JPH037025A - Display system of charger - Google Patents

Abstract

PURPOSE:To display whether a secondary battery is good or bad by providing a terminal voltage detecting circuit and a temperature detecting circuit both for charging and fetching the information of those detecting circuits in a microprocessor and performing abnormal voltage and abnormal temperature rise judgments. CONSTITUTION:When a secondary battery to be charged is connected to a charging terminal, the analog value of a secondary battery voltage is converted to a digital value by an A/D converter 16 to be read in a microprocessor 14. When V2<V<V1, where V is a measured voltage value and V1 and V2 are prescribed voltage values, the lighting condition of an LED 17 is judged to be a slow flashing and when V<=V2, the connected secondary battery is judged to be abnormal (in a short-circuited condition) to make the lighting condition of the LED 17 a fast flashing. When the temperature detecting circuit 15 detects an abnormal temperature and the microprocessor 14 judges an abnormality during charging, the LEB 17 is made a slow flashing and a luminance half the one in lighting.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for displaying a charger that can be applied to all devices that charge batteries.

[Conventional technology]

FIG. 5 shows the configuration of a conventional charger 1. As shown in FIG.

This conventional example has a built-in timer circuit that adds up the elapsed time of the secondary battery 2, lights up the LED 3 at the start of charging, and sets the timer circuit to turn on the LED 3 after a predetermined elapsed time.
Turn off ED3.

This type of display method for chargers is described in Motorola, Cellular Portable Telephone, User's Manual, pages 34 and 35 (Cellular Port
table Telephone User's
manualP, 34-35: 1984 Motor
ola, Inc. 68pH15EO3-0).

[Problem to be solved by the invention]

The above-mentioned conventional technology has a problem in that the device itself cannot determine whether the battery is defective or non-defective because it can only display charging in progress and charging completion.

The purpose of the present invention is to improve these problems and provide an indication that allows one to judge for himself whether a product is defective or non-defective.

[Means to solve the problem]

In order to achieve the above objects, the present invention provides a terminal voltage detection circuit and a temperature detection circuit for charging, and imports information from these detection circuits into a microprocessor to determine abnormal voltage and abnormal temperature rise. This controls the charging power source.

[Effect]

The logic level of the output signal of the temperature detection circuit is 1/I II or 110 to the microprocessor that controls the entire charger.
Logic level of the signal II and the output signal of the voltage detection circuit''
By supplying either 1'' or ○'', the microprocessor uses an appropriate algorithm to display the presence or absence of an abnormality in the secondary battery attached to the charger and the state of charge in multiple stages.

〔Example〕

An embodiment of the present invention will be described below.

FIG. 1 shows the configuration of an embodiment of the present invention and the state transition of one display unit as follows.

Fig. 2 shows an internal block diagram, and Fig. 4 shows a schematic flowchart of microprocessor control.6 In Fig. 2, when the secondary battery to be charged is connected to the charging terminal, the A/D conversion circuit 16 Then, the analog value of the voltage value of the secondary battery is converted into a digital value and read into the microprocessor 14.

The microprocessor 16 compares this value with a predetermined value, determines the initial state of the connected secondary battery, and changes the lighting state of the LED 17.

That is, when the secondary battery is completely discharged and the measured voltage value V is V<V<vl with respect to the specified voltage values Vu and V, the lighting state of the LED 17 is changed to slow blinking. , or in the case of V:ii; V□, the connected secondary battery is abnormal (
It is determined that the LED 17 is in a short-circuit state, and the lighting state of the LED 17 is set to blink rapidly.

Normally, when the secondary battery is connected, the microprocessor 14 controls the switch circuit 12 (energized state = OFF).
N) Start charging the secondary battery.

At this time, after a predetermined period of time has elapsed, the timer starts counting in order to stop charging. During charging, monitor the voltage of the charging terminal with A/
This is performed by the D conversion circuit 16, and when -ΔV is detected in the graph of elapsed time versus voltage value shown in FIG. 3, it is determined that charging is complete, and energization to the charging terminal is terminated. During this charging period, the temperature detection circuit 15 shown in FIG. 2 detects an abnormal temperature, and if the microprocessor 14 determines that the temperature is abnormal, the second
The LED 17 shown in the figure is in a slow blinking state and a half-brightness state when lit. If the charging terminal voltage value is an abnormal voltage value, the lamp blinks quickly and turns on at half brightness. The voltage comparison circuit 13 shown in FIG. 2 is for detecting whether or not a secondary battery is connected to the charging terminal. Further, the LED brightness control circuit 18 shown in FIG. 2 is for controlling the current of the IED 17 under the control of the microprocessor 14.

〔Effect of the invention〕

The present invention has the effect of providing safety and reliability to users by adding new functions to a rechargeable battery charger.

[Brief explanation of drawings]

FIG. 1 is a perspective view of an embodiment of the present invention, FIG. 2 is a block diagram of the embodiment of the present invention, FIG. 3 is an explanatory diagram for detecting the end of charging in the embodiment of the present invention, and FIG. The figure shows an outline of the operation flowchart of this embodiment, and FIG. 5 is a perspective view of a conventional charger. 11... Constant voltage circuit. 12... Switch circuit, 13... Voltage comparison circuit, 14... Microprocessor. 15...Temperature detection circuit, 16...A/D conversion circuit. 17...LED. 18...LED brightness control circuit. 2-112; power failure A request 3-LJI) Figure //--Constant V Edoji 12 - Sui 9,000 days series, 13-1 floating comparison circulation l+---Migro 7qr: J set length lkaichionshakobook/, g-A okihenkan 8ro, ! Goo LED 1B --- L7: D Kiwatari @ Misaki Utsugai

Claims (1)

[Claims] 1. A charger that charges a secondary battery is equipped with a circuit that detects the state of the secondary battery to be charged, and changes the state of the display device based on information from the detection circuit to detect abnormalities in the secondary battery. A display method for a charger characterized by displaying the presence or absence of a charger and the state of charge in multiple stages by blinking a display element.