CN2722554Y - Inductive heating inversion trigger with MAXO30 chip - Google Patents
Inductive heating inversion trigger with MAXO30 chip Download PDFInfo
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- CN2722554Y CN2722554Y CN 200420088810 CN200420088810U CN2722554Y CN 2722554 Y CN2722554 Y CN 2722554Y CN 200420088810 CN200420088810 CN 200420088810 CN 200420088810 U CN200420088810 U CN 200420088810U CN 2722554 Y CN2722554 Y CN 2722554Y
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Abstract
The utility model discloses an inductive heating inversion trigger with an MAX O30 chip, comprising a zero-cross comparator, the MAX038 chip, a low pass filter circuit, a V<FADJ> forming circuit, the reverse circuit of reference voltage, a first-order low pass active filtering and antiphase summing circuit, the operation amplification circuit of inphase and antiphase proportion, two inphase input hysteresis comparators, two reverse circuits, two shaping circuits of level conversion, a pulse inhibited circuit and a startup control circuit. The utility model realizes the tracking function of the locking phase frequency of non phase difference, which creates a pulse duty ratio which does not alter following the changes of working frequency, and the utility model has the advantages of broad applied frequency and capturing range, fast tracking rate, accurate tracking frequency, etc. The inverter adopting the trigger can run on higher frequency, working efficiency no longer drops down following the raising of the working frequency, and the conversion efficiency, the working frequency, the operating stability and the dependability of the inverter are raised. The utility model realizes that one circuit not only can be used for the triggering of a series resonance inverter, but also can be used for the triggering of a parallel resonance inverter; and the inductive heating inversion trigger with the MAX O30 chip makes use of the MAX038 chip to realize the startup control of the separate excitation of the frequency conversion; the inductive heating inversion trigger with the MAX O30 chip has dependable inhibition and protection functions.
Description
One, affiliated technical field
The utility model belongs to a kind of nothing and differs phase-locked high frequency, superaudio induction heating inversion trigger.
Two, background technology
Induction heating is widely used in hot worked occasions such as Metal Melting, diathermanous, heat treatment and welding, has become indispensable hot working means such as metallurgy, national defence, machining, casting, forging and boats and ships, aircraft, auto manufacturing at present.Because large power all-controlled device isolation gate pole transistor IGBT, power field effect transistor MOSFET and static induction transistor SIT adapt to the frequency height, capacity is big, will be widely used in various hot worked occasions by its semiconductor induction heating inverter that constitutes with its superior characteristics.At present, the inverter that is made of full control device has serial-resonant inverter and parallel resonance formula inverter, for the efficient height, the reliability and stability that make serial-resonant inverter and the work of parallel resonance formula inverter are good, the performance of its inversion trigger is extremely important.What the circuits for triggering application of existing serial-resonant inverter was maximum is the CD4046 phase-locked loop chip, utilize it can realize not having the difference frequency tra function well, and the input square wave there is not the duty ratio requirement, its tracking output is that duty ratio is 50% square wave, and can obtaining another road after anti-phase, to differ 180 °, duty ratio be 50% square wave.Because to the duty ratio no requirement (NR) of input square wave, so can be before forming the input square wave, by resonance current i
0(sine wave) realizes the phase compensation function by comparator.But, the change of the input voltage size of inverter during along with Power Regulation, resonance current i
0Amplitude change thereupon, the phase compensation angle is with i
0Amplitude change and change, cause the stability under working conditions of inverter poor thus.The phase-locked output of CD4046 is that duty ratio is 50% square wave, its dead band can only be produced by the method for circuit delay, the dead band time corresponding that is formed by the circuit delay method can not change because of frequency change, it is one " dead time ", like this, after operating frequency raises effective dead band is broadened relatively, the duty ratio of trigger impulse diminishes, the inverter reactive current is increased, and inversion efficiency reduces; Device is operated in the hard switching state, and di/dt and dv/dt value are increased, and makes inverter stability, reliability decrease.Particularly when inverter is operated in the upper frequency situation, more difficult the meeting the demands in dead band that produce of method thus.Parallel resonance formula inverter is because its workload-adaptability is strong, the resonance point impedance is pure resistive and maximum, resonance current i during parallel resonance
0Minimum is unlikely to make the straight-through and good operating stability of inverter bridge, easily protection, so it has good application prospects, but because it starts comparatively difficulty, and the voltage that components and parts bear is higher, so its circuits for triggering are difficult to realize that application is very limited.Because the anti-conveyance capacity of the full control device of inverter is more weak; when because of starting or fault makes inverter failure or when causing electric current excessive because of load is overweight; be easy to cause inverter brachium pontis components from being damaged; therefore want the design safety safeguard measure in the circuit; existing safety precautions is the operating state by the driver module electric circuit inspection device of brachium pontis device; think and block trigger impulse by the driver module circuit when overcurrent occurring, reach the purpose of protection, but it is bigger to quote this kind mode risk.
