JP3313307B2 - Control device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a control device which starts supply of dangerous goods and enters control processing in accordance with a prescribed sequence when control start is instructed, and in particular, is equivalent to the use of a latching type relay. The present invention relates to a control device capable of realizing an abnormality control process having a fail-safe function.

In a control device such as a combustion control device for controlling the supply of dangerous substances, the supply of dangerous substances is started in accordance with a prescribed sequence. The power supply to the power supply is stopped, and the operation for maintaining the power supply stopped state is started. This operation needs to be realized with high reliability and with a simple configuration.

[0003]

2. Description of the Related Art If the prior art is described according to a combustion control device for controlling the combustion of a boiler or the like, the conventional combustion control device performs an ignition operation according to a prescribed sequence, and a flame is not established by this ignition operation. Is detected, the power supply to the fuel supply valve is stopped by exciting the latching relay, and the power supply stop state is maintained.

[0004] That is, in the conventional combustion control device, when it is detected that the flame is not established in the ignition operation, a current is supplied to the set coil of the latching type relay to invert the contact of the latching type relay, so that the fuel supply valve is operated. Power supply to the latching relay, and then maintain the contact state according to the permanent magnet of the latching relay,
The power supply stop state is maintained.

[0005]

However, since the latching relay uses a mechanical relay, there is a problem that the volume is large and the price is high.

Then, there is a problem that peripheral circuits become complicated. That is, in the case of a one-winding type latching relay, it is necessary to flow currents in opposite directions during set and reset, and a circuit for that purpose must be prepared.
The winding type latching relay has a problem that a peripheral circuit becomes complicated because it is necessary to supply a current to each winding and a circuit for that purpose must be prepared.

In order to solve such a problem, it is conceivable to adopt a configuration in which a capacitor and a comparator are used instead of using a latching type relay. That is, the charge is started at the start of the sequence, and when a normal state is entered, a capacitor that discharges the charge and a comparator that compares the voltage generated by the capacitor with a prescribed reference value are prepared. Take, when the comparator determines that the voltage generated by the capacitor exceeds the specified by not entering the normal state,
The power supply to the fuel supply valve is stopped by inverting the contact of a normal non-latching relay, and thereafter, the power supply stop state is maintained by maintaining the contact state according to the charge of the capacitor It is conceivable to adopt a configuration of doing so.

However, if such a configuration is simply adopted, a new problem arises in that safety cannot be ensured. That is, there is a new problem that an abnormal state cannot be detected when a short-circuit failure of the capacitor occurs and an abnormal state cannot be detected when a failure occurs in the comparator.

The present invention has been made in view of the above circumstances, and has a configuration in which, when control start is instructed, the supply of dangerous goods is started in accordance with a prescribed sequence to start control processing. It is another object of the present invention to provide a new control device capable of realizing abnormality control processing having a fail-safe function equivalent to using a latching relay.

[0010]

FIG. 1 shows the principle configuration of the present invention. In the figure, reference numeral 1 denotes a control device equipped with the present invention, which controls a dangerous substance supply apparatus 2 for controlling the supply of dangerous substances. Is started to enter a prescribed control process.

The control device 1 of the present invention comprises a supply control circuit 10
Activating circuit 11, normal detecting circuit 12, capacitor means 13, first switching means 14, second switching means 15, diode means 16, reset switch 17, first comparing means 18, And second comparing means 19.

The supply control circuit 10 controls the supply of dangerous goods by controlling the dangerous goods supply device 2. The activation circuit 11 outputs a one-pulse activation signal in response to the control start instruction. The normality detection circuit 12 detects whether or not the control state is normal, and outputs a signal indicating the detection.

The capacitor means 13 charges via the resistor R1 and the diode D1. The first switching means 14 is turned on when the normality detection circuit 12 outputs a signal indicating that it is in a normal control state, and discharges the charge of the capacitor means 13 via the resistor R2. Second
The switching means 15 is turned ON when the starting circuit 11 outputs a starting signal, and discharges the charge of the capacitor means 13 via the resistor R3.

