MXPA99000457A - Microwave oven type of current alternate / current dire - Google Patents

Abstract

An AC / DC type microwave oven having the function of managing an input power source is described: the AC / DC type microwave oven comprises a rotatable inverter which inverts a DC power source into a source of energy. AC power by means of a rotating force, a high-voltage transformer that receives a common power source or an inverted AC power by the rotating inverter and produces a higher voltage, a magnetron that is driven by the high voltage produced from of the high-voltage transformer and radiates a microwave, and an energy control unit to detect a signal from a power selection switch, and prevent the AC and DC power sources from being powered simultaneously, thus avoiding that the AC power and DC power are supplied simultaneously to the microwave oven, which results in malfunction, or overload occurs in the electrical components of the microwave oven, therefore, only if you select an input power from the common power sources and DC, the microwave oven works properly, the remaining voltage of the battery is always detected and displayed through the media of deployment, thus preventing a complete discharge of the battery

Description

MICROWAVE OVEN TYPE OF CURRENT ALTERNATE / DIRECT CURRENT BACKGROUND OF THE INVENTION FIELD OF THE INVENTION The present invention relates to a microwave oven, which can be used with AC / DC power sources, and more particularly to an AC / DC type microwave oven which has the function of managing a power source of energy. entry .

DESCRIPTION OF THE PREVIOUS TECHNIQUE Generally, a microwave oven is a device used to cook food through the use of microwaves. The microwave oven is equipped with a high-voltage transformer and a magnetron. The high-voltage transformer serves to raise a common voltage of approximately 220V / 110V to a high voltage of around 2,000V to approximately 4,000V. The magnetron is powered by high voltage and microwave radiations of a desired frequency. Microwaves vibrate the moisture molecules contained within the food. Therefore, the food is cooked by the heat of friction generated by the vibration of the moisture molecules. Here, the high voltage transformer receives an AC voltage through an input part A thereon, and increases or decreases the AC input voltage proportional to a rotational ratio of a primary winding and a secondary winding thereof. The AC voltage that is increased or decreased, is fed to an output part of the transformer. Typically, the conventional microwave oven described above is designed to be powered by an AC power source. Figure 10 is a circuit diagram showing the conventional microwave oven using the AC power source. In Figure 1, a reference number 10 denotes a high voltage transformer, 11 is a primary coil, 12 is a first secondary coil, and 13 is a second coil secondary The primary coil 11 is wound on the input side of the high voltage transformer 10. The first and > second secondary coils 12 and 13 are wound on the output part of the high voltage transformer 10. The coil Primary 11 is connected to an AC power source. S 1 is an energy switch. The power switch S 1 is located on a connection cable that is arranged between the primary coil 11 and the AC power source, and connects or disconnects the primary coil 11 with the power source of the power source.

