CN205029898U - Electromagnetic heating system and surge detection device thereof - Google Patents
Electromagnetic heating system and surge detection device thereof Download PDFInfo
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- CN205029898U CN205029898U CN201520622387.4U CN201520622387U CN205029898U CN 205029898 U CN205029898 U CN 205029898U CN 201520622387 U CN201520622387 U CN 201520622387U CN 205029898 U CN205029898 U CN 205029898U
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Abstract
The utility model discloses an electromagnetic heating system and surge detection device thereof, electromagnetic heating system include IGBT pipe, resonator module and are used for converting the alternating current power supply of input the rectifier module of first direct current in order to supply with resonator module to that the surge detection device include: with alternating current power supply the 2nd continuous rectifier module of input, the 2nd rectifier module converts the alternating current power supply of input to the second direct current, the zero -crossing detection and the interval surge detection module of zero passage that link to each other with the 2nd rectifier module's output, the interval surge detection module of zero -crossing detection and zero passage detect the galvanic voltage of second between with the zero passage state area that obtains alternating current power supply to if generate the third detected signal when second direct current takes place the surge in between alternating current power supply's zero passage state area, control module, control module manage IGBT according to the third detected signal in between alternating current power supply's zero passage state area and carry out surge protection to realize that the interval surge of commercial power zero passage detects, make surge protection reliability comprehensive more.
Description
Technical field
The utility model relates to technical field of electric appliances, particularly a kind of surge checkout gear of electromagnetic heating system and a kind of electromagnetic heating system with this surge checkout gear.
Background technology
Relevant electromagnetic heating system adopts following two kinds of modes to carry out surge detection usually:
The first, only detects the forward surge detection mode of forward surge.Because forward surge protection circuit can only respond the surge of direct impulse; the surge of negative-going pulse cannot be responded; therefore; its shortcoming existed is; when having the surge of negative-going pulse in systems in which; some key components of electromagnetic heating system can be damaged, and then it is abnormal that electromagnetic heating system work is occurred, thus protection is comprehensive not.
It two is, the two-way surge detection mode that positive and negative surge all detects.Two-way surge protection circuit general Yao You tri-road voltage detecting circuit, detects the generation of positive and negative surge according to the change of adjacent two-way voltage upset.But this surge testing circuit detects voltage on civil power zero passage place three tunnel very close, there will be surge protection by mistake, therefore need to add that zero passage screened circuit detects with the surge shielding zero passage interval.But its shortcoming existed is, the interval surge of zero passage detects and occurs blind area, and the reliability that surge detects declines to some extent.
Therefore, there are the needs improved in correlation technique.
Utility model content
The utility model is intended to solve one of technical problem in correlation technique at least to a certain extent.For this reason, an object of the present utility model is the surge checkout gear proposing a kind of electromagnetic heating system, and this device can realize non-zero passage surge non-blind area that is interval and civil power zero passage interval and detect.
Another object of the present utility model is to propose a kind of electromagnetic heating system.
For achieving the above object, the utility model proposes a kind of surge checkout gear of electromagnetic heating system on the one hand, described electromagnetic heating system comprises IGBT pipe, resonance modules and for the AC power of input being converted to the first direct current to supply the first rectification module of described resonance modules, described surge checkout gear comprises: the second rectification module, the input of described second rectification module is connected with the AC power of described input, and described second rectification module converts the AC power of described input to second direct current; Zero passage detection and the interval surge detection module of zero passage, described zero passage detection and the interval surge detection module of zero passage are connected with the output of described second rectification module, the interval surge detection module of described zero passage detection and zero passage detects described second galvanic voltage with between the zero passage state area obtaining described AC power, and if in the zero passage state area of described AC power in described second direct current generation surge time generate the 3rd detection signal; Control module, described control module is connected with described zero passage detection and the interval surge detection module of zero passage, and described control module is interior in the zero passage state area of described AC power carries out surge protection according to described 3rd detection signal to described IGBT pipe.
According to the surge checkout gear of the electromagnetic heating system that the utility model proposes; control module is interior in the zero passage state area of AC power carries out surge protection according to the 3rd detection signal to IGBT pipe; thus the surge realizing civil power zero passage interval detects; make surge protection overall reliability more, and this device circuit structure is simplified.
Further; the surge checkout gear of described electromagnetic heating system; also comprise: the second detection module; described second detection module is connected with described control module with the output of described second rectification module respectively; described second detection module detects described second galvanic voltage to generate the second detection signal when described second direct current generation forward surge; wherein, described control module is used for carrying out surge protection according to described second detection signal to described IGBT pipe when described AC power is not between described zero passage state area.
Further; the surge checkout gear of described electromagnetic heating system also comprises: first detection module; described first detection module is connected with described control module with the C pole of described IGBT pipe respectively; the voltage that described first detection module detects the C pole of described IGBT pipe is to generate the first detection signal when described first direct current generation negative sense surge; wherein, described control module is used for carrying out surge protection according to described first detection signal to described IGBT pipe when described AC power is not between described zero passage state area.
