CN201323447Y - Voltage and current surge protection circuit for electromagnetic oven - Google Patents
Voltage and current surge protection circuit for electromagnetic oven Download PDFInfo
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- CN201323447Y CN201323447Y CNU2008202349799U CN200820234979U CN201323447Y CN 201323447 Y CN201323447 Y CN 201323447Y CN U2008202349799 U CNU2008202349799 U CN U2008202349799U CN 200820234979 U CN200820234979 U CN 200820234979U CN 201323447 Y CN201323447 Y CN 201323447Y
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Abstract
The utility model discloses a voltage and current surge protection circuit for an electromagnetic oven, which comprises a voltage surge detecting circuit consisting of a first comparator and a surge voltage sampler, a current surge detecting circuit consisting of a second comparator and a surge voltage current sampler, an OR logic circuit and an IGBT drive control module. A control end and an input end of the module are respectively connected with the output end of the OR logic circuit and the pulse signal output terminal of a CPU, and the output end of the OR logic circuit is connected with an input end of the CPU. When a surge voltage signal and/or a surge current signal is captured, the IGBT drive control module is directly shut off after the surge voltage signal and/or the surge current signal is processed by the OR logic circuit; and at the same time, the surge voltage signal and/or the surge current signal is sent to the CPU which then turns off the output impulse thereof and monitors the surge signal. After the surge signal disappears, the IGBT drive control module is started up in a delay manner. The surge protection circuit has high capture speed for the surge signal and good protection effect, and also avoids the defect of the conventional electromagnetic oven that when a little bit amount of surge pulse signals appear in the power network of the electromagnetic oven, the IGBT has to be shut off frequently, which results in that that the electromagnetic oven can not work normally.
Description
Technical field
The utility model belongs to the electromagentic furnace technology field with the electric energy heating, particularly a kind of electromagnetic oven voltage and current surge protective circuit.
Background technology
The current surge protective circuit of current common electromagnetic oven adopts the current transformer mode more; be connected in the alternating current current transformer is elementary; when current surge takes place; the current transformer secondary induction goes out voltage jump; detect surging signal through rectifier etc.; undertaken after voltage ratio judges by comparator again, directly or close the IGBT power output of electromagnetic oven by CPU.This mode needs current transformer, rectifier etc., more complicated, and the current surge signal had certain time-delay, the protection effect owes desirable.
The surge protection circuit of common electromagnetic oven, its principle are to capture voltage surge pulse signal on the electrical network by sampling, close the output of IGBT power at once, thereby reach the protection effect.But owing to be subjected to electromagnetic interference, component parameter error or the like factor affecting in the electromagnetic oven, bad to the consistency that surge intensity is judged, it protects poor effect.For example: in the electromagnetic oven of batch process, some product should not protect frequent protection to close the IGBT driver when electrical network a little moderate seas occurs and gushes pulse signal originally, cause electromagnetic oven normally power output heat.The output of IGBT power but can not in time be caught and close to some product when electrical network occurs that very high seas are gushed pulse signal.
Summary of the invention
Be the above-mentioned defective of avoiding existing electromagnetic oven to exist; the utility model provides a kind of electromagnetic oven voltage and current surge protective circuit; it detects the voltage surge pulse signal of the alternating current that inserts electromagnetic oven and the current surge pulse signal in the output major loop, provides voltage, current surge protection by an IGBT drive control module and CPU to the electromagnetic oven system.
The utility model electromagnetic oven is following realization with voltage and current surge protective circuit.It comprises:
One voltage surge testing circuit, this testing circuit comprise first comparator and gather the surge voltage sample circuit of the surge voltage signal of input ac power, and the output signal of this surge voltage sample circuit connects the in-phase input end of first comparator;
One current surge testing circuit, this testing circuit comprises second comparator, and, by being connected on the current sampling resistor between rectifier bridge and the IGBT and being connected in the surge current sample circuit that two divider resistances of this current sampling resistor constitute, the output signal of this surge current sample circuit connects the inverting input of described second comparator, the in-phase input end ground connection of second comparator;
One or logical circuit, should or two inputs of logical circuit connect the output of described first comparator and the output of second comparator respectively; And,
One IGBT drive control module, a control end of this IGBT drive control module, input connect the output of described or logical circuit and the pulse signal output end of CPU respectively, and described CPU one input of the output termination of described or logical circuit; When capturing surge voltage and/or current signal, warp or logical circuit are handled directly, and the described IGBT drive control module of shutoff stops output pulse signal, send into CPU simultaneously, CPU turn-offs its pulse signal output, and monitoring surge voltage and/or current signal are treated the surge back time-delay 0.5～2.5 second that disappears, provide pulse signal to the IGBT drive control module again, and then promote IGBT work by a driver.
