]

That is, the present invention relates to "one or a plurality of controllable switching means which are ON-controlled in one or cooperatively" and "one or more cooperatively controlled ON-controlled in self-holding and self-extinguishing functions." If the plurality of controllable switching means are connected so as to cause trouble if they are turned on at the same time, the former "one or more controllable switching means which are ON-controlled in cooperation" is turned on and off. The former ON / OFF detection means for detecting and outputting the former ON / OFF detection signal, and the first ON / OFF detection means operating based on the former ON / OFF detection signal; As long as the former ON / OFF detection means detects that at least one of the controllable switching means is ON, all of the latter "one or more controllable switching means which are ON-controlled in cooperation" are turned off. Maintenance A simultaneous ON prevention means having a latter off maintaining means that.

As a result, as long as at least one of the “one or a plurality of controllable switching means that are on-controlled in cooperation” is on, the latter off-maintaining means is “one or more cooperable switching means”. All controllable switching means that are controlled on
Since the ON state is prevented, when at least one of the former “one or a plurality of controllable switching means that are ON-controlled in cooperation” is ON, it is possible to prevent both of them from being simultaneously turned ON.
(Simultaneous ON prevention effect)

In addition, while all of the former "one or a plurality of controllable switching means which are turned on in cooperation" are off, the latter off maintaining means is turned on by "one or more in cooperation. Since the plurality of controllable switching means are not prevented from being triggered to turn on, none of the latter one or more controllable switching means, which are ON-controlled in cooperation, is hard to trigger. (
First effect) In addition, the holding current of any of the controllable switching means does not increase due to the cancellation of the turn-on prevention.
(Second Effect) Further, unlike the conventional method in which a capacitor is connected between a control terminal and a main terminal which form a pair for inputting a drive signal, none of the latter controllable switching means is delayed in turning off. (3rd
Effect) Then, the latter “one or a plurality of controllable switching means that are turned on in cooperation with one another” malfunctions (eg, dv / d
Malfunction caused by displacement current due to t, malfunction caused by ignition noise, etc. ) And the like, it can be turned back off by the latter off maintaining means.
(4th effect)

In the case where the present invention corresponds to the means for preventing simultaneous ON according to the second aspect, the latter "one or a plurality of controllable switching means which are ON-controlled in cooperation" is not turned on at all. When detected, the former "one or a plurality of controllable switching means which are turned on in cooperation with each other"
A voltage across at least one main terminal of at least one of the latter "one or more controllable switching means which are controlled on in conjunction", all of which have been triggered to turn on and thereby just turned off : The power supply voltage, the voltage of the resonance capacitor, etc.) are applied, but none of the latter “one or a plurality of controllable switching means that are turned on in conjunction with each other” is turned on without any trouble. (Example: short-circuit of power supply, short-circuit of resonance capacitor, etc.) Both switches on and off smoothly.

In the case where the present invention corresponds to the simultaneous on prevention means described in claim 3, as long as at least one of the latter "one or a plurality of controllable switching means which are turned on in cooperation" is on, Since the former off maintaining means forcibly keeps the former "one or a plurality of controllable switching means which are on-controlled in cooperation" off to prevent turn-on, the latter "one or more" When at least one of the plurality of controllable switching means that are turned on in cooperation with each other is on, it is possible to prevent both of them from being simultaneously turned on. As a result, the simultaneous ON prevention function is perfect. (Complete simultaneous ON prevention effect)

In the case where the present invention corresponds to the simultaneous on prevention means described in claim 4, one of the former "one or a plurality of controllable switching means which are controlled on in cooperation" is no longer on. When detected, the latter “one or a plurality of controllable switching means that are turned on in cooperation with each other”
A voltage across at least one main terminal of at least one of the former "one or more controllable controllable switching means" which has just been triggered and turned on, and thus has just been turned off. : The power supply voltage, the voltage of the resonance capacitor, etc.) are applied, but none of the former “one or a plurality of controllable switching means that are turned on in conjunction with each other” is turned on without any trouble. (Example: short-circuit of power supply, short-circuit of resonance capacitor, etc.) Both switches on and off smoothly.