Particularly, described zero passage detection and the interval surge detection module of zero passage, comprise: the first resistance unit and the first electric capacity, one end of described first resistance unit is connected with the output of described second rectification module, and described first electric capacity is in parallel with described first resistance unit; Second resistance unit, one end of described second resistance unit is connected with the other end of described first resistance unit; First resistance and the second electric capacity, one end of described first resistance is connected with the other end of described second resistance unit, the other end ground connection of described first resistance, described second electric capacity and described first resistor coupled in parallel, wherein, have first node between described first resistance and described second resistance unit, described first node is connected with described control module as the output of described zero passage detection and the interval surge detection module of zero passage; First diode, the negative electrode of described first diode is connected with default power supply, and the anode of described first diode is connected with described first node.
Further, described second detection module comprises: the 3rd resistance unit, and one end of described 3rd resistance unit is connected with the output of described second rectification module; Second resistance, one end of described second resistance is connected with the other end of described 3rd resistance unit; 3rd resistance and the 3rd electric capacity, one end of described 3rd resistance is connected with the other end of described second resistance, the other end ground connection of described 3rd resistance, described 3rd electric capacity and described 3rd resistor coupled in parallel; 4th resistance, one end of described 4th resistance is connected with the other end of described 3rd resistance unit with one end of described second resistance respectively; 4th resistance unit and the 4th electric capacity, one end of described 4th resistance unit is connected with the other end of described 4th resistance, the other end ground connection of described 4th resistance unit, and described 4th electric capacity is in parallel with described 4th resistance unit; Wherein, between described second resistance and described 3rd resistance, there is Section Point, have the 3rd node between described 4th resistance and described 4th resistance unit, described Section Point is connected with described control module with the second output with first output of described 3rd node respectively as described second detection module.
Further, described first detection module comprises: the 5th resistance, and one end of described 5th resistance is extremely connected with the C of described IGBT pipe; 5th resistance unit and the 5th electric capacity, one end of described 5th resistance unit is connected with the other end of described 5th resistance, the other end ground connection of described 5th resistance unit, described 5th electric capacity is in parallel with described 5th resistance unit, wherein, have the 4th node between described 5th resistance and described 5th resistance unit, described 4th node is connected with described control module as the output of described first detection module; Second diode, the negative electrode of described second diode is connected with default power supply, and the anode of described second diode is connected with described 4th node.
Particularly, described control module comprises: the first comparator, and the inverting input of described first comparator is connected with default power supply, and the normal phase input end of described first comparator is connected with the output of described zero passage detection and the interval surge detection module of zero passage; Second comparator, the inverting input of described second comparator is connected with the first output of described second detection module, and the normal phase input end of described second comparator is connected with the second output of described second detection module; AD conversion unit, the analog signal end of described AD conversion unit is connected with the output of described first detection module; Control unit, described control unit is connected with the digital signal end of described AD conversion unit with the output of described first comparator, the output of described second comparator respectively.
Further, described second rectification module comprises: the 3rd diode, and the described anode of the 3rd diode is connected with the first output of described AC power; 4th diode, the described anode of the 4th diode is connected with the second output of described AC power, is connected respectively after the negative electrode of described 4th diode is connected with the negative electrode of described 3rd diode with described second detection module with zero passage detection and the interval surge detection module of zero passage.
For achieving the above object, the utility model proposes a kind of electromagnetic heating system on the other hand, comprises the surge checkout gear of described electromagnetic heating system.
According to the electromagnetic heating system that the utility model proposes, by the surge checkout gear of above-mentioned electromagnetic heating system, the surge that can realize civil power zero passage interval detects, and makes surge protection more comprehensively reliable.
Accompanying drawing explanation
Fig. 1 is the block diagram of the surge checkout gear of electromagnetic heating system according to the utility model embodiment;
Fig. 2 is the waveform schematic diagram of the forward surge according to the utility model specific embodiment;
Fig. 3 is the waveform schematic diagram of the negative sense surge according to the utility model specific embodiment;
Fig. 4 is the waveform unfolds figure of Fig. 3;
Fig. 5 be according to the zero passage state area of the utility model specific embodiment between waveform schematic diagram;
Fig. 6 is the waveform schematic diagram of the C pole tension of IGBT pipe according to the utility model specific embodiment;
Fig. 7 is the circuit theory diagrams of the surge checkout gear of electromagnetic heating system according to the utility model specific embodiment;
Fig. 8 is the schematic diagram of control module in Fig. 7;
Fig. 9 is the circuit theory diagrams of zero passage detection and the interval surge detection module of zero passage in Fig. 7;
Figure 10 is the circuit theory diagrams of the second detection module in Fig. 7;
Figure 11 is the circuit theory diagrams of first detection module in Fig. 7;
Figure 12 is the circuit theory diagrams of control module in the surge checkout gear according to the electromagnetic heating system of the utility model specific embodiment;
Figure 13 is the circuit theory diagrams of the second rectification module in Fig. 7;
Figure 14 is the circuit theory diagrams of the first rectification module in Fig. 7; And
Figure 15 is the flow chart of the surge detection method of electromagnetic heating system according to the utility model embodiment.
Reference numeral:
The interval surge detection module 104 of surge checkout gear 10, resonance modules 20, first rectification module 30, IGBT pipe 40, first detection module 101, second rectification module 102, second detection module 103, zero passage detection and zero passage and, control module 105 and AC power AC;
First resistance unit 41, first electric capacity C1, the second resistance unit 42, first resistance R1, the second electric capacity C2 and the first diode D1;
3rd resistance unit 31, second resistance R2, the 3rd resistance R3, the 3rd electric capacity C3, the 4th resistance R4, the 4th resistance unit 32 and the 4th electric capacity C4;
5th resistance R5, the 5th resistance unit 11, the 5th electric capacity C5 and the second diode D2;
First comparator 51, second comparator 52, AD conversion unit 53 and control unit 54;
3rd diode D3 and the 4th diode D4;
AC/DC converting unit 301, filter inductance L30 and filter capacitor C30.
