KR100776996B1 - A Power Control Apparatus with an Enforced Turning-off Function - Google Patents

Abstract

Disclosed is a power control device with a forced interruption function suitable for preventing the control target from being continuously driven in an abnormal state of a processor due to a congestion of program loads.

In the power control device of the forced cut-off function, when a user inputs a forced cut-off command using a key switch, the forced cut-off control part responds to the key switch instead of the switching control signal applied from the processor to the control terminal of the control switch. A forced interruption signal is applied to the control terminal of the control switch.

Accordingly, an accident such as a damage, a fire, and a burn of the control target device caused by the processor not controlling the control switch at an appropriate time point is prevented. In addition, the power control device of the forced shut-off function can protect the user from the risk of a sudden accident.

Control Switches, Memory Devices, Processors, Switch Drivers

Description

A Power Control Apparatus with an Enforced Turning-off Function}

BRIEF DESCRIPTION OF THE DRAWINGS In order to provide a more sufficient understanding of the drawings to be used in the detailed description of the invention, a brief description of each drawing is provided.

1 is a circuit diagram of a conventional power supply control apparatus.

2 is a circuit diagram illustrating a power control device of a forced shut-off function according to an embodiment of the present invention.

FIG. 3 is a detailed circuit diagram illustrating the forced cutoff control unit shown in FIG. 2 in detail.

FIG. 4 is a flowchart showing the operation procedure of the power control device of the forced shut-off function shown in FIG.

`` Explanation of symbols for main parts of drawings ''

10, 110: control switch 20, 120: processor

130: key switch 140: forced block control

142: filter 144: reference voltage setting section

146: comparator 148: flip-flop

150: priority output unit

30, 160, 170: switch driver

The present invention relates to a power supply control device for controlling whether or not to supply the power to be controlled, and more particularly, to a power control device for controlling the power to be controlled using a processor.

The normal power control device controls the power to be supplied to the control target. The power supply control device includes a control switch for switching the power and a control logic for controlling the switching operation of the control switch. In the conventional control logic, PLA (Programmable Logic Array) is mainly used, but PLA has a disadvantage that the design must be re-produced according to the control environment or conditions. In order to solve the disadvantage of PLA, a method using software has been proposed, and an implementation method using software requires a processor.

Since the processor implements the control logic by operating the software, there is an advantage that can be easily applied by changing the software when there is a change in the control environment or conditions. On the other hand, the processor has a disadvantage in that it is difficult to control the control switch in the congestion situation of the program load in which the amount of the program increases rapidly. This problem will be more clearly revealed through a power supply control apparatus using a processor as shown in FIG. 1.

The conventional power supply control device of FIG. 1 includes a switch driver 30 and a processor 20 connected in series with a relay 10. 1, there are not shown components that are not directly related to the present invention and may confuse or confuse the gist of the present invention, those skilled in the art will include the problem and technical solutions according to the description only It will be clearly understood the technical scope and spirit of the present invention.

The relay 10 causes the commercial AC power to be supplied to the control target in response to the signal of the switch driver 30, or switches the commercial AC power so as not to be supplied.

The processor 20 generates a switching control signal PCS for controlling the switching operation of the relay 10.

When the switching control signal PCS is 'high', the switch driver 30 forms a current path of the relay driving voltage Vry via the induction coil L1 of the relay 10, thereby reducing the control switch 10. Make the switch movable piece (SW1) turn on. On the contrary, if the switching control signal PCS is 'low', the switch driver 30 opens the current path of the relay driving voltage Vry via the induction coil L1 of the control switch 10, thereby switching the switch. Let (SW1) turn off.

In the power control device for controlling the control switch 10 using the processor 30 as described above, the processor 30 when the amount of programs to be processed by the processor 30 increases rapidly, that is, when the program load is congested. An abnormal state occurs and it is difficult to transition the logical state of the switching control signal PCS applied to the control switch 10 at an appropriate time. As a result, the control switch 10 is continuously turned on, and as a result, commercial AC power is continuously supplied to the control target. In this case, continuous driving of the control object may cause damage to the controlled device, as well as accidents involving the user such as thermal destruction of the processor, fire, and burns.

Accordingly, an object of the present invention is to provide a power control device having a forced cut-off function suitable for forcibly blocking a control object by a user's designation in an abnormal state caused by an increase in program load of a processor.

