WO1987004575A1

WO1987004575A1 - Power converter

Info

Publication number: WO1987004575A1
Application number: PCT/JP1987/000053
Authority: WO
Inventors: Toshiyasu Suzuki
Original assignee: Toshiyasu Suzuki
Priority date: 1986-01-27
Filing date: 1987-01-27
Publication date: 1987-07-30

Abstract

A power converter in which a turn-on signal input blocking means (transistor 32 or 34) blocks one of the two transistors (33, 35) from turning on so far as another transistor is on, so that the two transistors (33, 35) are prevented from simultaneously turning on to short-circuit a DC power source (13). In order to detect the turn-on or -off condition of either one of the transistors, one transistor and a rectifier are connected in series to form a one-way controllable valve. A current path is formed to flow a current into one of the transistors while it is turned on in the forward direction of the valve without passing through the rectifier. Further, the title device is provided with a current detecting means (transistor 34 or 32) to detect the current. The turn-on signal input blocking means is driven by the current detecting means.

Description

Name of Akira Itoda invention Power conversion equipment technology field This invention provides one or more controllable valves in one or more predetermined arms until one or more controllable valves are turned off. The present invention relates to a power converter in which at least one controllable valve included in another predetermined arm is controlled to be turned on and off.

Therefore, the present invention also relates to 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, a discharge lamp lighting device, an induction heating device, and the like. Background Art In a power conversion device, for example, when one of the two controllable valves is connected so that the power supply is short-circuited when the power supply is turned on at the same time, one of the controllable valves is turned off. Control may be performed so that another controllable valve is turned on.

Moreover, the on / off state of these controllable valves can be changed as soon as possible with new paper. In many cases, replacement is required.

However, when a bipolar transistor is used in its main circuit, there is a delay in turn-off due to storage time and the like, and in the case of a thyristor, there is a delay in turn-off, and in addition, there is a delay in turn-off. Since the starting point varies depending on the period during which the main current is flowing, it is especially necessary to pay attention to the aforementioned power supply short circuit.

Conventionally, technologies for preventing such short circuits have been disclosed in Japanese Patent Publication Nos. 52-503-7, 54-9690 and 59-44873. Have been.

In both technologies, in a push-pull inverter, as long as the transistor to be turned off and turned on is in the on state, this transistor receives the turn-on signal in the other transistor. A method to prevent the

However, there is a problem that the circuit configuration of the power converter that can use these technologies and the types of controllable valves are limited.

Specifically, the circuit configuration is limited to the push-al type, and the circuit configuration in which two controllable valves are connected in series is useless, and the controllable valves used are bipolar transistors and self-extinguishing valves. Is limited (it is not good for thyristors.). And even in the case of power M 0 S · FET with fast turn-off, if the power M 0 S · FET of P channel and N channel is complementarily connected. When these on / off states are switched, each piece of fresh paper These power MOS FETs that are connected in series in relation to the voltage of the power supply and the thresholds of the on and off states are temporarily turned on at the same time, and short-circuit the power supply.

(Reference: Japan International Rectifier Co., Ltd., 1985 Data, Book, HDB-3, A-80 page.)

This is well known in C-M〇S memory.

In addition, today, switching power supplies with a switching frequency of 1 megahertz are being put into practical use. · Off · Turns caused by time · Off delays cannot be ignored.

By the way, the 2SK3886 made by Toshiba Corporation has a turn-off delay time of several hundred nanoseconds.

Therefore, a technique for preventing the short-circuit of the power supply described above is desired even when the power MOSS · FET is used for the power converter.

Accordingly, it is an object of the present invention to provide a controllable valve included in one or more other predetermined arms until all of the controllable valves included in one or more predetermined arms are turned off. The first is to provide a power converter that is controlled so as not to turn on. DISCLOSURE OF THE INVENTION That is, the present invention is a power converter having the following.

New unidirectional paper with control valve S2 and unidirectional valve S3 connected in series The control valve S 1 as a constituent element is a plurality of arms, one or more arms as a controllable valve S 4 as a constituent element, and when each of the controllable valves S 2 is in an on state, Each current set to a size that does not prevent the turn-off of each of the controllable valves S2 is applied to each of the controllable valves S2 without passing through the respective one-way valve S3. Each current path flowing in the same direction as the forward direction of the controllable valve S1,

Current detection means C S 1 for detecting all the currents;

It operates according to the current detecting means CS1, and as long as the current detecting means CS1 detects that even one of the currents is flowing, it turns on each of the controllable valves S4. Turn-on signal input blocking means TII for blocking a signal from being input to each of said controllable valves S4.

that's all

(However, not all controllable valves S 2 are the same type of valve. This is also true for other valves.)

