JP2782338B2 - Trigger device - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a circuit in which a current flowing through one of two controllable switching means (for example, a thyristor or the like) having a self-holding function is transferred to the other. In the case of a configuration, the present invention relates to a trigger device capable of saving energy consumption of a trigger without hindering commutation and triggering the other without delaying the start point of turning off the other. Using this trigger device, it is possible to detect whether both are off from the on / off detection of the other. Accordingly, the field of application of the present invention is a power converter using the trigger device, and a device using the power converter, for example, an ignition device including an ignition device for an internal combustion engine, a high voltage generator, an ozonizer, and a discharge lamp. Lighting devices, induction heating devices, and the like. 2. Description of the Related Art Conventionally, in a circuit configuration in which a current flowing through one of two controllable switching means having a self-holding function is commutated to the other, the other is triggered in cooperation with one. However, it is difficult to trigger the other energy-efficiently without hindrance because the following three things must be considered. a) Since the current has a certain magnitude (current peak value in each embodiment described later) at the time of commutation, for example, in the case where the other is a thyristor having a limit of di / dt, etc. It is necessary to sufficiently trigger the thyristor to sufficiently widen the ON region in the thyristor, to secure a wide current path, and to keep the thyristor completely ON with respect to the commutation current. b) From the viewpoint of saving energy consumed by the other trigger operation, the shorter the other trigger period is, the better,
If the other trigger start time is delayed or the other trigger end time is early, the commutation is hindered (eg, commutation failure,
Generation of short-circuit current and increase of switching loss. ) Occurs. c) Considering that the period during which the load current or the like flows through one side becomes longer or shorter depending on the state of the circuit operation, so that the commutation point becomes earlier or later, the other trigger starts earlier. It is better to finish it late, but the energy consumption by the trigger operation will increase,
Even if the current flowing through the other becomes zero, the trigger delays the turn-on start time of the other. Therefore, in the case of a circuit configuration in which the current flowing through one of the two controllable switching means having a self-holding function is commutated to the other, "the commutation is not hindered, the energy consumption of the trigger is reduced, and the other is reduced. Trigger the other without delaying the start of turn-off. " (Problem) Accordingly, the present invention provides a circuit configuration in which a current flowing through one of two controllable switching means having a self-holding function is commutated to the other. It does not hinder the flow, saves the energy consumption of the trigger,
The other can be triggered without delaying the start time of the off-state ". That is, according to the present invention, there is provided a circuit in which a current flowing through a first controllable switching means having a self-holding function is diverted to a second controllable switching means having a self-holding function. In the case of a configuration, first on / off detection means for detecting on / off of the first controllable switching means and outputting a first on / off detection signal;
Triggering means that operates in accordance with an off detection signal and continues to trigger the second controllable switching means as long as the first on / off detection means detects that the first controllable switching means is on. It is a trigger device having. Accordingly, when the first controllable switching means is triggered, the second controllable switching means is also automatically triggered. In addition, even if the trigger operation for the first controllable switching means ends, as long as the first controllable switching means maintains the ON state due to a load current flowing through the first controllable switching means, the triggering operation can be performed. Means continue to automatically trigger said second controllable switching means. Thereafter, when the load current or the like flowing through the first controllable switching means is commutated to the second controllable switching means, and the first controllable switching means is turned off, the second controllable switching means is turned off. The trigger operation for the switching means stops automatically. As a result, the "time when the trigger operation for the second controllable switching means ends" is automatically optimized, and is the time when an optimal and shortest time has elapsed from the commutation time. Therefore, it is OK even if the commutation time is delayed, and the trigger device of the present invention can easily cope with the commutation delay. In addition, since the trigger period can be minimized, the energy consumed by the trigger operation can be saved.
Then, since the trigger period after the commutation is not too long, when the load current or the like flowing through the second controllable switching means becomes zero, the second controllable switching means automatically becomes It turns off and its turn-off start time is not delayed by the trigger operation. Further, since both trigger operations for the first and second controllable switching means are performed simultaneously,
No matter how early the commutation point is, the trigger operation for the second controllable switching means can be started before commutation starts. In addition to this, as described above, the “time when the trigger of the second controllable switching means ends”.