The diode means 16 includes the capacitor means 1
When short-circuit failure occurs in 3, the supply of the dangerous substance or the start of the supply is forcibly stopped by notifying the supply control circuit 10 of a prescribed potential (for example, zero potential). The reset switch 17 forcibly turns on the second switching means 15 in response to a manual operation.

The first comparing means 18 includes the capacitor means 1
The power supply to the dangerous goods supply device 2 is stopped when the generated voltage is compared with a prescribed reference value and exceeds the reference value. The second comparison means 19 compares the voltage generated by the capacitor means 13 with a prescribed reference value, and when the voltage exceeds the reference value, controls the supply control circuit 10 to force the supply of dangerous goods. By stopping and controlling the start-up circuit 11, the second switching means 15 is forcibly turned off to cut off the discharge path of the capacitor means 13, and the normal detection circuit 12 is controlled to thereby control the first switching means. 14
Is forcibly turned off to cut off the discharge path of the capacitor means 13.

The control device 1 of the present invention thus configured
Then, according to the start signal of the start circuit 11 output in response to the control start instruction, the capacitor means 13 clears the electric charge by discharging through the second switching means 15, and then starts charging. When the normal detection circuit 12 outputs a signal indicating that it is in a normal control state during this charging, the charge is discharged via the first switching means 14.

On the other hand, if the capacitor means 13 does not output a signal indicating that the normality detection circuit 12 is in a normal control state, it continues charging to generate a large voltage. The comparing means 18 stops the power supply to the dangerous goods supply device 2 and the second comparing means 19
By forcibly stopping the supply of dangerous goods by controlling the supply control circuit 10 and controlling the start-up circuit 11,
Control so as not to discharge the charge of the capacitor means 13;
By controlling the normality detection circuit 12, the capacitor means 1
3 is controlled so as not to be discharged.

In this operation, the capacitor means 13 is connected to the diode 16 when a short circuit occurs.
The supply of the dangerous substance or the start of the supply of the dangerous substance are forcibly stopped by notifying the supply control circuit 10 of the prescribed potential via the control signal.

With such a configuration, even if a failure occurs in the first comparing means 18, the supply of dangerous goods is stopped by operating the second comparing means 19, and the second comparing means 18 is stopped. 19, the supply of dangerous goods is stopped by the operation of the first comparing means 18 and the capacitor means 1 is operated.
Even if a short-circuit failure occurs in 3, the supply of dangerous goods is stopped, thereby ensuring a fail-safe operation.

From now on, according to the control device 1 of the present invention,
Without using a latching type relay, it is possible to realize an abnormality control process having a fail-safe function equivalent to using a latching type relay.

[0021]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below according to an embodiment applied to a combustion control device. FIG. 2 shows an embodiment of the combustion control apparatus 1a provided with the present invention.

As shown in this figure, the combustion control device 1a of the present invention comprises a relay drive circuit 20 / normal combustion detection circuit 21
/ Sequence timer circuit 22 / power supply circuit 23 / lockout memory circuit 24 / frame circuit 25 / start circuit 26
And an internal circuit 30 comprising a reset circuit 27. When the temperature controller 40 is turned on according to the internal circuit 30, an AC power supply 41 is inputted to refer to a detection value of a Cds cell 42 used as a flame sensor. While the fuel valve 4
By controlling 3 / ignition transformer 44 / fan motor 45, combustion is controlled. Here, reference numeral 46 denotes a reset switch.

K3A shown in the figure is a contact point of a relay K3 described later. When the temperature controller 40 is turned on, the AC power supply 41 is connected to the fan motor 45 to start the fan motor 45, and the relay K3A is turned on. When is excited,
Fuel valve 43 / Ignition transformer 44 / Fan motor 45
To shut off the power supply and activate the alarm.

K2A is a normally open contact of a relay K2 described later. When the relay K2 is excited, the ignition transformer 44 is activated by connecting the AC power supply 41 to the ignition transformer 44.