In the case where the present invention corresponds to the simultaneous ON prevention means, etc., the current of "the one of the controllable switching means of the latter" is commutated to the "the other controllable switching means of the latter". It is convenient when doing. When the "one of the latter controllable switching means" is triggered, the "the other controllable switching means of the latter" is also automatically triggered, and the "one of the controllable switching means of the latter" is activated. While on, the "the latter controllable switching means of the latter" continues to trigger. Moreover, when the current is commutated and "the one of the controllable switching means of the latter" is turned off, the trigger of the "the other controllable switching means of the latter" is automatically stopped. As a result, even if the ON period of one of the latter controllable switching means changes depending on the situation, the trigger operation of the latter latter controllable switching means automatically stops at an optimal timing. Therefore, the trigger period is also optimized, so that energy consumption by the trigger can be saved, and turn-off delay due to a trigger period that is too long can be eliminated.

In the case where the present invention corresponds to the simultaneous on prevention means described in claim 7, the on / off detection of "the latter one of the controllable switching means" is determined by the "the latter controllable switching means of the latter". Therefore, the ON / OFF detection of all the controllable switching means can be performed.

In the case where the present invention corresponds to the simultaneous ON prevention means of claim 9, the current of "one of the former controllable switching means" is commutated to "the remaining controllable switching means of the former". It is convenient when doing. When the "one of the former controllable switching means" is triggered, the "the remaining controllable switching means of the former" is also automatically triggered, and the "one of the former controllable switching means" is triggered. While on, "the remaining controllable switching means of the former" continues to be triggered. Moreover, when the current is commutated and the "one of the former controllable switching means" is turned off, the trigger of the "the other controllable switching means of the former" automatically stops. As a result, even if the ON period of one of the former controllable switching means changes depending on the situation, the trigger operation of the remaining former controllable switching means automatically stops at an optimal timing. Therefore, the trigger period is also optimized, so that energy consumption by the trigger can be saved, and turn-off delay due to a trigger period that is too long can be eliminated.

In the case where the present invention corresponds to the simultaneous ON prevention means, etc., the ON / OFF detection of "one of the former controllable switching means" is determined by "the remaining controllable switching means of the former". Therefore, the ON / OFF detection of all controllable switching means can be performed.

[0180]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in more detail with reference to the accompanying drawings. The embodiment shown in FIG. 1 corresponds to the simultaneous ON prevention means described in claim 1 or 3, and the number of controllable switching means for each of the former and the latter is one. In the embodiment of FIG. 1, each corresponds to each of the above-described components as described below. However, the above-described ON / OFF detection means and the latter OFF maintaining means are one means, and the latter is described in claim 2. The on / off detecting means and the former off maintaining means in claim 3 are also integrated into one means. a) Two sets of "controllable switching means having a self-holding function and a self-extinguishing function" formed by transistors 20 to 23 and the like as in the controllable switching means in FIG. For control switching means. b) "DC power supply 41, transistors 20 to 2 in FIG.
3 and the like, the controllable switching means, the diodes 48 and 49 on the upper side of FIG. 1, the diode 42 and the transistor 54 on the lower side of FIG. 1, and the “DC power supply 41, the transistors 20 to 23 on the lower side of FIG. The controllable switching means, the diodes 48 and 49 on the lower side of FIG. 1, the diode 42 and the transistor 53 on the upper side of FIG. 1, etc. "and" the means combining the former on / off detecting means and the latter off maintaining means "and" Means combining the latter ON / OFF detection means and the former OFF maintaining means. "

The two self-holding type controllable switching means formed by the transistors 20 to 23 and the like are connected so that the DC power supply 41 is short-circuited. In other words, the connection is made such that a trouble is caused if they are turned on at the same time. Each trigger signal is input from an input terminal t3 and input terminals t4 and t5. As long as the controllable switching means on the upper side of FIG. 1 is on, the transistor 54 short-circuits the base and emitter of the transistor 20 on the lower side of FIG. 1 to prevent the controllable switching means on the lower side of FIG. 1 from turning on. Or force it off. On the other hand, as long as the controllable switching means on the lower side of FIG. 1 is on, the transistor 53 is connected to the base of the transistor 21 on the upper side of FIG.
The emitter is short-circuited to prevent the controllable switching means on the upper side of FIG. 1 from being turned on, or to forcibly keep it off. The magnitude of each current is set smaller than each holding current so that the current flowing through each diode 48 does not prevent the controllable switching means from turning off.