Wherein, described first comparator, second comparator or logical circuit, IGBT drive control module and CPU all are integrated in a SoC (the System on a Chip) chip.
Described SoC chip preferably adopts the CHK-S008 type SoC chip of 16PIN encapsulation.
The utility model electromagnetic circuit can be caught the voltage and current surging signal fast with voltage and current surge protective circuit; when capturing surge voltage and/or current signal; warp or logical circuit processing hardware are directly turn-offed the IGBT drive control module and are stopped output pulse signal; CPU turn-offs its pulse signal output simultaneously; and monitor surging signal and treat the certain hour of delaying time after surge disappears, restart IGBT work.Protect effectively, avoided traditional electromagnetic oven simultaneously when electrical network a little moderate seas occurs and gushes pulse signal, frequently close IGBT, cause the normally drawback of power output heating of electromagnetic oven.
By adjusting the voltage ratio of two divider resistances in the surge current sample circuit; can set the surge current threshold values of protection; the parameter side of setting makes flexibly; circuit reduction; diode D3 in its surge voltage sample circuit and capacitor C 13 are provided with; the filtering environmental noise there is obvious effect; help distinguishing environment noise and surge voltage signal; effectively improved the signal to noise ratio of sample circuit; the intensity of can be more reliable, accurate recognition voltage surge, thus electromagnetic oven is played the better protection effect.
It is based on the SoC chip technology, and some comparators or logical circuit, IGBT drive control module and CPU are not vulnerable to external disturbance in the sheet, and peripheral circuit is simple, greatly reduces production, maintenance difficulty and cost.
Description of drawings
Fig. 1 is the utility model electromagnetic oven voltage and current surge protective circuit theory diagram;
Fig. 2 is protective circuit one an exemplary embodiments circuit diagram shown in Figure 1.
Embodiment
Below in conjunction with accompanying drawing the utility model is further specified.
With reference to Fig. 1, shown in electromagnetic oven mainly comprise with voltage and current surge protective circuit:
The voltage surge testing circuit comprises comparator 1 and gathers the surge voltage sample circuit of the surge voltage signal of input ac power, and the output signal of this surge voltage sample circuit connects the in-phase input end of first comparator;
The current surge testing circuit, this circuit comprises second comparator, and, by being connected on the current sampling resistor between rectifier bridge and the IGBT and being connected in the surge current sample circuit that two divider resistances of this current sampling resistor constitute, the output signal of this surge current sample circuit connects the inverting input of comparator 2, the in-phase input end ground connection of comparator 2; And,
One or logical circuit, should or two inputs of logical circuit connect the output of described first comparator and the output of second comparator respectively; And,
One IGBT drive control module, a control end of this IGBT drive control module, input connect the output of described or logical circuit and the pulse signal output end of CPU respectively, and described CPU one input of the output termination of described or logical circuit.
Wherein, comparator 1, comparator 2 or logical circuit, IGBT drive control module and CPU all are integrated in the SoC chip, and this SoC chip is the CHK-S008 type SoC chip of 16PIN encapsulation preferably.
Described or logical circuit can be made up of one 2 input NOR gate and the inverter that is connected in this 2 input NOR gate output, also can adopt one 2 input or.
The IGBT drive control module also is provided with another control end and a feedback end, can feed back to IGBT drive control module inside by the pulse signal that a feedback circuit is exported the IGBT drive control module revises the IGBT drive waveforms, optimize pulse signal waveform, increase work efficiency.
Exemplary embodiments is seen Fig. 2, and this embodiment has promptly adopted above-mentioned CHK-S008 type SoC chip, and comparator 1, comparator 2,2 input OR circuit, IGBT drive control module and CPU etc. all are built in the CHK-S008 type SoC chip.Wherein, filter is made up of inductor L1 and capacitor C 4, and IGBT and LC resonant tank (L3 and C3) are formed power inversion circuit.
Comparator 1 in the CHK-S008 type SoC chip and surge voltage sample circuit are formed the voltage surge testing circuit, and the output signal of surge voltage sample circuit connects the in-phase input end (1PIN) of this comparator 1.
