JPS62293171A - Power circuit for large current pulse - Google Patents

Abstract

PURPOSE:To shorten the charging time for the capacitor of a constant-voltage regulated power supply part and to improve measurement efficiency by forming the output waveform from a zero cross reset circuit part into such a waveform as a trapezoid or a shifted reference level to a plus side. CONSTITUTION:In the zero cross reset circuit part F, a Zener diode ZD31 con nected in series with a resistance R2 is inserted to the circuit part of the power source which is the output side of an operational amplifier OP11 and is con nected through a resistance R1. A capacitor C11 is charged according to the reference wave form wc near to trapezoid used for phase conversion. The output waveform from the operational amplifier of a circuit part G generating a thyris tor firing waveform, applies a wide width on signal which lengthen on period by such a reference waveform as Wc near to trapezoid used for phase conver sion during the charging voltage used for the capacitor of the constant-voltage regulated power supply part reaches to a prescribed voltage. Therefore, the charging time for the capacitor of the constant-voltage regulated power supply part is shortened.

Description

[Detailed Description of the Invention] 3. Detailed Description of the Invention [Industrial Application Field] This invention is applicable to large Ff pulse currents that are required when performing characteristic tests of power thyristors, diodes, etc. This invention relates to a large current pulse power supply circuit for supplying.

[Prior Art] Characteristic test items for power thyristors, diodes, etc. include items such as forward voltage drop characteristics and surge current withstand characteristics.

In order to measure the above-mentioned characteristics, a large current pulse power supply circuit is required for passing large current pulses through the test sample.

Examples of conventional circuit configurations of the above-mentioned large-11i pulse power supply circuit are shown in FIGS. 4 and 5.

In FIG. 4, the three-phase AC input ffi (A) reduces the voltage of three-phase ACs U, V, and W (100V) to, for example, 24V using a transformer T.

In the next charging circuit section CB), the thyristor THY1,
T) IY2 and THY3 are the three-phase AC input section (
A) Three-phase alternating current U, V stepped down to, for example, 24V from A).

W is subjected to three-phase half-wave rectification, and the capacitor Go of the next constant voltage power supply section (C) is charged.

In this configuration example, 30 capacitors Co of 330,000 μF are connected in parallel because it is necessary to pass a large current through the test sample described below.

The next large current switch section (D) is composed of a plurality of field effect transistors (010s FET), and its MOS
It is turned on by the input signal of the GATE terminal section T, and the electric charge of the capacitor Co of the constant voltage power supply section (C) is discharged.

Note that in this configuration example, in order to turn on a large current in the large current switch section (D), a field effect transistor (MOS) is used.
Approximately 100 FETs are connected in parallel.

The next sample measurement section (E) is a component for measuring various characteristics of test samples such as thyristors and diodes, and includes test samples DUTI, DUT2. Connect DO↑3 as shown.

On the other hand, the thyristor THYI − of the charging circuit section (B)
The firing signal of THY3 is the thyristor THYI N
Between the gate and cathode of THY3 (+ to G1-), (G
2) is added to 2-, (3 to G3-).

The firing signal mentioned above is generated by the thyristor phase control circuit shown in FIG.

That is, this thyristor phase control circuit includes a zero-cross reset circuit section (F), a thyristor firing waveform generation circuit section (G), and a pulse conversion circuit section (H).

The thyristor phase control circuit with the above configuration is for the firing signal of the thyristor THYI, but the thyristor phase control circuit with a similar configuration is the thyristor τ)IY2,
They are also connected to THY3.

Next, the operation of the above configuration will be explained.

The operation will be described using THY 1 connected to the U phase in FIG. 5 as a representative example.

First, the U sum waveform is input from the U-phase terminal connected to the secondary side of the transformer T to the operational amplifier 0P11 of the zero-cross reset circuit section (F) in FIG.

The output side of this operational amplifier 0PII is connected to the triangular and square shape shown in the figure by charging the capacitor C11 during the positive half-wave period of the U phase and discharging it during the negative half-wave period using the +15■ power supply. Outputs waveform Wl.

The Zener diode 2011 connected to the output side of the operational amplifier 0P11 has a Zener voltage of 10V, for example, and clips the charging voltage of the capacitor C1l to 10V.

