JP3368706B2 - Hybrid switch - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [0001] BACKGROUND OF THE INVENTION The present invention relates to an electromagnetic contactor,
Conductor switch element and main contact of electromagnetic contactor open
Main semiconductor switch element only for the time to perform operation and closing operation
A drive signal to turn on the element is given to the main semiconductor switch element.
Related to a hybrid switch having a control circuit
Solving the problems of conventional hybrid switches
To its improved configuration. [0002] 2. Description of the Related Art An electromagnetic contactor and a semiconductor switch element are assembled.
Reduce the wear of the main contacts of the magnetic contactor.
Hybrid switch configured to be able to
However, it is installed for applications where opening and closing operations are repeated frequently.
It is widely used as a switch. This kind of high
Brid Switch from the same applicant as Japanese Patent Application No. 6-8213
No. 7 filed. The following is a description of this Japanese Patent Application Hei 6-8.
Based on the contents of hybrid switch according to 2137
Next, a conventional hybrid switch will be described. FIG. 5 shows a conventional hybrid switch.
FIG. 3 is a circuit diagram showing a partial block together with a peripheral device.
FIG. 6 shows the control circuit and the semiconductor switch shown in FIG.
The element pairs are partially blocked and partially omitted.
FIG. FIG. 7 shows the hybrid shown in FIG. 5 and FIG.
Wave to explain the normal operation of the switch
FIG. FIG. 8 shows the hybrid shown in FIGS. 5 and 6.
Waveform diagram of main part for explaining operation when switch is abnormal
(A) is a waveform when a contact failure occurs in the auxiliary contact.
FIG. 8B is a diagram illustrating a case where a contact failure occurs at a main contact.
It is a waveform diagram. [0005] In FIGS. 5 to 7, reference numeral 9 denotes an electromagnetic contactor 6.
And a group of main semiconductor switch element pairs 7 and a control circuit 8.
This is a hybrid switch. The electromagnetic contactor 6
In the case of the above case, the main contact portion 6 composed of three main contacts 611
1, an auxiliary contact 62 which is normally closed, and an operation coil.
And a known electromagnetic contactor including Operation carp
The switch 63 for operating instructions from the external operating power supply 91
The operating voltage Vc is supplied via the switch 92. Leader
The group of the body switch element pairs 7 includes the number of the main contacts 611 in the group.
In response, three main semiconductor switch element pairs 7A, 7B, 7
C is provided. Each main semiconductor switch element
Pair 7 (hereinafter referred to as main semiconductor switch element pairs 7A, 7B, 7C
Are sometimes referred to as follows. )
Are main thyristors 71 and 7 which are main semiconductor switch elements.
2 connected in anti-parallel.
The interconnection points of the nodes 71 and 72 are
It is electrically connected to the point 611 in parallel. The control circuit 8 includes a rectifying / smoothing circuit 81 and an electric
Pressure stabilizing circuit 82, input voltage detecting circuit 83,
Path 84, a one-shot pulse generation circuit 85, and a driving circuit.
Roads 86A, 86B and 86C are provided. Also control
The circuit 8 has a terminal 81 for receiving the operating voltage Vc.
a, 81b and a terminal 84 connected to the auxiliary contact 62.
a, 84b. The rectifying / smoothing circuit 81 has a terminal
An operating voltage V, which is an AC voltage input to 81a and 81b.
converts c into DC electricity and smoothes pulsating components
And a capacitor from the output end.
Outputs a smoothed DC voltage. Voltage stabilization circuit 82
Receives the DC voltage output from the rectifier / smoothing circuit 81.
Force, this voltage corresponds to the fluctuation of the voltage value of the operating voltage Vc.
Since it has a fluctuating value, it has a stable constant value.
And converts it to a DC voltage and outputs it. [0006] The input voltage detecting circuit 83 is a voltage stabilizing circuit.
The DC voltage output from 82 is input, and this voltage value is
When the voltage required for the operation of the hybrid switch 9 is reached
High level (hereinafter abbreviated as "H")
There is. ), And if the specified value is not reached,
Level (hereinafter, may be abbreviated as “L”).
Signal S₈₃Is output. When the specified value has not been reached
Low level signal S₈₃But a hybrid switch
9, the operation voltage Vc applied to the operation coil 63
Is a signal corresponding to the application timing. Determination circuit 84
Are connected to the terminals 84a and 84b,
2 is in the state of contact whether it is closed or open
Correspondingly, the signal S which becomes "H" and "L"₈₄Output
You. “H” and “L” corresponding to the state of the auxiliary contact
Signal S₈₄Is the power in the hybrid switch 9.
The opening / closing timing of the auxiliary contact 62 of the magnetic contactor 6
The corresponding signal. [0007] The one-shot pulse generation circuit 85 outputs a signal
S₈₃And signal S₈₄And pulse output S₈₅Output
You. This pulse output S₈₅Is the signal S₈₃Is "H",
Moreover, the signal S₈₄Is changed from “H” to “L”.
