JPH11259376A - Backup device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a backup device capable of reducing power consumption during the reservation standby of utilizing equipment. SOLUTION: A voltage detecting circuit 4 detects a supplied voltage and when the detected voltage is lower than a certain fixed value, stored information in a main microcomputer 6 is transferred to a sub microcomputer 7 of a low power consumption. The sub microcomputer 7 holds this information under the backup of a battery 9 to control charging/discharging through the detecting signal of the voltage detecting circuit 4. When the detected voltage gets higher than a certain fixed value, the stored information in the sub microcomputer 7 is transferred to the main microcomputer 6. Based on held reservation information, the sub microcomputer 7 operates a semiconductor switch, supplies power to a device and enables reservation operation at the main microcomputer 6.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a microcomputer backup device for controlling a device to be used in the event of a power outage or power-off, and more particularly, to a power outage in a device to be used, for example, a device having a recording reservation function. Or when the power supply on the primary side is stopped by a semiconductor switch,
By transferring the recording reservation information stored in the main microcomputer with high power consumption and the storage information such as device setting information to the sub-microcomputer with low power consumption and clocking function that can be instantaneously driven by battery, in the event of power failure Power supply is resumed at the reserved time based on the reserved storage information transferred under the control of the sub-microcomputer, and the reserved storage information is transferred to the main microcomputer again. After that, the present invention relates to a backup device that attempts to perform a normal operation.

[0002]

2. Description of the Related Art A conventional technique will be described with reference to FIG. In the figure, reference numeral 1 denotes an AC outlet, 3 denotes a power supply circuit, and a power failure detection circuit 4 'for transmitting a signal at the time of a power failure is provided at a power supply secondary output, and 6' is a main microcomputer for controlling the recording circuit 5. When a power failure or the AC outlet 1 is unplugged for some reason in a device constituted by a cut-off switch 13 and a backup capacitor 14 installed on the power supply line of the main microcomputer 6 ', the power failure detection circuit 4' detects this. Then, a signal is transmitted to the main microcomputer 6 'and the cutoff switch 13. The main microcomputer 6 'suppresses the control by the signal to reduce the power consumption, and the cutoff switch 13 opens the power supply line to release the backup capacitor 1
4 is switched to the power supply. As a result, the main microcomputer 6 'can hold recording reservation information, a built-in clock, and device setting information by supplying power from the backup capacitor 14 for a short time. When the power is restored within the backup time, the operation shifts to the normal operation while the above-mentioned stored information is retained. If the power is restored within the backup time even if a power failure occurs during the recording reservation, the reservation can be executed after the power is restored.

[0003]

However, in the prior art, there is a danger that all the stored information will be erased in the case of a long-time power failure due to the short-time backup. Further, although the control is suppressed, the power consumption in the main microcomputer is also a factor for shortening the backup time. The present invention has been made in view of the above situation, and transfers stored information to a backup microcomputer (sub-microcomputer) that consumes much less power than the main microcomputer when shifting to a power failure state, and uses a rechargeable battery. By backing up the sub-microcomputer, it is possible to back up for a long time, and by adopting a battery that can charge standby power, it is possible to reduce power consumption during power failure and standby when power is turned off, and based on stored information An object to be solved is to provide a backup device that operates so as to restart power supply.

[0004]

According to the first aspect of the present invention, there is provided a microcomputer which controls a device to be used, a voltage for outputting a signal when a DC voltage supplied from an external power supply becomes lower than a certain value or higher than a certain value. In a backup device including a detection circuit and backup means for backing up the microcomputer by a detection signal of the voltage detection circuit, the backup means includes a backup microcomputer that consumes less power than the microcomputer, and a backup battery. When the voltage detection circuit detects a voltage lower than a certain value, the stored information in the microcomputer is transferred to the backup microcomputer using the power of the backup battery, and the voltage detection circuit is higher than a certain value. When a voltage is detected, the power is supplied from the external power A backup device characterized by forming means for transferring to said microcomputer storing information up for the microcomputer.

According to a second aspect of the present invention, in the backup device according to the first aspect, the backup battery is charged by a DC voltage supplied from the external power supply, and the charging and discharging of the backup battery is performed by a detection signal of the voltage detection circuit. The backup device is switched based on the following.

According to a third aspect of the present invention, in the backup device according to the first or second aspect, a backup capacitor for the microcomputer is separately provided, and the backup capacitor is provided when the voltage detection circuit detects a voltage lower than a predetermined value. A backup device for transferring the stored information in the microcomputer to the backup microcomputer.

