JPH0715887A - Charging changeover circuit device - Google Patents

Abstract

PURPOSE:To eliminate the need for a changeover switch, to simplify circuit constitution and to reduce manufacturing cost by changing over the on-off of the operation of a charging control circuit in response to the mounting or non-mounting of a battery power supply for charging. CONSTITUTION:When a battery power supply 23 for charging is installed, the positive electrode 24 of the power supply 23 is connected to a positive-electrode side terminal 9 for charging, and a negative electrode 25 is connected to a first negative-electrode side terminal 21 for charging and a second negative- electrode side terminal 22 for charging. Consequently, the ground side of a charging control circuit 20 and the ground side of a rectifier circuit 4 are bonded by the negative electrode 25 in broad width of the power supply 23, thus operating the charging control circuit 20, then starting charging to a battery 26 for the mounted power supply 23. When the power supply 23 is removed, on the other hand, the operation of the charging control circuit 20 is stopped. Accordingly, a changeover switch can be omitted, thus simplifying circuit constitution, then reducing manufacturing cost.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a charge switching circuit device for charging a charging battery.

[0002]

2. Description of the Related Art FIG. 2 is a circuit diagram showing a configuration of a conventional charge switching circuit device. In the figure, 1 and 2 are AC 100
V commercial power supply terminal, 3 is a transformer for dropping AC 100V to a lower predetermined AC voltage, 4 is a rectifier circuit for converting AC to DC, and 5 is a charging battery not shown Is a changeover switch that can be mechanically changed by, and 6 is an external output terminal for supplying the DC output of the rectifier circuit 4 to the outside.

Reference numeral 7 is a constant current circuit for making the charging current constant when charging the charging battery connected to the charging positive side terminal 9 and the charging negative side terminal 10, and 8 controls the constant current circuit 7. It is a voltage detection circuit for doing so.

Next, the operation will be described. The commercial power of AC 100V supplied from the commercial power supply terminals 1 and 2 is
It is converted into a low AC voltage by the transformer 3 and further converted into DC by the rectifier circuit 4. When the charging battery is not attached, the movable contact 5a of the changeover switch 5 is connected to the fixed contact 5b, and the DC power converted by the rectifier circuit 4 can be taken out from the external output terminal 6. Further, when the charging battery is mounted, the movable contact 5a of the changeover switch 5 is switched to the fixed contact 5c. As a result, the output of the rectifier circuit 4 is supplied to the constant current circuit 7 and the voltage detection circuit 8. Then, the voltage detection circuit 8 detects the terminal voltage of the charging positive-side terminal 9, that is, the terminal voltage of the installed charging battery, and the constant current circuit 7 changes the charging current to a value corresponding to the detected terminal voltage. Then, the charging battery connected to the charging positive electrode side terminal 9 and the charging negative electrode side terminal 10 is charged.

[0005]

Since the conventional charge switching circuit device is configured as described above, the changeover switch is mechanically switched by the charging battery installed, and functions as a normal DC power supply device. However, since it has a configuration that functions as a charging device, there is a problem that a changeover switch is required and the circuit configuration becomes complicated.

The present invention has been made to solve the above problems, and an object of the present invention is to obtain a charge switching circuit device which can simplify the circuit structure and reduce the manufacturing cost.

[0007]

A charge switching circuit device according to the present invention includes a rectifier circuit for converting an AC power supply into a DC power supply,
An external output terminal for supplying the output of the rectifier circuit to the outside, a charge control circuit for performing control for charging the charging battery by the output of the rectifier circuit, and an output of the charge control circuit for charging A charging positive electrode side terminal supplied to the positive electrode of the battery, a first charging negative electrode side terminal for connecting the negative electrode of the charging battery and the ground side of the rectifier circuit, a negative electrode of the charging battery and the It is provided with a second charging negative electrode side terminal for connecting to the ground side of the charging control circuit.