The surge voltage sample circuit comprises anodal diode D1, the D2 that rectifier bridge BG1 exchanges incoming line that connect respectively, the diode D3 of cathode connecting diode D1, D2 negative pole, be connected in the negative pole of diode D3 and the series resistance R19 between the ground, R20, R21, resistance R 20, R21 be shunt capacitance C14, C15 respectively, the negative pole of diode D3 is by capacitor C 13 ground connection, the common port output sampled signal of resistance R 20, R21 connects the in-phase input end of described comparator 1, and the inverting input of described comparator 1 connects reference voltage Vref.The diode D3 of this circuit and capacitor C 13 are provided with, and filtering environmental is disturbed obvious effect, helps distinguishing environment noise and surge voltage signal.When capturing the surge voltage signal, described comparator 1 output high level by described 2 input OR circuit, is received a control end and CPU one input of described IGBT drive control module, directly turn-off described IGBT drive control module and stop output pulse signal, protection IGBT safety; CPU receives that the voltage surge signal turn-offs its pulse signal output simultaneously, and monitoring surge voltage signal is treated to delay time 0.5～2.5 second after surge disappears, provide pulse signal to the IGBT drive control module again, and then promote IGBT work by a driver that is connected in the IGBT grid.
Comparator 2 in the CHK-S008 type SoC chip and surge current sample circuit are formed the current surge testing circuit, and the output signal of surge voltage sample circuit connects the inverting input (11PIN) of described comparator 2, in-phase input end ground connection.
The surge current sample circuit is made of with two divider resistance R11, R10 being connected in this constantan wire resistance R K1 the constantan wire resistance R K1 that is connected between rectifier bridge BG1 and the IGBT drain electrode, resistance R 11 shunt capacitance C4, the termination power Vcc+5V of R10, the output signal of surge current sample circuit connects the inverting input of described comparator 2, the in-phase input end ground connection GND of comparator 2.Constantan wire resistance R K1 is connected between rectifier bridge BG1 and the IGBT drain electrode, and constantan wire resistance R K1 both end voltage also can respective change when the electromagnetic oven electric current changed, and the capacitor C 4 that is parallel to R11 mainly plays the filtering noise information effect.Electromagnetic oven normal heating state, when operating current was lower than the maximum limit definite value, the end of oppisite phase voltage of comparator 2 was greater than in-phase end; When the electromagnetic oven electric current increases suddenly, comparator 2 end of oppisite phase voltages descend suddenly, when being lower than its in-phase end level GND, comparator 2 output high level, by described 2 input OR circuit, connect a control end and CPU one input of described IGBT drive control module, directly turn-off described IGBT drive control module and stop output pulse signal, protection IGBT safety; CPU receives that the voltage surge signal turn-offs its pulse signal output simultaneously, and monitoring surge voltage signal is treated to delay time 0.5～2.5 second after surge disappears, provide pulse signal to the IGBT drive control module again, and then promote IGBT work by a driver that is connected in the IGBT grid.
Claims (7)
1, a kind of electromagnetic oven voltage and current surge protective circuit is characterized in that comprising:
One voltage surge testing circuit, this testing circuit comprise first comparator and gather the surge voltage sample circuit of the surge voltage signal of input ac power, and the output signal of this surge voltage sample circuit connects the in-phase input end of first comparator;
One current surge testing circuit, this testing circuit comprises second comparator, and, by being connected on the current sampling resistor between rectifier bridge and the IGBT and being connected in the surge current sample circuit that two divider resistances of this current sampling resistor constitute, the output signal of this surge current sample circuit connects the inverting input of described second comparator, the in-phase input end ground connection of second comparator;
One or logical circuit, should or two inputs of logical circuit connect the output of described first comparator and the output of second comparator respectively; And,
One IGBT drive control module, a control end of this IGBT drive control module, input connect the output of described or logical circuit and the pulse signal output end of CPU respectively, and described CPU one input of the output termination of described or logical circuit; When capturing surge voltage and/or current signal, warp or logical circuit are handled and are directly turn-offed described IGBT drive control module, send into CPU simultaneously, and CPU turn-offs its pulse signal output and monitoring surging signal.
2, according to the electromagnetic oven voltage and the current surge protective circuit of claim 1, it is characterized in that: described first comparator, second comparator or logical circuit, IGBT drive control module and CPU all are integrated in the SoC chip.
3, according to the voltage and current surge protection circuit of the electromagnetic oven of claim 1 or 2, it is characterized in that: described or logical circuit is 2 inputs or door.
4, according to the electromagnetic oven voltage and the current surge protective circuit of claim 1 or 2, it is characterized in that. described or logical circuit is made up of with the inverter that is connected in this 2 input NOR gate output one 2 input NOR gate.
5, according to the electromagnetic oven voltage and the current surge protective circuit of claim 2, it is characterized in that: described SoC chip is the CHK-S008 type SoC chip of 16PIN encapsulation.