The power control device of the forced cut-off function according to an embodiment of the present invention for achieving the above object is a control switch for switching the control target power supply, a processor for controlling the switching operation of the control switch, and when an abnormal state of the processor occurs A forced shut-off control unit for controlling the control switch to be opened by using a key switch for inputting a forced shut-off command, a memory element that receives and stores a forced shut-off command from the key switch and generates and stores a forced shut-off signal; When the forced cutoff signal is included in the forced cutoff signal among the switching control signal and the forced cutoff signal from the forced cutoff control part, the priority cutout is configured to apply the forced cutoff signal to the control switch preferentially.

The switching control signal from the processor and the forced cutoff signal from the forced cutoff control part are TTL (transistor transistor logic) voltages, while the driving voltage of the control switch is a DC voltage higher than the TTL voltage and is connected between the processor and the priority output part. A first switch driver which shifts the switching control signal from the processor to the voltage level of the control switch driving voltage, and is connected between the forced cutoff control unit and the priority output unit to convert the forced cutoff signal of the forced cutoff control unit to the voltage of the control switch drive voltage; It may further include a second switch driver for shifting to the level.

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The memory element is preferably reset (initialized) by the processor.

The forced cutoff control unit compares the filter for removing the noise of the high frequency component included in the forced cutoff command of the key switch, the reference voltage setting unit for setting the reference voltage, and the forced cutoff command from the filter and the reference voltage. And a comparator for determining the storage time of the memory device.

The priority output unit includes a one-way element that transmits the forced cutoff signal of the forced cutoff control unit to the control terminal of the control switch, and a resistor connected between the processor and the control terminal of the control switch.

In accordance with another aspect of the present invention, a power control device having a forced cut-off function includes a first control switch for switching a control target power supply, a processor for controlling a switching operation of a control switch, and a processor and a first control switch. The second control switch uses a second control switch, a key switch for inputting a forced shutoff command when an abnormal state of the processor occurs, and a memory device that receives and stores a forced shutoff command from the key switch and generates a forced shutoff signal. It is configured to include a forced shutoff control unit for opening the switch.

The switching control signal from the processor is a TTL voltage, while the driving voltage of the control switch is a DC voltage higher than the TTL voltage, and is connected to either one of the processor and the second control switch and between the first and second control switches, thereby It may further include a switch driver for shifting the switching control signal of to the voltage level of the first control switch driving voltage.

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The memory element is preferably reset by the processor.

The forced cut-off control unit compares the filter circuit for removing noise of the high frequency component included in the forced cut-off command of the key switch, the reference voltage setting unit for setting the reference voltage, the forced cut-off command from the filter and the reference voltage. And a comparator for determining the storage time of the memory device.

With the above configuration, the power control device of the forced cut-off function according to the present invention can forcibly cut the power to be controlled by the user's designation even in an abnormal state of the processor due to the congestion of the program load. As a result, the control switch is forcibly cut off to prevent an accident due to continuous operation of the control object.

Other objects, other features, and other advantages of the present invention in addition to the object of the present invention as described above will become apparent from the description of the preferred embodiment of the present invention with reference to the accompanying drawings.

Hereinafter, the power control device of the forced shut-off function according to a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

2 is a circuit diagram illustrating a power control device provided with a forced shut-off function according to a preferred embodiment of the present invention. The power control apparatus of FIG. 2 includes a processor 120 connectable with the relay 110. The relay 110 switches the commercial AC power supplied to the control target. The relay 110 performing this operation may be replaced by a control switch such as a triac, a thyristor, a silicon controlled rectifier (SCR), a semiconductor relay (SR), or the like.

The processor 120 generates a switching control signal PCS for controlling the switching operation of the relay 110. When the switching control signal PCS is 'high', the relay 110 is turned on to allow commercial AC power to be supplied to the control target. On the contrary, when the switching control signal PCS is 'low', the relay 110 is turned off to cut off the commercial AC power supplied to the control target.

The power supply control apparatus includes a key switch 130, a priority output unit 150 connected between the relay 110 and the processor 120, and between the priority output unit 150 and the key switch 130. It is provided with a forced interruption control unit 140 connected to.

