JPS5888674A - Detecting apparatus of battery charging - Google Patents

Abstract

PURPOSE:To detect a charging condition by the time elapsed indicating below battery voltage, comparing a R, C integration circuit applied higher voltage than the maximum charging voltage of a battery to be charged and battery voltage while this circuit is discharged temporarily and is charged. CONSTITUTION:A battery to be charged 4 is connected between terminals 1a, 1c of a charging electric power source 1 through a current reduction resistance 2, 3. Further, a quick charging line is formed by a transistor 5 and a trickle charging line is formed by the resistance 3. An integration circuit 13 of a resistance 11 and a capacitor 12 is provided between a high voltage terminal 1b and a earth terminal 1c and a discharge circuit of the resistance 14 and a transistor 15 is provided between both ends of the capacitor 12. The voltage of the capacitor 12 and that of the battery 4, are compared in a comparison circuit 7 and its output is supplied to a detection controlling circuit 18. The charging condition of the battery is detected by measuring the time elapsed in the case where the voltage of the capacitor 12 is lower than that of the battery 4 regardless of the magnitude of an inclination gradient of a charging voltage characteristic of the battery.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a 'battery charge detection device (regarding this, it includes an integrating circuit of a resistor and a capacitor to which a voltage of one current higher than the maximum optical impulse of the battery to be charged is applied); , a discharge circuit for temporarily releasing the charging surface of the capacitor, and a discharge circuit that causes the integrated voltage of the capacitor to drop once to the charging voltage of the battery and then rise again. While the integral 'Ichikawa' is smaller than the optical heavy voltage, the comparator circuit producing an output is
Furthermore, it is an object of the present invention to provide a device for detecting the state of charge of a battery based on the length of the output period.

When a sealed battery to be charged, for example, a 2000m cadmium battery, is charged, as the charging time progresses, the charging voltage characteristic m of the battery rises and reaches a peak point li.
Do a postfix C that shows +. At this reduced chain acid, the charge amount characteristic +III becomes saturated (full light). Also, the peak point fi
From around the time of 1, the temperature characteristics of Tonike began to rise.

In view of these characteristics, charging voltage detection methods, battery temperature detection methods, and the like are used to detect the state of charge of batteries.

The battery temperature detection method can detect a predetermined vomiting state after the peak point (tp) by selecting the detected temperature,
In particular, the amount of charge can be ensured by detecting the temperature at the saturation point (tf) of the charging longitudinal characteristic 1111. However, the temperature 1y detection method is affected by the ambient temperature, so temperature fluctuations (response to
C Charged *'a The battery is always in a predetermined state of charge (cannot be rubbed).

The light weight voltage detection method uses the peak point (1-L up to January).
- It detects the sudden battery voltage, and is widely used because it is easy to detect. However, the voltage detection method detects the Ichiura Fri pressure after the peak point (1). Because it is difficult to detect, it is generally not possible to secure a sufficient market for charging.An application of this voltage detection method is the differential value construction method, which detects the differential value of the charging voltage. The battery's voltage is detected and memorized, and the voltage after a short period of time is detected and stored.
11 Sea --- Hiso ≠ H shadow 1#, 1jλ・
After time, compare the voltage of -'@relaxation 1 ←ヰYokoyogyu'C memory ゛tun voltage, and compare the ax voltage or +'il['re value by 1. (The point in time (tp
It is possible to detect the full '4↓ state after J. However, it is difficult for these standard voltages to appear when the slope of the charging pressure characteristic I11 is small.

The present invention was invented in view of this point. This is to detect the so-called increase [1]C of the battery voltage, and it is possible to detect the voltage even when the slope of the charging voltage characteristic is small.It is configured as follows. That is, an integrating circuit consisting of a resistor and a capacitor to which a direct current pressure higher than the maximum charging voltage of the wave-light battery is applied, and a discharging circuit that temporarily discharges the charged voltage of the capacitor. From this circuit number, the integrated voltage 'f!: +tl' of the above-mentioned condenser is temporarily lowered below the charging pressure of the battery, and then rises again by t.While the integrated voltage DiJ is smaller than the recorded light weight voltage, the output is output. Ail
The charging state of the battery is detected from the length 1 between the outputs.

A specific example thereof will be explained based on FIG. In this drawing, C, il+ has a light duty source φC1 charging terminal (1aJ), a high voltage terminal (1b) that supplies a voltage higher than the voltage of this terminal, and a ground terminal (1).

The light heavy terminal (1a) and the ground terminal (1a) are connected to -C charged storm current 7II2+4 via current reducing resistor L21 +3+.
1 or connected.

