JPH0576123A - Abnormality detector for noncontact contactor - Google Patents

Abstract

PURPOSE:To make an abnormality detector adaptable on a phase control noncontact contactor wherein the throw-in phase of switching element is controlled by constituting the abnormality detector of a pulse generating circuit, an OR circuit for providing output to a firing circuit, and a circuit for deciding the abnormality in a main switching circuit and outputting a detection signal. CONSTITUTION:A phase control circuit IC produces an output pulse 2 having relatively narrow width To at the position of phase control angle alpha every half period T1 of power supply waveform. On the contrary, a pulse generating circuit 9 produces an output pulse having period T3 and width T2 larger than those of the output pulse from the phase control circuit IC. Preferably, T3 is several to ten or thereabout seconds and T2 is 20 to 50mS. An OR circuit 10 delivers logical sum of output pulses from the phase control circuit and the pulse generating circuit 9, as an operational input, to a firing circuit 1B. A decision circuit 4 then makes a decision of abnormality based on an output voltage from an abnormality detector rectified through a three-phase full-wave rectifying circuit 3 and an output pulse from the OR circuit 10.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a contactless contactor abnormality detecting device for detecting an abnormality in a main switching circuit of a contactless contactor using switching elements such as thyristors and triacs.

[0002]

2. Description of the Related Art FIG. 7 is a circuit diagram of a three-phase non-contact type contactor having a conventional non-contact type contactor abnormality detecting device (hereinafter, simply referred to as an abnormality detecting device). The contactless contactor 1 is connected to each phase between a three-phase AC power supply 20 and a load 21, and is a main switching circuit 1A composed of switching elements such as thyristors and triacs, and an ignition circuit of the switching elements. 1B and an operation circuit 1D that outputs an operation input to each phase of the ignition circuit 1B. The abnormality detecting device for the contactless contactor 1 includes a three-phase full-wave rectifier circuit 3 connected to the output side of the main switching circuit 1A, an output of the three-phase rectifier circuit 3 and an output of the operation circuit 1D, that is, a point. An operation input to the arc circuit 1B and a discriminating circuit 4 which outputs a detection signal from a terminal P are inputted. This abnormality detecting device discriminates an abnormality in the discrimination circuit 4 based on the output voltage rectified by the three-phase full-wave rectification circuit 3 and the operation input to the ignition circuit 1B according to the following discrimination condition, and outputs a detection signal.

I. No operation input, output voltage: main switching circuit short-circuit II. With operation input, without output voltage ... Main switching circuit 2 phase or 3 phase open III. With operation input, large output voltage ripple ... Main switching circuit 1 phase open (3 phase full wave rectifier circuit should be single phase rectified Is going)

FIG. 8 is a circuit diagram of a contactless contactor equipped with a conventional different example of an abnormality detecting device. The abnormality detection device shown in FIG. 8 is different from the abnormality detection device shown in FIG. 7 in place of the three-phase full-wave rectifier circuit 3 and is connected to the input side and the output side of each phase of the main switching circuit 1A, The point is that an inter-electrode voltage detection circuit 7 for detecting the inter-electrode voltage between the input electrode and the output electrode of the switching element of each phase is provided. In this abnormality detecting device, the determination circuit 4 determines an abnormality based on the inter-electrode voltage of the switching element of each phase of the main switching circuit 1A and the operation input to the ignition circuit 1B according to the following determination conditions, and outputs a detection signal.

I. No operation input, zero voltage between poles in either phase ... Main switching circuit short circuit II. There is an operation input, and the voltage between contacts is either one of the phases ... Main switch circuit open

[0006]

The above-mentioned abnormality detecting device has no particular problem when it is used in a contactless contactor which simply opens and closes an electric circuit as shown in FIG. 7 or FIG. When used in a non-contact type contactor with a variable output voltage in which the closing phase of the switching element is controlled, the following problems occur.

That is, when the abnormality detecting device shown in FIG. 7 is used for a phase control type contactless contactor, the output voltage of the three-phase rectifier circuit includes a large ripple when the phase control angle becomes large, and the above-mentioned discrimination condition is satisfied. Therefore, it is determined that the main switching circuit is open for one phase. Further, in the abnormality detecting device shown in FIG. 8, when the phase control angle becomes large, a voltage between electrodes is generated between the input electrode and the output electrode of the switching element, and similarly, it is determined that the main switching circuit is opened from the above determination condition. I will end up.

