KR880001436Y1 - Power circuit - Google Patents

Abstract

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Description

Voltage selection driving circuit of microwave oven

1 is a circuit diagram of the present invention.

2 is a conventional circuit diagram.

* Explanation of symbols for main parts of the drawings

L1, L2: Lamp Md: Output Control Motor

Mt: Timer Motor Mf: Fan Motor

C1 ~ C6: Connector Vs1, Vs2: Voltage Selection Connector

a, b, c, d: Selection terminal of voltage selection connector MG: Magnetron

T: transformer

The present invention relates to a mechanical microwave oven for both 100V / 220V, and particularly relates to a voltage selective drive circuit that can be used as a 100V / 220V without a single winding transformer, and can be used as a 100V component when used at 220V.

Mechanical microwave ovens for induction heating of food by high frequency electric field have been manufactured to use 100V / 220V power supply in order to expand the usable area. As it is possible to use 100V and 220V tap of single winding transformer according to input voltage by using single winding transformer as possible, it has disadvantages such as increase in manufacturing cost and workability by using expensive single winding transformer.

The present invention improves the above-mentioned shortcomings. Lamp and output control motor, timer motor, fan motor and high voltage transformer which constitute the internal circuit of the microwave oven when commercial AC voltage of 100V or 2200V is applied without using single winding transformer. The purpose is to provide a voltage selection driving circuit of a microwave oven in which each circuit element is connected in parallel or in series by switching the connector when a voltage of 100V or 220V is input to the magnetron, etc., so that a constant voltage is always supplied to the magnetron. have.

Hereinafter, the configuration, operation, and effects of the present invention will be described in detail with reference to the accompanying drawings.

The present invention is connected between both ends of the lamp (L1) (L2) connectors (C1) (C2) are connected to each other to form a closed circuit, while the connector (C3) is cross-connected between the lamp (L1) (L2), output control motor Connectors C4 and C5 are connected between both ends of the Md and the timer motor Mt to form a closed circuit, while the connector C6 is cross-connected between the output control motor Md and the timer motor Mt. Each power supply terminal of the fan motor Mf has a structure connected to the 100V supply terminal a and the 220V supply terminal C of the power selection connector Vs, respectively.

Unmarked 1 is plug, 2 is 3 fuse, 4 is safety switch, 5 is timer switch, 6 is summer switch, 7 is safety switch, 8 is output control switch, Vs2 is voltage select connector, T is high voltage transformer, T 'is a single winding transformer, MG is a magnetron, Ch is a high voltage capacitor, Dh is a high voltage diode, and L is a lamp.

1 is a circuit diagram of the present invention, one line of the main power line connected to the plug (1) fuse (2) (3) and voltage selection connector (Vs2), safety switch (4), timer switch (5), voltage selection The primary coil of the transformer (T) is connected through the connector (Vs1) in turn, and the other line of the main power line is connected to the transformer (T) through the thermal switch (6), the safety switch (7), and the output adjustment position (8). ) Primary coil is connected, the secondary coil of the transformer (T) is connected to the magnetron (MG) and high-pressure capacitor (Ch) high-pressure diode (Dhh). The connectors C1 to C6 and the voltage selection connectors Vs1 and Vs2 move in conjunction with each other.

2 is a circuit diagram of the related art, in which an output control motor Md, a timer motor Mt, a fan motor Mf, and a lamp L are prepared in case the voltage supplied to the internal circuit through the plug 1 changes. The single winding transformer (T ') is installed to supply the rated voltage to the lamp.The single winding transformer (T') is bulky, heavy, and expensive, which increases the cost of the manufactured product. There is a problem of deterioration.

On the contrary, in the circuit diagram of the present invention shown in FIG. 1, the single winding transformer T 'is deleted and designed to adjust the voltage by the connectors C1 to C6. When the 100V voltage is supplied, the lamp L1 and the lamp (L2), output control motor (Md) and timer motor (Mt) are connected in parallel, respectively, and when 220V voltage is supplied, lamp (L1), lamp (L2), output control motor (Md) and timer motor (Mt) Are connected in series to make normal operation. Referring to this operation in more detail based on FIG. 1, when the power supplied to the internal circuit through the plug 1 is 100V, the user supplies 100 voltage to the voltage selection connectors Vs1 to Vs2 and the connectors C1 to C6. In this case, the terminals (a), (b) and (e) are connected to the voltage selection connectors Vs1 and Vs2, and the connectors C1, C2, C4 and C5 are connected, and the connector C3 is connected. C6 is opened so that the lamp L1 and the lamp L2, the output control motor Md and the timer motor Mt are connected in parallel, respectively.

In addition, power is supplied to the fan motor Mf through the supply terminal a for 100V of the voltage selection connector Vs1. Therefore, the lamps L1 and L2, the output control motor Md, the timer motor Mt, the fan motor Mf, and the like operate normally under a voltage of 100V.

On the other hand, if the voltage supplied to the internal circuit through the plug (1) is 220V, the user switches the voltage selection connector (Vs1) (Vs2) and connectors (C1 ~ C6) to the 220V power supply terminal. Terminals C, d, and f are connected to Vs1 and Vs2, and connectors C1, C2, C4 and C5 are opened, and connectors C3 and C6 are connected to lamp L1. ), Lamp L2, output control motor Md and timer motor Mt are connected in series.

In addition, power is supplied to the fan motor Mf through the supply terminal C for 220V of the voltage selection connector Vs1. Therefore, the lamps L1, L2, the output control motor Md, the timer motor Mt, the fan motor Mf, and the like operate normally under a voltage of 220V.

Here, the lamp L1 and the lamp L2 are lamps having the same resistance, and the output regulating motor Md and the timer motor Mt use a motor having a standard of almost the same internal resistance. It doesn't work.

As described above, the present invention uses a lamp L1 and a lamp L2, an output regulating motor Md, and a timer motor Mt using elements having almost the same internal resistance, and when the voltage of 100 V or 220 V is supplied to the user, When operating voltage selection connector (Vs1) (Vs2) and connectors (C1 ~ C6), each connection point moves and each element is connected or operated in parallel or in series, so the cost of not using single winding transformer (T ') There is an advantage to save and improve workability.

Claims (1)

On both ends of the lamps L1 and L2, the connectors C1 and C2 are connected to each other to form a closed circuit, while the connector C3 is cross-connected between the lamps L1 and L2, and the output control motor Md is connected. The connector C6 is connected between the both ends of the timer motor Mt and the connectors C4 and C5 form a closed circuit, while the connector C6 is connected to the output control motor Md and the timer motor Mt and connected to each other. A voltage selection driving circuit of a microwave oven in which a power supply connector (Vs) of a 100V supply terminal (a) and a 220V supply terminal (C) are respectively connected to each power terminal of the motor (Mf).