The signal S₈₄Falls from "H" to "L"
Time width t output at point_a With one shot
And the signal S₈₄Is "L" and
No. S₈₃Is changed from "H" to "L"
Is the signal S₈₃Falls from “H” to “L”
Output time width t_bIs a one-shot pulse
You. The driving circuit 86 (hereinafter referred to as driving circuits 86A, 8
When referring to 6B and 86C collectively, say this
There is. ) Shows a photocoupler 87 as a circuit element,
Iodes 881 and 882 and resistance elements 883 to 886
, A condenser 887, and a surge absorber 888
These circuit elements are shown in FIG.
Connected to each other. The photo coupler 87 is a light emitting element.
A known device including a child 871 and a phototriac 872
It is an element having a configuration, and has photocouplers 87A, 87B,
The light emitting elements 871 included in each of the 87Cs are electrically connected to each other.
Connected in series, and the pulse output S
₈₅Is entered. As a result, the drive circuit 86
Output S₈₅Is "H", the semiconductor switch element pair
7 is supplied with a firing signal which is a drive signal for turning it on.
And surge absorber 888, resistance element 886,
By the capacitor 887, the semiconductor switch element pair 7 is connected.
Protects against overvoltage. The hybrid switch 9 is provided with the electromagnetic switch described above.
The contactor 6 and the semiconductor switch element pair 7 are electrically connected in parallel.
Connected, in this case a three
The parallel connection of the contact 611 and the semiconductor switch element pair 7
Each has one end of the hybrid switch 9
Connected to input terminals R, S, T, the other end is high
Connected to the output terminals U, V, W of the brid switch 9
I have. The input terminals R, S, T are, for example, not shown.
Connected to the three-phase main power supply, and these output terminals U, V, W
Is connected to, for example, a three-phase load (not shown). That
In the case, the hybrid switch 9 is connected to the load from the main power supply.
ON / OFF of AC power supplied to the switch 92
And the main power is turned on.
During this period, the load current I flows to the load.
You. Thus, the main contact 61 of the electromagnetic contactor 6
The operation mechanism for turning on and off 1 is already known.
Although it is not shown in the drawing, it is assembled with the operation coil 63.
Having a combined stator core and movable core,
The movable contacts 611 and the auxiliary contacts 62 have respectively
It is configured to be moved in accordance with the movement of this movable core.
Have been. An operation voltage Vc is applied to the operation coil 63
Then, the movable core starts moving toward the stator core. So
At this time, the auxiliary contact 62 is closed by the main contact 611 and the electromagnetic contact.
The contactor 6 is configured to be opened before being turned on.
Have been. Further, supply of the operation voltage Vc to the operation coil 63 is performed.
When the feed is stopped, the movable core will separate from the stator core
Start moving. Then, at that time, the auxiliary contact 62
Means that the main contact 611 is open and the electromagnetic contactor 6 is in the cut-off state.
After that, it is configured to be closed. [0011] The hybrid of the prior art constructed as described above.
The normal operation of the switch 9 will be described with reference to FIG.
An operation voltage Vc is applied according to a command from the switch 92.
Then, the main contact 611 becomes the time t_Three, But the signal S
₈₄Indicates “H” or “H” corresponding to the closed / open state of the auxiliary contact 62.
And "L", the time t_ThreeBefore
Time t_TwoSwitches from "H" to "L". Signal S
₈₃Changes from “L” to “H” when the operating voltage Vc is applied.
When it is necessary to move the movable core because it is a switching signal
Time t delayed by_TwoTime t before₁Cut to "H"
Has been replaced. From these, one-shot pulse generation
From the circuit 85, the time t_TwoAt time t_ThreeUntil later
Continued time width t_a Pulse output S with₈₅Is output. This pulse output S₈₅Drive times by receiving
The main semiconductor switch is switched by the ignition output output from the path 86.
The main thyristors 71 and 72 of the switch element pair 7 are turned on.
Become. Then, at this time t_Two Hybrids at
Switch 9 is turned on, and load current I is applied to main thyristor.
By flowing through 71 and 72, the flow starts.
You. Time t_Three , The main contact 611 is closed.
Therefore, most of the load current I is
It flows through the point 611, and the time width t_a Later
Even if the iristors 71 and 72 are turned off, what is the load current I?
The flow continues without change. Hybrids
When the switch 9 is closed, the main thyristors 71 and 72
Time t during which the load current I flows_aTIs the time t_Two From time t
_Three It is a very short time until. The operation is performed in accordance with a command from the switch 92.
When the supply of the voltage Vc is stopped, the main contact 611 becomes at the time t.
