CN204442723U - The zero passage of electromagnetic heating system and switching tube thereof opens checkout gear - Google Patents
The zero passage of electromagnetic heating system and switching tube thereof opens checkout gear Download PDFInfo
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- CN204442723U CN204442723U CN201520126432.7U CN201520126432U CN204442723U CN 204442723 U CN204442723 U CN 204442723U CN 201520126432 U CN201520126432 U CN 201520126432U CN 204442723 U CN204442723 U CN 204442723U
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Abstract
The zero passage that the utility model discloses a kind of electromagnetic heating system breaker in middle pipe opens checkout gear, comprising: for detecting the current detection circuit of the loop current of resonant circuit; The pulse-detecting circuit exporting the first pulse signal is processed to loop current; Main control unit, main control unit is connected with pulse-detecting circuit respectively with drive circuit, main control unit comprises the first counter counted the first pulse signal, if the count value of the first counter is greater than preset value in Preset Time, main control unit increases the service time interval of switching tube, to make drive circuit driving switch pipe zero passage open-minded.This zero passage opens checkout gear can the service time interval of automatic regulating switch pipe make its zero passage open-minded, improves the efficiency of electromagnetic heating system.The invention also discloses a kind of electromagnetic heating system.
Description
Technical field
The utility model relates to household electrical appliance technical field, and particularly a kind of zero passage of electromagnetic heating system breaker in middle pipe opens checkout gear and a kind of electromagnetic heating system.
Background technology
At present, the circuit arrangement of electromagnetic oven is mainly single tube IGBT (Insulated Gate Bipolar Transistor, insulated gate bipolar transistor) scheme, by judging the partial pressure value at coil panel and resonant capacitance two ends, to open IGBT according to the upset of synchronous compare signal.
But IGBT can only be worth open-minded by rule of thumb; in order to prevent IGBT advanced or delayed open-minded; IGBT is only operated in very narrow operation interval; and corresponding judgement cannot be made when factors such as coiling spacing, voltage, pan changes; make IGBT be easy to work in advanced or hysteretic state, thus make the heat of IGBT very large, and generally there is overtemperature protection due to electromagnetic oven; therefore limit the efficiency of heating surface of electromagnetic oven to a great extent, cause efficiency to be difficult to promote.
Utility model content
The purpose of this utility model is intended at least solve one of above-mentioned technological deficiency.
For this reason, an object of the present utility model is that the zero passage proposing a kind of electromagnetic heating system breaker in middle pipe opens checkout gear, can the service time interval of automatic regulating switch pipe make its zero passage open-minded, improve the efficiency of electromagnetic heating system.
Another object of the present utility model is to propose a kind of electromagnetic heating system.
For achieving the above object, the zero passage that the utility model proposes a kind of electromagnetic heating system breaker in middle pipe on the one hand opens checkout gear, described electromagnetic heating system comprises the resonant circuit be made up of heater coil, resonant capacitance and switching tube and the drive circuit driving described switching tube, and described zero passage is opened checkout gear and comprised: for detecting the current detection circuit of the loop current of described resonant circuit; Pulse-detecting circuit, described pulse-detecting circuit is connected with described current detection circuit, and described pulse-detecting circuit processes to export the first pulse signal to described loop current; Main control unit, described main control unit is connected with described pulse-detecting circuit respectively with described drive circuit, described main control unit comprises the first counter counted described first pulse signal, wherein, if the count value of described first counter is greater than preset value in Preset Time, described main control unit increases the service time interval of described switching tube, drives described switching tube zero passage open-minded to make described drive circuit.
Zero passage according to electromagnetic heating system breaker in middle pipe of the present utility model opens checkout gear, current detection circuit detects the loop current of resonant circuit, pulse-detecting circuit processes to export the first pulse signal to loop current, pulse number in the first counter records first pulse signal in main control unit, if the pulse number of the first counter records is greater than preset value in Preset Time, main control unit then increase switching tube service time interval to make drive circuit driving switch pipe zero passage open-minded, thus realize the self adaptation that switching tube opens, effectively prevent advanced or delayed the opening of switching tube and the switching tube loss caused is excessive, improve the efficiency of heating surface of electromagnetic heating system, thus improve the efficiency of electromagnetic heating system.
Further, if the count value of described first counter is less than or equal to described preset value in described Preset Time, the service time interval of described switching tube remains unchanged.
Preferably, described switching tube is IGBT, described current detection circuit comprises current transformer, one end of the armature winding of described current transformer is extremely connected with the C of described IGBT, the other end of the armature winding of described current transformer is connected with resonant capacitance with the heater coil after parallel connection, and the two ends of the secondary winding of described current transformer are as the first output of described current detection circuit and the second output.
