JPH06351224A - Firing circuit device of semiconductor element - Google Patents

Abstract

PURPOSE:To make a device small by installing a transistor whose base side is connected across a first resistance and a switching element, whose emitter side is connected across a second resistance and a first power supply and whose collector side is connected to the switching element. CONSTITUTION:When an ON instruction is introduced from a drive input terminal 39, a third transistor 37 and a first transistor 34 are turned on, a driving instruction is introduced simultaneously, and a second power supply 28 is driven. At this time, since the voltage of the power supply 28 is higher than that of a first power supply 27, a current flows to a gate terminal 29 via the transistor 34. The current is increased gradually, it becomes definite, and it functions as an overdriving current. Then, when the supply period of an overdriving power supply is finished, a stop instruction is introduced from the drive input terminal, and the power supply 28 is stopped. After this point of time, a current flows to the gate terminal from a firing DC power supply for the power supply 27, but it is at a steady-state driving current value. Consequently, the current in two stages can be made to flow to the gate terminal by the transistor 34 only, and the title device can be made small.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention turns on and off large-capacity semiconductor elements such as a gate turn-off thyristor (hereinafter referred to as GTO), a power transistor and an electrostatic induction thyristor, and has a sharp rise at the start of turning on. The present invention relates to an ignition circuit of a semiconductor device having a so-called overdrive function of flowing a large current.

[0002]

2. Description of the Related Art FIG. 7 is a block diagram showing a configuration of a conventional GTO gate drive circuit disclosed in, for example, Japanese Patent Laid-Open No. 2-288727, and FIG. 8 is an on-gate overdrive current output circuit 1 and an on-gate shown in FIG. FIG. 9 is a circuit diagram showing details of the long current output circuit 2, FIG. 9 is a waveform diagram showing changes in the gate current of the GTO of FIG. 7, and FIG. 10 is a circuit diagram for explaining the principle of the constant current circuit.

In FIG. 8, 3 is a direct current power source for ignition, 4
Is a gate terminal connected to the + side of the DC power supply 3, 5 is a cathode terminal connected to the − side of the DC power supply 3, and 6 is a current limiting device connected between the DC power supply 3 and the gate terminal 4. The first resistor, 7 is a first transistor for turning on / off the long current, and between the first resistor 6 and the gate terminal 4, the emitter side is the first resistor 6 and the collector side is the gate terminal. 4 are connected respectively. Reference numeral 8 is a second transistor for constant current, the emitter side is between the first resistor 6 and the DC power source 3, the collector side is the base side of the first transistor 7, and the base side is the second resistor. 1 through 9
Are connected between the resistor 6 and the emitter side of the first transistor 7, respectively.

Reference numeral 10 is a third transistor for turning on / off the base current of the first transistor 7. The collector side is the base side of the first transistor 7 via the third resistor 11, and the emitter side is a DC power source. The − side of 3 and the base side are connected to the drive input terminal 12 for the ON / OFF command of the GTO. The first and second transistors 7 and 8 and the first, second and third resistors 6, 9 and 11 constitute the on-gate long current output circuit 2.

Reference numeral 13 is a fourth resistance for limiting current, which is connected in parallel with the first resistance 6 between the + side of the DC power supply 3 and the gate terminal 4, and 14 is ON / OFF current for overdrive.
The fourth transistor for use is connected between the fourth resistor 13 and the gate terminal 4, the emitter side is connected to the fourth resistor 13, and the collector side is connected to the gate terminal 4. 15
Is the fifth transistor for constant current, the emitter side is the fourth
Between the resistor 13 and the DC power source 3, the collector side is the base side of the fourth transistor 14, and the base side is the fifth resistor 16 between the fourth resistor 13 and the fourth transistor 14. They are respectively connected to the emitter side.

Reference numeral 17 is a sixth transistor for turning on / off the base current of the fourth transistor 14, and the collector side is connected to the base side of the fourth transistor 14 via the sixth resistor 18, and the base side is connected to one end. The output side of the overdrive current transmission period setting circuit 19 connected to the drive input terminal 12 is connected, and the emitter side is connected between the − side of the DC power supply 3 and the emitter side of the third transistor 10, respectively. Then, the fourth and fifth transistors 14, 15 and the fourth, fifth and sixth resistors 13, 16,
An on-gate overdrive current output circuit 1 is constituted by 18.