An object of the present invention is to provide an abnormality detecting device for a contactless contactor applicable to a phase control type contactless contactor in which the closing phase of a switching element is controlled.

[0009]

In order to achieve the above-mentioned object, the present invention provides a main switching circuit comprising switching elements respectively connected to respective phases between a polyphase AC power source and a load, and the switching elements. And a phase control circuit connected to the firing circuit for outputting a pulse for controlling the closing phase of the switching element, for detecting an abnormality of the contactless contactor, wherein the phase control A pulse generating circuit that outputs a pulse having an output period and an output width larger than the output pulse of the circuit, the output pulse of the pulse generating circuit and the output pulse of the phase control circuit are input, and the output is input to the ignition circuit. An OR circuit, a polyphase full-wave rectifier circuit connected to the output side of the main switching circuit, and an output of the OR circuit and an output of the polyphase full-wave rectifier circuit So as comprising a discrimination circuit for outputting a detection signal to determine the abnormality of the main switch circuit. Alternatively, a pulse generation circuit that outputs a pulse having an output cycle and an output width larger than the output pulse of the phase control circuit, the output pulse of this pulse generation circuit and the output pulse of the phase control circuit are input, and the output is the point described above. An OR circuit that is input to the arc circuit and a pole that is connected to the input side and the output side of each phase of the main switching circuit and that detects the inter-electrode voltage between the input electrode and the output electrode of the switching element of each phase, respectively. An inter-voltage detecting circuit and an output of the OR circuit and an output of the inter-electrode voltage detecting circuit are inputted and a discriminating circuit for discriminating an abnormality of the main switching circuit from these outputs and outputting a detection signal. Alternatively, an inter-electrode voltage detection circuit connected to the input side and the output side of each phase of the main switching circuit to detect the inter-electrode voltage between the input electrode and the output electrode of the switching element of each phase, and the main switching circuit. A current detection circuit that detects each phase current on the output side of the circuit, an output pulse of the phase control circuit, an output of the inter-electrode voltage detection circuit, and an output of the current detection circuit are input, and the main switching circuit is output from these outputs. And a discrimination circuit that discriminates the abnormality and outputs a detection signal. Alternatively, an inter-electrode voltage detection circuit connected to the input side and the output side of each phase of the main switching circuit to detect the inter-electrode voltage between the input electrode and the output electrode of the switching element of each phase, and the main switching circuit. A phase voltage comparison circuit that compares the magnitude of each phase voltage on the output side of the circuit, an output pulse of the phase control circuit, an output of the inter-electrode voltage detection circuit, and an output of the phase voltage comparison circuit are input, and these And a discriminating circuit which discriminates an abnormality of the main switching circuit from the output of 1 and outputs a detection signal. Alternatively, an inter-electrode voltage detection circuit connected to the input side and the output side of each phase of the main switching circuit to detect the inter-electrode voltage between the input electrode and the output electrode of the switching element of each phase, and the main switching circuit. An interphase voltage comparison circuit that compares the magnitude of each interphase voltage on the output side of the circuit, an output pulse of the phase control circuit, an output of the interelectrode voltage detection circuit, and an output of the interphase voltage comparison circuit are input, and these And a discrimination circuit for discriminating an abnormality of the main switching circuit from the output and outputting a detection signal.

[0010]

According to the present invention, a main switching circuit composed of switching elements connected to each phase between a multi-phase AC power source and a load, an ignition circuit for the switching elements, and the ignition circuit connected to the ignition circuit, A device for detecting an abnormality of a contactless contactor comprising a phase control circuit for outputting a pulse for controlling a closing phase of a switching element, and outputting a pulse having an output cycle and an output width larger than the output pulse of the phase control circuit. Connected to an output side of the main switching circuit and an OR circuit to which the output pulse of the pulse generating circuit and the output pulse of the phase control circuit are input, and the output of which is input to the ignition circuit. A multi-phase full-wave rectifier circuit, an output of the OR circuit, and an output of the multi-phase full-wave rectifier circuit are input, and an abnormality is detected in the main switching circuit from these outputs and a detection signal is output. As consisting of a road, for example, in the case of three-phase alternating current was set to determine an abnormality in the next determination condition.

