JPH09322429A - Backup processing circuit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily supply a backup power source line with a backup power source voltage for a long time. SOLUTION: A second control circuit 14 operates by the DC power source voltage from a backup power source line 22, and supplies an external record medium 15 with a signal required for data processing and recording. The second control circuit 14 turns off the first to the power source switches 21-1, 21-2∼21-n, and a data switch 17, in case that the detection signal from a power source detection circuit 12 shows the cut of input, and stops new data output to the external recording medium 15, and outputs signals required for data processing and recording successively so that the data outputted before it may be processed in the external recording medium 15 and that it may be recorded in the memory of the external recording medium 15.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a backup processing circuit provided in an apparatus for recording data to be stored in an external recording medium based on a predetermined protocol by using an AC power source as a power source, and particularly from an AC input power source. The present invention relates to a backup processing circuit that can perform backup for a long time when the input of is disconnected.

[0002]

2. Description of the Related Art Conventionally, most devices for digital signal processing, which require an external recording medium represented by a security IC card, perform recording based on a protocol determined for the external recording medium to be connected. It supplies the data and the signals required to process and record this data. Many external recording media need to be supplied with a stable power supply and signals necessary for data processing and recording based on a predetermined protocol until input data is processed and stored in the memory. In such a device, if the supply of the necessary signals cannot be ensured, there is a risk that the operation may be hindered due to data destruction.

That is, in such a device, the AC input power is cut off during the time until the external recording medium processes the data and is recorded in the memory, so that the external recording medium is supplied with power and a predetermined amount. In some cases, the supply of signals based on the protocol could not be secured, resulting in data corruption.

In response to this, a backup processing circuit has been developed which prevents data destruction due to disconnection of the AC input power source.

FIG. 2 is a block diagram showing such a conventional backup processing circuit.

In FIG. 2, reference numeral 51 is an AC power supply input plug connected to an AC power supply, and a pair of wires of this AC power supply input plug 51 is connected to a power supply circuit (not shown) and to a power supply detection circuit 52. To be done. In this case, the power supply circuit has a circuit that converts an AC input power supply voltage from the AC power supply input plug 51 into a DC power supply voltage and outputs the DC power supply voltage, and also has a backup power supply circuit. The backup power supply circuit charges with the DC power supply voltage, discharges when the input of the AC input power supply voltage is cut off, and outputs the backup power supply voltage to the backup power supply line. The DC power supply voltage is controlled by the control circuit 53,
External recording medium 54, first to nth clock generator 61
-1, 61-2 ... 61-n and first to nth circuits 63
-1, 63-2 ... 63-n.

The power supply detection circuit 52 detects whether or not the input from the AC input power supply is cut off, generates a detection signal a2 of the detection result and supplies it to the control circuit 53.

The control circuit 53 uses the DC power supply voltage from the power supply circuit and outputs the data to be stored from the data input to the external recording medium 54 based on a predetermined protocol. , External recording medium 5
4 is supplied with signals necessary for data processing and recording based on a predetermined protocol.

First to nth clock generators 61-1 and
61-2 ... 61-n are respectively the first to n-th circuits 6
3-1, 63-2 ... 63-n are adapted to generate clock signals, and the first to n-th power switches 62-1 and 62-
2 ... 62-n through the first to n-th circuits 63, respectively
-1, 63-2 ... 63-n are supplied. Control circuit 53
Is the detection signal a2 output from the power supply detection circuit 52.
Indicates that the input is cut off, control is performed to turn off the first to n-th power supply switches 62-1, 62-2 ... 62-n.

In such a conventional digital device, when the control circuit 53 monitors the power source detection circuit 52 and determines that the AC input power source is cut off, a circuit not related to data processing and recording on the external recording medium 54. 63-1, 63-2 ...
The clock supply to 63-n is stopped. As a result, the current consumption is reduced, and the time required until the data captured by the external recording medium 54 is processed by the backup power supply and recorded in the memory, a stable power supply and a signal necessary for data processing and recording based on a predetermined protocol. Enables the supply of.

On the other hand, as another conventional technique, the control circuit monitors the detection circuit of the AC input power supply, and when it judges that the AC input power supply is cut off, instructs the power supply circuit to stop the power supply to unnecessary power supply lines. By doing so, the current consumption is reduced.

FIG. 3 is a block diagram showing a conventional digital device for turning on / off such a power supply circuit.

