CN112072902A - High-frequency induction heating device - Google Patents
High-frequency induction heating device Download PDFInfo
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- CN112072902A CN112072902A CN202010882754.XA CN202010882754A CN112072902A CN 112072902 A CN112072902 A CN 112072902A CN 202010882754 A CN202010882754 A CN 202010882754A CN 112072902 A CN112072902 A CN 112072902A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/12—Arrangements for reducing harmonics from ac input or output
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/44—Circuits or arrangements for compensating for electromagnetic interference in converters or inverters
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M5/00—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases
- H02M5/40—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B6/00—Heating by electric, magnetic or electromagnetic fields
- H05B6/02—Induction heating
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- General Induction Heating (AREA)
Abstract
The invention relates to a high-frequency induction heating device, which comprises a remote rectifying and filtering circuit, a remote control circuit, a remote input and output device and a plurality of high-frequency induction heating power supply circuits, wherein the power supply circuits are provided with a noise filtering circuit, a three-phase bridge type uncontrolled rectifying circuit, a filtering circuit, a chopping power-adjusting inverter circuit and a resonant circuit which are sequentially connected, the power supply circuits are also provided with a rectifying and filtering circuit and a control drive protection circuit which are sequentially connected, the noise filtering circuit is provided with a three-phase power supply input end, the rectifying and filtering circuit is provided with a two-phase power supply input end, the control output end of the control drive protection circuit is connected with the control input end of the chopping power-adjusting inverter circuit, the output end of the remote rectifying and filtering circuit is connected with the remote control circuit, and the remote. The invention is suitable for occasions needing to respectively perform electromagnetic induction heating on different positions of a space, and has excellent anti-interference performance and good stability.
Description
Technical Field
The invention relates to a multi-power high-frequency induction heating device which is suitable for equipment needing electromagnetic induction heating at different spatial positions.
Background
The electromagnetic induction heating device is powered on by an induction coil in the electromagnetic induction heating device to generate heat and provide heat outwards, the induction coil is a load, a high-frequency induction heating power supply is responsible for getting electricity from a power grid, a series of processing and transformation are carried out, and then suitable specific frequency and power output are provided for the load. High frequency induction heating device is more and more applied to industrial fields such as metal heat treatment or hot working, not only required output frequency and power increase gradually, the high frequency induction heating point that needs also has the trend of increasing on same relevant equipment, and the heating requirement of different heating points is also different, make high frequency induction heating device's complexity increase, and because the phenomenon that the current high frequency induction heating power ubiquitous produces wide band higher harmonic in the contravariant process and concatenates electric wire netting and power self control circuit, on the one hand cause adverse effect to the electric wire netting, on the other hand causes control circuit unstability easily, reduce the stability of whole power from this, cause inverter circuit's components and parts to damage even easily. When some equipment need use a plurality of high frequency induction heating power to carry out high-frequency high-power electromagnetic induction heating respectively to different spatial position, mutual interference between the power will be more serious, seriously influences whole heating device's stability and reliability.
Disclosure of Invention
The invention aims to provide a high-frequency induction heating device which is suitable for occasions needing high-frequency high-power electromagnetic induction heating on different spatial positions respectively, and has excellent anti-interference performance and good stability.
