JPH1153037A - Driving output monitoring circuit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To monitor loads for every load at the beginning of operation by switching a switching means before driving electric power is supplied to a load so that the electric power to be supplied to the load is electric power to be measured, and inspecting the state of the load according to a measured current and displaying the state of the load. SOLUTION: A control judgement part 150 once detecting the operation of an operation start switch 170 connects the movable contact (a) of the switching means 140 to the fixed contact (c) to connect a common power line L0 to a power circuit 130 for measurement. Then one of the loads 3-1 to 3-n is selected to turn on a transistor corresponding to the selection number among Q1 to Qn and turn off other two transistors, thereby supplying a current Im for measurement to the selected load from the power circuit 130 for measurement. Then the control judgement part 150 inputs a measurement current value Is detected by a current measuring instrument 120 and judges that the load is normal when the measured current Is is within a specific range, thereby displaying the decision result at a display part 160.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a drive output monitoring circuit, and more particularly to a drive output monitoring circuit that detects a load state at the start of operation and monitors a drive output.

[0002]

2. Description of the Related Art FIG. 4 is a block diagram showing an example of a conventional drive output monitoring circuit. The conventional drive output monitoring circuit 1
Connected between the driving power supply 2 and the loads 3-1 to 3-n;
At the start of the operation, the respective states of the loads 3-1 to 3-n are detected by measuring the resistances of the loads 3-1 to 3-n.

The drive output monitoring circuit 1 comprises loads 3-1 to 3-
n, a load selection circuit 11 for selecting one from n, loads 3-1 to 3-1
3-n resistance measuring device 12 for measuring resistance, load 3-1
Switch 13 for switching the connection to .about.3-n to drive power supply 2 or resistance measuring device 12, load selection circuit 1 at the start of operation
1 and a switch 13 to control the load 3-1 to 3-n to determine the state of each of the loads 3-1 to 3-n according to the measured resistance of each of the loads 3-1 to 3-n measured by the resistance measuring device 12. And a display unit 15 for displaying the result of the judgment by the control judgment unit 14.

The load selection circuit 11 is composed of NPN transistors Q1 to Qn. NPN transistors Q1-
Qn has a collector connected to the ground terminals of the loads 3-1 to 3-n, an emitter grounded, and a base connected to the control determination unit 14.
Connected to. The transistors Q1 to Qn are controlled by the control judgment unit 1.
The load is switched in accordance with the control signal from the load 4 and is connected to the resistance measuring device 12 to select from loads 3-1 to 3-n.

The power supply terminals of the loads 3-1 to 3-n are connected to a common power supply line L0. Common power line L0
Is connected to the movable contact a of the switching means 13. The fixed contact b of the switching means 13 is connected to the drive power supply 2, and the fixed contact c is connected to the resistance measuring device 12. The movable contact “a” of the switching unit 13 is switched according to a control signal from the control determining unit 14.

The resistance measuring device 12 includes loads 3-1 to 3-n
Of the loads 3-1 to 3-n are detected. The resistance measuring device 12 converts the detected resistance values of the loads 3-1 to 3-n into digital data and supplies the digital data to the control determination unit 14. Control judgment unit 14
Detects the state of each of the loads 3-1 to 3 -n such as short circuit, disconnection, and abnormal resistance value according to the digital data supplied from the resistance measuring device 12, and displays the state on the display unit 15.

FIG. 5 shows a flowchart of a control judging section of an example of a conventional drive output monitoring device. The control judgment unit 14
At the start of the operation, first, the movable contact a of the switching means 13 is connected to the fixed contact c, and the resistance measuring device 1 is connected to the common power supply line L0.
2 are connected (steps S3-1 and S3-2). next,
The control determination unit 14 resets the load selection number N for selecting the loads 3-1 to 3-n to "1" (step S3-
3). Next, the control determination unit 14 turns on the transistor QN corresponding to the selection number N selected in step S3-3 of the load selection circuit 11, and turns off the other transistors (step S3-4). According to step 3-4, load 3
A minute current Im for measurement is supplied to −N from the resistance measuring device 12.

At this time, the control judgment section 14 inputs the measured resistance value Rs detected by the resistance measuring device 12 and compares it with an upper limit value R1 and a lower limit value R2 preset inside (step S3-6). S3-7). If it is determined in step S3-6 that the measured resistance value Rs is smaller than the lower limit resistance value R1, it is determined that the load 3-N is short-circuited (step S3-8).