Particularly, described pulse-detecting circuit comprises: the first resistance of series connection and the second resistance, one end and first of described first resistance is preset power supply and is connected, the other end of described first resistance is connected with one end of described second resistance, have first node between the other end of described first resistance and one end of described second resistance, the other end of described second resistance is connected to the ground; First voltage comparator, the negative input end of described first voltage comparator is connected with described first node, and the output of described first voltage comparator is connected with described main control unit; 3rd resistance, one end of described 3rd resistance is connected with the output of described first voltage comparator, and the other end and described first of described 3rd resistance is preset power supply and is connected; 4th resistance, described one end of 4th resistance is connected with the first output of described current detection circuit, ground connection after the described other end of the 4th resistance is connected with the second output of described current detection circuit; 5th resistance, one end of described 5th resistance is connected with the first output of described current detection circuit with described one end of 4th resistance respectively; First electric capacity, one end of described first electric capacity is connected with the other end of described 5th resistance, and the other end of described first electric capacity is connected with the second output of described current detection circuit; First diode of series connection and the second diode, the anode of described first diode is connected with the second output of described current detection circuit, the negative electrode of described first diode is connected with the anode of described second diode, between the negative electrode of described first diode and the anode of described second diode, there is Section Point, the negative electrode and described first of described second diode is preset power supply and is connected, and described Section Point is connected with the positive input terminal of described first voltage comparator with the other end of described 5th resistance respectively.
And, the zero passage of above-mentioned electromagnetic heating system breaker in middle pipe is opened checkout gear and is also comprised: for detecting the sync detection circuit of the voltage at described heater coil two ends, described sync detection circuit has the first test side, second test side and the first output, second output, described first test side is connected with one end of described heater coil, described second test side is connected with the other end of described heater coil, first output of described sync detection circuit, second output is connected respectively to described main control unit, wherein, when the voltage that the second output that the voltage that the first output of described sync detection circuit exports is greater than described sync detection circuit exports, timer in described main control unit starts timing, described first counter starts counting.
In addition, the utility model also proposed a kind of electromagnetic heating system, and it zero passage comprising above-mentioned electromagnetic heating system breaker in middle pipe opens checkout gear.
Wherein, electromagnetic heating system can comprise electromagnetic oven, electromagnetic rice cooker, prevention electromagnetic pressure cooker.
This electromagnetic heating system opens checkout gear by the zero passage of above-mentioned electromagnetic heating system breaker in middle pipe, achieve the self adaptation that electromagnetic heating system breaker in middle pipe is opened, effectively prevent because switching tube is advanced or delayed opening and the switching tube loss caused is excessive, improve the efficiency of heating surface and efficiency.
The aspect that the utility model is additional and advantage will part provide in the following description, and part will become obvious from the following description, or be recognized by practice of the present utility model.
Accompanying drawing explanation
The utility model above-mentioned and/or additional aspect and advantage will become obvious and easy understand from the following description of the accompanying drawings of embodiments, wherein:
Fig. 1 is the block diagram opening checkout gear according to the zero passage of the electromagnetic heating system breaker in middle pipe of the utility model embodiment;
Fig. 2 is the circuit diagram opening checkout gear according to the zero passage of the electromagnetic heating system breaker in middle pipe of the utility model embodiment;
Fig. 3 is according to the oscillogram in the electromagnetic heating system of the utility model embodiment;
Fig. 4 is the flow chart opened according to the zero passage of the electromagnetic heating system breaker in middle pipe of the utility model embodiment; And
Fig. 5 is the flow chart opening detection method according to the zero passage of the electromagnetic heating system breaker in middle pipe of the utility model embodiment.
Embodiment
Be described below in detail embodiment of the present utility model, the example of described embodiment is shown in the drawings, and wherein same or similar label represents same or similar element or has element that is identical or similar functions from start to finish.Being exemplary below by the embodiment be described with reference to the drawings, only for explaining the utility model, and can not being interpreted as restriction of the present utility model.
Disclosing hereafter provides many different embodiments or example is used for realizing different structure of the present utility model.Of the present utility model open in order to simplify, hereinafter the parts of specific examples and setting are described.Certainly, they are only example, and object does not lie in restriction the utility model.In addition, the utility model can in different example repeat reference numerals and/or letter.This repetition is to simplify and clearly object, itself does not indicate the relation between discussed various embodiment and/or setting.In addition, the various specific technique that the utility model provides and the example of material, but those of ordinary skill in the art can recognize the property of can be applicable to of other techniques and/or the use of other materials.In addition, fisrt feature described below second feature it " on " structure can comprise the embodiment that the first and second features are formed as directly contact, also can comprise other feature and be formed in embodiment between the first and second features, such first and second features may not be direct contacts.