_Five Is opened at the signal S₈₄Is the time t_Five And it
Before that, the “L” state is continued at time t_Five Later than
It switches from "L" to "H". Signal S₈₃Is the operating voltage
When the supply of Vc is stopped, "H" is switched to "L".
Signal, the time required to move the armature is delayed.
Time t_Five Time t before_Four To switch to "L"
ing. From these, the one-shot pulse generation circuit 85
From time t_Four At time t_Five Time to continue
Width t_b Pulse output S with₈₅Is output. This pulse
Output S₈₅Received from the drive circuit 86
Due to the arc output, the main thyristors 71 and 72 operate at the time t._Four
Is turned on again. Therefore, at time t_Five Becomes the main contact 611
Is opened, the load current I becomes the main thyristors 71 and 72.
It will flow through. Time width t_b Later time t₆
At the pulse output S₈₅Becomes “L”, and the driving circuit 86
The ignition output from the AC power supply is stopped.
Time t which is the loss point₇ In the main thyristors 71, 7
2 turns off. Then, at this time t₇ High in
The bridge switch 9 is turned off, and the load current I becomes negative.
Supply to the load is stopped. Hybrid switch 9 shielding
During the disconnection operation, the load current I passes through the main thyristors 71 and 72.
Flowing time t_bTIs the time t_Five From time t₇ Up to
It's a short time. Incidentally, the electromagnetic contactor 6 is used alone.
As is well known, when turning on and off,
From the state where the main contact 611 is not completely closed, the main contact 61
1 begins to flow the load current I, and the main contact 611
Is not fully open, the load current
Since the flow of I is continued, the movable contact of the main contact 611 is
An arc occurs between the point and the fixed contact. Therefore,
Electromagnetic used in harsh conditions, such as when switching is frequently performed
In the contactor 6, the main contact 6
It becomes a problem that wear of 11 becomes severe. On the other hand, the hybrid switch 9
It operates as described above during its closing and closing operations.
At the time before the main contact 611 during the closing operation is closed.
t_Two Time width t from_aTMain contact during and during shut-off operation
Time t after point 611 is opened_Five Time width t from_bT
During this time, the main thyristors 71 and 72 are turned on, respectively.
During this time width, the load current I is applied to the main thyristors 71 and 72.
Flow through. As a result, during the closing and closing operations
The main contact 611 is worn out due to
Since there is no such switch, the hybrid switch 9
Frequent disconnection or load arcing
Even in the case of inductive load, etc.
It is possible to perform the cutoff operation. And the Lord
The time during which the load current I flows through the thyristors 71 and 72 is
Since the time is short, the main thyristors 71 and 72 are small.
A thyristor with a capacity can be used. However, such hybrids
Even with the switch 9, the main contact 611 and the auxiliary contact 62 do not
The occurrence of a good state is not zero. Next, referring to FIG.
As a result, a defective state occurred in the main contact 611 and the auxiliary contact 62.
The operation of the hybrid switch 9 in the case will be described.
You. FIG. 8A shows a case where the auxiliary contact 62 has a poor contact.
The waveform diagram in the case is shown. The operation voltage Vc is applied.
At time t_TenAt the signal S₈₃Changes from "L" to "H"
Assume that it has been switched. This auxiliary contact 62 has poor contact.
Occurs, regardless of the presence or absence of the operating voltage Vc.
And signal S₈₄Keeps "L". For this purpose
The pulse output S from the one-shot pulse generation circuit 85₈₅
Is not output, so that the main thyristors 71 and 72
In this case, it does not turn on. Then, the main contact 61
Time t when 1 is closed₁₁The load current I starts flowing
I do. In this state, the operation voltage Vc is supplied.
The supply is stopped and the time t₁₂At the signal S₈₃Is "H"
Are switched to “L”. In this case,
No. S₈₄Is “L”, so the one-shot pulse generation cycle
Time width t from road 85_bPulse output S with₈₅Is output
It is. As a result, the time t₁₂To time width t_b During the drive
The circuit 86 outputs a firing output. Main thyristor 7
1,72 is thus the time width t_b Is on during
Time t₁₃After the main contact 611 is opened at
t_bTDuring this time, the load current I flows. Follow
In this case, the hybrid switch 9 is blocked.
Load current I flows through main thyristors 71 and 72 during disconnection operation
Time span t_bTIs equivalent to the normal time span.
You. FIG. 8B shows that the main contact 611 is in contact.
FIG. 3 shows a waveform diagram when a defect occurs. Operating voltage V
c is applied, the time t₂₀At the signal S₈₃But
It is assumed that “L” has been switched to “H”. Signal S₈₄
Is the time t, as in the normal case shown in FIG.₂₀From late
Time t_{twenty one}Is switched from "H" to "L".
