CN211123805U - Induction heating rapid temperature control system - Google Patents
Induction heating rapid temperature control system Download PDFInfo
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- CN211123805U CN211123805U CN201922231872.XU CN201922231872U CN211123805U CN 211123805 U CN211123805 U CN 211123805U CN 201922231872 U CN201922231872 U CN 201922231872U CN 211123805 U CN211123805 U CN 211123805U
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Abstract
The utility model discloses a quick temperature control system of induction heating, including DSP chip, conversion module and infrared radiation thermometer, infrared radiation thermometer and conversion module are connected, and conversion module and DSP chip are connected, conversion module includes measuring circuit, filter circuit, voltage follower circuit, voltage feedback circuit and fortune with the circuit. The utility model provides an among the quick temperature control system of induction heating, the infrared thermometer carries the 4-20mA signal of coming to pass to the DSP chip through conversion module, and conversion module is difficult to receive infrared thermometer's change interference, prevents that the DSP chip from being damaged by interfering signal, and temperature control system's stability is better. The linear optical coupler of the conversion module is provided with one path of input and two paths of output, wherein one path of input is connected to the voltage feedback circuit in a negative feedback mode, and the high stability of the conversion module is kept.
Description
Technical Field
The utility model belongs to the induction heating field, concretely relates to quick temperature control system of induction heating.
Background
The modern induction heating power supply technology is a multidisciplinary edge crossing technology which applies power electronic semiconductor devices, integrates an automatic control theory, a computer (microprocessor) technology, an electromagnetic technology and the like. With the development of industry, the application of induction heating power supplies is increasingly wide, and the current induction heating power supplies as energy-saving and efficient heating heat treatment equipment are developing towards the directions of full solid state, high frequency and high power, green product performance and intelligent control mode.
Because the intellectualization and the digitalization of the induction heating equipment are in a trend, the digitalized temperature control technology is applied to an induction heating equipment system, the applicability of the equipment can be increased, the equipment is convenient to modify temperature control parameters, and the updating is simple. The temperature control is the core technology of induction heating, and good temperature control circuit system is favorable to improving the qualification rate of product, improves the availability factor of equipment, in order to better realize the quick control of induction heating temperature, reduces the defective rate of product, it is necessary to design a quick temperature control system of induction heating.
SUMMERY OF THE UTILITY MODEL
To the demand among the prior art of writing, the utility model aims at providing a quick temperature control system of induction heating.
The purpose of the utility model is realized through the following technical scheme.
The utility model provides a quick temperature control system of induction heating, includes DSP chip, conversion module and infrared thermometer, and infrared thermometer and conversion module are connected, and conversion module and DSP chip are connected, the conversion module includes measuring circuit, filter circuit, voltage follower circuit, voltage feedback circuit and fortune will the circuit, and infrared thermometer and measuring circuit are connected, and measuring circuit and filter circuit are connected, and filter circuit and voltage follower circuit are connected, and voltage follower circuit and voltage feedback circuit are connected, and voltage feedback circuit and fortune will the circuit connection, fortune will the circuit and DSP chip connect.
The measuring circuit comprises a first resistor, a second resistor and a third resistor, the first resistor, the second resistor and the third resistor are connected in parallel, the input end of the measuring circuit is connected with the output end of the infrared thermometer, and the output end of the measuring circuit is respectively connected with the filter circuit and grounded at 5V.
The filter circuit comprises a first capacitor, a fourth resistor and a second capacitor, one end of the fourth resistor is connected with the output end of the measuring circuit, the other end of the fourth resistor is connected with the input end of the voltage follower, and two ends of the fourth resistor are grounded through the first capacitor and the second capacitor by 5V respectively.
The voltage following circuit comprises a first operational amplifier and a fifth resistor, the fourth resistor is connected with the non-inverting input end of the first operational amplifier, the output end of the first operational amplifier is connected with the voltage feedback circuit, the output end of the first operational amplifier is further connected with the inverting input end of the first operational amplifier through the fifth resistor, and the voltage end of the first operational amplifier is respectively connected with 5V voltage and 5V grounding.
The voltage feedback circuit comprises a sixth resistor, a seventh resistor, an eighth resistor, a second operational amplifier, a third operational amplifier, a linear optical coupler, a third capacitor and a fourth capacitor, one end of the sixth resistor is connected with the output end of the voltage follower circuit, the other end of the sixth resistor is connected with the inverting input end of the second operational amplifier, the output end of the second operational amplifier is connected with the first pin of the linear optical coupler through the seventh resistor, the output end of the second operational amplifier is also connected with the inverting input end of the second operational amplifier through the third capacitor, the second pin of the linear optical coupler is connected with 5V voltage, the third pin and the fourth pin of the linear optical coupler are respectively connected with the inverting input end and the non-inverting input end of the second operational amplifier, and the fifth pin and the sixth pin of the linear optical coupler are respectively connected with the non-inverting input end and the inverting input end of the third operational amplifier, the fourth pin 5V of the linear optical coupler is grounded, the fifth pin of the linear optical coupler is grounded, the output end of the third operational amplifier is connected with the operational amplifier circuit, and the output end of the third operational amplifier is connected with the inverting input end of the third operational amplifier through an eighth resistor and a fourth capacitor which are connected in parallel.
The operational amplifier circuit comprises a ninth resistor, a tenth resistor, an eleventh resistor, a twelfth resistor and a fourth operational amplifier, one end of the ninth resistor is connected with the output end of the voltage feedback circuit, the other end of the ninth resistor is connected with the non-inverting input end of the fourth operational amplifier, the output end of the fourth operational amplifier is connected with the DSP chip, the output end of the fourth operational amplifier is further connected with the inverting input end of the fourth operational amplifier through the tenth resistor and the eleventh resistor which are connected in series, the output end of the fourth operational amplifier is grounded through the twelfth resistor, and the voltage end of the fourth operational amplifier is respectively connected with VCC and grounded.
The utility model has the advantages that: the utility model provides an among the quick temperature control system of induction heating, the infrared thermometer carries the 4-20mA signal of coming to pass to the DSP chip through conversion module, and conversion module is difficult to receive infrared thermometer's change interference, prevents that the DSP chip from being damaged by interfering signal, and temperature control system's stability is better. The linear optical coupler of the conversion module is provided with one path of input and two paths of output, wherein one path of input is connected to the voltage feedback circuit in a negative feedback mode, and the high stability of the conversion module is kept.
Drawings
Fig. 1 is a schematic structural diagram of the present invention.
Fig. 2 is a circuit diagram of a part of the conversion module of the present invention.
Fig. 3 is a circuit diagram of another part of the conversion module of the present invention.
Detailed Description
As shown in fig. 1, 2 and 3, an induction heating rapid temperature control system comprises a DSP chip, a conversion module and an infrared thermometer, wherein the infrared thermometer is connected to the conversion module, the conversion module is connected to the DSP chip, and the conversion module is configured to convert a 4-20mA current signal transmitted by the infrared thermometer into a voltage signal and transmit the voltage signal to the DSP chip. The conversion module comprises a measuring circuit, a filter circuit, a voltage following circuit, a voltage feedback circuit and a connecting circuit, wherein the infrared thermometer is connected with the measuring circuit, the measuring circuit is connected with the filter circuit, the filter circuit is connected with the voltage following circuit, the voltage following circuit is connected with the voltage feedback circuit, the voltage feedback circuit is connected with the connecting circuit, and the connecting circuit is connected with the DSP chip. The DSP chip selects a TMS320F2812 chip. Wherein fig. 2 and fig. 3 constitute a complete conversion module circuit diagram.
In the induction heating process, the object to be detected is heated by the induction heating power supply, and the heated object can generate infrared light. The infrared light outputs a 4-20mA current signal through the infrared thermometer, the signal is input into the conversion module through the cable, then the signal is converted into a voltage signal through the conversion module, and the voltage signal is transmitted to the AD conversion pin of the DSP chip through the cable. After the DSP chip receives the voltage signal, analog-to-digital conversion is carried out on the voltage signal, a temperature value is calculated according to the digital quantity, chopping driving is changed through operation of the DSP chip, and therefore chopping and full-bridge inversion are affected, output power of a power supply is changed, and finally the temperature of an object to be measured is required. Regarding the operation inside the DSP chip, the present invention is not described in detail for the common general knowledge in the art.
The measuring circuit comprises a first resistor R1, a second resistor R2 and a third resistor R3, the first resistor R1, the second resistor R2 and the third resistor R3 are connected in parallel, the input end of the measuring circuit is connected with the output end of the infrared thermometer, and the output end of the measuring circuit is respectively connected with the filter circuit and 5V ground. The 5V ground means that the negative electrode potential of the connected power supply is + 5V.
The filter circuit comprises a first capacitor C1, a fourth resistor R4 and a second capacitor C2, one end of the fourth resistor R4 is connected with the output end of the measuring circuit, the other end of the fourth resistor R4 is connected with the input end of the voltage follower, and two ends of the fourth resistor R4 are grounded at 5V after passing through the first capacitor C1 and the second capacitor C2 respectively.
The voltage follower circuit comprises a first operational amplifier G1 and a fifth resistor R5, the fourth resistor R4 is connected with the non-inverting input end of the first operational amplifier G1, the output end of the first operational amplifier G1 is connected with the voltage feedback circuit, the output end of the first operational amplifier G1 is further connected with the inverting input end of the first operational amplifier G1 through the fifth resistor R5, and the voltage end of the first operational amplifier G1 is respectively connected with 5V voltage and 5V ground.