Next, the conventional GT configured as described above
The operation of the O gate drive circuit will be described. As can be seen from FIG. 9, the gate current of the GTO of the drive circuit needs to flow an on-gate overdrive current larger than the on-gate length / width current for a certain period. How the GTO gate drive circuit in FIG. 8 operates to generate the waveform current as shown in FIG. 9 will be described based on the principle of the constant current generation circuit in FIG.

In the figure, 20 is a DC power source, 21 is a load resistor connected to both ends of this DC current 20, 22 is a constant current resistor connected between the + side of the DC power source 20 and the load resistor 21. , 23 are current ON / OFF transistors, and between the constant current resistor 22 and the load resistor 21, the emitter side is connected to the constant current resistor 22 and the collector side is connected to the load resistor 21. 24 is a constant current transistor, the emitter side is between the + side of the DC power source 20 and the constant current resistor 24, and the collector side is a current ON / OFF.
The base side of the transistor 23 is connected to the base side of the constant current resistor 22 and the base side of the current ON / OFF transistor 23 via the base resistor 25. Reference numeral 26 is a base resistor having one end connected to the base side of the current ON / OFF transistor 23 and the other end connected to the − side of the DC power supply 20, respectively.

In the constant current circuit configured as described above, if the resistance value of the load resistor 21 becomes small when the DC power source 20 is connected, the collector current value I _{C of the} current ON / OFF transistor 23. Will increase. And
The collector current value I _C becomes the value of the following formula (1). I _C = (R ₁ · I _C + R ₂ · I _B ) / V _BE1 (1) where I _{B is} the base current value of the constant current transistor 24 V _BE1 : The voltage value between the emitter and the base of the constant current transistor R ₁ : the resistance value of the constant current resistor 22 R ₂ : the resistance value of the base resistor 25 Thus, when the collector current value I _C value becomes the above equation (1), The transistor 24 for constant current is turned on, and the current is turned on /
An attempt is made to turn off the OFF transistor 23.

However, when the current ON / OFF transistor 23 is about to be turned off, the collector current value I _C is reduced, and when the collector current value I _C is reduced, the constant current transistor 24 is about to be turned off. The transistor 23 for use turns on. Therefore, the collector current value I _C becomes a constant current with the value of the equation (1),
Even if the load resistance 21 is short-circuited, the collector current value I _C becomes a constant current. The on-gate overdrive current output circuit 1 and the on-gate long-width current output circuit 2 in FIG. 8 utilize this constant current circuit. First, when the ON command is introduced from the drive input terminal 12, the third and sixth The transistors 10 and 17 are turned on at the same time, and the first and fourth transistors 7 and 14 are also turned on.

Then, the first transistor 7 is turned on, and the constant current I _b flowing through the first resistor 6, that is, the on-gate long-width current, is turned on, the fourth transistor 14 is turned on and the constant current flowing through the fourth resistor 13 is reached. _Ia is summed up and flows into the gate terminal 4 as an on-gate overdrive current. Next, when the sending period set by the overdrive current sending period setting circuit 19 ends, the sixth transistor 17 is turned off and the fourth transistor 1
4 is also turned off, and the current flowing into the gate terminal 4 is only the on-gate length width current I _b .

[0012]

Since the conventional ignition circuit device for semiconductor elements is configured as described above, two circuits of the on-gate overdrive current output circuit 1 and the on-gate long-width current output circuit 2 are provided. In addition, it is necessary to separate the two circuits 1 and 2 from each other, so that it is necessary to individually cool the switching elements, which causes an increase in the size of the semiconductor circuit firing circuit device.

The present invention has been made to solve the above-mentioned problems, and an ignition circuit device for a semiconductor device capable of supplying an overdrive current and a steady drive current without switching in one circuit and enabling miniaturization. Aim to get.

[0014]

[Means for Solving the Problems] Claim 1 according to the present invention
The semiconductor element firing circuit device of the first is connected in parallel
A first resistor connected between the second power supply and the switching element connected to the + side first output terminal side of both power supplies, and the first and second resistors on the first output terminal side. A second resistor connected in series with the first resistor and a second resistor
Of the diode connected in parallel with the first power source in the forward direction, and the base side between the first resistor and the switching element, and between the second resistor and the diode and the first power source. And a transistor whose emitter side is connected to the switching element and whose collector side is connected to the switching element.