CA. A high voltage capacitor HVC, a high voltage diode HVD and a magnetron MGT, are connected to the output part of the transformer 10. The first secondary coil 12 preheats the magnetron MGT, and the second secondary coil 13 ^ increases the voltage provided by the AC power source up to a voltage of approximately 2000V. The second secondary coil 5 is connected to a magnetron by the high voltage capacitor HVC and the high voltage diode HVD. The high-voltage capacitor HVC and the high-voltage diode HVD are a voltage doubler which further increases the voltage raised by the second secondary coil 13 up to a voltage of approximately 4,000V. Magnetron MGT is powered by the 4000V voltage, and radiates a microwave of 2,450MHz. The operation of the conventional microwave oven described above is described below: if a user turns on the power switch S 1, the AC voltage is supplied to the high voltage transformer 10 by the power switch SW1. In the high voltage transformer 10, the AC input voltage is fed to > the primary coil 11 of the input part, and then induced to the first and second secondary coils 12 and 13 of the output part. The first secondary coil 12 preheats the magnetron MGT, and the second secondary coil 13 increases the input AC voltage fed to the input part of the primary coil 11 to approximately 2000V. The AC output voltage of approximately 2,000V, which is raised by The second secondary coil 13 is duplicated by the high voltage capacitor HVC and the high voltage diode HVD, and is then applied to the MGT magnetron. Therefore, the MGT magnetron is driven by the AC output voltage of approximately 4,000V, and radiates a microwave of 2,450MHz. The food contained within a cooking chamber (not shown) is cooked by the microwaves radiated by the MGT magnetron. However, since the conventional microwave oven is designed to be powered by the common 220V / 110V AC power source, there is a problem that the conventional microwave oven can not be used outdoors or on a ship, an airplane or any other vehicle. To overcome the above problem, another conventional microwave oven is proposed which, when the microwave oven is used in a place where there is no AC power source, an inverter using a separate semiconductor device can be connected to the oven microwave, in order to invest a DC power source in an AC power source, or the inverter is arranged in the microwave oven itself. Figure 2 is a circuit diagram of a conventional microwave oven, and Figure 3 is a circuit diagram of the inverter using a semiconductor device. In Figure 2, the construction of the part of the AC power source is the same as that of Figure 1, and in the part of the DC power source, the inverter 20 is disposed using a semiconductor device and a SW2 power switch. The inverter using a semiconductor device inverts the DC power source into the AC power source, and drives a high voltage transformer 10. A first primary coil 11 and a second primary coil 14 are wound on an input portion of the high voltage transformer 10. The first primary coil 11 receives the AC power source, and the second primary coil 14 receives_TLa. f AC power supply inverted by the inverter 20. In addition, a first secondary coil 12 and a second secondary coil 13 are wound on an output part of the high voltage transformer 10 together with a high voltage capacitor HVC, a high voltage diode. HDV voltage and a MGT magnetron. As shown in Figure 3, the inverter 20 using the semiconductor device comprises an activator circuit 1, a plurality of thi and th.2 thyristors and a capacitor Cl. The plurality of thyristors thl and th.2 is connected or disconnected by a switching operation of the activating circuit 1, and in turn a current in the second primary coil 14 of the high voltage transformer 10 is thus produced, thus generating the power source of AC having a desired voltage in the high voltage transformer 10. However, in this type of AC / DC microwave oven provided with the inverter using the semiconductor device, there is a problem. That is, since it is necessary to provide a plurality of expensive semiconductor devices for the inverter to produce a desired high voltage for the magnetron, the manufacturing cost is increased. In the conventional AC / DC microwave oven above, there is also the problem that the useful life of the battery supplying the DC power source is short, since the friction velocity of the current through the semiconductor device is very high. In the conventional AC / DC microwave oven 10 above, there is another problem that, since the semiconductor device ™ generates excessive heat, the energy loss due to heat is increased. In the above conventional AC / DC microwave oven, there is also the additional problem that, since As the size of the cooling fins increases to cool the semiconductor device, the size of the microwave oven also has to be increased. To overcome the previous problems, the applicant of the present invention has developed an improved CA / CD type microwave oven 20, and described in Korean Patent Application No. 98-18588, filed on May 22, 1998. In this microwave oven of improved CA / CD type, the manufacturing cost is reduced, the friction velocity of the current is reduced, the heat loss by heat is reduced also 25, the size of the microwave oven can be small, and the output frequency of the rotatable inverter can be controlled to remain constant, whereby the microwaves are also radiated stably. Accordingly, while the applicant has continuously improved the CA / CD type microwave oven, it is found that some 5 new technical requirements are necessary to use the microwave oven more conveniently, as described below: First, in the AC / DC type microwave oven described above, if the switches in ergy for AC power source and CD are connected simultaneously by ™ error, it is understood that the AC power and the DC power are supplied to the microwave oven, and that the latter is not put to work properly, or an overload is applied to the electrical parts thereof. Therefore, it is necessary to prevent the AC and DC power sources from being simultaneously fed to the microwave oven. Second, in case a battery is used as a DC power source for the AC / DC type microwave oven described above, it is understood that the operation of the microwave oven will be interrupted by the discharge of the battery , as long as the user does not carry it out.

Therefore, it is necessary to detect the voltage of the battery, and deploy it.

