JPH09101336A - Driver for controller - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a driver for controller which enables judging of troubles of drive element and controller only with a current sensor. SOLUTION: A drive element 1 is connected in series to a controller 7 and the controller 7 is ON-OFF driven. A first current sensor 2 is connected in series to the controller 7 and detects a current I1 flowing through the controller 7 to output a first current detection signal S1. A second current sensor 3 is connected in parallel to a series circuit of the first current sensor 2 and the controller 7 and detects a fine current I2 according to an applied voltage V1 of the controller 7 to output a second current detection signal S2. A judgement circuit 4 supplies a drive signal S3 to the drive element 1 and judges whether or not the drive element 1 and the controller 7 have a trouble by the logic of the drive signal S1, the first current detection signal S2 and a second current detection signal S3.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a drive device for control equipment.

[0002]

2. Description of the Related Art For example, in a device requiring high safety such as an electronic interlocking device for train control, a drive device used for driving various control devices such as signal lights is
It has a fail-safe function to control the control device to the safe side when a drive element failure is detected, or a function to configure a standby dual system and switch to a standby system when a drive element failure is detected. . For example, in an electronic interlocking device for train control, disclosed as Japanese Patent Laid-Open No. 4-76467 and Japanese Patent Laid-Open No. 4-70570 as prior arts for determining the presence / absence of a failure of a driving element to ensure high safety. The technology is known.

In the technique disclosed in Japanese Patent Laid-Open No. 4-76467, a voltage sensor connected in parallel to a driving element detects an ON (short circuit) failure and an OFF (break) failure of the driving element, and the voltage sensor drives the driving element. After confirming that is normal, the disconnection of the control device is detected by the current sensor connected in series to the control device.

In this technique, the voltage sensor is connected in parallel to the driving element and is serially connected to the control device. Therefore, when the voltage sensor has a short-circuit fault, a current flows through the control device. Since the current limiting resistor of the voltage sensor is connected to the bypass line of the driving element, the current flowing through the control device is smaller than the sensitivity current of the current sensor. Therefore, when the control device is a signal light, the signal light may light up slightly, and the driver may mistakenly recognize the signal.

In the case of a short circuit failure of a drive element, the current to the control equipment can be cut off by connecting two drive elements in series and turning off a normal drive element. However, the short-circuit failure of the voltage sensor cannot cut off the current to the control device.

In the technique disclosed in Japanese Patent Laid-Open No. 4-70570, after confirming that the current sensor is normal (self-check), the current sensor connected in series with the control device causes an ON failure of the drive element and Off is determined to be a failure. The current sensor includes a current probe, and the drive line and the inspection line are configured to pass through the current probe. The state of the current sensor is judged by the presence or absence of the output of the current probe by controlling the current of the inspection line on / off.

According to such a technique, it is determined that the current sensor is normal, and the control device does not cause a disconnection, so that the ON failure and the OFF failure of the drive element are determined. For this reason, when the control device is disconnected, there is a problem that neither ON failure nor OFF failure of the drive element can be detected.

Further, when the current sensor is self-checked, a test current equivalent to the drive current is passed, so the power consumption of the resistor increases. Since the inspection line is provided in the device for diagnosing a failure, if the power supply voltage is increased to compensate for the voltage drop in the cable wiring, the inspection current increases and the heat generation amount of the resistor further increases. In addition, the drive current and the inspection current become unbalanced, and it is necessary to adjust the sensitivity of the current probe and the resistance value of the resistor.

[0009]

SUMMARY OF THE INVENTION An object of the present invention is to provide a drive device for a control device which can judge a failure of a drive element and a control device only by a current sensor.

Another object of the present invention is to provide a drive device for a control device which does not supply current to the control device even if the current sensor fails.

Another object of the present invention is to provide a drive device for control equipment which can facilitate self-checking of a current sensor.

Another object of the present invention is to provide a drive device for control equipment capable of detecting a short-circuit failure of a drive element acting on the most dangerous side and cutting off the power supply.

[0013]

In order to solve the above-mentioned problems, a drive device for control equipment according to the present invention comprises a drive element,
It includes a first current sensor, a second current sensor, and a determination circuit. The drive element is connected in series to the control device and drives the control device on / off. The first current sensor is connected in series to the control device, detects a current flowing through the control device, and outputs a first current detection signal. The second current sensor is connected in parallel to a series circuit of the first current sensor and the control device, detects a minute current according to an applied voltage of the control device, and outputs a second current detection signal. . The determination circuit supplies a drive signal to the drive element, and determines the presence or absence of a failure in the drive element and the control device based on the logic of the drive signal and the first current detection signal and the second current detection signal. judge.

