AC induction heating power supply
By configuring surge protectors, DC backup circuits, and inverter power regulation circuits in the AC induction heating power supply, combined with a DSP processor and water cooling system, the stability problem of traditional AC induction heating power supplies during grid fluctuations or power outages is solved, achieving efficient and stable crystal generation.
Patent Information
- Application Number
- CN202520158599.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-23
- Publication Date
- 2026-01-13
- Estimated Expiration
- 2035-01-23
AI Technical Summary
Traditional AC induction heating power supplies cannot operate continuously when the power grid fluctuates or is interrupted, resulting in crystal generation failure and large fluctuations in output power, which makes it difficult to meet the requirements of high-precision crystal growth processes.
The circuit employs an input power supply surge protector, adds a DC backup circuit, and ensures stable operation through an inverter power regulation circuit and a resonant heating circuit, combined with a DSP processor and a water cooling system. It also regulates the output frequency and power and provides a DC backup power supply to prevent interruptions.
It achieves stable circuit operation under power grid fluctuations or power outages, ensures uninterrupted crystal generation, improves heating efficiency and equipment stability, reduces power loss, and allows for flexible control in different heating stages.
Smart Images
Figure CN223798374U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to power supply equipment technical field, concretely relates to a AC induction heating power supply. BACKGROUND
[0002] The AC induction heating power supply is mainly applied to the temperature field control scene needing super high precision, such as silicon carbide, scintillation crystal, laser crystal and so on crystal growth.
[0003] The induction heating power supply is most efficient and fastest in heating metal materials, and is low in consumption and environmental protection.
[0004] The traditional induction heating power supply cannot meet the demand of high-precision crystal growth process due to the problems of large output power fluctuation, frequency and power cannot be adjusted and the like, in addition, when the power grid fluctuates or is powered off, the equipment cannot continuously operate, and the staff is not notified in time, resulting in the failure of crystal generation, and increasing the crystal generation cost and time consumption.
[0005] In view of the above problems, the AC induction heating power supply is provided. UTILITY MODEL CONTENTS
[0006] The utility model aims at providing an AC induction heating power supply, which is configured with a surge protector in an input power supply to ensure stable operation of the circuit, and a DC backup circuit is added to solve the problem of crystal generation failure in the background art when the power grid fluctuates or is powered off.
[0007] The technical scheme adopted by the utility model is as follows:
[0008] The utility model relates to an AC induction heating power supply, which comprises an input power supply, a rectifier filter circuit, a DC backup circuit, an inverter power regulation circuit and a resonant heating circuit,
[0009] The output end of the input power supply is connected with the input end of the rectifier filter circuit, the input power supply is equipped with a surge protector, the rectifier filter circuit converts input alternating current into direct current and carries out filtering, and then outputs smooth direct current;
[0010] The DC backup circuit is connected in parallel with the rectifier filter circuit, the output end of the DC backup circuit and the output end of the rectifier filter circuit are connected with the input end of the inverter power regulation circuit, the DC backup circuit comprises a DC backup power supply, an anti-reverse diode and an alarm, and the output end of the DC backup power supply is connected with the input end of the inverter power regulation circuit through the anti-reverse diode and the alarm;
[0011] The input end of the inverter power regulation circuit is connected with the output end of the direct current backup circuit and the output end of the rectification filtering circuit, the inverter power regulation circuit comprises a full-bridge inverter and a power regulation circuit, the direct current output by the rectification filtering circuit is converted into high-frequency alternating current through the full-bridge inverter; the output end of the power regulation circuit is connected with the input end of the full-bridge inverter, and the conduction state of the full-bridge inverter is controlled to adapt to the heating demand in different stages.
[0012] The output end of the inverter power regulation circuit is connected with the input end of the resonant heating circuit, the resonant heating circuit comprises a medium-frequency transformer and a resonant loop, the medium-frequency transformer is used for boosting and isolating the alternating current, the resonant loop comprises a capacitor and an induction coil, the capacitor and the induction coil form an LC resonant loop, the induction coil is driven, and the induction coil generates an alternating magnetic field under the action of current to convert electric energy into heat energy.
[0013] Further, the input power supply is a 380V three-phase alternating current power supply.
[0014] Further, the frequency output by the inverter power regulation circuit is 1kHz to 20kHz.