BRIEF DESCRIPTION OF THE INVENTION The present invention has been carried out to overcome the above problems and, consequently, a The objective of the present invention is to provide an AC / DC type microwave oven having the function of managing the input power source to prevent the AC and DC power sources from being simultaneously supplied to the microwave oven. Another object of the present invention is to provide a ™ AC / DC type microwave oven that has the function of managing the input power source to select only one of several power sources. Still another object of the present invention is to provide an AC / DC type microwave oven having the function of managing the input power source to detect the battery voltage, and deploying it. The above objective is achieved by the AC / DC type microwave oven having the function of managing the input power source according to the present invention, comprising a rotatable inverter which inverts a DC power source in an AC power source through a rotating force, a high-voltage transformer that receives a common power source or an AC power inverted by the rotating inverter and produces a higher voltage, a magnetron that is driven by the high voltage produced from the high-voltage transformer and radiates a microwave; and an energy control unit for detecting a signal from a power selection switch, and preventing the AC and DC power sources from being powered simultaneously. The power control unit comprises a first power selection switch for selecting a common power source (AC), a second power selection switch for selecting a CD power source, a first power relay for switching on or off the common power source with the high-voltage transformer, a second power relay for connecting or disconnecting the DC power source with the rotatable inverter, and a microcomputer for selectively connecting / disconnecting the first power relay or the second power relay. energy, corresponding to the input signal of the first power selection switch or the second power selection switch. The microcomputer prevents the operation of the first power relay and the second power relay, when the signals of the first power selection switch and the second power selection switch are fed to the microcomputer. The rotatable inverter comprises a motor that generates the rotating force, a commutator driven by the motor, and a plurality of brushes that are brought into contact, respectively, with the outer surface of the commutator. The commutator comprises a cylindrical body made of an insulating material, and conductive parts which are divided into equal numbers by non-conductive parts, respectively, having a desired width, whereby the two brushes which are adjacent to each other come into contact simultaneously with one side of the conductive parts. Each of the non-conductive parts has a width that is greater than one end of the brush, or that is equal to the end thereof. The second power relay connects or disconnects the DC power source with the motor and the brushes. A pair of brushes that are opposite each other are connected through the second relay energy with the CD power source, and the other pair of ^ Brushes that are opposite each other are connected to the high voltage transformer. The motor is connected in parallel with the pair of brushes that are connected through the second power relay to the DC power source. He second power relay is connected in parallel with a capacitor. Between the respective brushes, which are adjacent to each other, diodes are respectively connected to prevent a backward voltage flow. Another object of the present invention is achieved by means of the AC / DC type microwave oven according to the present invention, which has the function of managing the input power source, comprising a rotatable inverter that inverts a DC power source into a power source of AC by means of a rotating force, a high-voltage transformer that receives a common power source or inverted AC power by the inverter and produces a higher voltage, a magnetron that is driven by the high voltage produced from the high-voltage transformer and radiates a microwave, and an energy control unit for detecting the common power source and the CD power source and selecting only one power source. The power control unit comprises ua. The starting switch for operating the microwave oven, first energy sensing means for detecting the common power source, second energy sensing means for detecting the DC power source, a first power relay for switching on or off the common power source with the high-voltage transformer, a second power relay for connecting or disconnecting the DC power source with the rotatable inverter, and a microcomputer. If the first energy detecting means detects the common power source, and a signal from the starting switch is fed to the microcomputer, the microcomputer connects the first power relay, and if the second energy detecting means detects the source of power. DC power, and the signal of the starting switch is fed to the microcomputer, the microcomputer connects the second power relay. Furthermore, if the first and second energy detecting means respectively detect the common and DC power sources, and the signal of the starting switch is fed to the microcomputer, the microcomputer connects only the first power relay, whereby the Microwave oven is powered by the common power source. Yet another object of the present invention is achieved by the CA / CD type microwave oven, which has the function of managing the input power source in accordance with the present invention, comprising a rotatable inverter that inverts a source of energy. DC power in an AC power source by means of a rotating force, a high voltage transformer that receives a common power source or an inverted AC power by the rotating inverter and produces a higher voltage, a magnetron. which is powered by the high voltage produced from the high-voltage transformer and radiates a microwave, and a switch that is connected by a user to select only one power source from the common power sources and DC. If the switch is switched to the side of the common power source, the side of the CD power source is disconnected, and if the switch is switched to the side of the CD power source, the source side of common enexpia is disconnected Yet another object of the present invention is achieved by the CA / CD type microwave oven, which has the function of managing the input power source in accordance with the present invention, comprising a rotatable inverter that inverts a source of energy. DC power in an AC power source by means of a rotating force, a high-voltage transformer that receives a common power source or an inverted AC power by the rotating inverter and produces a higher voltage, a magnetron that is flfe powered by the high voltage produced from the high voltage transformer and radiates a microwave, and a 5 power control unit to detect the voltage of the CD power source and deploy it. The power control unit comprises voltage detecting means for detecting the DC power source and detecting a voltage value from the CD power source, and a microcomputer for display the value detected by the detection means of ^ voltage through the means of deployment. If the value detected by the voltage detecting means is less than a reference value, the operation of the microwave oven is stopped by the microcomputer. Therefore, in accordance with the present invention, it is avoided that the AC energy and the CD energy are simultaneously supplied to the microwave oven, which »Which results in a malfunction, or an overload occurs in the electrical components of the oven microwaves Since only if you select an input power from the common power sources and from CD, the microwave oven works properly. The remaining voltage of the battery is always detected and displayed through the deployment means, thus preventing a complete discharge of the battery. the battery.