This determines whether all the one-way controllable valves S1 are in the off state for their respective forward voltages as well as for the on / off state detection through each controllable valve S2. The current detecting means CS1 can detect all of the currents of the first and second currents accurately.

As long as at least one of the controllable valves S1 is in the ON state, the turn-on signal input inhibiting means TI1 prevents any of the controllable valves S4 from turning on. Yi) た ^^ Therefore, all controllable valves S 1 change from the on state to the off state without causing a short circuit such as a power supply, and all the control valves S 1

The effect of No. 4 is that the state changes from the off state to the on state. In the case where the present invention is the power conversion device described in claim 2, the present invention operates as follows in addition to the above-described effects and effects, and has the following effects.

Whether all the one-way controllable valves S4 are in the off state with respect to the respective forward voltage is determined by all of the on / off state detection currents flowing through the respective controllable valves S5. The current detection means CS 2 can detect this accurately, and thus can be accurately known.

As long as at least one of the controllable valves S4 is in the ON state, the turn-on signal input blocking means TI2 will not turn on any of the controllable valves S1 during these turns. Prevent on.

Accordingly, the present invention has the effect that all controllable valves S4 change from the on state to the off state, and all controllable valves S1 change from the off state to the on state without causing a short circuit of the power supply or the like. It is in. As a result, for example, the on-period of all controllable valves S1 or S4 may change like a thyristor due to its load, or one of these valves may be turned on or off. However, the present invention does not cause a short circuit of a power supply or the like even if the power supply is delayed.

When there are a plurality of controllable valves S5, these are not necessarily all the same type of valves. The same is true for the one-way valve S6. New paper β

In the case where the present invention is the power converter according to claim 3, as long as the controllable valve S5a is in the ON state, all the other controllable valves S5 (including the single controllable valve) are also in the ON state. Is kept.

Therefore, it is not necessary for the current detecting means CS2 to directly detect the ON / OFF current for detecting the on / off state flowing through the controllable valve S5a.

This is because the current detection means C S2 can detect the current in an interview through another controllable valve S5.

An example of this is the embodiment of FIGS. 7 and 9 described later. In the case of a circuit configuration in which the load current flowing through the controllable valve S4 including the controllable valve S5a flows through another controllable valve S4 halfway as in these embodiments, the present invention is convenient and convenient. is there. In the case of the power converter according to claim 4 of the present invention, as long as the controllable valve S2a is in the ON state, all the other controllable valves S2 (including the single controllable valve) are also in the ON state. Is kept.

Therefore, it is not necessary for the current detecting means C S1 to directly detect the current for detecting the on / off state flowing through the controllable valve S2a.

This is because the current detecting means C S1 can indirectly detect the current through another controllable valve S2.

An example of this is the implementation of Fig. 9 described below: The present invention is convenient in the case of a circuit configuration in which the load current flowing through the controllable valve S1 including the controllable valve S2a flows through another controllable valve S1 halfway as in this embodiment. New is Figure 1 (a), (b), Fig. 3, Fig. 4 {(a), (b)}, Figs. 5 to 9 each illustrate an embodiment of the present invention. Fig. 2 is a circuit diagram showing an example circuit, and Fig. 2 (a) to (h) are circuit diagrams each showing a circuit of a part of the embodiment of the present invention. This will be described in more detail: In the following, this will be described according to the attached drawings.

First, examples of the configuration of the controllable valve S2 and its current path are shown in FIGS. 2 (a) to (h). In these figures, rectifier 16 corresponds to one-way valve S3, and thyristors 5 and 15 correspond to controllable valve S2. In FIGS. 2 (a) and (b), the loop including the DC power supply 1, the resistor 2, the diode 3, and the thyristor 5 is the current path.

The diode 3 may be omitted, but the diode 3 prevents unnecessary current from flowing from the rectifier 6 to the resistor 2 and the DC power supply 1.

With these configurations, even if a reverse voltage is applied to the unidirectional controllable valve 4 or 7, the rectifier 6 takes over the reverse voltage, so that the rectifier 5 always receives the forward voltage by the DC power supply 1. Applied. Therefore, the power flowing through the circuit including the DC power supply 1, thyristor 5, etc.

'New ^ paper S

By detecting that the current is cut off, the thyristor 5 can be turned off. ♦ However, the magnitude of this current must be smaller than its holding current so that this current does not prevent the thyristor 5 from turning off. On the other hand, in the circuits shown in FIGS. 2 (c) and 2 (d), there are two current paths, and the current paths are switched according to the polarity of the voltage applied to the controllable valve 4 or 7.

