JP2579746Y2 - Electric pot - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric pot for heating and keeping a liquid such as water and supplying water to the outside, and more particularly to an improvement in a power supply circuit of a drive motor of a water supply pump.

[0002]

2. Description of the Related Art In a power supply circuit in an electric pot,
2. Description of the Related Art As a motor that drives a water supply pump can be driven not only by a DC power supply obtained by rectifying an AC current but also by a battery power supply charged by the DC power supply, for example, a motor as shown in FIG. (See JP-A-4-261613).

That is, the power supply circuit in this case is an AC power supply 1
A rectifier circuit 3 is connected via a transformer 2 to a DC power supply circuit 7 which applies a DC smoothed by a smoothing capacitor 4 to a motor 6 via a start switch 5. Further, a charging circuit 9 of a battery power supply 8 is connected to the DC power supply circuit 7, and in a normal state, DC power is supplied to the motor 6 by the DC power supply circuit 7 through a diode 10 to drive the water supply pump 11, and at the same time, The battery power supply 8 is charged by the charging circuit 9 including the diode 12 and the resistor 13. When the AC power supply 1 is not supplied, the battery power supply 8 is supplied to the motor 6 via the diode 14.

[0004]

The power supply circuit as described above has two power supply systems, a DC power supply obtained by rectifying the AC power supply 1 and a battery power supply 8. And the motor 6 and the pump 1
In order to solve this problem, a constant voltage circuit or the like is required, which causes an increase in cost.

In the above power supply circuit, the DC power obtained by rectifying the AC power 1 is supplied with priority over the battery power 8, and when the supply of the AC power 1 is stopped, the power is switched to the battery power 8. Switching circuit (diodes 10, 12, 1
4 and a circuit including the resistor 13), which also increases the cost.

Accordingly, the present invention provides an electric pot which can supply water even when no electric power is supplied from an AC power supply, and which can extend the life of a water supply pump and a driving motor thereof by a simple power supply circuit. The task is to

[0007]

In order to solve the above problems, the present invention has a motor for driving a water supply pump, a driving circuit for supplying battery power to the motor, and a charging circuit for charging the battery power. In the electric pot, the driving circuit and the charging circuit are made independent, and one of these circuits and the battery power supply are selectively connected by switching means.

[0008]

When the switching means is switched to the charging circuit side, the battery power is charged. When the switching means is switched to the drive circuit side, the motor and the pump are driven, and the motor and the pump are driven only by power supply from the battery power supply.

[0009]

In the embodiment shown in FIG. 1, a primary side of a transformer 2 is connected to an AC power supply 1 to reduce the voltage to a predetermined voltage, and a rectifier is applied to the secondary side of the transformer 2 as in the conventional case. Connect circuit 3 and
The AC is rectified into DC and a smoothing capacitor 4 is connected to the output side of the rectifier circuit 3 to smooth the rectified DC.

A changeover switch 15 provided on the output side of the rectifier circuit 3 includes a movable contact 16 and a normally closed fixed contact 1.
7 and a normally open fixed contact 18. The above movable contact 16
Is connected to the positive electrode of the battery power supply 8 and is operated in conjunction with a push button or the like (not shown). The above-mentioned normally closed fixed contact 17 is connected to the rectifier circuit 3, whereby the charging circuit 9 of the battery power source 8 is connected.
Is configured. In addition, the above-described normally-open fixed contact 18 is connected to the drive motor 6 of the water supply pump 11, thereby forming a drive circuit 19 for the motor 6 and the pump 11.

That is, the charging circuit 9 and the driving circuit 19 are separated at the changeover switch 15 and are independent, and the movable contact 16 is always in contact with the normally closed fixed contact 17;
The battery power supply 8 is charged, but no power is supplied to the motor 6. When the movable contact 16 is switched to the normally open contact 18 side, the charging circuit 9 is disconnected from the battery power supply 8 and the driving circuit 19 is formed, and the motor 6 and the water supply pump 11 are driven by the battery power supply 8, Water supply is performed.

In a power outage or in a place where connection to an AC power supply is not possible, the motor 6 and the pump 11 are driven only by switching the movable contact 16 to the normally open fixed contact 18 by charging the battery power supply 8 in advance. can do.

[0013]

As described above, in the present invention, the drive circuit of the water supply pump and the battery power supply charging circuit are independent, and one of these circuits and the battery power supply are switched by a switching means such as a switch. As an alternative connection,
When water is not supplied, the battery power is charged. At the time of water supply, the motor and the water supply pump are driven only by power supply from the battery power.

Since the voltage of the battery power source is stable with less ripple compared to the rectified DC power source, the life of the pump and the motor can be extended by a simple circuit according to the present invention.

[Brief description of the drawings]

FIG. 1 is a circuit diagram of an embodiment.

FIG. 2 is a circuit diagram of a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 AC power supply 2 Transformer 3 Rectifier circuit 4 Smoothing capacitor 5 Start switch 6 Motor 7 DC power supply circuit 8 Battery power supply 9 Charging circuit 10 Diode 11 Water supply pump 12 Diode 13 Resistance 14 Diode 15 Changeover switch 16 Movable contact 17 Normally closed fixed contact 18 Normally open fixed contact 19 Drive circuit

Claims (1)

(57) [Scope of request for utility model registration] 1. An electric pot having a motor for driving a water supply pump, a driving circuit for supplying battery power to the motor, and a charging circuit for charging the battery power, wherein the driving circuit and the charging circuit are independent. An electric pot characterized in that one of these circuits and the battery power source are selectively connected by a switching means.