KR20000003706A - Fuse circuit of electronic range for high voltage - Google Patents

Abstract

A fuse circuit of a high power microwave oven is disclosed. The present invention provides a high output electronic device having a plurality of closed circuits whose one end of the input side is connected in parallel through each commercial AC line, and a high voltage transformer is connected to the other end via each door switch, monitor switch and load circuit. A range fuse circuit comprising: a fuse connected to an input common primary end of each commercial alternating line and simultaneously blocking current flowing through the plurality of closed circuits; and an input common secondary end of each commercial alternating line. And other fuses that are connected so as to block current flowing through the load circuit and the high voltage transformer at a later stage thereof. Preferably, the fuse sets a capacity sufficient to accommodate the amount of current flowing through the plurality of closed circuits simultaneously, and the other fuse sets a capacity corresponding to 1/2 of the fuse. Therefore, since the plurality of fuses in the plurality of closed circuits complement or mutually perform the overcurrent blocking action, the overcurrent can be blocked more effectively by excluding the malfunctioning factor due to the operation mismatch between the different closed circuits.

Description

High Power Microwave Fuse Circuit

The present invention relates to a high-power microwave fuse circuit, and more particularly, to a high-power microwave fuse circuit for performing a plurality of fuses complementary or common action in the plurality of closed circuits to perform an efficient overcurrent blocking.

In general, a microwave oven is a device for heating / cooking food using microwaves, and includes a general high voltage transformer and a magnetron, and the high voltage transformer generates a high voltage to generate a magnetron. The magnetron emits high frequency (approximately 2450 MHz) microwaves in a confined space where food is stored. Microwaves emitted in this way vibrate the water molecules contained in the food, molecular friction heat is generated in accordance with the vibration of the water molecules is to heat / cook food.

On the other hand, in recent years, a high power / large capacity microwave oven is required in convenience stores and various offices, etc. As a result, high power microwave ovens having a plurality of high voltage transformers and magnetrons are widely used.

1 is a control block diagram illustrating such a conventional high power microwave fuse circuit.

Accordingly, the first and second commercial AC lines L1 and L2 input normal commercial AC power supplies 110V or 220V through one end thereof, and the other end thereof is the first high voltage transformer HVT1 primary. It is connected to both ends of the coil to form a closed circuit. Here, a fuse FUSE1, a door switch SW1, and a monitor switch SW3 are connected in series to the first commercial AC line L1, and a relay RY1 is connected to the second commercial AC line L2. Connected.

In addition, a low pressure transformer LVT and a temperature sensor TCO1 TCO2 are provided between the first and second commercial exchange lines L1 and L2 at the rear end of the fuse FUSE1, and the low pressure transformer LVT On the secondary coil side, there is provided a load circuit 1 equipped with a lamp, a fan motor, a timer, and the like, which are not shown.

The fuse FUSE1 blocks the overcurrent of the load circuit 1 and the high voltage transformer HVT1, and the door switch SW1 and the monitor switch SW3 are turned on / off according to the opening / closing state of a door (not shown). The safety function when driving the microwave is performed.

Further, on the input side, third and fourth commercial exchange lines L3 and L4 connected in parallel with the first and second commercial exchange lines L1 and L2 are provided, and the third and fourth commercial exchange lines are provided. L3 and L4 are connected to both ends of the primary coil of the second high voltage transformer HVT2 to form another closed circuit. A fuse FUSE2, a door switch SW2 and a monitor switch SW4 are connected in series to the third phase alternating line L3, and a relay RY2 is connected to the fourth phase alternating line L4. , Each operation is the same as the above-described fuse FUSE1, door switch SW1, monitor switch SW3 and relay RY1.

Also, on the secondary coil side of each of the high voltage transformers HVT1 and HVT2, a high voltage capacitor HVC1, HVC2, a high voltage diode HVD1, HVD2, and a magnetron MTG1, MGT2 for generating microwaves are provided. Each is prepared.

The relays RY1 and RY2 are turned on and off by a microcomputer and a relay driving unit (not shown) to supply the commercial AC power source AC to the load circuit 1 of the microwave oven and each of the high voltage transformers HVT1 and HVT2. Is authorized.

Looking at the operation of the conventional high-power microwave fuse circuit configured as described above, when the relay (RY1) (RY2) is turned on by the control of the microcomputer and the relay driver (not shown), the first and second commercial AC (L1) ( A commercial AC power source AC is applied to the third and fourth commercial AC lines L3 and L4 together with L2) to operate the illustrated load circuit 1, and to control the respective high voltage transformers HVT1 and HVT2. AC power is also applied to the primary coil side.