The embodiment shown in FIG. 19 also corresponds to the simultaneous on prevention means of claim 1 or 3, and the number of controllable switching means for each of the former and the latter is one.
In the embodiment of FIG. 19, each corresponds to each of the above-described components as follows. a) Two sets of "controllable switching means having a self-holding function and a self-extinguishing function" formed by transistors 1, 2, 39, 40, etc. as in the controllable switching means of FIG. For control switching means. b) "DC power supply 41, transistor 1 on the upper side of FIG.
Controllable switching means formed by 2, 39, 40, etc.,
The diodes 48 and 49 on the upper side in FIG. 19, the diodes 42 on the lower side in FIG. 1, the transistors 51 and 52, the resistor 50, and the like are included in the above-mentioned “unit combining the former on / off detecting unit and the latter off maintaining unit”. c) "DC power supply 41, transistor 1 on the lower side of FIG.
Controllable switching means formed by 2, 39, 40, etc.,
The diodes 48 and 49 on the lower side of FIG. 1, the diodes 42, the transistors 43 and 44, and the resistor 46 on the upper side of FIG. d) The transistor 45 or the like is the former off-holding means in claim 3.

Of course, the magnitude of each current is set smaller than each holding current so that the current flowing through each diode 48 does not prevent the controllable switching means from turning off. Each trigger signal is input from the input terminal t1 and the input terminal t2. Obviously, each of the OFF maintaining means of the embodiment of FIG. 1 is simpler than each of the OFF maintaining means of the embodiment of FIG. This is because the controllable switching means of FIG. 11 is easier to turn off and forcibly keep off than the controllable switching means of FIG. A conventional "controllable switching means having a self-holding function and a self-extinguishing function" is shown in FIGS. FIGS. 6 to 18 show controllable switching means having a self-holding function and a self-extinguishing function which are easier to turn off and forcibly keep off as in the prior art.

The embodiment shown in FIG. 20 corresponds to the simultaneous ON prevention means according to claim 1, 2 or 4, and the number of controllable switching means for each of the former and the latter is one. The embodiment of FIG. 20 is a circuit of a series inverter type ignition device using “controllable switching means of FIG. 16 composed of transistors 61 to 65 and the like” and a thyristor 60. In the drawing, 55 is a three-terminal regulator, 56 is a DC-DC converter that outputs a negative voltage, 67 is an ignition coil (step-up transformer), and 68 is a discharge gap for ignition. In the “controllable switching means formed by the transistors 61 to 65 and the like”, the transistor 61
2, the base-emitter voltage of the transistor 61 helps the transistor 64 and the like to detect the base-emitter voltage of the transistor 62, and the "voltage between the base of the transistor 62 and the emitter of the transistor 61" From the main current is larger than the holding current. When the controllable switching means is on, transistor 64 keeps transistor 63 on via transistor 65.

The main circuit is based on a DC power supply formed by a DC-DC converter 56 and a power supply capacitor 57,
Controllable switching means described above, thyristor 60, commutation capacitor (resonant capacitor) 71, and primary coil 67
a is a series inverter configured. Then, the control method of this series inverter type ignition device is different from the conventional one. In this igniter, when the controllable switching means and the thyristor 60 are turned on alternately, the timing of the turn-on of each other is automatically triggered by the opponent's turn-off so that the timing is automatically optimized. It is to be done. In other words, each other's turn-off triggers their own turn-on. Therefore, such a control method is hereinafter referred to as a turn-off trigger method. (Reference: JP-A-62-5019)

For this purpose, the transistor 58 and the like detect on / off of the controllable switching means, and the transistor 66 and the like detect on / off of the thyristor 60. The structure of these on / off detecting means is shown in FIGS.
Is basically the same as that of each embodiment. Of course, the magnitude of each current is set smaller than its respective holding current so that the current flowing through each diode 48 does not prevent the controllable switching means and the thyristor 60 from turning off.