Three, summary of the invention
The utility model solves the above-mentioned problems in the prior art exactly, and the duty ratio that a kind of trigger impulse is provided does not change the induction heating inversion trigger that is made of the MAX038 chip that changes with operating frequency.
For addressing the above problem, technical solution of the present utility model is: a kind of induction heating inversion trigger that is made of the MAX038 chip, it comprises zero-crossing comparator, MAX038 chip, low-pass filter circuit, V
FADJForm circuit, reference voltage negate circuit, single order low pass active power filtering and anti-phase summing circuit, in-phase proportion operational amplification circuit, anti-phase scale operation amplifying circuit, two homophase input hysteresis loop comparators, two level conversion shaping circuits, pulse blocking circuit and start-up control circuit; Feedback signal is the voltage U at series resonance electric capacity two ends
C, it connects the input of zero-crossing comparator, and the zero-crossing comparator output connects input 13 pin of the inside phase detectors of MAX038 chip, and resistance R 2, capacitor C 4 constitute low-pass filter circuit, and resistance R 3 constitutes V
FADJForm circuit, output 12 pin of the inside phase detectors of MAX038 chip be divided into four the tunnel after frequency control voltage input 8 pin are connected, one the tunnel connects resistance R 2 and capacitor C 4 back ground connection, another road is by resistance R 3 ground connection, Third Road is by input 1 end of voltage follower connection single order low pass active power filtering and anti-phase summing circuit, and the four the tunnel connects the start-up control circuit; 2.5V band gap reference voltage output 1 pin of MAX038 chip connects the input of reference voltage negate circuit, the output of reference voltage negate circuit connects input 2 ends of single order low pass active power filtering and anti-phase summing circuit, and the output of single order low pass active power filtering and anti-phase summing circuit is connected centre frequency Control current input 10 pin of MAX038 chip by resistance or adjustable resistance; Single order low pass active power filtering and anti-phase summing circuit are made up of operational amplifier U2B, resistance R 4, R5, R6, R7 and capacitor C 5, it imports the end that 1 end is a resistance R 4, importing 2 ends is an end of resistance R 6, the other end of resistance R 4, R6 connects the inverting input of U2B, the in-phase input end of U2B is by resistance R 5 ground connection, be connected across between the inverting input and output of U2B after capacitor C 5 and resistance R 7 parallel connections, the U2B output connects 10 pin of MAX038 chip by resistance or adjustable resistance; The MAX038 chip ± input 17 of 5V power supply is connected respectively with 20 pin ± the 5V power supply, address input end 3 pin connection+5V power supplys, 4 pin ground connection are selected in the waveform output of its TLL/CMOS level, 17 pin are connected the back by capacity earth with 3 pin, 20 pin pass through capacity earth; Ground wire 15 pin of ground wire 2 pin of its separation, 6 pin, 9 pin, 11 pin, 18 pin, control circuit of duty ratio input 7 pin and digital circuit are ground connection respectively, and link 5 pin of its outside oscillating capacitance connect capacitor C