When a forward voltage is applied to the controllable valve 4 or 7, a loop including the source of the forward voltage, the thyristor 5, the resistor 2, and the DC power supply 1 is one of the current paths. Of course, in this case, the main current flows through thyristor 5 and rectifier 6.

When a reverse voltage is applied to the controllable valve 4 or 7, the loop including the direct fr power supply 1, the rectifier 8, the thyristor 5, and the resistor 2 is the other of the current paths.

Therefore, if the current flowing through the DC power supply 1 and the resistor 2 is detected to be cut off, the turn on and off of the thyristor 5 can be known.

Further, the circuit of FIG. 2 (e) is a circuit of FIG. 2 (a) and a circuit of FIG. 2 (d) in which a rectifier 9 is connected in parallel to the controllable valve 4 of FIG. 2 (a) in reverse. , Which are connected in series. Thyristors 5 and 15 control the current in two directions.

In this case, one arm includes rectifiers 16 and 8 and thyristor 15 connected in series with their forward directions facing the same direction. The same is true for rectifiers 9 and thyristor 5.

Note that a constant current element or the like is used to limit the current flowing through the diode 3.

¾1 i-one, ¾ It may be necessary to insert between diode 3 and resistor 2. The circuit shown in Fig. 2 (f) is also possible.

Then, the circuit of Fig. 2 (g) is a circuit of Fig. 2 (d) and a circuit of Fig. 2 (a) in which a rectifier is connected in series with the controllable valve 4 in Fig. 2 (d) in the same direction. The circuit shown in Fig. 2 (h) is possible.

The current flowing through each of the thyristors 5 and 15 by the DC power supply 1 is set to be smaller than the respective holding current so that each current does not hinder the turn and toughness of each of the thyristors 5 and 15. There is a need.

Also, in Fig. 2 (a-)-(-h), a thyristor 5 or 15 is used for the controllable valve S2, but the controllable valve S2 is triac, a transistor, and a power M0. Any controllable valve such as S · PET, static induction transistor, etc.

Further, FIGS. 2 (a) to 2 (h) show an example in which the rectifier 6 is used for the one-way valve S3, but the one-way valve S3 has a one-way valve if no reverse current flows. It may be a sex thyristor. However, in this case, it is necessary to control this unidirectional thyristor together with the controllable valve S2.

Next, Fig. 1 (a), (b), and Figs.

The circuit of the embodiment shown in Fig. 1 (a) is an AC-AC converter circuit in which an alternating current flows through a load resistor 19 using a series resonant circuit of a reactor 17 and a commutation capacitor 18. And a new ^ paper using the circuit shown in Fig. 2 (e). 1 〇

I have.

The same symbols are connected to the connection terminals t1 to t4, respectively. 10 is an AC power supply and 21 is a pulse transformer.

The trigger signal (turn-on signal in this case) input to the input terminal t5 causes the transistor 24 to trigger the thyristors 12 and 22 via the pulse transformer 21.

However, as long as thyristor 5 or 15 is on, transistor 23 prevents transistor 24 from turning on.

Therefore, thyristors 12 and 22 are not triggered while thyristor 5 or 15 is on. Diode 20 can be used as a measure against surge voltage. The circuit of the embodiment shown in Fig. 1 (b) is a series resonant circuit of positive and negative DC power supplies 13 and 14, thyristors 5, 12 and a reactor 17 and a commutation capacitor 18 It is a part of the series inverter formed by the above.

Transistors 30 and 31 trigger thyristor 12 according to the trigger signal (turn-on ft signal in this case) input to input 6.

The current for detecting the on / off state of the thyristor 5 flowing through the diode 28 and the resistor 29 causes a voltage drop in the two rectifiers 26 sufficient to keep the transistor 27 on. Let it.

Resistance: Turns transistor 27 on and off depending on the size of 25, etc. When the threshold current is determined and the on / off detection current is cut off, the resistor 25 immediately discharges the charge of the junction capacitance of the rectifier 26 and the transistor 27 is turned on while the thyristor 5 is on. Prevents the transistors 30 and 31 from turning on. Therefore, thyristor 12 is not triggered during this period. The circuit of the embodiment shown in FIG. 3 is a part of a series inverter using transistors 33 and 35. The transistors 33 and 35 are turned on and off by the respective turn-off signals (turn-on signals in this case) input to the input terminals t7 and t8.

However, during the ON period of the transistor 33, the transistor 34 blocks the turn-on of the transistor 35, and during the ON period of the transistor 35, the transistor 32 turns off the transistor 33. Inhibit.

