JPS5914794Y2 - Battery life display device for battery-applied equipment - Google Patents

Description

[Detailed Description of the Invention] The present invention provides a crystal battery life display device for battery application equipment using an inverted pulse V1, which includes a voltage doubler rectifier circuit 1 that extracts the inverted pulse V1 and outputs a voltage doubler signal 1a;
A battery voltage detection circuit 2 that outputs a battery life notice signal 3a when the battery terminal voltage v2 is detected to be below a certain value, and a battery life notice signal 3a that receives the battery life notice signal 3a and the voltage doubler signal 1a. This invention relates to a battery life display device for battery-applied equipment, which is provided with a gate circuit 4 that outputs a drive signal 4a only when the drive signal 4a is activated, and a display element 5 that is driven by the drive signal 4a. In battery-powered equipment such as battery-powered crystal clocks, it is possible to reliably drive display elements such as light-emitting diodes using the existing inverted pulse for time control, making it possible to reduce control and increase reliability. An object of the present invention is to provide a battery life display device for battery-applied equipment that can improve performance.

As shown in FIG. 4, a conventional battery life display device for battery-applied equipment is comprised of a power supply voltage detection circuit 2, a drive circuit 7, a display element 5 such as a light emitting diode, and the like.

In general, light emitting diodes are most commonly used to indicate the battery life of crystal watches powered by batteries, but since the operating voltage required for lighting a light emitting diode is approximately 2V or more, a light emitting diode such as 1.5V is used. For crystal watches driven at a voltage lower than the operating voltage, only a filament type battery life display device that consumes a large amount of current could be provided.

Furthermore, in devices such as quartz clocks that require precision, there is a serious problem in that a drop in power supply voltage reduces the precision of the crystal oscillator and the like, reducing the reliability of the time display of the quartz clock.

For this reason, a battery life display device that consumes relatively little current has been required for crystal watches that are driven with a low power supply voltage such as 1.5V.

The present invention can be provided in view of such problems,
An example in which the present invention is applied to a battery-applied quartz watch will be described in detail below.

As shown in FIG. 17, 6 is a commonly used bridge type drive circuit, which is formed to output an inverted pulse V1E for motor drive.

For example, the inverted pulse V1 is OV as shown in FIG.
With the positive and negative electric phases of 1.5■ and I Se as the reference level,
Approximately 0.5 Hz to 16 H with a pulse interval of c
A low frequency AC waveform of z is formed.

Reference numeral 1 denotes a voltage doubler rectifier circuit, which is composed of a rectifier diode D1 and a capacitor C1.
is received from the output terminals 6a, lb of the bridge type drive circuit 6, and outputs a voltage doubled signal 1a of approximately 3 cm, which is obtained by rectifying and doubling only the positive potential of 1.5 cm, as shown in FIG. It is.

Reference numeral 2 denotes a battery voltage detection circuit, which is connected to receive the battery terminal voltage v2 from the battery output terminals 2b and 2C to the base of the transistor Tr1 via resistors R1, R2, and R3.

When the battery terminal voltage V2 is above a certain value, that is, when the battery voltage has not reached the life warning voltage, the transistor Tr1 is in an on state, and the output terminal 2a of the battery voltage detection circuit 2
“It is a formality to be maintained in L9 Lebel.

When this battery terminal voltage (2) decreases below a certain value, that is, when the battery voltage reaches the life warning voltage, the transistor Tr
1 becomes below the threshold level, the transistor Tr1 is turned off, and the battery life notice signal 3a of the "H9+ level" is outputted to the output terminal 2a of the battery voltage detection circuit 2.

Reference numeral 4 denotes a gate circuit, which is configured with an AND gate, and receives the voltage doubler signal 1a from the output end 1b of the voltage doubler rectifier circuit, and receives the battery life notice signal 3a from the output end 2a of the battery voltage detection circuit 2. It is a pretense to do so.

And this gate circuit 4 is a battery life warning signal 3a"H"
It is assumed that the level is used as a gate pulse to pass the doubled voltage signal 1a.

Therefore, only when the voltage doubler signal 1a reaches the "H99 level", the light emitting diode 5 turns on and starts blinking at a frequency synchronized with the output frequency for the motor drive.

By replacing the light emitting diode with a display element such as a piezoelectric buzzer in place of the light emitting diode used to indicate the battery life of a crystal watch that uses a low power supply voltage such as approximately 1.5 V, it can be widely applied to low voltage battery-applied devices such as approximately 1.5 V. It can be applied.

The present invention includes a voltage doubler rectifier circuit that extracts an inverted pulse and outputs a voltage doubler signal, a battery voltage detection circuit that detects a battery life signal when the battery terminal voltage is below a certain value, and a battery life signal and voltage doubler signal. Since we have a gate circuit that receives the battery life signal and outputs a drive signal only when the battery life signal is on, we can double the voltage of the inverted pulse and use it as the display operating voltage of the display element, thereby providing a separate power supply for life display. The feature is that display elements such as light emitting diodes, which consume relatively less current than filament type display elements, can be used without using a display element such as a filament type display element.Furthermore, by using an inversion pulse, the display element can be used at a frequency synchronized with this frequency. This has the effect of improving economical efficiency by reducing current consumption and maintaining the life of batteries and the like for a long period of time.

Furthermore, by using the existing inversion pulse, it is possible to blink at a frequency synchronized with the inversion pulse, which has the effect of improving display performance.

Furthermore, as described above, by using a display element with relatively low current consumption, it is possible to prevent a severe drop in the power supply voltage for a certain period of time even after the battery life notice is displayed, and the battery life notice is displayed as before. This has the advantage that reliability can be improved by preventing a phenomenon in which the precision of the crystal clock itself decreases, which would cause a malfunction due to a decrease in power supply voltage at a relatively early time.

[Brief explanation of the drawing]

Fig. 1 is a circuit diagram of the present invention, Fig. 2 is an inverted pulse waveform diagram of the same as above, Fig. 3 is a voltage doubler signal waveform diagram of the same as above, Fig. 4 is a conventional circuit diagram, ■1 is an inverted pulse; Voltage doubler rectifier circuit, 1
a is the voltage doubler signal, ■2 is the battery terminal voltage, 2 is the battery voltage detection circuit, 3a is the battery life notice signal, 4 is the gate circuit, 4
a is a drive signal, and 5 is a display element.

Claims (1)

[Scope of utility model registration request] Crystal battery life display devices for battery-applied equipment that use inverted pulses include a voltage doubler rectifier circuit that extracts the inverted pulses and outputs a voltage doubler signal, and a battery life warning signal that outputs a battery life warning signal when the battery terminal voltage is detected to be below a certain value. A battery voltage detection circuit that outputs a battery voltage, a gate circuit that receives the battery life notice signal and the voltage doubler signal and outputs a drive signal only when the battery life notice signal is present, and a display element that is driven by the drive signal are provided. Battery life display device for battery-applied equipment.