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.Be exemplary below by the embodiment be described with reference to the drawings, be intended to for explaining the utility model, and can not be interpreted as restriction of the present utility model.
Below with reference to the accompanying drawings the surge detection method of the surge checkout gear of the electromagnetic heating system that the utility model embodiment proposes, the electromagnetic heating system with this surge checkout gear and electromagnetic heating system is described.
Fig. 1 is the block diagram of the surge checkout gear of electromagnetic heating system according to the utility model embodiment.As shown in Figure 1, electromagnetic heating system comprises resonance modules 20, first rectification module 30 and IGBT pipe 40, wherein, first rectification module 30 is for converting the AC power AC of input such as civil power to first direct current to supply resonance modules 20, resonance modules 20 can comprise resonant capacitance in parallel and resonance coil, the C pole (collector electrode) of IGBT pipe 40 is connected with the output of resonance modules 20, E pole (emitter) ground connection of IGBT pipe 40.
Surge checkout gear 10 comprises: the interval surge detection module 104 of the second rectification module 102, zero passage detection and zero passage and control module 105.Wherein, the input of the second rectification module 102 is connected with the AC power AC of input, and the second rectification module 102 converts the AC power AC of input to second direct current; Zero passage detection and the interval surge detection module 104 of zero passage are connected with the output of the second rectification module 102, the interval surge detection module 104 of zero passage detection and zero passage detects the second galvanic voltage with between the zero passage state area obtaining AC power, and if in the zero passage state area of AC power in the second direct current generation surge time generation the 3rd detection signal.
Control module 105 is connected with zero passage detection and the interval surge detection module 104 of zero passage; control module 105 is also connected with the G pole (grid) of IGBT pipe 40, and control module 105 is interior in the zero passage state area of AC power AC carries out surge protection according to the 3rd detection signal to IGBT pipe 40.That is, control module 105 can receive the 3rd detection signal that the interval surge detection module 104 of zero passage detection and zero passage sends over, and can export pwm control signal according to the 3rd detection signal to IGBT pipe 40.
Particularly, in the utility model embodiment, when control module 105 pairs of IGBT pipes 40 carry out surge protection, control module 105 to the G pole output low level signal of IGBT pipe 40, can turn off with control IGBT pipe 40.
Further, according to the embodiment of Fig. 1, surge checkout gear 10 also comprises: the second detection module 103.Wherein, second detection module 103 is connected with control module 105 with the output of the second rectification module 102 respectively; second detection module 103, for detecting the second galvanic voltage to generate the second detection signal when the second direct current generation forward surge, carries out surge protection according to the second detection signal to IGBT pipe 40 when control module 105 is not for being between zero passage state area at AC power AC.That is, control module 105 can receive the second detection signal that the second detection module 103 sends over, and can export pwm control signal to the G pole of IGBT pipe 40 according to the second detection signal.
It should be noted that, when forward surge occurs, the voltage of the AC power AC after rectification can significantly rise, and namely the second galvanic voltage rises rapidly.Particularly, as shown in Figure 2, curve 2a is the second galvanic voltage waveform, curve 2b is the waveform of the G pole tension of IGBT pipe, and the change of reflection pwm control signal, when the second galvanic voltage rises rapidly, pwm control signal becomes low level from high level accordingly, turns off rapidly IGBT pipe.
Further, according to the embodiment of Fig. 1, surge checkout gear 10 also comprises: first detection module 101.Wherein, first detection module 101 is connected with control module 105 with the C pole (collector electrode) of IGBT pipe 40 respectively; first detection module 101 to generate the first detection signal when the first direct current generation negative sense surge, according to first detection signal to IGBT pipe 40 carries out surge protection when control module 105 is not for being between zero passage state area at AC power AC for the voltage that detects the C pole of IGBT pipe 40.That is, control module 105 can receive the first detection signal that first detection module 101 sends over, and can export pwm control signal to the G pole of IGBT pipe 40 according to the first detection signal.
It should be noted that, when negative sense surge occurs, the voltage of the AC power AC after rectification can significantly decline, and namely the first galvanic voltage reduces rapidly, and correspondingly, the C pole tension of IGBT pipe 40 also will reduce rapidly.Particularly, as shown in Figure 3 and Figure 4, curve 3a is the voltage waveform of the C pole of IGBT pipe, curve 3b is the waveform of the G pole tension of IGBT pipe, Fig. 4 is the waveform unfolds figure of Fig. 3, when the C pole tension of IGBT pipe declines rapidly, pwm control signal becomes low level from high level accordingly, turns off rapidly IGBT pipe.
In electromagnetic heating system heating process, when the AC power AC inputted normal (occurring without surge), control module 105 obtains the signal that the interval surge detection module 104 of first detection module 101, second detection module 103 and zero passage detection and zero passage exports, now, the interval surge detection module 104 of zero passage detection and zero passage is in zero passage detection pattern, for the mistake nought state of the AC power AC waveform after detecting rectification.