In step S3-7, the measured resistance value R
If it is determined that s is larger than the upper limit resistance value R2,
It is determined that the load 3-N is disconnected (step S3-
9). Further, if it is determined in steps S3-6 and S3-7 that the measured resistance value Rs is between the lower limit resistance value R1 and the upper limit resistance value R2, then the measured resistance value Rs is set within a predetermined range. It is determined whether or not (R0-.DELTA.R3) <Rs <(R0 + .DELTA.R3) (step S3-10).

In step S3-10, the measured resistance value Rs falls within a predetermined range (R0-.DELTA.R3) <Rs <(R0 + .DELTA.R3).
If so, the load N is determined to be normal (step S3-11), and the measured resistance value Rs is within a predetermined range (R0 -.DELTA.).
R3) <Rs <(R0 + ΔR3), the load N
Is determined to be abnormal in the resistance value (step S3-1).
2).

Next, the above steps S3-6 to S3-1
2 is displayed on the display unit 15 (step S3).
-13). At this time, the loads 3-1 to 3-3 are displayed on the display unit 15.
The load number N for identifying −n and the determination result corresponding to the load number N are displayed, and a display is provided so that it is easy to understand which load has what abnormality. The above steps S3-4 to S3-13 are repeatedly performed for a number n of loads,
The state of each of the loads 3-1 to 3-N is detected (steps S3-14, S3-15).

Thus, the inspection processing at the start of the operation is completed. After inspection of loads 3-1 to 3-n, all loads 3-1
Is normal, the movable contact a of the switching means 13 is connected to the fixed contact b, and the driving power source 2 is connected to the loads 3-1 to 3-n.
Are connected (steps S3-16, S3-17). After the inspection, when the movable contact a of the switching means 13 is connected to the fixed contact b and the driving power supply 2 is connected to the loads 3-1 to 3-n, the resistance measuring device 12 causes the loads 3-1 to 3-n n, and the resistances of the loads 3-1 to 3-n cannot be measured.

[0013]

However, in the conventional driving output monitoring circuit 1, the driving power supply 2 and the loads 3-1 to 3-n
Is connected, the resistance measuring device 12 is disconnected from the loads 3-1 to 3-n.
There were problems such as that monitoring of 1-3-n could not be performed and abnormalities after operation could not be detected.

The present invention has been made in view of the above points, and has as its object to provide a drive output monitoring circuit capable of monitoring a load for each load at the start of operation and at all times after the operation.

[0015]

According to a first aspect of the present invention, there is provided a driving output monitoring circuit for monitoring a state of a load driven by a driving power supply, wherein the driving output monitoring circuit is connected between the driving power supply and the load. Current measuring means for measuring a current supplied to the load, a measuring power supply for supplying a measuring current to the load via the current measuring means, and a power supply for supplying a power to the load via the current measuring means. Switching means for selecting from either one of the measurement power supply; and, before supplying the drive power supply to the load, switching the power supply for supplying the switch means to the load to be the measurement power supply. Means for inspecting the state of the load according to the current measured by the means, displaying the state of the load, and after inspecting the state of the load, the power supply for supplying the switching means to the load is To switch to the drive power source, wherein to drive the load, characterized by having a control determining means for monitoring an abnormality of the load at all times by monitoring the current measured by said current measuring means.

According to the first aspect, before supplying the driving power to the load, the state of the load is inspected by a predetermined measuring power,
Since the state of the load is displayed, it is possible to recognize the abnormality of the load before driving. Further, since the current measuring means is connected in series between the load and the power supply, the current supplied to the load can be measured even after the load is driven by the driving power supply. The state of the load can be monitored by measuring the current supplied to the load.

According to a second aspect of the present invention, there is provided a drive output monitoring circuit for monitoring a state of a plurality of loads driven by a drive power supply,
A current measuring unit connected between the driving power supply and the plurality of loads and measuring a current supplied to the plurality of loads; and a desired load selected from the plurality of loads and selectively connected to the current measuring unit. Load selection means for performing the measurement, a measurement power supply circuit for supplying a measurement current to the plurality of loads via the current measurement means, and a power supply for supplying the plurality of loads via the current measurement means to the drive power supply and the measurement Switching means for selecting either one of a power supply and a power supply, and before supplying the driving power supply to the load, switching the power supply for supplying the switching means to the load to be the measurement power supply; and Means for sequentially selecting one load from the plurality of loads and measuring the current supplied to each of the loads selected by the current measuring means to check the state of each of the plurality of loads. While displaying the states of the plurality of loads, and inspecting the states of the plurality of loads, the switching means switches the power supply for supplying the loads to the drive power supply, and drives the plurality of loads. And a control judging means for constantly monitoring an abnormality of the plurality of loads by monitoring a current measured by the current measuring means.