The one-shot pulse generation circuit 85 has a regular signal
S₈₃, S₈₄Is input, one-shot pulse generation
The circuit 85 operates at time t_{twenty one}At time t_a Pulse with
Output S₈₅And the main thyristors 71 and 72 are turned on.
become. Since the main contact 611 is not closed, the main thyristor
Time 71, 72_{twenty one}Start of load current I
And the time width t_a Later time t_{twenty two}At the pulse output S
₈₅Becomes "L" and the ignition output from the drive circuit 86 stops.
At the time t, which is the next zero crossing point of the AC power supply.
_{twenty three}, The flow of the load current I is stopped. Therefore,
, The closing operation of the hybrid switch 9
When the load current I flows through the main thyristors 71 and 72
Spacing t_aT2 Is when the load current I flows in the normal state
Spacing t_aTBut slightly longer. In this state, the operation voltage Vc is supplied.
The supply is stopped and the time t_{twenty four}At the signal S₈₃Is "H"
Are switched to “L”. In this case,
No. S₈₄Is “L”, so the one-shot pulse generation cycle
Time width t from road 85_bPulse output S with₈₅Is output
It is. As a result, the time t_{twenty four}To time width t_b During the drive
The circuit 86 outputs a firing output. Main thyristor 7
1 and 72 are turned on by this, and at time t_{twenty five}Drive
AC power after the ignition output from the drive circuit 86 is stopped.
Time t, the next zero crossing point of the source₂₆At the load current
Stop the flow of I. Therefore, in this case,
When the hybrid switch 9 is turned off, the main thyristor 7
Time width t during which load current I flows through 1, 72_bT2 Is normal
Time t during which load current I flows_bTLess than
But it gets longer. As described above, the hybrid switch 9
Indicates that contact failure occurred in the main contact 611 and the auxiliary contact 62.
Hive due to the main contact 611 being defective.
Degradation of the function as a lid switch is unavoidable,
The main thyristors 71 and 72 are damaged by overload.
Can be prevented. [0022] According to the above-mentioned prior art,
Hybrid switches that are turned on and shut off
No arc was generated at the main contact 611 at the time of the disconnection operation.
To obtain a switch with high long-term reliability.
You. However, the following problems still remain.
ing. That is, the input voltage detection provided in the control circuit 8
Signal S output from circuit 83₈₃Is a switch for operation commands.
Switch 92, the switch is immediately turned on.
Switch to “H” corresponding to the command of switch 92
Required. This is because the one-shot pulse generation circuit 85
Before the auxiliary contact 62 is opened,
The signal S output from the determination circuit 84₈₄Is from "H"
Before switching to "L", switch to "H"
This is because it is essential. However, the operating voltage Vc
Are input to the control circuit 8, the rectifying / smoothing circuit 81,
DC voltage is converted by the voltage stabilizing circuit 82,
To a DC voltage smoothed by capacitors, etc.
And it is stabilized at a constant voltage value. For this purpose, the signal S₈₃Is the capacity of the capacitor
There is always a delay time determined by the time constant according to the amount
are doing. In the conventional hybrid switch 9, this
To minimize the delay time, the capacity of the capacitor
The value is set near the lower limit required for smoothing. However
However, there is room for the capacitor value
Otherwise, the margin for the change in the value of the operating voltage Vc decreases.
Would be. In the hybrid switch 9, the delay
The delay time and the coping with the fluctuation of the value of the operating voltage Vc are compatible.
The capacitance value is set so that
The margin is small both in the interval and in the fluctuation of the value of the operating voltage Vc.
There was nothing. In addition, the one circuit provided in the control circuit 8
The pulse output S from the shot pulse generating circuit 85₈₅Is output
The main contact 611 has not yet been closed
Are supplied from the drive circuit 86 to the main thyristors 71 and 72.
The ignition output is a fixed contact forming the main contact 611.
From the voltage between the
It is supplied directly. That is, for example, the input terminal R
→ Diode 881 → Resistance element 885 → Phototrier
Current through the route of the block 872 → the resistance element 884 → the output terminal U
Flows through the resistive element 885 and the photo triac.
The voltage obtained in the series circuit with the 872 is the main thyristor
Between the gates, which are control poles that 71 and 72 have, respectively.
This is the firing output that can be obtained. In this case, between the input terminal R and the output terminal U
, That is, the fixed contact of the main contact 611 and the movable contact
The voltage value between the points becomes a considerably high value. On the other hand,
The point 611 indicates that the movable contact is fixed when the circuit is closed.
Even if they come in contact with each other, they will separate again, no
They tend to bounce several times. main
When the contact 611 causes this bounce, the fixed contact and the movable
Since the voltage applied to the contact is high,
An arc is generated between the movable contact and the main contact 611.
The hybrid switch 9
Long-term reliability is to be compromised. Also,
One-shot pulse generation circuit 85 included in control circuit 8
Is the signal S₈₃And the signal S₈₄And are mandatory. others
In the control circuit 8, the signal S₈₄Auxiliary contact 62 which is the source of
Input is essential. However,
Some uses of the hybrid switch 9 include hybrid
The output of the auxiliary contact 62 must be supplied to the outside of the switch 9.