The key switch 130 inputs a forced interruption command KS designated by the user by the user's manipulation. The first resistor R11 and the first capacitor C11 connected in parallel between the key switch 130 and the ground voltage line GND remove noise of the high frequency component included in the forced interruption command KS. The force blocking command KS is also applied to the key-in port 120A of the processor 120. The processor 120 receiving the forced cutoff command KS from the key switch 130 should shift the switching control signal PCS to a 'low' logic signal. However, when the program load is congested, the logic value of the switching control signal is changed. It cannot be changed.

The forced blocking control unit 140 stores and maintains the forced blocking command KS from the key switch 130 and outputs the forced blocking signal KFS. The forced blocking signal KFS is a specific logic (ie, 'high') from when the forced blocking command KS is input until the reset signal RES from the processor 120 is applied to the forced blocking control unit 140. Will be maintained.

The priority output unit 150 supplies the switching control signal PCS from the processor 120 to the induction coil L11 of the relay 110 in the normal driving state of the processor 120. If the forced blocking signal KFS from the forced blocking control unit 140 includes a forced blocking command KS, that is, if the forced blocking signal KFS is a specific logical value (for example, 'high'), The level output unit 150 supplies a forced cutoff signal KFS to the induction coil L11 of the relay 110. To this end, the priority output unit 150 is connected between the induction coil L11 of the relay 110 and the processor 120 to limit the current, and the fifth resistor R15 and the relay 110. The first diode D11 is connected between the output terminals of the forced interruption control unit 140. The first diode D11 transmits the forced blocking signal KFS of the forced blocking control unit 140 to the relay 110 and prevents the noise of the relay 130 from affecting the forced blocking control unit 140. Serves as a directional element.

In the power control device of the forced shutoff function according to an embodiment of the present invention, the priority output unit 150 may be replaced by a second relay. In case of being replaced by the second relay, when the forced cutoff signal KFS has a base logic value (that is, when there is no forced cutoff command KS), the switching control signal PCS generated by the processor 120 is removed. It may be transmitted toward the induction coil L11 of the relay 110 through two relays. If the forced blocking signal KFS from the forced blocking control unit 140 is a specific logic value (that is, including the forced blocking command KS), the second relay is switched from the processor 120 to the relay 110. Block the control signal PCS. As a result, the driving of the control object can be interrupted.

The power controller of FIG. 2 includes a first switch driver 160 connected between a priority output unit 150 and a processor 120, and a priority output unit 150 and a forced shutoff control unit 140. The second switch driver 170 may be further provided. The switching control signal PCS from the processor 20 and the forced cutoff signal KFS from the forced cutoff control unit 140 are TTL (Transistor Transistor Logic) voltages. On the other hand, the driving voltage Vry for driving the induction coil L11 of the relay 110 is a DC voltage higher than the TTL voltage. As such, the first and second switch drivers 160 and 170 may be level shifters to match components having different voltage ranges, that is, the first relay 110, the processor 120, and the forced cutoff controller 140. Use as.

The first switch driver 160 is connected between the induction coil L11 of the relay 110 and the processor 120 to shift the switching control signal PCS to the voltage level of the relay driving voltage Vry. The first switch driver 160 includes a first transistor Q11 to which a base terminal is connected to the processor 120, a sixth resistor R16 connected between the base terminal and the processor, and a base terminal and an emitter terminal. And a seventh resistor R17 connected to the ground voltage line GND. If the switching control signal PCS from the processor 120 is 'high' logic, the first transistor Q11 is turned on and passes through the induction coil L11, the collector and the emitter of the relay 110. By forming a current path of the relay driving voltage Vry reaching the low voltage line GND, the switch movable piece SW1 of the relay 110 is turned on. As a result, commercial AC power is supplied to the control target to drive the control target. On the other hand, if the switching control signal PCS from the processor 120 is a 'low' logic signal, the first transistor Q11 is turned off so that the switch movable piece SW11 of the relay 110 is opened. Causes the drive to stop.

