JP2002157796A - Power controller - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a power controller, with which the life of a battery adopted as the inside power source can be prolonged without the increase of the battery capacity, in the power interrupted state such that the power supplied from the external power source is interrupted. SOLUTION: In the power interrupted state such that the cumulated time of the power interrupted state after the operation is started by the user is within the 2nd specified period, the operation of the main body of an equipment is stopped and the 1st power saving state is set for performing the data holding operation and the clock hand moving operation, meanwhile, in the power interrupted state such that the cumulated time of the power interruption exceeds the 2nd specified period, the data holding operation and the hand moving operation only within the 1st specified period from the time run into the power interrupted state are performed, and after the 1st specified period, the clock hand movement is stopped, then the 2nd power saving state is set for performing only the data holding operation.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device such as a video tape recorder (hereinafter, referred to as "VTR") equipped with a clock function, such as a magnetic recording / reproducing device, which needs to retain data even during a power outage. The present invention relates to a power control device mounted on a vehicle.

[0002]

2. Description of the Related Art In recent years, equipment such as a magnetic recording / reproducing apparatus uses power from an internal power supply device constituted by a battery in a power failure state. For this reason, a power saving operation for reducing power consumption is required, and a power control device that performs the operation is regarded as important.

[0003] A conventional technique will be described below by taking a power control device mounted on a VTR as an example. FIG.
FIG. 2 is a block diagram illustrating a configuration of a conventional power control device. In FIG. 4, reference numeral 1 denotes a power supply switching means,
When the power supplied from the external power outlet via the power cord of the VTR is cut off, the power supply source is switched to the internal power supply 11 which is a battery inside the VTR. Reference numeral 2 denotes a power supply unit that supplies power supplied from the power supply switching unit 1. Reference numeral 3 denotes a power failure detection means,
A power failure state in which the power supply from the power supply is interrupted outputs a power failure detection signal based on the fact that the power supply voltage of the external power supply 10 becomes equal to or lower than a predetermined value, and the power supply voltage is restarted when the power supply voltage from the external power supply 10 is restarted. If a detection is made based on the fact that the value becomes greater than or equal to the value, a power failure recovery signal is output. Reference numeral 4 denotes a timepiece, which performs a hand movement operation using the power supplied from the power supply means 2 and performs time management necessary for VTR reserved recording. Reference numeral 5 denotes a data storage unit which stores control data necessary for the VTR to perform a predetermined operation, and is constituted by a volatile memory, a DRAM (an as-necessary write / read memory which requires a storage holding operation using electric power). Have been. Reference numeral 12 denotes a main body of the VTR, which is mainly composed of a mechanism excluding a clock hand moving means and a data storage means 5 and a video / audio signal circuit. Reference numeral 8 denotes a control unit that performs an operation based on the data stored in the data storage unit 5 and stops the operation of the VTR main body 12 when a power failure detection signal is supplied from the power failure detection unit 3 to reduce power consumption. In operation, only the clock 4 and the data storage means 5 are operated.
The power saving operation is realized by using a microprocessor or the like to operate at an operation clock (32 KHz) lower than a normal operation clock (16 MHz, for example) and at a low voltage. When the power failure recovery signal is supplied, the VTR main unit 1 is operated based on the data stored in the data storage means 5.
2 is operated normally in a predetermined state.

[0004] The operation of the conventional power control device configured as described above will be described below. When the power supply from the external power supply 10 is stopped, such as when the power supply from the power plant or the generator to the outlet is stopped or the power cord is unplugged from the outlet, the power supply switching unit 1 switches the power supply source to the internal power supply 11, and Power is supplied by the supply means 2. When detecting a power failure, the power failure detecting means 3 outputs a power failure detection signal. The control means 8 to which the power failure detection signal is supplied from the power failure detection means 3 stops the operation of the VTR main body 12, supplies the power to the clock 4 and the data storage means 5, and performs the hand operation and the data holding operation in the power saving state. (Low operation clock, low voltage). Then, when the power supply from the external power supply 10 is restarted, the power supply means 2 supplies the power from the external power supply 10 switched by the power supply switching means 1. The control means 8 to which the power failure recovery signal output from the power failure detection means 3 is supplied.
Causes the VTR body 12 to operate normally based on a normal operation clock using power from an external power supply.