BRIEF DESCRIPTION OF THE DRAWINGS The above objects and advantages will be more apparent from the description of the present invention in relation to the drawings accompanied by references, in which: Figure 1 is a circuit diagram of a conventional CA type microwave oven; Figure 2 is a circuit diagram of another conventional CA / DC type microwave oven; Figure 3 is a circuit diagram of the inverter used in the CA / CD type microwave oven of 71a Figure 2; Figure 4 is a block diagram of the CA / CD type microwave oven, which has the function of handling an energy input source in accordance with the first preferred embodiment of the present invention; Figure 5 is a circuit diagram of the main part of the CA / CD type microwave oven of Figure 4; Figures 6 and 7 are views showing the operations of how the DC current is inverted in an AC current in accordance with the present invention; Figure 8 is a block diagram showing the second preferred embodiment of the present invention; Figure 9 is a block diagram showing the third preferred embodiment of the present invention; and Figure 10 is a block diagram showing the fourth preferred embodiment of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED MODALITY Figure 4 is a block diagram of an AC / DC type microwave oven having the function of managing an input power source in accordance with the first preferred embodiment of the present invention. Figure 5 is a m • ^ circuit diagram of a main part of the CA / CD type microwave oven of the figure. In Figure 4, a reference number 100 denotes a rotatable inverter, 110 is a motor, 121 to 124 are brushes, 130 is a switch, 200 is a high-voltage transformer, 300 is an energy control unit, and MGT is a magnetron. The rotatable inverter 100 comprises the switch 130, the brushes 121, 122, 123, 124, and the motor 110. Each of the brushes 121, 122, 123, 124 is in contact with the outer surface of the switch 200. The switch 200 is rotated by the motor 110. The rotatable inverter 100 inverts a DC power source into an AC power source by rotating the switch 130. The high-voltage transformer 200 receives a common energy source or source of AC power inverted by the rotatable inverter 100, and produces a desired high voltage. Magnetron MGT is powered by the high voltage produced from the high-voltage transformer 200, and radiates a microwave. The power control unit 300 detects a signal from a power selection switch, and prevents the AC and DC power sources from being powered simultaneously to the microwave oven. The power control unit 300 comprises a first power selection switch 310 for selecting a common power source (CA), a second power selection switch 320 for selecting a CD power source, a first power relay power 330 to connect or disconnect the power source common with the high voltage transformer 200, a second power relay 350 for connecting or disconnecting the DC power source with the rotatable inverter 100, and a microcomputer 340 for selectively connecting / disconnecting the first relay energy 330 or the second energy relay 350, corresponding to the input signal of the first selection switch of ^ 310 energy or the second power selection switch 320. Here, if the signals of the first power selection switch 310 and the second power switch are fed. energy selection 320, the microcomputer avoids the operations of the first power relay 330 and the second power relay 350. In figure 5, the high voltage transformer 200 comprises a first primary coil 201, a second coil primary 202, a first secondary coil 211 and a second secondary coil 212. Here, the first and second primary coils 201 and 202 are wound on an inlet part, and the first and second secondary coils 211 and 212 are flfc wound on an Departure part. The source of "common AC" power is fed to the first primary coil 201, and the AC power inverted by the rotatable inverter 100 is fed to the second primary coil 202. The common AC power source is powered to through a contact RYS1 of the first power relay 330 330 to the first primary coil 201 of the high voltage transformer 200. The power source of CD is supplied through a contact RYS2 of the second ^ power relay 350 to rotary inverter 100. The rotatable inverter -100 comprises switch 130, brushes 121, 122, 123, 124, and motor 110. Each of the brushes 121, 122, 123, 124 is in contact with the outer surface of the switch 130. Switch 130 is rotated by motor 110. Here, a pair of brushes 121 and 123 which are opposite each other are connected to the CD power source, and the other pair of brushes 122 and 124 which are opposite each other are connected to the second primary coil 202 of the high-voltage transformer 200. Each of the diodes DI, D2, D3, D4 which prevent a backward voltage, is connected respectively between the respective brushes 121, 122, 123, 124, which are adjacent to each other. The motor 110 is connected to the CD power source in parallel with the torque of brushes 121 and 123. Therefore, when the contact RYS2 of the second power relay 350 is connected, the DC power source is supplied to the brushes 121 and 123 and the motor 110. A capacitor C2 is connected in parallel with the ^ contact RYS2 of the second power relay 350. The switch 130 comprises a cylindrical body 131 and conductive portions 132 5 that are formed on the outer surface of the cylindrical body 131. The conductive portions 133 are respectively divided into equal numbers by non-conductive portions 133 having a predetermined width, and respectively connected with the two brushes that are adjacent between yes. Meanwhile, it is preferable that each of the parties does not Conductors have a width that is greater than one end of the brush, or that is equal to the end thereof. The HVC high-voltage capacitor, the HVD high-voltage diode and the MGT magnetron are connected to the first coil secondary 211 and the second secondary coil 212 of the high voltage transformer 200. The construction and operation thereof are the same as those of the prior art, so that a detailed explanation thereof is omitted. Figures 6 and 7 are views showing the operations of how the DC current is inverted in an AC current in accordance with the present invention. As shown in Figure 6, a current is fed from a