First, the trigger operation of the thyristor 60 will be described. The usage of the pulse transformer 74 is different from the normal usage, and is a usage in which the saturation of the magnetic flux is positively used. When transistor 59 turns on, a pulse
The voltage induced on the secondary side of the transformer 74 is the thyristor 6
Although the voltage is applied to the gate of 0, since the magnetic flux of the pulse transformer 74 saturates immediately, this voltage quickly decreases, and the trigger operation of the thyristor 60 is completed in a very short time. The inventor has determined that the minute time is short enough not to affect the ON period of the thyristor 60 determined by the current of the primary coil 67a, and that the trigger power of the thyristor 60 is sufficient. The value of 75 and the characteristics of the pulse transformer 74 are set. As a matter of course, the excitation inductance of the pulse transformer 74 is smaller than usual. When the transistor 59 is turned off, the magnetic energy of the pulse transformer 74 is
Consumed by 3 and zener diode 72, the next trigger of thyristor 60 is prepared.

Next, the trigger operation of the "controllable switching means formed by the transistors 61 to 65 and the like" will be described. When the transistor 66 is on together with the thyristor 60, a resistor 76,
A current flows to the ground through the diode 78 and the like. Thus, the base potential of transistor 63 is kept at approximately plus 0.6 volts, and transistor 63 is slightly reverse biased at its base, preventing its turn on. At the same time, the capacitor 77 is charged, and the trigger operation of the controllable switching means is prepared. When transistor 66 turns off with thyristor 60, capacitor 77
Discharges through the resistor 79, the emitter, the base, etc. of the transistor 63, so that the controllable switching means is triggered and turned on.

The overall operation of the ignition device is as follows. When the ignition signal input to the input terminal t6 rises, the "controllable switching means formed by the transistors 61 to 65 and the like" and the transistor 58 are off.
Transistor 59 turns on and pulse transformer 74 triggers thyristor 60. When the thyristor 60 is first turned on, the commutation capacitor 7
Since the voltage of 1 is zero, the voltage of the power supply capacitor 57 is directly applied to the primary coil 67a. As a result, a high voltage is induced in the secondary coil 67b, and a spark is generated in the ignition discharge gap 68. After that, when the primary current becomes zero and the thyristor 60 is turned off, the transistor 66 is simultaneously turned off.
Capacitor 77 triggers and turns on the controllable switching means described above.

When the "controllable switching means formed by the transistors 61 to 65 and the like" is turned on, the voltage of the commutation capacitor 71 is reversed in the opposite direction to the primary coil 67.
a. As a result, a high voltage in the opposite direction is induced in the secondary coil 67b, and the ignition discharge gap 68
Sparks. When the ignition signal input to the input terminal t6 is at a high level when the transistor 58 is turned on together with the controllable switching means, the transistor 58 turns off the transistor 59. During the on-time of the means, the magnetic energy of the pulse transformer 74 is released and the next trigger of the thyristor 60 is prepared. Then, together with the controllable switching means, the transistor 5
When the ignition signal is high when 8 is turned off, transistor 59 turns on and pulse transformer 74 triggers thyristor 60 to turn on.

When the thyristor 60 is turned on, the sum of the voltage of the commutation capacitor 71 and the voltage of the power supply capacitor 57 is applied to the primary coil 67a. As a result, a high voltage is induced in the secondary coil 67b, and a spark is generated in the ignition discharge gap 68. Then, when the primary current becomes zero and the thyristor 60 turns off,
At the same time, transistor 66 turns off, so capacitor 77 triggers the controllable switching means described above and turns it on. Thereafter, the same operation is repeated, and the ignition device oscillates. This repetition continues as long as the ignition signal is at a high level. However, when the transistor 58 is turned off together with the "controllable switching means formed by the transistors 61 to 65 etc."
If the ignition signal is low, transistor 5
9 remains off, the oscillation and ignition operation of this ignition device are stopped, and the generation of sparks is stopped.