You may have to. For example, a motor that performs reversible operation
For interlocks, brake control of electric motors, etc.
You. In such cases, a non-standard but multiple
Hybrid switch with electromagnetic contactor with contacts
It is necessary to prepare. Furthermore, hybrid
The main semiconductor switch element included in the
The thyristors 71 and 72 are only used when the main contact 611 is opened and closed.
Since the load current I does not flow, the main thyristors 71 and 72
With a small capacity. But c
For use in opening and closing the hybrid switch 9 more frequently
The main thyristors 71 and 72 have the load current I
Need to further reduce the flow time
It is becoming. The present invention has been made in view of the above-mentioned problems of the prior art.
The purpose is to reduce the arc of the main contact.
Hybrid switch that can further reduce wear due to
To provide. [0026] According to the present invention, the aforementioned eye
The target is the main contact, the auxiliary contact, the main contact and the auxiliary contact.
Electromagnetic contactor having operating coil for performing opening and closing operations
And the main contact of the electromagnetic contactor
The main semiconductor switch element pair connected in parallel and the electromagnetic contact
For the main contacts of the switch to open and close
Only the drive signal that turns on the main semiconductor switch element pair
A control circuit provided to the semiconductor switch element pair.
A bridging switch comprising a main semiconductor switching element pair
Are semiconductor switches electrically connected in anti-parallel to each other
The control circuit is composed of at least an electromagnetic contactor.
Operating voltage applied to an operating coil having a timing
Input a signal corresponding to the
Signal and auxiliary switch opening / closing timing of the electromagnetic contactor
To the main semiconductor switch element based on the signal corresponding to
A hybrid switch that generates a drive signal
The control circuit has a main semiconductor switch element pair
The control pole of the main semiconductor switch element that composes the
The drive circuit that outputs the drive signal is the main semiconductor switch element.
Of each semiconductor switch element that composes the
Resistance element connected between
Cathode is placed electrically in parallel with the element and on the control pole side
Diodes connected to each other
Input terminal via a resistance element between the cathode side of the
Rectifier circuit to which the power supply is connected, and the DC output terminal of the rectifier circuit
Auxiliary semiconductor switch element connected between slaves and rectifier circuit
Between the DC output terminals of the unit via at least a resistance element
Capacitors, and capacitors and auxiliary semiconductor switches
Phototransistor connected to the control pole of the device
And give a conduction signal to the phototransistor with light.
A light emitting element is generated in the control circuit.
Corresponding to the drive signal given to the main
Signal that emits light for a conduction signal in response to a signal
Is achieved. [0030] According to the present invention, the hybrid switch
The control circuit has a main semiconductor switch element pair.
Drives toward the control pole of the main semiconductor switch element to be formed
The drive circuit section that outputs signals is composed of a main semiconductor switch element pair
Cathode of each semiconductor switch element that composes
And a resistance element connected between the control electrode and the control electrode
The cathode is arranged electrically in parallel with the control electrode side.
Diodes connected to each other
The input terminal is connected between the cathode side of the
Between the connected rectifier circuit and the DC output terminal of the rectifier circuit
The auxiliary semiconductor switch element connected to the
Connected between the DC output terminals via at least a resistance element
Capacitors, and capacitors and auxiliary semiconductor switch elements
Phototransistor connected to the control pole of the device
To provide a conduction signal to the phototransistor by light.
An optical element, wherein the light emitting element is generated in the control circuit.
Corresponding to the drive signal given to the main semiconductor switch element
Structure that emits light for conduction signal according to signal
By doing so, the closing finger by the switch 92 is
During the period in which no
For example, if the input terminal R → diode → diode
Resistor connected to the cathode side → one of the rectifier circuit parts
Input terminal → the other input terminal of the rectifier circuit → diode
A current flows through the path from the resistance element connected to the column to the output terminal U.
Will be. Then, the closing command by the switch 92 is
The phototransistor is turned off when it is not
Connected between both terminals on the DC output side of the rectifier circuit.
The auxiliary semiconductor switch element thus set is also turned off. this
As a result, the above-mentioned current flows between both terminals on the DC output side of the rectifier circuit.
Charge the capacitor connected through a resistor
And is mainly spent on. In this state, the switch 92
Command is issued and the signal S₈₃Equivalent to
Signal is output, the phototransistor is turned on.
The charging voltage of the capacitor is
Is applied to the control pole of the
It is. When the auxiliary semiconductor switch element is turned on,
Since both output terminals of the road are short-circuited,
From the terminal R to the output terminal U via the rectifier circuit
The value of the current flowing in the path thus increased increases. Current increases
Because of this current, the cathode of the diode
The voltage value generated in the resistance element connected to the side also increases.