In description of the present utility model, it should be noted that, unless otherwise prescribed and limit, term " installation ", " being connected ", " connection " should be interpreted broadly, such as, can be mechanical connection or electrical connection, also can be the connection of two element internals, can be directly be connected, also indirectly can be connected by intermediary, for the ordinary skill in the art, the concrete meaning of above-mentioned term can be understood as the case may be.
The zero passage describing the electromagnetic heating system breaker in middle pipe that the utility model embodiment proposes with reference to the accompanying drawings opens checkout gear and electromagnetic heating system.
Fig. 1 is the block diagram opening checkout gear according to the zero passage of the electromagnetic heating system breaker in middle pipe of the utility model embodiment.Wherein, as shown in Figure 1, electromagnetic heating system comprises the drive circuit 20 of the resonant circuit 10 and driving switch pipe Q be made up of heater coil L1, resonant capacitance CX1 and switching tube Q.Further, as shown in Figure 1, the zero passage of this electromagnetic heating system breaker in middle pipe is opened checkout gear and is comprised current detection circuit 30, pulse-detecting circuit 40 and main control unit 50.
Wherein, current detection circuit 30 is for detecting the loop current of resonant circuit 10, and pulse-detecting circuit 40 is connected with current detection circuit 30, and pulse-detecting circuit 40 pairs of loop currents process to export the first pulse signal.Main control unit 50 is connected with pulse-detecting circuit 40 respectively with drive circuit 20, main control unit 50 comprises the first counter counted the first pulse signal, wherein, if the count value of the first counter is greater than preset value in Preset Time, main control unit 50 increases the service time interval of switching tube Q, to make drive circuit 20 driving switch pipe Q zero passage open-minded.
According to an embodiment of the present utility model, if the count value of the first counter is less than or equal to preset value in Preset Time, the service time interval of switching tube Q remains unchanged.
Wherein, Preset Time and preset value can be demarcated according to actual conditions.
Particularly, as shown in Figure 1, heater coil L1, resonant capacitance CX1, electric capacity C0 and switching tube Q forms resonant tank, wherein, heater coil L1 heats to pan, one end of heater coil L1 and one end of resonant capacitance CX1, one end of electric capacity C0 is connected, the other end of heater coil L1 is connected with the other end of resonant capacitance CX1, the input of current detection circuit 30 is connected between the other end of heater coil L1 and the C pole of switching tube Q, for detecting the loop current of resonant circuit 10, ground connection GND after the other end of electric capacity C0 and the E of switching tube Q are extremely connected, the G pole of switching tube Q is connected with drive circuit 20.Pulse-detecting circuit 40 is connected with the output of current detection circuit 30, the loop current of pulse-detecting circuit 40 to the resonant circuit 10 detected processes to export the first pulse signal, main control unit 50 is connected with pulse-detecting circuit 40 respectively with drive circuit 20, pulse number in the first pulse signal that the first counter records pulse-detecting circuit 40 in main control unit 50 exports, if the pulse number of the first counter records is greater than preset value, main control unit 50 increases the service time interval of switching tube Q; If the pulse number of the first counter records is less than or equal to preset value, then the service time interval of switching tube Q remains unchanged, and finally makes drive circuit 20 driving switch pipe Q zero passage open-minded.
Preferably, as shown in Figure 2, switching tube Q can be IGBT, current detection circuit 30 can comprise Current Transmit, one end of the armature winding of Current Transmit is extremely connected with the C of IGBT, the other end of the armature winding of Current Transmit is connected with resonant capacitance CX1 with the heater coil L1 after parallel connection, and the two ends of the secondary winding of Current Transmit are as the first output XL1 of current detection circuit 30 and the second output XL2.
