JP3054033U - Charger - Google Patents

Abstract

(57) [Problem] To provide a charger which connects a charging power source to a charging circuit only when a secondary battery is mounted for charging when charging a secondary battery, but does not use a switch for switching. A charger 1 includes a power supply 2, a control unit 3 serving as a charging circuit, a current control circuit 4, charging terminals 1a and 1b, and short-circuit terminals 1c and 1d. 5a and 5b and short-circuit plates 5c and 5d, which are mounted on the charger 1 for charging, the short-circuit plates 5c and 5d are short-circuit terminals 1c.
Touch 1d to charge.

Description

[Detailed description of the invention]

[0001]

[Industrial applications]

 The present invention relates to a configuration of a charger for charging a rechargeable battery.

[0002]

[Prior art]

 3 shows a conventional charger, FIG. 3 (a) is a perspective view showing the configuration, and FIG. 3 (b) is a block diagram of the charger. Description will be made with reference to FIG. 1 is a charger, 1a and 1b are charging terminals, 5 is a secondary battery provided with charging terminals 5a and 5b such as nickel cadmium batteries and lithium ion batteries. When the secondary battery 5 is inserted into the recess of the charger 1, the charging terminals 1a and 5a come into contact, and the charging terminals 1b and 5b come into contact to charge.

Next, a block diagram of FIG. 3B will be described. The charger 1 includes a power supply 2 for charging, a control unit 3 for controlling charging, and a current control circuit 4 for controlling ON / OFF of charging. The control unit 3 forming a charging circuit of the charger 1 includes: A voltage / current is always supplied from the power supply 2 to the current control circuit 4, and the standby state is continued until the secondary battery is mounted. When the secondary battery 5 is mounted, the control unit 3 monitors the voltage of the secondary battery from the charging terminals 1a and 1b, and outputs a charging current signal to the current control circuit 4 if the voltage is lower than the normal voltage. The battery 5 is charged. When a full charge is detected in the voltage monitoring of the control unit 3, the charging current signal output to the current control circuit 4 is turned off, and the current control circuit 4 is turned off to stop charging. Does not release the operating state.

[0004] Other conventional examples of the prior art include a perspective view showing the structure of FIG. 4A and a block diagram of FIG. 4B. FIGS. 4 (a) and 4 (b) are different from FIGS. 3 (a) and 3 (b) in that the start switch 6 is attached to the recess of the charger, and the basic operation is the same as in FIG. Will be described only. When the secondary battery 5 is mounted in the recess of the charger 1, the start switch 6 in the block diagram of FIG. 4B is pressed on the bottom surface of the secondary battery 5, and the start switch 6 in FIG. When the power is turned on, the power supply 2 is connected to the control unit 3 and the current control circuit 4 to be in a chargeable state. The charge is started by monitoring the voltage of the secondary battery 5 as described for the charge in FIG. When the secondary battery 5 is removed from the charger 1 after charging is completed, the start switch 6 is turned off, and the charging circuit formed by the control unit 3 and the current control circuit 4 is cut off from the power supply 2.

[0005]

[Problems to be solved by the invention]

 In the charging according to the prior art, in the case of FIG. 3, the power is always supplied to the charging circuit and the power consumption continues even when the secondary battery 5 is not mounted on the charger 1 for charging. There is also a concern about accidents due to failure of the components that make up the system. In FIG. 4, if the battery is not in the charged state, the power supply 2, the control unit 3 of the charging circuit, and the current control circuit 4 are cut off by the start switch 6, so there is no concern as shown in FIG. The corresponding switch must be installed, which increases costs. An object of the present invention is to solve such a problem and to provide a low-cost charger having an extremely simple structure and unnecessary power consumption.

[0006]

[Means for Solving the Problems]

 A charger equipped with a charging circuit for charging a secondary battery is provided with a charging terminal connected to a charging terminal of the secondary battery and a short-circuit terminal for connecting a power supply to the charging circuit. When the secondary battery is inserted, the short-circuit terminals are short-circuited, and the charging circuit is connected to a power supply to charge the battery.

[0007] A charger that is charged when a secondary battery including a charging terminal connected to a charging terminal of the charger and a short-circuit plate for short-circuiting between short-circuit terminals of the charger is inserted for charging. You.

[0008]

[Action]

 When a rechargeable battery equipped with a charging terminal and a short-circuit plate is installed in the charger, the power in the charger is short-circuited to the short-circuit terminal by the short-circuit plate and power is supplied to the charging circuit consisting of the control unit and the current control circuit. . In this state, the voltage of the mounted secondary battery is read from the charging terminal, and the control section determines whether or not charging is necessary. When it determines that charging is necessary, the control section outputs a charge start signal to the current control circuit and outputs the signal to the current control circuit. Is turned on, and charging current flows to the charging terminal to charge the secondary battery. When the control unit constantly monitors the voltage of the charging terminal and detects that the battery is fully charged, the current control circuit is turned off and charging is stopped. When the secondary battery is removed, the short-circuit terminal is turned off, and the control unit and the charging circuit of the current control circuit are turned off.