In FIG. 3, reference numeral 71 is an AC power supply input plug connected to an AC power supply. A pair of wires of the AC power supply input plug 71 are connected to a power supply circuit 80 and a power supply detection circuit 72. It In this case, the power supply circuit 80 converts the AC input power supply voltage from the AC power supply input plug 71 into a DC power supply voltage, and inputs the first to nth power supply switches 81-1, 81-2 ... 81-n and A desired DC power supply voltage adapted to each backup power supply line 82 is introduced.

First to nth power switches 81-1 and 8-1
The output terminals of 1-2 ... 81-n are respectively the first to nth output terminals.
Through the power supply lines 83-1, 83-2 ... 83-n of the external recording medium 74
To nth circuits and clock generators (not shown) corresponding to these circuits. The backup power supply line 82 is connected to the control circuit 73, the external recording medium 74, and other circuits related to data processing and recording in the external recording medium 74.

The power supply detection circuit 72 detects whether or not the input from the AC input power supply is cut off, generates a detection signal a3 of the detection result, and supplies it to the control circuit 73.

The control circuit 73, if the detection signal a3 output from the power supply detection circuit 72 does not indicate disconnection of the input, the first to nth power supply switches 81-1 and 81-2.
The control signal c3 for turning on 81-n is supplied to the power supply circuit 80, and at the same time, the data to be saved from the input data is output to the external recording medium 74 based on the determined protocol. , A signal necessary for data processing and recording based on the protocol is supplied to the external recording medium 74.

The control circuit 73, when the detection signal a3 output from the power supply detection circuit 72 indicates disconnection of the input,
First to nth power switches 81-1, 81-2, ... 81
At the same time as supplying the control signal c3 for turning off -n to the power supply circuit 80, new data output to the external recording medium 74 is stopped, and the data output before that is output to the external recording medium 74.
Then, the signals necessary for data processing and recording based on a predetermined protocol are continuously output so that the signals are processed by the above and recorded in the memory of the external recording medium 74.

In such a conventional digital device, the control circuit 73 monitors the power source detection circuit 72 of the AC input power source,
When it is determined that the AC input power is cut off, turning off the first to nth power switches 81-1 81-2 ... 81-n does not affect the storage in the memory of the external recording medium 74. All power supply lines 83-1 and 83-
2 ... Disconnects the output of 83-n. At the same time, new data output to the external recording medium 74 is stopped, and data output before that is continuously processed according to a predetermined protocol so that the data is processed by the external recording medium 74 and recorded in the memory of the external recording medium 74. Output signals required for data processing and recording. Only the backup power supply line 82 is supplied with DC power at this point, and at least the control circuit 73, the external recording medium 74, and circuits related to data processing and recording on the other external recording medium are powered by the backup power supply line. It is supplied from 82.

According to the above sequence, when the AC input power supply is cut off, the supply of the power supply voltage to the extra circuit is cut off, and only the circuit connected to the backup power supply line is operated, so that the current consumption is reduced. Compared with the above, it is possible to supply power to the backup power supply line for a long time from the time when the AC input power is cut off, and it is not necessary to increase the capacitance for supplying power to the backup power supply line.

As described above, in the conventional backup processing circuit shown in FIGS. 2 and 3, the control circuit controls the backup power supply for the time until the data taken in by the external recording medium is processed and recorded in the memory. The line enables stable power supply, but in recent years, the current consumption of the control circuit itself has increased due to the large capacity of the processor and so on. It is becoming difficult to supply backup power for a long time.

[0021]

As described above, in the conventional backup processing circuit, the backup power supply line controls the time taken to process the data taken in by the external recording medium and record it in the memory under the control of the control circuit. Makes it possible to supply a stable power supply voltage.
In recent years, the current consumption of the control circuit itself has increased due to the increased capacity of the processor, etc., so it has become difficult to supply the backup power supply voltage to the backup power supply line for a long time after the AC input power supply is cut off. There is.

Therefore, an object of the present invention is to provide a system capable of easily supplying a backup power supply voltage to a backup power supply line for a long time.

[0023]

A backup processing circuit according to claim 1 is a backup processing circuit provided in a device for recording data to be stored in an external recording medium based on a predetermined protocol, and an alternating current A power supply circuit supplied with an input power supply voltage and capable of outputting a DC power supply voltage and a backup power supply voltage; and a backup power supply line supplied with the backup power supply voltage from the power supply circuit,
A second to which the DC power supply voltage from the power supply circuit is supplied
And a first control circuit that operates by the DC power supply voltage from the second power supply line and outputs the data to be stored to the external recording medium, and the data output from the first control circuit. It is provided in the path to supply to the external recording medium and turns on the supply of the data to the external recording medium.
The data switch to be turned off and the power supply circuit to
A power switch for turning on / off the supply of the DC power supply voltage to the power supply line, a power supply detection circuit for detecting whether or not the input from the AC input power supply is disconnected, and generating a detection signal, and the backup power supply line Of the backup power supply voltage and the detection signal output from the power supply detection circuit indicates disconnection of the input, the data switch and the power supply switch are turned off, and the external recording medium is operated based on the protocol. A second control circuit for outputting a signal required for data processing and recording.