In the case of the present invention, the voltage generated in this resistance element
Is the firing output for the main semiconductor switch element,
The main semiconductor switch element turns on. Then, according to the present invention,
The charge voltage of the capacitor is controlled by the control electrode of the auxiliary semiconductor switch element.
To turn on the auxiliary semiconductor switch element.
Any value that is sufficient is sufficient, at most about 1 [V]
Is good. Therefore, the phototransistor is turned off.
For example, the input terminal R and the output terminal
The voltage value between U and U is a sufficiently small value as compared with the conventional example.
It is possible to As a result, the main characteristics of the electromagnetic contactor
Bounce occurs at the main contact when trying to close the contact
Even so, there is no arc between the fixed and movable contacts.
It rarely occurs. [0033] 1 shows a hybrid switch according to the present invention.
Circuit diagram showing the switch in a partial block with peripheral devices
FIG. 2 shows the control circuit and the semiconductor switch shown in FIG.
Switch element pairs are partially blocked and partially omitted.
FIG. 1 and 2, FIGS. 5 and 6
Same parts as the conventional hybrid switch shown in
Are denoted by the same reference numerals, and description thereof is omitted. The figure
1, in FIG. 2, the reference numerals in FIG. 5 and FIG.
Only representative symbols are shown. In FIGS. 1 and 2, reference numeral 1 denotes FIGS. 5 and 6.
For the hybrid switch 9 according to the conventional example shown,
The control circuit 2 is used instead of the control circuit 8, and the power supply
This is a hybrid switch including the road 3.
The power supply circuit 3 includes a rectifying / smoothing circuit 31 and a voltage stabilizing circuit.
82. The rectification / smoothing circuit 31 is operated by an operation command.
From the external operation power supply 91 without using the switch 92
The operation voltage Vc is directly input. And this exchange
When the operating voltage Vc, which is a voltage, is converted into DC electricity,
Equipped with a capacitor for smoothing the pulsation component
The smoothed DC voltage from its output
Output to the stabilizing circuit 82. Rectifying / smoothing circuit 31 is a conventional example
The point different from the rectification / smoothing circuit 81 by
For smoothing the pulsating component of the
The capacitance value of the sensor should be a sufficient value required by the control circuit 2.
Is to be. The control circuit 2 is a conventional example shown in FIG.
Rectifier / smoothing circuit 81
To use the rectifying / smoothing circuit 21
The stabilizing circuit 82 is omitted. The input of the control circuit 2
Force voltage detection circuit 83, discrimination circuit 84, one-shot pal
The control circuit 2 includes the DC power supply
Terminals 2a. Power supply circuit 3 installed from 2b
The DC output voltage output from the voltage stabilizing circuit 82
Depends. Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
This will be described in detail. Embodiment 1 FIG. 3 shows an embodiment of the present invention.
Of the control circuit of the hybrid switch
It is the circuit diagram shown with a peripheral device. In FIG.
Hybrid switch according to prior art shown in FIGS. 5 and 6
The same reference numerals are given to the same parts as those described above, and the description thereof is omitted.
Note that, in FIG. 3, the reference numerals used in FIGS.
Indicates only representative symbols. In FIG. 3, 2B
Is a hybrid switch according to the conventional example shown in FIGS.
The control circuit 8 included in the switch 9 is replaced with a drive circuit 86.
This is a control circuit in which the drive circuit 3 is used. What
FIG. 3 corresponds to the drive circuit 86A in the conventional example.
Only the driving circuit 3 is shown. The driving circuit 3 is composed of a driving circuit 8 according to the prior art.
6, the photocoupler 3 is replaced with the photocoupler 87.
1 and a full-wave rectifier circuit 32 as a circuit element.
And an auxiliary thyristor 33 as an auxiliary semiconductor switch element.
And a bipolar transistor 3 as a semiconductor control element
4, a constant voltage diode 35, a diode 36,
Capacitor 37 and additional resistance elements 381-386.
These circuit elements are shown in FIG.
Connected to each other. The photocoupler 31 is a light emitting element.
Publicly-known device provided with a pixel 871 and a phototransistor 311
An element having a configuration. Light emission of the photocoupler 31
As in the case of the control circuit 8 of the conventional example, the element 871 has
Pulse output S₈₅Is entered. In the embodiment shown in FIG.
Thus, the drive circuit 3 operates as described below. That is,
When a closing command is issued from the operation command switch 92,
If not, pulse output S₈₅Is "L",
The phototransistor 311 is off. Also the Lord
Since the contact 611 is open, the main semiconductor switch element
Interconnection of main thyristors 71 and 72 constituting child pair 7
The voltage of the main power supply is applied to the connection point. To this voltage
Therefore, current flows through the drive circuit 3 with the following path as a main path.