I. No operation input, output voltage present ... Short circuit of main switching circuit II. Operation input exists (however, during output pulse from pulse generation circuit), no output voltage
..Main switching circuit 2 phase or 3 phase open III. With operation input (however, while output pulse from pulse generating circuit is being applied), output voltage ripple is large ... Main switching circuit 1 phase open (3 (The phase full-wave rectifier circuit performs single-phase rectification)

That is, when the abnormality is discriminated by the output pulse from the pulse generation circuit, the phase control angle is set to zero. Therefore, the ripple of the output voltage of the three-phase full-wave rectifier circuit caused by the phase control is eliminated and the erroneous discrimination is prevented. Excluded.

Alternatively, a pulse generating circuit that outputs a pulse having an output period and an output width larger than the output pulse of the phase control circuit, and the output pulse of the pulse generation circuit and the output pulse of the phase control circuit are input, An OR circuit whose output is input to the ignition circuit is connected to an input side and an output side of each phase of the main switching circuit, and an inter-electrode voltage between an input electrode and an output electrode of the switching element of each phase is calculated. An inter-electrode voltage detection circuit for detecting each, and an output of the OR circuit and an output of the inter-electrode voltage detection circuit are input, and a determination circuit that determines an abnormality of the main switching circuit from these outputs and outputs a detection signal. Thus, for example, in the case of three-phase alternating current, the abnormality is determined under the following determination conditions.

I. No operation input, zero between electrodes
・ Main switching circuit short-circuit II. With operation input (however, while the output pulse from the pulse generating circuit is being applied), voltage between contacts is in any one of the phases ... Main switching circuit open

That is, when the abnormality is discriminated by the output pulse from the pulse generating circuit, the phase control angle is set to zero, so that the inter-electrode voltage of the switching element caused by the phase control is eliminated and the erroneous discrimination is eliminated.

Alternatively, an inter-electrode voltage detection circuit connected to the input side and the output side of each phase of the main switching circuit to detect the inter-electrode voltage between the input electrode and the output electrode of the switching element of each phase, respectively. A current detection circuit that detects each phase current on the output side of the main switching circuit, an output pulse of the phase control circuit, an output of the inter-electrode voltage detection circuit, and an output of the current detection circuit, and these outputs And a discrimination circuit for discriminating an abnormality of the main switching circuit and outputting a detection signal. For example, in the case of three-phase alternating current, the abnormality is discriminated under the following discrimination conditions.

I. No operation input, zero voltage between contacts ・ ・ ・ Short circuit of main switching circuit II. Operation input, no current of each phase ・ ・ ・ Main switching circuit 2 phase or 3 phase open III. Operation input, no current of 1 phase ・ ・ ・Main switching circuit 1 phase open

That is, since the abnormality of the main switching circuit is discriminated by the zero of the voltage between contacts which is not related to the phase control and the presence or absence of each phase current, erroneous discrimination caused by the phase control can be eliminated.

Alternatively, an inter-electrode voltage detecting circuit which is connected to the input side and the output side of each phase of the main switching circuit and detects the inter-electrode voltage between the input electrode and the output electrode of the switching element of each phase, respectively. A phase voltage comparison circuit for comparing the magnitude of each phase voltage on the output side of the main switching circuit, an output pulse of the phase control circuit, an output of the inter-electrode voltage detection circuit and an output of the phase voltage comparison circuit. It is configured to include a discrimination circuit which is inputted and discriminates an abnormality of the main switching circuit from these outputs and outputs a detection signal. For example, in the case of three-phase AC, the abnormality is discriminated under the following discrimination conditions.

I. With or without operation input, each phase voltage is different ... Main switching circuit short circuit or open (However, the main switching circuit is short-circuited separately with no operation input and zero voltage between contacts)

That is, since the abnormality of the main switching circuit is discriminated by the zero of the inter-electrode voltage not related to the phase control and the identity of each phase voltage, erroneous discrimination caused by the phase control can be eliminated.

