JPS5931463A - Display device of remaining capacity of charging cell - Google Patents

Abstract

PURPOSE:To measure the remaining capacity of a charging cell, by detecting a magnetic field caused by a DC current flowing through a wiring by a rotary head and displaying said field. CONSTITUTION:A part of the wiring from a charging cell 9 is brought close to the opposite side of a magnetic tape 4, the discharge from the cell 9 is discharged to a circuit of the cell 9 through (B) of a switch 6, and the charge from a charger 7 is performed through (A) of the switch 6 during charging. At this time, the magnetic field generated at the wiring 5 is proportional to the charging current. This magnetic field is detected by a rotary head 1 to be amplified 12. The polarity of this amplifying signal is discriminated by a discriminating circuit 13, a counter 14 performs up-or down-count by a discriminative output A, and the counted value is displayed by the display device 15 as the remaining energy amount.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application: It is used in portable v'l'I (etc.) to detect and display the charging energy of a rechargeable battery as an absolute value.

Conventional configuration and its problems The conventional method of detecting and displaying the energy porridge of rechargeable batteries is as follows.
Insert a resistor between the rechargeable battery and the charger or load, detect the voltage generated across the resistor when charging current or discharging current flows, and use a special memory element etc.
There was a device that displayed whether a charged object was discharged or not.However, in this case, a resistor is inserted in series with the rechargeable battery, so this part has the disadvantage that the characteristics of the rechargeable battery cannot be fully demonstrated. There was.

The main feature of the invention is to use the rotary head of the invention to increase the remaining capacity of the rechargeable battery to a total of 7i.

Structure of the Invention A part of the wiring from the rechargeable battery is provided close to the rotating head of the rechargeable battery-type Vi'H, and the magnetic field generated by the direct current flowing through this wiring is detected by the rotating head and displayed. It is equipped with a circuit to do this.

DESCRIPTION OF THE EMBODIMENTS Figure 1 shows a simplified head section of the rotary head type 'vTl (1) is a cylinder, (2) and (3) are rotary heads, and rotate.

(41 is a magnetic tape, (5) is a rotating head (2+(31
The wiring is placed close to the wires and is configured to allow current to flow between (a) and (b).

In FIG. 1, when S'i' Jl is in operation, either the rotary head (2) is recording or reproducing information on the magnetic tape, or the head (3) is not in the operating state. In this state, cut a part of the wiring (5) through which the current is flowing.
G, by providing it close to the head (3), the wiring (
The meandering magnetic field generated in 5) can be detected by rotating the head.

Also, since the head is rotating, the head (
Should I replace 21 and (:3) or both in this case? b Can be switched pneumatically or mechanically. That is, ~II+1
<The head on the side 4f which performs its own function (recording/reproduction) is configured so that it can always detect the DC magnetic field from the wiring (5). Incidentally, the position of the rotating head can be easily detected using a known technique.

In Figure 2, (1) is a cylinder, (21 and (3)
is a rotating head, (4) is a magnetic tape, (5) is a wiring provided close to the rotating head, (6) is a switch, (7)
is a charger, (8) is a circuit (power supply load) for each part of the beam i' l(), (9) is a rechargeable battery, (10) is a switch that is switched in synchronization with the position detection of the rotating head, (Ill is V
In the video circuit of TR, 02+ is an amplifier. First, as a function of V i'R itself, the video circuit (11
Rotating head +2 by signal from 1 or switch 00)
131 or magnetic tape (recording or reproducing operation is performed only when it is on the 41 side).

Next rotating head (1st success) V i' J (There is a period when it does not operate, and that is when it is in the opposite direction to the magnetic tape (4) side. From the head that has come to the opposite side, luJ It is wired to the input of the amplifier (12) by a switching switch (a switch for detecting the position of the head, which is configured to repeat ON-RILL ``■'' when the head reaches a predetermined position). On the other hand, a part of the wiring from the rechargeable battery (9) is connected to the opposite side of the magnetic tape, and a part of the wiring from the rechargeable battery (9) is discharged into the circuit of the rechargeable battery (9). ).Firstly, when charging, the charging current flows from the charger (7) to the switch (
It flows through (a) to (river) of the wiring (5) through the wiring (5). At this time, the magnetic field generated by the wiring (5) is proportional to the charging current.

When this magnetic field is detected by the rotating head, it will generate a magnetic field as shown in the chart in Figure 3. (However, it is necessary to keep the rotating head in operation even when the original function of V i' H is not performed during charging.) . Masu Mitsuru? l flow is 1. .

The period between ~ [ and l indicates a state in which there is no flow, and at this time, even if the head is rotating, no magnetic field is generated in the wiring (5), so no output is made to C6. Next, if +1A of the charging current flows between 1.1 and C2, the magnetic field of the wiring (5) will be generated in an amount corresponding to +LA, and the voltage (current) detected by the head will be transferred to the amplifier (12; It is amplified by 00 or pulsed. Also, between L2 and t3, the
If we assume that A and Af are connected by a slight increase in the current, the magnetic field of the wiring (5) will also increase by the same amount as the current. 0
The output is increased by the amount of current increased.

