JPH117940A - Erroneous battery mounting detection circuit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily detect erroneous battery mounting. SOLUTION: This erroneous battery mounting detection circuit comprises a first voltage detector means 21 for detecting the voltage Va half as high as the source voltage V of batteries 2 to the number of 2N, where N is an integer, connected in series which voltage V is applied to the load and used there; a second voltage detector means 22 for detecting the intermediate voltage Vb of the source voltage lead out of the ends of the series-connected batteries 2 to the number of N; a voltage determiner means 23 for determining whether those voltage values detected by the first and second detecting means equal each other; and a controller means 24 adapted to be controlled upon a determination output representing that those first and second detected voltages are unequal to each other. While the normal mounting of all the batteries 2 equalizes Va and Vb, erroneous mounting of any battery 2 in polarity leads to the action of the terminal voltage of that inverted battery as a voltage reducing source unequalizing Va and Vb, which state triggers such a determination output from the determiner means 23 for easy and reliable detection of erroneous battery mounting.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a battery erroneous mounting detection circuit. Specifically, when a plurality of batteries are connected in series as a power source for an electronic device, even when the batteries are incorrectly installed, the power supply voltage applied to the load side and the voltage at an intermediate position of the batteries connected in series are determined. Erroneous mounting of the battery can be easily and reliably detected by monitoring the battery.

[0002]

2. Description of the Related Art In a battery-equipped electronic device such as a boombox, a plurality of batteries are connected in series to generate a driving power supply voltage. In the example of FIG. 3, a total of 9.0 V power supply voltage is obtained by using six batteries (N = 3) having a terminal voltage of 1.5 volts (V). In this example, three battery boxes are arranged in parallel, and the positive and negative electrode terminals 8 and 12 and the negative electrode terminal 1 each have elasticity.
0, 14, terminals 8 and 10 are directly connected,
The output terminals 16a and 16b are load-side voltage supply terminals.

[0003]

Regarding the battery 2, whether it is a primary battery or a secondary battery, the positive electrode side (plus side) is formed as a protruding electrode 4 and the negative electrode side (minus side) as shown in FIG. ) Are flat electrodes 6. In recent batteries, the flat electrode 6 tends to slightly project from the battery body 2a as shown in the figure in order to increase the battery capacity. Therefore, when the two batteries 2 are connected with the flat electrodes facing each other, the two batteries become electrically conductive.

As a result, when a plurality of batteries 2 are used in series connection as shown in FIG. 3 and the batteries 2 are erroneously mounted, the following problems are caused. The example of FIG.
The case where only one of 2F is connected with the wrong polarity is shown. As described above, even when the battery 2E is installed with the wrong polarity, the battery circuit is not cut off.
Between a and 16b, the terminal voltage is lower than that in the case of correctly mounting, but a voltage of (5 × 1.5) V− (1 × 1.5) V = 6.0V is obtained.

On the other hand, in the case of an electronic device such as a boombox, even if the terminal voltage (power supply voltage) decreases due to the consumption of the battery 2, it is ensured that the device operates normally up to, for example, about 65% of the rated voltage. Often have been.

In the above example, the electronic device operates normally until the terminal voltage drops below 9.0 V × 0.65 = 5.85 V.

[0007] Therefore, as shown in FIG.
Even if (2E) is installed with its polarity incorrectly,
The electronic device operates normally. This means that current also flows through the erroneously mounted battery 2E. In other words, the battery 2 can be used as a power supply despite being erroneously mounted. In such a case, the device operation assurance voltage may be set to 65% or more. Otherwise, the user is notified by a buzzer or the like that the battery is incorrectly mounted, or the power supply circuit is forcibly cut off. Is more preferred.

Accordingly, the present invention has been made to solve such a conventional problem, and is intended to easily and reliably detect an erroneously mounted battery.

[0009]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, in the battery erroneous mounting detection circuit according to the present invention, 2N (N
) Are connected in cascade to be used as a power supply voltage on the load side and one of the power supply voltages applied to the load side.
/ 2 voltage detecting means for detecting an intermediate voltage of the power supply voltage derived from the N battery terminals.
Voltage detecting means, voltage determining means for determining whether the first and second detected voltages are substantially equal, and first and second voltage detecting means.
And control means controlled by a discrimination output when the detected voltages are not substantially equal to each other.

According to the present invention, 1/2 (= Va) of the terminal voltage V of the series-connected batteries is detected, and the terminal voltage Vb of N series-connected batteries of the 2N batteries is detected. If Va = Vb, it is in the normal mounting state. If Va ≠ Vb, one of the batteries is incorrectly installed. This is because the terminal voltage of the erroneously mounted battery acts as a reduced voltage source. When it is detected erroneously, the user is notified by a buzzer, the display is displayed on the display, or a relay or the like is operated to turn off the power switch and disconnect the power circuit.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, an embodiment of a battery erroneous mounting detection circuit according to the present invention will be described in detail with reference to the drawings.

FIG. 1 shows an embodiment of a battery improper mounting detection circuit according to the present invention, in which 2N (N is an integer) batteries are connected in series and 2N × (one electromotive force = terminal voltage) An electronic device such as a boombox is driven by a battery voltage of (volts). The illustrated battery box used in this electronic device includes N batteries connected in series for 2 batteries.
A configuration in which they are juxtaposed in rows (the same as in the past) is employed.