According to a second aspect of the present invention, there is provided a semiconductor element firing circuit device in which a first power supply is provided between the second resistor and the diode and the first power supply and between the emitter side of the transistor. The second diode is connected in the forward direction.

According to a third aspect of the present invention, there is provided a semiconductor element firing circuit device in which a first power source for ignition and first and second sides of the first power source connected to the positive side and the negative side, respectively. A second output terminal, a pulse transformer connected in parallel with the first power supply, a first switching element connected to the first output terminal side and driven by an input from a drive input terminal,
A first resistor connected between the power supply and the secondary side of the pulse transformer and the first switching element, and the primary side of the first power supply and the pulse transformer at the first output terminal side and the pulse transformer. A second resistor connected in series with the first resistor between the secondary side, a diode connected in parallel with the second resistor and in the forward direction with the first power source, and a first resistor, The base side is between the switching element and the emitter side between the second resistor and the diode and the first power supply, and
Is connected to the switching element of which the collector side is connected and the second output terminal side of the primary side of the pulse transformer, and is turned on during the overdrive current supply period.
And a second switching element for performing ON / OFF at a high frequency.

[0017]

According to the first aspect of the present invention, the second resistance of the semiconductor element firing circuit device allows the current of the second power source to flow, and
The diode generates an overdrive current by blocking its flow, and the diode generates a steady drive current by supplying all the current of the first power supply, and outputs the steady drive current to the first output terminal, respectively.

The second diode of the semiconductor element ignition circuit device according to the second aspect of the present invention causes the steady drive current and the overdrive current to increase by causing the currents of the first and second power supplies to flow. Output to the output terminal of.

The second switching element of the semiconductor element firing circuit device according to claim 3 of the present invention is ON / OFF.
Is performed at a high frequency to generate a voltage for overdrive in the pulse transformer and output an overdrive current to the first output terminal.

[0020]

EXAMPLES Example 1. An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 shows G in Embodiment 1 of the present invention.
It is a circuit diagram which shows the structure of a TO ignition circuit device. In the figure, 27 is a first DC power source for ignition, and 28 is this first power source.
Second power supply for overdrive which is connected in parallel to the power supply 27 and is driven and controlled by a signal input to the drive input terminal 39. The output voltage of the second power supply is set higher than the output voltage of the first power supply 27. There is. 29 and 30 are the first and second
Of the power supplies 27 and 28 of FIG.

Reference numeral 31 is a first resistor for current limiting connected between the first and second power supplies 27 and 28 and the gate terminal 29, and 32 is the first and second power supplies 2 on the gate terminal 29 side.
A second resistor for current limiting 33, which is connected in series with the first resistor 31 between 7 and 28, is connected in parallel with the second resistor 32 and in the forward direction with the first power supply 27. A diode 34 is a first transistor for turning on / off the current, and between the first resistor 31 and the gate terminal 29, the emitter side is the first resistor 31, and the collector side is the gate terminal 29.
Respectively connected to.

Reference numeral 35 is a second transistor for constant current,
The emitter side has the second resistor 32, the diode 33 and the first resistor 32.
Power supply 27, the collector side is the base side of the first transistor 34, and the base side is the third side for the base.
Are connected between the first resistor 31 and the emitter side of the first transistor 34, respectively.
37 is ON / OF of the base current of the first transistor 34
In the third transistor for F, the emitter side is the − side of the first and second power supplies 27 and 28, and the collector side is the base of the first transistor 34 via the fourth resistor 38 for the base. Side, and the base side is connected to the drive input terminal 39 for the GTO on / off command.

Next, the operation of the GTO ignition circuit device of the first embodiment constructed as described above will be described. First, when the ON command is introduced from the drive input terminal 39, the third and first transistors 37 and 34 are turned ON, and at the same time, the drive command is introduced from the drive input terminal 39 and the second power supply 28 is driven. At this time, the voltage of the second power supply 28 is higher than the voltage of the first power supply 27, so the circuit is as shown in FIG. 2, and the gate terminal is connected from the second power supply 28 via the first transistor 34. An electric current starts to flow in 29 and gradually increases.

