JP2003168173A - Power supply part abnormality detector - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a power supply part abnormality detector meeting a demand for a low cost by simple constitution such as using a multipurpose part, etc., as the power supply part abnormality detector for monitoring the output of a power supply to a display device for giving notice of abnormality and preventing the occurrence of erroneous display. <P>SOLUTION: The power supply part abnormality detector for monitoring the output of the power supply to a display part for detecting abnormality is provided with a voltage monitoring circuit 3 which monitors power voltage outputted to the display part 2 from a displaying power supply part 1 to output a signal when the voltage comes to have a value out of a prescribed range, and a control circuit 5 receiving a signal from the voltage monitoring circuit 3. When the power voltage does not meet its normal range condition set in advance, the control circuit judges the occurrence of abnormality in the power voltage. Then, the control circuit informs a server 4 of the abnormality via an output contact interface part 6 and disconnects the output of the power supply to the display part. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention detects a power supply unit incorporated in a display device for driving various display units when an abnormality occurs in the power supply output, and displays an erroneous display on the display unit. The present invention relates to a power supply unit abnormality detection device that can appropriately take measures so as not to wake it up.

[0002]

2. Description of the Related Art Conventionally, a power supply abnormality detecting means for monitoring a power supply output to various devices including a display device and detecting an abnormality thereof has been used, and most of them include a voltage monitoring circuit for monitoring a power supply voltage. Is.

[0003]

However, in the above-mentioned conventional voltage monitoring circuit, a dedicated circuit suitable for the device is designed, and the cost is high and the structure can be simplified. There wasn't.

Therefore, the present invention is a power supply unit abnormality detection device for monitoring the power supply of a display device to notify an abnormality and not to cause an erroneous display. An object is to provide a partial abnormality detection device.

[0005]

In order to achieve the above-mentioned object, a power supply section abnormality detecting device of the present invention is a power supply section for detecting an abnormality by monitoring a power supply output to a display section which receives a signal from a server and displays. In the abnormality detection device, a voltage monitoring unit that monitors the power supply voltage output from the power supply unit to the display unit and outputs a signal when the voltage goes out of a predetermined range; and a preset value when the signal from the voltage monitoring unit is received. When the power supply is out of the normal range condition, the power supply is determined to be abnormal, the server is notified of the abnormality, and a control means for disconnecting the power output from the power supply to the display is provided. It is characterized by.

Further, the voltage monitoring means is characterized by using a reset IC.

The control means informs the server of the abnormality by changing the circuit contact leading to the server from open to closed or from closed to open to cause a voltage / current change in the circuit of the server. Is.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows a power supply unit abnormality detection device according to the present invention.
It receives a supply of AC200V, converts it to a DC display power supply, and supplies it to the display unit 2. The display power source for the display unit 2 is supplied to the reset IC
Is monitored by the voltage monitoring circuit 3. This reset IC turns on the power of the CPU and logic circuit.
This is a general-purpose IC for preventing malfunction of the system that occurs in a transient state such as turning on / off or momentary interruption.
It is also possible to use a simple structure having three terminals of D and reset output. Then, when it is detected that the power supply voltage (or detection voltage) has dropped below the set threshold, a reset signal is output (open collector output).

However, when the reset signal from the voltage monitoring circuit 3 including the reset IC is output as an abnormality detection signal to the server 4 which is sending the signal to the display device as it is, the display content is originally abnormal. Since it is judged as abnormal even if there is a momentary interruption or noise mixing that can be within a normal range that does not occur, this causes the inconvenience that the "abnormality" is frequently detected and the system stops. It happens. Therefore, the reset signal from the voltage monitoring circuit 3 is input to the control circuit 5, and the control circuit 5
Indicates that the server 4 is notified of an abnormality via the output contact interface unit 6 only when the reset signal deviates from the preset normal range condition of the power supply voltage (for example, the reset signal continues for 1 second).

The output contact interface unit 6 is, for example, a normally open contact in a normal state and a continuous closed contact in an abnormal state. When the current flows through the circuit that communicates with the circuit, a voltage / current change occurs in the circuit of the server 4, and the abnormality is transmitted. As a result, the server 4 enters the abnormality detection mode, and outputs an alarm, disconnects the power supply, etc. as necessary. At the same time, from the output contact interface section 6, a power supply for the display power supply section 1 is cut off by using a relay (not shown) to turn off the display (turn off the power supply for the display power supply section 1). If you don't, there is a risk that incorrect display will continue while the last display data is retained). This eliminates the risk of erroneous display on the display unit 2 due to a power supply abnormality.

Regarding the operation of the output contact interface section 6, not only the above-mentioned normal operation is an open contact and a closed contact in an abnormal state, but the normal operation may be a closed contact and an open contact in an abnormal state. Is.

[0012]

As described above in detail, according to the power supply section abnormality detecting device of the present invention, the power supply output to various devices such as the display device can be monitored and the abnormality can be surely notified. By using a reset IC as the monitoring means,
The power supply unit abnormality detection circuit can be configured at low cost with a simple configuration such as using general-purpose components.

[Brief description of drawings]

FIG. 1 is an explanatory diagram showing a system of a power supply unit abnormality detection device of the present invention.

[Explanation of symbols]

1 Power supply for display 2 Display 3 Voltage monitoring circuit 4 servers 5 control circuit 6 Output contact interface section

   ─────────────────────────────────────────────────── ─── Continued front page    F-term (reference) 5C086 AA31 BA13 CA02 DA01 EA05                       FA20                 5G053 AA08 BA04 CA01 DA01 EA01                       EB05 EC01 FA06

Claims (3)

[Claims] 1. A power supply section abnormality detection device for detecting an abnormality by monitoring a power supply output to a display section that receives a signal from a server and monitors the power supply voltage output from the power supply section to the display section. When the voltage is outside the predetermined range, the voltage monitoring means outputs a signal, and when the signal from the voltage monitoring means is received, if the preset normal range condition of the power supply is exceeded, the power supply is abnormal. A power supply unit abnormality detection device comprising: a control unit that makes a determination and notifies the server of the abnormality and cuts off power output from the power supply unit to the display unit. 2. The power supply section abnormality detection device according to claim 1, wherein a reset IC is used as the voltage monitoring means. 3. The control means informs the server of the abnormality by changing a circuit contact leading to the server from open to closed or from closed to open to cause a voltage / current change in the circuit of the server. The power supply unit abnormality detection device according to Item 1 or 2.