Alternatively, an inter-electrode voltage detection circuit is connected to the input side and the output side of each phase of the main switching circuit and detects the inter-electrode voltage between the input electrode and the output electrode of the switching element of each phase. , An interphase voltage comparison circuit that compares the magnitude of each interphase voltage on the output side of the main switching circuit, an output pulse of the phase control circuit, an output of the interelectrode voltage detection circuit, and an output of the interphase voltage comparison circuit. For example, in the case of three-phase alternating current, the abnormality is determined under the following determination conditions so as to include a determination circuit that receives the input and determines the abnormality of the main switching circuit and outputs a detection signal.

I. With or without operation input, inconsistent voltage between each phase ... Main switching circuit short circuit or open (However, short circuit of the main switching circuit is judged separately with no operation input, zero voltage between contacts)

That is, since the abnormality of the main switching circuit is discriminated by the zeroness of the inter-electrode voltage which is not related to the phase control and the identity of the inter-phase voltage, the misjudgment caused by the phase control can be eliminated.

[0025]

1 is a circuit diagram of a three-phase contactless contactor equipped with an abnormality detecting device according to a first embodiment of the present invention. The contactless contactor 1 is connected to each phase between a three-phase AC power supply 20 and a load 21, and a main switching circuit 1A composed of a switching element such as a thyristor or a transistor,
It comprises an ignition circuit 1B for the switching element and a phase control circuit 1C for outputting a closing phase control pulse for the switching element to each phase of the ignition circuit 1B. The abnormality detecting device for the contactless contactor 1 includes a pulse generating circuit 9 for outputting a pulse having an output period and an output width larger than the output pulse of the phase control circuit 1C, and this pulse generating circuit 9
Output pulse of each phase of the phase control circuit 1C and its output is connected to the OR circuit 10 input to each phase of the ignition circuit 1B and the output side of the main switching circuit 1A. A three-phase full-wave rectifier circuit 3, and a discrimination circuit for outputting a detection signal from a terminal P to which the output of the OR circuit 10, that is, the operation input to the ignition circuit 1B and the output of the three-phase full-wave rectifier circuit 3 are input. It consists of 4.

FIG. 6 is a waveform diagram of the output pulse of the phase control circuit 1C and the output pulse of the pulse generation circuit 9. The output pulse of the phase control circuit 1C is output at the position of the phase control angle α every half cycle T1 of the power supply waveform. The pulse has a relatively narrow output width T0. On the other hand, the output pulse of the pulse generation circuit 9 has a larger output period T3 and output width T2 than the output pulse of the phase control circuit 1C, and preferably T3.
Is several seconds to ten and several seconds, and T2 is 20 to 50 milliseconds. OR
The circuit 10 outputs, to the ignition circuit 1B, a logical OR pulse of the output pulse of the phase control circuit 8 and the output pulse of the pulse generation circuit 9 as an operation input.

In this abnormality detecting device, the output voltage rectified by the three-phase full-wave rectifier circuit 3 and the output pulse of the OR circuit 10, that is, the operation input to the ignition circuit 1B, causes the determination circuit 4 to detect an abnormality according to the following determination conditions. To determine.

I. No operation input, output voltage: main switching circuit short-circuit II. With operation input (however, during the period when the output pulse from the pulse generation circuit is applied), without output voltage
..Main switch circuit 2 phase or 3 phase open III. With operation input (however, during the period when the output pulse from the pulse generation circuit is applied), large output voltage ripple ... Main switch circuit 1 phase open

The above I. The term is not related to phase control,
II. In Sections III and III, the phase control angle is set to zero when abnormality is detected by the output pulse from the pulse generation circuit 9. Therefore, the ripple of the output voltage of the three-phase full-wave rectifier circuit caused by the phase control disappears and the misjudgment is eliminated. Get burned.