Flows. That is, for example, the input terminal R → the diode 8
81 → resistance element 885 → full wave rectifier circuit 32 → resistance element 3
82 to 385, a resistance element 386 and a capacitor.
Parallel circuit with the series circuit of the circuit 37 → full-wave rectifier circuit 32 →
The path from the resistance element 884 to the output terminal U. Of this current, the resistance of the resistance elements 382 to 385
The current flowing through the series circuit causes the resistance element 385 to be charged.
Voltage is generated and the bipolar transistor 34 is turned on.
Therefore, the auxiliary thyristor 33 is turned off. Also,
Of the current, a series circuit of a resistor 386 and a capacitor 37
The capacitor 37 is charged by the current flowing through the capacitor 37.
When the charge voltage value of the capacitor 37 is
When the Zener voltage value reaches
The charging is terminated, and the excess current is supplied to the diode 36.
Through the constant voltage diode 35 via the
You. Thus, a switch-in command is issued from the switch 92.
If not, the capacitor 37 is connected to the mains voltage.
Is equal to the Zener voltage value of the constant voltage diode 35.
It will be charged to a new voltage value. In this state, the closing command from the switch 92 is
Output, pulse output S₈₅Is switched to "H",
Pulse output S₈₅Causes the light emitting element 871 to emit light.
The phototransistor 311 switches from off to on
Wrong. When the phototransistor 311 turns on, first,
The potential of the base of the bipolar transistor 34 is the collector
, The bipolar transistor 34
Turned off. In addition, the power charged in the capacitor 37 is
The pressure changes from the capacitor 37 to the diode 36 to the resistance element 38
3 → Phototransistor 311 → Auxiliary thyristor 33
Discharge occurs in the gate path, and the auxiliary thyristor 33 turns on.
You. When the auxiliary thyristor 33 is turned on, the full-wave rectifier circuit 3
2 is short-circuited. In this state, the main power supply
From the voltage, for example, input terminal R → diode 881 → resistance
Element 885 → all short-circuited by auxiliary thyristor 33
Wave rectifier circuit 32 → resistance element 884 → output terminal U
Electric current flows. The current value in this case is determined by the switch 9 described above.
Than the current value when the feed command from 2 has not been issued
growing. With this large current value, the resistance element 885
And the voltage obtained by the series circuit body of the full-wave rectifier circuit 32 and
Control poles of the main thyristors 71 and 72
The firing output provided between the gates,
The thyristors 71 and 72 are turned on. By the operation of the control circuit 2B described above,
The waveform diagram obtained in the main part of the control circuit 2B is the same as that of the conventional example.
The control circuit 9 is exactly the same as that shown in FIG.
You. In the case of the present invention,
As described above, the value of the charging voltage of the capacitor 37 is
Since only about 1 [V] is sufficient,
Example in a period in which the transistor 311 is off
For example, the voltage value between the input terminal R and the output terminal U is
It is possible to set a sufficiently low value as compared with the example. this
As a result, the main contact 611 of the electromagnetic contactor 6 is closed.
When the bounce occurs at the main contact 611
But almost no arc between the fixed and movable contacts
Or even if an arc occurs
Since the arc has a weak energy, the main contact 61
1 hardly causes wear due to the arc. This
Thereby, the hybrid switch including the control circuit 2B
Can improve long-term reliability.
You. Embodiment 2 FIG. 4 shows a different embodiment of the present invention.
Main part of control circuit provided in hybrid switch according to example
FIG. 3 is a circuit diagram showing the device together with peripheral devices. Figure 4
The hybrid according to the embodiment of the present invention shown in FIG.
Control circuit provided in the switch, and shown in FIGS.
The same parts as the conventional hybrid switch
The same reference numerals are given and the description is omitted. Note that in FIG.
Are the reference numerals given in FIG. 3 and the reference numerals given in FIGS.
As for the numbers, only representative codes are described. Figure 4
2C is the hybrid according to the present invention shown in FIG.
For the control circuit 2B of the switch, the drive circuit 3
A control circuit that uses the drive circuit 3A instead.
You. In FIG. 4, as in the case of FIG.
Only the drive circuit 3A corresponding to the drive circuit 86A in FIG.
are doing. The driving circuit 3A includes the driving circuit 3 according to the present invention.
In addition, the resistance element 386 is deleted and
Using a resistance element 389 connected in parallel to the
I am trying to. In the embodiment shown in FIG.
The operation performed by the drive circuit 3A is performed by the drive circuit 3 described above.
The difference from the operation is that
Only. Therefore, the part related to the resistance element 389
The functions provided by the drive circuit 3A in other than
Since the function is the same as that of the circuit 3, the same function
The description of is omitted. By the way, from the operation command switch 92
Power supply voltage when no power-on command is issued.