1Back ground connection; The sine wave of MAX038 chip, square wave, triangular signal output 19 pin one tunnel connect the input of in-phase proportion operational amplification circuit, one the tunnel connects the input of anti-phase scale operation amplifying circuit, the output of homophase and anti-phase scale operation amplifying circuit is connected the input of homophase input hysteresis loop comparator respectively: an end of resistance R 14 and an end of resistance R 19, the locking pulse guard signal is through the inverting input of pulse lockout circuit concatenation operation amplifier U6A and U6C, the output of homophase input hysteresis loop comparator: the output of U6A and U6C is connected level translation shaping circuit input respectively: an end of resistance R 21 and an end of resistance R 22, homophase input hysteresis loop comparator one of them by operational amplifier U6A, diode D3, D4, adjustable resistance P2, P3, voltage-stabiliser tube Z1, Z2 and resistance R 14, R15 forms, the other end of resistance R 14 connects the in-phase input end of U6A, the in-phase input end of U6A connects the positive pole of diode D3 and the negative pole of diode D4, the positive pole of the negative pole of diode D3 and diode D4 is connected adjustable resistance P2 respectively, the end of P3, adjustable resistance P2, the other end of P3 connects the back and divides two-way: the resistance R 15 of leading up to is connected to the output of U6A, another road connects the positive pole of voltage-stabiliser tube Z2, the negative pole of voltage-stabiliser tube Z2 is connected with the negative pole of voltage-stabiliser tube Z1, the plus earth of voltage-stabiliser tube Z1; Another homophase input hysteresis loop comparator is made up of operational amplifier U6C, diode D5, D6, adjustable resistance P4, P5, voltage-stabiliser tube Z3, Z4 and resistance R 19, R20, and its annexation is the same; The output of level translation shaping circuit: MAX900 voltage comparator U1B is connected the input that inverter is controlled the device drive module entirely respectively with the output of MAX900 voltage comparator U1C, two level translation shaping circuit annexations are identical, one of them is by MAX900 voltage comparator U1B, resistance R 21, diode D7, D8 forms, the other end of resistance R 21 divides the in-phase input end of three tunnel: one tunnel connection U1B, one the tunnel connects the positive pole of diode D8, the minus earth of diode D8, Third Road connects the negative pole of diode D7, the plus earth of diode D7, the U1B reverse inter-input-ing ending grounding; Another level translation shaping circuit is by MAX900 voltage comparator U1C, and resistance R 22, diode D9, D10 form.
Feedback signal described in the utility model is the current i of parallel resonance electric capacity
COutput at described two homophases input hysteresis loop comparator: the output of operational amplifier U6A and U6C and two level translation shaping circuit inputs: be connected a negate circuit between the end of resistance R 21 and resistance R 22 respectively, one of them negate circuit is made of operational amplifier U6B, resistance R 23, R24, R25, and another negate circuit is made of operational amplifier U6D, resistance R 27, R28, R26.
The utility model also can be connected a level adjustment circuit that is made of potentiometer and voltage follower respectively at the inverting input of in-phase proportion operational amplification circuit and the in-phase input end of anti-phase scale operation amplifying circuit.
Voltage follower, potentiometer P6 and switch S 1 that start-up control circuit of the present utility model constitutes by adjustable resistance P9, electrochemical capacitor C6, by operational amplifier U5B are formed, the end of potentiometer P6 is by switch S 1 connection-5V power supply, its other end ground connection, its sliding point connects the input of voltage follower, the output of voltage follower connects the negative pole of electrochemical capacitor C6, the positive pole of electrochemical capacitor C6 connects the end of adjustable resistance R9, tell after the other end of adjustable resistance R9 is connected 12 pin and 8 pin are connected the four the tunnel on.
Because the utility model has adopted such scheme, when it is applied in series resonant inverter, resonance current i
0Be sine wave, with the voltage U at resonant capacitance two ends
CAs feedback signal, U
CBe similarly sine wave and hysteresis i
090 °; U
CThrough after the zero balancing, become duty ratio and be 50% square wave, insert the input 13 pin PDI end of the inside phase detectors of MAX038 chip.The output 12 pin PDO of the inside phase detectors of MAX038 chip end is connected with frequency control voltage input 8 pin FADJ end, and and ground between the low-pass filter circuit that constitutes by resistance R 2, capacitor C 4 of access and the V that constitutes by resistance R 3
FADJForm circuit, make the average current of the output 12 pin output of inner phase detectors on resistance R 3, form V
FADJVoltage, V
FADJVoltage import 8 pin to the operating frequency of oscillator regulate control, realize phase-locked.Operational amplifier U2B and resistance R 4, R5, R6, R7 constitute anti-phase summing circuit, because the access of capacitor C 5 makes this circuit become the single order low pass active filter circuit of anti-phase input again, this circuit is on the one hand to V
FADJVoltage carry out filtering, main be to V
FADJV with the output of 1 pin of MAX038 chip
REFAfter process reference voltage negate circuit is anti-phase-V
REFCarry out anti-phase summation operation, its operation result is used to regulate I through 10 pin of resistance or adjustable resistance input MAX038 chip
INThe size of electric current, reach the purpose that centre frequency is followed the tracks of PDI input square wave frequency.3 pin of MAX038 chip connect high level, and 4 pin ground connection make its 19 pin U
OUTBe output as triangular wave.Triangular wave and U
CKeep with frequently and be anti-phase locking relation.The triangular wave of MAX038 chip output through the in-phase proportion operational amplification circuit amplify and anti-phase scale operation amplifying circuit negate amplify after the formation two-way triangular wave of 180 ° of phasic differences mutually, form the two-way pulse with phase compensation time and dead band through homophase input hysteresis loop comparator respectively again, this two-way pulse generates the trigger impulse U that two-way differs 180 ° more respectively behind the level translation shaping circuit
01, U
02, the resistance of regulating adjustable resistance P2, P4 with regard to the scalable phase compensation time, to satisfy the requirement of phase compensation, is regulated the resistance of adjustable resistance P3, P5, just can change the width in dead band.Two-way pulse U
01, U
02Strictness and i
0Synchronously, and the two duty ratio do not change and change pulse U with operating frequency
01Corresponding i
0Positive half cycle, U
02Corresponding i
0Negative half period.To through the two-way pulse that forms behind the homophase input hysteresis loop comparator after the negate of negate circuit, behind the level translation shaping circuit, form the pulse U that two-way differs 180 ° more respectively with overlay region
01, U
02, the two duty ratio does not change with operating frequency and changes, and is used for the triggering of parallel resonance device, parallel resonance device output voltage U
0Be sine wave, at this moment the current i of resonant capacitance
cAs feedback signal, pulse U
01Corresponding U
0Positive half cycle, U
02Corresponding U
0Negative half period.In a word, the utility model utilizes high frequency, the superaudio inversion trigger of MAX038 chip design, has realized not having differing the frequency of phase locking following function, has advantages such as suitable frequency is wide, capture range is wide, and tracking velocity is fast, tracking frequency is accurate; For make inverter always work in power factor near or equal 1 quasi-resonance or resonance condition, created condition to realize inversion device Zero Current Switch (ZCS) or zero voltage switch (ZVS), make inverter can run on higher frequency.Because the pulse duty factor that trigger produces does not change with operating frequency and changes, descend so the inverter operating efficiency no longer raises with operating frequency, and improved the stability and the reliability of inverter work.Because the utility model has been introduced the MAX900 voltage comparator, its trigger impulse rises, and time-delay is lower than 80ns, the time-delay that descends is lower than 50ns, more helps reducing the devices switch loss, improves inverter conversion efficiency and operating frequency.The utility model has realized that a circuit both can be used for the triggering of series resonant inverter, can be used for the triggering two purposes of parallel resonance device again; And it swashs start-up control to utilize the characteristics of MAX038 chip own to realize frequency conversion; Also has reliable blockade defencive function.
Four, description of drawings
Below in conjunction with accompanying drawing the utility model is described further:
Fig. 1 is circuit theory diagrams of the present utility model.
Five, embodiment
Embodiment as shown in Figure 1, a kind of induction heating inversion trigger that constitutes by the MAX038 chip, zero-crossing comparator is made up of operational amplifier U2D, resistance R 1, diode D1, D2, receive the in-phase input end of U2D behind feedback signal process resistance R 1 current limliting and diode D1, the D2 amplitude limit, the reverse inter-input-ing ending grounding of U2D, output connects 13 pin of MAX038 chip.Low-pass filter circuit constitutes V by resistance R 2, capacitor C 4
FADJForming circuit is made of resistance R 3,12 pin of MAX038 chip be divided into four the tunnel after 8 pin are connected, one the tunnel connects resistance R 2 and capacitor C 4 back ground connection, another road is by resistance R 3 ground connection, and Third Road connects input 1 end of single order low pass active power filtering and anti-phase summing circuit by the voltage follower that is made of operational amplifier U2A: an end of resistance R 4; The four the tunnel connects the start-up control circuit that the voltage follower, potentiometer P6 and the switch S 1 that constitute by adjustable resistance P9, electrochemical capacitor C6, by operational amplifier U5B are formed, the end of potentiometer P6 is by switch S 1 connection-5V power supply, other end ground connection, sliding point connects the input of voltage follower, the output of voltage follower connects the negative pole of electrochemical capacitor C6, the positive pole of electrochemical capacitor C6 connects the end of adjustable resistance R9, tell after the other end of adjustable resistance R9 is connected 12 pin and 8 pin are connected the four the tunnel on.Reference voltage negate circuit is made up of operational amplifier U2C, resistance R 8, R9 and R10, the U2C in-phase input end is by resistance R 10 ground connection, output connects input 2 ends of single order low pass active power filtering and anti-phase summing circuit: an end of resistance R 6, the other end of resistance R 8 connects 1 pin of MAX038 chip.Single order low pass active power filtering and anti-phase summing circuit are made up of operational amplifier U2B, resistance R 4, R5, R6, R7 and capacitor C 5, the other end of resistance R 4, R6 connects the inverting input of U2B, the in-phase input end of U2B is by resistance R 5 ground connection, be connected across between the inverting input and output of U2B after capacitor C 5 and resistance R 7 parallel connections, the U2B output connects 10 pin of MAX038 chip by adjustable resistance P1.The in-phase proportion operational amplification circuit is made up of operational amplifier U4A, resistance R 11, R13 and R12; Anti-phase scale operation amplifying circuit is made up of operational amplifier U4C, resistance R 16, R17 and R18; 19 pin of MAX038 chip are divided into two-way, and the resistance R 11 of leading up to connects the in-phase input end of U4A, and another road connects the inverting input of U4C by resistance R 16.Level adjustment circuit one of them by potentiometer P7, capacitor C 7 with form by the voltage follower that operational amplifier U4B constitutes, after capacitor C 7 and potentiometer P7 are in parallel, the one end connects 1 pin of MAX038 chip, other end ground connection, the sliding point of potentiometer P7 connects the input of voltage follower, and the output of voltage follower connects the inverting input of U4A by resistance R 12; Another level adjustment circuit is by capacitor C 8, potentiometer P8 and be made up of the voltage follower that operational amplifier U4D constitutes, after capacitor C 8 and potentiometer P8 are in parallel, the one end connects the output of U2C, other end ground connection, the sliding point of potentiometer P8 connects the input of voltage follower, and the output of voltage follower connects the in-phase input end of U4C by resistance R 18.Homophase input hysteresis loop comparator one of them by operational amplifier U6A, diode D3, D4, adjustable resistance P2, P3, voltage-stabiliser tube Z1, Z2 and resistance R 14, R15 forms, the U6A inverting input connects the A3 point, the in-phase input end of U6A connects the positive pole of diode D3 and the negative pole of diode D4, the positive pole of the negative pole of diode D3 and diode D4 is connected adjustable resistance P2 respectively, the end of P3, adjustable resistance P2, the other end of P3 connects the back and divides two-way: the resistance R 15 of leading up to is connected to the output of U6A, another road connects the positive pole of voltage-stabiliser tube Z2, the negative pole of voltage-stabiliser tube Z2 is connected with the negative pole of voltage-stabiliser tube Z1, the plus earth of voltage-stabiliser tube Z1, the output of U6A directly connects the C1 point, also can connect the B1 point by the negate circuit, the negate circuit is by operational amplifier U6B, resistance R 23, R24, R25 forms, the output of U6A is by the inverting input of resistance R 23 connection U6B, and the output of U6B connects B1; Another homophase input hysteresis loop comparator is made up of operational amplifier U6C, diode D5, D6, adjustable resistance P4, P5, voltage-stabiliser tube Z3, Z4 and resistance R 19, R20, its annexation is the same, the inverting input of U6C connects the A3 point, output directly connects the C2 point, also can connect the B2 point by the negate circuit; The negate circuit is made up of operational amplifier U6D, resistance R 27, R28, R26, and the output of U6C is by the inverting input of resistance R 27 connection U6D, and the output of U6D connects B2; Two level translation shaping circuit annexations are identical, one of them is by MAX900 voltage comparator U1B, resistance R 21, diode D7, D8 form, the A1 point is received the in-phase input end of U1B after by resistance R 21 current limlitings and diode D7, D8 amplitude limit, the U1B reverse inter-input-ing ending grounding, output connects the input that inverter is controlled the device drive module entirely; Another is made up of MAX900 voltage comparator U1C, resistance R 22, diode D9, D10, the A2 point is received the in-phase input end of U1C after by resistance R 22 current limlitings and diode D9, D10 amplitude limit, the U1C reverse inter-input-ing ending grounding, output connects the input that inverter is controlled the device drive module entirely.The pulse blocking circuit is made of not gate U7D, the negate circuit that is made of operational amplifier U8B, resistance R 29, R30, R31, the pulse blocking signal connects the input of not gate U7D, the output one tunnel of U7D connects the C3 point, another road connects the input of negate circuit: an end of resistance R 29, the output of negate circuit connects the B3 point.Connect B2, A3 connection B3 when A1 connects B1, A2, feedback signal is the current i of parallel resonance electric capacity
CThe time, it is used for the triggering to the parallel resonance device; When A1 connected C1, A2 connection C2, A3 connection C3, feedback signal was the voltage U at series resonance electric capacity two ends
CThe time, it is used for the triggering to series resonant inverter.
Claims (6)
1, a kind of induction heating inversion trigger that is made of the MAX038 chip, it is characterized in that: it comprises zero-crossing comparator, MAX038 chip, low-pass filter circuit, V
FADJForm circuit, reference voltage negate circuit, single order low pass active power filtering and anti-phase summing circuit, in-phase proportion operational amplification circuit, anti-phase scale operation amplifying circuit, two homophase input hysteresis loop comparators, two level conversion shaping circuits, pulse blocking circuit and start-up control circuit; Feedback signal is the voltage U at series resonance electric capacity two ends
C, it connects the input of zero-crossing comparator, and the zero-crossing comparator output connects input 13 pin of the inside phase detectors of MAX038 chip, and resistance R 2, capacitor C 4 constitute low-pass filter circuit, and resistance R 3 constitutes V
FADJForm circuit, output 12 pin of the inside phase detectors of MAX038 chip be divided into four the tunnel after frequency control voltage input 8 pin are connected, one the tunnel connects resistance R 2 and capacitor C 4 back ground connection, another road is by resistance R 3 ground connection, Third Road is by input 1 end of voltage follower connection single order low pass active power filtering and anti-phase summing circuit, and the four the tunnel connects the start-up control circuit; 2.5V band gap reference voltage output 1 pin of MAX038 chip connects the input of reference voltage negate circuit, the output of reference voltage negate circuit connects input 2 ends of single order low pass active power filtering and anti-phase summing circuit, and the output of single order low pass active power filtering and anti-phase summing circuit is connected centre frequency Control current input 10 pin of MAX038 chip by resistance or adjustable resistance; Single order low pass active power filtering and anti-phase summing circuit are made up of operational amplifier U2B, resistance R 4, R5, R6, R7 and capacitor C 5, it imports the end that 1 end is a resistance R 4, importing 2 ends is an end of resistance R 6, the other end of resistance R 4, R6 connects the inverting input of U2B, the in-phase input end of U2B is by resistance R 5 ground connection, be connected across between the inverting input and output of U2B after capacitor C 5 and resistance R 7 parallel connections, the U2B output connects 10 pin of MAX038 chip by resistance or adjustable resistance; The MAX038 chip ± input 17 of 5V power supply is connected respectively with 20 pin ± the 5V power supply, address input end 3 pin connection+5V power supplys, 4 pin ground connection are selected in the waveform output of its TLL/CMOS level, 17 pin are connected the back by capacity earth with 3 pin, 20 pin pass through capacity earth; Ground wire 15 pin of ground wire 2 pin of its separation, 6 pin, 9 pin, 11 pin, 18 pin, control circuit of duty ratio input 7 pin and digital circuit are ground connection respectively, and link 5 pin of its outside oscillating capacitance connect capacitor C 1 back ground connection; The sine wave of MAX038 chip, square wave, triangular signal output 19 pin one tunnel connect the input of in-phase proportion operational amplification circuit, one the tunnel connects the input of anti-phase scale operation amplifying circuit, the output of homophase and anti-phase scale operation amplifying circuit is connected the input of homophase input hysteresis loop comparator respectively: an end of resistance R 14 and an end of resistance R 19, the locking pulse guard signal is through the inverting input of pulse lockout circuit concatenation operation amplifier U6A and U6C, the output of homophase input hysteresis loop comparator: the output of U6A and U6C is connected level translation shaping circuit input respectively: an end of resistance R 21 and an end of resistance R 22, homophase input hysteresis loop comparator one of them by operational amplifier U6A, diode D3, D4, adjustable resistance P2, P3, voltage-stabiliser tube Z1, Z2 and resistance R 14, R15 forms, the other end of resistance R 14 connects the in-phase input end of U6A, the in-phase input end of U6A connects the positive pole of diode D3 and the negative pole of diode D4, the positive pole of the negative pole of diode D3 and diode D4 is connected adjustable resistance P2 respectively, the end of P3, adjustable resistance P2, the other end of P3 connects the back and divides two-way: the resistance R 15 of leading up to is connected to the output of U6A, another road connects the positive pole of voltage-stabiliser tube Z2, the negative pole of voltage-stabiliser tube Z2 is connected with the negative pole of voltage-stabiliser tube Z1, the plus earth of voltage-stabiliser tube Z1; Another homophase input hysteresis loop comparator is made up of operational amplifier U6C, diode D5, D6, adjustable resistance P4, P5, voltage-stabiliser tube Z3, Z4 and resistance R 19, R20, and its annexation is the same; The output of level translation shaping circuit: MAX900 voltage comparator U1B is connected the input that inverter is controlled the device drive module entirely respectively with the output of MAX900 voltage comparator U1C, two level translation shaping circuit annexations are identical, one of them is by MAX900 voltage comparator U1B, resistance R 21, diode D7, D8 forms, the other end of resistance R 21 divides the in-phase input end of three tunnel: one tunnel connection U1B, one the tunnel connects the positive pole of diode D8, the minus earth of diode D8, Third Road connects the negative pole of diode D7, the plus earth of diode D7, the U1B reverse inter-input-ing ending grounding; Another level translation shaping circuit is by MAX900 voltage comparator U1C, and resistance R 22, diode D9, D10 form.
2, the induction heating inversion trigger that is made of the MAX038 chip according to claim 1 is characterized in that described feedback signal is the current i of parallel resonance electric capacity
COutput at described two homophases input hysteresis loop comparator: the output of operational amplifier U6A and U6C and two level translation shaping circuit inputs: be connected a negate circuit between the end of resistance R 21 and resistance R 22 respectively, one of them negate circuit is made of operational amplifier U6B, resistance R 23, R24, R25, and another negate circuit is made of operational amplifier U6D, resistance R 27, R28, R26.
3, the induction heating inversion trigger that is made of the MAX038 chip according to claim 1 and 2 is characterized in that being connected a level adjustment circuit that is made of potentiometer and voltage follower respectively at the inverting input of described in-phase proportion operational amplification circuit and the in-phase input end of anti-phase scale operation amplifying circuit.