As described above, when the output width T2 of the output pulse of the pulse generation circuit is set to 20 to 50 milliseconds, the time required for the determination by the determination circuit 4 is sufficiently secured, and the output cycle T3 is several seconds to 10 seconds. When it is set to several seconds, the phase control becomes zero for 20 to 50 milliseconds of the output width T2 every few seconds to ten and several seconds, and the output side voltage of this phase control type contactless contactor rises,
Since this period is short at 20 to 50 milliseconds and occurs only once every several seconds to several tens of seconds, the influence on the load is usually not a problem except a special case. In this case, the responsivity for abnormality detection is several seconds to ten and several seconds, but there is no particular problem in practical use.

FIG. 2 shows the second embodiment of the present invention.
1 is different from the abnormality detecting device of the present invention shown in FIG. 1 in that the three-phase full-wave rectifying circuit 3 is replaced by an input side and an output side of each phase of the main switching circuit 1A. The point is that an inter-electrode voltage detection circuit 7 for detecting the inter-electrode voltage between the input electrodes and the output electrodes of the switching elements of each phase, which are connected to each other, is provided. In this abnormality detecting device, the discrimination circuit 4 discriminates an abnormality from the voltage between contacts of the switching elements of each phase of the main switching circuit 1A and the operation input to the ignition circuit 1B, that is, the output of the OR circuit 10 according to the following discrimination condition. ..

I. No operation input, zero between electrodes
・ Main switching circuit short-circuit II. There is an operation input (however, during the period when the pulse output from the pulse generation circuit is being applied), and there is at least one of the voltage between contacts ... Main switch circuit open

The above I. The term is not related to phase control,
II. In the section, since the phase control angle of the switching element is set to zero when the abnormality is detected by the pulse output from the pulse generating circuit 9, the voltage between contacts of the switching element caused by the phase control is eliminated and the misjudgment is eliminated.

FIG. 3 shows a third embodiment of the present invention. Figure 3
In the abnormality detection device of the present invention, an interelectrode detecting circuit is connected to the input side and the output side of each phase of the main switching circuit 1A and detects the interelectrode voltage between the input electrode and the output electrode of the switching element of each phase. A voltage detection circuit 7, a current detection circuit 11 having a CT 11A connected to each phase on the output side of the main switching circuit 1A, and an operation input to the ignition circuit 1B, that is, a pulse for controlling the closing phase of the switching element 3. And a discriminating circuit 4 which outputs an abnormal signal from a terminal P, to which the output of the inter-electrode voltage detecting circuit 7 and the output of the current detecting circuit 11 are input. In this abnormality detecting device, an abnormality is discriminated by the discrimination circuit 4 from the inter-electrode voltage of each phase switching element of the main switching circuit 1A and each phase current on the output side according to the following discrimination conditions.

I. No operation input, zero voltage between contacts ・ ・ ・ Short circuit of main switching circuit II. With operation input, without current for each phase ・ ・ ・ Main switching circuit 2 phase or 3 phase open III. With operation input, without 1 phase current ・ ・ ・ Main switching circuit 1 phase open

The above I. The term is not related to phase control and
I. In Sections III and III, if normal, the same phase current flows to the output side regardless of the phase control, so it is possible to determine whether the main switching circuit is short-circuited or open depending on the presence or absence of each phase current on the output side.

FIG. 4 shows a fourth embodiment of the present invention. Figure 4
In the abnormality detection device of the present invention, the inter-electrode voltage connected to the input side and the output side of each phase of the main switching circuit 1A, and detecting the inter-electrode voltage between the input electrode and the output electrode of the switching element of each phase, respectively. Between the detection circuit 7, a phase voltage comparison circuit 13 connected to the output side of the main switching circuit 1A and the neutral point of the load 21A having a neutral point terminal and comparing the magnitude of each phase voltage on the output side, An output of the voltage detection circuit 7 and an output of the phase voltage comparison circuit 13 are input and a discrimination circuit 4 that outputs a detection signal from a terminal P is provided. The phase voltage comparison circuit 13
Is connected to each phase on the output side of the main switching circuit 1A,
Averaging circuit 13A for rectifying and averaging each phase voltage on the output side
And a comparison circuit 13B that compares the DC voltage of each phase on the output side that has been rectified and averaged by the averaging circuit 13A and outputs a signal indicating that these DC voltages are the same or not to the determination circuit 4. .. In this abnormality detecting device, an abnormality is discriminated by the discrimination circuit 4 based on the inter-electrode voltage of each phase switching element of the main switching circuit 1A and each phase voltage on the output side according to the following discrimination conditions.

