JPS62213524A - Electronic equipment - 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 electronic equipment driven by power supplied from a battery.

[Prior Art] ``Recently, due to improvements in electronic technology, the need for smaller devices and portability of devices has led to an increase in the number of devices that can be driven by power supplied from batteries. These devices are equipped with an automatic power cutoff device (AutoP) that automatically cuts off the power to the device as a means to extend the battery life of the device.
(ower 0ff) (1) Many devices are built-in.

[Problem that the invention seeks to solve]

However, most of these automatic power cut-off devices are usually configured to cut off the power if the device stops operating and enters a standby state and is not re-entered for a certain period of time. It is. In addition, in the standby state mentioned above, many devices require a constant power consumption regardless of the battery voltage level, so if the battery voltage level decreases, the current naturally increases, and the internal resistance of the battery Considering that the battery voltage increases as the voltage level decreases, there is a problem in that battery consumption during standby mode increases synergistically as the battery voltage level decreases.

This invention was made to solve the above problems, and is an electronic device that can greatly extend the life of a battery by controlling the cutoff time of the power supplied from the battery according to the voltage level of the battery. The purpose is to select.

[Means for solving problems]

The electronic device according to the present invention includes a voltage detection means for detecting the voltage level of the battery from the time the power is turned on, and a cutoff time setting means for variably setting the cutoff time until the power is cut off according to a drop in the voltage detection means. A cut-off control means is provided for controlling the cut-off of the battery power when no input information is input during the cut-off time variably set by the cut-off time setting means.

[Effect]

In this invention, the voltage detection means detects the voltage level of the battery after the power is turned on, and the cutoff time setting means variably sets the cutoff time according to the decrease in the voltage level. If input information is not input during the elapse of the cutoff time set by the cutoff time setting means, the power cutoff control means controls cutoff of the power supplied from the battery.

〔Example〕

FIG. 1 is a block diagram illustrating the configuration of an electronic typewriter showing an embodiment of the present invention, in which 1 is a central processing unit (
The CPU reads out a control program, etc. according to the flowchart shown in FIG. 2 stored in the ROM 2, performs calculations 9 and judgments necessary for the typewriter function, and generally controls each section. In addition to the control program, the ROM 2 stores character codes and dot patterns (character generator) necessary for printing, and information necessary for printing and motor operation. 3 is a RAM, which functions as a read/write memory for storing data during instruction execution by the CPUI, calculation results, or character codes input from the keyboard 4; The keyboard 4 functions as an input means for inputting various data necessary for character printing 9 document editing. A display 5 functions as a display output means for displaying key data input from the keyboard 4 or information (messages, symbols) necessary for the operator while the typewriter is in operation.

Reference numeral 6 denotes a printer, and printing is controlled by a printer controller 7 based on input data from the keyboard 4. 8
is the output boat, which connects the control line S according to instructions from CPU1.
2 to the down counter 9 via a logic level signal (“l”
or “0”). The down counter 9 is a binary signal obtained by converting the voltage level supplied from the battery 11 via the control line S6 by the A/D converter 12 when the power switch 1o is pressed, that is, the control line for the cut-off time corresponding to the voltage level. Loaded through S3 and the logic level signal is “0”.
”, the count value corresponding to the binary signal starts counting down. Reference numeral 13 denotes a power supply circuit that maintains a constant voltage necessary for the electronic typewriter and supplies it to each part regardless of voltage fluctuations of the battery 11. 14 is a latch relay, and the relay switch SW is turned on based on the pulse signal sent from the start circuit 15 via the control line S4.
After the cut-off time set in the down counter 9 has finished counting, the coil is excited by a pulse signal sent via the control line S5, and the relay switch SW is turned off.

S1 is a bus that exchanges information between the CPU 1 and the above-mentioned 2 to 8. Note that the dotted line portion indicates the electronic typewriter main body side.

Next, the power cutoff control operation according to the present invention will be explained with reference to FIGS. 1 and 2.

FIG. 2 is a flowchart illustrating a power cutoff control operation showing an embodiment of the present invention. In addition, (1) to (20
) indicates each step.

When the power switch 10 is pressed (1), the latch relay 14 is turned on (2), and a constant voltage is applied from the power supply circuit 13 to the main body of the electronic typewriter, initializing each part, for example clearing the RAM 3, and clearing the display 5. and the printer 6 (3). Next, the output port 8 is temporarily set to LOW (rOJ) 4), and a count load pulse is output to the down force counter 9 via the control line S2 (5).