As described above, in the conventional power control apparatus, the control means 8 stops only the operation of the main body of the apparatus and supplies power to the timepiece 4 in the power failure state in which the power supply from the external power supply is cut off, thereby performing the hand operation. Then, the first power saving state is set in which the power is supplied to the data storage unit 5 to execute the data holding operation and the control unit 8 executes its own operation.

[0006]

However, in the above-mentioned conventional configuration, the power is always consumed during the power failure state, so that the power consumption is large and the life of the battery serving as the internal power supply is shortened. As a result, in a usage method in which power failure frequently occurs, there is a problem that the battery is completely discharged regardless of the service life of the device and data is lost.

An object of the present invention is to solve the above-mentioned conventional problems, and an object of the present invention is to provide a power control device capable of extending the life of a battery serving as an internal power supply without increasing the battery capacity.

[0008]

In order to achieve this object, a power control device according to the present invention provides a power supply source to an internal power supply provided therein when supply from an external power supply is cut off. A power supply switching means for switching, a power supply means for supplying power supplied from the power supply switching means, and a power failure detection signal to output a power failure detection signal when detecting a power failure state in which power supply from the external power supply is interrupted. When the power supply is resumed, a power failure detection unit that outputs a power failure recovery signal, a clock that performs a hand operation, a data storage unit that stores information, and the power failure recovery signal from the input of the power failure detection signal are input. A power failure time measuring unit that outputs a power failure time reaching signal when the measurement time reaches a first predetermined period during the measurement period, and outputs a power failure time during the measurement period; A cumulative outage time measuring means for cumulative time is output as the cumulative power failure time arrival signal reaches a second predetermined time period as well as measure the accumulated time of the power failure state Zui,
The device operates based on the data stored by the data storage means, and when the power failure detection signal is supplied, stops only the operation of the device main body, supplies power to the timepiece, executes the hand movement operation, and executes the data operation. Setting a first power saving state in which power is supplied to the storage means to execute a data holding operation and execute its own operation; and when the cumulative power outage time reaching signal is supplied, the power outage time reaching Based on the input of the signal, power is supplied only to the data storage means, only the data holding operation is performed, the operation of the device main body is stopped, the power supply to the timepiece is cut off, the hand operation is stopped, and the own operation is performed. A second power saving state to be stopped is set, and a control means is provided for canceling the first or second power saving state when the power failure recovery signal is supplied.

This configuration guarantees both clock hand movement and data retention in a usage situation where power failures do not frequently occur, and guarantees hand movement and data only for short-time power failures in usage situations where power failures occur frequently, and prolongs power failures. As a result, only the data can be guaranteed, extending the life of the battery, which is the internal power source, maintaining data and ensuring clock movements within a predetermined period, and reducing the number of battery replacements and the number of batteries used. Can be reduced.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION
Power supply switching means for switching a power supply source to an internal power supply provided therein when supply from an external power supply supplied from the outside is cut off, power supply means for supplying power supplied from the power supply switching means, A power failure detection unit that outputs a power failure detection signal when detecting a power failure state in which power supply from the external power supply is interrupted, and outputs a power failure recovery signal when power supply from the external power supply is resumed; Clock and
A data storage unit for storing information; and a power outage time is measured from the input of the power outage detection signal to the input of the power outage recovery signal, the power outage time is output, and the measurement time reaches a first predetermined period during the measurement period. Then, a power failure time measuring unit that outputs a power failure time reaching signal, and a cumulative power failure time that outputs a cumulative power failure time reaching signal when the cumulative time reaches a second predetermined period when the cumulative time of the power failure state is measured based on the power failure time. The time measuring means and the data storage means perform an operation based on the data stored therein, and when the power failure detection signal is supplied, stop only the operation of the device main body and supply power to the timepiece to perform a hand movement operation. Setting a first power saving state in which power is supplied to the data storage unit to execute a data holding operation and execute its own operation.
Further, when the cumulative power outage time reaching signal is supplied, based on the input of the power outage time reaching signal, power is supplied only to the data storage means to execute only the data holding operation, and the operation of the device main body is performed. A second power saving state in which the power is stopped to stop the power supply to the watch to stop the hand movement operation and stop the operation of itself, and the first or second power saving state is provided when the power failure recovery signal is supplied. Control means for canceling the state, wherein the operation of the device main body is stopped in the power failure state within the second predetermined period after the user has started using the power failure state. A first power saving state for performing a data holding operation and a clock hand operation is set, and in the case of a power failure in which the accumulated time of the power failure exceeds a second predetermined period, a first predetermined power saving operation and a first predetermined time from the entry of the power failure state are set. Within the period By setting the second power saving state in which only the data movement is performed by stopping the movement of the clock after the first predetermined period, the life of the battery as the internal power source is extended, and the data holding operation is performed. In addition, it is possible to secure the clock operation within a predetermined period, and to reduce the number of battery replacements and the number of used batteries.