positive terminal of the DC power source to the upper brush 121, and flows through the conductive part 132 of the switch 132 and the left brush 122 from a lower portion of the second primary coil 202 towards an upper portion of the second primary coil 202. In addition, the current is fed to the right brush 124 and circulated through of the conductive part 132 and the lower brush 123 towards a negative terminal of the CD power source. In Figure 7, the current is fed from the positive terminal of the DC power source to the upper brush 121, and flows through the conductive part 132 of the switch 130 and the right brush 124 of the upper portion 71- of the second primary coil 202 towards the lower portion of the second primary coil 202, while the switch 130 is rotated to a desired angle, for example, at 90 degrees. In addition, the current is fed to the left brush 122 and a negative terminal of the DC power source is circulated through the conductive part 132 and the lower brush 123 Thacia. The operation of the CA / CD type microwave oven, which has the function of handling an input power source and as previously constructed in accordance with the first embodiment of the present invention, will be explained in detail by means of FIGS. 9 companions. In the operation by the CD power source, when the second power selection switch 320 is connected by a user, the microcomputer 340 detects the signal of the second power selection switch 320, and establishes the contact RYS2 of the second power relay. 350 energy Thus, the DC power source of 12V or 24V of the BATT battery is supplied through the contact RYS2 of the second power relay 350 to the motor 110 and the upper brush 121. The capacitor C2, which is connected in parallel with the contact RYS2 of the second power relay, charges or discharges a voltage, so that the motor 110 can be rotated evenly in an initial operation. The switch 130 is rotated by the motor 110. Therefore, the conductive parts 132 are in turn in contact with the respective brushes 121, 122, 123, 124, whereupon the DC power source is inverted in a AC power source. That is, the DC power source current supplied from the positive terminal of the BATT battery is fed through the upper brush 121 in FIG. 6 to the switch 130. The current thus flows through the conductive part 132 to the left brush 122, and is fed from the lower portion of the second primary coil 202 of the high voltage transformer 200 to the upper part thereof. And then, the current is circulated through the right brush 124, the conductive part 132 and the lower brush 123 towards the negative terminal of the BATT battery. The DC power source supplied from the positive terminal of the BATT battery is fed through the upper brush 121, the conductive part 132 and the right brush 124 from the upper portion of the second primary coil 202 towards the lower portion of the same, while the switch 130 is rotated at a desired angle, for example, at 90 degrees, as shown in figure 7. After that, the current is made to circulate through the left brush 122, the conductive part 132 and the lower brush 123 to a terminal negative battery. Therefore, in any rotation (360 degrees) of the switch 130 by the motor 110, the direction of the current in the second primary coil 202 of the high-voltage transformer 200 is thus modified twice up and down, thus generating the AC power of i 10 a desired frequency. The transformer 200 induces the AC power supplied to the second primary coil 202 in the first and second secondary windings 211 and 212. The first secondary winding 211 preheats the magnetron MGT, and the second secondary winding 212 increases the power fed to approximately 2,000V proportional to a rotation ratio. The high energy is further increased through the ^ HVC high-voltage capacitor and HVD high-voltage diode up to approximately 4,000V, and then supplied to the MGT magnetron. Therefore, 2,450MHz microwaves are generated from the magnetron, and the food in the cooking chamber (not shown) is fired by microwaves. In the operation by the common 110V / 220V power source, when the power selection switch is connected by a user, the microcomputer 340 detects the Signal of the first power selection switch 310, and establishes the contact RYS1 of the first energy relay 330. Thus, the common power source of an energy code is supplied through the contact RYS1 of the first power relay 330 to the high voltage transformer 200. The transformer 200 induces the common power supplied to the first primary coil 201 in the first and second secondary coils 211 and 212. The first secondary coil 211 preheats the magnetron MGT, and the second secondary coil 212 increases the energy fed to the first primary coil 201 to approximately 2,000V proportional to a ratio of turn. The high energy is further increased through the ^ HVC high-voltage capacitor and HVD high-voltage diode up to approximately 4,000V, and then supplied to the MGT magnetron. Therefore, the 2,450MHz microwaves are generated from the magnetron, and the food in the chamber cooking (not shown) is cooked by microwaves. Meanwhile, if the first and second power switches 310 and 320 are connected simultaneously by mistake, the microcomputer 340 detects the signals of the first and second power switches 310 and 320, and prevents the operations of the first power relay 330 and second power relay 350, thus preventing the AC and DC power sources from being simultaneously fed into the microwave oven. Figure 8 is a block diagram showing the second preferred embodiment of the present invention. In the Figure 8, the construction and operation of the motor 110, the rotatable inverter 100, the high voltage transformer 200, and the magnetron MGT, are the same as those of the first embodiment of the present invention. Here, the rotatable inverter 100 is provided with the brushes 121, 122, 123, 124, and the switch 130. The transformer 200 has the first and second primary coils 201, 202, and the first and second secondary coils 211, 212 However, the microwave oven according to the second preferred embodiment of the present invention further comprises an energy control unit 400 for detecting the common energy source and the energy source of the energy source.

