KR100352330B1 - Over charge/over discharge portection circuit for rechargerble battery of vaccum cleaner - Google Patents

Abstract

PURPOSE: A protection circuit against excess charging/discharging of battery in vacuum cleaner is provided to extend service time of the battery and to prevent reduced efficiency thereof. CONSTITUTION: The circuit comprises DC input terminal(10) to pass DC current to charge a battery(40), overcharging protection part(20) and over-discharging protection part(30). The overcharging protection part(20) is for charging the battery(40) by using DC power source and stopping the charge of battery by supplying trace of current. The over-discharging protection part(30) is for driving a vacuum motor(50) of the cleaner by supplying power from the battery(40) and for blocking current flow applied to the vacuum motor(50) when the discharged voltage is below determined value.

Description

Overcharge / over discharge portection circuit for rechargerble battery of vaccum cleaner}

The present invention relates to an overcharge / over-discharge protection circuit of a vacuum cleaner rechargeable battery, and more particularly, to prevent a rechargeable battery built in a vacuum cleaner, etc., from shortening the life and reducing efficiency by repeated overcharging and / or overdischarging. Therefore, the present invention relates to an overcharge / over-discharge protection circuit of a vacuum cleaner rechargeable battery that can extend the life of the rechargeable battery and further utilize the rechargeable battery at maximum efficiency.

Vacuum cleaners, which are used to remove dirt and debris from the floor, are common in most homes. A vacuum cleaner generates a strong suction force using a motor to inhale air, and collects vinyl fragments, dust, and debris contained in the sucked air into the filter, and discharges the purified air to the outside for cleaning. It is a convenient device that reduces housework of housewives.

Since the vacuum cleaner uses a large motor capacity to maintain a strong suction force, the weight of the vacuum cleaner itself increases, which makes it difficult for housewives to use, and also requires an electrical cord to be connected at all times to prevent cleaning. It caused inconvenience in use such as reconnecting the power cord to the moving place.

In order to solve the problem of power supply, a rechargeable vacuum cleaner using a rechargeable battery has been developed and used. When not using a rechargeable vacuum cleaner, the commercial power is modulated by direct current to charge the rechargeable battery using an adapter, and when used, it is used in a state where the power cord is removed.

However, the use time is determined according to the charge capacity of the rechargeable battery, there was a problem that can not be used for a long time. In addition, the adapter used in the conventional rechargeable vacuum cleaner is not only separated from the vacuum cleaner but also has a function of simply charging the rechargeable battery, so that the rechargeable battery is overcharged or discharged at a high voltage, which is fatal to the life of the rechargeable battery. There was a problem affecting. Such a problem has a bad effect on the product recognition of buyers, which has a huge impact on sales.

The present invention has been made to solve the above problems, an object of the present invention is to prevent the battery life is reduced by the repetition of overcharging and or over-discharge of the rechargeable battery built in a vacuum cleaner, etc. It is to provide an overcharge / over discharge protection circuit of a vacuum cleaner rechargeable battery that can extend the life of the battery and further utilize the rechargeable battery at maximum efficiency.

The overcharge / over-discharge protection circuit of the vacuum cleaner rechargeable battery of the present invention for achieving the above object, when charging the rechargeable battery using a DC power input through the DC input terminal unit, when the charge is completed to the full charge voltage Stopping the charge, supplying a small current to prevent the rechargeable battery from being charged above the full charge voltage, and to drive the vacuum motor using the power supplied from the rechargeable battery to discharge the battery It is composed of an over-discharge prevention unit to cut off the power applied to the vacuum motor when the voltage falls below a predetermined voltage.

1 is a side view of a conventional vacuum cleaner,

2 is a block circuit diagram of an overcharge / overdischarge protection circuit according to the present invention;

3 is a detailed circuit diagram of an embodiment of an overcharge / overdischarge protection circuit according to the present invention;

4 is a flowchart showing an operating state of an overcharge / overdischarge protection circuit of the present invention;

<Description of the symbols for the main parts of the drawings>

1: vacuum cleaner 3: handle

5: on / off switch 7: manual switch

9: floor suction port 10: DC input terminal part

20: overcharge protection 30: over-discharge prevention

40: rechargeable battery 50: vacuum motor

101: Handy input terminal 102: Base input terminal

103: relay 104: first switch

105: second switch Q1, Q3, Q4, Q5: transistor

SCR: Thyristor LD1, LD2, LD3: Light Emitting Diode

D1, D2, D3, D4: Diode

Hereinafter, the overcharge / over-discharge protection circuit of the vacuum cleaner rechargeable battery of the present invention will be described in detail with reference to the accompanying drawings.