This series inverter type ignition device generates a spark when charging and discharging the commutation capacitor 71. On the other hand, a well-known CDI (capacitor discharge ignition) type ignition device generates a spark only when the capacitor is discharged. In the following, such an ignition method will be referred to as a capacitor charge / discharge ignition method or simply C
CDI (Condenser Charge and
(DischargeIgnition) method or double CDI method.

The embodiment shown in FIG. 20 corresponds to the simultaneous ON prevention means of the present invention. In the embodiment shown in FIG. 20, the number of controllable switching means in each of the former and the latter is one, but each corresponds to each component described above as follows. a) The thyristor 60 is the former controllable switching means. b) "Controllable switching means formed by transistors 61 to 65 etc." is the latter controllable switching means. c) "Thyristor 60, diodes 48, 49 at the bottom of the figure
And the ON / OFF detecting means constituted by the transistor 66 and the like "is the former ON / OFF detecting means. d) "" DC power supply formed by three-terminal regulator 55 and the like ", transistor 66, resistor 66 and diode 78
The off-maintaining means that is constituted by the above-mentioned off-maintaining means. e) "the controllable switching means formed by the transistors 61 to 65 and the like, and the on / off detection means constituted by the diodes 48 and 49 and the transistor 58 and the like on the upper side of the figure". For detection means. f) With the input terminal t6 connected to the plus output terminal of the three-terminal regulator 55, the "transistor 59, pulse
Transformer 74, Zener diode 72 and resistor 7
The trigger means constituted by 3, 75, etc. "is the former trigger means in claim 2. "The present inventor easily disconnects the input terminal t6 from the plus output terminal of the three-terminal regulator 55 and inputs a start / stop signal (ignition signal) from the input terminal t6 to easily start / stop means (ignition control means).
Is composed. G) "Transistor 66, capacitor 77 and resistor 79
The trigger means constituted by the above is the latter trigger means in claim 4.

Then, the thyristor 60 is triggered to turn on by the turn-off of the "controllable switching means formed by the transistors 61 to 65 and the like". Even when a power supply voltage is applied between both main terminals of the switching means, the controllable switching means never turns on. As a result, the thyristor 60 and the controllable switching means are switched on and off smoothly without any power supply short-circuit, so that the user can feel safe.

The embodiment shown in FIG.
It corresponds to the simultaneous ON prevention means described above. The embodiment of FIG. 21 is also a circuit of the ignition device of the CCDI system, and the control system is the above-mentioned turn-off trigger system. This circuit uses a "controllable switching means having a self-holding function and a self-extinguishing function constituted by transistors 81 to 85 and the like" shown in FIG. 15 instead of the thyristor 60 in FIG. The controllable switching means includes a transistor 8
1 etc. are “the base of the transistor 84 and the transistor 85
To detect whether the main current is greater than the holding current. And
When the main current is larger than the holding current, the transistor 81
Turns on the transistor 83 via the transistor 82, and otherwise turns off.

When the “controllable switching means constituted by the transistors 61 to 65 and the like” is on, the transistor 5
8 is not only transistor 59 but also transistors 83 to 8
Also keep 5 off. Therefore, it is completely prevented that the controllable switching means short-circuits the DC-DC converter 56 and the power supply capacitor 57. When the transistor 59 is turned on, the charging current of the capacitor 80 flows between the emitter and the base of the transistor 82, so that the "controllable switching means constituted by the transistors 81 to 85 and the like" is triggered. Conversely, when transistor 59 turns off, capacitor 80 discharges, preparing the next triggering of the controllable switching means. The operation of the entire ignition device is the same as that of the ignition device of FIG.