In response to this, the A/D converter 12 converts the current voltage level of the battery 11 sent via the control line S6 into an A/D converter.
The converted binary signal is loaded into the down counter 9 via the control line S3 (8). The down counter 9 starts counting down based on this binary signal (7). When these initial settings are completed, it is determined whether a key has been pressed manually from the keyboard 4 (8). If no, the down counter 9 starts counting down. 8. Please wait for the process to finish.
), when the counting operation is completed, the relay switch SW of the latch relay 14 is turned off based on the pulse signal outputted via the control line S5 (10), and the control is ended.

On the other hand, if the judgment in step (8) is YES, print 9 edit the document manually entered using the keyboard 4 (1
1). Next, the CPU waits for the key manual data storage and display as well as any control of printer operation to be completed (12), and upon completion, the output port 8 is
(13) and outputs a count load pulse to the down counter 9 via the control line S2 (14). As a result, the latest binary signal obtained by A/D converting the current voltage level of the battery 11 is loaded into the down counter 9 as an initial value (15), and the countdown of the down counter 9 is restarted (1B). . Next, it is determined whether or not a key input was performed while the down counter 9 is counting down (17), and if YES, the process returns to step (11), and if N'O, the process waits for the down counter 9 to finish counting (18), and the process ends. Then, a pulse signal is output to the latch relay 14 via the control line S5 to turn off the relay switch SW (18), cut off the power supply from the battery 11 (20), and end the control. Although the case has been described in which the cut-off time set in the down counter 9 varies depending on the initial value loaded, it goes without saying that the cut-off time is shortened as the power supply potential of the battery 11 becomes lower.

In the above embodiment, a case has been described in which the down counter 9 is used to control the opening and closing of the relay switch SW of the latch relay]4, but the same effect can be obtained even if the up counter and the comparator are used to control the opening and closing of the relay switch SW. You can expect it. Also, rather than the hardware configuration, the A/D converter 12
The relay switch of the latch relay 14 is controlled by software so that the output of the CPU 1 is stored in a specific area of the RAM 3, and the value of the software counter by the CPU is compared with the stored output of the A/D converter 12. The opening and closing of the SW may be controlled.Furthermore, in the above embodiment, the battery 1
We have explained the case where the cut-off time is determined in proportion to the voltage drop of 1, but in a non-linear manner, for example, the cut-off time may be varied in proportion to the square of the battery voltage drop, or when the battery voltage is higher than a preset voltage. In this case, the power supply cutoff operation may be suppressed. Further, the cut-off time may be variably set independently at the end of the key manual operation and at the end of the printer operation. Further, in the above embodiment, the case where the power to the battery 11 is cut off by the latch relay 14 has been described, but a semiconductor switch such as a transistor may also be used.

Further, in the above embodiment, an electronic typewriter driven by power supplied from the battery 1 was described as an example, but the present invention can also be applied to electronic equipment driven by the battery 11, such as a hand belt computer.

〔Effect of the invention〕

As explained above, the present invention includes a voltage detection means for detecting the battery voltage level from the time the power is turned on, and a cutoff time setting means for variably setting the cutoff time until the power is cut off according to a drop in the voltage detection means. Since the cutoff control means is provided to control the cutoff of the battery power when no input information is input during the elapse of the cutoff time variably set by the cutoff time setting means, the power level supplied from the battery is fluctuated. too,
Since the power cutoff time is variably set according to the level of fluctuation, battery power consumption can be minimized compared to devices that cut off the power after a certain period of time, which has the advantage of significantly extending battery life. have

[Brief explanation of drawings]

FIG. 1 is a block diagram illustrating the configuration of an electronic typewriter according to an embodiment of the invention, and FIG. 2 is a flowchart illustrating a power cutoff control operation according to an embodiment of the invention. In the figure, 1 is a CPU, 2 is a ROM, 3 is a RAM, 4 is a keyboard, 5 is a display, 6 is a printer, 7 is a printer controller, 8 is an output port, 9 is a down counter, 10
is a power switch, 11 is a battery, 12 is an A/D converter,
13 is a power supply circuit, 14 is a latch relay, and 15 is a start circuit. Figure 1 14 Ratsunari-

Claims (2)

[Claims] (1) In an electronic device driven by power supplied from a battery, a voltage detection means detects the voltage level of the battery from the time the power is turned on, and a cutoff until the power supply is cut off in response to a decrease in the voltage detection means. A cutoff time setting means for variably setting a time, and a cutoff control means for controlling the cutoff of the power supply of the battery when input information is not input during the elapse of the cutoff time variably set by the cutoff time setting means. Featured electronic equipment. (2) The cut-off control means cuts off the power supply after a predetermined time period set by the cut-off time setting means has elapsed from the time when processing for predetermined input information is completed. electronic equipment.