CN103208938A - Feedback direction self-adapting circuit of induction heating power supply inverter and method - Google Patents
Feedback direction self-adapting circuit of induction heating power supply inverter and method Download PDFInfo
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Abstract
The invention belongs to the technical field of induction heating power supply inverters and discloses a feedback direction self-adapting circuit of an induction heating power supply inverter and a method. The circuit adopted by the method comprises a sampling isolation processing circuit and a signal judgment automatic switching circuit. The sampling isolation processing circuit is composed of a voltage sampling isolation processing circuit and a current sampling isolation processing circuit. The current sampling isolation processing circuit and the voltage sampling isolation processing circuit are connected with the input end of the signal judgment automatic switching circuit, and the output end of the signal judgment automatic switching circuit is connected with the pulse-width modulation (PWM) end of the inverter. The circuit can judge the phase relation between Ip and Up, outputs the phase shafting angle of PWM inversion driving pulse to enable a load output wire and a feedback wire of the induction heating power supply inverter to be connected randomly, avoids power supply shutdown even device damage caused by inverted connection of the feedback wire, can automatically switch the output direction of the inverter, and finally achieves the aim of self adapting of the feedback wire direction of the inverter.
Description
Technical field
The invention belongs to electric induction heating power inverter technology field, be specifically related to a kind of induction heating power inverter fed direction-adaptive circuit and method.
Background technology
At present, induction heating power utilizes electromagnetic inductive heating principle to have efficiency of heating surface height, speed is fast, controllability is good and be easy to realize advantages such as mechanization, automation, and as new and high technology and basic technology that metal industry heats, be widely used in industries such as melting, casting, bend pipe, forge hot, welding and surface heat processing.Yet in process of production because processing parts is of a great variety; part dimension has nothing in common with each other; the frequency range that needs alters a great deal; need change load frequently; in the process of changing load, need to adjust the load output line of induction heating power inverter and the position of feedback line; because feedback line is to separate wiring and the direction requirement is arranged with the load output line, if connecing, the feedback line direction instead can cause power supply to be shut down even device failure.If measure the wiring direction, must detect and manually adjust by professional tools such as oscilloscopes.
Summary of the invention
The present invention is for solving the problem that above-mentioned traditional induction heating power inverter load output line and feedback line direction can not connect arbitrarily, propose a kind of induction heating power inverter fed direction-adaptive circuit and method, induction heating power inverter load output line and feedback line can be connected arbitrarily.
The present invention is as follows for finishing foregoing invention purpose solution:
A kind of induction heating power inverter fed direction-adaptive circuit, comprise: sampling isolation processing circuit and signal are judged automatic switch-over circuit, described sampling isolation processing circuit is made up of voltage sample isolation processing circuit and current sample isolation processing circuit, the input of described current sample isolation processing circuit be connected in and inverter output end and load input terminal between cable on, the output of current sample isolation processing circuit and signal judge that the current input terminal of automatic switch-over circuit links to each other; The input of voltage sample isolation processing circuit be connected in and inverter output end and load input terminal between cable A, the B two ends of voltage, the output of voltage sample isolation processing circuit judges that with signal the voltage input end of automatic switch-over circuit links to each other; Described signal judges that the output of automatic switch-over circuit links to each other with the PWM end of inverter.
A kind of induction heating power inverter fed direction-adaptive circuit, described current sample isolation processing circuit is made up of current sensor T, integrated circuit U2A, U3 A and optocoupler U4, wherein integrated circuit U2A is operational amplifier, resistance R 7 is the proportion resistor of operational amplifier multiplication factor with R9, R8 is balance resistance, and capacitor C 3, C4 are filter capacitor; Described integrated circuit U3 A is zero-crossing comparator.
A kind of induction heating power inverter fed direction-adaptive circuit, described voltage sample isolation processing circuit is connected to form by integrated circuit U3 B and mistake zero balancing bleeder circuit, optocoupler U5 by the sampling bleeder circuit, described sampling bleeder circuit is made of resistance R 2 and R5, and described integrated circuit U3 B is comparator.