K1A is a contact point of a relay K1 which will be described later. When the relay K1 is not excited, the AC power supply 41 is connected to the a side so that the AC power supply 41 is connected to the internal circuit 30 and the relay K1 is connected. When K1 is energized, the AC power supply 41 is connected to the b side so that the AC power supply 4 is connected.
1 is connected to the internal circuit 30.

FIG. 3 shows an embodiment of the relay drive circuit 20 / normal combustion detection circuit 21 / power supply circuit 23 constituting the internal circuit 30. FIG. 4 shows a frame circuit 25 / start circuit 26 / FIG. 5 shows an embodiment of the reset circuit 27, and FIG.
2 illustrates one embodiment of the lockout memory circuit 24. Here, points a to o shown in FIGS. 2 to 5 indicate the same points.

Next, referring to FIGS. 2 to 5, a relay drive circuit 20, a normal combustion detection circuit 21, a sequence timer circuit 22, a power supply circuit 23, a lockout memory circuit 24, a frame circuit 25, a start circuit 26, and a reset circuit. 27 will be described in detail.

As shown in FIG. 3, the power supply circuit 23 is constituted by a general DC smoothing circuit, and the temperature controller 40 is turned on.
By receiving the AC power from the AC power supply 41,
By converting the DC voltage into a DC voltage, a DC voltage Vcc required by the internal circuit 30 is generated.

On the other hand, as shown in FIG. 4, when the DC voltage Vcc is applied, the starting circuit 26 causes a current to flow when the capacitor 260 rises, whereby the transistor 261 is turned on. , A high level is output. Thereafter, when the steady state is reached and the capacitor 260 stops flowing current, the transistor 26
When 1 is turned off, a high voltage is input to the minus terminal of the comparator 262, and a low level is output.

According to this configuration, when the temperature controller 40 is turned on, the starting circuit 26 operates to output a one-pulse high level. On the other hand, the frame circuit 25 includes a Cds cell 42 and a resistor 25 as shown in FIG.
When the Cds cell 42 detects a flame and reduces its resistance value by providing a converter 251 having an input of a voltage determined by resistance division with 0, this comparator 251
Outputs a high level.

Further, the frame circuit 25 is provided with a DC voltage Vcc.
Is provided, a transistor 253 that starts charging when the charging is completed, and a transistor 253 that turns on when the charging of the capacitor 252 is completed, and stops supplying the charging current to the capacitor 252 when the transistor 251 outputs a high level. A transistor 254 that discharges the capacitor 252 by causing the capacitor 252 to discharge.

According to this configuration, the frame circuit 25
When the Cds cell 42 detects a flame, it outputs a high level, and when a certain period of time has elapsed since the temperature controller 40 was turned on, the transistor 253 is turned on (as described later, thereby energizing the relay K2 to turn on the ignition transformer). 44 is activated), and when the Cds cell 42 detects a flame thereafter, the transistor 253 is turned off.
It works like it does.

On the other hand, the sequence timer circuit 22
As shown in FIG. 7, a capacitor 220 that starts charging when a DC voltage Vcc is applied, a comparator 221 that outputs a low level when a voltage generated by the capacitor 220 becomes equal to or more than a specified value, and a voltage generated by the capacitor 220 exceeds a specified value Output a low level when the
A comparator 222 for discharging 20 and a comparator 2
A transistor 223 is turned off when the transistor 21 outputs a low level, and a transistor 224 is turned on when the transistor 223 is turned off.

Here, when the comparator 222 switches to the low level output, the state is maintained.
This state is reset when the comparator 262 of the activation circuit 26 outputs a high level.

According to this configuration, the sequence timer circuit 22 turns on the transistor 224 when a certain period of time elapses after the temperature controller 40 is turned on (this causes the relay K1 to be excited and the fuel valve 43 to be turned on, as described later). Open), and after a certain time, the transistor 2
An operation is performed so as to turn off the reference numeral 24.