According to the structure of claim 1, when the input of the AC power supply voltage is cut off, the data switch is turned off, and the supply of the data from the first control circuit to the external recording medium is stopped, Since the supply of the power supply voltage to the circuit that does not require the power switch is turned off, and the second control circuit outputs a signal necessary for data processing and recording to the external recording medium, the backup power supply line is connected to the backup power supply line. The voltage can be easily supplied for a long time.

[0025]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram showing an embodiment of an invention of a backup processing circuit according to the present invention, which is applied to a digital device.

In FIG. 1, reference numeral 11 is an AC power supply input plug connected to an AC power supply, and a pair of wirings of this AC power supply input plug 11 are connected to a power supply circuit 20 and a power supply detection circuit 12. It The power supply circuit 20 includes first to nth power supply switches 21-1, 21-2 ...
21-n are provided. The power supply circuit 20 converts the AC input power supply voltage from the AC power supply input plug 11 into a DC power supply voltage, and the first to nth power supply switches 21-1 and 21-21.
-2 ... 21-n through a plurality of power supply lines 23-1, 2
3-2 ... 23-n and a desired DC power supply voltage is led to the backup power supply line 22.

The power supply lines 23-1, 23-2 ... 23
-N is connected to the first to nth circuits (not shown).
The first to n-th circuits are circuits that are not related to data processing and recording on the external recording medium 15, and include a clock generator and the like. In addition, the nth power supply line 23
-N is connected to the first control circuit 13. The backup power supply line 22 is connected to the second control circuit 14, the external recording medium 15, the clock generator 16, and other circuits related to data processing and recording in the external recording medium 15.

With such a configuration, the power supply line 23-
A normal DC power supply voltage is supplied to 1, 23-2 ... 23-n, and a backup power supply line 22 is supplied with a backup voltage.

The first control circuit 13 has a power supply line 23-
It operates by the DC power supply voltage from n, and outputs the data to be stored in the external recording medium 15 from the input data based on the determined protocol.

The data output from the first control circuit 13 is connected to the input terminal of the external recording medium 15 via the data switch 17, and the data switch 17 stores the data from the first control circuit 13 in the external recording. The supply to the medium 15 is turned on / off.

The clock generator 16 operates by the DC power supply voltage from the backup power supply line 22, and the second
The control circuit 14 is supplied with a clock signal as a reference for operation.

The power supply detection circuit 12 detects whether or not the input from the AC input power supply is cut off, generates a detection signal a1 of this detection result, and supplies it to the second control circuit 14.

The second control circuit 14 consumes less current than the first control circuit 13 and uses the DC power supply voltage from the backup power supply line 22 for data processing and recording based on a predetermined protocol. The necessary signal is supplied to the external recording medium 15. In addition, the second control circuit 14
Is the detection signal a1 output from the power supply detection circuit 12.
Control signal b1 for turning on the first to n-th power switches 21-1, 21-2 ... 21-n to the power circuit 20 and simultaneously turning on the data switch 17 The signal c1 is supplied. further,
When the detection signal a2 output from the power supply detection circuit 12 indicates disconnection of the input, the second control circuit 14 turns off the first to nth power supply switches 21-1, 21-2 ... 21-n. At the same time as supplying the control signal b1 for controlling the power supply circuit 20, the control signal c1 for turning off the data switch 17 is supplied to stop the output of new data to the external recording medium 15 by the first control circuit 13. Here, the second control circuit 14 has a function of outputting various signals such as a clock and a reset based on a predetermined protocol so that the data is recorded in the memory of the external recording medium 15, and the first to nth power supplies. 21-n and the switches 21-1, 21-2 ... 21-n and the data switch 17 have only to be turned on / off, and thus can be configured with low current consumption.

The operation of this embodiment of the invention will be described.

In the normal case where the AC power supply voltage is stably supplied from the AC power supply input plug 11, the power supply detection circuit 12 detects that the input from the AC power supply has not been cut off. As a result, the second control circuit 14
Are the first to n-th power switches 21-1, 21-2 ...
21-n and the data switch 17 are turned on. As a result, the DC power supply voltage is supplied from the power supply circuit 20 to the first control circuit 13 via the nth power supply line 23-n, and the data from the first control circuit 13 is supplied to the external recording medium 15 for recording. At the same time, the power supply circuit 20 supplies a DC voltage to the first to n-th power supply lines 23-1, 23-2 ... 23-n. In such a state, the device operates normally.

