JPH114534A - Power supply - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make it possible to find the cause of abnormality promptly. SOLUTION: An abnormality detecting circuit 41 in an input power supply and a secondary overcurrent detecting circuit 47 monitors whether or not abnormality occurred outside when viewed from a power supply 10. If abnormality is detected, the circuits cause a current to flow into the set winding 71a of a latch relay 71 to be kept in a set state, while a current flow into the reset winding 71b of the latch relay 71 is inhibited unless a reset switch 74 is operated. When a power supply control circuit 30 stops the operation of a power supply part 20 on detecting abnormality, this structure enables the latch relay 71 to maintain the set state when a breaker switch is turned on again even after turned off, thereby making it possible to understand instantly that it is the external abnormality that stopped the operation.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a power supply device,
In particular, the present invention relates to a power supply device that automatically stops when an abnormality is detected.

[0002]

2. Description of the Related Art Conventionally, a power supply device of this type is known as shown in FIG. In FIG.
Includes a power supply unit 2 connected to a primary commercial AC power supply and outputting DC power to a secondary side, and a power supply control circuit 3 for controlling the operation of the power supply unit 2. The power supply control circuit 3 includes a switch detection circuit 5 together with various abnormality detection circuits 4.
Are connected to control the operation of the power supply unit 2. An abnormality display circuit 6 having a light-emitting display element is also connected to the power supply control circuit 3, and when the abnormality is detected by the abnormality detection circuit 4, the abnormality is displayed by light emission display.

Here, as the abnormality detection circuit 4, an input power supply abnormality detection circuit 4a and an output overvoltage detection circuit 4b
The under-voltage detection circuit 4c, the power supply temperature abnormality detection circuit 4d, the power supply fan abnormality detection circuit 4e, and the overcurrent detection circuit 4f are connected to the power supply control circuit 3.

[0004]

In the conventional power supply device described above, when the operation is stopped due to an abnormality, only the fact that there is an abnormality is displayed, but whether the cause is the power supply device itself or not. I didn't know. For example, even if there is a power failure on the primary side or a failure on the load side, the power supply unit detects the abnormality and stops operation.If the power supply unit fails, it detects the abnormality and resumes operation. Stop. Therefore, if the operation is stopped after indicating that there is an abnormality, the maintenance person has no choice but to replace the power supply and request a repair. However, if the cause of the abnormality is outside the power supply, it takes time for the person in charge of repair to find the cause of the failure, and the repair requester must resume operation without removing the cause of the failure. There was a problem that would become.

[0005] The present invention has been made in view of the above problems, and has as its object to provide a power supply device capable of locating and eliminating the cause of an abnormality at an early stage.

[0006]

According to a first aspect of the present invention, there is provided a power supply unit connected to a primary-side power source and outputting power in a power form corresponding to a load side. Abnormality detecting means for detecting the abnormality on the external side as seen independently of the abnormality on the internal side; control means for stopping the operation of the power supply unit when an abnormality is detected by the abnormality detecting means; An external abnormality holding means capable of holding a trace when an external abnormality is detected by the detection means is provided.

[0007] In the invention according to claim 1 configured as described above, the power supply unit connected to the primary-side power source outputs power in a power form corresponding to the load side. In parallel with this, the abnormality detecting means detects the abnormality on the external side viewed from the power supply unit independently of the abnormality on the internal side. The control means stops the operation of the power supply unit when the abnormality is detected by the abnormality detection means. On the other hand, when an abnormality on the outside is detected by the abnormality detecting means, the external abnormality holding means holds the trace.

That is, when an external abnormality is detected, the operation of the power supply unit is stopped by the control means, and the external abnormality holding means leaves a trace of the external abnormality. Therefore, in the event of an abnormal stop, the maintenance person should judge whether there is any evidence of an external abnormality and, if there is any evidence, take action to eliminate the cause other than the power supply unit. Actions may be taken to replace or repair. In this case, the power supply section only needs to be able to stop the operation by the control means, and the properties of the primary side and the secondary side are not particularly limited. For example, various modes such as an AC-AC power supply, an AC-DC power supply, and a DC-AC power supply are possible.

The abnormality detecting means only needs to detect at least an abnormality on the external side viewed from the power supply unit independently of an abnormality on the internal side. In this sense, the abnormality detecting means may simply detect an abnormality on the external side. When detecting an abnormality on the inner side, the abnormality may be detected individually. The type of abnormality is not particularly limited, and various abnormalities may be detected. As one example, the invention according to claim 2 is the power supply device according to claim 1, wherein the abnormality detection unit includes:
It is configured to detect an abnormality on the primary side power source and an abnormality on the load side as abnormalities on the external side.