The present invention is a charging and discharging device for prolonging the life of the battery and efficiently using the rechargeable battery in a rechargeable vacuum cleaner using the rechargeable battery to prevent overcharging and / or overdischarging.

1 is a side view of one embodiment of a conventionally used rechargeable vacuum cleaner 1, the upper side is provided with a handle 3 for human grabbing, the on / off switch 5 is installed adjacent to the handle (3) In the middle portion, a manual switch 7 capable of directly controlling a vacuum motor for generating a suction force is provided. The on / off switch 5 and the manual switch 7 have a difference in the installation position but serve to operate the vacuum motor by turning on the vacuum cleaner. This is explained in detail later with reference to FIG. 3.

In addition, the bottom suction port 9 is provided at the bottom of the vacuum cleaner 1, and cleaning can be easily performed by moving the vacuum cleaner 1 in a state where a person is standing upright. Although not shown inside the bottom suction opening 9, a brush or the like is installed to sweep in a broom, so that foreign substances are easily sucked.

The user presses one of the on / off switch 5 or the manual switch 7 to operate the vacuum cleaner. When the switch is turned on and the rechargeable battery is charged, power is supplied to the vacuum motor to start the intake of air, including dust. In addition, although not shown in detail, the main body of the vacuum cleaner exposes an adapter terminal (DC input terminal portion 10) for supplying power for charging, thereby charging the battery by combining the adapter terminal with the DC input terminal portion during charging.

2 is a block diagram of an overcharge / over-discharge protection circuit of the vacuum cleaner rechargeable battery of the present invention. As shown, the DC input terminal 10, the overcharge preventing unit 20, the rechargeable battery 40, the over-discharge preventing unit 30, and the vacuum motor 50 is displayed, the overcharge preventing unit 20 Charge through the rechargeable battery 40 and stop charging when the full charge voltage exceeds, discharge from the rechargeable battery 40 to supply power to the vacuum motor 50 through the over-discharge prevention unit 30 and over discharge When a transition is detected, it cuts off the power supply.

Figure 3 is a detailed circuit diagram of an embodiment of the overcharge / over discharge protection circuit of the vacuum cleaner rechargeable battery of the present invention as described above.

The DC input terminal unit 10 is for supplying power required to charge the rechargeable battery 40. The DC power input through the DC input terminal unit 10 is a DC voltage converted through a stop value (adapter). The DC input terminal unit 10 is separated into the base input terminal 101 and the handy input terminal 102, but are all connected to the rear end. These are all connected to the output terminal of the adapter (not shown) to supply the charging voltage, and are provided in the main body of the vacuum cleaner 1 of FIG.

When DC power is applied to the DC input terminal unit 10 to charge the rechargeable battery 40 without using the vacuum cleaner 1, the transistor Q1 acting as a supply unit of the charging current is turned on and the charging current is diode ( The relay 103 is supplied to the relay 103 via D1 and D2. At the same time, the light emitting diode LD1 emits light and indicates to the outside that the rechargeable battery 40 is currently being charged. In this use state, the contact point of the relay 103 is set such that the overcharge preventing unit 20 and the rechargeable battery 40 are connected.

Relay 103 is a two-pole relay, one contact point (a) is connected to the rechargeable battery 40, the other contact point (b) is connected to the vacuum motor 60, the vacuum cleaner is in charge The circuit is configured to charge the battery 40. When the state of charge continues with the DC power connected, the rechargeable battery 40 reaches a full charge state.