As described above, the drive element is connected in series to the control device and drives the control device on / off. The first current sensor is connected to the control device in series, detects a current flowing through the control device, and outputs a first current detection signal. As a result, when the drive element is in the ON state, the first current detection signal corresponding to the drive current is obtained, and when the drive element is in the OFF state, the first current detection signal without the drive current is obtained.

The second current sensor is connected in parallel to the series circuit of the first current sensor and the control device, detects a minute current according to the applied voltage of the control device, and outputs a second current detection signal. As a result, when the drive element is in the ON state, the second current detection signal which is a minute current corresponding to the applied voltage of the control device is obtained, and when the drive element is in the OFF state, the second current detection signal without the minute current is obtained. A current detection signal is obtained.

The determination circuit supplies a drive signal to the drive element, and determines the presence or absence of a failure of the drive element and the control device based on the logic of the drive signal and the first current detection signal and the second current detection signal. Therefore, when the drive signal is "on",
When the first current detection signal corresponding to the drive current and the second current detection signal corresponding to the minute current are obtained, it can be determined that the drive element and the control device are normal. When the drive signal is "OFF" and the first current detection signal corresponding to the drive current and the second current detection signal corresponding to the minute current are obtained, it is determined that the drive element is in the short-circuit failure state. it can. If the first current detection signal corresponding to the drive current and the second current detection signal corresponding to the minute current cannot be obtained while the drive signal is in the “on” state, it is determined that the drive element is in the disconnection failure state. it can. When the drive signal is in the "on" state, the second current detection signal corresponding to the minute current is obtained, but when the first current detection signal corresponding to the drive current is not obtained, the control device is in the disconnection failure state. Can be determined to be. Thereby, the failure of the drive element and the control device can be determined only by the current sensor.

Since the control device is connected in series with the drive element and the first current sensor, and the second current sensor is connected in parallel with the series circuit of the first current sensor and the control device, the drive element is turned on. Only in certain cases does current flow through the control device, the first current sensor and the second current sensor. For this reason, even if the first current sensor and the second current sensor fail, it is possible to obtain a control device drive device that does not supply current to the control device.

Other features of the present invention and the effects thereof will be described in more detail with reference to the accompanying drawings.

[0019]

1 is a block diagram showing the configuration of a drive device for control equipment according to the present invention. The drive device for control equipment according to the present invention includes a drive element 1, a first current sensor 2, a second current sensor 3, and a determination circuit 4. In the figure, reference numerals 51 to 53 are connection terminals, 6 is a power source,
Reference numeral 7 is a signal light that serves as a control device. The connection terminal 51 is connected to one end of the power supply 6. The connection terminal 52 is connected to the other end of the power source 6. The connection terminal 53 is connected to one end of the signal lamp 7. The other end of the signal light 7 is connected to the other end of the power supply 6. The power supply 6 is a commercial power supply of 50 Hz or 60 Hz.

The driving element 1 is connected in series to the signal lamp 7 via the connection terminal 53 and drives the signal lamp 7 on / off.
The driving element 1 is a solid state relay (hereinafter SS
Called R. ) And the like.

The first current sensor 2 is connected in series to the signal lamp 7 via the connection terminal 53, and the current I flowing through the signal lamp 7 is I.
1 is detected and the first current detection signal S1 is output. First
The current sensor 2 includes a current detection resistor, a current probe,
It can be configured with a current transformer.

The second current sensor 3 is connected in parallel to the series circuit of the first current sensor 2 and the signal lamp 7, detects the minute current I2 corresponding to the applied voltage V1 of the signal lamp 7, and outputs the second current detection signal. Outputs S2. The detection circuit 31 of the second current sensor 3 includes a current detection resistor, a current probe, a current transformer, and the like.

The determination circuit 4 outputs the drive signal S3 to the drive element 1
To the drive signal S3, the first current detection signal and the second
Whether or not there is a failure in the drive element 1 and the signal lamp 7 is determined based on the logic of the current detection signal S2. The judgment circuit 4 can be composed of a microcomputer.

