JPH01198232A - Charging circuit for charging type cleaner - Google Patents

Abstract

PURPOSE:To charge batteries efficiently, and to reduce the rating of parts used for a charging circuit by continuously charging the batteries in a main body and spare batteries alternately. CONSTITUTION:A charging circuit 1 mainly charges a body side battery 4 by large currents first. When reaching to voltage corresponding to approximately 90% of the battery capacity of the body side battery 4 by the main charging is detected, the charging circuit 1 mainly charges a spare battery 5 until the voltage of the spare battery 5 reaches voltage corresponding to approximately 90% of the battery capacity of the battery 5. The charging circuit 1 supplementarily charges the body side battery 4 by fine currents, and supplementarily charges the spare battery 5 by fine currents.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a charging circuit for a rechargeable vacuum cleaner for general household use.

BACKGROUND OF THE INVENTION A conventional rechargeable vacuum cleaner has a main body (
9) has a built-in battery αω, and when the voltage of battery 0Φ reaches the usage limit, the charger (11) is connected to the main body (9), and the battery 00) inside the main body reaches a predetermined voltage E1. The battery is equipped with a charging circuit that charges the battery with a large current until the battery voltage reaches a second predetermined voltage E2. In some cases, a charger is also used in which the battery is charged after it has been removed from the vacuum cleaner body.

Problems to be Solved by the Invention In such conventional rechargeable vacuum cleaners, when the battery voltage inside the main body drops to the usable limit, the vacuum cleaner cannot be used during that time because normally only the battery inside the main body is charged, which reduces efficiency. Not the point. Also, if you try to charge the internal battery and the spare battery at the same time, the charger's transformer will become larger and the rating of the elements used in the charger will increase.
There was a problem in that the charging circuit was expensive.

In view of the above points, the present invention provides a charging circuit that can alternately charge the internal battery and the spare battery in succession.

Means for Solving the Problems In order to achieve the above object, the present invention is a circuit that continuously charges a battery in a vacuum cleaner body and a spare battery, and transforms, rectifies, and smoothes a commercial AC voltage. It consists of a power source for extracting the necessary direct current, and a switching control circuit for switching and supplying the direct current, and the switching control circuit first supplies direct current to the battery in the main body so that the battery voltage reaches the first predetermined voltage E1. Main charging is performed using a large current to substantially fill the battery capacity until reaching the battery capacity, and then DC is switched and supplied to the spare battery to perform the same main charging, and then the DC supply circuit is connected to the battery load in the main body. Then, supplementary charging is performed with a minute current until this battery voltage reaches a second predetermined voltage E2 indicating that 100% of the battery capacity has been charged, and then the DC supply circuit is switched to the spare battery load again and the same process is performed. This is a charging circuit for a rechargeable vacuum cleaner that detects voltage and controls switching to perform supplementary charging.

Effects According to the above configuration, by alternately charging the battery inside the main unit and the spare battery, the transition from high-current charging to micro-current charging is not repeated due to battery switching, and as a result, the battery can be efficiently charged. It can be recharged and the ratings of components used in the charging circuit can be reduced.

Example Embodiments of the invention will be described with reference to the accompanying drawings.

FIG. 1 is a perspective view of a charging stand (2) equipped with the charging circuit of the embodiment, and a vacuum cleaner body (3) with a built-in battery (4) and a spare battery (5) are installed in this charging stand (2). Charging is performed by connecting the battery and inserting the plug (6) into an outlet.

Further, as shown in Fig. 2, the charging circuit (1) of the present invention has a plug (6) and a circuit connected to the plug (6) for transforming, rectifying and smoothing a commercial AC voltage to extract the necessary DC. It is composed of a power supply circuit (7) and a switching control circuit (8) for switching and supplying the DC taken out from the power supply circuit (7) to either of the two battery loads, and this charging circuit fil includes a vacuum cleaner. A battery (4) built into the main body and a spare battery (5) are connected.

FIG. 3 is a flow diagram showing an alternate charging method using this charging circuit fl). As shown in Figure 3, when the main body (3) and spare battery (5) are connected to the charging stand (2),
The battery (4) inside the main body is charged preferentially. That is, first, the charging circuit (1) primarily charges the main body battery (4) with a large current. Through this main charging, the battery is charged to a voltage E corresponding to about 90% of the battery capacity. When the charging circuit (1) detects that the voltage of the main body battery (4) has reached the predetermined voltage E, the spare battery (5)
) to perform main charging, and main charging is performed until the voltage of the spare battery (5) reaches a predetermined voltage E. Next, the circuit (1) is switched to supplementally charge the main body battery (4) with a minute current.

Voltage E2 corresponding to 100% of battery capacity due to supplementary charging
Charge up to. The charging circuit (1) charges the main body battery (4)
Supplementary charging is completed when it is detected that the voltage of ) has reached the predetermined voltage E2, and then the circuit (1+) is switched to supplementally charge the spare battery (5) to the predetermined voltage E2.

Please note that the main unit (4) or a spare battery (5) is attached to the charging stand (2).
) can be used even if only one of them is connected, and two spare batteries can be charged by connecting a spare battery instead of the main body (4).

In this way, when the machine body (3) and spare battery (5) are set at the same time, priority is given to charging the main body battery (4) first, and once charging is complete, the charging stand (2) ) The vacuum cleaner can be used as is by removing the main body (3) from the main body (3), and since the system charges two batteries one at a time in succession, parts with low ratings can be used. , charging circuits can be created at low cost.

Effects of the Invention According to the present invention, by sequentially and alternately charging two batteries, a charging circuit can be created at low cost using components with low ratings. In addition, when the main unit and a spare battery are set at the same time, the battery inside the main unit is charged first, and the next time the vacuum cleaner is used, the main unit can be removed from the charging stand and used as is, providing an easy-to-use charging circuit. be able to.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing a charging stand equipped with a charging circuit according to an embodiment of the present invention, FIG. 2 is a block diagram showing the configuration of a charging circuit according to the embodiment, and FIG. FIG. 4 is a flow diagram showing an example of an alternate charging method. FIG. 4 is a perspective view showing a conventional charging method for a rechargeable vacuum cleaner. +11...Charging circuit (3)...Vacuum cleaner body (4)...Battery inside the main body (5)...Spare battery (7)...Power supply Circuit (8)...Switching control circuit Patent applicant Matsushita Electric Industrial Co., Ltd. Agent Kenbu Arata (1 other person)
Figure 1 Figure 2

Claims (1)

[Claims] (1) A circuit that continuously charges the battery in the vacuum cleaner body and a spare battery, and a power source for transforming, rectifying, and smoothing a commercial AC voltage to extract the necessary DC, and a switching supply of the DC. Consists of a switching control circuit to perform
The switching control circuit first supplies direct current to the battery in the main body, performs main charging with a large current to substantially fill the battery capacity until the battery voltage reaches a first predetermined voltage E_1, and then supplies direct current to the spare battery. After switching the supply and performing the same main charging, the DC supply circuit is returned to the battery load in the main body, and this battery voltage reaches a second predetermined voltage E_2 indicating that 100% of the battery capacity has been charged. A rechargeable vacuum cleaner characterized in that voltage detection and switching control are performed so that supplementary charging is performed with a minute current until the DC voltage is reached, and then the DC supply circuit is switched to a spare battery load again to perform the same supplementary charging. charging circuit.