The voltage feedback circuit comprises a sixth resistor R6, a seventh resistor R7, an eighth resistor R8, a second operational amplifier G2, a third operational amplifier G3, a linear optical coupler, a third capacitor C3 and a fourth capacitor C4, one end of the sixth resistor R6 is connected with the output end of the voltage follower circuit, the other end of the sixth resistor R6 is connected with the inverting input end of the second operational amplifier G2, the output end of the second operational amplifier G2 is connected with the first pin of the linear optical coupler through the seventh resistor R7, the output end of the second operational amplifier G2 is further connected with the inverting input end of the second operational amplifier G2 through the third capacitor C3, the second pin of the linear optical coupler is connected with 5V voltage, the third pin and the fourth pin of the linear optical coupler are respectively connected with the inverting input end and the non-inverting input end of the second operational amplifier G2, the fifth pin and the sixth pin of the linear optical coupler are respectively connected with the non-inverting input end and the inverting input end of the third operational amplifier G3, the fourth pin 5V of the linear optical coupler is grounded, the fifth pin of the linear optical coupler is grounded, the output end of the third operational amplifier G3 is connected with the operational amplifier circuit, and the output end of the third operational amplifier G3 is connected with the inverting input end of the third operational amplifier G3 through an eighth resistor R8 and a fourth capacitor C4 which are connected in parallel. The model of the linear optocoupler is HCNR200, and 1, 2, 3, 4, 5, and 6 marked on the linear optocoupler HCNR200 in fig. 2 and 3 are a first pin, a second pin, a third pin, a fourth pin, a fifth pin, and a sixth pin of the linear optocoupler, respectively.
The operational amplifier circuit comprises a ninth resistor R9, a tenth resistor R10, an eleventh resistor R11, a twelfth resistor R12 and a fourth operational amplifier G4, wherein one end of the ninth resistor R9 is connected with the output end of the voltage feedback circuit, the other end of the ninth resistor R9 is connected with the non-inverting input end of the fourth operational amplifier G4, the output end of the fourth operational amplifier G4 is connected with the DSP chip, the output end of the fourth operational amplifier G4 is further connected with the inverting input end of the fourth operational amplifier G4 through the tenth resistor R10 and the eleventh resistor R11 which are connected in series, the output end of the fourth operational amplifier G4 is connected with VCC and ground respectively through the twelfth resistor R12.
The working mode of the conversion module is as follows: the conversion module circuit of the present invention is arranged according to the above connection relationship, wherein the resistance values of the first resistor R1, the second resistor R2 and the third resistor R3 are as shown in fig. 2. After the 4-20mA current transmitted by the infrared thermometer is measured by the first resistor R1, the second resistor R2 and the third resistor R3 which are connected in parallel, obtaining the voltage of 0.66V-3.3V, and then passing through a filter circuit consisting of a first capacitor C1, a fourth resistor R4 and a second capacitor C2, through a voltage follower circuit (a first operational amplifier G1 and a fifth resistor R5), the voltage signal then passes through a voltage feedback circuit consisting of a sixth resistor R6, a seventh resistor R7, an eighth resistor R8, a second operational amplifier G2, a third operational amplifier G3, a linear optical coupler HCNR200, a third capacitor C3 and a fourth capacitor C4, when the output voltage of the voltage follower circuit is increased, the output voltage of the second operational amplifier G2 is increased, the level of the first pin of the linear optical coupler is pulled low, the level of a fourth pin of the linear optical coupler is raised, and the input voltage of the third operational amplifier G3 is increased; on the contrary, if the output voltage of the voltage follower circuit is reduced, the output voltage of the second operational amplifier G2 is reduced, the level of the first pin of the linear optical coupler is raised, so that the level of the fourth pin of the linear optical coupler is pulled down, the input voltage of the third operational amplifier G3 is reduced, thereby generating feedback, and finally, the voltage tends to be stable. Finally, the voltage output by the third operational amplifier G3 passes through a transfer circuit composed of a ninth resistor R9, a tenth resistor R10, an eleventh resistor R11, a twelfth resistor R12 and a fourth operational amplifier G4, and an output voltage signal is sent to the DSP chip.
And then the DSP chip adjusts the power of the induction heating equipment according to the acquired temperature value. Preferably, the adjustment method uses a digital PID control algorithm, i.e., controls the output power of the power supply by controlling the duty ratio of the chopped PWM signal, thereby controlling the temperature of the heated object. The digital PID control algorithm is a conventional technical means in the field, and the utility model does not describe the subsequent power adjustment and the digital PID control algorithm in detail.