Then, the current Ip flowing through the gate terminal 29
Becomes constant until the following equation (2) is satisfied. Ip · R1 = I _C2 · R2 + V _BE2 + I _B2 · R3 ... (2) where R1: the resistance value of the first resistor 31 R2: the resistance value of the second resistor 32 R3: the second Resistance value of the resistor 36 of 3 I _C2 : collector current of the second transistor 35 I _B2 : base current of the second transistor 35 V _BE2 : base-emitter voltage of the second transistor 35 The current Ip in () functions as an overdrive current.

Next, when the supply period of the overdrive power supply ends, a stop command is introduced from the drive input terminal 39 and the second power supply 28 stops. Then, after this time point, a current flows from the igniting DC power source of the first power source 27 to the gate terminal 29, instead of the second power source 28. At this time, the current Ig flowing through the gate terminal 29, that is, the steady drive current value is a constant value that satisfies the following expression (3). _{Ig · R1 + V D1 = V} BE2 + I B2 · R3 ··········· (3) where, V _D1: the order of the diode 33 forward voltage drop

Since the GTO ignition circuit device according to the first embodiment is configured as described above, the first transistor 3
It is possible to pass a two-step current of an overdrive current and a steady drive current to the gate terminal 29 only with 4, and
When the above equations (2) and (3) are transformed into the equations of Ip and Ig, the following equations (4) and (5) are obtained. Ip = (I _C2 · R2 + X) / R1 ・ ・ ・ ・ ・ ・ ・ ・ (4) Ig = (X−V _DL ) / R1 ・ ・ ・ ・ ・ ・ ・ ・.. (5) However, X: V _BE2 + I _{B2 .R3} Then, comparing equation (4) and equation (5), all values are positive values, so Ip> Ig holds, and in the conventional case It can be confirmed that the overdrive current value is larger than the steady drive current value in the same manner as.

Example 2. FIG. 3 shows G of Embodiment 2 of the present invention.
It is a circuit diagram which shows the structure of a TO ignition circuit device. In the figure, the same parts as those in the first embodiment are designated by the same reference numerals and the description thereof will be omitted. Reference numeral 40 denotes an FET as a switch for turning on / off the current, which is connected instead of the first transistor 34 shown in FIG. Reference numeral 41 is a second diode connected in the forward direction with the first power supply 27 between the first power supply 27 and the diode 33 and between the emitter side of the second transistor 35.

Next, the operation of the GTO ignition circuit device of the second embodiment constructed as described above will be explained. First, since the basic operation is the same as that of the first embodiment, the overdrive current value Ip 'and the steady drive current value Ig' in this circuit are obtained here. First, for the overdrive current Ip ', the forward voltage drop of the second diode 41 is set to V _D2, and other values are the same as those in the first embodiment, the following formula (6) is established. _{R1 · Ip '= I C2 ·} R2 + V D2 + V BE2 + I B2 · R3 ···· (6) The equation (6) Ip' formula is modified to equation becomes (7). Ip ′ = (X + I _C2 · R2 + V _D2 ) / R1 Ip ′ = Ip + V _D2 / R1 (7)

On the other hand, the following equation (8) is established for the steady drive current Ig '. Ig ′ · R1 + V _D1 = V _D2 + V _BE2 + I _B2 · R3 ... (8) When this equation (8) is transformed into the equation of Ig ′, the following equation (9) is obtained. Ig ′ = (X−V _D1 + V _D2 ) / R1 Ig ′ = Ig + V _D2 / R1 (9) As described above, the GTO point in the second embodiment Since the arc circuit device is constructed, both the overdrive current value Ip 'and the steady drive current value Ig' are larger by V _D2 / R1 than in the first embodiment, as can be seen from the above equations (7) and (9). Has become. Therefore, it is possible to deal with a large-capacity semiconductor element simply by adding the second diode 41.

Example 3. Although the overdrive current value and the steady drive current value are increased by adding the second diode 41 in the second embodiment, if it is desired to increase only the overdrive current value, the second resistor 3 is used.
It can be easily increased only by increasing the resistance value of 2.

Example 4. FIG. 4 shows G of Embodiment 4 of the present invention.
It is a circuit diagram which shows the structure of a TO ignition circuit device. In the figure, the same parts as those in the first embodiment are designated by the same reference numerals and the description thereof will be omitted. Reference numeral 42 denotes a capacitor as a power source for overdriving. One end is between the second resistor 32 and the diode 33 and the first resistor 31, and the other end is the FET 43 as an auxiliary switch. Are connected to the negative side of each. 44 is a third power source for negative bias direct current connected to the cathode terminal 30 in series with the first power source 27, and 45 is the third power source 4 on the emitter side.
The negative side of 4 and the side of the collector are fourth transistors connected between the capacitor 42 and the FET 43 via the gate terminal 29, the first power supply 27, and the third diode 46 in the forward direction.

