CN2568085Y - Induction heating electric rice cooker - Google Patents

Abstract

The utility model relates to an induction heating electric rice cooker which comprises a container (3) which can carry out heating through an alternating magnetic field, wherein the container (3) is provided with a resonance circuit (8), and the resonance circuit (8) comprises a heating coil (4) enabling the electric rice cooker to carry out heating and a resonant capacitor C1. The resonance circuit can supply a power supply after the resonance circuit is filtered by a choke coil L and a bridging capacitor C2. Because current and the power supply which are filtered by the choke coil L and the bridging capacitor C2 and are stable all the time are added on the induction heating coil (4), under the condition that the resonance circuit 8 can not affect the induction heating coil (4), the proper reaction can be carried out by the frequency converting control which is not later than the wide range of a power transistor unit of a frequency converting circuit, etc. or units ON and OFF, the water absorption heating of the water absorption engineering needed by a wide control range, the rice cooking heating needed by the rice cooking engineering, and the rice steaming heating of the rice steaming engineering can be carried out according to the preset program, and then the delicious and tasty rice can be cooked.

Description

The induction heating electric cooker

1, technical field:

The utility model is a kind of electric cooker, particularly a kind of relevant electric cooker that utilizes the induction heating of inductive electromagnetic.

2, background technology:

On the mode of heating of cooking of the general electric rice cooker that passes through heater heats, realize best heated condition: the incipient stage is heating little by little, interstage is adopted big firepower heating, in this state, the initial stage of cooking is adopted suction engineering the best heated condition that draws water, and the water of cooking effectively and equably is absorbed, then with the best well-done heated condition of the engineering of cooking, and the best heated condition that boils the steamed rice engineering heating after meter heated condition heats, to reach best heated condition.Yet in this heating control model, the heating control range of cooking that becomes controlling object becomes maximum, if when being applied to the cooking of induction heating mode, induction adds the coil resonance current that can only circulate, and can not comprise the temperature control electric power control of the engineering of cooking flexibly.

3, summary of the invention:

The utility model is for overcoming above-mentioned shortcoming, and a kind of broad range such as steamed rice heating of suction heating, the necessary Mi Jiare of boiling of the engineering of cooking and steamed rice engineering of the necessary suction engineering of can the cooking temperature controlled induction heating electric cooker of cooking is provided.

For achieving the above object, electric cooker has been equipped with the container by the alternating magnetic field heating, has resonant circuit, and this resonant circuit comprises the heater coil that makes the container heating, by the power supply of choking-winding and the above-mentioned resonant circuit of bridging condenser filtering.

In the said structure of the present utility model, be fed to the power supply of resonant circuit, in practicality, be fit to rectification and use source power supply, even rectification circuit voltage is by full-wave rectification, it still is pulsating current, be necessary for big capacity owing to be fed to the electric current and the voltage of heated object again, therefore can not obtain stable resonance.But carry out filtering by choking-winding and bridging condenser owing to be applied to the electric current and the power supply of resonant circuit, on induction coil, continue to add stable electric current and voltage, resonant circuit is not induction heated the influence of coil, can not be later than unit or switch ON such as power transistor, the variable frequency control of OFF means broad range, carry out appropriate reaction, can carry out the suction heating of the suction engineering of cooking that needs extensive control range according to predefined program, boil the necessary heating of cooking of meter engineering, and the steamed rice of steamed rice engineering heating, and can burn appetizing rice.

4, description of drawings:

Fig. 1 is an embodiment constructed profile of the present utility model;

Fig. 2 is Fig. 1 embodiment circuit diagram;

5, embodiment:

The utility model is as shown in Figure 1: comprise that shell 1, its inside are provided with the outer pot 2 that can place container 3, shelve on the shell 1 container 3 upper edges, below the inside of shell 1, is provided with the induction coil 4 that produces the magnetic line of force on support disc 5.In the central authorities of support disc, be provided with the temperature detector 6 that detects the electric cooker temperature with thermistor equitemperature transducer.

Below induction coil, be provided with the resonant circuit 8 of driving frequency changer circuit 7 shown in Figure 2, and possesses the control circuit of controlling this frequency changer circuit 7 according to the temperature of container 3, resonant circuit 8 comprises resonant capacitor C1, frequency changer circuit 7 has switch element-power transistor, power supply circuits 9 to resonant circuit 8 power supplies have rectification circuit, in order to power supply after the full-wave rectification source power supply.

These load coils 4, temperature detector 6 and above-mentioned each circuit are set in the electric cooker bottom separately, in order to simplify wiring construction.

If make the K switch of cooking be in the ON state, then relay J K switch is switched on, and high-frequency current circulates on the load coil 4.By the bottom of container 3, when thermistor detects and to cook and cook temperature and holding temperature during insulation, when cook temperature reaches when cooking end temp, above-mentioned relay is in the OFF state.

FM shown in Figure 2 is the cooling fan motor, and this fan is mainly with being the above-mentioned converter circuit power transistor of cooling, and fan is normally placed in the heat insulation backplate of electric cooker bottom, is known technology.

It needs to be noted, the power supply that is supplied to resonant circuit 8 concerning heated object is big capacity, present embodiment circuit structure practical shown in Figure 2, be suitable for rectification supply source power supply, even by full-wave rectification, because the voltage of rectification circuit is pulsating current, again because electric current and the voltage supplied are big capacity to heated object.Therefore can not obtain stable resonance, but it is filtered through choking-winding L and bridging condenser C2 to be applied to the electric current and the power supply of resonant circuit 8.

Pass through said process, on load coil 4, add through choking-winding L and filtered stable always electric current and the power supply of bridging condenser C2, under the prerequisite that 8 pairs of load coils 4 of resonant circuit are not influenced, can be earlier than unit or unit ON such as frequency changer circuit power transistors, the variable frequency control of the broad range of OFF, carry out appropriate reaction, can carry out the suction heating of the required suction engineering of cooking of extensive control range according to predefined program, the necessary Mi Jiare of boiling of the engineering of cooking, and the steamed rice of steamed rice engineering heating, and can burn appetizing rice.

Claims (1)

1, a kind of induction heating electric cooker, comprise container (3) by the alternating magnetic field heating, has resonant circuit (8), this resonant circuit (8) comprises heater coil (4) and the resonant capacitor C1 that makes this electric cooker heating, it is characterized in that by choking-winding L and the above-mentioned resonant circuit power supply of bridging condenser C2 filtering.

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