[0015] Further, the full-bridge inverter comprises four cascaded IGBT power switching elements, the power regulation circuit is a PWM control circuit, the conduction sequence and switching speed of the IGBT power switching elements are controlled through the PWM control circuit, so that the output frequency is adjusted, and the duty cycle of the full-bridge inverter is controlled through the PWM control circuit, so that the output power is adjusted.
[0016] Further, a DSP processor is further included, the output end of the DSP processor is connected with the input end of the power regulation circuit, the output end of the power regulation circuit is connected with the input end of the full-bridge inverter, and the DSP processor controls the output frequency and output power of the full-bridge inverter through the power regulation circuit.
[0017] Further, a water cooling system is further arranged beside the rectification filtering circuit and the inverter power regulation circuit, the water cooling system comprises a cooling water pipe, a heat sink and a temperature control device, the temperature control device comprises an embedded temperature sensor and a cooling water switch, the cooling water switch is installed on the cooling water pipe, and the embedded temperature sensor detects temperature, processes data and then controls the cooling water switch to control the circulation of cooling water.
[0018] Further, the induction coil is made of a copper pipe with high electrical conductivity and is plated with silver, and the induction coil is in a spiral shape.
[0019] As the technical scheme is adopted, the present application has the following beneficial effects:
[0020] This utility model is an AC induction heating power supply. It is equipped with a surge protector at the input power supply to prevent damage to the equipment caused by overvoltage due to lightning strikes, power grid fluctuations or switching operations, and to ensure the stable operation of subsequent circuits.
[0021] This invention relates to an AC induction heating power supply. Through a PWM control circuit, the conduction of four cascaded IGBT power switching elements is controlled, thereby adjusting the current frequency output by the inverter power regulation circuit and thus controlling the output power of the entire induction heating power supply. The output power can be flexibly adjusted according to different stages of crystal generation.
[0022] This invention is an AC induction heating power supply. It uses a high-frequency transformer to boost and electrically isolate the AC power, protecting the inverter power regulation circuit from load impact. Through an LC resonant circuit, a high-frequency oscillating current is generated, which produces an eddy current heating effect between the induction coil and the heated object, improving heating efficiency, reducing power loss, and making it more energy-efficient than traditional equipment.
[0023] This invention relates to an AC induction heating power supply, which is powered by a DC backup power supply to ensure the continuous operation of the resonant heating circuit and to ensure uninterrupted crystal growth. An alarm is installed on the DC backup power supply path to alert staff to power grid failures that require timely handling.
[0024] This utility model is an AC induction heating power supply. A water cooling system is also provided next to the rectifier filter circuit and the inverter power regulation circuit. The water cooling system effectively removes heat, ensuring stable operation of the equipment under high load conditions, and can further optimize the equipment life and operating efficiency. Attached Figure Description
[0025] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly described below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort. The proportional relationship of each component in the drawings of this specification does not represent the proportional relationship in the actual material selection and design, but is only a schematic diagram of the structure or position, wherein:
[0026] Figure 1 This is a structural block diagram of the heating power supply of this utility model. Detailed Implementation
[0027] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only for explaining the present utility model and are not intended to limit the present utility model; that is, the described embodiments are only some embodiments of the present utility model, and not all embodiments. The components of the embodiments of the present utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.
[0028] It should be noted that the terms “comprising,” “including,” or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.
[0029] All features disclosed in this specification, or all steps in all disclosed methods or processes, may be combined in any way, except for mutually exclusive features and / or steps.
[0030] The present invention will now be described in detail with reference to the accompanying drawings. This embodiment only illustrates the specific implementation of a project's safety management process.
[0031] Example 1
[0032] This utility model is an AC induction heating power supply, such as Figure 1 As shown, it includes an input power supply, a rectifier and filter circuit, a DC backup circuit, an inverter power regulation circuit, and a resonant heating circuit.
[0033] The output terminal of the input power supply is connected to the input terminal of the rectifier and filter circuit. The input power supply is equipped with a surge protector. The rectifier and filter circuit converts the input AC power into DC power and filters it to output smooth DC power.