6, according to the electromagnetic oven of claim 1 with voltage and current surge protective circuit; it is characterized in that: described surge voltage sample circuit comprises anodal diode D1, the D2 that rectifier bridge two exchanges incoming line that connect respectively; the diode D3 of cathode connecting diode D1, D2 negative pole; be connected in the negative pole of diode D3 and the series resistance R19 between the ground, R20, R21; resistance R 20, R21 be an electric capacity in parallel respectively; the negative pole of diode D3 is by another capacity earth, and the common port output signal of resistance R 20, R21 connects the in-phase input end of first comparator in the described SoC chip slapper.
7, according to the electromagnetic oven of claim 1 or 6 with voltage and current surge protective circuit; it is characterized in that: described surge current sample circuit comprises that two divider resistance R11, R10 being connected on the constantan wire resistance R K1 between rectifier bridge and the IGBT drain electrode and being connected in this constantan wire resistance R K1 constitute; its output signal connects the inverting input of described second comparator, the in-phase input end ground connection of second comparator.
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| Application Number | Priority Date | Filing Date | Title |
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| CNU2008202349799U CN201323447Y (en) | 2008-12-12 | 2008-12-12 | Voltage and current surge protection circuit for electromagnetic oven |
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| CNU2008202349799U CN201323447Y (en) | 2008-12-12 | 2008-12-12 | Voltage and current surge protection circuit for electromagnetic oven |
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| CN201323447Y true CN201323447Y (en) | 2009-10-07 |
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| CNU2008202349799U Expired - Fee Related CN201323447Y (en) | 2008-12-12 | 2008-12-12 | Voltage and current surge protection circuit for electromagnetic oven |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2010066096A1 (en) * | 2008-12-12 | 2010-06-17 | 深圳市鑫汇科科技有限公司 | Voltage and current surge protective method and its circuit for induction cooker |
| CN102263402A (en) * | 2010-05-31 | 2011-11-30 | 研祥智能科技股份有限公司 | Over-current protection circuit and over-current protection method for DC power supply |
| WO2012152025A1 (en) * | 2011-07-21 | 2012-11-15 | 中兴通讯股份有限公司 | Power source module and power supply system |
| CN103718407A (en) * | 2011-03-24 | 2014-04-09 | 爱立信(中国)通信有限公司 | Method and arrangement for reducing in-rush current of multi-module system |
| CN107528289A (en) * | 2016-06-20 | 2017-12-29 | 佛山市顺德区美的电热电器制造有限公司 | Electromagnetic heating system and its protection device |
| CN113612194A (en) * | 2021-08-20 | 2021-11-05 | 苏州裕太微电子有限公司 | Surge protection circuit of Ethernet PHY chip |
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2008
- 2008-12-12 CN CNU2008202349799U patent/CN201323447Y/en not_active Expired - Fee Related
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2010066096A1 (en) * | 2008-12-12 | 2010-06-17 | 深圳市鑫汇科科技有限公司 | Voltage and current surge protective method and its circuit for induction cooker |
| CN101752845B (en) * | 2008-12-12 | 2012-07-04 | 深圳市鑫汇科科技有限公司 | Voltage and current surge protection method for electromagnetic oven and circuit thereof |
| CN102263402A (en) * | 2010-05-31 | 2011-11-30 | 研祥智能科技股份有限公司 | Over-current protection circuit and over-current protection method for DC power supply |
| CN102263402B (en) * | 2010-05-31 | 2014-11-05 | 研祥智能科技股份有限公司 | Over-current protection circuit and over-current protection method for DC power supply |
| CN103718407A (en) * | 2011-03-24 | 2014-04-09 | 爱立信(中国)通信有限公司 | Method and arrangement for reducing in-rush current of multi-module system |
| WO2012152025A1 (en) * | 2011-07-21 | 2012-11-15 | 中兴通讯股份有限公司 | Power source module and power supply system |
| CN107528289A (en) * | 2016-06-20 | 2017-12-29 | 佛山市顺德区美的电热电器制造有限公司 | Electromagnetic heating system and its protection device |
| CN107528289B (en) * | 2016-06-20 | 2020-04-03 | 佛山市顺德区美的电热电器制造有限公司 | Electromagnetic heating system and protection device thereof |
| CN113612194A (en) * | 2021-08-20 | 2021-11-05 | 苏州裕太微电子有限公司 | Surge protection circuit of Ethernet PHY chip |
| CN113612194B (en) * | 2021-08-20 | 2024-01-12 | 裕太微电子股份有限公司 | Surge protection circuit of Ethernet PHY chip |
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20091007 Termination date: 20121212 |