On the other hand, as shown in FIG. 3, when the DC voltage Vcc is applied, the relay drive circuit 20 starts charging the capacitor 200, and when the transistor 224 of the sequence timer circuit 22 turns on, the relay drive circuit 20 charges the capacitor 200. A relay K1 that is excited by electric charges to switch the relay contact K1, a transistor 201 that holds the relay K1 excited when the comparator 251 of the frame circuit 25 outputs a high level, and a transistor that holds the relay K1 that is excited. A transistor 202 that turns on when the transistor 253 turns on, a relay K2 that is excited when the transistor 202 turns on and switches the relay contact K2A, and a transistor that turns on when the transistor 243 of the lockout memory circuit 24 described later turns on 203 and Tran It is energized when the static 203 turns ON, the and a relay K3 switching the relay contacts K3A.

According to this configuration, the relay drive circuit 20
Starts the ignition transformer 44 by switching the relay contact K2A by the ON operation of the transistor 253 of the frame circuit 25 that operates after a certain time has elapsed since the temperature controller 40 was turned ON. Then, the temperature controller 40 is turned on.
Then, the fuel valve 43 is opened by switching the relay contact K1A by the ON operation of the transistor 224 of the sequence timer circuit 22 which operates after a lapse of a predetermined time.
The opening operation of the fuel valve 43 is limited to a specified short time.

The opening operation of the fuel valve 43 is held by the high level output of the comparator 251 of the frame circuit 25 which is output when a flame is detected. Then, by turning on the transistor 245 of the lockout memory circuit 24 described later, the relay contact K3A is switched to operate so as to enter a safe stop.

On the other hand, as shown in FIG. 3, the normal combustion detection circuit 21 outputs a low level signal to the comparator 21 when the point of the relay drive circuit 20 becomes higher than a specified voltage.
0, a transistor 211 that is turned on when the comparator 251 of the frame circuit 25 outputs a high level,
A comparator 212 includes a comparator 212 that outputs a high level when the transistor 211 outputs a low level when the transistor 211 is turned on, and a transistor 213 that is turned on when the comparator 212 outputs a high level.

As described above, when the relay K1 is excited, the relay contact K1A is switched, whereby the current flows through the route indicated by α in FIG. It will be set to voltage. On the other hand, the transistor 22 of the sequence timer circuit 22
If the short-circuit failure occurs in the relay 4 or the transistor 201 in the relay drive circuit 20 short-circuits (indicating a pseudo flame), the capacitor 200 of the relay drive circuit 20 is not charged, so that the relay K1 is not excited and a large resistance is provided. The current flows through the route indicated by β in FIG. 3, and the point at which the current flows is set to a low voltage. Thus, the comparator 210 operates to output a low level when the relay K1 is excited.

Therefore, according to this configuration, the normal combustion detection circuit 21 can detect whether or not the relay K1 has been excited. Using this detection result, the relay K1 is excited and the comparator 251 of the frame circuit 25 is used. Outputs a high level indicating that there is a flame, that is, when the fuel valve 43 is open and a normal combustion state is detected in which a flame is detected, the transistor 213 is turned ON (as described later, the transistor 213 is locked). (The capacitor 240 of the out-memory circuit 24 is discharged).

On the other hand, as shown in FIG. 5, the lockout memory circuit 24 starts charging when the DC voltage Vcc is applied, and discharges when the transistor 213 of the normal combustion detection circuit 21 is turned on. When a short-circuit fault occurs, a capacitor 240 that turns off the transistor 224 of the sequence timer circuit 22 and a low level output when the voltage generated by the capacitor 240 exceeds a specified value
The capacitor 220 of the sequence timer circuit 22 is discharged, and the transistor 213 of the normal combustion detection circuit 21 is turned off.
F, the output of the comparator 262 of the starting circuit 26 is set to a low level, and the capacitor 252 of the frame circuit 25 is set.
, A comparator 242 that outputs a high level when the voltage generated by the capacitor 240 is equal to or higher than a specified value, and a comparator 242 that is turned on when the comparator 242 outputs a high level. The transistor 2 which turns on and sets the output of the comparator 262 of the starting circuit 26 to a low level
43.

