CN209046903U - Protect circuit and electromagnetic oven - Google Patents

Abstract

The utility model discloses a kind of protection circuit and electromagnetic oven, the protection circuit includes: insulated gate bipolar transistor IGBT and the positive freewheeling diode being parallel between the collector and emitter of IGBT.Thus, electromagnetic oven can be efficiently solved when using the cookware for being not suitable for electromagnetic heating by the freewheeling diode that forward direction is parallel between the collector and emitter of IGBT, and IGBT reverse current is more than IGBT damage problem caused by the electric current that freewheeling diode built in IGBT can bear.

Description

Protect circuit and electromagnetic oven

Technical field

The utility model relates to field of home appliance technology, in particular to a kind of protection circuit and one kind have protection electricity The electromagnetic oven on road.

Background technique

Electromagnetic oven is due to its convenience and good heating function, by more and more families as daily household Electric appliance uses.

When using electromagnetic oven, the cookware (cookware of such as irony or steel alloy) for being suitble to electromagnetic heating need to be selected to be added Heat.If the cookware of unsuitable electromagnetic heating is placed on electromagnetic oven and heats by user, it will appear IGBT (Insulated Gate Bipolar Transistor, insulated gate bipolar transistor) reverse current (passes through freewheeling diode built in IGBT Electric current) very big phenomenon easilys lead in this way sometimes even over the electric current that freewheeling diode built in IGBT can bear IGBT damage.

Utility model content

The utility model is intended to one of the technical issues of at least solving in the related technology to a certain extent.For this purpose, this reality It is to propose a kind of protection circuit with first novel purpose, electromagnetic oven can be efficiently solved and added using unsuitable electromagnetism When the cookware of heat, IGBT reverse current be more than caused by the electric current that freewheeling diode built in IGBT can bear IGBT damage and ask Topic.

Second purpose of the utility model is to propose a kind of electromagnetic oven.

To achieve the above object, on the one hand the utility model proposes a kind of protection circuit, comprising: insulated gate bipolar is brilliant Body pipe IGBT and the positive freewheeling diode being parallel between the collector and emitter of the IGBT.

According to the utility model proposes protection circuit, in the collector and emitter of insulated gate bipolar transistor IGBT Between positive in parallel freewheeling diode, so that electromagnetic oven can be efficiently solved using being not suitable for electricity by the freewheeling diode When the cookware of magnetic heating, IGBT reverse current is more than IGBT damage caused by the electric current that freewheeling diode built in IGBT can bear Bad problem.

In addition, can also have the following additional technical features: according to the utility model protection circuit set forth above

Specifically, the anode of the freewheeling diode is connect with the emitter of the IGBT, and the freewheeling diode is born Pole is connect with the collector of the IGBT.

Specifically, the performance parameter of the performance parameter of the freewheeling diode and the built-in freewheeling diode in the IGBT Unanimously.

Further, above-mentioned protection circuit, further includes: power supply, the emitter of the IGBT and the afterflow two The anode of pole pipe is connect with the cathode of the power supply respectively, the cathode of the collector of the IGBT and the freewheeling diode It is connect respectively with the anode of the power supply.

Specifically, the quantity of the freewheeling diode is multiple.

Specifically, the protection circuit is set in electromagnetic oven.

Further, above-mentioned protection circuit, further includes: coil, the coil respectively with the IGBT and the afterflow Diode series.

To achieve the above object, on the other hand the utility model proposes a kind of electromagnetic oven comprising above-mentioned protection electricity Road.

The utility model proposes electromagnetic oven can efficiently solve electromagnetic oven by above-mentioned protection circuit and use When being not suitable for the cookware of electromagnetic heating, IGBT reverse current is more than the electric current that freewheeling diode built in IGBT can bear and causes IGBT damage problem.

Detailed description of the invention

Fig. 1 is the circuit diagram according to the protection circuit of the utility model embodiment；

Fig. 2 is the circuit diagram according to the protection circuit of the utility model one embodiment；And

Fig. 3 is the circuit diagram according to the protection circuit of the utility model one embodiment.

Specific embodiment

The utility model is described below in detail, the example is shown in the accompanying drawings, wherein identical from beginning to end or class As label indicate same or similar element or element with the same or similar functions.Below with reference to attached drawing description It is exemplary, it is intended to for explaining the utility model, and should not be understood as limiting the present invention.