Next, the operation of the GTO ignition circuit device of the fourth embodiment constructed as described above will be explained. First, when a drive input terminal (not shown) introduces an OFF command,
The third and first transistors 37, 34 and the FET 43 are turned off, and the fourth transistor 45 is turned on.
Then, a negative bias current is applied from the + side of the third power supply 44 to the cathode terminal 30 → load (not shown) → gate terminal 29 →
The current flows from the fourth transistor 45 to the negative side of the third power supply 44.

At this time, the first transistor 34 is turned off.
Therefore, the capacitor 42 is charged by adding the total voltage of the voltage of the first power supply 27 and the voltage of the third power supply 44 to both ends thereof. Then, the charging energy of the capacitor 42 becomes a value shown in the following formula (10). (1 / 2C ₁ ) · (V ₁ + V ₃ ) ² (10) where C _{1 is} the capacitance of the capacitor 42 V _{1 is} the first power supply 27 voltage V ₃ : voltage of the third power supply 44

Next, when a drive input terminal (not shown) introduces an ON command, the fourth transistor 45 is turned off, and the third and first transistors 37, 34 and the FET 43 are turned on. Then, the capacitor 42 works as an overdrive power source by the energy charged by the above equation (10), and the + side of the capacitor 42 → the first resistor 31 → the first transistor 34 → the gate terminal 29 → the load (not shown). ) → cathode terminal 30 → FET 43 → capacitor 42
The overdrive current flows along the route of-side.
Then, the overdrive current flows and the capacitor 42
When the voltage across both ends of the first power supply 27 reaches the voltage V ₁ of the first power supply 27, the same operation as in the first embodiment is performed by the first power supply 27 and a steady drive current flows.

Since the GTO ignition circuit device according to the fourth embodiment is configured as described above, the same effects as those of the above-described respective embodiments are obtained, and the overdrive current is changed only by changing the capacitance of the capacitor 42. It is possible to easily adjust the supply period.

Example 5. FIG. 5 shows G of Embodiment 5 of the present invention.
It is a circuit diagram which shows the structure of a TO ignition circuit device. In the figure, the same parts as those in the fourth embodiment are designated by the same reference numerals and the description thereof will be omitted. Reference numeral 47 denotes one end between the − side of the first power supply 27 and the + side of the third power supply 44, and the other end of the second power supply via the fourth diode 48 in the opposite direction to the first power supply 27. An overdrive power supply coil connected between the resistor 32 and the diode 33 and the first resistor 31 and between the collector side of the fourth transistor 45 and the gate terminal 29, and 49 is the gate terminal 29. And the fourth transistor 45
Is a fifth diode connected in the forward direction with the first power supply 27 between the collector and the collector side of the.

Next, the operation of the GTO ignition circuit device of the fifth embodiment constructed as described above will be explained. First, when a drive input terminal (not shown) introduces an OFF command,
The third and first transistors 37, 34 are turned off,
The fourth transistor 45 is turned on. Then, a negative bias current is applied from the + side of the third power supply 44 to the cathode terminal 30.
→ load (not shown) → gate terminal 29 → fifth diode 49 → fourth transistor 45 → third power supply 44-
While flowing along the route of the side, + of the third power supply 44
The flow also goes to the route of side → coil 47 → fourth transistor 45 → − side of the third power supply 44.

At this time, the energy stored in the coil 47 has a value represented by the following equation (11). _{(1 / 2L) · I L} 2 ···················· (11) where, L: inductance I _L of the coil 47: current flowing through the coil 47

Next, when a drive input terminal (not shown) introduces an ON command, the fourth transistor 45 is turned OFF, and the third and first transistors 37, 34 are turned ON. Then, the coil 47 acts as an overdrive power source by the energy stored in the above equation (11),
7 → fourth diode 48 → first resistance 31 → first transistor 34 → gate terminal 29 → load (not shown) →
An overdrive current flows along the route from the cathode terminal 30 to the coil 47.