According to this configuration, the lockout memory circuit 24 includes the transistor 213 of the normal combustion detection circuit 21.
When a certain period of time has elapsed without turning ON, the comparator 241 outputs a low level, whereby the capacitor 220 of the sequence timer circuit 22 is discharged, the fuel valve 43 is shut off, and the normal combustion detection circuit 21
Of the transistor 213 is forcibly turned off, the discharge path of the capacitor 240 is cut off, and the transistor 262 of the starting circuit 26 forcibly outputs a low level (this causes the transistor 270 of the reset circuit 27 to be output, as described later). The discharge path of the capacitor 240 is cut off because the discharge path of the capacitor 240 is cut off because the switch is not turned on.
2 discharges, the excitation of the relay K2 for starting the ignition transformer 44 is released.

Then, when the comparator 242 outputs a high level, the transistor 243 is turned on, whereby the transistor 203 of the relay drive circuit 20 is turned on.
N, the relay K3 which enters the safety stop is excited,
When the transistor 262 of the starting circuit 26 forcibly outputs a low level, the discharge path of the capacitor 240 is cut off.

On the other hand, as shown in FIG. 4, the reset circuit 27 is turned on when the comparator 262 of the starting circuit 26 outputs a high level, and is turned on when the reset switch 46 is closed. The capacitor 220 of the circuit 22 and the lockout memory circuit 2
4, the transistor 270 that operates to discharge the capacitor 240 of the frame circuit 25, the capacitor 252 of the frame circuit 25, and the capacitor 200 of the relay drive circuit 20.

According to this configuration, reset circuit 27
When the activation circuit 26 outputs a one-pulse high level in response to the ON operation of the temperature controller 40 and when the reset switch 46 is closed in response to a manual operation, the capacitor 220 of the sequence timer circuit 22 , The capacitor 240 of the lockout memory circuit 24, the capacitor 252 of the frame circuit 25, and the capacitor 200 of the relay drive circuit 20.

In the combustion control apparatus 1a according to the present invention thus configured, when a combustion request is issued by turning on the temperature controller 40, the fan motor 45 is started to start pre-purge, and the power supply circuit 23 Generates the DC voltage Vcc required by the internal circuit 30.

In response to the generation of the DC voltage Vcc, the starting circuit 26 outputs a high level in the form of one pulse, and in response thereto, the transistor 270 of the reset circuit 27 is turned on.
By doing so, the capacitor 2 of the sequence timer circuit 22
20 and the capacitor 24 of the lockout memory circuit 24
0, the capacitor 252 of the frame circuit 25, and the capacitor 200 of the relay drive circuit 20 are discharged, and the comparator 222 of the sequence timer circuit 22 is reset to output a high level.

After this initialization process, the capacitor 220 of the sequence timer circuit 22, the capacitor 240 of the lockout memory circuit 24, the capacitor 252 of the frame circuit 25, and the capacitor 200 of the relay drive circuit 20
Starts charging.

In response to the charging process, the frame circuit 25
Turns on the transistor 253 after a lapse of a predetermined time defined by the completion of charging of the capacitor 252, and in response, turns on the transistor 202 of the relay drive circuit 20 to excite the relay K2 and turn on the ignition transformer 44. Is started.

Further, in response to the charging process, the sequence timer circuit 22 outputs a low level to the comparator 221 after a certain period of time defined by the completion of the charging of the capacitor 220, thereby turning on the transistor 224.
In response, the capacitor 200 of the relay drive circuit 20
Flows through the relay K1, the relay K1 is excited, and the fuel valve 43 is opened. Thereafter, the sequence timer circuit 22 turns off the transistor 224 by discharging the capacitor 220 in response to the low level output of the comparator 222, and releases the excitation of the relay K1 by its own circuit.