Afterwards, if control module 105 receives the first detection signal or the second detection signal and receive the non-zero cross signal that zero passage detection and the interval surge detection module 104 of zero passage send, then judge, in non-over nought state interval, negative sense or forward surge occur, control module 105 control IGBT pipe 40 turns off.
If control module 105 receives the zero cross signal of zero passage detection and interval surge detection module 104 transmission of zero passage, AC power AC waveform after then judging rectification was in nought state, now zero passage detection and the interval surge detection module 104 of zero passage are in surge detecting pattern, control module 105 shields first detection module 101 and the second detection module 103 surge detects, the signal only exported according to zero passage detection and the interval surge detection module 104 of zero passage judges whether surge occurs, thus avoid response by mistake, if control module 105 receives the 3rd detection signal, then judge, between zero passage state area, surge occurs, control IGBT pipe 40 turns off.
Thus, the surge checkout gear of the electromagnetic heating system that the utility model embodiment proposes, control module is interior in the zero passage state area of AC power carries out surge protection according to the 3rd detection signal to IGBT pipe, thus the surge realizing civil power zero passage interval detects, and according to the first detection signal and the second detection signal, surge protection is carried out to IGBT pipe when AC power is not between zero passage state area, thus the positive and negative surge realizing non-zero passage interval detects, the non-blind area surge that can realize positive and negative surge and civil power zero passage interval thus detects, surge protection reliability is higher, and this device circuit structure is simplified.
In addition, according to a specific embodiment of the present utility model, sustainable Preset Time between zero passage state area.As shown in Figure 5, curve 5a is the waveform of AC power AC, and curve 5b is the waveform of the zero passage sampled signal that the interval surge detection module 104 of zero passage detection and zero passage exports, and curve 5c is the waveform of default reference voltage, and curve 5d was the waveform of nought state.Specifically, when the voltage drop of zero passage sampled signal is to reference voltage, the waveform crossing nought state becomes low level from high level, timer in control module 105 starts timing, be between low period at the waveform crossing nought state, AC power AC is between zero passage state area, and control module 105 shields the surge measuring ability of first detection module 101 and the second detection module 103, the surge measuring ability of enable zero passage detection and the interval surge detection module 104 of zero passage.When the timing time of timer reaches Preset Time, the waveform crossing nought state becomes high level from low level, AC power AC is not between zero passage state area, the surge measuring ability of control module 105 enable first detection module 101 and the second detection module 103 again, and the zero crossing detection function of enable zero passage detection and the interval surge detection module 104 of zero passage, but forbid the surge measuring ability of zero passage detection and the interval surge detection module 104 of zero passage.Thus, surge detects without zero passage blind area.
Below the determination methods of the negative sense surge of the utility model embodiment is described in detail.
Particularly; according to an embodiment of the present utility model; in each heating harmonic period; the voltage of the C pole of multiple IGBT pipes that control module 105 detects specifically for acquisition first detection module 101; and the maximum voltage value obtained in the voltage of the C pole of multiple IGBT pipe; if the difference between the maximum voltage value of a upper heating harmonic period and the maximum voltage value of current resonance heating cycle is greater than predetermined threshold value; then control module 105 judges the first direct current generation negative sense surge, and carries out surge protection to IGBT pipe 40.
It should be noted that, the one open-one close of IGBT pipe 40 is a resonance heating cycle.As shown in Figure 6, curve 6a is the waveform of the C pole tension of IGBT pipe, and curve 6b is the drive signal waveform of the G pole of IGBT pipe, the change of the pwm control signal that reflection control module 105 exports, when pwm control signal is in high level, IGBT pipe 40 open-minded, C pole tension is close to zero; When pwm control signal is in low level, the shutoff of IGBT pipe 40, the change of C pole tension, as shown in curve 6a in Fig. 6, forms a resonance heating cycle thus.Further, as mentioned above, in each resonance heating cycle, the maximum voltage value of IGBT pipe C pole tension is present in IGBT pipe 40 blocking interval, therefore control module 105 can detect the voltage of the C pole of IGBT pipe at IGBT pipe 40 blocking interval.
Specifically, in electromagnetic heating system heating process, the voltage detecting function of enable first detection module 101, first detection module 101 reads the C pole tension of IGBT, and is saved in the data storage of control module 105.In each IGBT pipe 40 blocking interval, all read the C pole tension of IGBT pipe with predeterminated frequency, preserve the maximum voltage Un of each resonance heating cycle; When the difference that the maximum voltage Un-1 of a upper resonance heating cycle deducts the maximum voltage Un of current reading is greater than predetermined threshold value, judge negative sense surge occurs, then control module 105 turns off IGBT pipe 40, and electromagnetic heating system stops heating.
Below in conjunction with Fig. 7-Figure 14, the circuit structure of the surge checkout gear 10 of the utility model embodiment is described in detail.
According to a specific embodiment of the present utility model, as shown in figures 7 and 9, zero passage detection and the interval surge detection module 104 of zero passage comprise: the first resistance unit 41, first electric capacity C1, the second resistance unit 42, first resistance R1, the second electric capacity C2 and the first diode D1.