In the example described below, a total voltage of 9 V (= 1.5 × 6 volts) is used as a power supply voltage using a total of six batteries (primary batteries or secondary batteries) 2A to 2F. . Therefore, four positive and negative terminals 8, 10, 12, 14 are used, and output terminals 16a, 1
The terminal voltage obtained at 6b is supplied to a load (not shown) as a power supply voltage.

In the present invention, the two output terminals 16a, 16
A first voltage detecting means 21 for detecting a half of the terminal voltage V is provided between the terminals b. In this example, a pair of voltage dividing resistors R and R having the same resistance value are used, these are connected in series between the output terminals 16a and 16b, and the output terminals 16a and 16b are connected from the connection point of the resistors R and R.端子 (= Va) of the terminal voltage V obtained in between is detected.

Similarly, the terminal voltages of N terminals connected in series are detected by the second voltage detecting means 22. In this example, since N batteries are connected each other, a voltage detection terminal is derived from an intermediate point P between the three batteries. Therefore, three batteries connected in series from the intermediate point P, for example, battery 2D
The sum Vb of the terminal voltages for .about.2F is detected.

The first and second detection voltages Va and V
b is supplied to the voltage determining means 23, and the detection voltages Va and Vb
Are not equal, a high-level discrimination output is obtained in this example. The discrimination output is supplied to a control transistor Q, and the operation state of the control means 24 is controlled by the control transistor Q. A buzzer as the control means 24,
Means such as an error message display, a power switch control relay, and the like are conceivable.

When all of the six batteries 2A to 2F are normally mounted, the terminal voltage of one battery is set to V.
Assuming x, the terminal voltage becomes V = 6 × Vx (volt), and Va = V / 2 Vb = 3 × Vx.

When Vx = 1.5V, Va =
4.5 V, Vb = 4.5 V, and the voltage discriminating means 23
Then, a low-level discrimination output is obtained. When the discrimination output is at the low level, the control transistor Q remains off, so that the buzzer as the control means 24 does not operate, and no error message is displayed on the display. In the case of a relay, it does not operate because it is not energized.

On the other hand, as shown in the figure, when the center battery 2E is mounted with the opposite polarity, the terminal voltage of the incorrectly mounted battery 2E acts as a reduced voltage source. Is V = 9.0V-3.0V = 6.
0V, and as a result, Va = 3.0V.

On the other hand, since the terminal voltage of the battery 2E similarly acts as a reduced voltage source, the second detection voltage Vb is
b = 4.5V-3.0V = 1.5V.

In other words, Va 状態 Vb
Becomes

Since this voltage imbalance state is detected by the voltage discriminating means 23, a high level discrimination output is obtained only at this time, and the control transistor Q is turned on by this discrimination output to control the control means 24 to the operating state. Is done.
For example, a buzzer operates. When a display is used, an error message or the like is displayed on the display. If it is a relay, this relay operates.

FIG. 2 shows an example in which a relay 25 is used as the control means 24. A normally-on relay is used as the relay 25, and a power switch 26 controlled by the relay 25 is connected to a power supply path. They are connected in series. The power switch 26 is normally on.

When the control transistor Q is turned on, the relay 2
The current to 5 flows, and the relay 25 is energized, and the energization turns off the power switch 26 only at this time. As a result, the power supply to the load is cut off. When the battery 2E is mounted with the correct polarity, the control transistor Q returns to the off state, and the power supply path is restored to the original state, so that the electronic device operates normally.

The number N of the above-mentioned batteries is arbitrary. The electronic device to be applied is not limited to a battery combined device such as a boombox. An electronic device used only with a battery may be used.

[0026]

As described above, in the battery erroneous installation detection circuit according to the present invention, 2N (N is an integer) batteries are cascaded and used as a power supply voltage on the load side.
First voltage detecting means for detecting a half of the power supply voltage applied to the load side, second voltage detecting means for detecting an intermediate voltage of the power supply voltage derived from the N battery terminals, It comprises voltage discriminating means for discriminating whether the first and second detection voltages are substantially equal, and control means controlled by a discrimination output when the first and second detection voltages are not substantially equal. is there.

According to this, since the erroneous mounting state of the battery can be easily and reliably detected, the following equipment protection measures which must be implemented due to the erroneous mounting can be ensured. Therefore, the present invention is very suitably applied to an electronic device using a battery such as a boombox.

[Brief description of the drawings]

FIG. 1 is a system diagram of a main part showing one embodiment of a battery erroneous mounting detection circuit according to the present invention.

FIG. 2 is a system diagram of a main part showing a specific example of a battery erroneous mounting detection circuit according to the present invention.

FIG. 3 is a diagram when a battery is normally mounted.

FIG. 4 is a plan view of a battery.

FIG. 5 is a diagram when a battery is incorrectly mounted.

[Explanation of symbols]

 2, 2A-2F Battery 16a, 16b Output terminal 23 Voltage discriminating means 24 Control means R Voltage dividing resistor

Claims (3)

[Claims] 1. A 1st battery for connecting 2N (N is an integer) batteries in series to be used as a power supply voltage on a load side and detecting a voltage of １ ／ of a power supply voltage applied to the load side. And voltage detecting means for detecting an intermediate voltage of the power supply voltage derived from the N battery terminals connected in series, and whether the first and second detected voltages are substantially equal to each other. And a control unit that is controlled by a determination output when the first and second detection voltages are not substantially equal to each other. 2. The circuit according to claim 1, wherein said control means comprises a buzzer, a display, and a switch controller. 3. The erroneous battery detection circuit according to claim 1, wherein the switch controller is a normally-on type relay and a power switch controlled by the relay.