According to the processing of the frame circuit 25 / sequence timer circuit 22, the ignition transformer 44 is started and the fuel valve 45 is opened to attempt ignition after a lapse of a predetermined time from the start of the pre-purge.

When a flame is established by this ignition operation, the frame circuit 25 outputs a high level to the comparator 251 and, in response to this, turns on the transistor 201 of the relay drive circuit 20 to hold the excitation in the relay K1. The current flows, the excitation of the relay K1 is maintained, and the opening operation of the fuel valve 43 is maintained. Then, the frame circuit 25 turns on the transistor 254 in accordance with the high level output of the comparator 251, thereby turning on the capacitor 2
The ignition transformer 44 is stopped by discharging the 52, thereby releasing the excitation of the relay K2.

The excitation of the relay K1 and the frame circuit 2
In response to the processing of No. 5, the normal combustion detection circuit 21 detects that the flame has been detected while the relay K1 has been excited.
When the comparator 251 of the frame circuit 25 outputs a high level, it is determined that the combustion state is normal, and the transistor 213 is turned on.

On the other hand, the lockout memory circuit 24 continues the discharging process by the starting circuit 26 and
Start charging. This charging is performed by the normal combustion detection circuit 21.
When the transistor 213 is turned on, it stops. That is, when it is detected that the combustion state is normal, the operation is stopped.

Here, when the capacitor 240 is short-circuited, the transistor 224 of the sequence timer circuit 22 is forcibly turned off.
The fuel valve 43 does not open.

The lockout memory circuit 24
When the transistor 213 of the normal combustion detection circuit 21 is not turned on, the charging of the capacitor 240 is continued. When the charged amount reaches a specified value, a low level is output to the comparator 241.

Upon receiving the low level output of the comparator 241, the capacitor 22 of the sequence timer circuit 22
0 is forcibly discharged, whereby the fuel valve 43 is forcibly closed. Further, the transistor 213 of the normal combustion detection circuit 21 is forcibly turned off, whereby the discharge path of the capacitor 240 is forcibly cut off. Also,
The comparator 262 of the starting circuit 26 is set to forcibly output a low level.
Is forcedly stopped, and the discharge path is forcibly cut off. Further, the capacitor 252 of the frame circuit 25 is forcibly discharged, whereby the activation of the ignition transformer 44 is forcibly stopped.

Further, when the charge amount of the capacitor 240 reaches a specified value because the transistor 213 of the normal combustion detection circuit 21 does not turn on, the lockout memory circuit 24 outputs a high level to the comparator 242 so that the transistor 243 Turn ON.

In response to the ON operation of the transistor 243, the transistor K3 of the relay drive circuit 20 is turned ON to excite the relay K3, thereby supplying power to the fuel valve 43 / ignition transformer 44 / fan motor 45. At the same time, the alarm device is activated. In addition, the comparator 262 of the starting circuit 26 is set to forcibly output a low level, whereby the discharging process of the capacitor 240 by the starting circuit 26 is forcibly stopped, and the discharging path is forcibly cut off.

As described above, the combustion control device 1 of the present invention
As shown in FIG. 6, when the temperature controller 40 is turned on, a pre-purge is performed by activating the fan motor 45, and after a lapse of a specified time, the ignition transformer 44 is started to enter an ignition trial, thereby setting the ignition trial. The ignition is attempted by opening the fuel valve 43 after performing the preignition of time. When the ignition is confirmed by the Cds cell 42, the opening operation of the fuel valve 43 is maintained, the post-ignition is performed for a specified time, and then the ignition transformer 44 is stopped.

In this combustion control sequence, even if an ignition trial is performed for a specified time, the Cds cell 4
2 does not detect the flame, the lockout memory circuit 24 operates and, as shown in FIG.
/ Ignition transformer 44 / Fan motor 45 is stopped to activate the alarm device. Then, when the reset switch 46 is operated, the normal combustion control sequence is executed again.