Wherein, one end of the first resistance unit 41 is connected with the output of the second rectification module 102, and the first electric capacity C1 is in parallel with the first resistance unit 41; One end of second resistance unit 42 is connected with the other end of the first resistance unit 41; One end of first resistance R1 is connected with the other end of the second resistance unit 42, the other end ground connection of the first resistance R1, second electric capacity C2 is in parallel with the first resistance R1, wherein, have first node between first resistance R1 and the second resistance unit 42, first node is connected with control module 105 as the output of zero passage detection and the interval surge detection module 104 of zero passage; The negative electrode of the first diode D1 is connected with the DC power supply of default power supply such as+5V, and the anode of the first diode D1 is connected with first node.
Particularly, the first resistance unit 41 can comprise two resistance of mutually connecting, and the second resistance unit 42 can comprise three resistance of mutually connecting.In addition, first node can be connected with the zerocross port of control module 105 as the output of zero passage detection and the interval surge detection module 104 of zero passage.
Further, as illustrated in fig. 7 and fig. 10, the second detection module 103 comprises: the 3rd resistance unit 31, second resistance R2, the 3rd resistance R3, the 3rd electric capacity C3, the 4th resistance R4, the 4th resistance unit 32 and the 4th electric capacity C4.
Wherein, one end of the 3rd resistance unit 31 is connected with the output of the second rectification module 102; One end of second resistance R2 is connected with the other end of the 3rd resistance unit 31; One end of 3rd resistance R3 is connected with the other end of the second resistance R2, the other end ground connection of the 3rd resistance R3, and the 3rd electric capacity C3 is in parallel with the 3rd resistance R3; One end of 4th resistance R4 is connected with the other end of the 3rd resistance unit 31 with one end of the second resistance R2 respectively, and namely one end of the 4th resistance R4 is connected with the common port of the 3rd resistance unit 31 with the second resistance R2; One end of 4th resistance unit 32 is connected with the other end of the 4th resistance R4, the other end ground connection of the 4th resistance unit 32, and the 4th electric capacity C4 is in parallel with the 4th resistance unit 32; Wherein, between second resistance R2 and the 3rd resistance R3, there is Section Point, have the 3rd node between 4th resistance R4 and the 4th resistance unit 32, Section Point is connected with control module 105 with the second output with first output of the 3rd node respectively as the second detection module 103.
Particularly, the 3rd resistance unit 31 can comprise two resistance of mutually connecting, and the 4th resistance unit 32 comprises the resistance of two series connection.In addition, Section Point can be connected with the AC port of control module 105 as the first output of the second detection module 103, and the 3rd node can be connected with the H port of control module 105 as the second output of the second detection module 103.
Further, as seen in figs. 7 and 11, first detection module 101 comprises: the 5th resistance R5, the 5th resistance unit 11, the 5th electric capacity C5 and the second diode D2.
Wherein, one end of the 5th resistance R5 is extremely connected with the C of IGBT pipe 40; One end of 5th resistance unit 11 is connected with the other end of the 5th resistance R5, the other end ground connection of the 5th resistance unit 11,5th electric capacity R5 is in parallel with the 5th resistance unit 11, wherein, have the 4th node between 5th resistance R5 and the 5th resistance unit 11, the 4th node is connected with control module 105 as the output of first detection module 101; The negative electrode of the second diode D2 is connected with the DC power supply of default power supply such as+5V, and the anode of the second diode D2 is connected with the 4th node.
Particularly, the 5th resistance unit 11 can comprise two resistance of mutually connecting, and one end of the 5th resistance R5 is extremely connected with the C of IGBT pipe 40 by the resistance Rx in the synchronous circuit of electromagnetic heating system.In addition, the 4th node can be connected with the VC port of control module 105 as the first output of first detection module 101.
According to the utility model specific embodiment, as shown in figure 12, first detection module 101 has an output, second detection module 103 has the first output and the second output, zero passage detection and the interval surge detection module 104 of zero passage have an output, and control module 105 comprises: the first comparator 51, second comparator 52, AD conversion unit 53 and control unit 54.
Wherein, the inverting input of the first comparator 51 is connected with the DC power supply of default power supply such as+5V, and the normal phase input end of the first comparator 51 is connected with the output of zero passage detection and the interval surge detection module 104 of zero passage; The inverting input of the second comparator 52 is connected with the first output of the second detection module 103, and the normal phase input end of the second comparator 52 is connected with the second output of the second detection module 103; The analog signal end of AD conversion unit 53 is connected with the output of first detection module 101, and AD conversion unit 53 is converted to digital voltage signal for the analog voltage signal detected by first detection module 101; Control unit 54 is connected with the digital signal end of AD conversion unit 53 with the output of the first comparator 51, the output of the second comparator 52 respectively.
Further, as shown in figs. 7 and 13, the AC power AC of input has the first output (live wire L) and the second output (zero line N), and the second rectification module 102 comprises: the 3rd diode D3 and the 4th diode D4.
Wherein, the anode of the 3rd diode D3 is connected with first output of AC power AC as the first input end of the second rectification module 102; The anode of the 4th diode D4 is connected with second output of AC power AC as the second input of the second rectification module 102, as the output of the second rectification module 102 after the negative electrode of the 4th diode D4 is connected with the negative electrode of the 3rd diode D3, be connected with zero passage detection and the interval surge detection module 104 of zero passage with the second detection module 103 respectively.
Further, as shown in Fig. 7 and Figure 14, the first rectification module 30 comprises AC/DC converting unit 301, filter inductance L30 and filter capacitor C30.