According to a second aspect of the present invention,
The hand operation is performed only when the time is set, and when the time is not set, a time non-set signal is output.The control means operates based on the data stored in the data storage means and performs a power failure. When the detection signal is supplied,
When the time unset signal is output, power is supplied only to the data storage unit, only the data holding operation is performed, the operation of the device main body is stopped, and the power supply to the timepiece is cut off to perform the hand movement operation. The second power saving state is set to stop the operation of the watch itself, and when the time unset signal is not output, only the operation of the device main body is stopped to supply power to the watch and to operate the hand. Setting a first power saving state in which an operation is performed, power is supplied to the data storage means, a data holding operation is performed, and a self-operation is performed, and when a cumulative power outage time reaching signal is supplied, Power is supplied only to the data storage means based on the input of the power failure time reaching signal, only the data holding operation is performed, the operation of the device main body is stopped, and the power supply to the timepiece is cut off. Setting a second power saving state for stopping the operation and stopping its own operation, and releasing the first or second power saving state when a power failure recovery signal is supplied, If the time is not set on the watch, the hand operation is not performed, thereby further extending the life of the battery, which is the internal power supply, realizing data retention and securing the clock movement within a predetermined period, and replacing the battery. This has the effect that the number of times and the number of batteries used can be further reduced.

An embodiment of a power control device according to the present invention will be described below with reference to the drawings.

(Embodiment 1) FIG. 1 is a block diagram showing a configuration of a power control device according to Embodiment 1 of the present invention, taking a power control device mounted on a VTR as an example. As shown in FIG. 1, the power control device
Power supply means 2, power failure detection means 3, clock 104
, Data storage means 105, power outage time measurement means 106
, Cumulative power outage time measuring means 107, and control means 108.