I. With or without operation input, each phase voltage is different ... Main switching circuit short circuit or open (However, the main switching circuit is short-circuited separately with no operation input and zero voltage between contacts)

Under normal conditions, the phase voltages on the output side have the same waveform regardless of the phase control, and if there is a disparity between these phase voltages, the main switching circuit 1A is judged to be a short circuit or an open circuit. In this case, when all the switching elements of each phase have a short circuit failure, the voltages of the respective phases become equal and the phase voltage comparison circuit 13 does not output the non-uniform signals. Therefore, it is determined that there is no operation input and the voltage between contacts is zero. ..

FIG. 5 shows a fifth embodiment of the present invention.
4 is different from the abnormality detection device of the present invention shown in FIG. 4 in that an interphase voltage comparison circuit 14 connected to the output side of the main switching circuit 21 is provided in place of the phase voltage comparison circuit 13. There is a point. In this abnormality detecting device, an abnormality is discriminated by a discrimination circuit 4 based on the inter-electrode voltage of each phase switching element of the main switching circuit 1A and each inter-phase voltage on the output side according to the following discrimination conditions.

I. With or without operation input, inconsistent voltage between each phase ... Main switching circuit short circuit or open (However, short circuit of main switching circuit is judged separately with no operation input and zero voltage between contacts)

In the normal case, the inter-phase voltages on the output side have the same waveform regardless of the phase control, and if there is a disparity between the inter-phase voltages, the main switching circuit 1A is judged to be short-circuited or open. In this case, when all the phase switching elements have a short circuit fault, the interphase voltages become equal and the interphase voltage comparison circuit 1
Since 4 does not output different signals, there is no additional operation input,
Make sure that the voltage between contacts is zero.

Although the three-phase contactless contactor has been described above, the abnormality detecting device of the present invention can be used for all multi-phase contactless contactors due to its principle.

[0044]

The abnormality detecting device of the present invention is used in a phase control type contactless contactor in which the closing phase of a switching element is controlled, and no malfunction occurs. Due to its variable voltage output characteristics, the phase control type contactless contactor is extremely practical as a contactless contactor with control function, and the value of improving reliability by eliminating malfunction of the abnormality detection device is Is large.

[Brief description of drawings]

FIG. 1 is a circuit diagram of a three-phase contactless contactor including an abnormality detection device according to a first embodiment of the present invention.

FIG. 2 is a circuit diagram of a three-phase contactless contactor including an abnormality detection device according to a second embodiment of the present invention.

FIG. 3 is a circuit diagram of a three-phase contactless contactor including an abnormality detection device according to a third embodiment of the present invention.

FIG. 4 is a circuit diagram of a three-phase contactless contactor including an abnormality detection device according to a fourth embodiment of the present invention.

FIG. 5 is a circuit diagram of a three-phase contactless contactor including an abnormality detection device according to a fifth embodiment of the present invention.

FIG. 6 is a waveform chart for explaining the operation of the abnormality detection device in the first embodiment of the present invention shown in FIG.

FIG. 7 is a circuit diagram of a three-phase contactless contactor including a conventional abnormality detection device.

FIG. 8 is a circuit diagram of a three-phase contactless contact provided with a conventional different example of an abnormality detection device.

[Explanation of symbols]

 1 Contactless Contactor 1A Main Switching Circuit 1B Ignition Circuit 1C Phase Control Circuit 3 3-Phase Full-Wave Rectifier Circuit 4 Discrimination Circuit 7 Inter-Pole Voltage Detection Circuit 9 Pulse Generation Circuit 10 OR Circuit 11 Current Detection Circuit 13 Phase Voltage Comparison Circuit 14 Phase-to-phase voltage comparison circuit 20 3-phase AC power supply 21 Load 21A Load having a neutral point terminal

Claims (5)