According to the second aspect, before the driving power is supplied to the plurality of loads, the states of the plurality of loads are sequentially selected and inspected by the predetermined measuring power, and the states of the plurality of loads are displayed. The abnormality of each of the plurality of loads can be recognized before driving. Further, since the current measuring means is connected in series between the load and the power supply, the current supplied to the load can be measured even after the load is driven by the driving power supply. The state of the load can be monitored by measuring the current supplied to the load.

Preferably, the control judging means detects an abnormality in each of the plurality of loads before supplying the driving power to the loads when supplying the driving power to the plurality of loads. The supply of the driving power to the plurality of loads is controlled according to the performed load. According to the third aspect, when driving power is supplied to a plurality of loads, driving to a plurality of loads is performed in accordance with a load in which an abnormality is detected in each of the plurality of loads before the driving power is supplied to the load. By controlling the supply of power, an operation capable of normal operation can be performed without stopping.

[0020]

FIG. 1 is a block diagram showing an embodiment of a drive output monitoring circuit according to the present invention. The drive output monitoring circuit 100 according to the present embodiment includes a load selection circuit 110 that controls connection of the loads 3-1 to 3-n, a current measurement device 120 that measures current supplied to the loads 3-1 to 3-n, Measurement power supply 1 for supplying a measurement current to loads 3-1 to 3-n at the start of operation
30, a switching means 140 for switching the power supply of the loads 3-1 to 3-n to the driving power supply 2 or the measuring power supply 130, and a load selecting circuit 110 and a switching means 140 at the start of the operation as described later.
And each load 3-3 detected by the current measurement circuit 110 is controlled.
Each of the loads 3-1 to 3-n according to the current flowing through
And after the operation, the loads 3-1 to 3-
n, which is always detected by the current measuring circuit 110 by the current measuring circuit 110, and determines the state of the loads 3-1 to 3-n.
50, a display unit 160 for displaying the result of the judgment by the control judgment unit 150, and an operation start switch 170 for instructing an operation start.

The load selection circuit 110 includes loads 3-1 to 3-
NPN transistors Q1 to Qn provided corresponding to n
Consists of The transistor Q1 has a collector connected to the ground terminal of the load 3-1, an emitter grounded,
The base is connected to the control determining unit 150. Similarly, the transistors Q2 to Qn have collectors connected to the ground terminals of the loads 3-2 to 3-n, an emitter grounded, and a base connected to the control determination unit 150.

The transistors Q1 to Qn are connected to the control
The respective base potentials are controlled and switched by 50. By selectively turning on the transistors Q1 to Qn, the ground terminals of the loads 3-1 to 3-n are grounded, and the measurement current is selectively supplied to the loads 3-1 to 3-n. Become. The current measuring device 120 is connected in series to a common power supply line L0 to which power supply terminals of the loads 3-1 to 3-n are commonly connected at one end, measures a current flowing through the common power supply line L0, and converts the current into digital data. Then, it is supplied to the control determining unit 150.

The other end of the common power supply line L0 is connected to the switching means 14
0 movable contact a. The switching means 140 is composed of a relay. The movable contact a is connected to the common power supply line L0, the fixed contact b is connected to the drive power supply 2, and the fixed contact c is connected to the measurement power supply circuit 130. Switching means 140
According to the switch, the movable contact a is connected to the fixed contact b or c in accordance with the switching signal supplied from the control judging unit 150, and switches the supply source of the current supplied to the common power supply line L0. The measuring power supply circuit 130 comprises a constant voltage source 130a and a resistor R0. When the movable contact a of the switching means 140 is connected to the fixed contact c, the measuring current Im is supplied to the common power supply line L0.
Supply.

The driving power supply 2 has a switching means 1 on the positive electrode side.
When the movable contact a of the switching means 140 is connected to the fixed contact b, the drive for driving the loads 3-1 to 3-n to the common power supply line L0. Supply current ID. Control judgment unit 150
Detects the operation start by detecting the operation of the operation start switch 170, controls the switching means 140 and the load selection circuit 110, checks the state of each of the loads 3-1 to 3-n, and checks whether there is any abnormality. Is detected.

FIG. 2 is a flow chart of the control judging section of one embodiment of the drive output monitoring circuit of the present invention. Control judgment unit 1
50 detects the operation of the operation start switch 170,
First, the movable contact a of the switching means 140 is connected to the fixed contact c, and the common power supply line L0 is connected to the measuring power supply circuit 130 (steps S1-1 and S1-2).