The main technical scheme of the invention is as follows:
the high-frequency induction heating device comprises a remote rectifying and filtering circuit, a remote control circuit, a remote input and output device and a plurality of high-frequency induction heating power supply circuits, wherein the high-frequency induction heating power supply circuits are provided with a noise filtering circuit, a three-phase bridge type uncontrolled rectifying circuit, a filtering circuit, a chopping power-adjusting inverter circuit and a resonant circuit which are connected in sequence, the high-frequency induction heating power supply circuits are also provided with a rectifying and filtering circuit and a control driving protection circuit which are connected in sequence, the noise filtering circuit is provided with a three-phase power supply input end, the rectifying and filtering circuit is provided with a two-phase power supply input end, the control output end of the control driving protection circuit is connected with the control input end of the chopping power-adjusting inverter circuit, a first current sensor is arranged between the noise filtering circuit and the three-phase bridge type uncontrolled rectifying circuit, and a first voltage, the output end of the resonance circuit is provided with a second current sensor and a second voltage sensor, the signal output ends of the first current sensor, the second current sensor, the first voltage sensor and the second voltage sensor are respectively connected with the input current detection end, the output current detection end, the input voltage detection end and the output voltage detection end of the control drive protection circuit, the output end of the remote rectification filter circuit is connected with a remote control circuit, and the remote control circuit is connected with the remote input and output device and each control drive protection circuit in a two-way communication manner.
The control drive protection circuit comprises a control submodule, a drive submodule and a protection submodule, wherein the control submodule is the core of the control drive protection circuit, the control submodule receives measurement result signals from a first current sensor, a second current sensor, a first voltage sensor and a second voltage sensor and outputs protection control signals and drive control signals to the drive submodule and the protection submodule respectively, and the drive submodule outputs drive signals to the chopping power-regulating inverter circuit.
The high-frequency induction heating power supply circuit can further comprise a local input device and a local output device, the local input device and the local output device are both connected to the control drive protection circuit, the control word sent by the remote control circuit to the control drive protection circuit comprises a remote/local control word, when the remote/local control word is 1, the control drive protection circuit controls the local input device to be in a disabled state, and when the remote/local control word is 0, the control drive protection circuit controls the local input device to be in an enabled state.
Each high-frequency induction heating power supply circuit is independently arranged in a metal shell, and the resonance circuit and the control drive protection circuit are respectively arranged in different cavities.
The noise filter circuit can be provided with a plurality of parallel filter branches, each filter branch is controlled to be on or off by an electronic switch, the control input end of the electronic switch is connected with the control drive protection circuit, and the filter branches at least comprise three filter branches which are respectively used for eliminating third harmonic, fifth harmonic and seventh harmonic generated by the chopping power-adjusting inverter circuit.
The invention has the beneficial effects that:
the main loop of each high-frequency induction heating power supply circuit adopts a three-phase bridge type uncontrolled rectifying circuit without any execution circuit, the generated harmonic voltage and harmonic current are very small, the generation of higher harmonics is greatly inhibited from the source, the pollution and the influence on a power grid are very small, and the circuit is simple and has good stability.
The noise filter circuit is arranged at the front end of the three-phase bridge type uncontrolled rectifying circuit, so that higher harmonics generated in the inversion process of main loops of a plurality of heating power supplies can be further prevented from being connected into a power grid and a control loop in series, and the harmonics in the power grid are prevented from damaging related components of the rectification and inversion links of the main loops, so that the problem of interference when a plurality of sets of high-power induction heating power supplies are used on the same high-frequency induction heating device can be effectively solved.
According to the invention, the rectification filter circuit is arranged at the front end of the control drive protection circuit, so that higher harmonics in the inversion process of the main loop can be prevented from being reversely connected to the control loop, the safety of the whole high-frequency induction heating power supply is further ensured, and the voltage and the current of the control loop are more stable.
The noise filter circuit and the rectification filter circuit are respectively adopted on the main circuit and the control branch circuit of each high-frequency induction heating power supply circuit, so that the anti-interference capability of the whole heating power supply circuit is obviously enhanced, and the stability is obviously improved.
The invention can realize that a plurality of sets of high-power heating power supplies on the same high-frequency induction heating device can operate independently, and have no higher harmonic interference, the work is stable and reliable, and the use requirements that one induction heating device needs to provide a plurality of induction heating points at different positions and can operate independently or be linked can be met.
Drawings
FIG. 1 is a schematic block circuit diagram of one embodiment of the present invention.
Detailed Description
The invention discloses a high-frequency induction heating device which comprises a remote rectifying and filtering circuit, a remote control circuit, a remote input and output device and a plurality of high-frequency induction heating power supply circuits, wherein the situation that two high-frequency induction heating power supply circuits are included is shown in figure 1. The high-frequency induction heating power supply circuit is provided with a noise filter circuit, a three-phase bridge type uncontrolled rectifier circuit, a filter circuit, a chopping power-adjusting inverter circuit and a resonance circuit which are connected in sequence, the high-frequency induction heating power supply circuit is also provided with a rectifier filter circuit and a control drive protection circuit which are connected in sequence, the noise filter circuit is provided with a three-phase power supply input end and is connected to a three-phase power supply during operation, the rectifier filter circuit is provided with a two-phase power supply input end, the control output end of the control drive protection circuit is connected with the control input end of the chopping power-adjusting inverter circuit, a first current sensor is arranged between the noise filter circuit and the three-phase bridge type uncontrolled rectifier circuit, a first voltage sensor is arranged between the filter circuit and the chopping power-adjusting inverter circuit, and the output end of the resonance circuit is provided, the signal output ends of the first current sensor, the second current sensor, the first voltage sensor and the second voltage sensor are respectively connected to an input current detection end, an output current detection end, an input voltage detection end and an output voltage detection end of the control drive protection circuit, the output end of the remote rectification filter circuit is connected with a remote control circuit, and the remote control circuit is connected with the remote input and output device and each control drive protection circuit in a two-way communication mode.
The high-frequency induction heating power supply circuit is mainly used for supplying power to an induction coil of the electromagnetic induction heating device. And a branch circuit consisting of the noise filter circuit, the three-phase bridge type uncontrolled rectifying circuit, the filter circuit, the chopping power-regulating inverter circuit and the resonance circuit is a main circuit for bearing the electric energy conversion task.
The branch circuit formed by the rectification filter circuit and the control drive protection circuit is a control loop which mainly bears the internal control task of the power circuit. The control drive protection circuit is a control center of the high-frequency induction heating power supply circuit and comprises a plurality of sub-modules of control, drive, protection and the like, wherein the control sub-module is the core of the control drive protection circuit. The control submodule receives measurement result signals from the first current sensor, the second current sensor, the first voltage sensor and the second voltage sensor, outputs driving signals to the driving submodule through phase tracking according to detection results of the second current sensor and the second voltage sensor, regulates and controls the operation of the chopping power-regulating inverter circuit by using the driving submodule, and comprises the steps of controlling inverter frequency and output power, judging the over-current and over-voltage conditions of a local circuit according to detection result data of each current sensor and each voltage sensor, and controlling the protection submodule to start a protection mode if necessary, for example, controlling the chopping power-regulating inverter circuit to stop working and the like.
The remote control circuit and the control drive protection circuit are also respectively connected with an alarm indicating device, such as an LED lamp, a buzzer and the like.
Because the three-phase bridge type uncontrolled rectifying circuit is adopted in the main loop, any execution circuit is not needed, the generated harmonic voltage and harmonic current are very small, the generation of higher harmonics is greatly inhibited from the source, the pollution and the influence on a power grid are very small, and the circuit is simple and has good stability. The noise filter circuit is arranged at the front end of the three-phase bridge type uncontrolled rectifying circuit, so that higher harmonics generated by a plurality of main circuits of the heating power supplies in the inversion process can be further prevented from being connected into a power grid and a control circuit in series, and the harmonics in the power grid are prevented from damaging related components in the rectification and inversion links of the main circuits, so that the problem of interference when a plurality of sets of high-power induction heating power supplies are used on the same high-frequency induction heating device can be effectively solved.
Because the front end of the control drive protection circuit is provided with the rectifying and filtering circuit, higher harmonics in the inversion process of the main loop can be prevented from being connected to the control loop in a reverse mode, the safety of the whole high-frequency induction heating power supply is further ensured, and meanwhile, the voltage and the current of the control loop are more stable.