4, the induction heating inversion trigger that constitutes by the MAX038 chip according to claim 3, one of them is formed by potentiometer P7, capacitor C 7 with by the voltage follower that operational amplifier U4B constitutes to it is characterized in that described level adjustment circuit, after capacitor C 7 and potentiometer P7 are in parallel, one end connects 1 pin of MAX038 chip, other end ground connection, the sliding point of potentiometer P7 connects the input of voltage follower, and the output of voltage follower connects the inverting input of in-phase proportion operational amplification circuit; Another level adjustment circuit is by capacitor C 8, potentiometer P8 and be made up of the voltage follower that operational amplifier U4D constitutes, after capacitor C 8 and potentiometer P8 are in parallel, the one end connects the output of reference voltage negate circuit, other end ground connection, the sliding point of potentiometer P8 connects the input of voltage follower, and the output of voltage follower connects the in-phase input end of anti-phase scale operation amplifying circuit.
5, the induction heating inversion trigger that constitutes by the MAX038 chip according to claim 1 and 2, it is characterized in that described start-up control circuit is by adjustable resistance P9, electrochemical capacitor C6, the voltage follower that constitutes by operational amplifier U5B, potentiometer P6 and switch S 1 are formed, the end of potentiometer P6 is by switch S 1 connection-5V power supply, its other end ground connection, its sliding point connects the input of voltage follower, the output of voltage follower connects the negative pole of electrochemical capacitor C6, the positive pole of electrochemical capacitor C6 connects the end of adjustable resistance R9, tell after the other end of adjustable resistance R9 is connected 12 pin and 8 pin are connected the four the tunnel on.
6, the induction heating inversion trigger that constitutes by the MAX038 chip according to claim 1 and 2, it is characterized in that the negate circuit that described pulse blocking circuit constitutes by not gate U7D, by operational amplifier U8B, resistance R 29, R30, R31 forms, the pulse blocking signal connects the input of not gate U7D, the output one tunnel of U7D connects the C3 point, another road is by the input of resistance R 29 connection negate circuit, and the output of negate circuit connects the B3 point.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200420088810 CN2722554Y (en) | 2004-08-23 | 2004-08-23 | Inductive heating inversion trigger with MAXO30 chip |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200420088810 CN2722554Y (en) | 2004-08-23 | 2004-08-23 | Inductive heating inversion trigger with MAXO30 chip |
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| CN2722554Y true CN2722554Y (en) | 2005-08-31 |
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| CN (1) | CN2722554Y (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102200549A (en) * | 2011-04-11 | 2011-09-28 | 深圳和而泰智能控制股份有限公司 | Phase detection device and method |
| CN108957309A (en) * | 2018-08-27 | 2018-12-07 | 深圳众城卓越科技有限公司 | The circuit and method for being attracted situation for detecting contactor |
| CN109041311A (en) * | 2018-08-13 | 2018-12-18 | 中国科学院长春光学精密机械与物理研究所 | A kind of adaptive digital locking phase controller |
| CN115326921A (en) * | 2022-10-14 | 2022-11-11 | 中国石油大学(华东) | Double-frequency single-phase-locking double-mode detection device and detection method based on double-layer coil |
-
2004
- 2004-08-23 CN CN 200420088810 patent/CN2722554Y/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102200549A (en) * | 2011-04-11 | 2011-09-28 | 深圳和而泰智能控制股份有限公司 | Phase detection device and method |
| CN109041311A (en) * | 2018-08-13 | 2018-12-18 | 中国科学院长春光学精密机械与物理研究所 | A kind of adaptive digital locking phase controller |
| CN109041311B (en) * | 2018-08-13 | 2021-04-06 | 中国科学院长春光学精密机械与物理研究所 | Self-adaptive digital phase-locked controller |
| CN108957309A (en) * | 2018-08-27 | 2018-12-07 | 深圳众城卓越科技有限公司 | The circuit and method for being attracted situation for detecting contactor |
| CN108957309B (en) * | 2018-08-27 | 2023-12-29 | 深圳众城卓越科技有限公司 | Circuit and method for detecting contactor suction condition |
| CN115326921A (en) * | 2022-10-14 | 2022-11-11 | 中国石油大学(华东) | Double-frequency single-phase-locking double-mode detection device and detection method based on double-layer coil |
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