In the invention according to claim 2 configured as described above, the abnormality detecting means detects the abnormality on the primary side power source and the abnormality on the load side as the abnormality on the external side.
The control means only needs to be able to stop the power supply unit when the abnormality detection means detects an abnormality, and can be realized in various modes according to the specifications of the power supply unit. Therefore, when the power supply unit can directly input a detection signal from the abnormality detection unit, the power supply unit may be configured as such a signal line, and a predetermined sequence for operating or stopping the power supply unit may be included. May be configured as a control circuit that executes the sequence when necessary. Further, a process of performing a predetermined display at the time of abnormality may be controlled.

[0011] The external abnormality holding means retains a trace of an external abnormality. Therefore, it is necessary to keep the same trace even when the power supply or the like is cut off when the operation of the power supply unit stops. It is only necessary to maintain the same shape mark, and it may be a non-recoverable type such as a fuse or a type which can be recovered by a reset switch or the like. As a preferred example of the latter, according to a third aspect of the present invention, in the power supply device according to any one of the first and second aspects, the external abnormality holding means includes a signal for detecting an external abnormality in the abnormality detection means. A latch relay having two windings, a set winding supplied with a current and a reset winding reset by operation of a reset switch, and an external abnormality indicator that is controlled on / off by the latch relay. is there.

According to the third aspect of the present invention, a latch relay is provided, and when the abnormality detecting means detects an external abnormality, a current is supplied to the set winding by a signal of the external abnormality. The latch relay changes from a reset state to a set state. This latch relay has a configuration having a reset winding to control on / off of the external abnormality indicator. Therefore, the maintenance person can determine the presence or absence of an external abnormality by checking the external abnormality indicator when the operation is abnormally stopped. On the other hand, after taking a predetermined measure, the current is supplied to the reset winding and reset by operating the reset switch.

Various methods can be adopted for supplying current to the set winding of the latch relay. For example, the invention according to claim 4 is based on claims 1 to 3. In the power supply device according to any one of the above, the set winding has one end connected to at least a power line, and the other end connected to an inverted output of an external abnormality signal line corresponding to an external detection result of the abnormality detection unit. There is a configuration.

In the invention according to claim 4 configured as described above, when the abnormality detection means outputs an ON output when an abnormality is detected, the OFF output is normally performed. Therefore, normally, although ON power is supplied from the power line to one end of the set winding, an ON output having the inverted OFF output is supplied to the other end, and as a result, no current is supplied. However, in the event of an abnormality, the abnormality detecting means turns on the output, and the inversion output, which is the inversion result, is supplied to the other end of the set winding. Then, since different outputs are supplied to both ends of the set winding, current is supplied, and as a result, the set is set.

[0015]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing a power supply device according to an embodiment of the present invention. In FIG. 1, a power supply device 10 outputs a DC power supply from a commercial AC power supply by a workstation, and includes a power supply unit 20 including a rectifier circuit, a smoothing circuit, and the like. The power supply unit 20 includes an operation control terminal 21.
The operation is controlled by being connected to a power supply control circuit 30 and inputting a predetermined operation start signal and an operation stop signal.

In the present embodiment, the power supply unit 20 and the power supply control circuit 30 are separate units. However, if it is preferable to integrate them in terms of circuit formation, an integrated circuit configuration may be adopted. it can. The power supply device 10 is provided with a breaker switch (not shown) and a normal on / off switch.
Operate the on / off switch as needed, and turn it off with the breaker switch only when not in use for a long time.

The power supply control circuit 30 is connected with various abnormality detection circuits 40 and a switch detection circuit 50. The switch detection circuit 50 monitors the operation status of the above-described on / off switch, and monitors the on / off state. The power supply unit 20 is operated and stopped according to the operation of the off switch, and when an abnormality is detected, the operation of the power supply unit 20 is stopped regardless of the state of the on / off switch.

The abnormality detection circuit 40 comprises the following detection circuits. That is, an input power supply abnormality detection circuit 4 for detecting abnormality such as instantaneous interruption, instantaneous stop, or rise of the input power supply.
1, an output overvoltage detection circuit 42 for detecting an abnormality when the output voltage rises above the rated value, an output voltage shortage detection circuit 43 for when the output voltage falls below the rated value, and an internal temperature exceeding the allowable temperature. A power supply temperature abnormality detection circuit 44 for detecting an abnormality when the temperature rises, a power supply fan abnormality detection circuit 45 for detecting a rotation decrease or stop abnormality due to a fan life in the power supply 10, and a failure on the input power supply side And a secondary side overcurrent detection circuit 47 for detecting a short circuit or an overcurrent abnormality due to a short circuit or an overcurrent caused by a load side failure. These are low-level outputs when no abnormality is detected, and are high-level outputs when abnormality is detected.