Accordingly, each of the high voltage transformers HVT1 and HVT2 outputs a high voltage through the secondary coil to drive the plurality of magnetrons MGT1 and MGT2, and the microwaves emitted from the magnetrons MTG1 and MGT2. Food is heated / cooked.

In addition, when an overcurrent occurs due to the load circuit 1 and each of the high voltage transformers HVT1 and HVT2, each fuse FUSE1 corresponding to each closed circuit is melted to cut off the overcurrent.

However, the conventional high-power microwave fuse circuit operated in this manner is assumed to be the third and fourth commercial alternating lines L3 and L4 when only one fuse FUSE2 is melted due to the occurrence of overcurrent. The current of the closed circuit can be interrupted, but the current of the other closed circuits of the first and second phase alternating lines (L1) and L2 cannot be blocked, so that the fuse of the first commercial alternating line (L1) is generated even when an overcurrent occurs. Through FUSE1, the load circuit 1 and the high voltage transformer HVT1 continue to operate. Therefore, a malfunction occurs in which operation is inconsistent between different closed circuits, and thus there is a problem in that the overcurrent cannot be effectively blocked.

Accordingly, an object of the present invention is to solve the problems of the prior art as described above, a high-power microwave fuse for a plurality of fuses in a plurality of closed circuits complementary or common action to perform an efficient over-current blocking In providing a circuit.

1 is a control circuit diagram showing a conventional high-power microwave fuse circuit;

Figure 2 is a control circuit diagram showing a preferred embodiment of a high power microwave fuse circuit according to the present invention.

Explanation of symbols on the main parts of the drawings

1: Load circuit FUSE10, FUSE20: Fuse

C1, C2: common stage L1 to L4: commercial exchange line

TCO1, TCO2: Temperature sensor LVT: Low voltage transformer

SW1, SW2: Door switch SW3, SW4: Monitor switch

HVT1, HVT2: High voltage transformer MGT1, MGT2: Magnetron

HVC1, HVC2: High Voltage Capacitor HVD1, HVD2: High Voltage Diode

RY1, RY2: relay

A feature of the high-power microwave fuse circuit according to the present invention for achieving this object is that one end of the input side is connected in parallel through each commercial AC line, and through each door switch, monitor switch and load circuit. A high-power microwave fuse circuit having a plurality of closed circuits having a high voltage transformer connected to the other end thereof, the high-frequency microwave fuse circuit being connected to an input common primary end of each of the commercial AC lines to simultaneously block currents flowing through the plurality of closed circuits. A fuse and another fuse connected to an input common secondary end of each of the commercial alternating lines to block current flowing through the load circuit and the high voltage transformer at a later stage thereof.

Preferably, the fuse sets a capacity sufficient to accommodate the amount of current flowing through the plurality of closed circuits simultaneously, and the other fuse sets a capacity corresponding to 1/2 of the fuse.

Therefore, the plurality of fuses in the plurality of closed circuits complement each other or in common to perform an efficient overcurrent blocking, and thus, the overcurrent can be more effectively blocked by excluding a malfunction factor due to an operation mismatch between different closed circuits.

Hereinafter, with reference to the accompanying drawings will be described in detail a preferred embodiment of a high-power microwave fuse circuit according to the present invention, the same components as in the prior art will be described by applying the same reference numerals.

Figure 2 is a control block diagram showing a preferred embodiment of a high power microwave fuse circuit according to the present invention.

According to this, the first and second commercial AC lines L1 and L2 input normal commercial AC power supplies 110V or 220V through one end of the input side, and the other end thereof is the first high voltage transformer HVT1 1. It is connected to both ends of the secondary coil. In addition, one end of the third and fourth commercial AC lines L3 and L4 is connected to the first and second commercial AC lines L1 and L2 so as to input a normal AC power supply 110V or 220V. It is connected in parallel with the input side, and the other end thereof is connected to both ends of the second high voltage transformer (HVT2) primary coil.

Here, the first and second commercial AC lines L1 and L2 and the third common AC line L1 and the third commercial AC line L3 are connected to each other. And a fuse FUSE10 for simultaneously blocking currents flowing in the plurality of closed circuits configured by the fourth commercial AC line L3 and L4.