The "controllable switching circuit comprising the transistors 61 to 65 and the like" can be replaced with that of FIG. 10 or FIG. 20 and 21 is a high voltage generating device that generates a positive or negative high voltage if there is no ignition discharge gap 68, and a discharge lamp is connected instead of the ignition discharge gap 68. For example, it becomes a discharge lamp lighting device. In addition, if a discharge gap for generating ozone is connected instead of the discharge gap 68 for ignition, these become an ozonizer, and the primary coil 67
If an induction heating coil is connected instead of a, an induction heating device is obtained. In addition, when spark is generated by increasing the gap length of the ignition discharge gap 68, generation of ozone is recognized.

The embodiment shown in FIG. 22 is a bridge type series inverter having a function of preventing a short circuit of the DC power supply 41 and using four switching means of FIG. Each controllable switching means is formed by transistors 20 to 23 and the like. The main circuit is composed of a DC power supply 41, these four controllable switching means, four rectifiers 47, a commutation reactor 86, a commutation capacitor 87, and a load resistor 88. The control method is the aforementioned turn-off trigger method.

When the start / stop signal input to input terminal t8 falls when the inverter is started, transistor 100 turns on. And the capacitor 101
The transistor 102 triggers the controllable switching means at the upper right of FIG. When the controllable switching means is on, transistor 98 keeps the controllable switching means at the lower right of FIG. 22 off, while transistor 93 keeps the controllable switching means at the lower left of FIG. 22 on. Therefore, at this time, the transistor 95 is
The upper left controllable switching means is kept off, and transistor 92 charges capacitor 91. That is,
As long as the controllable switching means in the upper right is on,
Since the transistor 93 keeps the lower left controllable switching means ON, the transistor 92 can detect both ON and OFF from the ON / OFF detection of the lower left controllable switching means.

When the upper right and lower left controllable switching means are turned off, the discharge current of the capacitor 91 flows to the base and the emitter of the transistor 90, so that the transistors 90 and 89 trigger the upper left controllable switching means. When its upper left controllable switching means is on, transistor 94 keeps its lower left controllable switching means off, while transistor 97 keeps its lower right controllable switching means on. Therefore, at this time, the transistor 96 keeps the upper right controllable switching means off, and the transistor 99 keeps the transistor 100 off, so that the capacitor 101
To discharge. That is, as long as the upper left controllable switching means is on, the transistor 97 keeps the lower right controllable switching means on, so that the transistor 99 detects the on / off of the lower right controllable switching means from the on / off detection of the lower right controllable switching means. Both ON and OFF can be detected.

When the transistor 99 is turned off together with its upper left and lower right controllable switching means, if the start / stop signal is low, the transistor 1
00 turns on, the same is repeated thereafter, and the series inverter oscillates. This repetition continues as long as the start / stop signal is at a low level. However, at the time of the turn-off, if the start / stop signal is at a high level, the transistor 100 remains off and the operation of the inverter stops.

The embodiment shown in FIG. 23 and FIG. 24 is a circuit of a bridge type series inverter using four controllable switching means of FIG. 11 having a function of preventing a short circuit of the DC power supply 41. The same reference numerals are connected to the connection terminals ct1 to ct8, respectively. These controllable switching means are the controllable switching means 107 to 110, and the circuit configuration for preventing the short circuit of the DC power supply 41 uses the embodiment of FIG. The control method of this inverter is the above-mentioned turn-off trigger method. To this end, the transistors 92 and 104 are controlled by the controllable switching means 108,
The on / off state of the transistor 109 is detected, and the transistors 99, 10
5 is controllable switching means 107 and 110 are on;
Detect off. When the start / stop signal input to the input terminal t9 falls, or when the controllable switching means 107 and 110 are not turned on while this signal is at the low level, the transistor 102 , 106 etc. are controllable switching means 1
08 and 109 are triggered. Conversely, when neither controllable switching means 108, 109 is turned on, transistors 89, 90, 132, etc. trigger controllable switching means 107, 110.