The operation will be described below. Reference numeral 1 denotes a power supply switching unit which, when power supplied from an external power supply outlet is cut off via a power supply cord of a VTR which is an external power supply 10, supplies a power supply to an internal power supply 11 which is a battery inside the VTR. Switch. However, although the power supplied from the outlet is an AC power supply, the power supply converted to DC by the DC conversion circuit provided inside the VTR main body 12 is supplied to the power supply switching means 1 as the external power supply 10. The power supply switching means 1 can be configured using, for example, a diode 201 as shown in FIG. FIG. 2 is a circuit diagram showing an example of the power supply switching means according to Embodiment 1 of the present invention.
Reference numeral 2 denotes a power supply unit that supplies power supplied from the power supply switching unit 1. Reference numeral 3 denotes a power failure detection means, wherein the power supply voltage V1 of the external power supply 10 is smaller than a preset voltage value V2,
That is, when V1 <V2 is detected, a power failure detection signal is output assuming that the power supply from the external power supply 10 has been cut off and the vehicle has entered a power failure state. When it is detected that the external power supply voltage V1 is equal to or higher than the voltage value V2, that is, V1 ≧ V2, the power supply from the external power supply 10 is restarted and a power failure recovery signal is output. The clock 104 performs a hand operation using the electric power supplied from the electric power supply unit 2, and performs time management required for the reserved recording of the VTR main body 12. When the time is not set, the clock 104 outputs a time non-set signal. The data storage unit 105 stores control data necessary for the VTR main body 12 to perform a predetermined operation. The data storage unit 105 is a volatile memory such as a DRAM (a random write / read memory that requires a storage holding operation using power). It is configured. The power failure time measuring means 106 starts time measurement when the power failure detection signal is supplied from the power failure detection means 3, measures and outputs the power failure time until a power failure recovery signal is input, and measures the measurement time during the measurement period. When a first predetermined period (for example, one hour) is reached, a power failure time reaching signal is output. The cumulative power failure time measuring means 107 calculates the cumulative time of the power failure that has occurred since the VTR body 12 was started to be used based on the power failure time supplied from the power failure time measuring means 106. When a predetermined period of time (for example, one year) is reached, an accumulated power outage time reaching signal is output. The functional operation of the control unit 108 will be described with reference to FIG. FIG. 3 is a flowchart showing the operation of the control means 108 according to Embodiment 1 of the present invention. The control means 108 determines in step S
In step 1, the power failure detection signal is confirmed. If the power failure detection signal is not supplied from the power failure detection means 3, the data storage means 105
The operation is performed based on the data stored by. When the power failure detection signal is detected, the presence or absence of the input of a time unset signal from the clock 104 is detected in step S2. In step S3, the input of the cumulative power outage time arrival signal is confirmed. When the clock unset signal is not supplied from the clock 104, or when the cumulative power failure time reaching signal is not supplied from the cumulative power failure time measuring unit 107, the power failure detection signal is supplied.
In step S4, the control means 108 stops the operation of the VTR main body 12, supplies power to the clock 104 and the data storage means 105, executes the hand movement and the data holding operation, and enters the first power saving state in which the operation itself is performed. I do. When the time unset signal is supplied from the clock 104, the control unit 108
Stops the operation of the VTR main body 12 in step S7, stops the power supply to the timepiece 104 in step S10, and stops the hand operation, and stops the operation of the control means 108 itself in step S11 to reduce the power consumption. By supplying power only to the storage unit 105, a second power saving state is executed in which only the data holding operation is executed.

If the time unset signal is not supplied and the cumulative power outage time reaching signal is supplied, the control means 108 stops the operation of the VTR body 12 in step S8. Then, in step S9, it is confirmed by the power failure time reaching signal whether the power failure time has reached one hour (first predetermined period). If the power failure time arrival signal is not input,
It waits in the first power saving state. If the power outage time exceeds one hour and the power outage time reaching signal is detected in step S9, the control means 108 cuts off the power supply to the timepiece 104 in step S10 to stop the hand operation, and step S11.
Then, the operation of the control unit 108 is stopped to suppress power consumption, and the power is supplied only to the data storage unit 105 to enter a second power saving state in which only the data holding operation is executed.

If the cumulative power outage time reaches one year (a second predetermined period) during the power outage period in the first power saving state, the control means detects the input of the cumulative power outage time reaching signal in step S5. In step S9, a power failure time reaching signal is detected. If detected, the power supply to the timepiece 104 is cut off in step S10 to stop the hand operation, and in step S11, the control means 108 stops its own operation. ,
The power is supplied only to the data storage unit 105 and only the data holding operation is performed.

However, the operations of the data storage unit 105 in the “first power saving state” and the clock 104, the data storage unit 105, and the control unit 108 in the “second power saving state” are the power saving modes with low power consumption. Perform the operation. The power saving operation is performed by a microprocessor or the like, and the operation clock (32 clocks) is lower than the normal operation clock (16 MHz, for example).
KHz) and the power supply voltage, so that power consumption can be reduced as compared with a normal state. When the power failure recovery signal is detected in step S6, step S12, or step S13, the control unit 108 releases the first power saving state or the second power saving state in step S14, and the data storage unit 5 stores the power saving state. The VTR main body 12 is normally operated in a predetermined state based on the data and the time by the clock 104.