According to a fourth aspect of the present invention, in the backup device according to any one of the first to third aspects, the backup microcomputer further comprises a switch for supplying / cutting power from the external power supply to the backup device. A backup device characterized in that the switch is controlled by:

According to a fifth aspect of the present invention, in the backup device according to the fourth aspect, the switch is a semiconductor switch, the semiconductor switch is provided on a primary side for the external power supply, and the semiconductor switch is provided on a secondary side for the external power supply. A backup device provided with a voltage detection circuit.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An outline of an embodiment of a backup device according to the present invention will be described by taking a recording reservation device as an example. For devices equipped with a recording reservation function, a semiconductor switch that controls the power supply to the primary side of the power supply from the secondary sub-microcomputer (backup microcomputer), and the state of the primary-side power supply circuit from the output voltage of the secondary side The voltage from the voltage detection circuit at the time of a power failure or when the semiconductor switch is opened can be used to charge the recording reservation information and setting information stored in the main microcomputer that are backed up for a short time by the backup capacitor. Transfer to the sub-microcomputer having a clock function backed up by a simple battery, and at the reserved time, the sub-microcomputer turns on the semiconductor switch to restart the power supply, and the recording reservation information is again transmitted to the main microcomputer. Transfer to
It provides a function for executing scheduled recording.

A basic operation of the recording reservation apparatus which is an example of the embodiment of the present invention will be described with reference to FIG. When a power-off signal is input from the power switch 11 or the remote control light receiving unit 10 in a state in which the recording reservation is set, the sub-microcomputer 7 opens the semiconductor switch 2 provided on the primary side of the power supply to stop the power supply. . At this time, the voltage detection circuit 4 provided on the secondary side output senses this and transmits a signal to each circuit. With this signal, the sub-microcomputer 7 can charge the rechargeable battery 9
Thus, the main microcomputer 6 is backed up by the backup capacitor 14 that can supply power for a short time. While the main microcomputer 6 is backed up for a short time, the recording reservation information and each setting information stored in the main microcomputer 6 are transferred to the sub microcomputer 7. The sub-microcomputer 7 retains this information under backup of the battery 9 and compares the built-in clock function with the reservation information. When the reserved time is reached, the sub-microcomputer 7 short-circuits the semiconductor switch 2 on the primary side of the power supply and supplies power to the power supply circuit 3. The voltage detection circuit 4 at the secondary output detects power recovery and sends a signal to each circuit. With this signal, the sub-microcomputer 7 transfers the reservation information to the main microcomputer 6. The main microcomputer 6 executes the recording reservation based on the transferred reservation information. At the end of the recording reservation, the sub-microcomputer 7 opens the primary semiconductor switch 2 again to stop the power supply.
Thereafter, the above operation is repeated, whereby the power consumption of the device itself during standby for reservation can be reduced, and a long standby time for reservation can be realized.

The above embodiment will be described in more detail. The semiconductor switch 2 that performs a short circuit and an open operation by an external signal is supplied to the photodiode in the semiconductor switch 2 through the battery 9 and the power supply switching circuit 8 by the on / off operation of the control switch 12 under the control of the sub-microcomputer 7. To control conduction (ON) and insulation (OFF). The semiconductor switch 2 mainly uses an SSR (solid, state, relay), but can be replaced with a coil-activated relay. The power supply circuit 3 is a circuit that converts AC power supplied from the AC outlet 1 into a constant DC voltage.
When the power supply from the AC outlet 1 is stopped (the AC outlet is unplugged or in a power outage state) or the power supply is cut off by the semiconductor switch 2, the supply of the AC power on the primary side is stopped, and the secondary side is stopped. Is lowered.

The voltage detection circuit 4 monitors the output voltage of the power supply circuit 3, determines the state of power supply on the primary side, and transmits a signal to each circuit accordingly.
When the output voltage of the power supply circuit 3 falls below a certain voltage value,
It is determined that the power supply on the primary side has stopped, and a LOW signal is transmitted to each circuit. Further, when the power supply is restarted from the state where the power supply is stopped, when the output voltage on the secondary side rises and becomes equal to or higher than a certain voltage, the voltage detection circuit 4 outputs a high signal.
The signal of H is transmitted to each circuit. As a result, each circuit determines the power supply status on the primary side of the power supply and performs each operation. The recording circuit 5 is a circuit that is provided in the device and receives power supply from the power supply circuit 3 and performs a recording operation under the control of the main microcomputer 6. The main microcomputer 6 includes the power supply circuit 3
, And controls the recording circuit 5 in the device through the control line group 17. Normally, the recording reservation information and each set value information are stored in the memory section of the main microcomputer 6. .