When the AC power supply voltage is disconnected from the AC power supply input plug 11 due to a power failure or the like, the power supply detection circuit 1
2 generates a detection signal indicating that the input from the AC input power supply is disconnected. As a result, the second control circuit 14 causes the first to nth power switches 21-1 and 21-21.
2 ... 21-n and the data switch 17 are turned off. As a result, the power supply circuit 20 is connected to the first to nth power supply lines 2
The power supply voltage is no longer supplied to 3-1, 23-2, ..., 23-n, and the first to nth circuits that are not related to data processing and recording of the external recording medium 15 stop operating. On the other hand, the data of the first control circuit 13 is no longer supplied to the external recording medium 15, but here, the second control circuit 14 determines until the external recording medium 15 determines that the AC input power is cut off. So that the processed data can be processed and the processed data can be recorded in the memory of the external recording medium 15.
Various signals necessary for data processing and recording such as clock and reset are continuously output to the external recording medium 15 based on a predetermined protocol. This prevents data destruction. Only the backup power supply line 22 is supplied with DC power at this point, and the second control circuit 14, the external recording medium 15 and the other external recording medium 15 are supplied.
The backup power supply voltage is supplied from the backup power supply line 22 to the power supply of the circuit related to the data processing and recording in the above. Since the power supply of the first control circuit 13 which requires a large current consumption for data processing and system control of equipment is not supplied from the backup power supply line 22, the current consumption in the circuit connected to the backup power supply line 22 is It's getting less.

As described above, according to the embodiment of the present invention, when the input of the AC power supply voltage is cut off, the data switch 17 is turned off, and the first control circuit 13 is turned off.
21-n by stopping the supply of data from the external recording medium 15 to the external recording medium 15 and turning off the power switches 21-1, 21-2 ... 21-n. Stop supplying DC power supply voltage. At this time, the first
Second control circuit 1 which consumes less current than the control circuit 13 of
4 outputs signals required for data processing and recording to the external recording medium 15, so that the backup power supply voltage can be easily supplied to the backup power supply line for a long time, and these control circuits can be provided by increasing the capacity of the processor. Even if the current consumption of the data increases, it is possible to sufficiently prevent the data from being destroyed when the AC power supply voltage is cut due to a power failure or the like.

The external recording medium 15 in the embodiment of the invention shown in FIG. 1 can be applied in various ways such as a security IC card.

[0040]

As described above, according to the present invention, the backup power supply voltage can be easily supplied to the backup power supply line for a long time, and even if the current consumption of the control circuit increases due to the increase in the capacity of the processor, the AC Data can be sufficiently prevented from being destroyed when the power supply voltage is cut due to a power failure or the like.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of an invention of a backup processing circuit according to the present invention.

FIG. 2 is a block diagram showing a first conventional backup processing circuit.

FIG. 3 is a block diagram showing a second conventional backup processing circuit.

[Explanation of symbols]

11 AC Power Supply Input Plug 12 Power Supply Detection Circuit 13 First Control Circuit 14 Second Control Circuit 15 External Recording Medium 16 Clock Generator 17 Data Switch 20 Power Supply Circuit 21-1, 21-2 ... 21-n 1st to 1st n power switch 22 backup power supply line 23-1, 23-2 ... 23-n power supply line

Claims (1)

[Claims] 1. A backup processing circuit provided in a device for recording data to be stored in an external recording medium based on a predetermined protocol, wherein an AC input power supply voltage is supplied, and a DC power supply voltage and a backup power supply voltage are provided. A power supply circuit capable of outputting the power, a backup power supply line to which the backup power supply voltage is supplied from the power supply circuit, and a second power supply voltage to which the DC power supply voltage is supplied from the power supply circuit
And a first control circuit that operates by the DC power supply voltage from the second power supply line and outputs the data to be stored to an external recording medium, and the data output from the first control circuit. A data switch provided on a path for supplying the external recording medium to turn on / off the supply of the data to the external recording medium, and to turn on a direct-current power supply voltage from the power supply circuit to the second power supply line. A power switch that turns off, a power detection circuit that detects whether or not the input from the AC input power supply is disconnected, and a detection signal that is generated, and that operates by a backup power supply voltage from the backup power supply line. When the detection signal output from indicates the disconnection of the input, the data switch and the power switch are turned off, and the external recording medium is Backup processing circuit, characterized by comprising a second control circuit for outputting a signal necessary for data processing and recording on the basis of the serial protocol.