” - the triangular waveform WE as the reference waveform for phase conversion,
It is input to the operational amplifier 0P21 of the next thyristor ignition waveform generation date 118 (G).

The output waveform of this operational amplifier OP21 becomes the illustrated rectangular waveform Ws. That is, this rectangular waveform (hereinafter referred to as thyristor firing waveform) Ws is as shown in FIG.
By combining the phase conversion reference waveform Wt and the voltage V R[G of the capacitor CD in accordance with the phase waveform, a thyristor firing waveform WS of the thyristor THY 1 is obtained.

The thyristor ignition waveform Ws outputs a pulse having a certain period of intensity as shown in the figure during the period when the phase conversion reference waveform Wt and the voltage V REG of the capacitor Co overlap.

The above thyristor firing waveform WS is applied to the thyristor ↑H via 09C11 of the next pulse conversion circuit ffi (H).
It is input as an ignition signal between the gate and cand of YI (G l - K I).

That is, the thyristor T)IY1 is connected to the capacitor Go
When the charging voltage V REG of the capacitor CO is low, a firing waveform Ws with a long on period is received between G1-K1 between the gate and the cathode, and as the voltage V REG of the capacitor CO approaches a predetermined voltage, the thyristor firing waveform with a short on period is applied. Gate WS-
It will be received between the cathodes (G+ - to +).

A similar operation is also performed for thyristors THY2 and THY3 connected to the V and W phases (not shown).

The three phases of AC are controlled by the thyristor THY by the operation as shown in
It is rectified via I-THY3 and charges the capacitor CO.

Next, the field effect transistor of the large current switch section (D): 5
(MOS FET) (7) When the -tr signal is input to the MOS GATE terminal T, the field effect transistor (MOS FET) is turned on, and the sample measuring section (
A large pulse current will be passed through the test sample connected to E).

In the above case, a switch such as a thyristor connected in series with the test sample selects which sample to be tested is to be supplied with current from among the plurality of connected switches.

That is, for example, the test sample DUTI~DUτ in FIG.
In the case of a composite semiconductor device in which 3 components are sealed in one package, the constant voltage power supply section (C
) Waiting for the charging time of the capacitor Co, and when the predetermined voltage is reached, the current is passed to the next test sample [)UT2.

As described above, the sample to be tested is passed sequentially up to DO↑3.
At this time, the characteristics of the test sample, such as the voltage across the diode element, are measured to determine the forward voltage drop characteristics, and the measurement of the test sample is completed.

[Problems to be Solved by the Invention] Since the conventional high current pulse power supply circuit for measuring the characteristics of a test sample is configured as described above, a current of, for example, 5,000 A is applied to the test sample DUTI.

When current is passed for 7+ss, and then current is passed to the test sample 0UT2 under the same conditions, approximately 0 in the above configuration example until the capacitor Co of the constant voltage power supply section (C) completes charging. When measuring the characteristics of a composite semiconductor device in which a large number of elements are encapsulated, the waiting time required to charge the capacitor Co accumulates to such an extent that it cannot be ignored, and the measurement is delayed. There was a problem that efficiency was reduced.

[Purpose of the Invention] The present invention was made to solve the above-mentioned problems, and it is possible to shorten the charging time of a capacitor in a constant voltage power supply section and quickly measure the characteristics of a large number of test samples. It is an object of the present invention to provide a large current pulse power supply circuit that can improve measurement efficiency.

[Means for Solving the Problems] The large current pulse power supply circuit section according to the present invention has a zero cross reset circuit section whose output waveform is trapezoidal or a waveform in which the reference level is shifted to the positive side, and the capacitor of the constant voltage power supply section. The pulse width of the ignition signal for the thyristor in the charging circuit is widened to enable rapid charging.

[Function] In the large current pulse power supply circuit of the present invention, by making the output waveform of the zero cross 7-2 circuit part trapezoidal or a waveform in which the reference level is shifted to the positive side, the point applied to the thyristor of the charging circuit part is reduced. The pulse width of the arc signal becomes wide during the period until the charging voltage of the capacitor of the constant voltage power supply section reaches a predetermined voltage, and therefore acts to shorten the charging time of the capacitor.

[Example] An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 shows a large current pulse power supply circuit showing one embodiment of the present invention, particularly its zero-cross reset circuit section.