Therefore, the countermeasures against the short circuit of the power supply are complete. The circuit shown in Figs. 4 (a) and (b) is a part of an ignition device (for internal combustion engine) using a series inverter. In this embodiment, a strong spark can be continuously generated as in the case of a capacitor discharge ignition type ignition device.

The same symbols are connected to the connection terminals t10 to t15, respectively. The connection terminal t9 is connected to the alas side terminal of a DC power supply (not shown). 'Tana ^ paper 1 1 is a 'DC-DC converter that outputs a negative voltage, 44 is an ignition coil, 45 is an ignition discharge gear,' / a, and 51 is a pulse transformer. The emitters of the transistors 37, 38, 49, and 50 are connected to the positive terminal of a constant voltage circuit (not shown) that outputs one plus voltage.

Each of the transistors 50 and 4 triggers each of the thyristors 5 and 12 via the pulse transformer 51 by a trigger signal input to each of the connection terminals t 10 and t 11.

However, during the ON period of the thyristor 5, the transistor 37 blocks the turn-on of the transistor 49, and during the ON period of the thyristor '12, the transistor 38 operates as a transistor ^^ 0 ^ '. Turn, block the ab. A. Therefore, thyristors 5, 12 are not triggered by each other during their opponent's on period.

Diodes 20 and 40 to 42 and resistor 39 are provided to prevent surge voltage. The two resistors 4 3 (1 ohm) are protection resistors. If both thyristors 5 and 12 are turned on at the same time due to a malfunction caused by ignition noise, these resistors 4 3 Protect thyristors 5 and 12. The ignition coil 44 and the ignition discharge gear 45 are shielded.

The rectifiers 4 and 47 limit each voltage of the commutation capacitors 18 and 48 to a range between zero and the voltage of the power supply capacitor 36.

If the commutation capacitor 48 discharges to zero during the ON period of the thyristor 5, the voltage of the commutation capacitor 18 becomes the same as the voltage of the power supply capacitor 36.

* T The rectifier 46, which was previously off, turns on.

As a result, the primary current of the ignition coil 4 4 flows through the resistor 4 3, the thyristor 5, and the rectifier 46, etc. The voltages of the commutation capacitors 18 and 48 do not change. . The same is true during the ON period of the thyristor 12. Almost no current flows through the diodes 41 and 42.

In this embodiment, if the ignition discharge gear 45 is removed, a high voltage generator for generating a high voltage of ARAS and MINUS can be obtained. In addition, a discharge lamp can be connected instead of the ignition discharge gear 45. It becomes a discharge lamp lighting device

The circuit of the embodiment shown in FIG. 3 is a push-pull type inverter using power MOS FET. The same symbols are connected to the connection terminals t16 to t19, respectively.

Each power, MOS, and FET is driven by each on / off signal (turn-on signal in this case) input to each of the input terminals t20 and t21. However, the transistors 52 and 53 prevent the other power M • S • FET from being turned on while the other power MOS • FET is on. The circuit of the embodiment of FIG. 6 is a part of an ignition device for an internal combustion engine using a transistor connected in Darlington in place of the thyristor in the basic circuit of FIG. 4 (a). New use

BAD ORIGINAL The connection terminal t22 is connected to the ARAS terminal of a constant voltage circuit (not shown).

The transistors 54 to 56 constitute a PNP transistor having a high current amplification factor, and the transistors 57 to 59 constitute an NPN transistor having a high current amplification factor.

These transistors 54 to 59 are driven by on / off signals (turn-on signals in this case) input to the input terminals t23 to t24.

However, the transistors 37 and 38 prevent the transistors 54 to 59 from short-circuiting the power capacitor 36 and the like. The implementation of FIG. The on / off signal is input to each input terminal t 25 and t 26. One end of the primary coil of the ignition coil 71 is Grounded

The capacitor 62 is a countermeasure for ignition noise, and its capacity is about one hundredth of the capacity of the commutation capacitor 18. The condensers 2, the ignition coil 71 and the ignition discharge gear 45 are shielded. Resistors 4 3 and 6 1 (1 ohm each) are protection resistors.

Since the transistor 60 keeps the thyristor 15 on during the on period of the transistors 57 to 59, the transistor 37 is also always on.

While the transistors 57 to 59 or the thyristor 15 are on, a traverse ^ The transistor 37 blocks the transistors 54-56 from turning on. In addition, during the ON period of the transistors 54 to 5, the transistor 38 prevents the transistors 57 to 59 from turning on.

If 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 transistors 57 and 59, the rectifier 6, which was in the off state because of the reverse voltage, turns on. Therefore, the primary current of the ignition coil 71 flows through the resistor 61, the rectifier 6, and the thyristor 15, and as a result, the voltage of the commutation capacitor 18 does not increase any more.