[0034] The DC backup circuit is connected in parallel with the rectifier and filter circuit. The output terminals of the DC backup circuit and the rectifier and filter circuit are both connected to the input terminal of the inverter power regulation circuit. The DC backup circuit includes a DC backup power supply, a reverse protection diode, and an alarm. The output terminal of the DC backup power supply is connected to the input terminal of the inverter power regulation circuit through the reverse protection diode and the alarm.
[0035] The input terminal of the inverter power regulation circuit is connected to the output terminal of the DC backup circuit and the output terminal of the rectifier filter circuit. The inverter power regulation circuit includes a full-bridge inverter and a power regulation circuit. The DC power output by the rectifier filter circuit is converted into high-frequency AC power by the full-bridge inverter. The output terminal of the power regulation circuit is connected to the input terminal of the full-bridge inverter to control the conduction state of the full-bridge inverter and adapt to the heating requirements at different stages.
[0036] The output terminal of the inverter power regulation circuit is connected to the input terminal of the resonant heating circuit. The resonant heating circuit includes an intermediate frequency transformer and a resonant circuit. The intermediate frequency transformer boosts and isolates the AC power. The resonant circuit includes a capacitor and an induction coil. The capacitor and the induction coil form an LC resonant circuit, which drives the induction coil. The induction coil generates an alternating magnetic field under the action of the current, converting electrical energy into heat energy.
[0037] Preferably, the input power supply is a 380V three-phase AC power supply.
[0038] Preferably, the frequency output by the inverter power regulation circuit is 1kHz to 20kHz.
[0039] Preferably, the full-bridge inverter includes four cascaded IGBT power switching elements, and the power regulation circuit is a PWM control circuit. The PWM control circuit controls the conduction sequence and switching speed of the IGBT power switching elements to adjust the output frequency. The PWM control circuit also controls the duty cycle of the full-bridge inverter to adjust the output power.
[0040] Preferably, it also includes a DSP processor, the output of which is connected to the input of a power regulation circuit, and the output of the power regulation circuit is connected to the input of a full-bridge inverter. The DSP processor controls the output frequency and output power of the full-bridge inverter through the power regulation circuit.
[0041] Preferably, the induction coil is made of a copper tube with high conductivity and silver plating on the surface, and the induction coil is spiral-shaped.
[0042] In this embodiment, the input power supply is a 380V three-phase AC power supply equipped with a surge protector. The surge protector is used to prevent damage to the equipment caused by overvoltage due to lightning strikes, power grid fluctuations, or switching operations, ensuring the stable operation of subsequent circuits. The surge protector in this embodiment includes a varistor (MOV, Metal Oxide Varistor), a gas discharge tube (GDT, Gas Discharge Tube), and a TVS diode (Transient Voltage Suppressor Diode). The varistor, gas discharge tube, and TVS diode are connected in parallel between each input wire and the ground wire (PE) to provide graded protection against surge voltage and discharge overvoltage to ground, thereby protecting the safety of the equipment and circuits. Specifically, the varistor: when the input voltage exceeds the breakdown voltage of the varistor, the varistor will rapidly reduce its impedance, dissipating the overvoltage energy to ground and protecting subsequent circuits; the gas discharge tube: under higher energy surge conditions, the gas discharge tube will conduct, rapidly shunting the overvoltage to ground; the TVS diode: with fast response speed, it can instantaneously suppress voltage spikes, providing protection for sensitive electronic equipment. The breakdown voltage of the surge protector in this embodiment is 430V~470V, and the response time is less than 25ns.
[0043] A 380V three-phase AC power supply is connected to a rectifier and filter circuit via wires. A full-bridge rectifier circuit converts the 380V three-phase AC power supply to DC power, which is then filtered by an LC filter circuit to reduce output ripple and improve stability. The stable DC power output from the rectifier and filter circuit is input to a full-bridge inverter composed of four cascaded IGBT (Insulated Gate Bipolar Transistor) power switching elements, which converts the DC power to high-frequency AC power. The DSP processor, by acquiring crystal growth data or according to a pre-set program, controls the conduction of the four cascaded IGBT power switching elements via a PWM (Pulse Width Modulation) control circuit, thereby adjusting the output frequency and output power of the inverter power regulation circuit. Specifically: adjusting the duty cycle of the PWM control circuit signal controls the conduction time of the IGBT power switching elements, adjusts the output voltage amplitude, and thus adjusts the output power to adapt to the different heat requirements of the device at different heating stages; adjusting the frequency of the PWM control circuit signal controls the conduction sequence and switching speed of the IGBT power switching elements, and adjusts the output frequency. In this embodiment, the frequency range of the inverter power regulation circuit output is 1kHz to 20kHz, suitable for devices with different heating depth requirements.