When the rechargeable battery 40 is charged in the full charge state, the full charge state is sensed by the IC used as the charge state detection unit, and the IC turns on the transistor Q3. At the same time, the transistor Q1 is turned off so that the charging current supplied to the rechargeable battery 40 is cut off, and the light emitting diode LD1 is also turned off. When the transistor Q3 is turned on, current flows from the DC input terminal portion 10 through the light emitting diodes LD2 and LD3, and since the light emitting diodes LD2 and LD3 emit light, the rechargeable battery 40 is fully charged. It can be checked externally. At the same time, the current flowing through the circuit by the IC becomes a trigger current having a small value, so that charging can be continued against natural discharge, thereby preventing a decrease in efficiency due to discharge.

In addition, since the zener diode ZD2 used as the full charge preventing part is connected to the rechargeable battery 40 in parallel, the charging battery 40 is prevented from being charged beyond the voltage by the zener diode ZD2, thereby charging from overcharge. The battery 40 is effective to protect the safety. The set voltage of the zener diode is preferably determined to be the same as the set voltage of the rechargeable battery 40.

In addition, when the rechargeable battery 40 is operated to perform cleaning using the vacuum cleaner 1 in a fully charged state, the vacuum motor 50 is driven using the power of the rechargeable battery 40. The vacuum cleaner is activated by turning on either one of the first switch 104 or the second switch 105 for operation. The first switch 104 or the second switch 105 is essentially the same switch as the on / off switch 5 or the manual switch 7 shown in FIG.

When one of the first or second switches 104 and 105 is turned on, a current flows in the coil of the relay 103 so that the contact is switched from a to b and the vacuum motor 50 starts to operate. When the vacuum motor 50 is operated, a strong suction force is generated to suck the air containing the dust to pass through the filter (not shown) to remove the dust and discharge the filtered air.

This will be described in more detail as follows. When the first or second switches 104 and 105 are turned on, a voltage is supplied from the rechargeable battery 40 in the fully charged state through the diode D4 to turn on the transistor Q4. When the transistor Q4 is turned on, current flows to the collector side, so that current flows in the coil of the relay 103. Accordingly, the contact point of the relay 103 is switched from a to b so that the power is connected to the vacuum motor 50. The vacuum motor 50 starts to operate. When the vacuum motor 50 starts to operate, the voltage of the rechargeable battery 40 drops as time passes. The relay 103 is a part that performs input / output switching.

When the voltage drops to a certain level, overdischarge occurs, so that the power supply is cut off from the rechargeable battery 40 to prevent this. Zener diode ZD3 is used to detect the voltage drop. When a voltage lower than the voltage set in the zener diode ZD3 is supplied from the rechargeable battery 40, the transistor Q5 connected to the zener diode ZD3 is turned on and the SCR is turned on. SCR acts as a voltage detector for overdischarge.

Accordingly, the transistor Q4 is turned off and the current flowing through the relay 103 is cut off, thereby bringing the relay contact back to b → a. Therefore, the power supply from the rechargeable battery 40 is cut off and the operation of the vacuum motor 50 is stopped. In this manner, excessive discharge of the rechargeable battery 40 can be prevented.

When the rechargeable battery 40 is discharged, the rechargeable battery 40 is charged again through the above charging process. Since the SCR may be operating while the over-discharge circuit is operated in the discharged state and the operation is stopped, the SCR is turned off by turning off the first switch 104 or the second switch 105, Turn the switch on after using the terminal.

The operation state of the overcharge / over-discharge protection circuit of the vacuum cleaner rechargeable battery of the present invention will be described in detail with reference to FIG.

First, when the adapter is connected to the DC input terminal unit 10 to charge the rechargeable battery 40, the charging source 40 is connected to a current source to start charging. At the same time, the overcharge protection unit 20 detects whether the charging voltage reaches the full charge voltage point set according to the characteristics of the battery.

When it is determined that the voltage supplied to the rechargeable battery 40 reaches the full charge voltage point while the charging is completed, the DC voltage is stopped and the trigger current is supplied through the overcharge prevention unit 20 by the IC. When the trigger current is supplied, since the current supply amount is significantly reduced, overcharging is prevented and deterioration of the rechargeable battery 40 due to overcurrent is reduced. In addition, it is possible to prevent the discharge due to natural discharge, there is an advantage that can be used up to the maximum efficiency of the rechargeable battery.

In the case of cleaning by operating the vacuum cleaner, the electric circuit is constituted by turning on one of the switches (first or second switch) so as to discharge from the rechargeable battery 40. At this time, the power supply from the overcharge protection unit 20 is cut off in circuit, and power is supplied from the rechargeable battery 40 to the vacuum motor 50 through the over-discharge prevention unit 30. When a current is supplied from the rechargeable battery 40, a voltage is supplied to the vacuum motor 50 to perform a cleaning operation.

At the same time, it operates to sense the predetermined voltage (end voltage: the voltage value set to stop the discharge of the rechargeable battery) and stop the operation of the vacuum motor. The end voltage may be changed according to the characteristics of the battery. When the end voltage is detected, the load is cut off and the power supply is stopped, thereby preventing the battery from being burned out. The termination voltage can be set to 3V, for example.

The full charge voltage point in the overcharge circuit and the predetermined voltage (final voltage) in the overdischarge circuit are hardened according to the rechargeable batteries used in all vacuum cleaners. That is, the charging battery 40 used for the vacuum cleaner is changed according to the charging voltage and the discharge voltage determined at the time of designing the charging battery 40 used for the charging voltage and the discharge voltage, respectively. These can be constructed using zener diodes.

As described above, according to the present invention, a rechargeable battery built in a vacuum cleaner or the like prevents the life of the rechargeable battery from being shortened due to overcharging and / or overdischarging and the efficiency thereof is lowered, thereby extending the life of the rechargeable battery and further improving the rechargeable battery. There is an advantage available at maximum efficiency.

Although the invention has been described in detail only with respect to the described embodiments, it will be apparent to those skilled in the art that modifications and variations can be made within the spirit and scope of the invention, and such variations or modifications will belong to the appended claims. .

Claims (3)

The rechargeable battery 40 is charged using a DC power input through the input terminals 101 and 102 of the DC input terminal unit 10 by charging the rechargeable battery and supplying power from the charged battery to drive the vacuum motor. Charge, stop charging when the charge is completed up to the full charge voltage, the overcharge protection unit 20 to prevent the charge battery 40 is charged above the full charge voltage by supplying a small current and the rechargeable battery Over-discharge prevention unit for driving the vacuum motor 50 using the power supplied from the 40 and cuts off the power applied to the vacuum motor 50 when the discharge voltage of the rechargeable battery 40 falls below a predetermined voltage ( In the overcharge / over discharge protection circuit of the battery consisting of 30), The overcharge prevention unit 20 supplies a charging current input through the transistor Q1 and a charging current input through the transistor Q1 to the relay 103 using a voltage input through the power supply unit 10. Supplies D1, D2 for charging the battery 40, light emitting diode LD1 for indicating the state of charge, IC for detecting the full charge state of the battery 40, and full charge state Is detected, the transistor Q3 turns on by the control signal from the IC to turn off the transistor Q1, and the light emitting diode LD2 for displaying a fully charged state as a current flows as the transistor Q3 turns on. LD3), a zener diode ZD2 connected to prevent the battery 40 from being overcharged above a set voltage of the zener diode, a plurality of resistors and capacitors for voltage regulation, The over-discharge prevention unit 30, when the first switch or the second switch (104, 105) is turned on by the diode D4 through which the current supplied from the battery 40 passes, and by the current passing through the diode D4 The transistor Q4 to be turned on, the relay 103 for supplying power to the vacuum motor 50 from the battery 40 by switching the contact as the transistor Q4 is turned on, and the use of the vacuum motor 50 Zener diode ZD3 for detecting the voltage drop of the battery 40 due to the first and second transistors Q5 turned on when a voltage lower than the voltage set in the zener diode ZD3 is applied to the vacuum motor 50. A thyristor SCR that is turned on as the transistor Q5 is turned on to turn off the transistor Q4, An overcharge / over-discharge protection circuit for a vacuum cleaner rechargeable battery, characterized in that the battery 40 is prevented from being overcharged or overdischarged during use to extend the life of the battery and to maximize efficiency. The method of claim 1, The full charge voltage value in the overcharge protection unit 20 and the predetermined voltage in the overcharge protection unit 30 are changed according to the set values of the zener diodes ZD2 and ZD3, regardless of the charge voltage of the battery 40. An overcharge / overdischarge protection circuit of a vacuum cleaner rechargeable battery, characterized in that it is used. delete