According to an embodiment of the present utility model, as shown in Figure 2, pulse-detecting circuit 40 comprises the first resistance R1, second resistance R2, first voltage comparator P1, 3rd resistance R3, 4th resistance R4, 5th resistance R5, first electric capacity C1, first diode D1 and the second diode D2, wherein, first resistance R1 and the second resistance R2 connects, one end and first of first resistance R1 is preset power supply such as+5V and is connected, the other end of the first resistance R1 is connected with one end of the second resistance R2, between the other end of the first resistance R1 and one end of the second resistance R2, there is first node J1, the other end of the second resistance R2 is connected with ground GND.The negative input end of the first voltage comparator P1 is connected with first node J1, and the output OUT of the first voltage comparator P1 is connected with main control unit 50 as the output INT1 of pulse-detecting circuit 40.One end of 3rd resistance R3 is connected with the output OUT of the first voltage comparator P1, and the other end and first of the 3rd resistance R3 is preset power supply such as+5V power supply and is connected.One end of 4th resistance R4 is connected with the first output XL1 of current detection circuit 30, ground connection GND after the other end of the 4th resistance R4 is connected with the second output XL2 of current detection circuit 30.One end of 5th resistance R5 is connected with the first output XL1 of current detection circuit 30 with one end of the 4th resistance R4 respectively.One end of first electric capacity C1 is connected with the other end of the 5th resistance R5, and the other end of the first electric capacity C1 is connected with the second output XL2 of current detection circuit 30.First diode D1 and the second diode D2 connects, the anode of the first diode D1 is connected with the second output XL2 of current detection circuit 30, the negative electrode of the first diode D1 is connected with the anode of the second diode D2, between the negative electrode of the first diode D1 and the anode of the second diode D2, there is Section Point J2, the negative electrode and first of the second diode D2 is preset power supply such as+5V power supply and is connected, and Section Point J2 is connected with the positive input terminal of the first voltage comparator P1 with the other end of the 5th resistance R5 respectively.Wherein, the amplitude by regulating the size of the 4th resistance R4 can regulate input current.
According to an embodiment of the present utility model, as Fig. 1, shown in Fig. 2, the zero passage of above-mentioned electromagnetic heating system breaker in middle pipe is opened checkout gear and is also comprised sync detection circuit 60, sync detection circuit 60 detects the voltage at heater coil L1 two ends, sync detection circuit has the first test side V1, second test side V2 and the first output OUT1, second output OUT2, first test side V1 is connected with one end of heater coil L1, second test side V2 is connected with the other end of heater coil L1, first output OUT1 of sync detection circuit 60, second output OUT2 is connected respectively to main control unit 50, wherein, when the voltage Vb that the second output OUT2 that the voltage Va that the first output OUT1 of sync detection circuit 60 exports is greater than sync detection circuit 60 exports, timer in main control unit 50 starts timing, first counter starts counting.
Particularly, as shown in Figure 2, sync detection circuit 60 comprises the 6th resistance R6, 7th resistance R7, 8th resistance R8, 9th resistance R9, tenth resistance R10, 11 resistance R11, 12 resistance R12, 13 resistance R13, 14 resistance R14, 15 resistance R15 and the second electric capacity C2, wherein, 6th resistance R6, 7th resistance R7, 8th resistance R8 and the 9th resistance R9 connects, one end of 6th resistance R6 is connected with one end of heater coil L1 as the first test side V1 of sync detection circuit 60, the other end of the 6th resistance R6 is connected with one end of the 7th resistance R7, the other end of the 7th resistance R7 is connected with one end of the 8th resistance R8, the other end of the 8th resistance R8 is connected with one end of the 9th resistance R9, the other end of the 9th resistance R9 is connected as the first output OUT1 of sync detection circuit 60 with one end of the second electric capacity C2.Tenth resistance R10 and the 11 resistance R11 connects, one end of tenth resistance R10 is connected with the other end of heater coil L1 as the second test side V2 of sync detection circuit 60, the other end of the tenth resistance R10 is connected with one end of the 11 resistance R11, and the other end of the 11 resistance R11 is connected as the second output OUT2 of sync detection circuit 60 with the other end of the second electric capacity C2.12 resistance R12 and the 13 resistance R13 connects, and one end of the 12 resistance R12 is connected with one end of the second electric capacity C2, and the other end of the 12 resistance R12 is connected with one end of the 13 resistance R13, the other end ground connection GND of the 13 resistance R13.14 resistance R14 and the 15 resistance R15 connects, and one end of the 14 resistance R14 is connected with the other end of the second electric capacity C2, and the other end of the 14 resistance R14 is connected with one end of the 15 resistance R15, the other end ground connection GND of the 15 resistance R15.
In addition, according to a concrete example of utility model, as Fig. 1, shown in Fig. 2, electromagnetic heating system also comprises by protection assembly Fx, 3rd electric capacity C3, the power supply circuits of the electromagnetic heating system of rectifier 70 and the second inductance L 2 composition, wherein, one end of protection assembly Fx is connected with the live wire L of the alternating current 220VAC of input, the other end of protection assembly Fx respectively with one end of the 3rd electric capacity C3, second pin 2 of rectifier 70 is connected, 3rd pin 3 of rectifier 70 respectively with the zero line N of the alternating current 220VAC of input, the other end of the 3rd electric capacity C3 is connected, first pin 1 of rectifier 70 is connected with one end of the second inductance L 2, 4th pin 4 ground connection GND of rectifier 70, the other end of the second inductance L 2 is connected with resonant circuit 10.