Wherein, the first input end of AC/DC converting unit 301 is connected with first output of AC power AC, and the second input of AC/DC converting unit 301 is connected with second output of AC power AC; One end of filter inductance L30 is connected with the first output of AC/DC converting unit 301, wherein, and the second output head grounding of AC/DC converting unit 301; One end of filter capacitor C30 is connected with the other end of filter inductance L30, the other end ground connection of filter capacitor C30, has the 5th node between filter capacitor C30 and filter inductance L30, and the 5th node is connected with the input of resonance modules 20.
As mentioned above, in electromagnetic heating system heating process, the interval surge detection module 104 of zero passage detection and zero passage can detect rectification after the mistake nought state of grid voltage waveform, if the grid voltage waveform after rectification is not between zero passage state area, the signal that then first node exports can not trigger the zero status flag excessively of the first comparator 51 output low level, and namely now the first comparator 51 exports high level.If the grid voltage waveform after rectification is between zero passage state area, then the signal of first node output is by the zero status flag excessively of triggering first comparator 51 output low level.
When not being between zero passage state area; when the AC power AC inputted normal (occurring without surge); always there is following relation in the voltage that the second detection module 103 exports: the voltage of the second output is greater than the voltage of the first output; second comparator 52 exports high level, can not the surge protection action of trigger control unit 54.When forward surge occurs; due to the 3rd electric capacity C3 and the filtering of the 4th electric capacity C4 and the effect of frequency-selecting; the voltage of the second output will be less than the voltage of the first output; second comparator 52 output low level; trigger control unit 54 produces the action of forward surge protection, and namely control unit 54 control IGBT pipe 40 turns off.
And; when not being between zero passage state area; control unit 54 obtains the magnitude of voltage of the C pole of IGBT pipe by AD conversion unit 53; when the AC power AC inputted normal (occurring without surge); difference between the maximum voltage value of a upper resonance heating cycle and the maximum voltage value of current resonance heating cycle can be less than or equal to predetermined threshold value, can not the surge protection action of trigger control unit 54.When negative sense surge occurs, the difference between the maximum voltage value of a upper resonance heating cycle and the maximum voltage value of current resonance heating cycle will be greater than predetermined threshold value, the surge protection action of trigger control unit 54.
When being in (zero cross signal that first node exports triggers the first comparator 51 and produces low level) between zero passage state area; the enable surge of control unit 54 detects Shield Flag; to shield the surge protection of the second comparator 52 in zero passage state area; prevent the response by mistake of the second comparator 52, make the surge protection of the second comparator 52 interior inoperative in zero passage state area.Simultaneously; the surge measuring ability of enable first comparator 51 of control unit 54; when there is surge in zero passage state area; due to the frequency-selecting effect of the first electric capacity C1; two resistance in first resistance unit 41 are by instantaneous short circuit; the voltage of first node raises rapidly; the normal phase input end voltage of the first comparator 51 is greater than the anti-phase input terminal voltage of the first comparator 51; first comparator 51 exports high level; produce surge triggering signal and export to control unit 54; control unit 54 turns off IGBT pipe 40, realizes surge protection.
Thus, the surge checkout gear 10 of the utility model embodiment can realize the non-blind area surge detection in positive and negative surge and civil power zero passage interval, make surge protection more comprehensively reliable, and this device circuit structure is simplified.
In addition, the utility model also proposed a kind of electromagnetic heating system, comprises the surge checkout gear of the electromagnetic heating system of above-described embodiment.
According to the electromagnetic heating system that the utility model embodiment proposes, by the surge checkout gear of above-mentioned electromagnetic heating system, the non-blind area surge that can realize positive and negative surge and civil power zero passage interval detects, and makes surge protection more comprehensively reliable.
Based on above-described embodiment, the utility model also been proposed a kind of surge detection method of electromagnetic heating system.
Figure 15 is the flow chart of the surge detection method of electromagnetic heating system according to the utility model embodiment.Electromagnetic heating system comprises the first rectification module, resonance modules, IGBT pipe and the second rectification module, first rectification module is used for converting the AC power of input to first direct current to supply resonance modules, and the second rectification module is used for converting the AC power of input to second direct current.As shown in figure 15, should, surge detection method comprises the following steps:
S1: detect the second galvanic voltage with between the zero passage state area obtaining AC power, and if in the zero passage state area of AC power in the second direct current generation surge time generation the 3rd detection signal.
S2: according to the 3rd detection signal, surge protection is carried out to IGBT pipe in the zero passage state area of AC power.
Thus; the surge detection method of the electromagnetic heating system that the utility model embodiment proposes; according to the 3rd detection signal, surge protection is carried out to IGBT pipe in the zero passage state area of AC power, thus the surge realizing civil power zero passage interval detects, make surge protection more comprehensively reliable.
Further, according to an embodiment of the present utility model, the surge detection method of electromagnetic heating system also comprises: detect the second galvanic voltage to generate the second detection signal when the second direct current generation forward surge; According to the second detection signal, surge protection is carried out to IGBT pipe when AC power is not between zero passage state area.
Further, according to an embodiment of the present utility model, the surge detection method of electromagnetic heating system also comprises: the voltage detecting the C pole of IGBT pipe is to generate the first detection signal when the first direct current generation negative sense surge; According to the first detection signal, surge protection is carried out to IGBT pipe when AC power is not between zero passage state area.