Here, these detection circuits can be classified into two types of detection targets. That is, the power supply device 10
The input power supply abnormality detection circuit 41 and the secondary side overcurrent detection circuit 47 correspond to the latter. Since each detection circuit is independent for each detection target, it can be said that the external abnormality in this case is also detected independently and independently of the internal abnormality.

The power supply control circuit 30 has a power supply abnormality display circuit 6
0 is also connected to the abnormality detection circuit 40 as described above.
In addition to controlling the operation of the power supply unit 20 based on the abnormality detection signal from the CPU, the control signal to the power supply abnormality display circuit 60 is also output. Here, the power supply abnormality display circuit 60
Is supplied with power from the power supply control circuit 30 via the power line 22, and an LED (not shown) is turned on in response to the control signal to indicate a power supply abnormality. In this embodiment, only the LED is provided, but a configuration including a buzzer or the like may be employed. The power line 22 is supplied with power as long as the breaker switch is turned on, regardless of the operation of the on / off switch.

The power line 22 is connected to a power failure display circuit 60 and a failure determination circuit 70.
The power line 22 is grounded via a contact 72 of the latch relay 71, a resistor 73a, and an external abnormality display LED 73b. The contact 72 is non-conductive (break) when the latch relay 71 is in the reset state, and is conductive (make) when the latch relay 71 is in the set state. Therefore, in the set state, power is supplied from the power line 22 to the external abnormality display LED 73b to emit light.

The latch relay 71 has a set winding 71a and a reset winding 71b.
Is connected to the power line 22, and the other end is grounded via a reset switch 74. The reset switch 74 is a push-down type, which is non-conductive when not operated, and is conductive when pressed down. When conducting, power is supplied from the power line 22 to the reset winding 71b, and the contact 72 is changed from the set state to the reset state.

The set winding 71a has one end connected to the power line 22 and the other end connected to the output end of an inverter circuit 75. The inverter circuit 75 has an input power abnormality for detecting the above-mentioned external abnormality. Detection circuit 41
And the output of the secondary side overcurrent detection circuit 47 is a diode 76
a and 76b are supplied in a wired OR connection. As described above, since each abnormality detection circuit is normally turned off, the off output is also supplied to the inverter circuit 75 via the diodes 76a and 76b. Output a certain high level. Then, in the set winding 71a, both the side connected to the power line 22 and the side connected to the inverter circuit 75 become high level, and no current flows. That is, during normal operation, no current is supplied and no setting is performed.

However, the input power supply abnormality detection circuit 41
If either or both of the secondary-side overcurrent detection circuits 47 detect an abnormality, the wired-OR result becomes a high level, and the inverter circuit 75 outputs a low level which is the inversion result. Then, one end of the set winding 71a is connected to the power line 22 to be at a high level, and the other end is connected to the inverter circuit 75 to be at a low level, so that a current flows. Therefore, it is set.

Once the latch relay 71 is set, it remains in the set state unless the reset switch 74 is manually operated, leaving a trace of an external abnormality. Therefore, an abnormality is detected and the power supply control circuit 30
When the operation of the power supply unit 20 is stopped, a maintenance person or the like operates the breaker switch to shut down the power supply. In such a case, the latch relay 71 keeps the set state. When the switch is turned on, the contact 72 remains conductive, and it can be determined at a glance that the maintenance person or the like has stopped the operation due to an external abnormality.

The set winding 71a and the reset winding 7
Diodes 71c and 71d for short-circuiting the current flowing through the coil when the state changes are connected in parallel to 1b. The input of the inverter circuit 75 is connected to a pull-down resistor 76c for preventing malfunction.

Next, the operation of this embodiment having the above configuration will be described. FIG. 2 is a timing chart showing the operation of the power supply device 10 and will be described with reference to the timing chart.

The maintenance person and the workstation user can
The breaker switch is turned on at the timing T1, but at this time the on / off switch is in the off state, and the power supply control circuit 30 does not instruct the power supply unit 20 to operate. Therefore, the output voltage remains at the off level. Continue,
When the user of the workstation turns on the on / off switch at timing T2, the power supply control circuit 30 detects the operation by the switch detection circuit 50,
Instruct the power supply unit 20 to start operation. Therefore, the output voltage of the power supply unit 20 increases from the timing T3a delayed by a minute timing, and reaches the normal operating voltage at the timing T3b. Usually, the operation is maintained as it is.

However, when an external abnormality occurs at timing T4, the output of either the input power supply abnormality detection circuit 41 or the secondary side overcurrent detection circuit 47 becomes high level,
The power supply control circuit 30 outputs a control signal to the power supply abnormality display circuit 60 to turn on the power alarm LED, and gives an instruction to the power supply unit 20 to stop the operation. Then, the output voltage of the power supply unit 20 decreases from the timing T5a immediately after, and becomes completely off level at the timing T5b.