A first transistor (5) is connected between both ends of the current reducing resistor (3).
The emitter-collector of the first transistor is connected, the first transistor forms a rapid light path, and the current reducing resistor (3) forms a trickle light path. The base of the first transistor (5) is connected to the Cγ-base terminal (1) through the resistor (6) and the collector-emitter of the second transistor (7).
1! A voltage dividing circuit from resistor (δ1ti31 to ff) is provided at both ends of +41, and a voltage (V) corresponding to the charging voltage of the '+li battery appears at the voltage dividing point (10).

In addition, between the pressure terminal (1) and the T-slip 1 (1C) (this is the resistance flu and the capacitor (121), the integrating circuit (1
3) is provided between both ends of the capacitor t+Z, ]I
A discharge circuit (Ilil) is provided in which the collector and emitter of the L resistor (4) and the third transistor (15) are connected in series.

(17) is a comparator circuit, and the negative terminal f-+ of C1 is applied with the integrated voltage (V) of capacitor d21, and the positive terminal (this is the voltage dividing point t) 01's heavy oil corresponding voltage (V) is applied. When the integrated Ji pressure is lower than the Ichiura corresponding voltage, the comparison output is set to high level.The capacitor (121) is charged
The kL current is temporarily stopped by the discharge circuit (C6), and the integrated voltage of C1 drops below the voltage corresponding to the battery.
Also, the surface pressure of the terminal (1-1) increases significantly due to the light from the terminal (1-1).

■81 is the detection 1h control circuit, and C1 is its first terminal 1al.
is the second transistor (7) 1υ base plate, second terminal +
b+ is the output terminal 1 of the comparator circuit (]7), and the third terminal 1cl
are respectively connected to the base of the third transistor (15).

Before explaining the operation of the +ah configuration, the capacitor (12
The relationship between the (responsible voltage) of 1 and the output of the comparator circuit aη is explained. Figure 3 (a) is a photodischarge characteristic diagram of the capacitor 121, and +DIl'M in the figure shows a comparison for different battery voltages. These diagrams show the output waveform diagram of the circuit.In these drawings, the integrated voltage (VcJ) of the capacitor 1121, which is charged up to V at the high-voltage terminal (1b), is the voltage at the time (from L to Until (Si2'), Hakuichi circuit (1G)
The battery is discharged and charged again from that point (t, 2'). , that is, due to the conduction of the third transistor t151fυ, the charging surface of the capacitor 1121 is discharged due to the capacitor (1"lI) and the resistor (141), and the charging surface of the capacitor 1121 is discharged at the time (t
2') is charged with C by the time constant of the capacitor (121) and the resistor ill.

Now, when the voltage corresponding to the battery is (V+++), the outputs of the comparator circuit L171 are io1 and r4 in Fig. 3, and when the voltage corresponding to the battery X is (VB2) (the outputs of the comparator circuit are 1 and f,
Fru.

In this way, the 'I/LI Mf pressure or Ll's corresponding voltage is,
The length of this output period is determined by the quality of the output period of the comparator circuit (lη).
・The saw is taken out.

The above is the center of the operation on the control circuit.
The system (1111) shown in FIG.
Explanation of flow rate Y-me value C. First, it is assumed that the charging voltage characteristic of the battery (4) is the characteristic II+ in Figure 4.
Mon/il - Activate. f: “Clear setting”’ (B)
This setting is made at the same time as the counter (dl, counter memory +il+ and number memory tj'l'il-) of the detection port, circuit 11 and 17, also il, '1 blood 11
This is to set the output of the first and third ":hi child (・slo+) to 10-" by hl. Such initial setting 1B+
When it is completed, the Ryo J” IRj point (Il in the
From l 1111 +, the output of the first terminal ta+ becomes "high" and from l, the conduction of the transistor 5) e
1, and the second and first transistors +71151 are conductive.
)I! I'l be started. From the beginning of charging 14 to 114 (the 78th L battery's voltage characteristics differ depending on 'Mt/ll!), especially for batteries that have been left for a long time with discharge light, only the initial stage of charging is compared as shown by the dashed line in Figure 4. The target voltage shows the characteristic + II.
The voltage drops to the level of a normal battery, and thereafter exhibits pressure characteristics similar to those of a patient who has stopped vomiting. Therefore, until the time point (tl) when the characteristic I11 coincides with .

After that, from Enoki's command t/Ji for the side sail control circuit, the ``transistor + 51 cutoff'' operation EI and the ``discharge'' operation +
Perform Fl.