According to a specific embodiment of the present utility model, in each control cycle, carry out surge protection according to the first detection signal to IGBT pipe specifically to comprise: the voltage obtaining the C pole of the multiple described IGBT pipe that described first detection module detects, and obtain the maximum voltage value in the voltage of the C pole of described multiple IGBT pipe; If the difference between the maximum voltage value of a upper control cycle and the maximum voltage value of current control period is greater than predetermined threshold value, then judges described first direct current generation negative sense surge, and surge protection is carried out to described IGBT pipe.
Thus; the surge detection method of the electromagnetic heating system that the utility model embodiment proposes; according to the 3rd detection signal, surge protection is carried out to IGBT pipe in the zero passage state area of AC power; thus the surge realizing civil power zero passage interval detects; and according to the first detection signal and the second detection signal, surge protection is carried out to IGBT pipe when AC power is not between zero passage state area; thus the positive and negative surge realizing non-zero passage interval detects; the non-blind area surge that can realize positive and negative surge and civil power zero passage interval thus detects, and makes surge protection more comprehensively reliable.
In description of the present utility model, it will be appreciated that, term " " center ", " longitudinal direction ", " transverse direction ", " length ", " width ", " thickness ", " on ", D score, " front ", " afterwards ", " left side ", " right side ", " vertically ", " level ", " top ", " end " " interior ", " outward ", " clockwise ", " counterclockwise ", " axis ", " radial direction ", orientation or the position relationship of the instruction such as " circumference " are based on orientation shown in the drawings or position relationship, only the utility model and simplified characterization for convenience of description, instead of indicate or imply that the device of indication or element must have specific orientation, with specific azimuth configuration and operation, therefore can not be interpreted as restriction of the present utility model.
In addition, term " first ", " second " only for describing object, and can not be interpreted as instruction or hint relative importance or imply the quantity indicating indicated technical characteristic.Thus, be limited with " first ", the feature of " second " can express or impliedly comprise at least one this feature.In description of the present utility model, the implication of " multiple " is at least two, such as two, three etc., unless otherwise expressly limited specifically.
In the utility model, unless otherwise clearly defined and limited, the term such as term " installation ", " being connected ", " connection ", " fixing " should be interpreted broadly, and such as, can be fixedly connected with, also can be removably connect, or integral; Can be mechanical connection, also can be electrical connection; Can be directly be connected, also indirectly can be connected by intermediary, can be the connection of two element internals or the interaction relationship of two elements, unless otherwise clear and definite restriction.For the ordinary skill in the art, the concrete meaning of above-mentioned term in the utility model can be understood as the case may be.
In the utility model, unless otherwise clearly defined and limited, fisrt feature second feature " on " or D score can be that the first and second features directly contact, or the first and second features are by intermediary indirect contact.And, fisrt feature second feature " on ", " top " and " above " but fisrt feature directly over second feature or oblique upper, or only represent that fisrt feature level height is higher than second feature.Fisrt feature second feature " under ", " below " and " below " can be fisrt feature immediately below second feature or tiltedly below, or only represent that fisrt feature level height is less than second feature.
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, to the schematic representation of above-mentioned term not must for be identical embodiment or example.And the specific features of description, structure, material or feature can combine in one or more embodiment in office or example in an appropriate manner.In addition, when not conflicting, the feature of the different embodiment described in this specification or example and different embodiment or example can carry out combining and combining by those skilled in the art.
Although illustrate and described embodiment of the present utility model above, be understandable that, above-described embodiment is exemplary, can not be interpreted as restriction of the present utility model, those of ordinary skill in the art can change above-described embodiment, revises, replace and modification in scope of the present utility model.
Claims (9)
1. the surge checkout gear of an electromagnetic heating system, it is characterized in that, described electromagnetic heating system comprises IGBT pipe, resonance modules and for the AC power of input being converted to the first direct current to supply the first rectification module of described resonance modules, and described surge checkout gear comprises:
Second rectification module, the input of described second rectification module is connected with the AC power of described input, and described second rectification module converts the AC power of described input to second direct current;
Zero passage detection and the interval surge detection module of zero passage, described zero passage detection and the interval surge detection module of zero passage are connected with the output of described second rectification module, the interval surge detection module of described zero passage detection and zero passage detects described second galvanic voltage with between the zero passage state area obtaining described AC power, and if in the zero passage state area of described AC power in described second direct current generation surge time generate the 3rd detection signal;
Control module, described control module is connected with described zero passage detection and the interval surge detection module of zero passage, and described control module is interior in the zero passage state area of described AC power carries out surge protection according to described 3rd detection signal to described IGBT pipe.
2. the surge checkout gear of electromagnetic heating system as claimed in claim 1, is characterized in that, also comprise:
Second detection module; described second detection module is connected with described control module with the output of described second rectification module respectively; described second detection module detects described second galvanic voltage to generate the second detection signal when described second direct current generation forward surge; wherein, described control module is used for carrying out surge protection according to described second detection signal to described IGBT pipe when described AC power is not between described zero passage state area.
3. the surge checkout gear of electromagnetic heating system as claimed in claim 2, is characterized in that, also comprise:
First detection module; described first detection module is connected with described control module with the C pole of described IGBT pipe respectively; the voltage that described first detection module detects the C pole of described IGBT pipe is to generate the first detection signal when described first direct current generation negative sense surge; wherein, described control module is used for carrying out surge protection according to described first detection signal to described IGBT pipe when described AC power is not between described zero passage state area.