On the other hand, when the output of either the input power supply abnormality detecting circuit 41 or the secondary side overcurrent detecting circuit 47 becomes high level, the input level of the inverter circuit 75 becomes high level. Low level. Then, a difference occurs in the voltage between both ends of the set winding 71a in the latch relay 71, a current flows, and the latch relay 71 is set. Accordingly, the power alarm LE 60
The external abnormality display LED 73b is turned on together with D.

When the user of the workstation turns off the on / off switch at the timing T6, the power supply control circuit 30 stops outputting the control signal to the power supply abnormality display circuit 60 at that time. The power alarm LED in the abnormality display circuit 60 is turned off. However, while the breaker switch is turned on, power is supplied to the power line 22 and the external abnormality indication LE
D73b continues to light. Therefore, if the maintenance person waits for arrival, it is possible to determine that an external abnormality has occurred and the operation has been stopped.

However, if the maintenance person cannot wait, the breaker switch is cut off at the timing T7, so that the external abnormality display LED 73b is turned off.
However, since the state of the latch relay 71 itself does not change at all, the contact 72 remains conductive. Therefore, when the maintenance person arrives and turns on the breaker switch at timing T8, a current flows from the power line 22 to the external abnormality display LED 73b via the contact 72 at that time, and the maintenance person immediately turns on the external abnormality. Indicates that the operation was stopped. Thus, it can be determined that the power supply device 10 itself does not need to be replaced, and appropriate measures are taken. Needless to say, in this case, when the reset switch 74 is pressed down at the timing T9, a current flows through the reset winding 71b of the latch relay 71 to be reset. Then, the contact 72 is turned off, and the external abnormality display LED 73b is turned off.

As described above, the input power supply abnormality detection circuit 41 and the secondary-side overcurrent detection circuit 47 monitor whether or not an abnormality has occurred on the external side as viewed from the power supply device 10, and
When an abnormality is detected by these, the latch relay 7
In this case, the current is prevented from flowing through the reset winding 71b of the latch relay 71 unless the reset switch 74 is operated. 30
When the power supply unit 20 stops operating, and the breaker switch is turned off and then turned on again, the latch relay 71
Maintains the set state, and it can be immediately determined that the operation has been stopped due to an external abnormality.

[0034]

As described above, according to the present invention, when the operation is stopped due to an external abnormality, the trace of the operation is left, so that the maintenance person can immediately judge whether at least the power supply itself is faulty or not. In addition, a power supply device capable of performing appropriate recovery processing can be provided. According to the second aspect of the invention, an external abnormality can be detected on both the input side and the output side. Further, according to the third aspect of the present invention, a simple configuration can be realized by using the latch relay.

Further, according to the invention of claim 4,
This can be realized with an extremely simple configuration in which only the inverted output of the abnormality detecting means is supplied to the set winding in the latch relay.

[Brief description of the drawings]

FIG. 1 is a block diagram of a power supply device according to an embodiment of the present invention.

FIG. 2 is a timing chart of the power supply device.

FIG. 3 is a block diagram of a conventional power supply device.

[Explanation of symbols]

 Reference Signs List 10 power supply device 20 power supply unit 22 power line 30 power supply control circuit 40 abnormality detection circuit 41 input power supply abnormality detection circuit 47 secondary side overcurrent detection circuit 50 switch detection circuit 60 power supply abnormality display circuit 70 failure determination circuit 71 latch relay 71a set winding 71b Reset winding 72 Contact 73b External abnormality display LED 74 Reset switch 75 Inverter circuit

Continued on the front page (51) Int.Cl. ⁶ Identification code FI H02J 1/00309 H02J 1 / 00309V

Claims (4)

[Claims] 1. A power supply unit connected to a primary-side power source and outputting power in a power form corresponding to a load side, and detecting an abnormality on an external side viewed from the power supply unit independently of an abnormality on an internal side. Abnormality detection means, control means for stopping the operation of the power supply unit when the abnormality detection means detects an abnormality, and holding the trace when an external abnormality is detected by the abnormality detection means A power supply device comprising a possible external abnormality holding means. 2. The power supply device according to claim 1, wherein the abnormality detecting means detects an abnormality on a primary power source and an abnormality on the load side as external abnormalities. Power supply. 3. The power supply device according to claim 1, wherein the external abnormality holding unit includes a set winding that is supplied with current by an external abnormality detection signal from the abnormality detection unit; A power supply device comprising: a latch relay having two windings, a reset winding that is reset by operation of a reset switch; and an external abnormality indicator that is turned on and off by the latch relay. 4. The power supply device according to claim 3, wherein one end of the set winding is connected to at least a power line, and the other end of the set winding has an external abnormality signal corresponding to an external detection result of the abnormality detection means. A power supply device connected to the inverted output of the line.