JPH0543086U - Power supply circuit with defective battery identification - Google Patents

Abstract

(57) [Abstract] [Purpose] Involved in a power supply circuit with a defective battery discrimination, and particularly for a power supply circuit with a defective battery discrimination such as a measuring instrument, a radio, a tape recorder, or other industrial equipment products or home appliances that use batteries. Regarding improvement. [Structure] In an electric device in which a plurality of batteries are connected in parallel to form a power supply circuit, a current detector that detects the discharge current of the batteries in each circuit in parallel, and a current value from the current detector in each circuit A comparator for comparing, a judging device for judging a battery having a deteriorated discharge current according to the value of the compared current value, and a switch for disconnecting the deteriorated battery from the parallel circuit according to a command value from the judging device. [Effect] Even if a defective battery is mixed, no power loss occurs, and when the battery is used up, the used battery can be replaced without fail. This facilitates maintenance of the battery and saves resources through correct management. Furthermore, even if the polarity of the battery is wrong and the + and-directions are connected, the switch operates and the danger of the battery rupturing due to the reverse connection because it is disconnected from the power supply circuit can be prevented.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a power supply circuit with a defective battery discrimination, and more particularly, to an improvement of a power supply circuit with a defective battery discrimination such as a measuring instrument, an industrial equipment product using a battery of a radio, a tape recorder, or an electric home appliance.

[0002]

[Prior Art]

 Conventionally, when a battery is used as a power source for equipment, series connection is used to obtain a high voltage, and parallel connection is used to obtain a large capacity. Rarely, it is used in a combination of series and parallel. When the battery of this equipment is completely discharged (when the battery runs out), the user either replaces the battery with a new one or, in the case of a rechargeable battery, recharges it and reuses it. At this time, there are some things that display the amount of battery consumption and let you know when to replace it.

[0003]

[Problems to be solved by the device]

 However, in order to attach and remove a plurality of batteries, old and new batteries may be mixed, or batteries with different charging states may be combined, which causes problems. If batteries with different amounts of stored electricity (energy) are connected, the batteries not only release electric power to the electrical loads (motors, lamps, etc.) inherent in the equipment, but also cause a charging action between the batteries, resulting in power loss. Is known to be. In particular, in the case of a series circuit, it is possible to make a distinction because the voltage drops, but when a parallel circuit is used, it is difficult to make a distinction even if the capacitance is reduced, unlike the series circuit. It The present invention focuses on the above problems, and relates to a power supply circuit with defective battery discrimination, and particularly to a power supply circuit with defective battery discrimination for measuring instruments, radios, tape recorders, and other industrial equipment products that use batteries, or home appliances. The purpose is to improve.

[0004]

Means for Solving the Problems In order to achieve the above object, according to a first aspect of the present invention, in an electric device in which a plurality of batteries are connected in a parallel circuit to form a power supply circuit, A current detector that detects the discharge current of the battery in each circuit, a comparator that compares the current value from the current detector in each circuit, and a battery whose discharge current has deteriorated is determined according to the value of the compared current value. And a switch that disconnects the deteriorated battery from the parallel circuit according to the command value from the determiner.

In a second invention, in an electric device in which a plurality of batteries are connected in parallel to form a power supply circuit, a current detector provided in the parallel battery circuit detects the flow of current and The dischargeable time is extended by detecting the battery whose discharge capacity has decreased by comparing the current values of the above, and by intermittently switching the battery in the battery circuit with a switch to reduce the load on other batteries.

[0006]

[Action]

 According to the above configuration, it is normal if each battery generates a positive current when current is generated, and no current is generated, or a negative current is generated. If there is a battery circuit in place, it can be determined that the battery has been completely discharged (battery has run out). If this defective battery is connected as it is, it will cause power loss, so it is immediately separated from the power supply circuit by the switching circuit. At this time, if the circuit is connected to a display circuit and displayed, the capacity can be reduced and a defective battery can be easily identified.