Is the "time point that is the optimal and shortest time from the commutation time point", so that the commutation time point is automatically set to "the optimal time point during the trigger period of the second controllable switching means". There is no obstacle to the flow. For this reason, "there is no problem in commutation, the energy consumption of the trigger is saved, and the second controllable switching means is turned off without delaying the second turn-off start time.
Controllable switching means can be triggered. (Effect) In the case where the present invention corresponds to the trigger device according to claim 2, the second controllable switching means is not turned off as long as the first controllable switching means is on. If ON / OFF of the second controllable switching means is detected, it can be detected whether both the first and second controllable switching means are OFF. BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be described below in more detail with reference to the accompanying drawings. The embodiment of FIG. 1 is a part of an ignition device for an internal combustion engine using a series inverter. A trigger signal and an on / off signal are input to input terminals t25 and t26, respectively. In the figure, 11 is a DC-DC converter, 45 is a discharge gap for ignition, 45 is a measure against ignition noise, and its capacity is about one hundredth of the capacity of the commutation capacitor 18. The capacitor 62, the ignition coil (step-up transformer) 71 and the ignition discharge gap 45 are shielded. The two resistors 43 and 61 (1 ohm each) are protection resistors in the event that a short circuit occurs in the power supply or the commutation capacitor 18 due to a malfunction caused by ignition noise. In the embodiment of FIG. 1, the "DC power supply formed by the DC-DC converter 11 and the power supply capacitor 36", the switching circuit 64, the thyristor 5, the commutation capacitor 18, the ignition coil 71 and the like constitute a series inverter. The "series circuit of the diode 106 and the thyristor 15" and the "series circuit of the switching circuit 64 and the diode 47" are the same as the freewheeling diode (freewheeling diode) for the primary winding of the ignition coil 71. Working circulating means limits the voltage on commutation capacitor 18 to a range between zero and the voltage on power supply capacitor 36. First, when the voltage of the commutation capacitor 18 becomes the same as the voltage of the power supply capacitor 36 during the ON period of the thyristor 5, the diode 106, which has been turned off because of the reverse voltage, is turned on. The primary current is commutated from the “series circuit of the diode 6 and the thyristor 5” to the “series circuit of the diode 106 and the thyristor 15”. The primary current is “the primary winding of the ignition coil 71, the resistor 61, the diode 106, and the thyristor 1
5, the commutation capacitor 18 maintains the voltage of the power supply capacitor 36. Next, when the voltage of the commutation capacitor 18 becomes zero during the ON period of the switching circuit 64, the diode 47 which has been turned off because of the reverse voltage is turned on. Is commutated from the commutation capacitor 18 to the diode 47. The primary current is “the primary winding of the ignition coil 71, the switching circuit 64, the resistor 43,
And the diode 47 forms a closed circuit, and the commutation capacitor 18 maintains zero voltage. In the embodiment shown in FIG. 1, each of the above-mentioned components corresponds to the following. a) The thyristors 5 and 15 serve as the first and second controllable switching means described above. b) ““ DC-DC converter 11 and power supply capacitor 3
6, a thyristor 5, a transistor 60, diodes 3, 6 and resistors 2, 80 are connected in series with a DC power source formed by a DC power source 6 and a DC power source (not shown) connected between a power line of plus v2 volts and ground. The "on / off detecting means to be formed" corresponds to the first on / off detecting means described above. c) "Trigger means formed by transistor 60 and resistors 2, 80, 81""" DC power supply (not shown) connected between power supply line of plus v2 volts and ground "" is the trigger means described above. d) "on / off detection means formed by the" DC power supply (not shown) connected between the plus v2 volt power supply line and the ground ", the thyristor 15, the transistor 37, the diodes 103 and 106, etc." The second ON
Off detection means. The current of the diode 3 is smaller than the holding current of the thyristor 5 so as not to hinder the turning off of the thyristor 5, and the current of the diode 103 is smaller than the holding current of the thyristor 15 so as not to hinder the turning off of the thyristor 15. Less than. Since the transistor 60 and the like continue to trigger the thyristor 15 as long as the thyristor 5 is on, the transistor 37 and the like can detect whether both the thyristors 5 and 15 are off from the on / off detection of the thyristor 15. Then, as long as at least one of them is on, the transistor 37 and the like prevent input of an on / off signal to the switching circuit 64. On the other hand, the transistor 38 and the like detect ON / OFF of the switching circuit 64, and the transistor 38 and the like block input of a trigger signal to the thyristor 5 (15) as long as the switching circuit 64 is ON. When the switching circuit 64 and the thyristor 5 are simultaneously turned on, the power supply capacitor 36 and the like are short-circuited when the switching circuit 64 and the thyristor 15 are simultaneously turned on, and the commutation capacitor 18 is short-circuited when the switching circuit 64 and the thyristor 15 are simultaneously turned on. It has a configuration. The embodiment of FIG. 1 is a high-voltage generator that generates a positive or negative high voltage when the ignition discharge gap 45 is removed, and the discharge lamp is turned on when a discharge lamp is connected instead of the ignition discharge gap 45. Become a device. Further, the embodiment of FIG.