[0008]

The charge switching circuit device according to the present invention separates the ground side of the rectifier circuit from the ground side of the charge control circuit,
A first charging negative electrode side terminal connected to the ground side of the rectifier circuit and a second charging negative electrode side terminal connected to the ground side of the charge control circuit were respectively provided, and a charging battery was installed. Only when the charge control circuit operates to charge the charging battery connected to the charging positive side terminal, the first charging negative side terminal, and the second charging negative side terminal, a changeover switch. Can be omitted, and the circuit configuration can be simplified and the manufacturing cost can be reduced.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a circuit diagram showing the configuration of the charge switching circuit device of this embodiment. In FIG. 1, parts that are the same as or correspond to those in FIG. 2 are assigned the same reference numerals and explanations thereof are omitted. In the figure, 20 is a charge control circuit including a constant current circuit 7 and a voltage detection circuit 8, 21 is a first charging negative electrode side terminal connected to the ground side of the rectifier circuit 4, and 22 is a charge control circuit 20. It is a second charging negative electrode side terminal connected to the ground side. Reference numeral 23 denotes a charging battery power source to be mounted, which includes a positive electrode 24 and a wide negative electrode 25. Positive electrode 2
4 is a battery 26 built in the charging battery power source 23
Of the battery 26, and the negative electrode 25 is connected to the battery negative electrode terminal 26 b of the battery 26. When the charging battery power source 23 is attached,
The positive electrode 24 of the charging battery power source 23 is connected to the charging positive electrode side terminal 9, and the negative electrode 25 is the first charging negative electrode side end 2.
It is connected to the first and second charging negative electrode side ends 22.

Next, the operation will be described. When the charging battery power supply 23 is not installed, the ground side of the rectifier circuit 4 and the ground side of the charge control circuit 20 are not connected, and thus the charge control circuit 20 does not operate. On the other hand, since the positive side and the ground side of the rectifier circuit 4 are connected to the external output terminal 6, the DC output of the rectifier circuit 4 can be extracted from the external output terminal 6 to the outside.

When the charging battery power source 23 is installed,
The positive electrode 24 of the charging battery power source 23 is connected to the charging positive electrode side terminal 9, and the negative electrode 25 is the first charging negative electrode side end 2.
Since the first and second charging negative electrode side ends 22 are connected,
The ground side of the charging control circuit 20 and the ground side of the rectifier circuit 4 are connected by the wide negative electrode 25 of the charging battery power supply 23, and the charging battery power supply 23 operated and mounted by the charging control circuit 20 operates. The charging of the battery 26 is started.

As described above, in this embodiment, the charging control circuit 20 depends on whether the charging battery power source 23 is attached or not.
When the charging battery power supply 23 is mounted by switching the operation of ON / OFF, the wide negative electrode 25 of the charging battery power supply 23 and the first
End 21 for charging negative electrode and end 22 for second negative electrode for charging
Are connected to operate the charging control circuit 20 to charge the battery 26 of the mounted charging battery power source 23. Further, when the charging battery power source 23 is removed from this state, the operation of the charging control circuit 20 is stopped.

[0013]

As described above, according to the present invention, since the operation of the charging control circuit is switched on / off depending on whether or not the charging battery power source is mounted, the changeover switch is not required, and the circuit configuration is eliminated. Is simplified and the manufacturing cost can be reduced.

[Brief description of drawings]

FIG. 1 is a circuit diagram showing a charge switching circuit device according to an embodiment of the present invention.

FIG. 2 is a circuit diagram showing a conventional charge switching circuit device.

[Explanation of symbols]

 4 Rectifier Circuit 6 External Output Terminal 20 Charging Control Circuit 21 First Charging Negative Electrode Side Terminal 22 Second Charging Negative Side Terminal 24 Positive Electrode 25 Negative Electrode 26 Battery (Charging Battery)

Claims (1)

[Claims] 1. A rectifier circuit for converting an AC power supply into a DC power supply, an external output terminal for supplying the output of the rectifier circuit to the outside, and a control for charging a charging battery by the output of the rectifier circuit. For connecting the positive electrode terminal for charging for supplying the output of the charging control circuit to the positive electrode of the charging battery, the negative electrode of the charging battery, and the ground side of the rectifying circuit. 1. A charging switching circuit device comprising: a charging negative side terminal; and a second charging negative side terminal for connecting the negative side of the charging battery and the ground side of the charging control circuit.