The noise filter circuit, the three-phase bridge type uncontrolled rectifying circuit, the filter circuit and the rectifying and filtering circuit are arranged, so that the stability of a single high-frequency induction heating power supply is higher, and the stability and the anti-interference performance of a plurality of sets of induction heating power supplies in the same high-frequency induction heating device are guaranteed.
The noise filter circuit can be provided with a plurality of parallel filter branches, each filter branch is controlled to be switched on and off by an electronic switch, and the control input end of the electronic switch is connected with the control drive protection circuit. The filtering branches at least comprise three filtering branches which are respectively used for eliminating third harmonic, fifth harmonic and seventh harmonic which are mainly generated by the chopping power-regulating inverter circuit. The control drive protection circuit can control the on-off of each electronic switch, and different filtering branches or filtering branch combinations are started to eliminate specific subharmonics.
The high-frequency induction heating power supply circuit can further comprise a local input device and a local output device, the local input device and the local output device are both connected to the control drive protection circuit, the control words sent to the control drive protection circuit by the remote control circuit comprise remote/local control words, when the remote/local control words are 1, the control drive protection circuit controls the local input device to be in a forbidden state, and the control drive protection circuit only receives input control instructions and parameters from the remote control circuit and is used for realizing the remote control of each high-frequency induction heating power supply circuit. When the remote/local control word is 0, the control drive protection circuit controls the local input device to be in an allowable state, and the input priority of the local input device is higher than that of the remote input/output device, so that the local control of the high-frequency induction heating power supply circuit is realized.
The output part of the local output device and the remote input/output device can be used for displaying the state of the heating power supply, displaying the operating parameters (such as current, voltage, temperature, frequency and the like), displaying the user setting parameters, displaying alarm information and the like, and the input part of the local input device and the remote input/output device can be used for inputting the setting parameters, control instructions and the like.
The high-frequency induction heating power circuit is further provided with a main loop power switch, the main loop power switch is located at the front end of the noise filter circuit, and the switch control output end of the protection submodule is connected with the control input end of the main loop power switch. And if necessary, the protection submodule can control the whole high-frequency induction heating power circuit to be closed.
Every high frequency induction heating power supply circuit independently sets up in a metal casing, just resonance circuit and control drive protection circuit set up respectively in different cavitys, and furthest eliminates the electromagnetic interference between a plurality of high frequency induction heating power supply circuit and the electromagnetic interference of major loop to control circuit, further ensures the stability of high frequency induction heating device work.
The power device in the chopping power-adjusting inverter circuit adopts a high-efficiency IGBT module, for example, a bridge inverter circuit is formed by the IGBT module, so that the electric energy conversion efficiency can be obviously improved, the energy-saving effect is obvious, and the harmonic pollution can be favorably reduced.
The first current sensor and the second current sensor include, but are not limited to, current transformers, and the voltage sensor includes, but is not limited to, a voltage transformer for isolated measurement of the main loop.
The two-phase power input end of the rectification filter circuit can be directly connected to a power grid or connected to the power input end of the noise filter circuit, and power is taken from the power input end of the noise filter circuit, so that the interface structure of the whole power supply is simplified.
The invention can be used on metal hot working or heat treatment equipment, respectively carries out high-frequency induction heating on a plurality of different parts to be heated, can be intensively and uniformly controlled in the heating process, can also be separately and independently controlled, has no higher harmonic interference and electromagnetic interference among the parts, and can not cause higher harmonic pollution to a power grid.