When electromagnetic heating system energising is started working, IGBT is open-minded the need of upset to use sync detection circuit 60 to judge, when sync detection circuit 60 detect resonant circuit 10 discharge within cycle of oscillation close to an end time, IGBT must be opened to maintain oscillator signal, now, main control unit 50 enters the service time interval T that IGBT is opened in interrupt routine setting upset, if the service time interval T of setting is crossed, conference is delayed opens IGBT, if the too small meeting of service time interval T opens IGBT in advance, this firmly open situation under make the caloric value of IGBT very large, therefore, must IGBT be driven to open when the C pole tension of IGBT is zero just can make the loss of IGBT reach minimum.But because the service time interval T preset in main control unit 50 generally rule of thumb sets, cannot IGBT be driven accurately open-minded when the C pole tension of IGBT is zero, and, cannot make when the factor such as pan, voltage changes and judge to adjust service time interval T accordingly, therefore, needing to increase feedback network drives IGBT zero passage open-minded to the service time interval T revising IGBT to make drive circuit 20.
Particularly, when electromagnetic heating system energising is started working, the resonant tank be made up of heater coil L1, resonant capacitance CX1, electric capacity C0 and IGBT starts vibration, the voltage waveform that sync detection circuit 60 exports as shown in Figure 3, wherein, when the magnitude of voltage Va of the first output OUT1 of sync detection circuit 60 is greater than the magnitude of voltage Vb of the second output OUT2, main control unit 50 enters interrupt routine setting service time interval T and starts timing, and the first counter simultaneously in main control unit 50 starts counting.Wherein, if the too small meeting of service time interval T of setting makes IGBT open-minded in advance, now there is electric current superimposed pulse when the C pole tension of IGBT is non-vanishing, reaction can export a current surge signal (as shown in Figure 3) on Current Transmit, and the dividing potential drop that this current surge signal forms with the first resistance R1 and the second resistance R2 after amplitude modulation, filtering compares with the waveform shown in output map 3.If the pulse number in the waveform that the output INT1 of the pulse-detecting circuit 40 that main control unit 50 records in Preset Time exports is K, and the pulse number K of record is greater than preset value as 13, then main control unit 50 increases the service time interval T of IGBT, then cycle detection regulate service time interval T, until drive circuit 20 drives IGBT zero passage open-minded, realize self adaptation.
Further, according to a concrete example of the present utility model, as shown in Figure 4, the process that the zero passage of electromagnetic heating system breaker in middle pipe is opened comprises the following steps:
S101, the power of selected electromagnetic heating system, starts to heat to pan.
S102, enters interruption as Va>Vb, and arranging service time interval T is 1us, and arranging timer period is 30us, and arranging A is the first counter.
S103, judges whether Va is greater than Vb.If so, step S104 is performed; If not, step S 103 is returned.
S104, enters and interrupts opening timer, open the first counter A.
Timeing closing device after S105,30us, preserves the count value of the first counter A.
S106, judges whether cycle-index is less than 10 times.If so, step S107 is performed; If not, step S103 is returned.
S107, judges whether the aggregate-value K of the first counter A is less than or equal to 13.If so, step S108 is performed; If not, step S109 is performed.
S108, IGBT zero passage is open-minded.
S109, increase service time interval T, timer, the first counter A reset.
In sum, zero passage according to the electromagnetic heating system breaker in middle pipe of the utility model embodiment opens checkout gear, current detection circuit detects the loop current of resonant circuit, pulse-detecting circuit processes to export the first pulse signal to loop current, pulse number in the first counter records first pulse signal in main control unit, if the pulse number of the first counter records is greater than preset value in Preset Time, main control unit then increase switching tube service time interval to make drive circuit driving switch pipe zero passage open-minded, thus realize the self adaptation that switching tube opens, effectively prevent advanced or delayed the opening of switching tube and the switching tube loss caused is excessive, improve the efficiency of heating surface of electromagnetic heating system, thus improve the efficiency of electromagnetic heating system.
In addition, embodiment of the present utility model also proposed a kind of electromagnetic heating system, and it zero passage comprising above-mentioned electromagnetic heating system breaker in middle pipe opens checkout gear.
Wherein, electromagnetic heating system can comprise electromagnetic oven, electromagnetic rice cooker, prevention electromagnetic pressure cooker.
This electromagnetic heating system opens checkout gear by the zero passage of above-mentioned electromagnetic heating system breaker in middle pipe, achieve the self adaptation that electromagnetic heating system breaker in middle pipe is opened, effectively prevent because switching tube is advanced or delayed opening and the switching tube loss caused is excessive, improve the efficiency of heating surface and efficiency.