Also, under the conditions in Figure 3, the first pulse (A) of (3C) is ■
It starts in the direction (B) and ends in the ○ direction, and this state is repeated. (A) is the time when the rotating head or the wiring (5) enters the magnetic field, and (B) is the time when it moves away from the magnetic field. (This state is due to the head winding direction and wiring (
5) The polarity may be reversed depending on the mounting direction (an example is shown).

FIG. 4 shows a chart for discharging the rechargeable battery.

The operation starts from the rechargeable battery (9) through the wiring (5) and the switch (6).
) flows to the Ir1l path (8) [load] via (13) and is discharged. Since a current flows through this first wiring (5) in the opposite direction to that during charging, the direction of the magnetic field is reversed, and the operation is the same as during charging. However, the polarity of 0o is reversed.

Next, use the pulse output at 00 to repair the rechargeable battery.
A method of displaying the rugie h1 will be explained.

First, FIG. 5 shows an example of counting and displaying the pulses outputted by the third clock. (', is connected to 00 in FIG. 2, and the pulse 1'''0 in FIGS. 3 and 4 is applied.

(13) is a circuit that determines the polarity of the pulse of L'o ('i), which determines whether the polarity of the pulse generated at '+1, ■, or e is output. fA]
It is a circuit that can obtain a level corresponding to the state (for example, if ■ is first, it is 1-1; if ○ is first, it is L).

Depending on the state, [''1'', D (JWN type counter (1
41 to count LI P or count 1) U\
bring to ~ For example, if the polarity is 80 when charging, the count is UP, and when the polarity is 00 when discharging, the count is UP. Since it is energy and the same amount of energy can be used during discharge, it can be seen that the energy M is counted 1) (remaining by making JWN) under the same conditions.

This display is displayed on the display (151 line 1.1).

Next, FIG. 6 shows a means for achieving higher accuracy.

The waveform of efl shown in Figs. 3 and 4 is added to Ll, as shown in Fig. 2, and the waveform of efl shown in Figs. Select (rectify) any one of the 11 levels of e, hold the maximum level of tfliB or its corresponding level (average value or effective value) as -11, 41, and set the output to voltage ( Current) is input to the controlled oscillator t171, and the frequency of the oscillator is changed depending on its level.Next, the oscillation frequency obtained by this oscillator is input to the UP, I) (J W N counter (18), and the count [J l' or count DO~'N.

The selection of count UP and count D (J W N is performed by the polarity discrimination circuit (19), and the operation is the same as that shown in Fig. 5. When charging or discharging, the switch ( 6) is operated manually or in conjunction with a charging connector, etc., so the count U1 is
' and count I) (You may switch between C and N)
. The output of this counter is shown on the display (20!).

The display contents are the same as in FIG.

The purpose of detecting the 0I level is, for example, when a quick charge is performed, the charging current is large and the battery can be charged in a short time.
This is because the same charging energy can be obtained as when charging with a weak current for a long time, so even if the energy is the same, high accuracy cannot be obtained if there is a difference in the count Ul'. Therefore, "n (c
'i) is proportional to the peak value of (A) or (B) or the current ζ as shown in the diagram 00 in Fig. 3. This voltage level is detected and held and the voltage (current) tlt controlled oscillator +1
By inputting 7N, a frequency proportional to the current can be obtained. For example, if the voltage of 0 when charged with IA for 16 hours is set as a~, then the oscillation frequency of the old voltage (current) lubricant J oscillator is 111z Te, L Tsudato th+; JI X
16 x 3600=! It will count 17,600, and if it is charged at 2A for 8 hours, the voltage of 00 will become 211V and the oscillation frequency will also double, 2117.
becomes. Therefore, 2. x 8 x 36002 5760
Since the count becomes 0 and the charging energy 111 is the same, the same display is performed.

Next, during discharging, the output (Δ) of the polarity discrimination circuit (1!II is inverted with respect to the charging state, so Ll l'', 1)
Counter (+81i: t counter -13 (switched to 'N, subtracted power corresponding to the energy 11 required for discharge). For example, if IA is discharged for 16 hours, I'lil will be recorded. The count becomes 57,600, and in this case, it is a subtraction, and if it is used for this time, the energy will be 0 and 4.

However, in this case, it is ideal for a rechargeable battery, and in reality, considering efficiency, it is necessary to have a means to make the oscillation frequency during charging and the oscillation frequency during discharging a level of 0 (), or even if they are the same, there is a slight difference ( For example, when using resistor division and connecting the level of .0 to c, the level during charging and the level during discharging can be changed).

Next, a method for integrating pulses detected by the head and displaying them in analog form will be explained using an example. FIG. 7 is a circuit diagram. 00 in Fig. 2 is connected to i, and the polarity discrimination circuit (
21) to detect whether it is charging or discharging (same as the explanation in FIG. 5I), and its output activates the contact section). When charging, switch on the )mu side (,
Pulse generated at +;
, the capacitor i is charged and the result is transferred to the amplifier C,,!
8+ C high input impedance),
The output is expressed by a display meter (2!l+ (voltmeter)).