Also corresponds to the trigger device according to claim 1 or 2. The embodiment of FIG. 2 is a part of an ignition device for an internal combustion engine using a series inverter, the circuit of which is partially different from that of the embodiment of FIG. The connection terminal t33 is connected to an output terminal of a positive power supply (not shown). The transistor 65 triggers the thyristor 5 by a trigger signal input to the input terminal t34, and the thyristor 15 also triggers simultaneously via the thyristor 5 and the transistor 60 and the like. On the other hand, the transistor 66 triggers the thyristor 12 by a trigger signal input to the input terminal t35, and the thyristor 12 and the transistors 70 and 68
The thyristor 22 is also triggered at the same time. The recirculation operation of the primary current, which is different from the embodiment of FIG. 1, is as follows. When the voltage of the commutation capacitor 18 becomes zero during the ON period of the thyristor 12, the ignition coil 71
Is commutated from the series circuit such as the thyristor 12 to the series circuit such as the thyristor 22. The primary current is “the primary winding of the ignition coil 71 and the thyristor 22.
Circulates through the "closed circuit formed by the circuit", and the commutation capacitor 18 maintains zero voltage. As a result, the "series circuit such as the thyristor 22" and the "series circuit of the diode 106 and the thyristor 15" together with the "commutation capacitor 1" as in the embodiment of FIG.
8 is limited to a range between zero and the voltage of the power supply capacitor 36. Since the transistor 67 prevents the transistor 66 from being turned on during the ON period of the thyristor 5 or 15, the trigger signal is prevented from being input to the thyristor 12, and furthermore, the thyristor 12 and the transistor 7 are prevented from being input.
The input of a trigger signal to the thyristor 22 via 0, 68, etc. is also prevented. On the other hand, thyristor 12 or 2
During the ON period of 2, the transistor 69 prevents the trigger signal from being input to the thyristor 5 from the transistor 65, and further prevents the trigger signal from being input to the thyristor 15 via the thyristor 5 and the transistor 60 and the like. As a result, the thyristors 12 and 5 cause “the power supply capacitor 36 and the DC-
The parallel circuit of the DC converter 11 "is short-circuited, or the thyristors 12, 15 are short-circuited to the charged commutation capacitor 18, or the thyristors 22, 5 are connected via the commutation capacitor 18 at zero voltage, for example. Short-circuiting of the power supply capacitor 36 and the like is prevented. Finally, a supplementary description will be given of the on / off detecting means which is a component of the present invention. 3 (a) to 3 (a) to 3 (c) show a basic circuit for supplying an on / off detection current to a controllable switching means (thyristor 5 or 15) for detecting on / off.