Fig. 5 is the flow chart opening detection method according to the zero passage of the electromagnetic heating system breaker in middle pipe of the utility model embodiment.Wherein, as shown in Figure 1 and Figure 2, electromagnetic heating system comprises the drive circuit of resonant circuit and the driving switch pipe be made up of heater coil, resonant capacitance and switching tube, and as shown in Figure 5, the zero passage of this electromagnetic heating system breaker in middle pipe is opened detection method and comprised the following steps:
S1, detects the loop current of resonant circuit.
S2, processes to export the first pulse signal to loop current.
S3, is counted the first pulse signal by the first counter, and in Preset Time, judge whether the count value of the first counter is greater than preset value.
Wherein, Preset Time and preset value can be demarcated according to actual conditions.
S4, if judge that the count value of the first counter is greater than preset value, then increases the service time interval of switching tube, to make drive circuit driving switch pipe zero passage open-minded.
According to an embodiment of the present utility model, if the count value of the first counter is less than or equal to preset value in Preset Time, the service time interval of switching tube remains unchanged.
According to an embodiment of the present utility model, the zero passage of above-mentioned electromagnetic heating system breaker in middle pipe is opened detection method and is also comprised: the voltage detecting heater coil two ends; When the voltage of heater coil one end is greater than the voltage of the heater coil other end, start timing, the first counter also starts counting.
According to a concrete example of the present utility model, as shown in Figure 1, when electromagnetic heating system energising is started working, the voltage at main control unit real-time judge heater coil two ends, when the voltage of heater coil one end is greater than the voltage of the heater coil other end, switching tube must be opened if IGBT is to maintain oscillator signal, now, main control unit enters the service time interval T that interrupt routine setting rotates logical switching tube, if the service time interval T of setting is crossed, conference is delayed opens switching tube, if the too small meeting of service time interval T opens switching tube in advance, this firmly open situation under make the caloric value of switching tube very large, therefore, must open the loss of switching tube just can be made to reach minimum by driving switch pipe when the C pole tension of switching tube is zero.But because the service time interval T preset in main control unit generally rule of thumb sets, cannot accurately when the C pole tension of switching tube is zero driving switch pipe open-minded, and, cannot make when the factor such as pan, voltage changes and judge to adjust service time interval T accordingly, therefore, need increase feedback network to revise switching tube service time interval T to make drive circuit driving switch pipe zero passage open-minded.
Further, as shown in Figure 2, when electromagnetic heating system energising is started working, by heater coil, the resonant tank of resonant capacitance and switching tube composition starts vibration, current detection circuit detects the loop current of resonant circuit in real time, pulse-detecting circuit processes to export the first pulse signal to main control unit to loop current, main control unit is by the voltage at sync detection circuit real-time judge heater coil two ends simultaneously, when the magnitude of voltage of the first output of sync detection circuit is greater than the magnitude of voltage of the second output, namely when the voltage of heater coil one end is greater than the voltage of the heater coil other end, main control unit enters interrupt routine setting service time interval T and starts timing, the first counter simultaneously in main control unit starts counting.Wherein, if the too small meeting of service time interval T of main control unit setting makes switching tube open-minded in advance, now there is electric current superimposed pulse when the C pole tension of switching tube is non-vanishing, reaction can export a current surge signal (as shown in Figure 3) on current detection circuit, this current surge signal through pulse-detecting circuit with the waveform shown in output map 3.If the pulse number in the waveform that the pulse-detecting circuit that the first counter records in Preset Time exports is greater than preset value as 13, then main control unit increases the service time interval T of switching tube, then cycle detection regulate service time interval T, until drive circuit driving switch pipe zero passage is open-minded, realize self adaptation.
Zero passage according to the electromagnetic heating system breaker in middle pipe of the utility model embodiment opens detection method, first the loop current of resonant circuit is detected, process to export the first pulse signal to loop current, then by the first counter, the first pulse signal is counted, and in Preset Time, judge whether the count value of the first counter is greater than preset value, if judge that the count value of the first counter is greater than preset value, then increase the service time interval of switching tube, to make drive circuit driving switch pipe zero passage open-minded, thus realize the self adaptation that switching tube opens, effectively prevent advanced or delayed the opening of switching tube and the switching tube loss caused is excessive, improve the efficiency of heating surface of electromagnetic heating system, thus improve the efficiency of electromagnetic heating system.