In addition, a door switch SW1 (SW2) and a monitor switch SW3 (SW4) are connected in series to the first commercial AC line L1 and the third commercial AC line L3, and the second commercial AC line The relays RY1 and RY2 are connected to the L2 and the fourth phase alternating lines L4. In addition, a low voltage transformer (LVT) and a temperature sensor (TCO1) (TCO2) are provided between the first and second commercial AC lines (L1) and (L2) behind the primary common stage (C1), and the low voltage transformer (TCO2) is provided. On the secondary coil side of the LVT, there is provided a load circuit 1 equipped with a lamp, a fan motor, a timer, and the like, not shown.

In addition, the secondary common terminal C2 after the primary common terminal C1 blocks the current flowing through the high voltage transformer HVT2 together with the low voltage transformer LVT and the load circuit 1 at the rear stage thereof. Another fuse FUSE20 is provided.

Here, the fuse (FUSE10) is set to a capacity sufficient to accommodate the amount of current flowing in the plurality of closed circuits at the same time, the other fuse (FUSE20) to set the capacity corresponding to 1/2 times the fuse (FUSE10) It is preferable.

Also, on the secondary coil side of each of the high voltage transformers HVT1 and HVT2, a high voltage capacitor HVC1, HVC2, a high voltage diode HVD1, HVD2, and a magnetron MTG1, MGT2 for generating microwaves are provided. Each is prepared. The relays RY1 and RY2 are turned on and off by a microcomputer and a relay driving unit (not shown) to supply the commercial AC power source AC to the load circuit 1 of the microwave oven and each of the high voltage transformers HVT1 and HVT2. Is authorized.

If described in more detail the action of the preferred embodiment according to the present invention configured as follows.

First, when the relays RY1 and RY2 are turned on by the control of the microcomputer and the relay driver, which are not shown, the third and fourth commercial exchange lines L3 together with the first and second commercial exchange lines L1 and L2. A commercial AC power source AC is applied to the L4 to operate the illustrated load circuit 1, and an AC power source AC is also applied to the primary coil side of each of the high voltage transformers HVT1 and HVT2.

Accordingly, each of the high voltage transformers HVT1 and HVT2 outputs a high voltage through the secondary coil to drive the plurality of magnetrons MGT1 and MGT2, and the microwaves emitted from the magnetrons MGT1 and MGT2. The food is heated / cooked by the same as described above through the prior art.

In the state where the high-power microwave is driven as described above, when overcurrent occurs in one closed circuit or all closed circuits by the load circuit 1 and each of the high voltage transformers HVT1 and HVT2, the primary common stage C1. The fuse FUSE10 is a closed circuit consisting of the load circuit 1 through the low voltage transformer LVT and the respective high voltage transformers HVT1 and HVT2, that is, the first and second commercial AC lines L1 and L2. It is melted by the overcurrent of all the loads through the closed circuit and other closed circuits of the third and fourth commercial AC lines L3 and L4 to cut off the current.

In addition, another fuse FUSE20 of the secondary common terminal C2 is also melted by an overcurrent such as the load circuit 1 and the high voltage transformer HVT2 through the low voltage transformer LVT, and cuts off the current.

Accordingly, even if only one fuse FUSE10 or FUSE20 of the plurality of fuses FUSE10 or FUSE20 is melted, the currents of all closed circuits are blocked so that the respective fuses FUSE10 and FUSE20 are complementary or common to each other. As a result, an efficient overcurrent blocking function can be performed. Accordingly, the overcurrent can be blocked more effectively by excluding a malfunction factor due to an operation mismatch between different closed circuits.

The present invention is not limited to the above-described specific preferred embodiments, and various modifications can be made by any person having ordinary skill in the art without departing from the gist of the present invention claimed in the claims. Of course, such changes are intended to fall within the scope of the claims set forth.

As described above, according to the high-power microwave fuse circuit according to the present invention, a plurality of fuses in the plurality of closed circuits complement or common to each other to perform an efficient over-current blocking, operation mismatch between different closed circuits It is possible to cut off the overcurrent more effectively by excluding the malfunction factor according to the.

Claims (2)

One end of the input side is connected to each other in parallel through a commercial line, and a high output microwave fuse circuit having a plurality of closed circuits connected to the other end via a door switch, a monitor switch and a load circuit. In A fuse connected to an input common primary end of each of the commercial AC lines to simultaneously block currents flowing in the plurality of closed circuits; And And a second fuse connected to an input common secondary end of each of the commercial alternating lines so as to cut off a current flowing in the load circuit and the high voltage transformer at a later stage thereof. 2. The high output power according to claim 1, wherein the fuse sets a capacity sufficient to accommodate the amount of current flowing in the plurality of closed circuits simultaneously, and the other fuse sets a capacity corresponding to 1/2 of the fuse. Microwave fuse fuse circuit.