(H) shows eight. Each of the circuits shown in FIGS. 3A and 3B is a well-known on / off detecting means, and the diode 3 may be omitted. However, an unnecessary current flows from the diode 6 to the resistor 2 and the DC power supply 1 by the diode. 3 prevents. Even if a reverse voltage is applied to the one-way controllable switching means 4 or 7 by these configurations, the diode 6 accepts this reverse voltage, so that a forward voltage is always applied to the thyristor 5 by the DC power supply 1. You. Therefore, by detecting that the current flowing through each resistor 2 is cut off, the turn-off of the thyristor 5 can be known. However, the current of each resistor 2 must be smaller than the holding current of the thyristor 5 so as not to prevent the thyristor 5 from being turned off. In each of the circuits (c) and (d) of FIG.
There are two current paths through which the off detection current flows, and the current paths are switched according to the polarity of the voltage applied to the one-way controllable switching means 4 or 7. When a forward voltage is applied to the one-way controllable switching means 4 or 7, a loop (= closed circuit) including the source of the forward voltage, the thyristor 5, the resistor 2, and the DC power supply 1 is connected to the current path. On the other hand. Of course, in this case, the main current flows through the thyristor 5 and the diode 6. When a reverse voltage is applied to the one-way controllable switching means 4 or 7, the DC power supply 1,
A loop including the diode 8, the thyristor 5, and the resistor 2 is the other of the current paths. Therefore, the DC power supply 1 and the resistor 2
By detecting that the current flowing through the thyristor is cut off, the turn-off of the thyristor 5 can be known. The circuit shown in FIG. 3E is similar to the circuit shown in FIG. 3A except that a diode 9 is connected in parallel to the unidirectional controllable switching means 4 of the circuit shown in FIG. (D) are connected in series. Thyristors 5, 15 control the current in two directions. In this case, the diodes 16 and 8 and the thyristor 15 that are connected in series with their forward directions facing in the same direction are included in one arm. In some cases, a constant current element or the like needs to be inserted between the diode 3 and the resistor 2 to limit the current flowing through the diode 3. Further, the circuit of FIG. 3F is also possible. The circuit shown in FIG. 3G is one of the circuits shown in FIG.
The circuit shown in FIG. 3D and the circuit shown in FIG. 3A in which diodes are connected in series in the same direction to the directional controllable switching means 4 are connected in parallel. The circuit of FIG. 3H is also possible. The thyristors 5 and 1 are connected by the DC power supply 1.
It is necessary to set the current flowing through each of the thyristors 5 and 15 to be smaller than the respective holding current so that each current does not prevent the thyristors 5 and 15 from turning off. FIG.
In each of the circuits (a) to (h), an example in which the thyristor 5 or 15 is used as the controllable switching means has been described. Any controllable switching means may be used. Further, in each of the circuits shown in FIGS. 3A to 3H, an example is shown in which the diode 6 is used as the one-way switching means. But it is good. However, in this case, it is necessary to control the unidirectional thyristor together with the controllable switching means. [Prior Art] a) JP-B-52-50367 b) JP-B-54-503
9690c) Japanese Patent Publication No. 59-44873

BRIEF DESCRIPTION OF THE DRAWINGS FIGS. 1 and 2 are circuit diagrams each showing one embodiment of the present invention. FIG. 3 is a circuit diagram showing eight examples of a basic circuit in which an on / off detection current of an on / off detection means, which is a constituent element of the present invention, is supplied to a controllable switching means which detects on / off. [Description of Signs] 11 DC-DC converter 18 Commutation capacitor 45 Ignition discharge gap 64 Switching circuit 71 Ignition coils t25, t26, t34, t35 Input terminals 4, 7 ... Unidirectional controllable switching means

Claims (1)

(57) [Claims] In the case of a circuit configuration in which a current flowing through the first controllable switching means having a self-holding function is commutated to the second controllable switching means having a self-holding function, the first controllable switching means is turned on. , A first ON / OFF signal for detecting an OFF signal and outputting a first ON / OFF detection signal
Off detecting means, operating in accordance with the first on / off detection signal, and the second on / off detecting means detecting that the first controllable switching means is on. Trigger means comprising: trigger means for continuously triggering the control switching means. 2. 2. The trigger device according to claim 1, further comprising second on / off detection means for detecting on / off of the second controllable switching means and outputting a second on / off detection signal.