JPH10271693A - Battery consumption indication controller of remote controller - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prohibit an exhaustion indication when a battery is attached/ detached to/from a remote controller having a battery consumption indicating function to avoid erroneous recognition. SOLUTION: In addition to the system reset voltage monitoring circuit 7 of a remote controller, a 2nd voltage monitoring circuit 8 is connected to the control signal input port 1b of a microcomputer 1. The operation timing of the 2nd voltage monitoring circuit 8 is delayed from the operation timing of the 1st voltage monitoring circuit 7 by a timing circuit (R3 and C3). If a voltage is instantaneously drops below a specified level by a transmission operation at the time of the battery consumption, the output level of the 1st voltage monitoring circuit 7 is turned to a reset level and the output level of the 2nd voltage monitoring circuit 8 is kept at a Hi level. At that time, a microcomputer 1 indicates the alarm of voltage drop with an indication LED 6. When the exhausted battery is detached and a new battery is attached, both the output levels of the 1st and 2nd voltage monitoring circuits are Lo and the alarm is not indicated.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a battery consumption display control device of a remote controller, and more particularly to a battery consumption display control device of a remote controller which prevents malfunction.

[0002]

2. Description of the Related Art In an infrared remote controller or an RF remote controller, a voltage monitoring circuit for preventing a system runaway by resetting a built-in microcomputer when a power supply is momentarily interrupted or when a power supply battery is attached / detached. Is provided.

[0003] When the power supply battery is consumed to some extent, even when the microcomputer is in standby mode in the sleep mode and the battery voltage is equal to or higher than the lower limit, the microcomputer and the transmission circuit become large when the transmission operation is started by key operation. When the current flows, the power supply voltage instantaneously falls below the lower limit.

At this time, a reset signal is output from the voltage monitoring circuit to the microcomputer. At the time of the reset operation, the microcomputer controls the battery to display the battery exhaustion on display means such as an LED and prompts the user to replace the battery. A remote controller provided with a display function is known.

[0005] However, in this type of remote controller, even when the battery is replaced with a new battery, a voltage drop warning is displayed by resetting the microcomputer. There is a risk of doing so.

Accordingly, a technical problem to be solved arises in order to eliminate the possibility of erroneous recognition by the user by displaying the battery exhaustion only when the voltage of the battery is low. The purpose is to solve.

[0007]

SUMMARY OF THE INVENTION The present invention proposes to achieve the above object, and outputs a reset signal to a built-in microcomputer when a power supply voltage of a remote controller falls below a reference level. In a battery consumption display control device of a remote controller which monitors an output of a voltage monitoring circuit and controls a display unit driving circuit at a reset to display a voltage drop warning, a second device having a longer time constant than the voltage monitoring circuit. A voltage monitoring circuit, and controls the display unit driving circuit when the output of the first voltage monitoring circuit is at a reset level and the output of the second voltage monitoring circuit is at a level indicating that the voltage is normal. And a controller for displaying the battery consumption of the remote controller.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below in detail with reference to the drawings. FIG. 1 shows a circuit of a remote controller. A key matrix circuit 2 and a display unit driving circuit 3 are connected to a microcomputer 1,
The matrix signal is input from the key matrix circuit 2 to the microcomputer 1 by the operation described above. The microcomputer 1 responds to an input signal by a display unit driving circuit 3.
And the display drive circuit 3 drives the transmission infrared LED 5 and the display LED 6 to perform transmission of the remote control signal, display of execution of transmission, and display of battery consumption and the like.

The first voltage monitoring circuit 7 connected to the reset port 1a of the microcomputer 1 comprises a general reset IC 1 and an output delay circuit including a capacitor C1 and a resistor R1. IC1 has a reference voltage generation circuit and a voltage comparator, compares the reference voltage with the input voltage by the voltage comparator, and switches the output state to Hi or Lo according to the comparison result.

The second voltage monitoring circuit 8 connected to the control signal input port 1b of the microcomputer 1 includes an IC2 of the same type as the first voltage monitoring circuit 7, an output delay circuit including a capacitor C2 and a resistor R2, and an IC2. Is constituted by a long time constant circuit composed of a capacitor C3 and a resistor R3 provided between the input terminal and the power supply, and is configured to change to Hi at a time later than the first voltage monitoring circuit when the power is turned on. .

The microcomputer 1 reads the state of the control signal input port 1b when the output of the first voltage monitoring circuit 7 becomes a reset level (here, Lo), and resets the voltage. Is high, the display drive circuit 3 is controlled to provide a warning display of a voltage drop by the display LED 6, and when Lo is low, a logical configuration is not provided.

FIG. 2 is a timing chart of the battery exhaustion warning operation in the circuit of FIG. 1. When the power supply voltage Vcc instantaneously drops below the specified level due to the transmission operation at the time of battery exhaustion, or when the power supply voltage Vcc drops due to other causes. When the voltage Vcc is momentarily interrupted, the output of the first voltage monitoring circuit 7 becomes Lo for a certain period of time and the microcomputer 1 is reset. At this time, the second voltage monitoring circuit 8 operates according to a long time constant. H
Since i is maintained, according to the above-described warning display logic,
The microcomputer 1 controls the display unit driving circuit 3,
The display LED 6 blinks to indicate a voltage drop.

FIG. 3 shows a timing chart of each circuit at the time of battery replacement. When the battery is removed, the output of the first voltage monitoring circuit 7 becomes Lo and the power-off state continues for a relatively long time. The output of the second voltage monitoring circuit 8 also changes to Lo after a certain time. At the time point a when a new battery is installed, the output of the first voltage monitoring circuit 7 is Lo, so that the microcomputer 1 is reset. Since Lo is maintained by a constant, no warning is displayed.

It should be noted that the present invention is not limited to the above-described embodiment, and various modifications are possible within the technical scope of the present invention, and it goes without saying that the present invention extends to those modifications. is there.

[0015]

As described above, the battery consumption display control device of the remote controller according to the present invention discriminates between a voltage drop due to battery depletion and a power cut-off when the battery is removed and attached, and issues a voltage drop warning only when the voltage drops. Is displayed, unlike a conventional remote controller, no unnecessary wear warning is displayed at the time of battery replacement, eliminating the possibility that the user may be confused with a battery failure or a remote controller failure, and improving reliability. And it has the effect of improving usability.

[Brief description of the drawings]

FIG. 1 is a circuit diagram of a remote controller according to an embodiment of the present invention.

FIG. 2 is a timing chart of a consumption display control when a battery is consumed.

FIG. 3 is a timing chart of consumption display control at the time of battery replacement.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Microcomputer 1a Reset port 1b Control signal input port 2 Key matrix circuit 3 Display drive circuit 4 Key switch 5 Transmission infrared LED 6 Display LED 7 First voltage monitoring circuit 8 Second voltage monitoring circuit

Claims (1)

[Claims] When a power supply voltage of a remote controller falls below a reference level, an output of a voltage monitoring circuit that outputs a reset signal to a built-in microcomputer is monitored, and a voltage reduction is performed by controlling a display unit driving circuit at the time of resetting. In a battery consumption display control device of a remote controller for displaying a warning, a second voltage monitoring circuit having a longer time constant than the voltage monitoring circuit is provided, an output of the first voltage monitoring circuit is at a reset level, and And a control means for controlling a display unit driving circuit to display a voltage drop warning when an output of the second voltage monitoring circuit is at a level indicating a normal voltage, and a battery consumption display control device for a remote controller. .