A kind of induction heating power inverter fed direction-adaptive circuit, described signal judges that automatic switch-over circuit is linked to each other with the P1 end with the P0 end of integrated circuit U1 respectively by the output of integrated circuit U6A, U6B, the input of integrated circuit U6A links to each other with electric current isolation processing circuit, and the input of integrated circuit U6B links to each other with voltage isolation processing circuit; The P10 end of described integrated circuit U1 links to each other with the input of integrated circuit U7A, U7B respectively with the P11 end, and the output of integrated circuit U7A, U7B links to each other with the PWM end of inverter respectively.
A kind of method of induction heating power inverter fed direction-adaptive, its step is as follows:
1), holds the voltage of Direct Sampling, output voltage signal Up after voltage sample isolation processing processing of circuit by A, B between inverter output end and load input terminal; The electric current of while current sensor T from sampling between inverter output end and load input terminal, output current signal Ip after the current sample processing circuit processes;
2), current signal Ip and voltage signal Up be input to signal and judge automatic switch-over circuit, signal judges that automatic switch-over circuit is by judging the phase relation of Ip and Up;
3) determine the phase shift angle to output PWM inversion driving pulse, then, behind PWM1 and PWM2 difference phase shift 180 degree, PWM1 and PWM2 driving pulse exchange;
4) if driving pulse exchanges, the inverter outbound course will be reverse, and the feedback direction also can be reverse, thus automatic switchover inverter outbound course, thus reach the purpose that the inverter fed direction automaticallyes switch.
A kind of method of induction heating power inverter fed direction-adaptive, output current signal Ip after the described current sample processing circuit processes, current signal by the sampling of the current sensor T between inverter output end and load input terminal input I1, I2, be converted to voltage signal through resistance R 1, after resistance R 7, input to the negative input of operational amplifier U2A again, affiliated sample rate current signal inputs to the negative input of comparator U3A through current-limiting resistance R11 after operational amplifier U2A is amplified to suitable ratio; Described voltage signal inputs to the end of current-limiting resistance R16 after U3A crosses zero balancing; The other end of current-limiting resistance R16 inputs to the input of isolating optocoupler U4, and current signal Ip is isolated in output after isolating optocoupler U4.
A kind of method of induction heating power inverter fed direction-adaptive, output voltage signal Up after the described voltage sample isolation processing processing of circuit, by the sampled voltage A between inverter output end and load input terminal, B is after R2 and R5 bleeder circuit dividing potential drop, seal in the negative phase end of comparator U3B by current-limiting resistance R12, produce a comparative voltage through bleeder circuit, input to the forward end of comparator as the threshold voltage of zero-crossing comparator, this voltage signal is after U3B crosses zero balancing, by the input that optocoupler U5 is isolated in current-limiting resistance R17 input, output isolation voltage signal Up after isolating optocoupler U5.
A kind of method of induction heating power inverter fed direction-adaptive, the judgement of described phase relation to Ip and Up, if the phase place of Up and Ip is leading or the hysteresis angle is spent less than 90, then feed back in the right direction, this moment, the PWM driving pulse phase shift through P10 and P11 output was 0 degree, and the phase shift of the driving pulse PWM1 that exports behind process driver U7A and the U7B and PWM2 is 0 degree; If the phase place of Up and Ip is leading or the hysteresis angle greater than in 90 degree, then feeding back direction connects instead, this moment, the PWM driving pulse phase shift through P10 and P11 output was 180 degree, and the phase shift of the driving pulse PWM1 that exports behind process driver U7A and the U7B and PWM2 is 180 degree.
Because adopt aforesaid technical scheme, the present invention has following superiority:
A kind of induction heating power inverter fed direction-adaptive circuit and method, judge automatic switch-over circuit by signal, phase relation to Ip and Up is judged, determine the phase shift angle to output PWM inversion driving pulse then, thereby automatic switchover inverter outbound course finally reaches the purpose of inverter fed line direction-adaptive.Induction heating power inverter load output line and feedback line can be connected arbitrarily.Solved the problem that above-mentioned traditional induction heating power inverter load output line and feedback line direction can not connect arbitrarily.Avoid the feedback line direction to connect instead can causing power supply to shut down even the generation of device failure, have detect easy to adjust.