Once in the power failure state, the main microcomputer 6 cuts off the control line group 17 by the LOW signal from the voltage detection circuit 4, suppresses the control, and shifts to the low power consumption mode. During this time, the power of the main microcomputer 6 is supplied to the cutoff switch 13.
Thus, the recording reservation information (recording start time, recording time, recording channel, recording mode, etc.) supplied from the backup capacitor 14 which can be backed up for a short time and stored in the main microcomputer 6 and each setting information (currently Time, channel setting, etc.) are transferred to the memory section in the sub-microcomputer 7 in the data receiving system via the data line 15 and the clock line 16. After the transfer ends, the function is maintained until the power supply of the backup capacitor 14 ends.

When the recording notice time is reached, the power is restored by the sub-microcomputer 7 to be described later, and when the reservation information and the setting information are transferred from the sub-microcomputer 7, the main microcomputer 6
Controls the recording circuit according to the reservation information to start the recording operation. The sub-microcomputer 7 has an internal clocking function. The sub-microcomputer 7 internally stores and holds reservation information and setting information transferred from the main microcomputer 6 and receives an external signal input. When it is determined from the comparison between the reservation information and the clock function that the reservation time has been reached, the control switch 12 is controlled to cause the semiconductor switch 2 to perform a short-circuit operation. That is, when a power-off signal is input from the power switch 11 or the remote control light-receiving unit 10 or when a LOW signal is input from the voltage detection circuit 4, the sub-microcomputer 7 opens the control switch 12 to open the semiconductor switch. 2 to the open state (off), the power switch 11 and the remote control light receiving unit 1
From 0, when a power-on signal is input, or when it is determined that the reservation time has been reached from a comparison between the reservation information and the clock function,
The sub-microcomputer 7 sets the control switch 12 in a short-circuit state,
The semiconductor switch 2 is turned on (ON). When the power is restored by the reservation information, the sub-microcomputer 7 transfers the reservation information and the setting information to the main microcomputer 6 through the data line 15 and the clock line 16, and then the main microcomputer 6 executes the recording reservation.

The role of the power supply switching circuit 8 is to switch the power supply of the sub-microcomputer 7 from the output of the power supply circuit 3 to the battery 9 in response to a signal from the voltage detection circuit 4 at the time of a power failure. It also has a function. That is, when a power failure occurs, the LOW signal from the voltage detection circuit 4 is output.
The power supply switching circuit 8 switches the power supply of the sub-microcomputer 7 to the battery 9 in response to the signal. When the power is restored, the power switching circuit 8 supplies the power of the sub-microcomputer 7 from the battery 9 by the HIGH signal from the voltage detection circuit 4.
The output is switched to the power supply circuit 3, and the battery 9 is switched to the charging mode. The battery 9 can be charged with a large capacity enough to back up the sub-microcomputer 7 for a long time. When the power is restored, the semiconductor switch 2 is turned on through the control switch 12 using the power from the battery 9.

Here, the specific operation of the present embodiment will be described along the process with reference to FIG. (1) When the user inputs recording information, the information is first stored in the memory of the main microcomputer 6. (2) When a timer-on or power-off signal is input, the sub-microcomputer 7 controls the control switch 12 to open the semiconductor switch 2 (off) and cut off power supply to the power supply circuit. (3) The output voltage of the power supply circuit 3 decreases and the voltage detection circuit 4
Sends a LOW signal. (4) In response to this signal, the cutoff switch 13 is opened to switch the power supply of the main microcomputer 6 to the backup capacitor 14, and the main microcomputer 6 shifts to the low power consumption mode, where the recording reservation information stored in the memory unit is set. The information is transferred to the sub microcomputer 7. Sub microcomputer 7
Stores the transferred data in the memory and compares the data with the built-in clock function. The power supply switching circuit 8 switches the battery 9 from the charging mode to the discharging mode, and supplies the power of the battery 9 to the sub-microcomputer 7. (5) The sub-microcomputer 7 holds the reservation information stored under the power supply of the battery 9 and compares it with the clock function.
A signal from an external input (power switch 11, remote control light receiving unit 10) is monitored. (6) When the notice time stored in the sub-microcomputer 7 and the clock function match, or when the power is turned on by an external input, the sub-microcomputer 7 controls the control switch 12 to switch the semiconductor switch 2. The power supply circuit 3 is turned on to supply power. (7) The output voltage of the power supply circuit 3 rises and the voltage detection circuit 4
Transmits a HIGH signal. (8) Based on this signal, the cutoff switch 13 is turned on, and the power of the main microcomputer 6 is switched to the output of the power supply circuit 3, and the main microcomputer 6 is again operated. The power supply switching circuit 8 switches the power supply of the sub-microcomputer 7 to the output of the power supply circuit 3 and switches the battery 9 to the charging mode. After confirming that the main microcomputer 6 has been operated, the sub-microcomputer 7 transfers the reservation information and the setting information stored in the memory unit to the main microcomputer 6. (9) The main microcomputer 6 receiving the data from the sub-microcomputer 7 controls the recording circuit based on the reservation information and executes the recording reservation. (10) At the same time as the end of the recording, the sub-microcomputer 7 controls the control switch 12 to open the semiconductor switch 2 (off) and cut off the power supply to the power supply circuit. After (11), the above (3) and subsequent steps are repeated.