Describe and can be understood in flow chart or in this any process otherwise described or method, represent and comprise one or more for realizing the module of the code of the executable instruction of the step of specific logical function or process, fragment or part, and the scope of preferred implementation of the present utility model comprises other realization, wherein can not according to order that is shown or that discuss, comprise according to involved function by the mode while of basic or by contrary order, carry out n-back test, this should understand by embodiment person of ordinary skill in the field of the present utility model.
In flow charts represent or in this logic otherwise described and/or step, such as, the sequencing list of the executable instruction for realizing logic function can be considered to, may be embodied in any computer-readable medium, for instruction execution system, device or equipment (as computer based system, comprise the system of processor or other can from instruction execution system, device or equipment instruction fetch and perform the system of instruction) use, or to use in conjunction with these instruction execution systems, device or equipment.With regard to this specification, " computer-readable medium " can be anyly can to comprise, store, communicate, propagate or transmission procedure for instruction execution system, device or equipment or the device that uses in conjunction with these instruction execution systems, device or equipment.The example more specifically (non-exhaustive list) of computer-readable medium comprises following: the electrical connection section (electronic installation) with one or more wiring, portable computer diskette box (magnetic device), random access memory (RAM), read-only memory (ROM), erasablely edit read-only memory (EPROM or flash memory), fiber device, and portable optic disk read-only memory (CDROM).In addition, computer-readable medium can be even paper or other suitable media that can print described program thereon, because can such as by carrying out optical scanner to paper or other media, then carry out editing, decipher or carry out process with other suitable methods if desired and electronically obtain described program, be then stored in computer storage.
Should be appreciated that each several part of the present utility model can realize with hardware, software, firmware or their combination.In the above-described embodiment, multiple step or method can with to store in memory and the software performed by suitable instruction execution system or firmware realize.Such as, if realized with hardware, the same in another embodiment, can realize by any one in following technology well known in the art or their combination: the discrete logic with the logic gates for realizing logic function to data-signal, there is the application-specific integrated circuit (ASIC) of suitable combinational logic gate circuit, programmable gate array (PGA), field programmable gate array (FPGA) etc.
Those skilled in the art are appreciated that realizing all or part of step that above-described embodiment method carries is that the hardware that can carry out instruction relevant by program completes, described program can be stored in a kind of computer-readable recording medium, this program perform time, step comprising embodiment of the method one or a combination set of.
In addition, each functional unit in each embodiment of the utility model can be integrated in a processing module, also can be that the independent physics of unit exists, also can be integrated in a module by two or more unit.Above-mentioned integrated module both can adopt the form of hardware to realize, and the form of software function module also can be adopted to realize.If described integrated module using the form of software function module realize and as independently production marketing or use time, also can be stored in a computer read/write memory medium.
The above-mentioned storage medium mentioned can be read-only memory, disk or CD etc.
In the description of this specification, specific features, structure, material or feature that the description of reference term " embodiment ", " some embodiments ", " example ", " concrete example " or " some examples " etc. means to describe in conjunction with this embodiment or example are contained at least one embodiment of the present utility model or example.In this manual, identical embodiment or example are not necessarily referred to the schematic representation of above-mentioned term.And the specific features of description, structure, material or feature can combine in an appropriate manner in any one or more embodiment or example.
Although illustrate and described embodiment of the present utility model, for the ordinary skill in the art, be appreciated that and can carry out multiple change, amendment, replacement and modification to these embodiments when not departing from principle of the present utility model and spirit, scope of the present utility model is by claims and equivalency thereof.
Claims (7)
1. the zero passage of an electromagnetic heating system breaker in middle pipe opens checkout gear, it is characterized in that, described electromagnetic heating system comprises the resonant circuit be made up of heater coil, resonant capacitance and switching tube and the drive circuit driving described switching tube, and described zero passage is opened checkout gear and comprised:
For detecting the current detection circuit of the loop current of described resonant circuit;
Pulse-detecting circuit, described pulse-detecting circuit is connected with described current detection circuit, and described pulse-detecting circuit processes to export the first pulse signal to described loop current;
Main control unit, described main control unit is connected with described pulse-detecting circuit respectively with described drive circuit, described main control unit comprises the first counter counted described first pulse signal, wherein, if the count value of described first counter is greater than preset value in Preset Time, described main control unit increases the service time interval of described switching tube, drives described switching tube zero passage open-minded to make described drive circuit.
2. the zero passage of electromagnetic heating system breaker in middle pipe according to claim 1 opens checkout gear, it is characterized in that, if the count value of described first counter is less than or equal to described preset value in described Preset Time, the service time interval of described switching tube remains unchanged.