Description of drawings
Fig. 1 is induction heating power inverter fed direction-adaptive circuit block diagram;
Fig. 2 is the present invention's isolation processing circuit diagram of sampling;
Fig. 3 is that signal of the present invention is judged automatic switch-over circuit figure;
Fig. 4 is that signal of the present invention is handled the back oscillogram;
Fig. 5 is comparison diagram before and after the PWM driving pulse phase shift of the present invention.
Embodiment
Implement in order to be illustrated more clearly in purpose of the present invention and technical scheme, be illustrated below in conjunction with accompanying drawing.
Shown in Fig. 1,2,3,4,5, a kind of induction heating power inverter fed direction-adaptive circuit, comprise: sampling isolation processing circuit and signal are judged automatic switch-over circuit, described sampling isolation processing circuit is made up of voltage sample isolation processing circuit and current sample isolation processing circuit, the input of described current sample isolation processing circuit be connected in and inverter output end and load input terminal between cable on, the output of current sample isolation processing circuit and signal judge that the current input terminal of automatic switch-over circuit links to each other; The input of voltage sample isolation processing circuit be connected in and inverter output end and load input terminal between cable A, the B two ends of voltage, the output of voltage sample isolation processing circuit judges that with signal the voltage input end of automatic switch-over circuit links to each other; Described signal judges that the output of automatic switch-over circuit links to each other with the PWM end of inverter.
Described current sample isolation processing circuit is made up of current sensor T, integrated circuit U2A, U3 A and optocoupler U4, wherein integrated circuit U2A is operational amplifier, resistance R 7 is the proportion resistor of operational amplifier multiplication factor with R9, and R8 is balance resistance, and capacitor C 3, C4 are filter capacitor; Described integrated circuit U3 A is zero-crossing comparator.
Described voltage sample isolation processing circuit is connected to form by integrated circuit U3 B and mistake zero balancing bleeder circuit, optocoupler U5 by the sampling bleeder circuit, and described sampling bleeder circuit is made of resistance R 2 and R5, and described integrated circuit U3 B is comparator.
Described signal judges that automatic switch-over circuit is linked to each other with the P1 end with the P0 end of integrated circuit U1 respectively by the output of integrated circuit U6A, U6B, the input of integrated circuit U6A links to each other with electric current isolation processing circuit, and the input of integrated circuit U6B links to each other with voltage isolation processing circuit; The P10 end of described integrated circuit U1 links to each other with the input of integrated circuit U7A, U7B respectively with the P11 end, and the output of integrated circuit U7A, U7B links to each other with the PWM end of inverter respectively.
A kind of method of induction heating power inverter fed direction-adaptive, its step is as follows:
1), holds the voltage of Direct Sampling, output voltage signal Up after voltage sample isolation processing processing of circuit by A, B between inverter output end and load input terminal; The electric current of while current sensor T from sampling between inverter output end and load input terminal, output current signal Ip after the current sample processing circuit processes;
2), current signal Ip and voltage signal Up be input to signal and judge automatic switch-over circuit, signal judges that automatic switch-over circuit is by judging the phase relation of Ip and Up;
3) determine the phase shift angle to output PWM inversion driving pulse, then, behind PWM1 and PWM2 difference phase shift 180 degree, PWM1 and PWM2 driving pulse exchange;
4) if driving pulse exchanges, the inverter outbound course will be reverse, and the feedback direction also can be reverse, thus automatic switchover inverter outbound course, thus reach the purpose that the inverter fed direction automaticallyes switch.
Output current signal Ip after the described current sample processing circuit processes, current signal by the sampling of the current sensor T between inverter output end and load input terminal input I1, I2, be converted to voltage signal through resistance R 1, after resistance R 7, input to the negative input of operational amplifier U2A again, affiliated sample rate current signal inputs to the negative input of comparator U3A through current-limiting resistance R11 after operational amplifier U2A is amplified to suitable ratio; Described voltage signal inputs to the end of current-limiting resistance R16 after U3A crosses zero balancing; The other end of current-limiting resistance R16 inputs to the input of isolating optocoupler U4, and current signal Ip is isolated in output after isolating optocoupler U4.