[0017]

According to the first aspect of the present invention, in a backup device, a backup microcomputer which consumes less power than the microcomputer and is driven by a backup battery is used separately from a microcomputer for controlling a device to be used. By using the detection signal detected by the voltage detection circuit to detect the input DC voltage from the external power supply, the stored information in the microcomputer that controls the device to be used is transferred to the backup microcomputer, and the backup operation is performed. A power saving effect is obtained, and backup can be performed for a long time. Also, when used in a recording reservation device, the backup device uses a low-power consumption backup microcomputer separately from the microcomputer that controls the equipment used, so that the backup function works for a long time, and the stored information is stored in the microcomputer when a power failure occurs In this case, the stored information is retained in the backup microcomputer without being lost, and after the power failure recovery, the scheduled recording is performed as usual when the recording time comes, and the power consumption is larger when the power is turned off, that is, in the standby state. The power consumed by the microcomputer can be reduced to “zero”, and the power saving effect of the standby power of the used device can be obtained.

Advantageous Effect Corresponding to Claim 2: In addition to the effect corresponding to Claim 1, the backup battery may be
By using a rechargeable battery, a reliable backup operation can be performed, and the device can be provided in a form of use that is easier to maintain.

Advantageous Effect Corresponding to Claim 3: Claim 1 or 2
In addition to the effects corresponding to the above, by providing a dedicated backup capacitor for the microcomputer that controls the equipment used, the backup battery can be used for the backup microcomputer and the power supply can be shared by each. And a more rational backup operation becomes possible.

Advantages Corresponding to Claim 4: Claims 1 to 3
In addition to the effects corresponding to the above, a switch controlled by a backup microcomputer, that is, based on an external input, for example, a remote control input or stored information held in the microcomputer, is provided to control the power supply from an external power supply. Since the power can be turned on / off,
It is also possible to control a power-on operation based on stored information, for example, power-on in a reservation function.

According to a fifth aspect of the present invention, in addition to the effect of the fourth aspect, by employing a semiconductor switch, a backup device including primary and secondary utilization devices for the external power supply can be provided. It can be separated, and safe and reliable operation can be performed.

[Brief description of the drawings]

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

FIG. 2 is a circuit block diagram showing a conventional recording reservation device.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... AC outlet, 2 ... Semiconductor switch, 3 ... Power supply circuit, 4 ... Voltage detection circuit, 4 '... Power failure detection circuit, 5 ... Video recording circuit, 6, 6' ... Main microcomputer, 7 ... Sub microcomputer,
8 power supply switching circuit, 9 battery, 10 remote control light receiving section, 11 power switch, 12 control switch, 13
... cutoff switch, 14 ... backup capacitor, 15
... data line, 16 ... clock line, 17 ... control line group.

Claims (5)

[Claims] 1. A voltage detection circuit for outputting a signal when a DC voltage supplied from an external power supply to a microcomputer for controlling a device to be used becomes less than a certain value or more than a certain value, and a detection signal of the voltage detection circuit. A backup device having backup means for backing up the microcomputer, wherein the backup means has a backup microcomputer which consumes less power than the microcomputer, and a backup battery, and the voltage detection circuit has a voltage lower than a certain value. Is detected, the stored information in the microcomputer is transferred to the backup microcomputer using the power of the backup battery, and when the voltage detection circuit detects a voltage equal to or higher than a predetermined value, the information is supplied from the external power supply. The stored information in the backup microcomputer using A backup device comprising means for transferring the data to the microcomputer. 2. The backup device according to claim 1, wherein the backup battery is charged with a DC voltage supplied from the external power supply, and charging / discharging is switched based on a detection signal of the voltage detection circuit. A backup device characterized by the above-mentioned. 3. The backup device according to claim 1, further comprising a backup capacitor for the microcomputer, wherein when the voltage detection circuit detects a voltage equal to or less than a predetermined value, the power of the backup capacitor is reduced to the microcomputer. A backup device for transferring information stored in the backup microcomputer to the backup microcomputer. 4. The backup device according to claim 1, further comprising a switch for supplying / cutting power from the external power supply to the backup device.
A backup device, wherein the switch is controlled by the backup microcomputer. 5. The backup device according to claim 4, wherein the switch is a semiconductor switch, the semiconductor switch is provided on a primary side for the external power supply, and the voltage detection circuit is provided on a secondary side for the external power supply. A backup device characterized by the following.