KR20020016401A - Charging circuit for double battery at the same time - Google Patents

Abstract

PURPOSE: A charging circuit is provided to enhance a charging efficiency and shorten an entire charging time. CONSTITUTION: A first current controller(111) receives power and supplies a front battery(113) inserted into a front port with a constant current. A first switching element(112) is turned off if the front battery(113) is a full charging mode to cut off the supplying current from the first current controller(111) to the front battery. A second current controller(121) receives power and supplies a rear battery(123) inserted into a rear port with a constant current. A second switching element(122) cuts off the supplying current from the second current controller(121) to the rear battery if the rear battery is a full charging mode or a charging current flows into the rear battery from the first current controller. A third switching element(130) supplies the rear battery with the charging current output from the first current controller if the first switching element is turned off.

Description

Charging circuit for double battery at the same time}

The present invention relates to a two-battery simultaneous charging circuit, and more particularly, to a two-battery simultaneous charging circuit that reduces the charging time by switching the current path to another port when one port becomes full in the simultaneous battery charging mode. It is about.

In general, simultaneous charging in a battery charger refers to a method of simultaneously charging two battery ports, and in the related art, a simultaneous charger uses a method of controlling two ports with a fixed current, respectively.

However, in the case of the conventional simultaneous charging, since the current source of the rear stage is smaller than the front stage, the charging time is long, which causes a problem of decreasing the efficiency of the charger.

FIG. 1 is a block diagram illustrating a two battery simultaneous charging circuit according to the prior art.

Referring to FIG. 1, when the front battery 13 is inserted into the front end of the charger, the current by the supply power is independently controlled by the first current control unit 11 to be a constant current regardless of the rear end and thus the first switching. It is supplied to the front battery 13 through the element 12 to be charged.

On the other hand, when the rear battery 23 is inserted into the rear end of the charger, the current by the power supply is independently controlled by the second current control unit 21 to a constant current irrespective of the front end, so that the second switching element 22 Is supplied to the rear battery 23 through the charge is to be made.

That is, the front and rear stages charge the battery with a constant current controlled by the respective current controllers 12 and 22.

As a result, as described above, since the conventional technology uses a method of controlling two port currents to each fixed current source, power loss is increased, and the charging time is long because the rear current source is smaller than the front end. This is happening.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and its object is to shut down the current source of the rear stage and connect the current source of the front stage to the rear stage when the battery of the front stage becomes full during the simultaneous charging mode. By increasing the charging current of the rear battery to increase the efficiency of the charger and at the same time to provide a two-battery charging circuit that can reduce the overall charging time.

1 is a block diagram showing the configuration of a two battery simultaneous charging circuit according to the prior art;

Figure 2 is a block diagram showing the configuration of two battery simultaneous charging circuit according to the present invention

<Description of Symbols for Main Parts of Drawings>

111: first current controller 112: first switching element

113: front battery 121: second current control unit

122: second switching element 123: rear battery

130: third switching element

According to a feature of the present invention for achieving the above object, the first current control unit for supplying a constant current to the front battery which is supplied to the front end of the charger receiving the power supply, and when the front battery is the full mode A first switching element which is turned off and cuts off the current supplied from the first current controller to the front battery; and a second current controller for supplying a constant current to a rear battery which is supplied with a supply power and is inserted into a rear end of the charger; A second switching element which cuts off the current supplied from the second current controller to the rear battery when the rear battery is in full mode or when charging current is supplied from the first current controller to the rear battery; When the device is off, the battery is turned on so that the charging current output from the first current controller 111 is supplied to the rear battery. It provides a two battery simultaneous charging circuit configured to include a third switching device.

The above objects and various advantages of the present invention will become more apparent from the preferred embodiments of the invention described below with reference to the accompanying drawings by those skilled in the art.

Hereinafter, with reference to the accompanying drawings, preferred embodiments of the present invention will be described in detail.

2 is a block diagram showing the configuration of two battery simultaneous charging circuits according to the present invention.

Referring to FIG. 2, reference numeral 113 denotes a front battery inserted into the front end of the charger, 111 denotes a first current controller for supplying a constant current to the front battery 113 by receiving a power supply. When the front battery 113 is in the full mode, the first current controller 111 cuts off the current supplied to the front battery 113.

In addition, reference numeral 123 denotes a rear battery inserted into the rear end of the charger, 121 denotes a second current controller which receives a supply power and supplies a constant current to the rear battery 123, and 122 denotes the rear battery 113 The second switching element which cuts off the current supplied to the rear battery 123 from the second current controller 121 when the charging mode is supplied to the rear battery 123 from another current source. Indicated by reference numeral 130, the first power supply is turned on when the first switching element 112 is off to allow the charging current output from the first current control unit 111 to be supplied to the rear battery 123. 3 shows a switching element.

Referring to the operation of the present invention having the configuration as described above in detail.

In the above configuration, in the simultaneous charging mode, the current of the second current controller 121 supplied to the rear battery 123 at the rear stage is supplied to the front battery 113 of the front stage. The front battery 113 first enters the full mode because it is smaller and the charging time becomes longer.

First, when the front battery 113 is inserted only at the front end of the charger, the current by the supply power is independently controlled by the first current control unit 111 to be a constant current regardless of the rear end, so that the first switching element 112 Supplied to the front battery 113 is charged.

In addition, when the rear battery 123 is inserted only into the rear end of the charger, the current by the supply power is independently controlled by the second current controller 121 to be a constant current regardless of the front end, so that the second switching element 122 Supplied to the rear battery 123 to perform charging.

On the other hand, when the simultaneous charging mode is performed in which the front battery 113 and the rear battery 123 are inserted to simultaneously charge the front end and the rear end, the output current of the first current controller 111 is the first switching element 112. ) Charges the front battery 113, and the output current of the second current controller 121 charges the rear battery 123 through the second switching element 122. In this case, when the front battery 113 first enters the full mode, the first switching element 112 and the second switching element 122 are turned off, and the third switching element 130 is turned on. . As a result, the output current of the first current controller 111 charges the rear battery 123 through the third switching element 130.

Since the output current of the first current controller 111 is greater than the output current of the second current controller 121, the charging time of the rear battery 123 is shortened.

While the invention has been shown and described in connection with specific embodiments thereof, it is well known in the art that various modifications and changes can be made without departing from the spirit and scope of the invention as indicated by the claims. Anyone who owns it can easily find out.

As described above, the two-battery simultaneous charging circuit according to the present invention cuts off the current source of the rear stage and connects the current source of the front stage to the rear when the battery of the front stage becomes the full mode during the simultaneous charging mode. Increasing the charging current of the battery increases the efficiency of the charger and reduces the overall charging time.

Claims (1)

A first current controller configured to receive a power supply and supply a constant current to a front battery inserted into the front end of the charger; and when the front battery is in a full mode, the first current controller is turned off and supplied from the first current controller to the front battery. A second current controller and a rear battery which is supplied to the rear end of the charger in response to a supply current and a first switching element that cuts off a current, and when the rear battery is in a full mode or from the first current controller A second switching element which cuts off the current supplied from the second current controller to the rear battery when the charging current is supplied to the rear battery, and is turned on when the first switching element is off; And a third switching device configured to supply the charging current output from the first current controller 111 to the rear battery. 2 battery simultaneous charging circuit.