In the chart of Figure 8, for 10 to 1'1,
It shows a state where neither charging nor discharging is being performed, and since the input from the head is f4, there is no input to (4) either. Therefore, the display on the display meter (29) is also O, and '.1 to I
When it reaches 2, it indicates that charging is flowing.

At that time, the display on the display meter (2!) increases every 07 pulses. Also, between 12 and 1゛3, it indicates that the battery is being charged with a current of 2XA, and the display at this time is twice as large as when it is 1.1-12. . Next, between 3 and 4, charging is completed and the battery is on standby for discharging or is not in use, and there is no input to CI. Therefore, the display also holds the value displayed with 1゛3 points (appears on display J1, f,
) and may be displayed on display R1 as needed). Next '4 J21. (& represents the state at the time of discharging, and a signal whose phase is inverted from that at the time of charging is input to f77. Therefore, it is detected by the polarity discrimination circuit (21), and the contact (22) is set to (1))
1.7J in the direction of , the capacity [11 elements (25) is charged]
The output voltage is divided into 1111 parts by the resistor (2fil) and gradually discharged through the diode (27). This state is shown in 1'4 to 5' (5) in Figure 8. Here, 1
Since the pulse level of (81) is smaller between 5 and 5 than between 5 and G, the discharge indicator ((2!+1 display)) of the customer element is smaller, and becomes larger between 1'5 and 1'6.

After t6, it is in a dormant state (after using V i'H),
The level displayed on the display meter (2!11 is (a) in Figure 8)
It can be seen that the remaining level is (A) and that it is possible to use the rechargeable battery until the level (A) or O is reached. Same 2nd a
The method of taking out signals from the rotary head indicated by 1 is just one example, and any known technique can be adopted for the method of taking out signals from the head, whether it is a brush type or a rotary transformer type.

Effects of the Invention Depending on the amount of energy charged in the rechargeable battery, V i'1
The useful time is displayed, so you can use it with confidence without worrying that the rechargeable battery will run out at unexpected times. Also, a special memory element (for example, an elephant button to memorize the remaining capacity of the rechargeable battery) is used for convenience.
However, by using a part of the rotary head used in the V i'H, reliability can be improved and it is also advantageous in terms of cost. The circuit can also be made smaller by using an IC or by using a part of the memory circuit of a microcomputer.

[Brief explanation of the drawing]

Fig. 1 is a perspective view of the rotating head, Fig. 2 is a circuit diagram of the device of the present invention, Fig. 3 is a pulse waveform diagram during charging, Fig. 4 is a pulse waveform diagram during discharging, and Fig. 5 is a pulse waveform diagram during discharging. Display circuit diagram,
FIG. 6 is a circuit diagram showing another embodiment of a pulse display circuit, FIG. 7 is a circuit diagram for analog display of pulses, and FIG. 8 is a pulse waveform diagram during charging and discharging. (2+(31... Rotating head, (5)... Wiring, tJ
41 (181...Counter, (lfil...Peak value hold circuit, (17)...Voltage (current) controlled oscillator, (25)...Each group element, (I 5+ (2(II)
...Display device, (2!11...Display meter agent patent attorney Irishima -Ko 1 concavity 1 Fig. 2 Fig. 3 Fig. 4 Fig. 5 Fig. 6 Fig. 8

Claims (1)

[Claims] 0) A part of the wiring from the rechargeable battery is provided in the vicinity of the rotating head of the rechargeable battery-type v 'l' H, and a magnetic field is generated by the direct current flowing through this wiring. A display device with a remaining capacity of a rechargeable battery, characterized in that a circuit is provided for detecting and displaying the remaining capacity of a rechargeable battery using the rotating head. (2) The magnetic field detected by the rotating head is rotated as an indicator with 11 blades. Counting the number of pulses generated corresponding to the number of rotations of the head, 1. )
(J W N-type counter circuit is used to display the remaining area of a rechargeable battery according to claim 1. A peak value hold circuit that partially holds the ratio level, an electric ratio or current controlled oscillator that changes the frequency depending on the level, and a counter that counts the oscillation frequency obtained during charging, and then inputs the oscillation frequency obtained during discharging. The first aspect of the present invention further comprises a circuit for calculating I from the value counted by the counter according to the vibration frequency and displaying this subtraction process.
Remaining capacity R7-11i display device of the rechargeable battery described in Section 1. (As a circuit that displays the magnetic field detected by the 41 rotary head, the voltage level or pulse depending on the strength of the magnetic field is charged to the capacitor 11: element when charging, and the voltage level detected by the rotary head to the capacitor when discharged. 11. The remaining capacity meter display device for a rechargeable battery according to claim 1, further comprising a circuit for displaying the energy charged in the 111 elements.