The main path of the current flowing through the driving circuit 3A is
The rectifier circuit 32 and subsequent ones are as follows. Whole wave
A parallel circuit of the rectifier circuit 32 → the resistance element 382 →
A series circuit of the resistance elements 383 to 385;
9 and capacitor 37 in series) → full-wave rectifier circuit 32
is there. Then, even with this circuit configuration, the driving circuit 3
The charging of the capacitor 37 can be performed as in the case of
It is. Comparing this path with the drive circuit 3, the drive circuit
In the case of 3A, it is directly connected to one output terminal of the full-wave rectifier circuit 32.
The only circuit element connected in contact is the resistance element 382.
You. This full-wave rectifier circuit 32 is directly connected to one output terminal.
Circuit elements are affected by the mains voltage.
Therefore, expensive circuit elements with high withstand voltage and therefore expensive
It needs to be used. In the case of the driving circuit 3A
The circuit elements that require this high withstand voltage are
In terms of position, it is sufficient to use only one resistor element 382
It is possible. [0062] According to the present invention, the above-mentioned problems are solved.
By adopting the configuration described in the section for
Photocouple of the control circuit of the hybrid switch
During the period when the switch is turned off.
The voltage between the input and output terminals of the switch
The hybrid switch
When closing the main contact of an electromagnetic contactor
Even if an impedance occurs, generation of an arc can be suppressed.
This improves long-term reliability of hybrid switches
This has the effect that it becomes possible to

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a circuit diagram showing a hybrid switch according to the present invention in a partial block together with peripheral devices. FIG. 2 is a partial block diagram of a control circuit and a semiconductor switch element pair shown in FIG. FIG. 3 is a circuit diagram of a hybrid switch according to an embodiment of the present invention, which is shown partially omitted. FIG. 4 is a circuit diagram showing a main part of a control circuit provided in a hybrid switch according to an embodiment of the present invention together with peripheral devices. FIG. 5 is a circuit diagram showing a main part of a control circuit provided in the hybrid switch according to the present invention together with peripheral devices. FIG. 5 is a circuit diagram showing a hybrid switch of a conventional example partially blocked together with peripheral devices. FIG. 6 is shown in FIG. FIG. 7 is a circuit diagram in which a control circuit and a semiconductor switch element pair are partially formed and partially omitted. FIG. 7 shows a normal state of the hybrid switch shown in FIG. 5 and FIG. FIG. 8 is a waveform diagram of a main part for explaining the operation of the hybrid switch shown in FIGS. 5 and 6 at the time of an abnormality. FIG. 8A is an auxiliary contact. FIG. 6 is a waveform diagram when a contact failure occurs in FIG.
(B) is a waveform diagram when a contact failure occurs at the main contact. [Description of References] 1 Hybrid switch 2 Control circuit 3 Power supply circuit 31 Rectification / smoothing circuit 82 Voltage stabilization circuit 91 Operation power supply 92 Switch Vc Operation voltage

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁷ , DB name) H01H 47/00 H01H 47/32

Claims (1)

(57) [Claim 1] An electromagnetic contactor having a main contact, an auxiliary contact, an operating coil for causing the main contact and the auxiliary contact to perform an opening / closing operation, and a main contact of the electromagnetic contactor A main semiconductor switch element pair electrically connected in parallel to each other, and a drive signal for turning on the main semiconductor switch element pair for a time during which the main contact of the electromagnetic contactor performs the opening and closing operations. A main semiconductor switch element pair is configured by semiconductor switch elements electrically connected in anti-parallel to each other, and the control circuit is configured to operate at least an operation of the electromagnetic contactor. A signal corresponding to the application timing of the operating voltage applied to the coil is input, and the signal corresponding to the application timing and the opening and closing timer of the auxiliary contact of the electromagnetic contactor are input. A hybrid switch for generating a drive signal to be applied to the main semiconductor switch element based on a signal corresponding to the timing, comprising a control circuit, and a control electrode provided in the main semiconductor switch element forming the main semiconductor switch element pair. The drive circuit section that outputs a drive signal toward the semiconductor device includes a resistance element connected between a cathode and a control electrode of each of the semiconductor switch elements forming the main semiconductor switch element pair, and an electrical parallel connection with the resistance element. And a diode connected so that a cathode is arranged on the control electrode side, a rectifier circuit portion having an input terminal connected through a resistor between the cathode side of each diode, and a DC An auxiliary semiconductor switch element connected between the output terminals and a capacitor connected at least via a resistance element between the DC output terminals of the rectifier circuit unit. A phototransistor connected between the capacitor and a control electrode of the capacitor and the auxiliary semiconductor switching element; and a light-emitting element that provides a conduction signal to the phototransistor with light, wherein the light-emitting element is generated in a control circuit. A hybrid switch which emits light for a conduction signal in response to a signal corresponding to a drive signal applied to a main semiconductor switch element.