JPS59184412A - Bidirectional energization type semiconductor breaker - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION This invention 8A relates to a bidirectional conduction type semiconductor breaker used for opening/closing a circuit and interrupting current.

A conventional circuit of this type is shown in FIG. In the figure, (IL (11) is in the direction of the gate current of the gate drive circuit not shown in the figure, and (3)
, (13) A snubber capacitor and a snubber diode are used to suppress the rise in voltage between the 7 nodes and the cathode when GT (1) or (11) turns off. (4) and (14) are GTO (υ or (11)
When the capacitor (2) or (12
) is the snubber resistor for discharging the charge while suppressing the peak discharge current value, (5)% (15) is G
T 0 (1), a blocking diode (20) for glocking the voltage applied in the opposite direction of (11);
is a DC power supply, and (30) is a load consisting of a back electromotive force (31) and a load impedance (32). Note (1)~
Element (5) is a forward breaker, (11) to (15)
The elements constitute a reverse direction breaker.

Next, the operation will be explained. G T O (1) , (1
1) Depending on the magnitude of the DC power source (20), one of the GTOs turns off, and the forward current through the GTO (1) or the GT
(A reverse current flows through J(11). Now consider the case where the back electromotive force (31) is zero.G T O(1)
If the load current is flowing in GTO (1), (11
) is supplied with a gate-off current from a gate drive circuit (not shown), both GTO(1) and (11) reach a turn-off state, and the current that had been flowing through GTO(1) is turned off from the circuit. Depending on the energy of the reactance in the snubber diode (3),
- Charge the capacitor (2). In addition, the snubber capacitor (12) also connects G T via the snubber resistor (14).
The cathode side of O(11) attempts to be charged in the direction of positive polarity. But blocking diode (15)
The voltage is divided by the ratio of the reverse leakage resistance of the GTO (1) and the blocking diode (15), and the G
A reverse voltage corresponding to the ratio is applied in the opposite direction of T 0 (11).

Since the conventional bidirectional conduction type semiconductor breaker is constructed as described above, the blocking diodes (5) and (1)
5), G T O (1), (11
) will be applied with a reverse voltage. Generally 01' 0
Since the reverse breakdown voltage of is either smaller than the forward breakdown voltage or almost non-existent, in order to keep this value within the allowable value, KGTO (1),
Blocking diodes (5) and (1) are connected in parallel to (11).
It becomes necessary to create a resistance that is sufficiently smaller than the value of the reverse leakage resistance in 5).

This invention was made in order to eliminate the drawbacks of the conventional ones as described above, and it connects a diode anti-parallel to the GTO to prevent reverse voltage from being applied to the GTO, and also allows current to flow in both directions and current to be cut off. The purpose is to provide a bidirectional conduction type semiconductor breaker.

An embodiment of the present invention will be described below with reference to the drawings. Second
In the figure, (6) and (16) are anti-parallel diodes connected in anti-parallel to G T O (1) or (11),
Otherwise, the same reference numerals as in FIG. 1 indicate the same parts. In addition, GT
'0 (1), a snubber capacitor (2), a forward circuit consisting of a snubber capacitor (2), a snubber capacitor (12) and a forward circuit consisting of a diode (3), a snubber resistor (4), and a
), snubber diode (13), snubber resistor (1
Considering the reverse direction circuit consisting of 4), in FIG. 1 the forward and reverse circuits are connected in parallel when viewed from the power source (20) and load (30), whereas in FIG. 2 they are connected in series.

Next, the operation will be explained. In the figure, GTO (1),
A gate-on current is supplied to (11) from a gate drive circuit not shown in the figure, and a back electromotive force (31) is supplied to the power supply (2).
0), the current is smaller than the power source (20), GTo(
1), the anti-parallel diode (16), the load impedance (32), and the back electromotive force (31).

At this time, gate-on current is also supplied to GT O (11), but GT O (11) is connected to anti-parallel diode (16).
reverse biased to a forward voltage drop of .

Conversely, if the back electromotive force (31) is larger than the power supply (20), the current flows through the power supply (20), the anti-parallel diode (6), and the GT
O(11), load impedance (32), back electromotive force (
31).

Now, when the back electromotive force (31) is zero and the forward current is GTO (1
), the gate-off current is applied from a gate circuit (not shown) to the gate of GTO(1),
1, GT'0(1)//i turns off, and the energy stored in the actance in the circuit charges the snubber capacitor f(2) via the snubber diode (3). The current cutoff is complete, but the source is this special electricity! ! ! (20) voltage G T O (1)
Since the anti-parallel diode (16) is connected in the forward direction, almost no voltage is applied to the reverse direction of the G T O (11). Not done. A similar operation is performed when current flows in the opposite direction.

In addition, although only the basic circuit was shown in the above embodiment, GT
Between the anode and cathode of O(1), (11) or G
Of course, the effects of the present invention can be expected even if a surge voltage suppressing capacitor, a resistance circuit, a non-linear resistor, etc. are provided between the TO (1) anode and the G TO (11) cathode.

As described above, according to the present invention, a circuit consisting of a GTO and a diode connected in antiparallel to the GTO is connected in series with the polarity reversed to constitute a bidirectional conductive type semiconductor breaker, so that a reverse voltage is applied to the GTO. In addition, it has the effect of simplifying the circuit configuration.

[Brief explanation of the drawing]

Figure 1 is a circuit diagram of a conventional bidirectional current type GTOL and disconnector.
FIG. 2 shows a bidirectional current-carrying type GTO according to an embodiment of the present invention.
The circuit diagram of L and disconnector is shown. (1n, (11)...GTOl(6), (16)...
・In anti-parallel diode diagrams, the same symbols indicate the same or equivalent parts.

Claims (1)

[Claims] A bidirectional conduction type semiconductor breaker characterized in that a circuit consisting of a gate turn-off thyristor and a diode connected in antiparallel to the gate turn-off thyristor is connected in series with reversed polarity.