[0009]

[Embodiment of the invention]

 FIG. 1 is a diagram showing an embodiment of a battery charger for a secondary battery according to the present invention, wherein (a) is a perspective view of a secondary battery and a charger, and (b) is a block diagram of a secondary battery and a charger. is there. 1 is a charger, 1a and 1b are charging terminals, 1c and 1d are short-circuiting terminals, and 2 is a power supply, which generates voltage or current for charging from an AC power supply by DC or pulse. Reference numeral 3 denotes a control unit, 4 denotes a current control circuit, 5 denotes a secondary battery, 5a and 5b denote charging terminals, 5c and 5d denote short-circuit plates.

Description will be made with reference to FIG. A secondary battery 5 to be charged and used, such as a nickel cadmium battery or a lithium ion battery used for a portable electronic device or the like, is mounted in a charging recess of the charger 1. Therefore, 1a and 5a and 1b and 5b are connected at the charging terminals of the charger 1 and the secondary battery 5, respectively, and the short-circuiting plates 5c and 5d of the secondary battery 5 are in contact with the short-circuiting terminals 1c and 1d of the charger 1. By short-circuiting the short-circuit terminals 1c and 1d, the attachment / detachment of the secondary battery 5 plays the role of the start switch 6 according to the conventional example.

The power supply 2 shown in the block diagram of FIG. 1B is configured such that when the secondary battery 5 is mounted on the charger 1 for charging, the short-circuit terminals 1c and 1d are short-circuited by the short-circuit plates 5c and 5d, and the control unit 3 And the current control circuit 4 is connected to the charging circuit. In this state, the control unit 3 detects the voltage of the secondary battery from the charging terminals 1a and 1b, measures whether the voltage needs to be charged, and turns on the current control circuit 4 if necessary to turn on the current from the charging terminals 1a and 1b. Apply charging current to the secondary battery. When the voltage indicates a full charge from the charged state, a charge stop signal is output to the current control circuit 4 to stop charging. During this charging period, it is usually possible to determine whether charging is being performed or charging is completed by a RED display (not shown). When the RED display during charging disappears, the secondary battery 5 is removed from the charger 1 and the power source 2 and the control unit 3 And the current control circuit 4 is disconnected.

FIG. 2 is a diagram showing another embodiment of the present invention, in which (a) is a perspective view of a secondary battery and a charger, and (b) is a block diagram of a secondary battery and a charger. is there. The difference between FIG. 2 and FIG. 1 is that the charging terminal 5a has a horizontally long shape without the short-circuit plates 5c and 5d, and also has a short-circuit plate function. The charger 1 has three terminals of charging terminals 1a and 1b and a short-circuit terminal 1c. When the secondary battery 5 is mounted on the charger 1, the charging terminal 1a and the short-circuit terminal 1c become horizontally long. Short-circuited by the charging terminal 5a having a shape, the control unit 3 of the charging circuit, the current control circuit 4, and the power supply 2 are connected and charged. The voltage monitoring in FIG. 2 detects the difference (V1−V2) between V1 of the charging terminal voltage 1a and V2 of 1b. Except for the three-terminal circuit, the configuration is the same as that of FIG.

[0013]

[Effect of the invention]

 The power supply for charging the charger and the control for charging the battery as in the present invention can be applied to the battery that always supplies power to the charging circuit as in the battery charger of the prior art and the charger equipped with a switch to turn on and off the power. The power supply path of the charging circuit consisting of the power supply and the current control circuit is cut off and a short-circuit terminal is provided between the power supply paths, and a short-circuit plate for short-circuiting the charging terminal and the short-circuiting terminal is provided for the secondary battery to be charged. Since the power supply is connected to the charging circuit only when the rechargeable battery is installed for charging, the power supply is turned off when the rechargeable battery is removed, so that there is no unexpected accident or power saving. In addition, since a start switch is not required, the cost can be reduced.

[Brief description of the drawings]

FIG. 1 is a diagram showing one embodiment of the present invention;
It is a perspective view of a secondary battery and a charger, and (b) is a block diagram of a secondary battery and a charger.

FIGS. 2A and 2B are views showing another embodiment of the present invention, wherein FIG. 2A is a perspective view of a secondary battery and a charger, and FIG. 2B is a block diagram of the secondary battery and a charger.

FIG. 3 is a perspective view (a) and a block diagram (b) of a conventional charger.

FIG. 4 is a perspective view (a) and a block diagram (b) of another conventional charger.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Charger 1a, 1b Charging terminal (charger side) 1c, 1d Short-circuit terminal 2 Power supply 3 Control part 4 Current control circuit 5 Secondary battery 5a, 5b Charging terminal (secondary battery side) 5c, 5d Short-circuit plate 6 Start switch

Claims (2)

[Utility model registration claims] A charger provided with a charging circuit for charging a secondary battery is provided with a charging terminal connected to a charging terminal of the secondary battery and a short-circuit terminal for connecting a power supply to the charging circuit. When the secondary battery is inserted into the charger, the short-circuit terminals are short-circuited, and the charging circuit is connected to a power supply to perform charging. 2. A charging device comprising: a charging terminal connected to a charging terminal of a charger; and a short-circuit plate for short-circuiting between short-circuit terminals of the charger. The battery charger according to claim 1, wherein: