CN205657859U - Drive circuit and electromagnetic heating device - Google Patents

Drive circuit and electromagnetic heating device Download PDF

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Publication number
CN205657859U
CN205657859U CN201620295051.6U CN201620295051U CN205657859U CN 205657859 U CN205657859 U CN 205657859U CN 201620295051 U CN201620295051 U CN 201620295051U CN 205657859 U CN205657859 U CN 205657859U
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China
Prior art keywords
audion
circuit
level
resistance
outfan
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CN201620295051.6U
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曾露添
王云峰
江德勇
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Foshan Shunde Midea Electrical Heating Appliances Manufacturing Co Ltd
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Foshan Shunde Midea Electrical Heating Appliances Manufacturing Co Ltd
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Abstract

The utility model discloses a drive circuit for drive electromagnetic heating device's switch tube, drive circuit includes level shifting circuit and third level voltage generation circuit. It is the high level output of second that level shifting circuit is used for the first high level conversion with the pulsewidth modulation control signal of controller production, and the second high level is used for drive switching tube work at the saturated conduction state. Enable signal that third level voltage generation circuit is used for producing when the electromagnetic heating device low -power heats according to the controller be the third high level with the high level conversion of second that pulsewidth modulation control signal's rising edge corresponds, and the third high level is used for drive switching tube to work at enlarged state. The utility model provides an electromagnetic heating device. The utility model discloses a drive circuit and electromagnetic heating device can avoid the current rush to produce electromagnetic interference and lengthen device life.

Description

Drive circuit and electromagnetic heater
Technical field
This utility model relates to living electric apparatus field, particularly to a kind of drive circuit and electromagnetic heater.
Background technology
At present, during the heating of electromagnetic oven low-power, owing to LC resonance circuit does not has enough energy to make insulated gate bipolar The collector voltage of transistor (Insulated Gate Bipolar Transistor, IGBT) drops to zero, and is maintained at Between 100-200 volt, cause IGBT to be in hard open state, and then when causing IGBT to turn on, produce current rush.Impulse On the one hand electric current produces the strongest electromagnetic interference, and other electronic components affecting electromagnetic oven normally work, and on the other hand makes IGBT and LC resonance circuit works beyond range of safety operation, is easily damaged.
Utility model content
This utility model is intended at least to solve one of technical problem present in prior art.To this end, this utility model provides A kind of drive circuit and electromagnetic heater.
The drive circuit of this utility model embodiment includes:
Level shifting circuit, described level shifting circuit is connected with the controller of described electromagnetic heater, described controller For producing pwm control signal, described pwm control signal includes the first high level, and described level shifting circuit is used In described first high level is converted to the second high level output, described second high level is used for driving described switching tube to work In saturation conduction state;And
3rd level voltage produces circuit, and the input that described 3rd level voltage produces circuit is connected with described controller, The outfan that described 3rd level voltage produces circuit is connected with the outfan of described level shifting circuit, and described controller is used Enabling signal in producing when described electromagnetic heater low-power heats, described 3rd level voltage produces circuit for root According to described enable signal, described second high level corresponding for the rising edge of described pwm control signal is converted to three-hypers electricity Flat, described 3rd high level is used for driving described switching tube to be operated in magnifying state.
In some embodiments, described pwm control signal includes that low level, described level shifting circuit are used for exporting Described low level;
Described drive circuit also includes:
Push-pull output circuit, the input of described push-pull output circuit is connected with the outfan of described level shifting circuit, uses Low ESR is converted to by high impedance in the described low level exported by described level shifting circuit and described second high level.
In some embodiments, described controller includes signal output part and Enable Pin, and described signal output part is for defeated Going out described pwm control signal, described Enable Pin is used for exporting described enable signal;
Described push-pull output circuit includes that the second high level power supply, described second high level power supply are used for providing described second height Level;
RC parallel circuit that described level shifting circuit includes being made up of the first resistance and the first electric capacity, the first audion and Second audion, described first audion and described second audion are NPN type triode, described first audion Base stage is connected with described signal output part by described RC parallel circuit, and the colelctor electrode of described first audion passes through second Resistance is connected with described second electrical level power supply, the grounded emitter of described first audion, the base stage of described second audion Being connected with the colelctor electrode of described first audion, the colelctor electrode of described second audion is by the 3rd resistance and described second electricity Ordinary telegram source connects, the grounded emitter of described second audion, the most described level conversion of current collection of described second audion The outfan of circuit.
In some embodiments, described push-pull output circuit includes the 3rd audion and the 4th audion, the described 3rd 3 Pole pipe is NPN type triode, and described 4th audion is PNP type triode;
The base stage of described 3rd audion is connected with the colelctor electrode of described second audion, the colelctor electrode of described 3rd audion It is connected with described second high level power supply by the 4th resistance, the base stage of described 4th audion and described second audion Colelctor electrode connects, the grounded collector of described 4th audion, and the emitter stage and the described 3rd 3 of described 4th audion The emitter stage of pole pipe connects.
In some embodiments, described drive circuit includes:
Gate pole protection circuit, described gate pole protection circuit is connected with the grid of described push-pull output circuit and described switching tube, For ensureing that described low level and described second high level are in the safe operating voltage of the grid of described switching tube.
In some embodiments, described gate pole protection circuit include being arranged in series in the emitter stage of described 3rd audion with The 5th resistance between ground and the 6th resistance and the stabilivolt arranged with described 6th resistor coupled in parallel, wherein, described 5th electricity One end of resistance is connected with the emitter stage of described 3rd audion, and the other end is connected with one end of described 6th resistance, and described the The other end ground connection of six resistance.
In some embodiments, described 3rd level voltage produces circuit and includes:
Delay circuit, described delay circuit includes the 11st resistance R being arranged in series between described signal output part and ground And the 11st electric capacity, wherein, described 11st resistance one end is connected with described signal output part, the other end and the described tenth One end of one electric capacity connects, the other end ground connection of described 11st electric capacity;
Comparison circuit, described comparison circuit includes comparator, the 12nd resistance, the 13rd resistance and reference voltage source, institute State reference voltage source to be connected with the normal phase input end of described comparator by described 12nd resistance, described 13rd resistance 3 Being connected between normal phase input end and the ground of described comparator, described signal output part passes through described 11st resistance with described The inverting input of comparator connects;
Control circuit, described control circuit includes the 14th resistance, and described Enable Pin passes through described 14th resistance with described The outfan of comparator connects;
Output circuit, described output circuit includes that the 11st audion and the 15th resistance, described 11st audion are NPN audion, the described base stage of the 11st audion is connected with the outfan of described comparator, described 11st audion Colelctor electrode be connected with the outfan of described level shifting circuit by described 15th resistance, described 11st audion Grounded emitter.
In some embodiments, described 3rd level voltage generation circuit includes:
Delay circuit, the 21st resistance that described delay circuit includes being sequentially connected in series between described Enable Pin and ground, 23 resistance and the 21st electric capacity;
Comparison circuit, described comparison circuit includes that three end comparable chip, described three end comparable chip include reference edge, positive pole And negative electrode, described Enable Pin is connected with described reference edge by described 21st resistance, described 23rd resistance, institute State plus earth;
Control circuit, described control circuit includes the 22nd resistance and the 21st audion, and described signal output part leads to Crossing described 22nd resistance to be connected with the base stage of described 21st audion, described Enable Pin passes through the described 21st Resistance is connected with the colelctor electrode of described 21st audion, the grounded emitter of described 21st audion;
Output circuit, described output circuit includes the 25th resistance, and the negative electrode of described three end comparable chip is by described the 25 resistance are connected with the outfan of described level shifting circuit.
In some embodiments, described three end comparable chip include comparator, audion and diode, described comparator Normal phase input end be connected with described reference edge, the inverting input of described comparator is connected with reference voltage, described three poles The base stage of pipe is connected with the outfan of comparator, and the colelctor electrode of described audion is connected with described negative electrode, described audion Emitter stage is connected with described anode, and the negative electrode of described diode is connected with the colelctor electrode of described audion, described diode Anode is connected with the emitter stage of described audion.
In some embodiments, drive circuit described in described electromagnetic heater bag
Drive circuit of the present utility model and electromagnetic heater can avoid current rush to produce electromagnetic interference extender Part service life.
Additional aspect of the present utility model and advantage will part be given in the following description, and part will from the following description Become obvious, or recognized by practice of the present utility model.
Accompanying drawing explanation
Above-mentioned and/or additional aspect of the present utility model and advantage can be from combining the accompanying drawings below description to embodiment In will be apparent from easy to understand, wherein:
Fig. 1 is the high-level schematic functional block diagram of the drive circuit of this utility model embodiment.
Fig. 2 is the circuit diagram of the drive circuit of this utility model embodiment.
Fig. 3 is grid voltage and the collection of insulated gate bipolar transistor (Insulated Gate Bipolar Transistor, IGBT) Electrode current performance diagram.
Fig. 4 is the work schedule schematic diagram of the drive circuit of this utility model embodiment.
Fig. 5 is another work schedule schematic diagram of the drive circuit of this utility model embodiment.
Fig. 6 is the circuit diagram of the drive circuit of another embodiment of this utility model.
Fig. 7 is the circuit diagram of the comparator of the drive circuit of another embodiment of this utility model.
Detailed description of the invention
Of the present utility model embodiment is described below in detail, and the example of embodiment is shown in the drawings, wherein, identical Or similar label represents same or similar element from start to finish or has the element of same or like function.
The embodiment described below with reference to accompanying drawing is exemplary, is only used for explaining this utility model, and can not manage Solve as to restriction of the present utility model.
Referring to Fig. 1 and Fig. 2, the drive circuit of this utility model embodiment is for driving the switch of electromagnetic heater Pipe IGBT, drive circuit includes that level shifting circuit and the 3rd level voltage produce circuit 11.
Level shifting circuit is connected with the controller U1 of electromagnetic heater, and controller U1 is used for producing pulsewidth modulation (pulse width modulation, PWM) control signal, pwm control signal includes the first high level, level conversion electricity Road is for being converted to the second high level output by the first high level, and the second high level is used for driving switching tube IGBT to be operated in Saturation conduction state.
3rd level voltage produces the input of circuit 11 and is connected with controller U1, and described 3rd level voltage produces circuit The outfan of 11 is connected with the outfan of level shifting circuit, and controller U1 is for heating in electromagnetic heater low-power Time produce and enable signal, the 3rd level voltage produces circuit 11 for according to enabling signal by pwm control signal Rising and be converted to the 3rd high level along the second corresponding high level, the 3rd high level is used for driving switching tube IGBT to be operated in and puts Big state.
So, even if switching tube IGBT is in hard open state during the heating of electromagnetic heater low-power, but due to switch During pipe IGBT conducting, (rising edge of pwm control signal comes interim) is in magnifying state, produces during switching tube IGBT conducting The size of raw electric current (collector current) depends on the 3rd high level (being i.e. applied to the voltage of the grid of switching tube IGBT) Size, therefore by rationally arranging the 3rd high level, just can control to produce when producing switching tube IGBT conducting rushes Swash the size of electric current, prevent current rush from producing electromagnetic interference and extending the service life of switching tube IGBT.
Electromagnetic heater can be the heater that electromagnetic oven or electric cooker etc. use the heating of LC resonance circuit.
Switching tube IGBT is insulated gate bipolar transistor (Insulated Gate Bipolar Transistor, IGBT), therefore Drive circuit is also referred to as IGBT drive circuit.Second high level puts on the grid of switching tube IGBT, thus controls to open Close the connection between colelctor electrode and the emitter stage of pipe IGBT and disconnection.
Second high level typically at about 15-18V, for example, about 18V.
And the 3rd high level puts on the grid of IGBT, can control to flow through the size of the colelctor electrode of switching tube IGBT. Referring to Fig. 3, when IGBT is operated in magnifying state, the size of current of the colelctor electrode flowing through IGBT depends on IGBT's The size of the voltage of grid, the voltage of the grid of IGBT is the biggest, and the electric current of the colelctor electrode flowing through IGBT is the biggest.Such as, When the voltage of the grid of IGBT is 9V, the electric current of the colelctor electrode flowing through IGBT is 25A to the maximum, in other words, i.e. Make owing to electromagnetic heater low-power causes the voltage of the colelctor electrode of switching tube IGBT to be not zero, but, switching tube Therefore the current rush produced during IGBT conducting is also limited below 25A, thus effectively reduces the amplitude of current rush.
Therefore, the 3rd high level typically at about 6-12V, for example, about 9V.
Controller U1 includes signal output part PPG and Enable Pin EN.Signal output part PPG for according to system and User setup output pwm control signal.It is appreciated that pwm control signal also includes low level.Low level is permissible For about 0V, and the first high level can be about 5V.
Enable Pin EN exports enable signal, such as adding when electromagnetic heater for output according to system and user setup When thermal power is less than 1000W, it is believed that electromagnetic heater low-power heats, it is therefore desirable to output enables signal, Enabling signal can be the first high level, for example, about 5V.
It is appreciated that low level and the first high level are the low level that is capable of identify that of controller U1 and high level.And level Change-over circuit is used for low level and the first high level are converted to low level and the high level that switching tube IGBT can identify, For example, low level and the second high level.Now low level is generally about 0-3V, but usually about 0V.
Level shifting circuit includes that input N11 and outfan N12, input N11 are used for receiving pwm control signal, Level shifting circuit is converted to switching tube IGBT energy for low level and the first high level being capable of identify that by controller U1 Enough low levels identified and the second high level, and the pwm control signal that outfan N12 is after exporting conversion, conversion After pwm control signal include low level and the second high level.
Drive circuit the most also includes push-pull output circuit and gate pole protection circuit.
The input of push-pull output circuit is connected with the outfan of level shifting circuit, for exported by level shifting circuit The low level of high impedance and the second high level are converted to switching tube IGBT low level receivable, low-impedance and the second height Level.
Gate pole protection circuit is connected with the grid of push-pull output circuit and switching tube IGBT, is used for ensureing low level and second High level is in the safe operating voltage of the grid of switching tube IGBT.
At some embodiment, push-pull output circuit includes the second high level power supply.Second high level power supply is for offer the Two high level.
Level shifting circuit includes RC parallel circuit, the first audion being made up of the first resistance R1 and the first electric capacity C1 Q1 and the second audion Q2.First audion Q1 and the second audion Q2 can be NPN type triode.One or three The base stage of pole pipe Q1 is connected with the input N11 of level shifting circuit by RC parallel circuit, the first audion Q1 Colelctor electrode be connected with second electrical level power supply by the second resistance R2, the second resistance R2 is for current limliting, the first audion The grounded emitter of Q1, the base stage of the second audion is connected with the colelctor electrode of the first audion Q1, the second audion Q2 Colelctor electrode be connected with second electrical level power supply by the 3rd resistance R3, the 3rd resistance R3 is current-limiting resistance, the two or three pole The colelctor electrode of pipe Q2 also forms the outfan N12 of level shifting circuit, the grounded emitter of the second audion Q2.
Push-pull output circuit includes that the 3rd audion Q3 and the 4th audion Q4, the 3rd audion Q3 can be NPN Type audion, and the 4th audion can be PNP type triode.The base stage of the 3rd audion Q3 and level shifting circuit Outfan N12 connect, the colelctor electrode of the 3rd audion Q3 by the connection of the 4th resistance R4 and the second high level power supply, 4th resistance R4 is current-limiting resistance,.The base stage of the 4th audion Q4 is connected with the outfan N12 of level shifting circuit, The grounded collector of the 4th audion Q4, and the emitter stage of the emitter stage of the 4th audion Q4 and the 3rd audion Q3 is even Meet and formed the outfan N13 of push-pull output circuit.
Gate pole protection circuit includes the 5th resistance R5 being arranged in series between outfan N13 and the ground of push-pull output circuit 6th resistance R6.Gate pole protection circuit also includes the stabilivolt Z1 being arranged in parallel with the 6th resistance R6.5th resistance R5 One end be connected with the emitter stage of the 3rd audion Q3, one end of the other end and the 6th resistance R6 connects, the 6th resistance The other end ground connection of R6, the outfan N14 of shape drive circuit between the 5th resistance R5 and the 6th resistance R6.
In some embodiments, the 3rd level voltage generation circuit 11 includes delay circuit, comparison circuit, control electricity Road and output circuit.
Delay circuit includes the 11st resistance R11 and the 11st electricity being arranged in series between signal output part PPG and ground Holding C11, wherein, the 11st resistance R11 one end is connected with signal output part PPG, the other end and the 11st electric capacity C11 One end connect, the other end ground connection of the 11st electric capacity C11, the 11st resistance R11 and the 11st electric capacity C11 are constituted Delay circuit, carries out time delay to pwm control signal.Joint is formed between 11st resistance R11 and electric capacity the 11st C11 Point N16.
Comparison circuit includes comparator U11, the 12nd resistance R12, the 13rd resistance R13 and reference voltage source.Reference Voltage source by the 12nd resistance R12 that is connected in series and the 13rd resistance R13 ground connection, the 12nd resistance R12 and the 13 resistance R13 constitute bleeder circuit, and the voltage of the reference voltage source that the 13rd resistance R13 divides is as the reference voltage The normal phase input end of input comparator U11.The inverting input of comparator U11 is connected with node N16.
Reference voltage source provides the voltage of about 5V, and the reference voltage that the 13rd resistance R13 divides is about 2.5V.
Control circuit includes the 14th resistance R14, and Enable Pin EN is by control circuit (i.e. by the 14th resistance R14) It is connected with the outfan of comparator U11.Enable Pin EN forms node N15.
Output circuit includes that the 11st audion Q11 and the 15th resistance R15, the 11st audion Q11 can be NPN Audion, the base stage of the 11st audion Q11 is connected with the outfan of comparator U11, the 11st audion Q11's Colelctor electrode is connected with the outfan N12 of level shifting circuit by the 15th resistance R15, the 11st audion Q11's Grounded emitter.
During work
During high-power heating
Referring to Fig. 4, during the high-power heating of electromagnetic heater, Enable Pin EN output low level, due to comparator U11 Outfan be open-drain output, the base stage of the 11st audion Q11 is pulled to low level, the 11st audion Q11 disconnect, 3rd level voltage produce circuit 11 output unsettled inoperative, the voltage of the outfan N12 of level shifting circuit by The colelctor electrode output of the second audion Q2 determines.
And in each switch periods of pwm control signal:
During the signal output part PPG output low level of controller U1, the first audion Q1 cut-off, the first audion Q1 The voltage of colelctor electrode be driven high, the second audion Q2 conducting, the voltage of the colelctor electrode of the second audion Q2 is pulled to Low level, when the outfan N12 of level shifting circuit is low level, the outfan N13 of push-pull output circuit is low electricity Flat, the outfan N14 of drive circuit is low level, and switching tube IGBT is in cut-off off-state.
When signal output part PPG exports the first high level, the first audion Q1 conducting, the current collection of the first audion Q1 The voltage of pole is pulled to low level, and audion Q2 ends, the voltage of the colelctor electrode of audion Q2 by resistance R3 draw high to Second high level, the outfan N12 of level shifting circuit is the second high level, and the outfan N14 of drive circuit is Two high level, switching tube IGBT is in saturation conduction state;
During heating high-power due to electromagnetic heater, during switching tube IGBT disconnects, LC resonance circuit has enough Energy make the voltage of colelctor electrode of switching tube IGBT be down to zero volt, switching tube IGBT conducting is Sofe Switch state, opens Close pipe IGBT loss little.
During low-power heating
Enable Pin EN exports the first high level, i.e. produces and enables signal, and the base stage of the 11st audion Q11 obtains power supply Power supply, the on off operating mode of the 11st audion Q11 depends on the outfan of comparator U11.
In each switch periods of pwm control signal:
After signal output part PPG output low level, the first audion Q1 cut-off, the colelctor electrode of the first audion Q1 Voltage is driven high, the second audion Q2 conducting, and the voltage of the colelctor electrode of the second audion Q2 is pulled to low level, by Output in the 3rd level voltage generation circuit 11 only drags down the ability of voltage, it is impossible to output high level, so no matter Whether 11st audion Q11 turns on, and the outfan N12 of level shifting circuit is low level, push-pull output circuit Outfan N13 is low level, and the outfan N14 of drive circuit is low level, and switching tube IGBT is in cut-off and disconnects shape State.
When signal output part PPG outfan exports the first high level, on the one hand: the first audion Q1 conducting, the one three The voltage of the colelctor electrode of pole pipe Q1 is pulled to low level, the second audion Q2 cut-off, the colelctor electrode of the second audion Q2 Voltage drawn high to the second high level by resistance R3.On the other hand, owing to signal output part PPG exports the first high level, 11st electric capacity C11 is charged by electric current through the 11st resistance R11, and the voltage of node N16 is gradually risen by 0 volt,
The voltage of node N16 is at time period T2 (the i.e. delay circuit of the voltage of the in-phase input end less than comparator U11 Delay time), the voltage of the in-phase input end of comparator U11 is more than the voltage of inverting input, and comparator U11's is defeated Going out end to disconnect, the voltage of the base stage of the 11st audion Q11 is drawn high by the 14th resistance R14, the 11st audion Q11 Conducting, the colelctor electrode of the 11st audion Q11 is pulled to low level, the voltage of the outfan N12 of level shifting circuit Determined by the 3rd resistance R3 and the 15th resistance R15 dividing potential drop, in some embodiments, the 3rd resistance R3 and the tenth The resistance of five resistance R15 is equal, then the 3rd high level of the outfan N12 output of level shifting circuit is 9V, recommends The voltage of the outfan N13 of output circuit is the 3rd high level, and the voltage of the outfan N14 of level shifting circuit is Three high level, switching tube IGBT is in amplification shape.
The voltage of node N16 is after the voltage higher than comparator U11 in-phase input end, and the homophase of comparator U11 inputs The voltage of end is less than the voltage of inverting input, and comparator U11 is output as low level, the 11st audion Q11's Base stage is pulled low to low level, and the 11st audion Q11 cut-off turns off, the electricity of the outfan N12 of level shifting circuit Pressure is determined by the colelctor electrode of the second audion Q2, and the outfan N12 of level shifting circuit is the second high level, recommends defeated The outfan N13 going out circuit is the second high level, and the outfan N14 of drive circuit is the second high level, switching tube IGBT Enter saturation conduction state.Owing to after elapsed time section T2, the collector voltage of switching tube IGBT is reduced to zero volt, this Time switching tube IGBT enter saturation conduction state will not produce current rush, the electric current of the colelctor electrode of switching tube IGBT by The inductance L of LC resonance circuit determines.
Please join Fig. 5, in some embodiments, when the width T of the first high level of pwm control signal is less than time delay During the delay time T2 of circuit, N14 output low level of the outfan of drive circuit and the 3rd high level, do not export Two high level.In some embodiments, when examining pot or starting heating, the first high level of pwm control signal Width T is less than delay time T2, can effectively reduce the vibration impulse loading pan, thus generation when reducing heating Noise.Such as, the low level width T1 of pwm control signal can be in 1 to 2 microsecond, and delay time T2 exists 3 to 4 microseconds.
Referring to Fig. 6, the drive circuit of this utility model further embodiments is electric with the driving of embodiments discussed above Road is essentially identical, but in the embodiment being discussed below, the 3rd level voltage produces circuit 21 and the 3rd level electricity It is different that pressure produces circuit 11.
3rd level voltage produces circuit 21 and includes delay circuit, comparison circuit, control circuit and output circuit equally.
The 21st resistance R21 that delay circuit includes being sequentially connected in series between Enable Pin EN and ground, the 23rd Resistance R23 and the 21st electric capacity C21.That is, Enable Pin EN passes through the 21st resistance R21, the 23rd resistance R23 and the 21st electric capacity C21 ground connection.
Refer to Fig. 6, comparison circuit include three end comparable chip U21, three end comparable chip U21 include reference edge R, Positive pole A and negative electrode C.Enable Pin EN is by the 21st resistance R21, the 23rd resistance R23 with reference edge R even Connect, positive pole A ground connection.Refering to Fig. 7, three end comparable chip U21 also include comparator U210, audion and diode, The normal phase input end of comparator U210 is connected with reference edge R, the inverting input of comparator U210 and reference voltage (2.5V) Connecting, the base stage of audion is connected with the outfan of comparator, and the colelctor electrode of audion is connected with negative electrode C, audion Emitter stage is connected with anode A, and the negative electrode of diode is connected with the colelctor electrode of audion, the anode of diode and audion Emitter stage connects.
Control circuit includes that the 22nd resistance R22 and the 21st audion Q21, signal output part PPG are by the The base stage of 22 resistance R22 and the 21st audion Q21 connects, and Enable Pin EN passes through the 21st resistance R21 It is connected with the colelctor electrode of the 21st audion Q21, the grounded emitter of the 21st audion Q21.
Output circuit includes that the 25th resistance R25, the negative electrode C of three end comparator U21 are by the 25th resistance R25 It is connected with the colelctor electrode of the second audion Q2.
Drive circuit in the embodiment that the operation principle of the drive circuit in the embodiment that Fig. 6 describes and Fig. 2 describe Operation principle essentially identical, do not repeat them here.
In the description of embodiment of the present utility model, it is to be understood that term " " center ", " longitudinally ", " horizontal stroke To ", " length ", " width ", " thickness ", " on ", D score, "front", "rear", " left ", " right ", " vertically ", " level ", " top ", " end ", " interior ", " outward ", " clockwise ", " inverse Hour hands " etc. instruction orientation or position relationship be based on orientation shown in the drawings or position relationship, be for only for ease of description Embodiment of the present utility model and simplification describe rather than indicate or imply that the device of indication or element must have specific Orientation, with specific azimuth configuration and operation, therefore it is not intended that restriction to embodiment of the present utility model. Additionally, term " first ", " second " are only used for describing purpose, and it is not intended that instruction or hint relative importance Or the implicit quantity indicating indicated technical characteristic.Thus, define " first ", " second " feature permissible Express or implicitly include one or more described features.In the description of embodiment of the present utility model, " many Individual " it is meant that two or more, unless otherwise expressly limited specifically.
In the description of embodiment of the present utility model, it should be noted that unless otherwise clearly defined and limited, Term " is installed ", " being connected ", " connection " should be interpreted broadly, and connects for example, it may be fixing, it is also possible to be Removably connect, or be integrally connected;Can be mechanically connected, it is also possible to be electrical connection or can mutually communication;Permissible It is to be joined directly together, it is also possible to be indirectly connected to by intermediary, can be connecting or two elements of two element internals Interaction relationship.For the ordinary skill in the art, can understand that above-mentioned term is at this as the case may be Concrete meaning in the embodiment of utility model.
In embodiment of the present utility model, unless otherwise clearly defined and limited, fisrt feature second feature it On " " or D score can include that the first and second features directly contact, it is also possible to include that the first and second features are not Directly contact but by the other characterisation contact between them.And, fisrt feature second feature " on ", " top " and " above " includes that fisrt feature directly over second feature and oblique upper, or is merely representative of fisrt feature water Flat height is higher than second feature.Fisrt feature second feature " under ", " lower section " and " below " include that first is special Levy directly over second feature and oblique upper, or be merely representative of fisrt feature level height less than second feature.
Following disclosure provides many different embodiments or example for realizing embodiment of the present utility model Different structure.In order to simplify the disclosure of embodiment of the present utility model, hereinafter to the parts of specific examples and arrange into Line description.Certainly, they are the most merely illustrative, and are not intended to limit this utility model.Additionally, this utility model Embodiment can in different examples repeat reference numerals and/or reference letter, this repetition is to simplify and clear Purpose, itself do not indicate discussed various embodiment and/or arrange between relation.Additionally, it is of the present utility model Various specific technique that embodiment provides and the example of material, but those of ordinary skill in the art it can be appreciated that The application of other techniques and/or the use of other materials.
In the description of this specification, reference term " embodiment ", " some embodiments ", " schematically Embodiment ", " example ", the description of " concrete example " or " some examples " etc. mean to combine described embodiment Or example describe specific features, structure, material or feature be contained at least one embodiment of the present utility model or In example.In this manual, the schematic representation to above-mentioned term is not necessarily referring to identical embodiment or example. And, the specific features of description, structure, material or feature can be in any one or more embodiments or examples In combine in an appropriate manner.
In flow chart or at this, any process described otherwise above or method description are construed as, and represent and include one The module of code, fragment or the portion of the executable instruction of the individual or more step for realizing specific logical function or process Point, and the scope of preferred implementation of the present utility model includes other realization, wherein can not be by shown or beg for The order of opinion, including according to involved function by basic mode simultaneously or in the opposite order, performs function, this Should be understood by embodiment person of ordinary skill in the field of the present utility model.
Represent in flow charts or the logic described otherwise above at this and/or step, for example, it is possible to be considered as Realize the sequencing list of the executable instruction of logic function, may be embodied in any computer-readable medium, for Instruction execution system, device or equipment (system such as computer based system, including processing module or other can be from Instruction execution system, device or equipment instruction fetch also perform the system of instruction) use, or combine these instruction execution systems, Device or equipment and use.For the purpose of this specification, " computer-readable medium " can be any can comprise, store, Communication, propagation or transmission procedure for instruction execution system, device or equipment or combine these instruction execution systems, device Or equipment and the device that uses.The more specifically example (non-exhaustive list) of computer-readable medium includes following: have The electrical connection section (electronic installation) of one or more wirings, portable computer diskette box (magnetic device), random access memory (RAM), read only memory (ROM), erasable read only memory (EPROM or flash memory) of editing, optical fiber fills Put, and portable optic disk read only memory (CDROM).It addition, computer-readable medium can even is that can be thereon Print paper or other suitable media of described program because can such as by paper or other media are carried out optical scanning, Then carry out editing, interpreting or be processed to electronically obtain described program, so with other suitable methods if desired After store it in computer storage.
Should be appreciated that each several part of embodiment of the present utility model can use hardware, software, firmware or combinations thereof Realize.In the above-described embodiment, multiple steps or method in memory and can be held by suitably instruction with storage Software or firmware that row system performs realize.Such as, if realized with hardware, with the most the same, Can realize by any one in following technology well known in the art or their combination: have for data signal is realized The discrete logic of the logic gates of logic function, has the special IC of suitable combination logic gate circuit, Programmable gate array (PGA), field programmable gate array (FPGA) etc..
Those skilled in the art are appreciated that and realize all or part of step that above-described embodiment method is carried The program that can be by completes to instruct relevant hardware, and described program can be stored in a kind of computer-readable storage medium In matter, this program upon execution, including one or a combination set of the step of embodiment of the method.
Additionally, each functional unit in each embodiment of the present utility model can be integrated in a processing module, also Can be that unit is individually physically present, it is also possible to two or more unit are integrated in a module.Above-mentioned collection The module become both can realize to use the form of hardware, it would however also be possible to employ the form of software function module realizes.Described integrated If module realize using the form of software function module and as independent production marketing or when using, it is also possible to be stored in In one computer read/write memory medium.
Storage medium mentioned above can be read only memory, disk or CD etc..
Although above it has been shown and described that embodiment of the present utility model, it is to be understood that above-mentioned embodiment It is exemplary, it is impossible to be interpreted as that those of ordinary skill in the art is of the present utility model to restriction of the present utility model In the range of can implement be changed, revise, replace and modification to above-mentioned enforcement.

Claims (10)

1. a drive circuit, for driving the switching tube of electromagnetic heater, it is characterised in that described drive circuit includes:
Level shifting circuit, described level shifting circuit is connected with the controller of described electromagnetic heater, described controller is used for producing pwm control signal, described pwm control signal includes the first high level, described level shifting circuit is for being converted to the second high level output by described first high level, and described second high level is used for driving described switching tube to be operated in saturation conduction state;And
3rd level voltage produces circuit, the input that described 3rd level voltage produces circuit is connected with described controller, the outfan that described 3rd level voltage produces circuit is connected with the outfan of described level shifting circuit, described controller enables signal for producing when described electromagnetic heater low-power heats, described 3rd level voltage produces circuit and is used for, according to described enable signal, described second high level corresponding for the rising edge of described pwm control signal is converted to the 3rd high level, and described 3rd high level is used for driving described switching tube to be operated in magnifying state.
2. drive circuit as claimed in claim 1, it is characterised in that described pwm control signal includes that low level, described level shifting circuit are used for exporting described low level;
Described drive circuit also includes:
Push-pull output circuit, the input of described push-pull output circuit is connected with the outfan of described level shifting circuit, is converted to Low ESR for described low level and described second high level exported by described level shifting circuit by high impedance.
3. drive circuit as claimed in claim 2, it is characterised in that described controller includes that signal output part and Enable Pin, described signal output part are used for exporting described pwm control signal, and described Enable Pin is used for exporting described enable signal;
Described push-pull output circuit includes that the second high level power supply, described second high level power supply are used for providing described second high level;
Described level shifting circuit includes the RC parallel circuit being made up of the first resistance and the first electric capacity, first audion and the second audion, described first audion and described second audion are NPN type triode, the base stage of described first audion is connected with described signal output part by described RC parallel circuit, the colelctor electrode of described first audion is connected with described second electrical level power supply by the second resistance, the grounded emitter of described first audion, the base stage of described second audion is connected with the colelctor electrode of described first audion, the colelctor electrode of described second audion is connected with described second electrical level power supply by the 3rd resistance, the grounded emitter of described second audion, the outfan of the most described level shifting circuit of current collection of described second audion.
4. drive circuit as claimed in claim 3, it is characterised in that described push-pull output circuit includes the 3rd audion and the 4th audion, and described 3rd audion is NPN type triode, and described 4th audion is PNP type triode;
The base stage of described 3rd audion is connected with the colelctor electrode of described second audion, the colelctor electrode of described 3rd audion is connected with described second high level power supply by the 4th resistance, the base stage of described 4th audion is connected with the colelctor electrode of described second audion, the grounded collector of described 4th audion, and the emitter stage of described 4th audion is connected with the emitter stage of described 3rd audion.
5. drive circuit as claimed in claim 4, it is characterised in that described drive circuit includes:
Gate pole protection circuit, described gate pole protection circuit is connected with the grid of described push-pull output circuit and described switching tube, for ensureing that described low level and described second high level are in the safe operating voltage of the grid of described switching tube.
6. drive circuit as claimed in claim 5; it is characterized in that; described gate pole protection circuit includes the 5th resistance being arranged in series between emitter stage and the ground of described 3rd audion and the 6th resistance and the stabilivolt arranged with described 6th resistor coupled in parallel; wherein; one end of described 5th resistance is connected with the emitter stage of described 3rd audion; the other end is connected with one end of described 6th resistance, the other end ground connection of described 6th resistance.
7. drive circuit as claimed in claim 3, it is characterised in that described 3rd level voltage produces circuit and includes:
Delay circuit, described delay circuit includes the 11st resistance R and the 11st electric capacity being arranged in series between described signal output part and ground, wherein, described 11st resistance one end is connected with described signal output part, the other end is connected with one end of described 11st electric capacity, the other end ground connection of described 11st electric capacity;
Comparison circuit, described comparison circuit includes comparator, the 12nd resistance, the 13rd resistance and reference voltage source, described reference voltage source is connected with the normal phase input end of described comparator by described 12nd resistance, described 13rd resistance 3 is connected between normal phase input end and the ground of described comparator, and described signal output part is connected with the inverting input of described comparator by described 11st resistance;
Control circuit, described control circuit includes the 14th resistance, and described Enable Pin is connected with the outfan of described comparator by described 14th resistance;
Output circuit, described output circuit includes the 11st audion and the 15th resistance, described 11st audion is NPN audion, the described base stage of the 11st audion is connected with the outfan of described comparator, the colelctor electrode of described 11st audion is connected with the outfan of described level shifting circuit by described 15th resistance, the grounded emitter of described 11st audion.
8. drive circuit as claimed in claim 3, it is characterised in that described 3rd level voltage produces circuit and includes:
Delay circuit, described delay circuit includes the 21st resistance, the 23rd resistance and the 21st electric capacity being sequentially connected in series between described Enable Pin and ground;
Comparison circuit, described comparison circuit includes that three end comparable chip, described three end comparable chip include reference edge, positive pole and negative electrode, and described Enable Pin is connected with described reference edge by described 21st resistance, described 23rd resistance, described plus earth;
Control circuit, described control circuit includes the 22nd resistance and the 21st audion, described signal output part is connected with the base stage of described 21st audion by described 22nd resistance, described Enable Pin is connected with the colelctor electrode of described 21st audion by described 21st resistance, the grounded emitter of described 21st audion;
Output circuit, described output circuit includes the 25th resistance, and the negative electrode of described three end comparable chip is connected with the outfan of described level shifting circuit by described 25th resistance.
9. drive circuit as claimed in claim 8, it is characterized in that, described three end comparable chip include comparator, audion and diode, the normal phase input end of described comparator is connected with described reference edge, the inverting input of described comparator is connected with reference voltage, the base stage of described audion is connected with the outfan of comparator, the colelctor electrode of described audion is connected with described negative electrode, the emitter stage of described audion is connected with the anode of described diode, the negative electrode of described diode is connected with the colelctor electrode of described audion, the anode of described diode is connected with the emitter stage of described audion.
10. an electromagnetic heater, it is characterised in that include the drive circuit as described in claim 1-9 any one.
CN201620295051.6U 2016-04-11 2016-04-11 Drive circuit and electromagnetic heating device Active CN205657859U (en)

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Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107318183A (en) * 2017-06-30 2017-11-03 浙江绍兴苏泊尔生活电器有限公司 Electromagnetic oven
CN108024405A (en) * 2016-11-03 2018-05-11 佛山市顺德区美的电热电器制造有限公司 Electromagnetic heating system and its protective device
CN108076546A (en) * 2016-11-15 2018-05-25 佛山市顺德区美的电热电器制造有限公司 Electromagnetic heating system and its protective device and guard method
CN108347237A (en) * 2017-08-28 2018-07-31 九阳股份有限公司 The control method of electromagnetic heater
CN108347238A (en) * 2017-08-28 2018-07-31 九阳股份有限公司 The switch controlled circuit of electromagnetic heater
CN108371471A (en) * 2017-09-15 2018-08-07 九阳股份有限公司 Electromagnetic heating electric rice cooker and its cooking methods
CN108873761A (en) * 2017-05-10 2018-11-23 佛山市顺德区美的电热电器制造有限公司 The method for heating and controlling and device of electromagnetic oven
CN109842308A (en) * 2017-11-29 2019-06-04 佛山市顺德区美的电热电器制造有限公司 The control device and method of electromagnetism cooking pot and its power switch tube
CN110311365A (en) * 2018-03-27 2019-10-08 深圳光峰科技股份有限公司 A kind of slip lid gate control circuit

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108024405A (en) * 2016-11-03 2018-05-11 佛山市顺德区美的电热电器制造有限公司 Electromagnetic heating system and its protective device
CN108076546A (en) * 2016-11-15 2018-05-25 佛山市顺德区美的电热电器制造有限公司 Electromagnetic heating system and its protective device and guard method
CN108873761A (en) * 2017-05-10 2018-11-23 佛山市顺德区美的电热电器制造有限公司 The method for heating and controlling and device of electromagnetic oven
CN108873761B (en) * 2017-05-10 2021-07-27 佛山市顺德区美的电热电器制造有限公司 Heating control method and device of induction cooker
CN107318183B (en) * 2017-06-30 2020-09-08 浙江绍兴苏泊尔生活电器有限公司 Electromagnetic oven
CN107318183A (en) * 2017-06-30 2017-11-03 浙江绍兴苏泊尔生活电器有限公司 Electromagnetic oven
CN108347237A (en) * 2017-08-28 2018-07-31 九阳股份有限公司 The control method of electromagnetic heater
CN108347238A (en) * 2017-08-28 2018-07-31 九阳股份有限公司 The switch controlled circuit of electromagnetic heater
CN108371471A (en) * 2017-09-15 2018-08-07 九阳股份有限公司 Electromagnetic heating electric rice cooker and its cooking methods
CN109842308A (en) * 2017-11-29 2019-06-04 佛山市顺德区美的电热电器制造有限公司 The control device and method of electromagnetism cooking pot and its power switch tube
CN110311365A (en) * 2018-03-27 2019-10-08 深圳光峰科技股份有限公司 A kind of slip lid gate control circuit

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