In the combustion control sequence,
When a pseudo flame is generated, the charging of the capacitor 252 is stopped by turning on the transistor 254 of the frame circuit 25, thereby preventing the ignition transformer from being activated, and turning on the transistor 201 of the relay driving circuit 20 to turn on the capacitor. By discharging 200, the excitation of the relay K1 is stopped so that the fuel valve 43 is not opened. Then, as shown in FIG. 8, when the specified time elapses in this state, the lockout memory circuit 24 operates, the fan motor 45 also stops, and the alarm device is activated. Then, when the reset switch 46 is operated, the normal combustion control sequence is executed again.

As described above, the combustion control device 1 of the present invention
In the case of a, when it does not ignite or when a pseudo flame occurs,
Fuel valve 43 / Ignition transformer 44 / Fan motor 45
By stopping the power supply to the system, the vehicle will be safely stopped.

Next, the lockout memory circuit 24 which is the gist of the present invention will be described in more detail. The lockout memory circuit 24 includes, as shown in FIG.
40, a comparator 241 provided on the input side, and a comparator 242 provided on the output side.

The capacitor 240 discharges when the starting circuit 26 outputs a high level in the form of one pulse, and thereafter starts charging, and detects that the normal combustion detection circuit 31 enters a normal combustion state. When you do, discharge. Therefore, when the normal combustion is not started, the operation is performed so as to generate a large voltage by continuing the charging.

Further, when a short circuit occurs, the capacitor 240 controls the transistor 224 of the sequence timer circuit 22 to be forcibly turned off, so that the fuel valve 43 is not opened.

On the other hand, the comparator 2 provided on the input side
41 outputs a low level when the voltage generated by the capacitor 240 becomes equal to or higher than a specified value. That is, when normal combustion is not started, a low level is output.

By this low level output, the capacitor 220 of the sequence timer circuit 22 is forcibly discharged,
Thereby, the fuel valve 43 is forcibly closed, thereby realizing a safe operation.

Since this safe operation is realized by the electric charge held by the capacitor 240, it is necessary to avoid the discharge of the capacitor 240. This is realized as follows.

That is, the low level output of the comparator 241 makes the transistor 2 of the normal combustion detection circuit 21
13 is forcibly turned off, whereby the capacitor 24
0 is forcibly cut off, and the comparator 262 of the start-up circuit 26 is set to forcibly output a low level, thereby forcibly stopping the discharging process of the capacitor 240. Have been.

Further, in order to enhance safety, the low level output of the comparator 241 forcibly discharges the capacitor 252 of the frame circuit 25, thereby forcibly stopping the activation of the ignition transformer 44. .

On the other hand, the comparator 2 provided on the output side
42 outputs a high level when the voltage generated by the capacitor 240 exceeds a specified level. That is, when normal combustion is not started, a high level is output.

The high-level output turns on the transistor 203 of the relay drive circuit 20 to excite the relay K3, thereby cutting off the power supply to the fuel valve 43 / ignition transformer 44 / fan motor 45. Thus, a safe operation is realized.

Further, in order to enhance the safety, the high level output of the comparator 242 makes the transistor 243
Is turned on, the capacitor 25 of the frame circuit 25 is turned on.
2 is forcibly discharged, whereby the activation of the ignition transformer 44 is forcibly stopped.

With this configuration, even if a failure occurs in the comparator 241 provided on the input side, the fuel valve 43 is forcibly closed by operating the comparator 242 provided on the output side, and Even if a failure occurs in the comparator 242 provided on the input side, the fuel valve 43 is forcibly closed by the operation of the comparator 241 provided on the input side. Is forcibly closed to ensure a fail-safe operation.

The locked state at the time of the abnormality is released by discharging the capacitor 240 when the reset switch 46 is manually operated. Although the present invention has been described with reference to the illustrated embodiments, the present invention is not limited thereto. For example, in the embodiments, the present invention has been described according to the application example to the combustion control device, but the present invention is not limited to the application to the combustion control device.