Next, the control determining unit 150 determines that the loads 3-1 to 3-1
The load selection number N for selecting 3-n is reset to "1" (step S1-3). Next, the control determination unit 150
The transistor QN corresponding to the selection number N selected in step S1-3 of the load selection circuit 110 is turned on, and the other transistors are turned off (step S1-4). In step 1-4, the measurement current Im is supplied from the measurement power supply circuit 130 to the load 3-N.

At this time, the control judging section 150 inputs the measured current value Is detected by the current measuring device 120 and converted into digital data, and compares it with the preset upper limit value L1 and lower limit value L2. (Steps S1-5, S
1-6, S1-7). If it is determined in step S1-6 that the measured current value Is is larger than the upper limit value L1, it is determined that a current of a predetermined value or more is flowing through the load 3-N.
It is determined that -N is short-circuited (step S1-8).

In step S1-7, the measured current value I
If it is determined that s is smaller than the lower limit L2, only a current equal to or less than a predetermined value flows through the load 3-N.
It is determined that N is disconnected (step S1-9). Further, in steps S1-6 and S1-7, the measured current value Is
Is determined to be between the upper limit value L1 and the lower limit value L2, the measured current value Is is then reduced to a predetermined range (L0-Δ
L3) <Is <(L0 + .DELTA.L3) is determined (step S1-10).

In step S1-10, the measured current value Is falls within a predetermined range (L0-.DELTA.L3) <Is <(L0 + .DELTA.L3).
If so, it is determined that the load N is normal (step S1-11), and the measured current value Is is within the predetermined range (L0 -Δ).
L3) <Is <(L0 + .DELTA.L3), the load N
Is determined to be abnormal in the resistance value (step S1-1).
2).

Next, the above steps S1-6 to S1-1
2 is displayed on the display unit 160 (Step S
1-13). At this time, the load 3-1 is displayed on the display unit 160.
The load number N for identifying .about.3-n and the determination result corresponding to the load number N are displayed, and a display is provided so that it is easy to know which load has what abnormality. Steps S1-4 to S1-13 are repeated n times for the number of loads, and the state of each of the loads 3-1 to 3-N is detected (steps S1-14, S1-15).

With the above, the inspection processing at the start of the operation is completed. Next, the control determination unit 150 determines whether the load selection circuit 110
Out of the transistors S1-
4 to S1-15, the transistor corresponding to the load determined to be abnormal and the load associated therewith is not turned on, that is, disabled, the load is determined to be normal, and the load does not operate in relation to the load determined to be abnormal. After the setting for turning on the corresponding transistor is performed, the movable contact a of the switching means 140 is connected to the fixed contact b, and the drive power supply 2 is applied to the operable load to perform the operation (step S1-
16, S1-17).

After the operation, the control judging section 150 monitors the measured current Is' measured by the current measuring device 120 and performs a constant monitoring process until an operation stop operation is performed (steps S1-18, S1-19). ). Here, step S1
The monitoring process after the operation of -18 will be described with reference to the drawings. FIG. 3 shows a flowchart of the monitoring process of the control determining unit according to one embodiment of the present invention.

In the monitoring process, first, the current measuring device 120
Of the loads 3-1 to 3-N to be supplied to the operating load (step S2-
1). The control determining unit 150 determines whether the input measured current value Is
'Inside the preset upper limit value LS11 and lower limit value LS
12 (step S2-2).

In step S2-2, if the measured current value Is 'is within the predetermined range LS11 <Is'<LS12, the load N
Is determined to be normal, returning to step S2-1,
Operation continues. If the measured current value Is 'is not within the predetermined range LS11 <Is'<LS12, it is determined that there is an abnormality in the resistance value of any of the operating loads (step S2-3).

If an abnormality occurs in the operating load in step S2-2, the transistor Q of the load selection circuit 110
1 to Qn are all turned off, supply of current to the loads 3-1 to 3-n is stopped, and the determination result is displayed on the display unit 160 (steps S2-4, S2-5). As described above, according to the present embodiment, when the operation starts, the load selection circuit 110 loads the load 3.
-1 to 3-n are sequentially selected, and the current supplied to each load is detected by the current measuring device 120 connected in series to the common power supply line L0 commonly connected to the loads 3-1 to 3-n. Then, it is possible to detect a state of each load such as short circuit, disconnection, abnormal resistance value, etc., and to issue a warning.