3. the zero passage of electromagnetic heating system breaker in middle pipe according to claim 1 and 2 opens checkout gear, it is characterized in that, described switching tube is IGBT, described current detection circuit comprises current transformer, one end of the armature winding of described current transformer is extremely connected with the C of described IGBT, the other end of the armature winding of described current transformer is connected with resonant capacitance with the heater coil after parallel connection, and the two ends of the secondary winding of described current transformer are as the first output of described current detection circuit and the second output.
4. the zero passage of electromagnetic heating system breaker in middle pipe according to claim 3 opens checkout gear, and it is characterized in that, described pulse-detecting circuit comprises:
First resistance of series connection and the second resistance, one end and first of described first resistance is preset power supply and is connected, the other end of described first resistance is connected with one end of described second resistance, have first node between the other end of described first resistance and one end of described second resistance, the other end of described second resistance is connected to the ground;
First voltage comparator, the negative input end of described first voltage comparator is connected with described first node, and the output of described first voltage comparator is connected with described main control unit;
3rd resistance, one end of described 3rd resistance is connected with the output of described first voltage comparator, and the other end and described first of described 3rd resistance is preset power supply and is connected;
4th resistance, described one end of 4th resistance is connected with the first output of described current detection circuit, ground connection after the described other end of the 4th resistance is connected with the second output of described current detection circuit;
5th resistance, one end of described 5th resistance is connected with the first output of described current detection circuit with described one end of 4th resistance respectively;
First electric capacity, one end of described first electric capacity is connected with the other end of described 5th resistance, and the other end of described first electric capacity is connected with the second output of described current detection circuit;
First diode of series connection and the second diode, the anode of described first diode is connected with the second output of described current detection circuit, the negative electrode of described first diode is connected with the anode of described second diode, between the negative electrode of described first diode and the anode of described second diode, there is Section Point, the negative electrode and described first of described second diode is preset power supply and is connected, and described Section Point is connected with the positive input terminal of described first voltage comparator with the other end of described 5th resistance respectively.
5. the zero passage of electromagnetic heating system breaker in middle pipe according to claim 1 opens checkout gear, it is characterized in that, also comprises:
For detecting the sync detection circuit of the voltage at described heater coil two ends, described sync detection circuit has the first test side, second test side and the first output, second output, described first test side is connected with one end of described heater coil, described second test side is connected with the other end of described heater coil, first output of described sync detection circuit, second output is connected respectively to described main control unit, wherein, when the voltage that the second output that the voltage that the first output of described sync detection circuit exports is greater than described sync detection circuit exports, timer in described main control unit starts timing, described first counter starts counting.
6. an electromagnetic heating system, is characterized in that, the zero passage comprising the electromagnetic heating system breaker in middle pipe according to any one of claim 1-5 opens checkout gear.
7. electromagnetic heating system according to claim 6, is characterized in that, described electromagnetic heating system comprises electromagnetic oven, electromagnetic rice cooker, prevention electromagnetic pressure cooker.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520126432.7U CN204442723U (en) | 2015-03-04 | 2015-03-04 | The zero passage of electromagnetic heating system and switching tube thereof opens checkout gear |
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| CN201520126432.7U CN204442723U (en) | 2015-03-04 | 2015-03-04 | The zero passage of electromagnetic heating system and switching tube thereof opens checkout gear |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105992419A (en) * | 2015-03-04 | 2016-10-05 | 佛山市顺德区美的电热电器制造有限公司 | Electromagnetic heating system, and zero-crossing switched-on detection method and device of switch tube |
| CN108419318A (en) * | 2017-02-10 | 2018-08-17 | 佛山市顺德区美的电热电器制造有限公司 | Electromagnetic heater, electromagnetic heating system and its control method |
-
2015
- 2015-03-04 CN CN201520126432.7U patent/CN204442723U/en not_active Withdrawn - After Issue
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105992419A (en) * | 2015-03-04 | 2016-10-05 | 佛山市顺德区美的电热电器制造有限公司 | Electromagnetic heating system, and zero-crossing switched-on detection method and device of switch tube |
| CN105992419B (en) * | 2015-03-04 | 2022-09-06 | 佛山市顺德区美的电热电器制造有限公司 | Electromagnetic heating system and zero-crossing switching-on detection method and device of switching tube of electromagnetic heating system |
| CN108419318A (en) * | 2017-02-10 | 2018-08-17 | 佛山市顺德区美的电热电器制造有限公司 | Electromagnetic heater, electromagnetic heating system and its control method |
| CN108419318B (en) * | 2017-02-10 | 2020-12-22 | 佛山市顺德区美的电热电器制造有限公司 | Electromagnetic heating device, electromagnetic heating system and control method thereof |
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