As described above, the driving element 1 is connected in series to the signal lamp 7 and drives the signal lamp 7 on / off. The first current sensor 2 is connected to the signal lamp 7 in series, detects the current I1 flowing through the signal lamp 7, and outputs the first current detection signal S1. Thus, the first current detection signal S1 corresponding to the drive current I1 is obtained when the drive element 1 is in the ON state, and the first current detection signal S1 corresponding to the absence of the drive current I1 is obtained when the drive element 1 is in the OFF state. The current detection signal S1 is obtained.

The second current sensor 3 is connected in parallel to the series circuit of the first current sensor 2 and the signal lamp 7, detects the minute current I2 corresponding to the applied voltage V1 of the signal lamp 7, and outputs the second current detection signal. Outputs S2. As a result, when the drive element 1 is in the ON state, the second current detection signal S2 that becomes the minute current I2 corresponding to the applied voltage V1 of the signal lamp 7 is obtained,
When the drive element 1 is in the off state, the second current detection signal S2 corresponding to the absence of the minute current I2 is obtained.

The determination circuit 4 sends the drive signal S3 to the drive element 1
The drive signal S3 and the first current detection signal S1 and the second current detection signal S2 are logic to determine whether the drive element 1 and the signal lamp 7 have a failure. Therefore, when the first current detection signal S1 corresponding to the drive current I1 and the second current detection signal S2 corresponding to the minute current I2 are obtained in the state where the drive signal S3 is “on”, the drive element 1 and the signal light 7 can be determined to be normal. Drive signal S3 is "off"
In the state, the first current detection signal S corresponding to the drive current I1
When the second current detection signal S2 corresponding to 1 and the minute current I2 is obtained, it can be determined that the drive element 1 is in the short-circuit failure state. When the drive signal S3 is "ON" and the first current detection signal S1 corresponding to the drive current I1 and the second current detection signal S2 corresponding to the minute current cannot be obtained, the drive element 1 is broken. It can be determined that it is in a state. Drive signal S
When 3 is "ON", the second current detection signal S2 corresponding to the minute current I2 is obtained, but if the first current detection signal S1 corresponding to the drive current I1 is not obtained, the signal lamp 7 It can be determined that there is a disconnection failure condition. Thereby, the failure of the drive element 1 and the signal lamp 7 can be determined only by the current sensor.

Since the signal lamp 7 is connected in series with the driving element 1 and the first current sensor 2, and the second current sensor 3 is connected in parallel with the series circuit of the first current sensor 2 and the signal lamp 7, the driving element is The current flows through the signal lamp 7, the first current sensor 2 and the second current sensor 3 only when 1 is in the ON state. For this reason, even if the first current sensor 2 and the second current sensor 3 fail, it is possible to obtain a control device drive device that does not supply current to the signal lamp 7.

In the example shown in FIG. 1, the first current sensor 2
Is a current transformer, the first winding 21 and the second winding
It has a winding wire 22 and a third winding wire 23. The first winding 21 is connected to the signal lamp 7 in series. The second winding 22 is connected to a series circuit of a test power supply 24 and a diagnostic switch element 25. The inspection power supply 24 may be obtained by transforming the power supply 6, or may be obtained by connecting a resistor to the power supply 6 in series and dividing the power supply voltage. The third winding 23 is the first winding 2
1 outputs the first current detection signal S1 according to the drive current I1 flowing in 1 or the inspection current I3 flowing in the second winding 22. The determination circuit 4 supplies a check signal S4 for turning on / off the diagnostic switch element 25, and determines the quality of the first current sensor 2 based on the presence / absence of the first current detection signal S1 corresponding to the inspection current I3. Therefore, when the check circuit S4 for turning on the diagnostic switch element 25 is supplied to the diagnostic switch element 25, the determination circuit 4 obtains the first current detection signal S1 corresponding to the inspection current I3, when the first current detection signal S1 is obtained. It can be confirmed that the current sensor 2 is normal.
Since the first current sensor 2 is guaranteed to be always in a normal state by the self-check, when the drive signal S3 for turning on the drive element 1 is supplied to the drive element 1,
When the first current detection signal S1 corresponding to the drive current I1 and the second current detection signal S2 corresponding to the minute current I2 are obtained, it can be confirmed that the second current sensor 3 is also normal. Thereby, the first current sensor 2 and the second current sensor 3 can be easily self-checked.