The second switch driver 170 is connected between the forced cutoff control unit 140 and the induction coil L11 of the relay 110 and relays the forced cutoff signal KFS of the forced cutoff control unit 140 to the relay drive voltage Vry. Shift to the voltage level. The second switch driver 170 has a collector terminal connected to a second transistor Q12 having a base terminal connected to an output terminal of the forced shutoff control unit 140, and a collector terminal of a second transistor Q12. Is composed of a third transistor Q13 connected to the induction coil L11 of the relay 110. In addition, a DC voltage equal to the relay driving voltage Vry is applied to the third transistor Q13. The emitter terminal of the second transistor Q12 is grounded to the ground voltage line GND. In addition, the second switch driver 170 includes an eighth resistor R18 and a tenth resistor R20 for limiting current, and a ninth resistor R19 and an eleventh resistor R21 for applying a bias voltage. When the forced blocking signal KFS from the forced blocking control unit 140 is 'high' logic, the second transistor Q12 is turned on, thereby turning on the third transistor Q13. Accordingly, the forced shutoff signal VKFS of the same voltage level as the relay driving voltage Vry is applied to the emitter terminal of the third transistor Q13, so that the switch movable piece SW11 of the relay 110 is turned off. To be.

In the power supply control apparatus according to the embodiment of the present invention, when the priority output unit 150 is replaced by the second relay, the forced shutoff signal KFS serves as a control signal of the second relay, so that the second switch driver 170 may be removed.

3 is a detailed circuit diagram illustrating the forced shutoff control unit 140 in detail in the power control device of the forced shutoff function. In FIG. 3, the forced cutoff control unit 140 includes a filter 142, a reference voltage setting unit 144, and a comparator 146.

The filter 142 removes noise of the high frequency component included in the forced cutoff command KS from the key switch 130 (FKS). The filter 142 may include a second resistor C12 connected between the input terminal N1 and the second node N2, and a second capacitor C12 connected between the second node N2 and the base voltage line GND. It is composed of

The reference voltage setting unit 144 receives the same DC driving voltage Vcc as the DC power applied to the key switch 130 and sets the reference voltage Vref. The DC driving voltage Vcc supplied to the reference voltage setting unit 144 is divided by the third resistor R13 and the fourth resistor R14 connected in series with the reference node Nref, and the reference node Nref. ) Is set a reference voltage Vref.

The comparator 146 compares the forced interruption command FKS from which the noise of the high frequency component is removed from the filter with the reference voltage Vref. The non-inverting terminal (+) of the comparator 146 is supplied with a forced interruption command (FKS) from which the noise of the high frequency component is removed from the filter 142, and the reference terminal set by the reference voltage setting unit 144 is input to the inverting terminal (-). The voltage Vref is input. As described above, the comparator 146 compares the reference voltage Vref with the forced cutoff command FKS and outputs a 'high' logic signal when the forced cutoff command FKS is higher than the reference voltage Vref.

In addition, the forced blocking control unit 140 includes a flip-flop 148. The flip-flop 148 receives the forced blocking command KS from the key switch 130, stores and holds the forced blocking command KS, and outputs the forced blocking signal KFS. The flip-flop 148 receives a forced blocking command KS from the key switch 130 through the data terminal D, and receives a signal output from the comparator 146 through the clock terminal CLK. . Accordingly, the flip-flop 148 latches the forced blocking command KS on the data terminal D at the rising edge of the 'high' logic signal, that is, at the rising edge of the clock terminal CLK. As a result, a forced blocking signal KFS having the same logic (that is, 'high' logic) as the forced blocking command KS is generated at the output terminal Q of the flip-flop 148. This forced shutoff signal KFS causes the switch movable piece SW11 of the relay 110 to be turned off.

The flip-flop 148 receives the 'low' logic reset signal RES from the clear port 120B of the processor 120 when the processor 120 is normalized or when the driving voltage is supplied for the first time. The reset signal RES is input to the clear port / CLR of the flip-flop 148 to reset 'high' on the output terminal Q of the flip-flop 148 to 'low'. The flip-flop 148 performing this operation may be replaced with another flip-flop or latch belonging to the memory device.

4 is a flowchart showing the operation procedure of the power control device of the forced shut-off function.