Claims (8)
1. A high-frequency induction heating apparatus characterized in that: the high-frequency induction heating power supply circuit is provided with a noise filter circuit, a three-phase bridge type uncontrolled rectifier circuit, a filter circuit, a chopping power-adjusting inverter circuit and a resonance circuit which are connected in sequence, the high-frequency induction heating power supply circuit is also provided with a rectification filter circuit and a control drive protection circuit which are connected in sequence, the noise filter circuit is provided with a three-phase power supply input end, the rectification filter circuit is provided with a two-phase power supply input end, the control output end of the control drive protection circuit is connected with the control input end of the chopping power-adjusting inverter circuit, a first current sensor is arranged between the noise filter circuit and the three-phase bridge type uncontrolled rectifier circuit, and a first voltage sensor is arranged between the filter circuit and the chopping power-adjusting inverter circuit, the output end of the resonance circuit is provided with a second current sensor and a second voltage sensor, the signal output ends of the first current sensor, the second current sensor, the first voltage sensor and the second voltage sensor are respectively connected with the input current detection end, the output current detection end, the input voltage detection end and the output voltage detection end of the control drive protection circuit, the output end of the remote rectification filter circuit is connected with a remote control circuit, and the remote control circuit is connected with the remote input and output device and each control drive protection circuit in a two-way communication manner.
2. The high-frequency induction heating apparatus according to claim 1, characterized in that: the control drive protection circuit comprises a control submodule, a drive submodule and a protection submodule, wherein the control submodule is the core of the control drive protection circuit, the control submodule receives measurement result signals from a first current sensor, a second current sensor, a first voltage sensor and a second voltage sensor and outputs protection control signals and drive control signals to the drive submodule and the protection submodule respectively, and the drive submodule outputs drive signals to the chopping power-regulating inverter circuit.
3. The high-frequency induction heating apparatus according to claim 2, characterized in that: the high-frequency induction heating power supply circuit further comprises a local input device and a local output device, the local input device and the local output device are both connected to the control drive protection circuit, the control words sent to the control drive protection circuit by the remote control circuit comprise remote/local control words, when the remote/local control words are 1, the control drive protection circuit controls the local input device to be in a forbidden state, and when the remote/local control words are 0, the control drive protection circuit controls the local input device to be in a permissible state.
4. The high-frequency induction heating apparatus according to claim 3, characterized in that: the high-frequency induction heating power circuit is further provided with a main loop power switch, the main loop power switch is located at the front end of the noise filter circuit, and the switch control output end of the protection submodule is connected with the control input end of the main loop power switch.
5. The high-frequency induction heating apparatus according to claim 4, characterized in that: each high-frequency induction heating power supply circuit is independently arranged in a metal shell, and the resonance circuit and the control drive protection circuit are respectively arranged in different cavities.
6. The high-frequency induction heating apparatus according to claim 4, characterized in that: and the power device in the chopping power-regulating inverter circuit adopts an IGBT module.
7. The high-frequency induction heating apparatus according to claim 4, characterized in that: and the power input end of the rectification filter circuit is directly connected to the power input end of the noise filter circuit to obtain power.
8. The high-frequency induction heating apparatus according to claim 1, 2, 3, 4, 5, 6 or 7, characterized in that: the noise filter circuit is provided with a plurality of parallel filter branches, each filter branch is controlled to be on or off by an electronic switch, the control input end of the electronic switch is connected with the control drive protection circuit, and the filter branches at least comprise three filter branches which are respectively used for eliminating third harmonic, fifth harmonic and seventh harmonic generated by the chopping power-regulating inverter circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010882754.XA CN112072902A (en) | 2020-08-28 | 2020-08-28 | High-frequency induction heating device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010882754.XA CN112072902A (en) | 2020-08-28 | 2020-08-28 | High-frequency induction heating device |
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| CN112072902A true CN112072902A (en) | 2020-12-11 |
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| CN202010882754.XA Pending CN112072902A (en) | 2020-08-28 | 2020-08-28 | High-frequency induction heating device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113251395A (en) * | 2021-01-28 | 2021-08-13 | 启研(沈阳)技术中心有限公司 | Steam generator's controlling means based on electromagnetic induction heating technique |
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Application publication date: 20201211 |
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| RJ01 | Rejection of invention patent application after publication |