On the other hand, during the on-periods of the transistors 54 to 56, the rectifier 47 prevents the voltage of the commutation capacitor 18 from reversing in the same manner as the circuit of the 61st. The same reference numerals are respectively connected to the _a connection terminals t27 to t30 which are _a part of the series type inverter. When each trigger signal is input to each of the input terminals t31 and t32, the transistor 49 is connected to the thyristor 5, 15 or 12, 22, 22 via the pulse transformer 51. Trigger.

However, the transistor 38 blocks the turn-on of the transistor 50 while the thyristor 5 or 15 is on, and the transistor 37 turns on the transistor 4 while the thyristor 12 or 22 is on. Nine Turns • Blocking the Power The circuit of the embodiment of FIG. 9 is part of an ignition system for an internal combustion engine that differs in part from the circuit of FIG. The connection terminal t33 is a positive power supply (not shown). l>

Output terminal.

Each of the transistors 65 and 66 triggers the thyristors 5 and 12, respectively, according to each trigger 1 ft signal input to each of the input terminals t34 and t35.

However, while the thyristor 5 or 15 is on, the transistor 67 prevents the transistors 6 from turning on, and while the thyristor 12 or 22 is on, the transistor 69 is turned on by the thyristor 5. Prevent the turn * on.

That is, while thyristor 5 is on, transistor 60 keeps thyristor 15 on; and, during thyristor 12 on, transistors 7-, etc. This is because 2 is kept on.

Then, by the action of thyristors 15 and 22, the voltage of commutation capacitor 18 is limited to the range between zero and the voltage of power supply capacitor 36, as in the circuits of FIGS. 6 and 7. .

Then, a short circuit between the power supply capacitor 36 and the commutation capacitor 18 due to a timing shift of the trigger is prevented.

The ignition coil 71 and the ignition discharge gap 45 are shielded to prevent ignition noise. Lastly, all of the diodes and rectifiers used in each implementation are of the Fast Reverbory type. New paper As described above, the power conversion device according to the present invention is suitable for use in various fields, particularly, an ignition device for an internal combustion engine, and the like.

New ¾

Claims

Norm

(1) One or more arms having a unidirectional controllable valve S1 in which a controllable valve S2 and a one-way valve S3 are connected in series, and a controllable valve S4 as a component When one or more arms and each of the controllable valves S2 are in the on state, the respective currents set to a size that does not prevent the turn-off of each of the controllable valves S2 are respectively applied. Flow each of the controllable valves S2 in the same direction as the forward direction of each of the controllable valves S1 without passing through the one-way valve S3 of the respective current paths;

Current detection means C S 1 for detecting all the currents;

It operates according to the current detecting stage CS1, and as long as the current detecting means CS1 detects that even one of the currents is flowing, each of the controllable valves S4 is turned on. A turn for preventing an ON signal from being input to each of the controllable valves S 4, ON signal input blocking means TI 1,

A power converter, comprising: -

(2) Each controllable valve S4 is a one-way controllable valve in which a controllable valve S5 and a unidirectional valve S6 are connected in series, and

When the respective controllable valves S5 are in the ON state, each sheet is set to a size which does not prevent the respective controllable valves S5 from turning off. Current flowing in the same direction as the forward direction of each of the controllable valves S4 to each of the m controllable valves S5 without passing through the respective one-way valves / revs S6. ,

All the controllable valves S50) current detection means C S2 for detecting the current;

It operates according to the current detection means CS2, and turns on each of the controllable valves S1 as long as the current detection means CS2 detects that at least one of the currents of the controllable valves S5 is flowing. Turn-on signal input blocking means TI 2 for preventing each turn-on signal from being input to the respective controllable valve S 1;

2. The device according to claim 1, wherein the device has:

(3) current detection means C S 3 for detecting the current of the controllable valve S5a, which is one of the plurality of controllable valves S5,

It operates in accordance with the current detection means CS3, and as long as the current detection means CS3 detects that the current of the controllable valve S5a is flowing, all of the control valves S5a except the controllable valve S5a ON state holding means K 1 for keeping control valve S 5 ON

3. The power conversion device according to claim 2, comprising:

(4) current detection means C S 4 for detecting the current of the controllable valve S 2 a which is one of the plurality of controllable valves S 2;

It operates according to the current detection means CS 4 and the current detection means CS 4 2 〇

As long as it detects that the current of the controllable valve S 2 a is flowing, on-state holding means K 2 that keeps all the controllable valves S 2 except the controllable valve S 2 a in an on state,

4. The power conversion device according to claim 1, wherein the power conversion device has: