JP3173324B2 - Rechargeable electric equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to relates to a rechargeable electric power equipment used in a portable sprayer of spraying an agent agricultural chemicals.

[0002]

2. Description of the Related Art A portable sprayer used for spraying a drug on trees or plants has a structure in which a drug held in a container of a sprayer body is sprayed from a nozzle tip by an electric pump housed in the body. are doing. Conventionally, the power for driving the electric motor of such an electric device, primary battery has been mainly used. However, an electric motor using a rechargeable secondary battery
The demand for commercialization of the equipment was high.

[0003] Such an electric device, simply by opening and closing the power switch, controlled the operation of the electric motor.
Therefore, when the discharge voltage of the battery falls below the operable voltage of the motor, even when the power supply switch is in the closed state, the electric motor does not operate.

[0004] In the electric equipment <br/> rechargeable using a secondary battery to a power source, the operation of the electric motor is stopped due to a decrease in discharge voltage, while the power switch in the closed state, subsequently when subjected to charging In addition, the electric motor may malfunction due to the supply of current from the charger. For this reason, the main body of the rechargeable electric device is provided with a mechanism for preventing the malfunction by detecting a connection state between a charging jack provided in the main body and a charging plug of the charger. I was

[0005]

However, according to the above-mentioned conventional configuration, charging is terminated while the power switch is kept closed, and the connection between the charging jack provided on the main body and the charging plug of the charger is disconnected. when the electric motor is there is a problem that work.

[0006] Further, even when the voltage of the secondary battery becomes lower than the lower limit of use, the battery may continue to be used and may be left in an overdischarged state. Due to this overdischarge, the cycle life of the secondary battery deteriorates rapidly. Therefore, an overdischarge prevention circuit is added to avoid overdischarge of the secondary battery, thereby preventing overdischarge of the secondary battery. However, even when such an overdischarge prevention circuit is provided, a state occurs in which the electric motor is stopped while the power switch is closed. It charges the secondary battery in this state, the voltage of the secondary battery electric motor for not user wishing to rise above a predetermined value there is a problem that will operate at.

As described above, the rechargeable type is contrary to the user's wishes.
When the electric motor of the electric device is operated, there is a possibility that a situation unfavorable for the user may occur.

An object of the present invention is to provide a rechargeable electric device which can utilize the capacity of a secondary battery to the maximum without deteriorating the cycle life of the secondary battery and which is easy to use. With the goal.

[0009]

A rechargeable electric device according to the present invention comprises: a secondary battery; a charger for charging the secondary battery;
A charging plug is an output terminal of the charger, and a power switch connected to the secondary battery, an electric motor, an electronic switch provided between the electric motor and the power supply switch,
A charging jack connected to the secondary battery, and a control circuit for controlling the electronic switch according to a connection state between the charging plug and the charging terminal jack and an open / closed state of the power switch. When the secondary battery is charged by connecting the charging jack and the charging plug when the switch is closed, the electronic switch is opened by the control circuit, and the charging jack and the charging plug are removed while the electronic switch is open. Also, the electronic switch is kept open by the control circuit, and until the power switch is opened.
This keeps the electronic switch open.

Further, in order to prevent the secondary battery from being over-discharged, the rechargeable electric device according to the present invention is arranged such that, when the voltage of the secondary battery becomes smaller than a predetermined value, the control circuit opens the electronic switch, It has a configuration in which a decrease in voltage is notified by a display.

[0011]

According to this configuration, when the power switch is in the closed state, the electric power is not supplied even if the connection between the main body and the charger is released after charging is completed.
It is possible to prevent the machine from unexpectedly operating.

Further, when lower than lower limit operating voltage, the control circuit is forcibly stop the operation of the motor without deteriorating the cycle life of the secondary battery, and maximum use capacity of the secondary battery it is possible to operate the motor.

[0013]

An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 shows a rechargeable electric motor according to an embodiment of the present invention.
FIG. 2 is a circuit block diagram of a sprayer, which is a kind of equipment , and FIG.
Is a specific circuit diagram thereof.

1 and 2, reference numeral 1 denotes a secondary battery built in the sprayer main body, 2 denotes a diode, 3 denotes a charging jack provided on a side surface of the main body, 4 denotes an electronic switch including a transistor, and 5 denotes a transistor. , 6 is a control circuit, 7 is an electric pump equipped with a motor, 8 is a charging plug on the charger side, 9 is a voltage warning indicator of a secondary battery made of LED, 10 is a comparator, 11 is a low voltage detection circuit, Reference numeral 12 denotes a power switch, 13 denotes a charger, and 14 denotes a capacitor.

FIG. 3 shows a schematic diagram of a sprayer using the rechargeable electric pump according to the present invention. In this sprayer, a medicine tank 22 for storing a medicine such as an agricultural chemical is located at an upper portion of the sprayer main body 21, and the medicine supplied from the medicine container 22 is connected to the sprayer main body 21 by the electric pump 7. Through the hose 26, the nozzle body 24
And sprayed from a spray nozzle 25 located at the tip of the nozzle body 24.

On the other hand, the secondary battery 1 which is a power supply for driving the electric pump 7 is accommodated in a lower part of the medicine tank 21.
During charging, the secondary battery 1 is charged by a charger connected to the charging jack 3.

The operation of the atomizer is controlled by opening and closing the power switch 4 provided on the side of the atomizer body 21. The state of charge of the secondary battery 1 and the operation state of the electric pump 7 are the same as those shown in FIGS. It is monitored and controlled by the circuit board 23 having it.

The operation of the rechargeable electric pump configured as described above will be described below.

First, in FIGS. 1 and 2, when the secondary battery 1 is fully charged, when the power switch 12 is closed rather than open.
A current flows through the capacitor 14 to the base of the electronic switch 4. The electronic switch 4 is closed for a time determined by the time constant of the CR, and the control circuit 6 operates. At this time, the voltage of the secondary battery 1 is sufficiently high, the comparator 10 outputs High, and the base current flows through the transistor 5. As a result, the base current continues to flow through the electronic switch 4 composed of a transistor.

For this reason, the control circuit 6 and the electric pump 7
Keep working. At this time, the low voltage detection circuit 11 controls the voltage warning indicator 9 to display the current secondary battery voltage.

When the voltage of the secondary battery 1 decreases, the low voltage detection circuit 11 controls the voltage warning indicator 9 to indicate that the voltage of the secondary battery 1 has decreased.

When the voltage of the secondary battery 1 drops to the lower limit voltage for use, the output of the comparator 10 goes low, so that the base current of the transistor 5 is cut off and the electronic switch 4
Is opened. Therefore, the control circuit 6 and the electric pump 7
Stops its operation even though the power switch 12 is in the closed state. Thereby, overdischarge of the secondary battery 1 can be prevented.

In this state, when the charging plug 8 on the charger side is connected to the charging jack 3, a voltage is applied from the charger 13 to both ends of the secondary battery through the diode 2.
However, since the capacitor 14 is in a fully charged state, no base current flows through the electronic switch 4. For this reason, the electronic switch 4 keeps the open state, and the electric pump 7 keeps the stop state even though the power switch 12 is in the closed state. The secondary battery 1 can be charged.

When the power switch 12 is closed, the rechargeable battery 1
When the charging is completed and the connection between the charging jack 3 and the charging plug 8 on the charger side is released, the base current does not flow through the electronic switch 4 because the capacitor 14 is fully charged. Keep open. Therefore, the electric pump 7 does not operate carelessly. However, once the power switch 12 is opened, the capacitor 14 discharges through the resistor. If the power switch 12 is closed again, a current flows through the capacitor 14 to the base of the electronic switch 4. Is closed.

Although the voltage warning display 9 is an LED display in the above embodiment, it may be a liquid crystal display or a buzzer.

[0027]

As described above, the present invention provides a secondary battery, a charger for charging the secondary battery, a charging plug connected to the charger, and a power switch connected to the secondary battery. , an electric motor, an electronic switch provided between the electric motor and the power supply switch, a charging jack connected to the secondary battery, and the charging plug and the connection status with the charging jack of the power switch By providing a control circuit for controlling the electronic switch according to the open / close state and a low-voltage detection circuit having a comparator for controlling the voltage warning indicator based on the voltage of the secondary battery, excellent ease of use and excellent charging It is possible to realize a type electric device .

[Brief description of the drawings]

FIG. 1 is a circuit block diagram of a sprayer according to an embodiment of the present invention.

FIG. 2 is a specific circuit diagram of the same.

FIG. 3 is a schematic configuration diagram of a sprayer according to an embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Secondary battery 2 Diode 3 Charging jack 4 Electronic switch 5 Transistor 6 Control circuit 7 Electric pump 8 Charging plug 9 Voltage warning indicator 10 Comparator 11 Low voltage detection circuit 12 Power switch 13 Charger 14 Capacitor 21 Nebulizer main body 22 Chemical tank 23 circuit board 24 nozzle body 25 spray nozzle 26 hose

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) H02J ^7/ 00-7/12 H02J ⁷ /34-7/36

Claims (3)

(57) [Claims] 1. A secondary battery, a charger for charging the secondary battery, a charging plug as an output terminal of the charger,
A power switch connected to the secondary battery, an electric motor,
An electronic switch provided between the electric motor and the power supply switch, a charging jack connected to the secondary battery,
In the charging plug and the charging terminal jack of the constructed rechargeable electric equipment <br/> by a control circuit for controlling the electronic switch according to the opening and closing state of the connection status and the power switch, the power switch is closed When charging the secondary battery by connecting the charging jack and the charging plug, the control circuit opens the electronic switch, and the control is performed even if the charging jack and the charging plug are removed while the electronic switch is open. A rechargeable electric machine characterized in that an electronic switch is kept open by a circuit and keeps the open state of the electronic switch until the power switch is opened. 2. The control circuit has a function of controlling an electronic switch according to a voltage of the secondary battery. When the power switch is in a closed state and the voltage of the secondary battery becomes lower than a predetermined value, 2. The rechargeable electric device according to claim 1, wherein the control circuit opens the electronic switch. 3. A low-voltage detection circuit for monitoring a voltage of a secondary battery, and a voltage warning indicator controlled by an output of the low-voltage detection circuit, wherein the voltage of the secondary battery drops below a set value. 2. The rechargeable electric device according to claim 1, wherein the voltage warning indicator is controlled to display a warning of a voltage drop.