The embodiment shown in FIG. 25 corresponds to the simultaneous ON prevention means according to any one of claims 1 to 7, wherein the number of the controllable switching means is one, and the number of the controllable switching means is one. The number of control switching means is two. When both controllable switching means 111 and 113 are simultaneously turned on,
A series circuit of the rectifier 70, the controllable switching means 113 and 111, and the rectifier 49 has a circuit configuration in which the commutation capacitor 71 is short-circuited. The embodiment shown in FIG. 25 is a circuit of the above-mentioned CCDI type ignition device, and its control system is the above-mentioned turn-off trigger system. Further, there is a means in this circuit to act as a flywheel diode for the primary coil 67a. Or,
There is a clamping means in this circuit for limiting the voltage of the commutation capacitor (resonant capacitor) 71 between zero voltage and the voltage of the DC power supply 141.

When the controllable switching means 112 is on, the rectifier 70 and the controllable switching means 113 act on the primary coil 67a like a flywheel diode. Therefore, the controllable switching means 11
As long as 2 is on, transistor 114 etc. will continue to trigger controllable switching means 113. On the other hand, when the controllable switching means 111 is on, the controllable switching means 111 and the rectifiers 49 and 69 are connected to the primary coil 67.
Acts like a flywheel diode on a. Alternatively, when the rectifier 69 prevents the voltage reversal of the commutation capacitor 71 and the controllable switching means 113 is turned on, the series circuit of the rectifier 103, the rectifier 70 and the controllable switching means 113 on the lower side of the figure forms the commutation capacitor 71.
Is clamped to the voltage of the DC power supply 141.

When the controllable switching means 112 or 113 is turned on to prevent the short circuit of the DC power supply 141 or the commutation capacitor 71, the transistor 66
Keeps the controllable switching means 111 off. When the controllable switching means 111 is on, the transistor 94 keeps the controllable switching means 112 off, and the transistor 58 sets the controllable switching means 11
Keep 3 off. Since the controllable switching means 113 is turned on in cooperation with the controllable switching means 112, the transistor 66 and the like turn on and off both of the controllable switching means 112 and 113 from the on / off detection of the controllable switching means 113. Off can be detected. The whole trigger operation is the same as that of the circuit of FIG.

The embodiment of FIG. 26 corresponds to the simultaneous ON prevention means according to any one of claims 1 to 10, and the number of the former and latter controllable switching means is two each. When both the controllable switching means 111 and 113 are simultaneously turned on, the rectifier 70, the controllable switching means 11
3, 111 and the rectifier 49 series circuit short-circuits the commutation capacitor 71 and the controllable switching means 112, 115.
When both are simultaneously turned on, the controllable switching means 11
5, a series circuit such as the rectifier 69 and the controllable switching means 112 has a circuit configuration in which the DC power supply 141 is directly connected to the commutation capacitor 71. This direct connection is a kind of power supply short circuit.

The embodiment shown in FIG. 26 is also the circuit of the above-mentioned ignition system of the CCDI system, and its control system is also the above-mentioned turn-off trigger system. Further, the primary coil 67
There is also a means in this circuit to act as a flywheel diode for a. In this circuit, unlike the circuit of FIG. 25, when the controllable switching means 111 is on, the controllable switching means 115 (portion surrounded by a dashed line) and the rectifier 69 connect the primary coil 67a with a flywheel diode. Works in a similar manner. Therefore, as long as the controllable switching means 111 is on, the transistor 116 continues to trigger the controllable switching means 115. Further, the transistors 58 and 94 can detect on / off of both of the controllable switching units 111 and 115 from detection of on / off of the controllable switching unit 115. Further, controllable switching means 1
When 12 or 113 is on, transistors 66, 11
7 keeps the controllable switching means 111, 115 off. The rest is the same as the circuit of FIG.