This discharge operation +Fl is A1<(P1
) seconds, and from the end point r (Mo2), the voltage terminal (1
The capacitor (Ia is charged with the time constant of the resistor (111) towards the pressure (V) of the capacitor (Vc).
Until t5, the output of the comparison circuit's "comparison I" operation O+ is at a high level fHI, and the length of that period (f゛2) is calculated by the detection side m1jl' = U path 181 yen counter + dl. C measurement (“Counter Increment” by o (J
)) will be done. That is, for example, by counting how many pulses are generated every 10 microseconds during a period ('r), the length of that period is measured. 0 force output or mouth = level fLI and tl,
"L-Lano resistor (5) conduction" operation fKl via C1
The counted value of counter +dl and the stored value of counter memo January e) are compared in the "comparison HII operation tMl. Initially, the stored value of counter memo January 8) is zero, so The count value of the J counter tdl is large. Therefore, the "ratio Vi11" operation tM+ outputs a large output, and the count value is "stored" (N) in the counter memory (θj). Through the operation +01 and the ``clear counter'' operation IPI, the ``C1 timer + kl f 1 timer - 11'' operation iQ+ is generated.

The timer one time iTl is, for example, 10 seconds, and after the elapse of that time, the operation returns to "cutting off the transistor 5" again. From this operation tEl, “Compare ■” operation ++4
The feedback loop passing through the output of 1 is smaller than the counted value of counter ldl or the stored value of counter memo 1/el.
, that is, until the bead point fil is reached (not shown in FIG. 4). After the peak time (tl), the "comparison 11" operation amount is the count value of the counter ldl or the counter memo January al.
Since rS is smaller than the stored value, the output? Depends on jl and f.

The number of times this output 1tJj is output is incremented by 1 + l (l) The number of times the iron is memorized is stored. If the number of times is a set value, for example, 5 times, the number of times the output is reached is
"Comparison ■"'' Output of operation 1 is (NO) and r (S, through "counter clear γ" operation + PI -C" transistor (5
)'s "interruption" operation (returns to uniformity. This output (returns to uniformity). This output (from N0, the number of repetitions is 4 rows fl), and the subsequent "number of increment" operation (when I() counts 5 times, the "comparison ■'" operation + S + Output force (YES) Door J: '), rt
/II! +41 LD desired charging state has been detected (
This, f, “transistor (blocking of 51”) operation tu
After t, the battery charging operation is completed.

Figure 6 shows a modification of the integrating circuit (131), in which a resistor (11 and constant voltage element 120) and a heavy pressure circuit are added, and the charge/discharge characteristics of the capacitor (121) are The output waveform of the comparator circuit (17I) when the market voltages Vr (V!H) and (VB2) are shown in Figure 7 (Figure 7). According to the embodiment, the variation in the capacitor voltage is close to the battery voltage (for example, the range of (VB2)), so it is difficult to measure the length of the output period of the comparison circuit 11nl. Compared to the embodiment shown in FIG. 2, the resolution can be increased by <11 points.

As described above (according to the present invention), the integral direct voltage of the capacitor is changed to the integral direct voltage of the four batteries by the discharge circuit, the charging voltage of the four batteries decreases once, and then rises again by one. When the curve is smaller than the charging voltage, an output is generated from the comparator circuit, and the filling state of heavy oil is detected from the length of the output curve. Regardless of the size of the slope of 4-1'City/11!+-1'
j state can be detected.

[Brief explanation of the drawing]

Fig. 1 is a charging characteristic diagram of heavy oil, Fig. 2 is a nausea circuit diagram showing an embodiment of the device according to the present invention, and Fig. 3 (a) is a charging/discharging characteristic diagram of a capacitor. The output waveform diagram of the old comparison circuit is shown in Figure 4. Figure 4 is the voltage characteristic diagram for battery charging.
Figure 7 is a tu'A circuit diagram showing another embodiment of the integrating circuit.
Figure (A) is a charging/discharging characteristic diagram of the capacitor in the integrating circuit of Figure 6, and 14 and kN are output waveform diagrams of the comparison circuit. i41...hemitsujusojun, till...resistance, (12
1... Capacitor, (131... Integrating circuit, +161
...Hoichi circuit, tl'/l...comparison circuit. , flight, @, W Kano V-・9me・→ U-〕

Claims (1)

[Claims] In addition, there is an integral circuit of a resistor and capacitor to which a direct current voltage higher than the maximum charging voltage of the charging pond is applied, and a discharging circuit that temporarily discharges the charging light of the capacitor. Then, the discharge circuit once lowers the integrated pressure of the battery to the charging voltage of the battery, and produces an output while the integrated pressure that rises again is smaller than the voltage. 1. A battery charge detection device, comprising: a comparison circuit, and is configured to determine the state of charge of the battery according to the length of the output period.