CDs and select only one power source. The unit of ^^ energy control 400 comprises a starting switch 410, first energy detection means 450, second energy sensing means 460, a first energy relay 430, a second energy relay 440, and a microcomputer 420. start switch 410 drives the microwave oven. The first energy detecting means 450 detects the common power source, and the second energy detecting means 460 detects the DC power source. The first power relay 430 connects or disconnects the common power source with the high voltage transformer 200, and the second power relay 440 connect or disconnect the DC power source with the rotatable inverter 100. If the first energy detecting means 450 detect the common power source, and a signal from the starting switch 410 is fed to the microcomputer 420, the microcomputer 420 connects the first power relay 430. If the second energy detecting means 460 detects the DC power source, and the signal of the breaker 410 is fed to the microcomputer «420, the microcomputer 420 connects the second power relay. In addition, if the first and second power detection means 450 and 460 respectively detect the common and DC power sources, and the signal of the breaker 410 is fed to the microcomputer. 420, the microcomputer 420 connects only the first energy relay 430, whereby the microwave oven is operated by the common power source. Therefore, the microcomputer 420 ™ detects the common and CD power sources with the first and second energy sensing means 450 and 460, and controls the first and second power relays 430 and 440 to prevent common and DC power sources from being powered simultaneously to the high voltage transformer 200. Figure 9 is a block diagram showing the third preferred embodiment of the present invention. In Figure 9, the construction and operation of the motor 110, the rotatable inverter 100, the high voltage transformer 200, and The magnetron MGT are the same as in the first embodiment of the present invention, as shown in FIG. 4. However, the microwave oven according to the third preferred embodiment of the present invention further comprises a switch S 10. Switch SW10 is switched by a user, thus selecting only one power source from the common power sources and from CD. That is, if the switch S 10 is - switched to the side of the common power source, the side of the CD power source is disconnected. If the switch S 10 is switched to the side of the DC power source, the side of the common power source is switched off, thus preventing the common and DC power sources from being simultaneously fed to the high voltage transformer 200. Figure 10 is a block diagram showing the fourth preferred embodiment of the present invention. In Figure 10, the construction and operation of the motor 110, the rotatable inverter 100, the high voltage transformer 200, and the magnetron MGT, are the same as those of the first embodiment of the present invention, as shown in the figure 4. However, the microwave oven according to the fourth preferred embodiment of the present invention further comprises an energy control unit 500 for detecting a voltage of the DC power source, and deploying it. The power control unit 500 comprises voltage sensing means 510, a microcomputer 520, deployment means 530 and a power relay 540. The voltage sensing means 510 detects the DC power source, and then detects the value of the voltage of the CD power source. The microcomputer 520 displays the value detected by the voltage sensing means 510 through the deployment means 530. Furthermore, if the value detected by the voltage detecting means 510 is smaller than the reference value, the power relay 540 is disconnected by the microcomputer 520, so that the operation of the microwave oven is stopped. Therefore, the user can obtain the remaining voltage of the battery, thus avoiding the complete discharge of the same. In accordance with the AC / DC type microwave oven of the present invention, it is avoided that the AC energy and DC energy are simultaneously supplied to the microwave oven, which gives a malfunction, or a overload on the electrical components of the same. In addition, in accordance with the CA / DC type microwave oven of the present invention, only one input energy from the common power sources and DC is selected, whereby the microwave oven operates efficiently. In addition, in accordance with the CA / CD type microwave oven of the present invention, the remaining voltage of the battery is always detected and displayed through the > means of deployment, thus avoiding a complete discharge of the battery. While the present invention has been shown and described particularly in relation to the preferred embodiment thereof, it will be understood by those skilled in the art that various changes in form and detail may be made herein without departing from the spirit and scope of the invention. invention, defined by the appended claims.