The second current sensor 3 includes a resistor 32.
And the resistor 32 includes the first current sensor 2 and the signal lamp 7.
Is connected in parallel to the series circuit of and a minute current I2 is obtained. Therefore, it is not necessary to increase the switching capacity of the drive element 1, and the power consumption is not increased.

Further, the driving element 1 is composed of two switching elements 11 and 12 connected in series. The determination circuit 4 includes a drive signal S31 for sequentially turning on the switch elements 11 and 12,
Supply S32.

FIG. 2 is a flow chart showing a procedure for diagnosing a failure in the drive device for control equipment according to the present invention. In the figure, the state "1" shows the case where the current detection signal is obtained, and the state "0" shows the state where the current detection signal is not obtained.

First, the determination circuit 4 supplies the drive signal S31 for turning on the first switch element 11 to the first switch element 11. The first current sensor 2 has been confirmed to be normal. Therefore, the first current corresponding to the drive current I1
When the current detection signal S1 of 1 is obtained, it can be determined that the second switch element 12 has a short circuit failure. When the first current detection signal S1 is not obtained but the second current detection signal S2 is obtained, it can be determined that the second current sensor has failed.

Next, the determination circuit 4 supplies the drive signal S32 for turning on the second switch element 12 to the second switch element 12. When the first current detection signal S1 and the second current detection signal S2 are obtained, it is determined that the drive element 1 (the first switch element 11 and the second switch element 12) and the signal lamp 7 are normal. . First current detection signal S
When the first and second current detection signals S2 are not obtained, it is determined that the drive element 1 (the first switch element 11 or the second switch element 12) has a disconnection failure. When the second current detection signal S2 is obtained without the first current detection signal S1 being obtained, it is determined that the signal lamp 7 is disconnected. When the first current detection signal S1 is obtained and the second current detection signal S2 is not obtained, it is determined that the second current sensor has failed.

In the example shown in FIG. 1, the determination circuit 4 supplies the drive signal S3 for sequentially turning off the switch elements.

FIG. 3 is a flow chart showing another failure diagnosis procedure of the drive unit for control equipment according to the present invention.

First, the determination circuit 4 supplies the drive signal S31 for turning off the first switch element 11 to the first switch element 11. The determination circuit 4 determines that the first switch element 11 has a short-circuit fault when the first current detection signal S1 is obtained. When the first current detection signal S1 is not obtained, it is confirmed that the first current sensor 2 is normal, so that the drive element 1 (the first switch element 11 and the second switch element 12) is Judge as normal. First
When the current detection signal S1 of 1 is obtained, it is determined that the first switch element 11 has a short circuit failure.

Next, the determination circuit 4 supplies the drive signal S32 for turning off the first switch element 12 to the first switch element 12. The determination circuit 4 uses the first current detection signal S
When 1 is obtained, the first switch element 11 and the second switch element 11
It is determined that the switch element 12 has a short circuit failure. When the first current detection signal S1 is not obtained, the short circuit failure of the first switch element 11 is confirmed again.

Simultaneous short-circuit faults of the first switch element 11 and the second switch element 12 are very rare. Therefore, the short-circuit fault of the drive element 1 that acts on the most dangerous side is detected in advance, and the first switch is detected. By turning off either the element 11 or the second switch element 12, the power supply to the signal lamp 7 can be cut off.

FIG. 4 is a circuit diagram showing a concrete example of the drive device for control equipment according to the present invention. In the figure, the same reference numerals as those in FIG. 1 indicate the same components.

The detection circuit 31 of the second current sensor 3 includes a Zener diode ZD1, a photocoupler PC, and a pull-up resistor R1. Photo coupler P
C is the light emitting diode D2 and the phototransistor Tr.
And The light emitting diode D2 includes a power source 6 (see FIG.
Light is emitted in the negative half cycle and when the power supply voltage becomes equal to or higher than the Zener voltage of the Zener diode ZD1. The phototransistor Tr is a light emitting diode D.
When 2 emits light, it conducts. Phototransistor Tr
Has an open collector output, and the pull-up resistor R1 is connected to the collector. As a result, when the minute current I2 (see FIG. 1) is flowing, 50 Hz / 60
The Hz on / off signal is obtained as the second current detection signal S2. Further signal processing, 50Hz / 60Hz
When the ON / OFF signal of is obtained, the second current detection signal S2 corresponding to the state "1" may be configured.