With reference to the accompanying drawings to describe the protection circuit proposed according to the utility model embodiment and with the protection circuit Electromagnetic oven.

Fig. 1 is the circuit diagram according to the protection circuit of the utility model embodiment.As shown in Figure 1, the protection circuit can wrap It includes: insulated gate bipolar transistor IGBT and the positive afterflow being parallel between the collector (pole C) of IGBT and emitter (pole E) Diode D1.

In the embodiments of the present invention, the anode of sustained diode 1 is connect, afterflow with the emitter (pole E) of IGBT The cathode of diode D1 and the collector (pole C) of IGBT connect.Wherein, the performance parameter of the sustained diode 1 in the embodiment It is consistent with the performance parameter of built-in sustained diode in IGBT.

That is, the built-in afterflow two between the pole C and the pole E of IGBT in an external sustained diode 1 and IGBT Pole pipe D-shaped is connected at parallel relationship, the cathode of sustained diode 1 and the pole C of IGBT, the anode and IGBT of sustained diode 1 The pole E connection.Wherein, the performance parameter of the sustained diode 1 in parallel between the pole C and the pole E of IGBT and IGBT's itself is interior The performance parameter for setting sustained diode is consistent.

In other words, the identical sustained diode 1 of performance parameter forms in parallel connect with the built-in sustained diode in IGBT Connect relationship.In this way when bearing IGBT reverse current, theoretically the built-in sustained diode in sustained diode 1 and IGBT is each The electric current of half is born, to reduce by the electric current in the built-in sustained diode in IGBT, so as to efficiently solve electricity For magnetic furnace when using the cookware for being not suitable for electromagnetic heating, IGBT reverse current is more than what freewheeling diode built in IGBT can bear IGBT damages problem caused by electric current.

Further, as shown in Fig. 2, above-mentioned protection circuit, may also include that power supply 30, the emitter (E of IGBT Pole) and sustained diode 1 anode connect respectively with the cathode of power supply 30, the collector (pole C) of IGBT and two pole of afterflow The cathode of pipe D1 is connect with the anode of power supply 30 respectively.Power supply 30 is used to provide driving voltage for IGBT.

In one embodiment of the utility model, above-mentioned protection circuit be may be disposed in electromagnetic oven.

As a specific example, as shown in figure 3, when protecting circuit to be set in electromagnetic oven, above-mentioned protection circuit, It may also include coil 40, coil 40 is connected with IGBT and sustained diode 1 respectively.

Wherein, one end of coil 40 is connect with the pole C of the cathode of freewheeling diode 20 and IGBT10 respectively, coil 40 it is another One end is connect with the anode of power supply 30, and the cathode of power supply 30 is positive and IGBT10 with freewheeling diode 20 respectively E is extremely connected.

Specifically, when electromagnetic oven works on power, power supply 30 generates the changing alternation in direction by coil 40 The inside in magnetic field, the cookware (being suitble to the cookware of electromagnetic heating, such as irony or the cookware of steel alloy) in alternating magnetic field generates Vortex, the vortex is so that cookware heats up, to realize heating.

It should be noted that built-in in the performance parameter and IGBT of the sustained diode 1 in the utility model embodiment The performance parameter of sustained diode can also be inconsistent, and specific performance parameter can be selected according to actual needs, here no longer into Row limitation.In addition, the quantity of the freewheeling diode 20 in the utility model embodiment can be 1, or it is multiple, specifically Number can be selected according to actual needs, no longer be limited here.

In conclusion according to the utility model proposes protection circuit, in the current collection of insulated gate bipolar transistor IGBT Positive parallel connection freewheeling diode between pole and emitter, so that can efficiently solve electromagnetic oven by the freewheeling diode makes When with the cookware of unsuitable electromagnetic heating, IGBT reverse current is more than the electric current that freewheeling diode built in IGBT can bear and leads The IGBT of cause damages problem.

In addition, the embodiments of the present invention also proposed a kind of electromagnetic oven comprising above-mentioned protection circuit.