[Claims] 1. A main switching circuit comprising switching elements respectively connected to respective phases between a polyphase AC power source and a load,
A device for detecting an abnormality of a contactless contactor comprising a switching element ignition circuit and a phase control circuit connected to the ignition circuit and configured to output a pulse for closing phase control of the switching element, A pulse generation circuit that outputs a pulse having an output period and an output width larger than the output pulse of the phase control circuit, an output pulse of the pulse generation circuit and an output pulse of the phase control circuit are input, and the output is the ignition. An OR circuit input to the circuit, a multi-phase full-wave rectification circuit connected to the output side of the main switching circuit, and the O
Abnormality of the contactless contactor, characterized in that the output of the R circuit and the output of the multiphase full-wave rectification circuit are inputted and a discrimination circuit for discriminating abnormality of the main switching circuit from these outputs and outputting a detection signal. Detection device. 2. A main switching circuit comprising switching elements respectively connected to respective phases between a multi-phase AC power supply and a load,
A device for detecting an abnormality of a contactless contactor comprising a switching element ignition circuit and a phase control circuit connected to the ignition circuit and configured to output a pulse for closing phase control of the switching element, A pulse generation circuit that outputs a pulse having an output period and an output width larger than the output pulse of the phase control circuit, an output pulse of the pulse generation circuit and an output pulse of the phase control circuit are input, and the output is the ignition. An OR circuit that is input to the circuit, and a gap between the input and output sides of each phase of the main switching circuit, which detects the gap voltage between the input and output electrodes of the switching element of each phase. Voltage detection circuit and the OR
Abnormality detection of a contactless contactor, characterized in that the circuit output and the output of the inter-electrode voltage detection circuit are input, and a discrimination circuit that discriminates the abnormality of the main switching circuit from these outputs and outputs a detection signal apparatus. 3. A main switching circuit comprising switching elements respectively connected to each phase between a multi-phase AC power supply and a load,
A device for detecting an abnormality of a contactless contactor comprising a switching element ignition circuit and a phase control circuit connected to the ignition circuit and configured to output a pulse for closing phase control of the switching element, An inter-electrode voltage detection circuit connected to the input side and the output side of each phase of the main switching circuit to detect the inter-electrode voltage between the input electrode and the output electrode of the switching element of each phase, and the main switching circuit The current detection circuit for detecting each phase current on the output side of, the output pulse of the phase control circuit, the output of the inter-electrode voltage detection circuit and the output of the current detection circuit are input, and from these outputs of the main switching circuit An abnormality detection device for a contactless contactor, comprising: a determination circuit that determines an abnormality and outputs a detection signal. 4. A main switching circuit comprising switching elements respectively connected to respective phases between a multi-phase AC power source and a load,
A device for detecting an abnormality of a contactless contactor comprising a switching element ignition circuit and a phase control circuit connected to the ignition circuit and configured to output a pulse for closing phase control of the switching element, An inter-electrode voltage detection circuit connected to the input side and the output side of each phase of the main switching circuit to detect the inter-electrode voltage between the input electrode and the output electrode of the switching element of each phase, and the main switching circuit The phase voltage comparison circuit that compares the magnitude of each phase voltage on the output side of the, the output pulse of the phase control circuit, the output of the inter-electrode voltage detection circuit and the output of the phase voltage comparison circuit are input, and these An abnormality detection device for a contactless contactor, comprising: a determination circuit that determines an abnormality of a main switching circuit from an output and outputs a detection signal. 5. A main switching circuit comprising switching elements respectively connected to respective phases between a polyphase AC power source and a load,
A device for detecting an abnormality of a contactless contactor comprising a switching element ignition circuit and a phase control circuit connected to the ignition circuit and configured to output a pulse for closing phase control of the switching element, An inter-electrode voltage detection circuit connected to the input side and the output side of each phase of the main switching circuit to detect the inter-electrode voltage between the input electrode and the output electrode of the switching element of each phase, and the main switching circuit The phase voltage comparison circuit that compares the magnitudes of the inter-phase voltages on the output side, the output pulse of the phase control circuit, the output of the inter-electrode voltage detection circuit, and the output of the inter-phase voltage comparison circuit are input. An abnormality detection device for a contactless contactor, comprising: a determination circuit that determines an abnormality of the main switching circuit and outputs a detection signal.