4. the surge checkout gear of electromagnetic heating system as claimed in claim 1, is characterized in that, described zero passage detection and the interval surge detection module of zero passage, comprising:
First resistance unit and the first electric capacity, one end of described first resistance unit is connected with the output of described second rectification module, and described first electric capacity is in parallel with described first resistance unit;
Second resistance unit, one end of described second resistance unit is connected with the other end of described first resistance unit;
First resistance and the second electric capacity, one end of described first resistance is connected with the other end of described second resistance unit, the other end ground connection of described first resistance, described second electric capacity and described first resistor coupled in parallel, wherein, have first node between described first resistance and described second resistance unit, described first node is connected with described control module as the output of described zero passage detection and the interval surge detection module of zero passage; And
First diode, the negative electrode of described first diode is connected with default power supply, and the anode of described first diode is connected with described first node.
5. the surge checkout gear of electromagnetic heating system as claimed in claim 2, it is characterized in that, described second detection module, comprising:
3rd resistance unit, one end of described 3rd resistance unit is connected with the output of described second rectification module;
Second resistance, one end of described second resistance is connected with the other end of described 3rd resistance unit;
3rd resistance and the 3rd electric capacity, one end of described 3rd resistance is connected with the other end of described second resistance, the other end ground connection of described 3rd resistance, described 3rd electric capacity and described 3rd resistor coupled in parallel;
4th resistance, one end of described 4th resistance is connected with the other end of described 3rd resistance unit with one end of described second resistance respectively;
4th resistance unit and the 4th electric capacity, one end of described 4th resistance unit is connected with the other end of described 4th resistance, the other end ground connection of described 4th resistance unit, and described 4th electric capacity is in parallel with described 4th resistance unit;
Wherein, between described second resistance and described 3rd resistance, there is Section Point, have the 3rd node between described 4th resistance and described 4th resistance unit, described Section Point is connected with described control module with the second output with first output of described 3rd node respectively as described second detection module.
6. the surge checkout gear of electromagnetic heating system as claimed in claim 3, it is characterized in that, described first detection module, comprising:
5th resistance, one end of described 5th resistance is extremely connected with the C of described IGBT pipe;
5th resistance unit and the 5th electric capacity, one end of described 5th resistance unit is connected with the other end of described 5th resistance, the other end ground connection of described 5th resistance unit, described 5th electric capacity is in parallel with described 5th resistance unit, wherein, have the 4th node between described 5th resistance and described 5th resistance unit, described 4th node is connected with described control module as the output of described first detection module; And
Second diode, the negative electrode of described second diode is connected with default power supply, and the anode of described second diode is connected with described 4th node.
7. the surge checkout gear of electromagnetic heating system as claimed in claim 3, it is characterized in that, described control module comprises:
First comparator, the inverting input of described first comparator is connected with default power supply, and the normal phase input end of described first comparator is connected with the output of described zero passage detection and the interval surge detection module of zero passage;
Second comparator, the inverting input of described second comparator is connected with the first output of described second detection module, and the normal phase input end of described second comparator is connected with the second output of described second detection module;
AD conversion unit, the analog signal end of described AD conversion unit is connected with the output of described first detection module; And
Control unit, described control unit is connected with the digital signal end of described AD conversion unit with the output of described first comparator, the output of described second comparator respectively.
8. the surge checkout gear of electromagnetic heating system as claimed in claim 2, it is characterized in that, described AC power has the first output and the second output, and described second rectification module comprises:
3rd diode, the described anode of the 3rd diode is connected with the first output of described AC power; And
4th diode, the described anode of the 4th diode is connected with the second output of described AC power, is connected respectively after the negative electrode of described 4th diode is connected with the negative electrode of described 3rd diode with described second detection module with zero passage detection and the interval surge detection module of zero passage.
9. an electromagnetic heating system, is characterized in that, comprises the surge checkout gear of the electromagnetic heating system according to any one of claim 1-8.
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| CN201520622387.4U CN205029898U (en) | 2015-08-18 | 2015-08-18 | Electromagnetic heating system and surge detection device thereof |
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| CN201520622387.4U CN205029898U (en) | 2015-08-18 | 2015-08-18 | Electromagnetic heating system and surge detection device thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105605628A (en) * | 2016-03-30 | 2016-05-25 | 广东美的厨房电器制造有限公司 | Surge suppression circuit and microwave oven |
| CN106470507A (en) * | 2015-08-18 | 2017-03-01 | 佛山市顺德区美的电热电器制造有限公司 | Electromagnetic heating system and its surge detection means |
-
2015
- 2015-08-18 CN CN201520622387.4U patent/CN205029898U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106470507A (en) * | 2015-08-18 | 2017-03-01 | 佛山市顺德区美的电热电器制造有限公司 | Electromagnetic heating system and its surge detection means |
| CN106470507B (en) * | 2015-08-18 | 2023-04-28 | 佛山市顺德区美的电热电器制造有限公司 | Electromagnetic heating system and surge detection device thereof |
| CN105605628A (en) * | 2016-03-30 | 2016-05-25 | 广东美的厨房电器制造有限公司 | Surge suppression circuit and microwave oven |
| CN105605628B (en) * | 2016-03-30 | 2018-06-19 | 广东美的厨房电器制造有限公司 | Surge restraint circuit and micro-wave oven |
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