JPS6223333A - Battery life warning apparatus - 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 (1) Industrial application field The present invention is directed to a power supply circuit C for battery-applied equipment such as an electric shaver.
: Battery life warning device that warns you when the battery capacity is low! t1: Related.

(b) Conventional technology The conventional 'ε battery application equipment C2 detects all drops in battery voltage and issues a battery exhaustion warning by blinking an LED, and is equipped with f2 spare batteries in addition to the main battery. There are devices that switch between the two batteries and switch to the spare battery when the Dl and ACD batteries run out. For example, as an example of the latter,
There is a "rechargeable small electrical appliance" disclosed in Japanese Patent No. 0-5875.

This publication (- indicates a power supply section that includes all of the first and second rechargeable batteries, a load to which power is supplied from the power supply section, and a connection between the rechargeable batteries supplying power to the load and the first battery or the second battery. It is equipped with a changeover switch for switching between alternative (:gJ), a charging section that enables 'fl! Source Seven Lights 4', and a plug blade section that connects the commercial AC power source and the charging ilS. In conjunction with the charging operation,
It is possible to forcibly switch between the switching switch and the 17th IC cell selection side C.

However, it is easy to overlook the ED display when the battery runs out, and spare batteries cost a lot more (=
This could not be called the best method as there was a risk of tying the knot.

? 9 Problems to be Solved by the Invention The problems to be solved by the present invention include not only a visual display means but also other warning means, and without using a spare battery. The objective is to develop a battery life warning device that can maintain its functionality.

Ninth means for solving the problem: battery voltage detection means for detecting the entire voltage of the battery; a motor driven by battery C2; a first switching means is inserted, and a predetermined voltage detection signal C of the battery voltage detection means;
As a result, the first switching means is fully controlled, and the battery and the motor are forcibly brought into contact. @2
It is equipped with switching means.

(e) To act. When the battery is consumed and the battery voltage drops to a predetermined voltage C:, the battery voltage detection means detects the voltage, and the battery voltage is temporarily stopped. When the second switching means is turned ON, the motor uses up the remaining capacity of the battery and starts driving again.

(E) Embodiment Hereinafter, the battery life warning device of the present invention will be explained in detail by referring to an embodiment of the drawings (part 2).

, FIG. 1 shows a power supply circuit for an electric shaver which is equipped with all battery life warning means. In the same figure (2), (1) is a step-down transformer T with a primary coil (2) connected to the commercial AC power supply I, and (3) is a secondary coil (4) (secondary coil) of the transformer T (1). The nickel cadmium taB, t6) connected via the rectifier diode D(5)Th is connected to the battery B(3) via the starting switch 51(7), which is connected to the DC motor "sQ" (I represents the battery). A resistance voltage divider circuit consisting of two resistors R1 (8) and R2 (9) connected in parallel to B (3), αυ is the resistance voltage divider circuit (midpoint (121
IC% Sumishi as a battery voltage detection means for detecting the voltage of the motor M (6) C: series (: connected nuclear motor M
Transistor Q2 as a first switching means for performing ON-OFF control in (6), α fathom is the transistor Q2
α stage≦: This is a transistor Q1 connected in parallel between the two poles of the electric current MB (3). The transistor Q2
The base of (13) is connected to the collector section of the transistor Q1 (14). C: Base resistance R4α51t
- What, and the transistor Q1α is @ IC (l
l)≦; When connected, C: base resistor 83 (le, and the pace of the transistor Q 1 u4)
A normally open switch S2αη is inserted between the emitters as a second switching means. Also, α second is the ICα
This is a variable resistor Vtt connected to υ for adjusting the detection voltage a14.

When the electric circuit having the above configuration is ≦2, turn off the start switch 51 (7) when photoelectric is used! If step-down transformer T (1) is connected to commercial AC power supply C: then diode D is connected.
An appropriate charging current is supplied from (5), and '1 battery B (3)
is charged.

When using the equipment, disconnect the step-down transformer T (11' from the commercial AC power supply and turn on the start switch 5l (71t). The battery voltage of battery B (3) at the beginning of use is high, and the engineering Cαυ is The output terminal ■ without 4+J is maintained at the 1L# level; therefore, the transistor Q1α4) is OF
F, therefore, transistor Q2αJ is turned on and motor M(6) starts rotating.

Eventually I! ta B (31 is consumed, and the 4 voltage of the 4 batteries decreases. When this battery voltage decrease reaches a predetermined value (:), the '4 voltage of the midpoint u21 of 11 becomes ICαυC2). Without much human effort, the IC (1U terminal ■ is 1L")
Changes to level 1-19. Then, the transistor Q1α is ONL, and the transistor Q2 (1 increase is ON).
The motor M(6) is switched from OFF to OFF, and motor M(6) stops. At this point, the user has only 1-2 units left for Den A B (3).
1P! Recognize that only J minutes of equipment usage remain.

Once the motor M (6) stops and at the 9th point, the 4th pond B (31'
If you want to use the emergency device for a short period of time, it is fine to use a photovoltaic switch (secondly, if you close the normally open switch Szanw, the transistor QIQ41 will be forced to turn OFF).
Transistor Q2 (13) turns on again and motor M (6)
drive again.

Figure 2 shows the 4-cell 4-pressure and Figure 1 A that correspond to the above operation 62.
, E is a diagram showing a change in voltage over time. time toe)
When the battery's positive pressure reaches the predetermined value Vs+2, the transistor Q11141 switches to 01"F or ONt2,
It is clear that the voltage between A and E rises rapidly (see Figure 2).

6 and 4 are examples of the application of the '1 circuit shown in FIG. 1C. In Figure 5C; (21J is the resistor R4 (
to) C: Parallel (: connected light emitting diodes LED
When the voltage of the battery B (3) drops to a predetermined value, the transistor QtC14) turns on (turns on) and lights up at the same time, and the light emitting diode LEDQIJ lights up and the motor M (6)
It is known that battery B (3) has no capacity left when the battery B (3) stops.

Further, FIG. 4 shows an example in which the normally open switch 52 (1'1 transistor Q2 (131) of FIG. 4 battery voltage detection means for detecting the voltage of the battery; a motor driven by the battery; a series circuit between the motor and the battery; first switching means for controlling the motor; When the predetermined voltage detection signal of the voltage detection means is ≦2, the first switching means is controlled;
A second switching means is provided to establish continuity between the tl& and the motor.(Secondly, it is possible to provide a backup power supply function without using an extra battery, which prevents miniaturization and cost reduction of the equipment. This creates the effect of being able to provide something that is not available before.

[Brief explanation of the drawing]

Fig. 1 is an electric circuit diagram of an electric shaver equipped with the battery life estimating device of the present invention, Fig. 2 is a time characteristic diagram of the battery voltage in Fig. 1 and the pressure between A and E, Fig. 3 and FIG. 4 shows the main circuits of other implementation circuits. Eight (3)...Battery, aυ...Battery voltage detection means, (6
)...Motor, (131...First switching means, 17)...Second switching means.

Claims (1)

[Claims] (1) A first switching means for motor control is inserted into a series circuit between a battery voltage detection means for detecting the voltage of a battery, a motor driven by the battery, and the motor and the battery; A battery life warning device comprising: a second switching means that controls the first switching means using a predetermined voltage detection signal and forcibly establishes conduction between the battery and the motor.