The operation of the power control device configured as described above will be described below. When the power supply from the external power supply 10 is stopped, such as when the power supply from the power plant or the generator to the outlet is stopped or the power cord is unplugged from the outlet, the power supply switching unit 1 switches the power supply source to the internal power supply 11, and Power is supplied by the supply means 2.
When detecting a power failure, the power failure detecting means 3 outputs a power failure detection signal. The control unit 108 supplied with the power failure detection signal from the power failure detection unit 3 checks whether the time is set in the clock 104 or whether the accumulated time has reached one year (a second predetermined period). If the time is set and the cumulative power outage time is less than the second predetermined period, for example, immediately after the user starts using the VTR main body 12 or the use, the operation of the VTR is stopped and power is supplied to the clock 104 and the data storage means 105 Then, the self-operation, the hand movement operation, and the data holding operation are executed in a power saving state (low operation clock, low voltage).

When the power supply from the external power supply 10 is restarted, the power supply means 2 supplies the power from the external power supply 10 switched by the power supply switching means 1. The control means 108 to which the power failure recovery signal output from the power failure detection means 3 is supplied operates the VTR main body 12 normally based on a normal operation clock using the power from the external power supply 10.

Next, a power outage occurs (e.g., the cumulative power outage time is less than a second predetermined period) after the VTR has been used for a number of years, and the cumulative power outage time is in the second predetermined time during the first power saving state. When the period is reached, the cumulative power outage time measuring means 107 outputs a cumulative power outage time reaching signal. Then, it is confirmed whether or not the current power failure has elapsed for one hour (first predetermined period). If it is shorter than the first predetermined period, the current state (first power saving state) is maintained, and if it is longer than the first predetermined period, the state shifts to the second power saving state. Then, when the power supply from the external power supply 10 is restarted, the control unit 108 causes the VTR main body 12 to operate normally based on the normal operation clock.

When a power failure occurs (the cumulative power failure time is equal to or longer than a second predetermined period) in a state where the power failure state is repeated after the VTR has been used for a further period of time, the power failure time signal indicates that the power failure has occurred. Check if one hour has passed since the power failure. If it is less than the first predetermined period, the operation of the VTR main body 12 is stopped, and
And the data storage means 105 to perform its own operation, hand movement operation, and data holding operation in a power saving state (low operation clock,
The first power saving state executed at a low voltage is maintained. When the power outage continues and the power outage time exceeds the first predetermined period, the power supply to the clock 104 is cut off to stop the hand movement operation, and the control means 108 stops its own operation so that only the data storage means 105 receives power. Second to supply and hold data
To the power saving state.

When the power supply from the external power supply 10 is resumed, the control means 108 causes the VTR main body 12 to operate normally based on a normal operation clock. Thereafter, this operation is repeated every time a power failure occurs.

As described above, according to the present embodiment, in the power failure state where the external power supply 10 is cut off, the power saving operation is selected and executed based on the elapsed time of the power failure and the accumulated power failure time. The power consumption of the internal power supply (battery) during a power failure can be suppressed. Thus, when the accumulated time of the power failure is small, it is determined that the time is within the service life of the device, and the operation of the clock is always guaranteed during the power failure. Then, when the cumulative power outage time becomes long as the service life of the device approaches, the operation of the clock is guaranteed only for a short-time power outage, thereby preventing the consumption of the internal power supply and ensuring the performance of the device. .

Further, by selecting and executing a power saving operation based on the presence or absence of time setting of the clock, it is not necessary to operate the clock when the time is not set, so that power consumption is minimized. can do.

In the first embodiment, the portion 100 surrounded by a broken line in FIG. 1 can be similarly realized by software processing in a microcomputer, and is not limited to the present embodiment. is not.