The utility model proposes electromagnetic oven can efficiently solve electromagnetic oven by above-mentioned protection circuit and use When being not suitable for the cookware of electromagnetic heating, IGBT reverse current is more than the electric current that freewheeling diode built in IGBT can bear and causes IGBT damage problem.

In the description of the present invention, it should be understood that term " center ", " longitudinal direction ", " transverse direction ", " length ", " width Degree ", " thickness ", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom" "inner", "outside", " suitable The orientation or positional relationship of the instructions such as hour hands ", " counterclockwise ", " axial direction ", " radial direction ", " circumferential direction " is orientation based on the figure Or positional relationship, be merely for convenience of describing the present invention and simplifying the description, rather than the device of indication or suggestion meaning or Element must have a particular orientation, be constructed and operated in a specific orientation, therefore should not be understood as the limit to the utility model System.

In addition, term " first ", " second " are used for descriptive purposes only and cannot be understood as indicating or suggesting relative importance Or implicitly indicate the quantity of indicated technical characteristic.Define " first " as a result, the feature of " second " can be expressed or Implicitly include at least one this feature.The meaning of " plurality " is at least two, such as two in the description of the present invention, It is a, three etc., unless otherwise specifically defined.

In the present invention unless specifically defined or limited otherwise, term " installation ", " connected ", " connection ", " Gu It is fixed " etc. terms shall be understood in a broad sense, for example, it may be being fixedly connected, may be a detachable connection, or integral；It can be Mechanical connection, is also possible to be electrically connected；It can be directly connected, two can also be can be indirectly connected through an intermediary The interaction relationship of connection or two elements inside element, unless otherwise restricted clearly.For the common skill of this field For art personnel, the concrete meaning of above-mentioned term in the present invention can be understood as the case may be.

In the present invention unless specifically defined or limited otherwise, fisrt feature is in the second feature " on " or " down " It can be that the first and second features directly contact or the first and second features are by intermediary mediate contact.Moreover, first is special Sign can be fisrt feature above the second feature " above ", " above " and " above " and be directly above or diagonally above the second feature, or only Indicate that first feature horizontal height is higher than second feature.Fisrt feature under the second feature " below ", " below " and " below " can be with It is that fisrt feature is directly under or diagonally below the second feature, or is merely representative of first feature horizontal height less than second feature.

In the description of this specification, reference term "one", "some", " example ", " specific example " or " some to show The description of example " etc. means that this or example particular features, structures, materials, or characteristics described is combined to be contained in the utility model In at least one or example.In the present specification, schematic expression of the above terms are necessarily directed to identical or show Example.Moreover, particular features, structures, materials, or characteristics described can be in any one or more or example with suitable side Formula combines.In addition, without conflicting with each other, those skilled in the art can by described in this specification different or Example and difference or exemplary feature are combined.

Although the utility model has been shown and described above, it is to be understood that it is above-mentioned to be exemplary, it cannot Be construed as a limitation of the present invention, those skilled in the art in the scope of the utility model can to it is above-mentioned into Row change, modification, replacement and modification.

Claims (7)

1. a kind of protection circuit characterized by comprising insulated gate bipolar transistor IGBT and forward direction are parallel to the IGBT Collector and emitter between freewheeling diode, wherein

The anode of the freewheeling diode is connect with the emitter of the IGBT, the cathode of the freewheeling diode and the IGBT Collector connection so that the freewheeling diode and the built-in afterflow two in the IGBT are extremely in parallel.

2. protection circuit according to claim 1, which is characterized in that the performance parameter of the freewheeling diode with it is described The performance parameter of built-in freewheeling diode in IGBT is consistent.

3. protection circuit according to claim 1, which is characterized in that further include: power supply, the emitter of the IGBT It is connect respectively with the cathode of the power supply with the anode of the freewheeling diode, the collector of the IGBT and the afterflow The cathode of diode is connect with the anode of the power supply respectively.

4. protection circuit according to claim 1, which is characterized in that the quantity of the freewheeling diode is multiple.

5. protection circuit according to claim 1, which is characterized in that the protection circuit is set in electromagnetic oven.

6. protection circuit according to claim 5, which is characterized in that further include: coil, the coil respectively with it is described IGBT and freewheeling diode series connection.

7. a kind of electromagnetic oven, which is characterized in that including protection circuit as claimed in any one of claims 1 to 6.