Then, when the overdrive current flows and the voltage across the coil 47 reaches the voltage V ₁ of the first power supply 27, the same operation as in the first embodiment is performed by the first power supply 27 and the steady drive is performed. Flows. Since the GTO ignition circuit device in the fifth embodiment is configured as described above,
In addition to the same effects as those of the above-described respective embodiments, when the energy is stored by the coil, there is an effect that there is no problem of regulation of the ripple current.

Example 6. FIG. 6 shows G of Embodiment 6 of the present invention.
It is a circuit diagram which shows the structure of a TO ignition circuit device. In the figure, the same parts as those in the first embodiment are designated by the same reference numerals and the description thereof will be omitted. 50 has a primary side in parallel with the first power supply 27,
A pulse transformer whose one end on the secondary side is connected between the second resistor 32 and the diode 33 and the first resistor 31, and the other end is connected to the cathode terminal 30, 51 is the primary side of the pulse transformer 50 The fifth side, in which the collector side is connected to the primary side of the pulse transformer 50 and the emitter side is connected to the-side of the first power supply 27, respectively, with respect to the-side of the first power supply 27.
Is a transistor.

Next, the operation of the GTO ignition circuit device of the sixth embodiment constructed as described above will be described. First, when an ON command is introduced from a drive input terminal (not shown)
At the same time that the first transistors 37 and 34 are turned on, the fifth transistor 51 is turned on / off at a high frequency. Then, the pulse voltage waveform boosted to the voltage determined by the turn ratio of the pulse transformer 50 appears on the secondary side. Then, this pulse voltage waveform is rectified on the secondary side and converted into direct current to function as an overdrive power source, and the same operation as in the first embodiment is performed, and an overdrive current flows.

When the supply period of the overdrive current is finished, the fifth transistor 51 is turned off, and thereafter the steady drive current flows by the first power supply 27. Since the ignition circuit device according to the sixth embodiment is configured as described above, the same effects as those of the above-described respective embodiments are obtained, and the fifth transistor 51 is turned on and off.
Thus, it is possible to easily set the overdrive current supply period.

Example 7. In the sixth embodiment, the power supply for overdrive is supplied from the first power supply 27 via the fifth transistor 51 by the pulse transformer 50, but a pulse is supplied from an external power supply via the fifth transistor 51. Even if it is supplied by the transformer 50, the same effect as that of the sixth embodiment can be obtained.

Example 8. In each of the above embodiments, the GTO firing circuit device has been described, but the present invention is not limited to this. For example, a firing circuit device based on a power transistor also has the same effect.

[0046]

As described above, according to the first aspect of the present invention, the first and second power supplies connected in parallel and the switching connected to the + side first output terminal side of both power supplies. A first resistor connected between the first resistor and a second resistor connected in series with the first resistor between the first and second power supplies on the first output terminal side; A diode connected in parallel with the resistor in the forward direction with the first power source, a base side between the first resistor and the switching element, and an emitter between the second resistor and the diode and the first power source. And a transistor whose collector side is connected to the switching element,

According to a second aspect of the present invention, a second resistor connected in the forward direction between the second resistor and diode and the first power source and between the emitter side of the transistor and the first power source. Equipped with a diode of

According to claim 3 of the present invention, the first power source for ignition, the first and second output terminals respectively connected to the + side and the-side of the first power source, A pulse transformer connected in parallel with the first power supply, a first switching element connected to the first output terminal side and driven by an input from a drive input terminal, a secondary side of the first power supply and the pulse transformer A first resistor connected between the first switching element and the first switching element, and a first output terminal side between the first power source and the primary side of the pulse transformer and the secondary side of the pulse transformer. A second resistor connected in series with the resistor of, a diode connected in parallel with the second resistor in the forward direction with the first power source, and a base side between the first resistor and the switching element, In addition, the emitter side is between the second resistor and diode and the first power supply. Also a transistor collector side to the first switching elements connected respectively, the second performing the ON / OFF at a high frequency to the second connection to the overdrive current supply period at the output terminal side of the primary side of the pulse transformer
Since it is provided with the above switching element, it is possible to obtain an ignition circuit device of a semiconductor element that can supply an overdrive current and a steady drive current without switching in one circuit and can be downsized.

[Brief description of drawings]

FIG. 1 is a circuit diagram showing a configuration of a GTO firing circuit device according to a first embodiment of the present invention.