[0026]

As described above, according to the embodiment of the present invention,
In the power failure state where the external power supply is cut off, the power consumption of the battery which is the internal power supply during the power failure can be suppressed by selecting and executing the power saving operation based on the elapsed time of the power failure and the accumulated power failure time. To extend battery life, maintain data and ensure clock movement within a predetermined period,
An excellent effect of reducing the number of battery replacements and the number of batteries used can be obtained.

Further, by selecting and executing a power saving operation based on the presence or absence of time setting of the clock, it is not necessary to operate the clock when the time is not set, so that power consumption is minimized. The excellent effect that it can be obtained is obtained.

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating a configuration of a power control device according to a first embodiment of the present invention.

FIG. 2 is a circuit diagram showing an example of a power supply switching unit according to the first embodiment of the present invention.

FIG. 3 is a flowchart illustrating an operation of a control unit according to the first embodiment of the present invention.

FIG. 4 is a block diagram showing a configuration of a conventional power control device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Power supply switching means 2 Power supply means 3 Power failure detection means 10 External power supply 11 Internal power supply 12 VTR main body 104 Clock 105 Data storage means 106 Power failure time measuring means 107 Cumulative power failure time measuring means 108 Control means

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 2F002 AA07 AA12 AD06 AD07 AE02 AE04 BA00 CB01 CB11 DA00 ED02 GA04 GA08 2F084 AA00 AA07 BB01 CC02 GG04 HH02 HH15 HH16 HH22 LL01 LL02 5D101 AA01 CJ03 CJ13

Claims (2)

[Claims] 1. A power supply switching means for switching a power supply source to an internal power supply provided therein when supply from an external power supply supplied from the outside is cut off, and an electric power for supplying electric power supplied from the power supply switching means Power supply detection means for outputting a power failure detection signal when detecting a power failure state in which power supply from the external power supply is cut off, and outputting a power failure recovery signal when power supply from the external power supply is resumed; A clock that performs a hand operation, data storage means for storing information, and a power failure time is measured from the input of the power failure detection signal until the power failure recovery signal is input, and the power failure time is output, and the measured time during the measurement period is measured. A power outage time measuring means for outputting a power outage time reaching signal when the power outage reaches a first predetermined time period; A cumulative power outage time reaching means for outputting a cumulative power outage time reaching signal when the period is reached; and performing an operation based on the data stored in the data storage means. Setting a first power saving state in which only the power is supplied to the timepiece to perform the hand movement operation, the power is supplied to the data storage means, the data holding operation is performed, and the operation is performed. When the cumulative power outage time reaching signal is supplied, based on the input of the power outage time reaching signal, power is supplied only to the data storage means to execute only the data holding operation and stop the operation of the device body. A second power saving state is set in which the power supply to the timepiece is stopped to stop the hand movement operation and stop its own operation, and when the power failure recovery signal is supplied, the first or second power saving state is set. Control apparatus characterized by comprising a control means for releasing the second power saving state. 2. The timepiece performs a hand movement operation only when the time is set, and outputs a time non-set signal when the time is not set, and the control means controls the data stored in the data storage means. When the power failure detection signal is supplied and the time unset signal is output, the power supply is performed only to the data storage means to execute only the data holding operation, and the device is operated. A second power saving state in which the operation of the main body is stopped, the power supply to the watch is stopped, the hand operation is stopped, and the operation is stopped, and the time non-setting signal is not output,
A first power saving state in which only the operation of the device main body is stopped, power is supplied to the timepiece, the hand operation is performed, the data storage unit is supplied with power, the data holding operation is performed, and the own operation is performed. Setting, further, when the cumulative power failure time reaching signal is supplied, based on the input of the power failure time reaching signal, the power is supplied only to the data storage means to execute only the data holding operation, and the A second power saving state is set in which the operation is stopped, the power supply to the timepiece is stopped, the hand operation is stopped, and the operation is stopped, and the first or second power saving state is provided when the power failure recovery signal is supplied. The control device according to claim 1, wherein the power state is released.