The first current sensor 2 has a processing circuit 26. The processing circuit 26 has a filter 261, an amplification circuit 262, and an alternating signal detection circuit 263. The filter 261 is composed of a bandpass filter and is supplied from the second winding 22 at 50 Hz or 6 Hz.
Pass a 0 Hz frequency signal. The amplifier circuit 262 is
The frequency signal that has passed through the filter 261 is amplified. The alternating signal detection circuit 263 judges the amplified frequency signal at a constant level, and outputs the first current detection signal S1. The alternating signal detection circuit 263 can be configured similarly to the detection circuit 31.

FIG. 5 is a block diagram showing another example of the drive device for control equipment according to the present invention. This example shows a case where a standby dual system is configured. In the figure, the same reference numerals as those in FIG. 1 indicate the same components. Contact CHR
1 is conducted when the main control device drive device is operated. The contact CHR2 conducts when the slave control device drive device is operated. When the control device drive device of the main system fails, the contact CHR1 is opened and the contact CHR2 is made conductive to switch to the control device drive device of the slave system. As a result, it is possible to obtain a highly-reliable standby dual drive device for a control device.

[0043]

As described above, according to the present invention, the following effects can be obtained. (A) It is possible to provide a control device drive device that can determine a failure of a drive element and a control device only with a current sensor. (B) It is possible to provide a control device drive device that does not supply current to the control device even when the current sensor fails. (C) It is possible to provide a control device drive device that facilitates self-check of the current sensor. (D) It is possible to provide a drive device for a control device capable of detecting a short-circuit failure of a drive element that acts on the most dangerous side and cutting off the power source.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of a drive device for control equipment according to the present invention.

FIG. 2 is a flowchart showing a failure diagnosis procedure of the control device drive device according to the present invention.

FIG. 3 is a flowchart showing another failure diagnosis procedure of the control device drive device according to the present invention.

FIG. 4 is a circuit diagram showing a specific example of a control device drive device according to the present invention.

FIG. 5 is a block diagram showing another example of the control device drive device according to the present invention.

[Explanation of symbols]

 1 Drive Element 12 1st Switch Element 13 2nd Switch Element 2 1st Current Sensor 21 1st Winding 22 2nd Winding 23 3rd Winding 24 Inspection Power Supply 25 Diagnostic Switching Element 26 Processing Circuit 3 Second current sensor 31 Detection circuit 32 Resistor 4 Judgment circuit 51 to 53 Connection terminal 6 Power supply 7 Control device S1 First current detection signal S2 Second current detection signal S3 Drive signal S4 Check signal I1 Drive current I2 Minute current I3 inspection current

Claims (5)

[Claims] 1. A drive element, a first current sensor, and a second current sensor.
A drive device for a control device including a current sensor and a determination circuit, wherein the drive element is connected in series to the control device to drive the control device on / off, and the first current The sensor is connected in series to the control device, detects a current flowing in the control device, and outputs a first current detection signal, and the second current sensor is the first current sensor and the first current sensor. It is connected in parallel to a series circuit of a control device, detects a minute current according to an applied voltage of the control device, and outputs a second current detection signal, wherein the determination circuit outputs a drive signal to the drive element. A drive device for control equipment, which supplies the drive signal and determines whether or not there is a failure in the drive element and the control equipment based on the logic of the drive signal and the first current detection signal and the second current detection signal. 2. The drive device for control equipment according to claim 1, wherein the first current sensor is a current transformer, and the first winding, the second winding, and the third winding are provided. A second winding, the first winding connected in series to the control device, the second winding
Is connected to a series circuit of an inspection power source and a diagnostic switch element, and the third winding is responsive to the drive current flowing through the first winding or the inspection current flowing through the second winding. The determination circuit supplies a check signal for turning on / off the switch element, and determines whether or not the first current detection signal corresponding to an inspection current is present. A drive device for a control device for determining the quality of a current sensor. 3. The control device drive apparatus according to claim 1, wherein the second current sensor includes a resistor, and the resistor is a series circuit of the first current sensor and the control device. And a drive device for a control device, which is connected in parallel to the device to obtain the minute current. 4. The drive device for control equipment according to claim 1, wherein the drive element is formed of two switch elements connected in series, and the determination circuit is a drive signal for sequentially turning on the switch elements. Drive device for control equipment, which supplies 5. The drive device for control equipment according to claim 4, wherein the determination circuit supplies a drive signal for sequentially turning off the switch elements.