Note that the following generation circuit section (G) for side-rear arc and other components are the same as those of the conventional large current pulse power supply circuit, so a detailed explanation of their construction and operation will be omitted. do.

Therefore, in the zero cross reset circuit section (F) in FIG.
A Zener diode ZD31 connected in series with is inserted.

In this embodiment, the Zener diode 2031 has a Zener voltage of 10V.

With the above configuration, the capacitor C1+ is charged according to the substantially trapezoidal phase conversion reference waveform WC as shown in the figure.

When a Zener diode ZD31 with a Zener voltage of 10 V is used, the rise of the phase conversion reference waveform Wc is 5 V, and its upper limit is IOV because it is clipped by 2011.

As shown in FIG. 2 using the substantially trapezoidal one-phase conversion reference waveform WC as described above, the thyristor ignition waveform WS of the thyristor THY 1 is generated during the period until the charging voltage of the capacitor Co reaches a predetermined voltage. A wide ON signal is applied so that the ON period becomes longer, making it possible to shorten the charging time of the capacitor Co.

Next, another embodiment of the present invention is shown in FIG.

In this embodiment, a Zener diode 2041 having a Zener voltage of 5 V, for example, is connected to the output side of the operational amplifier 0PII, as shown in the figure.

According to the above configuration, when discharging in the negative half cycle of the U phase, the reference level voltage is shifted to the positive side so that the terminal voltage of the capacitor C11 becomes at least 5■ without discharging to O■. A waveform Wf is obtained.

As a result of the above, as in the previous example, the thyristor THY 1
, a wide ON signal is added so that the ON period becomes longer, and it becomes possible to shorten the charging time of the capacitor Co.

[Effects of the Invention] As is clear from the above description, according to the present invention, the output waveform of the zero cross reset circuit section in the large current pulse power supply circuit is made into a trapezoid or a waveform in which the reference level is shifted to the positive side, and the constant voltage In order to quickly charge the capacitor in the power supply section, the pulse width of the ignition signal for the thyristor in the charging circuit section is configured to be widened, so the above capacitor charging time is an example using the conventional values of each component. Then, 0
．． Compared to the previous 8 seconds, the charging time is reduced to about 0.4 seconds, which means that the charging time is about 1/2.

Therefore, the time required to reach a predetermined constant voltage is shortened accordingly.
When measuring the characteristics of a large number of test samples such as composite semiconductor devices, the required time is short and the measurement efficiency can be improved, which is an excellent effect.

[Brief explanation of the drawing]

FIG. 1 is a circuit diagram showing a zero-cross reset circuit portion in a large current pulse power supply circuit according to an embodiment of the present invention, FIG. 2 is an operation waveform diagram showing operating waveforms of each part of the above circuit, and FIG. , a circuit diagram showing a zero-cross reset circuit similar to the above showing another embodiment of the present invention, FIG. 4 is a circuit diagram showing a conventional large current pulse power supply circuit, and FIG. FIG. 6 is a circuit diagram showing the thyristor phase control circuit portion in the pulse power supply circuit, and is an operation waveform diagram showing the operation waveforms of each part in the conventional large current pulse power supply circuit. (A)...Three-phase AC section, CB)...Charging circuit section, (C)...Constant voltage power supply section, (D)...High current switch section, (E)...Sample measurement (F)...Zero cross reset circuit section, CG)...
Thyristor firing waveform generation circuit section, (H) --- pulse conversion circuit section, 0P11 --- operational amplifier, R1, R2 --- resistor, CI+- --- capacitor, 2011.2031.2041 --- Zener diode . In each figure, the same reference numerals indicate the same or equivalent parts.

Claims (1)

[Claims] A charging circuit section that rectifies alternating current with a thyristor and charges the capacitor, a constant voltage power supply section that uses the charge accumulated in the capacitor to flow a large pulse current to the test sample using a switch, and a gate-cathode section of the thyristor. In a large current pulse power supply circuit having a zero cross reset circuit and a thyristor firing waveform generating circuit that detect the voltage of the capacitor and generate a firing signal to the thyristor, the output waveform of the zero cross reset circuit is trapezoidal. Alternatively, a large current pulse power supply circuit characterized in that the reference level has a waveform shifted to the positive side, and the pulse width of the thyristor firing signal is widened so as to quickly charge the capacitor of the constant voltage power supply section.