Claims (16)

NOVELTY OF THE INVENTION CLAIMS

1. An AC / DC type microwave oven, characterized in that it comprises: a rotatable inverter that inverts a DC power source in an AC power source by means of a rotating force; a high-voltage transformer that receives a common power source or a 10 AC power inverted by the inverter rotatable and produces a ™ higher voltage; a magnetron that is powered by the high voltage produced from the high-voltage transformer and radiates a microwave; and an energy control unit for detecting a signal from a selection switch of 15 energy, and prevent the AC and DC power sources from being powered simultaneously.

2. - An AC / DC microwave oven in compliance > with claim 1, further characterized in that the energy control unit comprises a first switch of 20 energy selection to select a common power source (CA); a second power selection switch for selecting a CD power source; a first power relay for connecting or disconnecting the common power source with the high voltage transformer; a second relay 25 power to connect or disconnect the DC power source with the rotating inverter; and a microcomputer for selectively connecting / disconnecting the first power relay or the second power relay, corresponding to the input signal of the first power selection switch or the second power selection switch.

3. An AC / DC microwave oven according to claim 2, further characterized in that the microcomputer prevents the operation of the first power relay and the second power relay, when the signals of the first power selection switch and the second switch 10 energy selection are fed to the microcomputer. W

4. - An AC / DC microwave oven according to claim 2, further characterized in that the rotatable inverter comprises a motor that generates the rotating force, a commutator driven by the motor, and a A plurality of brushes are brought into contact, respectively, with the outer surface of the commutator.

