JPH03233617A - Power supply monitor circuit - Google Patents

Abstract

PURPOSE:To prevent the power source of a peripheral equipment from being forgotten for turning on when starting business by detecting the OFF state of the power source of the peripheral equipment when the power source of a main body is turned on, and raising an alarm. CONSTITUTION:Peripheral equipment power supply state signals DCN are respec tively connected from peripheral equipments 4 and 5 to the input ends of two AND gates 2a in a peripheral equipment power supply state detection circuit 2, and when the power source of a main body 1 of the device is turned on, a device main body power supply voltage 5V is impressed to the other input ends of the two AND gates 2a. When the power source of the main body of the device is turned on and the power source of the peripheral equipment 4 or 5 is turned OFF, any one of the peripheral equipment power supply signals DCN is turned to a low level and the signal level of an alarm signal ALM at the output end of an AND gate 2b is made low. Then, the alarm is raised to announce it to a worker that the power source of the peripheral equipment 4 or 5 is forgotten for turning on, by ringing a buzzer 3a. Thus, the power source of the peripheral equipment is prevented from being missed to be turned on.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a power supply monitoring circuit for a system consisting of an apparatus main body and peripheral equipment.

[Conventional technology]

Conventionally, this type of power monitoring circuit did not exist, and for peripheral devices that are supplied with power from sources other than the power output terminal of the device, it is possible for an operator to forget to turn on the peripheral device when turning on the power to the device. The only way to do this is to either prevent it from happening, or use the software to detect when the peripheral device is powered off.

[Problem to be solved by the invention]

The conventional power supply monitoring circuit for the above-mentioned system consisting of the main body of the device and peripheral devices was not particularly provided, so it was necessary to ensure that the operator did not forget to turn on the power of the peripheral devices when turning on the power of the main body of the device. Alternatively, the only way to detect whether a peripheral device is powered off is through the software used in this system, and if a worker forgets to turn on the power, the worker will have to turn on the peripheral device during work. , which has the disadvantage that business operations are interrupted.

Therefore, the present invention solves the above-mentioned drawbacks and, in the unlikely event that a worker forgets to turn on a peripheral device when turning on the power to the main body of the device, detects the power off state of the peripheral device. To provide a power supply monitoring circuit which generates a detection signal, issues an alarm in response to the detection signal to make a worker aware of forgetting to turn on the power, and immediately turns on the forgotten power supply.

[Means to solve the problem]

The power monitoring circuit of the present invention is a power monitoring circuit for a peripheral device to which power is supplied from a source other than the ti power output terminal of the device main body, wherein the power of the device main body is in an on state, but the power of the peripheral device is in an off state. It has a circuit that detects this OFF state and generates a detection signal when it is in the off state, and a circuit that issues an alarm in response to the detection signal.

[Effect]

In this way, even if the main unit's power is on, if the power of the peripheral equipment is off, the power monitoring circuit detects this on state and generates a detection signal, and this detection signal Since an alarm is issued in response, the worker can immediately turn on the power to peripheral devices and begin work without interrupting the work.

(Example) Next, an example of the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram of an embodiment of a power supply monitoring circuit according to the present invention. The device main body 1 of this embodiment is a personal computer. The peripheral device power state signal DCN from the peripheral device 4.5 is connected to the input terminals of two AND gates 2a of the peripheral device power state detection circuit 2, respectively. This 2
When the device main body 1 is powered on, the device main body power supply voltage +5V is applied to the other input terminal of the two AND gates. Each output of AND gate 2a is
There are two inputs for b. The output terminal of AND gate 2b is
It is connected to the control input terminal of the buzzer 3a of the alarm circuit 3 as an alarm signal ALM. A power supply voltage of +5 V for the main body of the apparatus is separately applied to the buzzer 3a, and the buzzer 3a sounds when the control input terminal becomes low level.

The power supply monitoring circuit of this embodiment includes a peripheral equipment power state detection circuit 2 and an alarm circuit 3.

Next, the operation of this embodiment will be explained.

In FIG. 1, when the device main body 1 is powered on and the peripheral device 4 or 5 is powered off, one of the peripheral device power status signals DCN output from the two peripheral devices 4 and 5. becomes a low level, and the output of the AND gate 2a to which this low level peripheral device power state signal DCN is input is a low level, and the output of the other AND gate 2a becomes a high level and is input to the AND gate 2b. Therefore, the signal level of the alarm signal AI-M at the output terminal of the AND gate 2b also becomes low level, so that the buzzer 3a can sound and issue an alarm to notify the operator that the peripheral device 4 or 5 has forgotten to be turned on. become.

On the other hand, if peripheral devices 4 and 5 are both powered on, 2
The two peripheral device power state signals DCN both become high level, and therefore the alarm signal ALM becomes high level, so the buzzer 3a does not sound.

In the above embodiment, the buzzer 38 is used as the alarm, but it is also possible to use a display or the like.

〔Effect of the invention〕

As explained above, the present invention detects this state and issues an alarm when the power of a peripheral device that is supplied with power from a source other than the power output terminal of the device main body is in the OFF state while the IAM main body is powered on. This allows workers to be notified if they have forgotten to turn on peripheral devices, making it possible to eliminate forgetting to turn on peripheral devices at the start of work, and eliminate situations where workers turn on peripheral devices in the middle of work. This has the effect of eliminating the disadvantage of business interruption.

[Brief explanation of drawings]

FIG. 1 is a block diagram of an embodiment of a power supply monitoring circuit according to the present invention. 1...-Device body, 2... Peripheral device power state detection circuit, 2a, 2b... AND gate, 3... Alarm circuit, 3a... Buzzer 4.5... Peripheral device, DCN. ...Peripheral equipment power status signal, AIM...Alarm signal, +5V...Device main power supply voltage.

Claims (1)

[Claims] 1. In a power monitoring circuit for a peripheral device to which power is supplied from a source other than the power output terminal of the device main body, when the power of the device main body is in the on state but the power of the peripheral device is in the off state, this off state What is claimed is: 1. A power source monitoring circuit comprising: a circuit that detects a signal and generates a detection signal; and a circuit that issues an alarm in response to the detection signal.