Output voltage signal Up after the described voltage sample isolation processing processing of circuit, by sampled voltage A, B between inverter output end and load input terminal after R2 and R5 bleeder circuit dividing potential drop, seal in the negative phase end of comparator U3B by current-limiting resistance R12, produce a comparative voltage through bleeder circuit, input to the forward end of comparator as the threshold voltage of zero-crossing comparator, this voltage signal is after U3B crosses zero balancing, by the input that optocoupler U5 is isolated in current-limiting resistance R17 input, output isolation voltage signal Up after isolating optocoupler U5.
The judgement of described phase relation to Ip and Up, if the phase place of Up and Ip is leading or the hysteresis angle is spent less than 90, then feed back in the right direction, this moment, the PWM driving pulse phase shift through P10 and P11 output was 0 degree, and the phase shift of the driving pulse PWM1 that exports behind process driver U7A and the U7B and PWM2 is 0 degree; If the phase place of Up and Ip is leading or the hysteresis angle greater than in 90 degree, then feeding back direction connects instead, this moment, the PWM driving pulse phase shift through P10 and P11 output was 180 degree, and the phase shift of the driving pulse PWM1 that exports behind process driver U7A and the U7B and PWM2 is 180 degree.
This induction heating power inverters integrated circuit model is: U1:TMS320F2812; U2:TL084; U3:LM319; U4:6N137; U5:6N137; U6:SN75451; U7:ICL7667.
This induction heating power inverter fed direction-adaptive circuit as shown in Figure 1, be from inverter output end load input terminal A by the sampling buffer circuit, B Direct Sampling voltage, and pass through current sensor T from inverter output end load input terminal sample rate current, electric current output current signal Ip and voltage signal Up after the sampling processing processing of circuit of sampling, Ip and Up are input to signal and judge and automatic switch-over circuit, described signal judgement and automatic switch-over circuit are by judging the phase relation of Ip and Up, determine the phase shift angle to output PWM inversion driving pulse then, thereby automatic switchover inverter outbound course finally reaches the purpose of inverter fed line direction-adaptive.
Described sampling isolation processing circuit is made of voltage sample isolation processing circuit and current sample isolation processing circuit as shown in Figure 2.
Described voltage sample isolation processing circuit is from inverter output end load input terminal sampled voltage A, B goes here and there as current-limiting resistance R12 one end after R2 and R5 bleeder circuit dividing potential drop, the other end of R12 inserts the negative phase end of comparator U3B, the bleeder circuit that is made of R20 and R21 produces the forward end of a comparative voltage input comparator as the threshold voltage of zero-crossing comparator, C5, C6, C8 is filtering capacitor, described voltage signal is imported the end of current-limiting resistance R17 after U3B crosses zero balancing, the input that optocoupler U5 is isolated in the other end input of current-limiting resistance R17, wherein R15 is pull-up resistor, described voltage signal is output isolation voltage signal Up after isolating optocoupler U5, and wherein R4 is pull-up resistor.
Described current sample isolation processing circuit is imported I1 from the inverter output end load input terminal through current sensor T sampling, the current signal of I2, affiliated current signal is converted to the negative input of voltage signal input operational amplifier U2A after resistance R 7 through resistance R 1, wherein R7 and R9 are the multiplication factor that proportion resistor determines operational amplifier, R8 is balance resistance, C3, C4 is filter capacitor, affiliated sample rate current signal is amplified to suitable ratio by the negative input of the comparator U3A of current-limiting resistance R11 input through operational amplifier U2A, the bleeder circuit that is made of R10 and R13 produces the forward end of a comparative voltage input comparator U3A as the threshold voltage of zero-crossing comparator, C1, C2, C9 is filtering capacitor, described voltage signal is imported the end of current-limiting resistance R16 after U3A crosses zero balancing, the input that optocoupler U4 is isolated in the other end input of current-limiting resistance R16, wherein R14 is pull-up resistor, described voltage signal is output isolation voltage signal Ip after isolating optocoupler U4, and wherein R3 is pull-up resistor.