Even after the driving power supply 2 is connected to the loads 3-1 to 3-n, the current measuring device 120 is connected in series to the common power supply line L0. Can be measured by the current measuring device 120. Therefore, it is possible to detect a load abnormality after the operation.

[0037]

As described above, according to the first aspect of the present invention, before the driving power is supplied to the load, the state of the load is inspected by the predetermined measuring power and the state of the load is displayed.
Since the load abnormality can be recognized before driving and the current measuring means is connected in series between the load and the power supply, the current supplied to the load can be measured even after the load is driven by the driving power supply. In addition, even after driving the load, the current state is measured by measuring the current supplied to the load by the current measuring means.

According to the second aspect, before the driving power is supplied to the plurality of loads, the states of the plurality of loads are sequentially selected and inspected by the predetermined measuring power, and the states of the plurality of loads are displayed. The abnormality of each of the plurality of loads can be recognized before driving. Further, since the current measuring means is connected in series between the load and the power supply, the current supplied to the load can be measured even after the load is driven by the driving power supply. It has features such as the ability to monitor the state of the load by measuring the current supplied to the power supply.

According to the third aspect, when supplying drive power to a plurality of loads, a plurality of loads are provided in accordance with the load for which an abnormality is detected in each of the plurality of loads before the drive power is supplied to the load. By controlling the supply of the drive power to the power supply, it is possible to perform an operation capable of normal operation without stopping the operation.

[Brief description of the drawings]

FIG. 1 is a block diagram showing an embodiment of a drive output monitoring circuit according to the present invention.

FIG. 2 is an operation flowchart of a control determining unit of the driving output monitoring circuit according to one embodiment of the present invention.

FIG. 3 is a flowchart of a monitoring process of a control determining unit of the driving output monitoring circuit according to one embodiment of the present invention.

FIG. 4 is a block diagram illustrating an example of a conventional drive output monitoring circuit.

FIG. 5 is an operation flowchart of a control judgment unit of an example of a conventional drive output monitoring circuit.

[Explanation of symbols]

 2 Drive power supply 3-1 to 3-n Load 100 Drive output monitoring circuit 110 Load selection circuit 120 Switch 130 Measurement power supply circuit 140 Current measurement circuit 150 Control judgment unit 160 Display unit Q1 to Qn NPN transistor

Claims (3)

[Claims] 1. A drive output monitoring circuit for monitoring a state of a load driven by a drive power supply, comprising: a current measuring means connected between the drive power supply and the load, for measuring a current supplied to the load. A switch for selecting a measurement power supply for supplying a measurement current to the load via the current measurement means, and a power supply for supplying the load via the current measurement means from the drive power supply or the measurement power supply; Means, before supplying the drive power to the load, switching the switching means so that the power supplied to the load is the measurement power, and switching the load in accordance with the current measured by the current measurement means. Inspecting the state, displaying the state of the load, and after inspecting the state of the load, switching the power supply for supplying the switching means to the load to be the drive power supply; Serial drives the load, the drive output monitoring circuit, characterized by comprising a control determining means for monitoring an abnormality of the load at all times by monitoring the current measured by said current measuring means. 2. A drive output monitoring circuit for monitoring a state of a plurality of loads driven by a drive power supply, wherein the drive output monitoring circuit is connected between the drive power supply and the plurality of loads, and detects a current supplied to the plurality of loads. Current measuring means for measuring; load selecting means for selectively connecting a desired load from the plurality of loads to the current measuring means; measuring power supply for supplying a measuring current to the plurality of loads via the current measuring means A circuit, switching means for selecting a power supply to be supplied to the plurality of loads via the current measuring means from the drive power supply or the measurement power supply, and before supplying the drive power supply to the load, The switching means is switched so that the power supply for supplying the load becomes the measurement power supply, and one load is sequentially selected from the plurality of loads by the load selection means. The state of each of the plurality of loads is inspected by measuring the current supplied to each of the selected loads, and the state of each of the plurality of loads is displayed, and after inspecting the state of the plurality of loads, The switching means is switched so that the power supplied to the load becomes the driving power, the plurality of loads are driven, and the current measured by the current measuring means is monitored, so that the abnormality of the plurality of loads is constantly detected. A drive output monitoring circuit comprising a control judgment unit for monitoring. 3. The control determining means, when supplying the drive power to the plurality of loads, detects a load detected as abnormal in each of the plurality of loads before supplying the drive power to the load. 3. The drive output monitoring circuit according to claim 2, wherein the supply of the drive power to the plurality of loads is controlled according to the following.