FIG. 2 is a circuit diagram for explaining a flow of overdrive current of the GTO firing circuit device in FIG.

FIG. 3 is a circuit diagram showing a configuration of a GTO firing circuit device according to a second embodiment of the present invention.

FIG. 4 is a circuit diagram showing a configuration of a GTO firing circuit device according to Example 4 of the present invention.

FIG. 5 is a circuit diagram showing a configuration of a GTO firing circuit device according to a fifth embodiment of the present invention.

FIG. 6 is a circuit diagram showing a configuration of a GTO firing circuit device according to Embodiment 6 of the present invention.

FIG. 7 is a circuit diagram showing a configuration of a conventional GTO firing circuit device.

FIG. 8 is a circuit diagram showing details of an on-gate overdrive current output circuit and an on-gate long-width current output circuit of the GTO ignition circuit device shown in FIG. 7.

9 is a waveform diagram showing changes in the gate current of the GTO ignition circuit device shown in FIG.

FIG. 10 is a circuit diagram for explaining the principle of a constant current circuit.

[Explanation of symbols]

 27 1st power supply 28 2nd power supply 29 Gate terminal (1st output terminal) 30 Cathode terminal (2nd output terminal) 31 1st resistance 32 2nd resistance 33 Diode 34 1st transistor 35 2nd Transistor 36 third resistor 37 third transistor 38 fourth resistor 39 drive input terminal 40, 43 FET 41 second diode 42 capacitor 44 third power supply 45 fourth transistor 47 coil 50 pulse transformer 51 fifth Transistor

─────────────────────────────────────────────────── ───

[Procedure amendment]

[Submission date] November 19, 1993

[Procedure Amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0033

[Correction method] Change

[Correction content]

At this time, the first transistor 34 is turned off.
Therefore, the capacitor 42 is charged by adding the total voltage of the voltage of the first power supply 27 and the voltage of the third power supply 44 to both ends thereof. Then, the charging energy of the capacitor 42 becomes a value shown in the following formula (10). (1/2) C ₁ · (V ₁ + V ₃ ) ² ······································· (10) However, C ₁ : capacitance of the capacitor 42 V ₁ Voltage of power supply 27 V ₃ : Voltage of third power supply 44

[Procedure Amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0038

[Correction method] Change

[Correction content]

At this time, the energy stored in the coil 47 has a value represented by the following equation (11). ( 1/2) L · I _L ² (11) where L: Inductance of coil 47 I _L : Coil 4
Current value flowing in 7

Claims (3)

[Claims] 1. A first power supply for ignition, a second power supply for overdrive connected in parallel with the first power supply, and positive and negative sides of the first and second power supplies. First and second output terminals respectively connected to the switching element, a switching element connected to the first output terminal side and driven by an input from a drive input terminal, the first and second power supplies, and A first resistor connected between the switching element and a second resistor, and a second resistor connected in series with the first resistor between the first and second power sources on the first output terminal side; A diode connected in parallel to the second resistor and in the forward direction with the first power source, a base side between the first resistor and the switching element, and the second resistor and the diode. Between the first power supply and the emitter side, and the switching What is claimed is: 1. An ignition circuit device for a semiconductor device, comprising: an element; and a transistor whose collector side is connected to each element. 2. A second diode connected in the forward direction to the first power source is provided between the second resistor and the diode and the first power source and between the emitter side of the transistor. An ignition circuit device for a semiconductor device according to claim 1. 3. A first power source for ignition, first and second output terminals respectively connected to the + side and − side of the first power source, and connected in parallel with the first power source. Pulse transformer, a first switching element connected to the first output terminal side and driven by an input from a drive input terminal, the first power source and the secondary side of the pulse transformer, and the first switching element. A first resistor connected between the switching element and the first output terminal side, the first power source and the first side between the primary side of the pulse transformer and the secondary side of the pulse transformer. A second resistor connected in series with the first resistor; a diode connected in parallel with the second resistor and in the forward direction with the first power source; a first resistor and the switching element; Between the base side, the second resistor and the diode. Transistor connected to the first switching element on the emitter side and to the first switching element on the collector side, and to the second output terminal side on the primary side of the pulse transformer to overdrive. An ignition circuit device for a semiconductor element, comprising: a second switching element for performing ON / OFF at a high frequency during a current supply period.