[0044] In this embodiment, the current output from the inverter power regulation circuit is boosted and electrically isolated by a high-frequency transformer. Through an LC resonant circuit, a high-frequency oscillating current is generated, inducing an eddy current heating effect between the induction coil and the heated object. This improves heating efficiency, reduces power loss, and is more energy-efficient than traditional equipment. The induction coil in this embodiment is made of a high-conductivity copper tube, silver-plated, and spiral-shaped, which reduces resistance and eddy current losses, making it more suitable for localized heating during crystal growth.
[0045] This embodiment also includes a DC backup circuit, which comprises a DC backup power supply, a reverse protection diode, and an alarm. When the power grid fails and power is lost, the reverse protection diode conducts, and the DC backup power supply provides power to ensure the continuous operation of the resonant heating circuit and the uninterrupted growth of the crystal. However, the power of the DC backup power supply cannot be used for a long time. Therefore, an alarm is installed in the path of the DC backup power supply. When the DC backup power supply is turned on, the alarm will sound to alert the staff that there is a power grid failure and that it needs to be dealt with in a timely manner.
[0046] Example 2
[0047] This embodiment is a further explanation of the present invention.
[0048] This embodiment is based on Embodiment 1, such as... Figure 1 As shown, a water cooling system is also provided next to the rectifier filter circuit and the inverter power regulation circuit. The water cooling system includes cooling water pipes, heat sinks and a temperature control device. The temperature control device includes an embedded temperature sensor and a cooling water switch. The cooling water switch is installed on the cooling water pipe. The embedded temperature sensor detects the temperature and processes the data to control the cooling water switch to control the flow of cooling water.
[0049] In this embodiment, the embedded temperature sensor possesses lightweight data processing capabilities. It collects the temperature of the rectifier filter circuit and the inverter power regulation circuit, as well as the components therein. After processing the collected temperature data, it controls the opening and closing of the cooling water switch. If the collected temperature does not reach a preset threshold, heat dissipation is achieved solely through the heat sink. If the collected temperature reaches the preset threshold, the cooling water switch is turned on to achieve rapid heat dissipation and cooling. The water cooling system effectively removes heat, ensuring stable operation of the equipment under high load conditions and further optimizing equipment lifespan and operating efficiency.
[0050] The above description is merely a preferred embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be conceived by those skilled in the art within the technical scope disclosed in this utility model without creative effort should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the scope defined in the claims.
Claims
1. An AC induction heating power supply, characterized by: The input power supply, rectification filter circuit, DC backup circuit, inverter power regulation circuit and resonant heating circuit are connected in series. The output end of the input power supply is connected with the input end of the rectification filter circuit. The DC backup circuit and the rectification filter circuit are connected in parallel. The output end of the DC backup circuit and the output end of the rectification filter circuit are connected with the input end of the inverter power regulation circuit. The input end of the inverter power regulation circuit is connected with the output end of the DC backup circuit and the output end of the rectification filter circuit.
2. An AC induction heating power supply according to claim 1, characterized in that: The output end of the inverter power regulation circuit is connected with the input end of the resonant heating circuit.
3. An AC induction heating power supply as defined in claim 1, wherein: The input power supply is a 380V three-phase alternating current power supply.
4. An AC induction heating power supply as defined in claim 1, wherein: The frequency of the inverter power regulation circuit is 1kHz to 20kHz.
5. An AC induction heating power supply as defined in claim 4, wherein: The full-bridge inverter includes four cascaded IGBT power switch elements.
6. An AC induction heating power supply as defined in claim 1, wherein: The power regulation circuit is a PWM control circuit.
7. An AC induction heating power supply as defined in claim 1, wherein: The DSP processor is connected with the input end of the power regulation circuit. The water cooling system includes a cooling water pipe, a heat sink and a temperature control device. The inductive coil is made of a high-conductivity copper pipe plated with silver. The inductive coil is in a spiral shape.