JPS61227643A - Monitor for battery - 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] Industrial Application Fields The present invention displays a charging state while a battery is being charged, and displays an alarm when a voltage drop or a terminal becomes disconnected. The present invention relates to a battery monitoring device.

[Conventional technology] Batteries that serve as emergency backup power sources for emergency lights that are turned on in the event of a power outage, evacuation guide lights in the event of an accident, and other electrical equipment must be ready to operate immediately at any time, so such batteries are used. The monitor used to monitor the battery was equipped with a device that would alert you if there was an abnormal drop in battery voltage or if the battery terminal became disconnected. Further, while the battery is being charged, the charging device is provided with an indicator light lighting circuit to indicate that the battery is in the charging state.

[Problems to be Solved by the Invention] The conventional battery monitoring device as described above only warns of a drop in battery voltage or disconnection of a terminal, but cannot notify the state of charge of the battery. There wasn't. In addition, the charging status display circuit simply displays the charging status, and if you try to issue an alarm such as a drop in battery voltage or a disconnected terminal, the number of indicator lights will increase and the circuit configuration will become complicated. There was a point.

In order to solve these problems, the present invention provides a battery monitoring device that can issue a warning such as a battery voltage drop and display the state of charge with a single indicator light.

[Means for Solving the Problems] The present invention provides a charging status display circuit having an indicator light that displays the battery charging status, a battery voltage detection circuit that detects an abnormal drop in battery voltage, and A battery monitoring device is constituted by a first transistor that closes the status display circuit and a second transistor that turns off the indicator light when an abnormality occurs due to a drop in battery voltage.

[Operation] During battery charging, the first transistor is turned on to close the charging status display circuit, thereby lighting up the indicator light to display the charging status. In addition, the /< battery voltage detection circuit detects abnormalities such as a drop in battery voltage or the voltage output of the battery becomes zero due to disconnection of the terminal, and outputs an output signal. The second transistor is turned on, turning off the first transistor and opening the charging state display circuit. As a result, the indicator lamp that has been lit up until now turns off, and this turning off serves as a warning that a battery output failure condition has occurred.

[Embodiments] Examples of the present invention will be described below with reference to the drawings. In the figure, 1 is an AO-Do conversion power supply unit, B is a battery, and 2 is a load connected in parallel to battery B via a switch S.

3 in the dotted line frame is a charging status display circuit, which is made up of a series-connected light emitting diode and a resistor R2, and the charging status display circuit 6 is connected to the resistor R1 connected between the power supply section 1 and the negative terminal of the battery B. , are connected in parallel through the collector-emitter of the first transistor Tri. When this first transistor Trl is turned on, the charging state display circuit 3 is closed, the light emitting diode 2 emits light, and the first transistor Try
When turned off, the charge status display circuit 3 is opened and the light emitted from the light emitting diode I is turned off. R3 is the first transistor T
This is the base resistance of ri.

4 is a battery voltage detection circuit which outputs an output signal when the output voltage of battery B falls below a predetermined voltage; for example, using 10 circuits each having an OF amplifier A, OP amplifier A compares it with the reference voltage, and the OP signal is activated when the battery becomes unable to output, such as when the battery voltage drops below a predetermined voltage or when the battery terminal is disconnected and the voltage output becomes zero.
The configuration is such that the amplifier A outputs a signal.

Note that this does not have to be the ten circuits described above, but any circuit that can output a state in which the battery voltage is equal to or lower than a predetermined voltage may be used.

Tr2 is connected to the output of the battery voltage detection circuit 4, and its collector and emitter are connected between the base and emitter of the first transistor Trl. When this second transistor Tr2 is turned on, the first transistor Tr2 is turned on.
1 is turned off by short-circuiting between its base and emitter, thereby opening the charging state display circuit 3 and extinguishing the light on the light emitting diode that was emitting light.

The apparatus of the present invention is constructed as described above, and has an A C-
The output current of the DO conversion power supply unit 1 is supplied to the load 2 and charges the battery B. During this charging, the first transistor Tri is turned on and the current flows through the resistor R1. There is. This first transistor Tri
When turned on, the light emitting diode of the charging status display circuit 3 is turned on.
The parallel circuit of resistor R2 and resistor R1 is closed, and the voltage across resistor R1 causes the light emitting diode to emit light, causing battery B
Lights up to indicate that the battery is being charged.

Further, when an abnormality occurs such as the voltage of battery B decreasing or the voltage output becoming zero, the battery voltage detection circuit 4 detects this and outputs an output signal, which turns on the second transistor Tr2 and turns on the first transistor. The base and emitter of the transistor Tri are short-circuited, so that the transistor Tri is turned off, the charging state display circuit 3 is opened, and the light emitting diode is turned off. In this way, the fact that the light emitted by the light emitting diode that has been emitting light is turned off is an alarm indicating that the battery output has become defective.

[Effects of the Invention] As described above, the battery monitor device of the present invention includes a charging status display circuit that lights up an indicator light to indicate the charging status while the battery is being charged, and prevents the battery from dropping due to a drop in battery voltage or disconnection of the terminal. When an abnormality occurs, such as when the voltage output becomes zero, we have installed a battery voltage detection circuit that detects this and turns off the indicator light, so a single indicator light can indicate that the battery is being charged and that the battery voltage is dropping. , it is possible to reliably display an alarm for the occurrence of an output failure state, and moreover, it can be configured at low cost.

[Brief explanation of the drawing]

The drawing is a circuit diagram of an embodiment of the present invention. B: Battery. 3: Charging status display circuit.・4: Battery voltage detection circuit LICD: Indicator light. Trl: First transistor? r2: Second transistor patent applicant Toshiba Electric Materials Co., Ltd. Agent Patent Attorney Oka 1) Kikuji procedural amendment ml
(Method) L Indication of the case Patent Application No. 68042 of 1985 2 Name of the invention Battery monitoring device 3 Person making the amendment Relationship to the case Patent applicant Toshiba, 1-4-28 Mita, Minato-ku, Tokyo (375) Denzai Co., Ltd. Representative: Tsuruo Tsutomumoto Agent: 704 MF Shinbashi, 4-24-3 Shinbashi, Minato-ku, Tokyo 105 %'-”W
5. Date of amendment order June 25, 1985 (shipment date) 6. Full text of the specification to be amended 7. Engraving of the specification of the contents of the amendment (no change in content) Procedures Amendment II (voluntary) 1985 July 17th, 2017, Commissioner of the Japan Patent Office, Academic Award Road rSII1 1, Indication of the case, 1985 Patent Application No. 68042, 2, Name of the invention, Battery monitoring device 3, Person making the amendment, Relationship with the case, Patent applicant: Minato-ku, Tokyo Mita 1-4-28 (375) Toshiba mu Corporation Representative Tsutomu 4, Agent (105) 4-24-3-5 Shinbashi, Minato-ku, Tokyo Drawing subject to amendment 6, Contents of amendment

Claims (1)

[Claims] a charging state display circuit having an indicator light, a battery voltage detection circuit detecting a decrease in battery voltage, a first transistor closing the charging state display circuit and lighting the indicator light during charging of the battery, and the battery. A battery monitoring device comprising: a second transistor driven by the output signal of the voltage detection circuit to open the charging state display circuit and turn off the indicator light.