The embodiment of FIG. 27 has two sets of ignition coil 67, ignition discharge gap 68, and electronic power distribution function.
It is a circuit of the above-mentioned CCDI type ignition device. This main circuit utilizes the main circuit of FIG. A spark is generated in one of the ignition discharge gaps 68 by the changeover switch 122. The main circuit is as follows. Controllable switching means 112 charges commutation capacitor 71 via primary coil 67a, and controllable switching means 130 charges commutation capacitor 12 via primary coil 67a.
Charge 1. And controllable switching means 111
Discharges the commutation capacitor 71 or 121 via either primary coil 67a. Further, when the controllable switching means 112 or 130 is on, one
Controllable switching means 113 for the next coil 67a
And the rectifier 70 or 131 act like a flywheel diode. Therefore, as long as the controllable switching means 112 or 130 is on, the transistor 11
4 keeps triggering the controllable switching means 113.

The embodiment shown in FIG.
And a discharge gap 68 for ignition, and a circuit of the above-described CCDI-type ignition device having an electronic power distribution function. This main circuit utilizes the main circuit of FIG. The changeover switch 122 generates a spark in one of the ignition discharge gaps 68. The controllable switching means 118 charges the commutation capacitor 71 via the primary coil 67a, and the controllable switching means 119 controls the primary coil 67a.
To charge the commutation capacitor 121 via the. Then, the controllable switching means 120 is connected to one of the primary coils 6.
The commutation capacitor 71 or 121 is discharged via 7a. When the controllable switching means 120 is on, the transistor 99 keeps the controllable switching means 118, 119 off via the transistors 128, 95, 96. At the same time, transistor 99 keeps transistor 100 off and discharges capacitor 101. on the other hand,
When the controllable switching means 118 or 119 is on, the transistor 123 causes the transistor 124 to keep the controllable switching means 120 off and at the same time charges the capacitor 125. Controllable switching means 11
8 and 119 are no longer on, the transistors 126, 12
7 triggers the controllable switching means 120.

Finally, in each embodiment, when each of the "controllable switcher means having a self-holding function and a self-extinguishing function" is detected to be on or off, while it is on, it is turned on between its main terminals. -Although the off-detection current is flowing, the magnitude of the on-off detection current must be smaller than the magnitude of the holding current so as not to hinder the turn-off.

[0490]

[Related Patents] a) JP-B-55-37178 b) JP-B-56-5098 c) JP-B-56-26216 d) JP-A-62-5019 e) PCT / JP87 / 00053 (Japanese Patent Application No. 62) -500831) f) Japanese Patent Application No. 62-086800 g) Japanese Patent Application No. 62-120234

[Brief description of the drawings]

FIG. 1 is a circuit diagram showing a circuit according to one embodiment of the present invention.

FIGS. 2 to 18 are circuit diagrams each showing one example of “controllable switching means having a self-holding function and a self-extinguishing function”.

FIGS. 19 to 22 show one embodiment of the circuit of the present invention.
It is a circuit diagram shown one by one.

FIGS. 23 and 24 are circuit diagrams showing a circuit according to an embodiment of the present invention in which both figures are arranged side by side.

FIGS. 25 to 28 show one embodiment of the circuit of the present invention.
It is a circuit diagram shown one by one.

[Description of Signs] 55 3-terminal regulator 56 DC-DC converter 67 Ignition coil ct1-ct8 Connection terminal 107-113, 115 Controllable switching means 118-120, 130 Controllable Switching means

Claims (2)

[Claims] If the first switching means and the second switching means having a self-holding function and a self-extinguishing function are connected so as to cause trouble if they are simultaneously turned on,
First on / off detection means for detecting on / off of the first switching means and outputting a first on / off detection signal, and operating based on the first on / off detection signal; As long as the first on / off detecting means detects that the first switching means is on, the second
And a first off maintaining means for maintaining the switching means in an off state. 2. The second switching means having a self-holding function and a self-extinguishing function, detecting on / off of the second switching means and outputting a second on / off detection signal. Operating on the basis of the second on / off detection signal and the second on / off detection means, as long as the second on / off detection means detects that the second switching means is on. 2. The simultaneous ON prevention means according to claim 1, further comprising a second OFF maintaining means for maintaining one switching means in an OFF state.