JPS61164437A - Interruption compensator - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a power outage compensating device for backing up memory and the like in the event of a momentary power outage.

[Prior Art] Conventionally, whether or not to back up the contents of a memory such as a RAM using a backup power source such as a battery has been selected by manually turning on and off a backup switch provided between the memory and the backup power source. was.

[Problems to be Solved by the Invention] However, with this method, if there is an unexpected momentary power outage (momentary power outage) when the backup switch is off, backup will not be performed and the memory contents will be destroyed. Put it away. In particular, if there are many setting parameters for industrial meters or other instruments, resetting them is difficult. Furthermore, if a momentary power outage occurs when no one is present, such as during continuous operation at night, there is a risk that the entire system will go down.

An object of the present invention is to address the above points and provide a power failure compensation device which performs backup in the event of a II outage regardless of the selected state of the backup switch, and which significantly improves the reliability of the device. .

[Means for Solving the Problems] The present invention includes a backup switch that selects whether or not backup is performed using a backup power source, and a system that determines whether the power switch is on or off when the power supply drops and turns the power switch on. This power failure compensation device is equipped with a processing device that turns on the backup switch to perform backup regardless of the state of the backup switch when the power switch is off, and a processing device that follows the on/off state of the backup switch when the power switch is off.

[Embodiment of the Invention] FIG. 1 is a configuration explanatory diagram showing an embodiment of the present invention.

In the figure, 1 is a processing device such as a microcomputer that performs predetermined arithmetic processing according to the contents of a memory 2 including ROM, RAM, etc., and 3 is a backup power source such as a battery for backing up the memory 2, etc. ,
4 is a device power source that rectifies the voltage of AC power source 5 and supplies power to each circuit of the device; 6 is a detection circuit that detects disconnection or reduction of AC power source 5 or W1 power source 4; Sl is memory 2;
and the backup power source 3, the first backup switch is manually turned on and off to select whether to back up or not, and S2 is a second backup switch that is turned on and off by a signal from the processing device 1. , S3 is a power switch provided between the AC power source 5 and the device power source 4, $4 is turned on and off in conjunction with the power switch S3, and is used to detect the on/off state of the power switch $3. This is a detection switch. Note that the first and second backup switches S1. S2 may be only one backup switch S1.

Next, the operation will be explained with reference to FIG.

First, the first backup switch S1 is turned on or off depending on whether to back up or not. Also, the power switch $3 is either on or off.

When the detection circuit 6 detects a decrease in the power supply and generates a detection signal, the processing device 1 checks the on/off state of the detection switch $4 and determines whether the power switch S3 is on or off. When the power switch S3 is on, it is determined that there is a power outage, and the first
Regardless of the on/off state of the backup switch S1, the second backup switch S2 or one backup switch S1 is turned on to prevent the contents of the memory 2 from being destroyed due to a momentary power outage. Further, since the power switch S3 was turned off artificially when it was off, it is not a power outage and backup is not performed forcibly, but backup is performed according to the on/off state of the backup switch S1.

[Effects of the Invention] This invention ensures that backup is performed when the power drops while the power switch is on, so even if a momentary power outage occurs when the backup switch is off, the memory contents will not be destroyed. , the operation of the device can be ensured, and reliability is greatly improved.

[Brief explanation of the drawing]

FIGS. 1 and 2 are configuration explanatory diagrams showing one embodiment of the present invention. DESCRIPTION OF SYMBOLS 1... Processing device, 2... Memory, 3... Backup power supply, 4... Device power supply, 5... AC power supply, 6... Detection circuit, Sl, S2... Backup switch, S3...Power switch, S4...
detection switch brass

Claims (1)

[Claims] 1. A backup switch that selects whether or not to back up with a backup power source, and a backup switch that determines whether the power switch is on or off when the power drops, and when the power switch is on, it is determined that there is a power outage and the backup switch is turned on or off. A power outage compensation device characterized by comprising: a processing device that performs backup by turning on a backup switch regardless of an off state, and follows the on/off state of the backup switch when a power switch is off.