Described signal is judged automatic switch-over circuit input signal Up as shown in Figure 3, Ip is by the output of sampling isolation processing circuit, Up and Ip are input to the input of U6A and U6B respectively, after U6A and U6B level conversion, be input to P00 and the P11 of DSP digital signal processor U1 respectively, the DSP digital signal processor after to isolation processing the sample rate current signal and the phase place of sampled voltage signal judge, wherein R18 and R19 are pull-up resistor, the P10 of DSP signal processor U1 and P11 exported corresponding PWM driving pulse respectively and import reverse driven U7A and U7B respectively after the process judgement was switched, and also oppositely output driving pulse PWM1 and PWM2 give inverter after driver U7A and U7B amplification.
Described sampled voltage, sample rate current through the sampling buffer circuit handle back output sampled voltage signal Up and sample rate current signal Ip as shown in Figure 4 Tr be that the one-period and 360 of sample rate current is spent, y1 is the angle of electric current leading voltage, the perhaps angle of voltage delay electric current, if y1 connects instead greater than 90 degree explanation feedback lines, the commutation circuit action, and the phase shift of PWM driving pulse is 180 degree, if y1 is in the right direction less than 90 degree explanation feedback lines, commutation circuit is failure to actuate, and the phase shift of PWM driving pulse is 0 degree.
Reach phase shift 0 degree before the phase shift of described PWM driving pulse and spend contrast as shown in Figure 5 with phase shift 180, when just being equivalent to PWM1 behind phase shift 180 degree respectively, PWM1 and PWM2 exchange with the PWM2 driving pulse, if driving pulse exchange, the inverter outbound course will be reverse, and thereby the feedback direction also can oppositely reach the purpose that the feedback direction automaticallyes switch, if the phase place of Up and Ip is leading or the hysteresis angle is in the right direction less than 90 degree explanation feedbacks, this moment, the PWM driving pulse phase shift through P10 and P11 output was 0 degree, and the phase shift of the driving pulse PWM1 that exports behind process driver U7A and the U7B and PWM2 is 0 degree; If the phase place of Up and Ip is leading or the hysteresis angle connects instead greater than feeding back directions in 90 degree explanations, this moment, the PWM driving pulse phase shift through P10 and P11 output was 180 degree, and be 180 degree through the driving pulse PWM1 that exports behind driver U7A and the U7B and the phase shift of PWM2, this moment, the inverter fed direction realized automatic switchover and induction heating power inverter fed direction-adaptive as mentioned above.
Claims (8)
1. induction heating power inverter fed direction-adaptive circuit, it is characterized in that, comprise: sampling isolation processing circuit and signal are judged automatic switch-over circuit, described sampling isolation processing circuit is made up of voltage sample isolation processing circuit and current sample isolation processing circuit, the input of described current sample isolation processing circuit be connected in and inverter output end and load input terminal between cable on, the output of current sample isolation processing circuit and signal judge that the current input terminal of automatic switch-over circuit links to each other; The input of voltage sample isolation processing circuit be connected in and inverter output end and load input terminal between cable A, the B two ends of voltage, the output of voltage sample isolation processing circuit judges that with signal the voltage input end of automatic switch-over circuit links to each other; Described signal judges that the output of automatic switch-over circuit links to each other with the PWM end of inverter.
2. a kind of induction heating power inverter fed direction-adaptive circuit according to claim 1, it is characterized in that, described current sample isolation processing circuit is made up of current sensor T, integrated circuit U2A, U3 A and optocoupler U4, wherein integrated circuit U2A is operational amplifier, resistance R 7 is the proportion resistor of operational amplifier multiplication factor with R9, R8 is balance resistance, and capacitor C 3, C4 are filter capacitor; Described integrated circuit U3 A is zero-crossing comparator.
3. a kind of induction heating power inverter fed direction-adaptive circuit according to claim 1, it is characterized in that, described voltage sample isolation processing circuit is connected to form by integrated circuit U3 B and mistake zero balancing bleeder circuit, optocoupler U5 by the sampling bleeder circuit, described sampling bleeder circuit is made of resistance R 2 and R5, and described integrated circuit U3 B is comparator.
4. a kind of induction heating power inverter fed direction-adaptive circuit according to claim 1, it is characterized in that, described signal judges that automatic switch-over circuit is linked to each other with the P1 end with the P0 end of integrated circuit U1 respectively by the output of integrated circuit U6A, U6B, the input of integrated circuit U6A links to each other with electric current isolation processing circuit, and the input of integrated circuit U6B links to each other with voltage isolation processing circuit; The P10 end of described integrated circuit U1 links to each other with the input of integrated circuit U7A, U7B respectively with the P11 end, and the output of integrated circuit U7A, U7B links to each other with the PWM end of inverter respectively.
5. the method for a kind of induction heating power inverter fed direction-adaptive of circuit according to claim 1, it is characterized in that: its step is as follows:
1), holds the voltage of Direct Sampling, output voltage signal Up after voltage sample isolation processing processing of circuit by A, B between inverter output end and load input terminal; The electric current of while current sensor T from sampling between inverter output end and load input terminal, output current signal Ip after the current sample processing circuit processes;
2), current signal Ip and voltage signal Up be input to signal and judge automatic switch-over circuit, signal judges that automatic switch-over circuit is by judging the phase relation of Ip and Up;
3) determine the phase shift angle to output PWM inversion driving pulse, then, behind PWM1 and PWM2 difference phase shift 180 degree, PWM1 and PWM2 driving pulse exchange;
4) if driving pulse exchanges, the inverter outbound course will be reverse, and the feedback direction also can be reverse, thus automatic switchover inverter outbound course, thus reach the purpose that the inverter fed direction automaticallyes switch.
6. as the method for a kind of induction heating power inverter fed direction-adaptive as described in the claim 5, it is characterized in that: the output current signal Ip after the described current sample processing circuit processes, current signal by the sampling of the current sensor T between inverter output end and load input terminal input I1, I2, be converted to voltage signal through resistance R 1, after resistance R 7, input to the negative input of operational amplifier U2A again, affiliated sample rate current signal inputs to the negative input of comparator U3A through current-limiting resistance R11 after operational amplifier U2A is amplified to suitable ratio; Described voltage signal inputs to the end of current-limiting resistance R16 after U3A crosses zero balancing; The other end of current-limiting resistance R16 inputs to the input of isolating optocoupler U4, and current signal Ip is isolated in output after isolating optocoupler U4.
7. as the method for a kind of induction heating power inverter fed direction-adaptive as described in the claim 5, it is characterized in that: the output voltage signal Up after the described voltage sample isolation processing processing of circuit, by the sampled voltage A between inverter output end and load input terminal, B is after R2 and R5 bleeder circuit dividing potential drop, seal in the negative phase end of comparator U3B by current-limiting resistance R12, produce a comparative voltage through bleeder circuit, input to the forward end of comparator as the threshold voltage of zero-crossing comparator, this voltage signal is after U3B crosses zero balancing, by the input that optocoupler U5 is isolated in current-limiting resistance R17 input, output isolation voltage signal Up after isolating optocoupler U5.
8. as the method for a kind of induction heating power inverter fed direction-adaptive as described in the claim 5, it is characterized in that: the judgement of described phase relation to Ip and Up,
If the phase place of Up and Ip is leading or the hysteresis angle less than 90 degree, then feed back in the right directionly, this moment, the PWM driving pulse phase shift through P10 and P11 output was 0 degree, and was 0 degree through the driving pulse PWM1 that exports behind driver U7A and the U7B and the phase shift of PWM2;
If the phase place of Up and Ip is leading or the hysteresis angle greater than in 90 degree, then feeding back direction connects instead, this moment, the PWM driving pulse phase shift through P10 and P11 output was 180 degree, and the phase shift of the driving pulse PWM1 that exports behind process driver U7A and the U7B and PWM2 is 180 degree.
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