The above description is only a preferred embodiment of the present invention, and is not a limitation to the technical solution of the present invention, it should be noted that, further improvements and changes can be made by those skilled in the art on the premise of the technical solution of the present invention, and all such improvements and changes should be covered in the protection scope of the present invention.
Claims (6)
1. The utility model provides a quick temperature control system of induction heating, includes DSP chip, conversion module and infrared thermometer, and infrared thermometer and conversion module are connected, and conversion module and DSP chip are connected, its characterized in that: the conversion module comprises a measuring circuit, a filter circuit, a voltage following circuit, a voltage feedback circuit and a connecting circuit, wherein the infrared thermometer is connected with the measuring circuit, the measuring circuit is connected with the filter circuit, the filter circuit is connected with the voltage following circuit, the voltage following circuit is connected with the voltage feedback circuit, the voltage feedback circuit is connected with the connecting circuit, and the connecting circuit is connected with the DSP chip.
2. The induction heating rapid temperature control system of claim 1, wherein: the measuring circuit comprises a first resistor, a second resistor and a third resistor, the first resistor, the second resistor and the third resistor are connected in parallel, the input end of the measuring circuit is connected with the output end of the infrared thermometer, and the output end of the measuring circuit is respectively connected with the filter circuit and grounded at 5V.
3. The induction heating rapid temperature control system of claim 2, wherein: the filter circuit comprises a first capacitor, a fourth resistor and a second capacitor, one end of the fourth resistor is connected with the output end of the measuring circuit, the other end of the fourth resistor is connected with the input end of the voltage follower, and two ends of the fourth resistor are grounded through the first capacitor and the second capacitor by 5V respectively.
4. The induction heating rapid temperature control system of claim 3, wherein: the voltage following circuit comprises a first operational amplifier and a fifth resistor, the fourth resistor is connected with the non-inverting input end of the first operational amplifier, the output end of the first operational amplifier is connected with the voltage feedback circuit, the output end of the first operational amplifier is further connected with the inverting input end of the first operational amplifier through the fifth resistor, and the voltage end of the first operational amplifier is respectively connected with 5V voltage and 5V grounding.
5. The induction heating rapid temperature control system of claim 4, wherein: the voltage feedback circuit comprises a sixth resistor, a seventh resistor, an eighth resistor, a second operational amplifier, a third operational amplifier, a linear optical coupler, a third capacitor and a fourth capacitor, one end of the sixth resistor is connected with the output end of the voltage follower circuit, the other end of the sixth resistor is connected with the inverting input end of the second operational amplifier, the output end of the second operational amplifier is connected with the first pin of the linear optical coupler through the seventh resistor, the output end of the second operational amplifier is also connected with the inverting input end of the second operational amplifier through the third capacitor, the second pin of the linear optical coupler is connected with 5V voltage, the third pin and the fourth pin of the linear optical coupler are respectively connected with the inverting input end and the non-inverting input end of the second operational amplifier, and the fifth pin and the sixth pin of the linear optical coupler are respectively connected with the non-inverting input end and the inverting input end of the third operational amplifier, the fourth pin 5V of the linear optical coupler is grounded, the fifth pin of the linear optical coupler is grounded, the output end of the third operational amplifier is connected with the operational amplifier circuit, and the output end of the third operational amplifier is connected with the inverting input end of the third operational amplifier through an eighth resistor and a fourth capacitor which are connected in parallel.
6. The induction heating rapid temperature control system of claim 5, wherein: the operational amplifier circuit comprises a ninth resistor, a tenth resistor, an eleventh resistor, a twelfth resistor and a fourth operational amplifier, one end of the ninth resistor is connected with the output end of the voltage feedback circuit, the other end of the ninth resistor is connected with the non-inverting input end of the fourth operational amplifier, the output end of the fourth operational amplifier is connected with the DSP chip, the output end of the fourth operational amplifier is further connected with the inverting input end of the fourth operational amplifier through the tenth resistor and the eleventh resistor which are connected in series, the output end of the fourth operational amplifier is grounded through the twelfth resistor, and the voltage end of the fourth operational amplifier is respectively connected with VCC and grounded.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922231872.XU CN211123805U (en) | 2019-12-13 | 2019-12-13 | Induction heating rapid temperature control system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922231872.XU CN211123805U (en) | 2019-12-13 | 2019-12-13 | Induction heating rapid temperature control system |
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| Publication Number | Publication Date |
|---|---|
| CN211123805U true CN211123805U (en) | 2020-07-28 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201922231872.XU Active CN211123805U (en) | 2019-12-13 | 2019-12-13 | Induction heating rapid temperature control system |
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| CN (1) | CN211123805U (en) |
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- 2019-12-13 CN CN201922231872.XU patent/CN211123805U/en active Active
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