5. - An AC / DC microwave oven according to claim 4, further characterized in that the commutator comprises a cylindrical body made of a material 20 insulators, and conductive parts that are divided into equal numbers by non-conductive parts, respectively, having a desired width, whereby the two brushes that are adjacent to one another come into contact simultaneously with one side of the conductive parts.

6. An AC / DC microwave oven according to claim 5, further characterized in that each of the non-conductive parts has a width that is greater than one end of the brush, or that is equal to the end of the same

7. - An AC / DC microwave oven according to claim 4, further characterized in that the second power relay connects or disconnects the DC power source with the motor and the brushes.

8. - An AC / DC microwave oven according to claim 7, further characterized in that a pair of brushes that are opposite each other are connected through the second power relay with the DC power source, and • the other pair of brushes that are opposite each other are connected to the high voltage transformer.

9. - An AC / DC microwave oven according to claim 8, further characterized in that the motor 15 is connected in parallel with the pair of brushes that are connected through the second power relay to the CD power source . ^

10. - An AC / DC microwave oven according to claim 7, further characterized in that the second power relay is connected in parallel with a capacitor.

11. An AC / DC microwave oven according to claim 4, further characterized in that the respective brushes, which are adjacent to each other, are respectively connected with diodes to prevent a voltage flow backward.

12. An AC / DC type microwave oven, characterized in that it comprises: a rotatable inverter that inverts a DC power source into an AC power source by means of a rotating force; a high-voltage transformer that receives a common power source or an AC power inverted by the rotating inverter and produces a higher voltage; a magnetron that is powered by the high voltage produced from the high-voltage transformer and radiates a microwave; and an energy control unit to detect the common power source and the power source of 10 CDs and select only one power source. ™

13. - An AC / DC microwave oven according to claim 12, further characterized in that the power control unit comprises a start switch for driving the microwave oven, first detection means 15 power to detect the common power source, second means of energy detection to detect the DC power source, a first power relay to connect or disconnect the common power source with the high voltage transformer, a second relay of energy to connect or 20 disconnecting the DC power source with the rotatable inverter, and a microcomputer, wherein if the first energy detection means detect the common power source, and a signal from the starting switch is fed to the microcomputer, the microcomputer connects the first relay 25 energy, and if the second energy detection means detect the DC power source, and the signal of the starting switch is fed to the microcomputer, the microcomputer connects the second power relay. ^

14. - An AC / DC microwave oven according to claim 13, further characterized in that if the first and second energy sensing means respectively detect the common and DC power sources, and the signal of the switch of starting is fed to the microcomputer, the microcomputer connects only the first power relay, with which the microwave oven is 10 powered by the common power source.

15. An AC / DC type microwave oven, characterized in that it comprises: a rotatable inverter that inverts a DC power source in an AC power source by means of a rotating force; a transformer 15 high voltage that receives a common power source or inverted AC power by the rotating inverter and produces a higher voltage; a magnetron that is powered by the high ^ voltage produced from the high-voltage transformer and radiates a microwave; and a switch that is connected by a 20 user to select only one power source from common power sources and DC.

16. An AC / DC microwave oven according to claim 15, further characterized in that if the switch is switched to the side of the common power source, 25 the side of the CD power source is disconnected, and if the switch is switched to the side of the CD power source, the side of the common power source is disconnected. 17.- An AC / DC type microwave oven, ^ characterized in that it comprises: a rotatable inverter that inverts a DC power source into a power source 5 CA by means of a rotating force; a high-voltage transformer that receives a common power source or an inverted AC power by the rotating inverter and produces a higher voltage; a magnetron that is powered by the high voltage produced from the high-voltage transformer and 10 radiates a microwave; and an energy control unit for ™ Detect the voltage of the CD power source and deploy it. 18. - An AC / DC microwave oven according to claim 17, further characterized in that the unit 15 energy control comprises voltage detecting means for detecting the DC power source and detecting a value of the voltage of the DC power source, and a microcomputer for displaying the value detected by the voltage detecting means through of the means of 20 deployment. 19. - An AC / DC microwave oven according to claim 18, further characterized in that if the value detected by the voltage detecting means is less than a reference value, the operation of the 25 microwave is stopped by the microcomputer.