[0078]

As described above, according to the present invention, when the control start is instructed, the supply of dangerous goods is started in accordance with a prescribed sequence, and the control process is started. Capacitor means which starts charging in response to the instruction and discharges when entering a normal state, and two comparing means for monitoring the voltage generated by the capacitor means are provided, and the abnormal state is detected by the comparing means. Occasionally, one comparing means stops the supply of power to the dangerous substance supply device, and the other comparing means stops the supply of dangerous substances by controlling the dangerous substance supply circuit and cuts off the discharge path of the capacitor. It adopts the configuration to do.

As described above, the processing for detecting the abnormal state is duplicated, and the supply of the hazardous material is stopped according to the different methods. The supply of goods can be reliably stopped.

Thus, according to the present invention, when the control start is instructed, the supply of dangerous goods is started in accordance with a prescribed sequence and the control process is started. Thus, it is possible to realize an abnormality control process having a fail-safe function equivalent to using a latching relay.

[Brief description of the drawings]

FIG. 1 is a principle configuration diagram of the present invention.

FIG. 2 is an embodiment of the present invention.

FIG. 3 is an embodiment of an internal circuit.

FIG. 4 is an embodiment of an internal circuit.

FIG. 5 is an embodiment of an internal circuit.

FIG. 6 is a time chart of the present invention.

FIG. 7 is a time chart of the present invention.

FIG. 8 is a time chart of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Control apparatus 2 Dangerous goods supply apparatus 10 Supply control circuit 11 Starting circuit 12 Normal detection circuit 13 Capacitor means 14 First switching means 15 Second switching means 16 Diode means 17 Reset switch 18 First comparison means 19 Second Comparison means

──────────────────────────────────────────────────続 き Continuation of front page (58) Field surveyed (Int. Cl. ⁷ , DB name) H02J 1/00 G05B 9/02

Claims (3)

(57) [Claims] When a control start is instructed, a control device which starts supply of dangerous goods and enters a control process in accordance with a prescribed sequence, starts charging in response to the control start instruction, and performs normal control. Capacitor means for discharging the electric charge when it is confirmed that the operation is started, and further forcibly stopping the supply of dangerous substances or the start of the supply thereof in the case of a short-circuit failure; A first comparing means for stopping the supply of power to the dangerous goods supply device when the reference value is exceeded, and a voltage generated by the capacitor means being compared with a prescribed reference value. And a second comparing means for forcibly stopping the supply of the dangerous substance when the value exceeds the value and for interrupting a discharge path of the capacitor means. 2. A starter circuit for issuing a control start instruction, a normality detection circuit for generating a signal indicating whether or not a normal control operation has been started, and a supply control circuit for controlling a dangerous substance supply device. By controlling the dangerous goods supply device in accordance with the prescribed sequence, the control device starts supplying dangerous goods and enters control processing, discharges the charge in response to the instruction of the starting circuit, and then charges the charge. Is started, and when it is confirmed that the normal control operation is started according to the detection signal of the normality detection circuit, the electric charge is discharged. Further, when a short circuit occurs, the supply control circuit is notified of a specified potential. Thus, a capacitor means for forcibly stopping the supply of the dangerous substance or the start of the supply is compared with a specified reference value, and when the voltage exceeds the reference value, the dangerous substance supply device A first comparing means for stopping the supply of power to the power supply, and comparing the voltage generated by the capacitor means with a prescribed reference value, and controlling the supply control circuit when the voltage exceeds the reference value, whereby the supply of dangerous substances is performed. By forcibly stopping and controlling the start-up circuit, the discharge process of the capacitor means executed by the start-up circuit is forcibly stopped to cut off the discharge path, and the normality detection circuit is controlled, so that the normality is controlled. And a second comparing means for forcibly stopping the discharge process of the capacitor means executed by the detection circuit and interrupting the discharge path. 3. The control device according to claim 1, further comprising reset circuit means for forcibly discharging the electric charge of the capacitor means in response to a manual operation.