JPS6281940A - Digital device - 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 digital device such as an electronic calculator having a power failure compensation means.

[Conventional technology]

FIG. 2 is a block connection diagram showing a conventional digital device. In the figure, 1 is a digital device, 10 is a power converter, 101 is, for example, an AC 100 V, 50 Hz commercial power source, and 102 is a DC output of the power converter 10. be.

Next, the operation will be explained. First, by turning on a power switch or the like, the commercial power source 101 is converted into DC by a rectifier that is a power converter 10 installed in the digital device 1 to, for example, 12V DC, and this is supplied to each circuit section of the digital device 1. Therefore, the digital device 1 operates according to a predetermined program to perform calculations, processing, etc. on data for a certain purpose.

By the way, since the digital device 1 sequentially processes data while reading the program stored in the storage unit, if the commercial power supply 101 is interrupted, normal operations based on the program cannot be performed during that time.) Therefore, even after the power is restored, the data processing operation remains stopped, and there is a problem that abnormal operation occurs, for example, the circuit goes into a runaway state.

For this reason, in recent years, a third device is installed outside the digital device 1.
As shown in the figure, an uninterruptible power supply device 2 having a rectifier circuit 21, a storage battery 22 and an inverter circuit 23 is installed,
During a power outage of the commercial power supply 101, DC voltage is supplied from the storage battery 22 to the inverter circuit 23, and the inverter circuit 23
There is a device that supplies a DC-AC converted voltage to the power converter 10. According to this, the commercial power supply 101
Even if there is a power outage, the power can be continued to be supplied to the digital device 1 through the inverter 23 due to the discharge output of the storage battery 22. Therefore, it is possible to effectively prevent abnormalities and runaway operations due to power outages.

[Problem that the invention seeks to solve]

Since the conventional digital device 1 is configured as described above, a costly uninterruptible power supply 2 must be prepared separately from the digital device as a circuit for compensating for a power outage for the digital device 1, resulting in unnecessary costs. Become an economy. Further, the uninterruptible power supply 2 usually has a complicated waveform shaping circuit in order to output a sinusoidal alternating current voltage, which inevitably increases costs and causes problems such as a decrease in efficiency.

The present invention was made to solve the above-mentioned problems, and an object of the present invention is to provide a digital device that can cope with short-term power outages and has a simpler and more compact configuration.

[Means for solving problems]

The digital device according to the present invention includes a rectifier circuit that rectifies a commercial power supply voltage, a storage battery for short-term power outage compensation that charges the output of the rectifier circuit, and a DC-DC converter circuit that converts the output of the rectifier circuit from DC to DC. The power converter is configured such that the storage battery can continue to supply DC voltage during a power outage of the commercial power source.

[For production]

The power converter in this invention has a storage battery that rectifies and charges commercial power, and this is useful in terms of power system operation, in view of the fact that there are no long-term power outages due to the improved reliability of today's commercial power. Small-capacity batteries are used to deal with short-term power outages. Further, this storage battery can be housed integrally and compactly in a digital device together with a rectifier circuit and a DC-DC converter, which is advantageous in terms of economy and space.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings. In Fig. 1, 11 is a rectifier circuit for rectifying commercial power;
12 is a small capacity storage battery that charges rectified DC power,
It has enough capacity to handle short power outages. Reference numeral 13 denotes a DC-DC converter that once converts the DC obtained by the rectifier circuit 11 into AC and then converts the AC into DC again.

These rectifier circuit 11, storage battery 12, and DC-DC converter 13 constitute a power converter 10A.

Next, the operation will be explained.

First, the commercial power supply 101 is rectified in the rectifier circuit 11,
DC power is floatingly charged to the storage battery 12. At the same time, the DC power is input to a DC-DC converter to obtain a required stable DC output at a constant level, which is then supplied to the circuits of each part of the digital device 1.

Next, the operation will be explained. In such a circuit, if there is not a long-term power outage that exceeds the capacity of the storage battery 12, but a very short power outage that occurs for the protection and operation of the power system, it is possible to charge the battery sufficiently before the power outage occurs. The discharged power of the storage battery 12 is continuously supplied to the DC-DC converter 13 after the power outage and until the power outage is restored and normal commercial power supply 101 is started. Therefore, the digital device 1 can continue to operate normally based on the program stored in the storage section, and the circuit runaway that occurs in the prior art can be prevented. Furthermore, since the storage battery 12 only needs to have a small capacity, it can be easily assembled into the digital device 1. moreover,
It is possible to reduce the number of incidental equipment without increasing the size of the digital device 1, and the overall design can be made compact.

〔Effect of the invention〕

As described above, according to the present invention, a storage battery that can cope with short-term power outages and a configuration in which the output of this storage battery is supplied to a DC-DC converter for obtaining a stabilized DC voltage, so that commercial power is For example, even if there is a power outage for about 10 seconds, the storage battery can continue to stably supply DC voltage at a constant level to each part of the digital device through the DC-DC converter.Also, since the storage battery has a small capacity, the power changing section can be The advantage is that it can be made smaller and can be easily installed in a digital device.

[Brief explanation of drawings]

FIG. 1 is a block connection diagram of a digital device according to an embodiment of the present invention, and FIGS. 2 and 3 are block connection diagrams of a conventional digital device. 1 is a digital device, IOA is a power converter, 11 is a rectifier circuit, 12 is a storage battery, 13 is a DC-DC converter, 101
is commercial power supply. In addition, in the figures, the same reference numerals indicate the same or equivalent parts. Procedure Written amendment (voluntary) Special j,! , :Dear Commissioner of the Agency ■, Small Case Display Patent Application No. 1983-220524 2,
Name of the invention: Digital device 3. Representative of the person making the amendment: Mamoru Shiki, late 5. Detailed description of the invention in the specification to be amended.・]π) 6. Revise the self-answer details 11t of the amendment as per 7H.

Claims (1)

[Claims] In a digital device that has a power converter that converts a commercial power supply into DC and operates using this DC-converted voltage as a power source, the power converter includes a rectifier circuit that rectifies the commercial power supply voltage and a floating charger that converts the output of the rectifier circuit into a DC voltage. A storage battery for short-term power outage compensation, and a DC-DC conversion circuit for converting the output of the rectifier circuit from DC to DC, respectively, so that the storage battery continues to supply DC voltage during a power outage of the commercial power supply. A digital device featuring: