JP2003269858A - Refrigerator for HC refrigerant - Google Patents

Abstract

(57) [Summary] When a switch using a high voltage of a commercial power supply as a contact is provided in a refrigerator when a heat-resistant HC refrigerant is used as a refrigerant,
May ignite when refrigerant leaks. The present invention solves the above-mentioned problem by providing an AC 60.
A power transformer stepped down to V or lower, a rectifier circuit for rectifying the output of the power transformer, an interior light drive circuit for turning on and off the interior light, and a refrigerator door switch for turning on and off the interior light drive circuit And the voltage applied to the switch in the refrigerator is set to be lower than the explosion-proof voltage.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a refrigerator interior light drive device that uses an HC refrigerant.

[0002]

2. Description of the Related Art A conventional refrigerator refrigerant uses hydrofluorocarbon (hereinafter referred to as HFC) that does not contain chlorine in its molecule, uses a xenon lamp as a room light, and turns on and off the room light. Connect the refrigerator door switch to a commercial power source and open / close the refrigerator door to turn on the interior light,
There is a refrigerator interior light drive device configured to be turned off.

In this refrigerator interior light driving device, since HFC is used as the refrigerant, there is no concern that the refrigerant will ignite and explode due to sparks when the refrigerator door switch is turned on and off, and an explosion-proof test is required. There is no such thing, but when using an HC refrigerant that has an extremely low effect on global warming as the refrigerant, the refrigerator door switch part set in the refrigerator turns on and off the commercial power supply, and the spark of the electrical contact makes the refrigerant There is a possibility of catching fire when is leaked into the refrigerator.

[0004]

When HC is used as the refrigerant, it is a heatable refrigerant, so if a switch with the high voltage of the commercial power source as a contact is inside the refrigerator, it is possible to catch fire if the refrigerant leaks. Therefore, it is necessary to conduct explosion-proof tests and evaluate safety.

An object of the present invention is to provide a refrigerator interior light drive device for a refrigerator compatible with HC refrigerant.

[0006]

According to the present invention, there is provided an internal lamp lighting circuit for a refrigerator which adopts the HC refrigerant cycle,
A power supply transformer having a voltage of 60 V AC or less, a rectifying circuit for rectifying the output of the power supply transformer, an interior lamp drive circuit for turning on and off the interior light, and an on-drive for the drive circuit,
A refrigerator door switch for turning it off is provided, and the interior light is turned on and off at an AC explosion-proof voltage or less. Also, when the switch is exposed to high humidity environment, the AC power supply is opened and closed,
It is also possible to avoid poor contact electrolytic corrosion.

According to such a configuration, the voltage applied to the refrigerator door switch can be set to an AC low voltage by the power transformer, and JEMA-HD092 (voluntary standard) created by the Japan Electrical Manufacturers' Association based on IEC60335. ) Of 17. According to the items of measuring instruments and potentiometers, in electronic and similar constant-voltage equipment used for the purpose of measurement, control or communication, the rated voltage of the equipment under consideration or the components of the equipment is AC 60V or DC 75V. If it does not exceed, it is exempted from the requirements of the explosion-proof test, and therefore, the explosion-proof test is exempted by setting the voltage applied to the refrigerator door switch to 60 V AC or less. Further, when the switch is exposed to a high humidity environment, the AC low voltage is opened and closed, so that electrolytic corrosion of the switch contact can be prevented.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described with reference to FIG. First, FIG. 1 shows a block diagram of a refrigerator interior light drive device. The input terminals of the power transformer 3 are connected to both terminals of the 100V commercial AC power supply 2. The AC output voltage of the power transformer 3 is lowered (AC voltage V
1) The AC voltage is 60 V or less, which does not require the explosion-proof test. In this embodiment, the alternating current is 20V.

The refrigerator door switch 4 has one end connected to the power transformer AC output voltage (AC voltage V1) and the other end connected to the rectifier circuit 5. By opening and closing the refrigerator door, the refrigerator door switch 4 is turned on and off, and the voltage for turning on and off the xenon lamp 7 which is the inside light is input to the inside light drive circuit 6 via the rectifier circuit 5. The xenon lamp 7 is turned on and off.

Next, regarding the circuit configuration of the rectifying circuit 5, FIG.
Will be described with reference to. The rectifier circuit 5 is a rectifier circuit 5 including a diode bridge 8 and a smoothing capacitor 9. The AC power source whose voltage has been reduced by the power transformer 3 is full-wave rectified by the diode bridge 8, and the voltage which is full-wave rectified by the smoothing capacitor 9 is smoothed (DC voltage V2).

A constant voltage circuit 1 composed of a regulator IC 11, a capacitor 10, a capacitor 12 and a capacitor 13 is provided for stabilizing the fluctuation of the commercial voltage.
5, the operation of the relay 14 due to the fluctuation of the power supply voltage can be stably performed.

Next, regarding the structure of the interior lighting drive circuit 6, a relay 14 is used in the interior lighting drive circuit 6. When the refrigerator door is opened, the refrigerator door switch 4 is turned on, the rectifier circuit 5 and the interior lamp drive circuit 6 are energized, and the relay 14 is turned on, so that the xenon lamp 7 is turned on.

On the contrary, when the refrigerator door is closed, the refrigerator door switch 4 is turned off, the voltage to the rectifier circuit 5 and the interior light drive circuit 6 is cut off, and the relay 14 is turned off, so that the xenon lamp is turned off. 7 turns off. In the present invention, the relay 14 is used for the interior light drive circuit 6, but a semiconductor element such as a triac may be used.

[0014]

As is clear from the above description, the refrigerator interior light driving apparatus adopting the HC refrigerant cycle of the present invention lowers the voltage applied to the refrigerator door switch, and the HC refrigerant generated by the spark of the switch. In addition to preventing ignition to, the applied voltage of the refrigerator door switch is AC 60V.
By the following, the safety of the refrigerator using the HC refrigerant can be improved and the explosion-proof test can be omitted. Further, by making the voltage applied to the refrigerator door switch an AC low voltage, it is possible to prevent contact corrosion of the refrigerator door switch.

[Brief description of drawings]

FIG. 1 is a block diagram showing a refrigerator internal lighting drive device according to an embodiment of the present invention.

FIG. 2 is a circuit diagram of a refrigerator interior light driving device according to an embodiment of the present invention.

[Explanation of symbols]

1 ... Refrigerator interior light driving device, 2 ... Commercial AC power supply, 3 ...
Power transformer, 4 ... Refrigerator door switch, 5 ... Smoothing circuit, 6 ... Interior light drive circuit, 7 ... Xenon lamp, 8
... Diode bridge, 9 ... Smoothing capacitor, 11 ...
Regulator IC, 14 ... Relay, 15 ... Constant voltage circuit.

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Takeshi Wakatabe             800 Tomita, Ohira-cho, Shimotsuga-gun, Tochigi             Hitachi Co., Ltd., Cooling & Heat Division F term (reference) 3L045 AA05 BA01 CA02 PA05 PA06

Claims (2)

[Claims] 1. A refrigerator internal light lighting circuit that employs hydrocarbon (hereinafter referred to as HC) as a refrigerant, a power transformer that is stepped down to 60 V AC or less, a rectifier circuit that rectifies the output of the power transformer, and the refrigerator. An interior light drive circuit for turning on / off the interior light and a refrigerator door switch for turning on / off the interior light drive circuit are provided, and the interior light is turned on / off at an AC explosion-proof voltage or less. Characteristic refrigerator. 2. The refrigerator according to claim 1, wherein the interior lamp drive circuit keeps the input voltage constant by a constant voltage circuit to turn on and off the interior lamp.