[0007]

【Example】

 An embodiment of a power supply circuit with defective battery discrimination according to the present invention will be described below in detail with reference to the drawings. FIG. 1 is an overall configuration layout diagram showing an outline of a power supply circuit with defective battery discrimination according to one embodiment of the present invention. In FIG. 1, a plurality of batteries 1a, 1b, 1c are connected by parallel circuits 2a, 2b, 2c and connected to an electric device (not shown) by wiring 3a, 3b to form a power supply circuit. The current detectors 4a, 4b, 4c that detect the discharge current of the battery of each circuit in parallel, the comparator 5 that compares the current values from the current detectors 4a, 4b, 4c of each circuit, and the It comprises a judging device 6 for judging a battery having a deteriorated discharge current according to a value, and switches 7a, 7b, 7c for disconnecting a deteriorated battery from a parallel circuit according to a command value from the judging device 6. Further, the judgment circuit 6 is connected to a display device 8 for displaying a defective battery. In the above, the number of batteries may be connected regardless of the number, or a series / parallel circuit may be used. The switch may be a relay or a semiconductor (transistor etc.), and the display device may be an LED with a battery symbol or a digital display.

Next, the operation of the above structure will be described. Assuming that the batteries 1a, 1b, 1c are in exactly the same state, the currents A, B, C flowing in the circuits 2a, 2b, 2c are currents A = B = C regardless of the loads. However, if the battery 1a is a defective battery, the currents A, B, and C flowing in the circuits 2a, 2b, and 2c are currents A <B = C, and there is a difference between the current detectors 4b and 4c in 4a. Occurs and can be judged by the judging device 6. Therefore, the battery 1a is found to be a defective battery, and the switch 7a for disconnecting the deteriorated battery 1a from the parallel circuit is activated by the command value from the determiner 6.

However, in reality, the conditions are not exactly the same due to variations in quality, differences in storage conditions, etc., and in many cases A ≠ B ≠ C. Even at this time, a defective battery has a smaller current value than a good battery, so if the individual current values of all connected batteries are compared, the smaller the current value, the worse the degree of failure. Absent. Therefore, when the difference between the current values exceeds a predetermined value, it may be judged as defective. This predetermined value may be obtained from the relationship with the characteristics of the battery and the size of the load. The circuit of this defective battery is separated by the switches 7a, 7b, 7c and is displayed on the display 8 so that it can be easily determined which battery should be replaced or charged.

[0010]

[Effect of the device]

 As described above, according to the present invention, even if a defective battery is mixed, no power loss occurs, and when the battery is used up, the used battery can be replaced without fail. This facilitates maintenance of the battery and saves resources through correct management. In addition, even if the polarity of the battery is wrong and the + and-directions are connected, the switch operates, and it is possible to prevent the risk of the battery rupturing due to reverse connection because it disconnects from the power supply circuit. Be done.

[Brief description of drawings]

FIG. 1 is an overall configuration layout diagram showing an outline of a power supply circuit with defective battery determination according to an embodiment of the present invention.

[Explanation of symbols]

1a, 1b, 1c Battery 2a, 2b, 2c Parallel circuit 3a, 3b Wiring 4a, 4b, 4c Current detector 5 Comparator 7a, 7b, 7
c switch 6 judger 8
Display device

Claims (2)

[Scope of utility model registration request] 1. In an electric device in which a plurality of batteries are connected in a parallel circuit to form a power supply circuit, a current detector for detecting a discharge current of a battery in each parallel circuit and a current detector for each circuit are provided. A comparator that compares current values, and a determiner that determines a battery with deteriorated discharge current according to the value of the compared current value,
A power supply circuit with a defective battery discrimination, comprising: a switch for disconnecting a deteriorated battery from a parallel circuit according to a command value from a judgment device. 2. In an electric device in which a plurality of batteries are connected in a parallel circuit to form a power supply circuit, a current detector arranged in the parallel battery circuit detects a current flow and detects the current value of each circuit. Compared with the defective battery detection, which detects a battery whose discharge capacity has decreased, and intermittently switches the battery of the battery circuit to reduce the load on other batteries to extend the dischargeable time. Power supply circuit.