In step S10, when the power is turned on (when the initial driving power is supplied), the processor 120 outputs a reset signal RES for initializing the system. Accordingly, the forced blocking control unit 130 initializes the forced blocking signal KFS to a base logic value (that is, a 'low' logic value) by the reset signal RES from the processor 120. Subsequently, the switching value of the switching control signal PCS from the processor 120 is changed to 'high' and 'low' as necessary to control the switching operation of the relay 110 (step S12). At this time, the relay 110 allows the commercial AC power to be supplied or cut off according to the logic value of the switching control signal PCS generated by the processor 120. This switching control operation (step S12) is performed until the forced shut-off command KS is input from the user through the key switch 130 (when the user presses the key switch 130 by judging occurrence of an abnormal state). (Step S14). If there is a forced blocking command KS, the forced blocking control unit 140 responding to the key switch 130 continuously generates the forced blocking signal KFS having a specific logic value (that is, 'high') and the signal is generated. By allowing the relay 110 to be applied instead of the switching control signal PCS, the commercial AC power supplied to the control target is cut off (step S16).

As described above, the power control device of the forced cut-off function according to the preferred embodiment of the present invention, the power supplied to the control switch is cut off by using the forced cut-off command according to the user's selection. Accordingly, in the power control apparatus of the forced blocking function according to an embodiment of the present invention, it is possible to block the driving of the control object continuously due to an abnormal state of the processor. As a result, the power control device of the forced cut-off function according to a preferred embodiment of the present invention can prevent the damage of the control target device, as well as thermal destruction of the processor and fire, burns and the like.

As described above, the present invention has been described with reference to the embodiments shown in the drawings, which are merely exemplary, and a person of ordinary skill in the art without departing from the spirit and scope of the present invention. It will be apparent that various modifications, changes, and equivalent other embodiments are possible. Therefore, the true technical protection scope of the present invention will be defined by the technical spirit of the appended claims.

Claims (11)

delete A control switch for switching the power supplied to the control object based on the switching control signal of the processor; A key switch for inputting a forced blocking command to forcibly shut down the control switch when an abnormal state of the processor occurs; A forced blocking control unit for controlling the control switch to be opened by using a memory device which receives and stores the forced blocking command and generates and outputs a forced blocking signal; And a priority output unit configured to apply the forced cutoff signal to the control switch in preference to the switching control signal when the forced cutoff signal is input. The switching control signal from the processor and the forced cutoff signal from the forced cutoff control part are TTL (Transistor Transistor Logic) voltages, The drive voltage of the control switch is a DC voltage higher than the TTL voltage, A first switch driver connected between the processor and the priority output unit to shift a switching control signal from the processor to a voltage level of the control switch driving voltage; And a second switch driver connected between the forced cutoff control unit and the priority output unit to shift the forced cutoff signal of the forced cutoff control unit to a voltage level of the control switch driving voltage. Power control device with shutdown function. delete The method of claim 2, wherein the memory device, And a forced shut-off function for resetting by the processor. The method of claim 2, wherein the forced blocking control unit, A filter for removing noise of a high frequency component included in a forced interruption command from the key switch; A reference voltage setting unit for setting a reference voltage, And a comparator for comparing the forced disconnection command from the filter with the reference voltage and determining a storage time of the storage device based on the result. The method of claim 2, wherein the priority output unit, And a resistor connected between the processor and the control terminal of the control switch, wherein the one-way element transmits the forced shutoff signal of the forced shutoff control unit to the control terminal of the control switch. Power control unit. delete A first control switch for switching the power supplied to the control object based on the switching control signal of the processor; A second control switch provided between the processor and the first control switch; A key switch for inputting a forced blocking command to forcibly shut down the control switch when an abnormal state of the processor occurs; And a forced blocking control unit configured to control the opening of the second control switch by using a memory device that receives and stores the forced blocking command and generates and stores a forced blocking signal. The switching control signal from the processor is a TTL voltage, The drive voltage of the control switch is a DC voltage higher than the TTL voltage, A switch driver connected between the processor and the second control switch and between the first control switch and the second control switch to shift the switching control signal from the processor to a voltage level of the first control switch driving voltage; Power control device of the forced shutdown function, characterized in that comprising a. delete The method of claim 8, wherein the memory device, And a forced shut-off function for resetting by the processor. The method of claim 8, wherein the forced blocking control unit, A filter for removing noise of a high frequency component included in a forced shutoff command of the key switch; A reference voltage setting unit for setting a reference voltage, And a comparator for comparing the forced disconnection command from the filter with the reference voltage and determining a storage time of the storage device based on the result.

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