Control method for starting electric flame furnace

Abstract

The invention discloses a control method for starting an electric flame furnace, which comprises a power supply conversion and control module, the power supply conversion module is powered by low-frequency alternating current mains supply, after starting, the low-frequency alternating current is firstly converted into direct current and then converted into high-frequency alternating current, and ignition is carried out after boosting, rectifying and voltage doubling; the control module is a single-chip microcomputer system, when direct current is converted into high frequency, the high frequency is controlled to change in a jumping mode through programming, and meanwhile a minimum air volume PWM signal and a PWM signal capable of enabling all the burners to be ignited instantly are output. After ignition, the single-chip microcomputer receives a control command, calculates and adjusts air volume and fire power PWM signals and further judges whether an end command is received or not, if yes, shutdown is carried out, and if not, waiting continues. According to the electric flame furnace, all furnace heads are ignited when the electric flame furnace is started, circuit protection is achieved, and the pot bottom is heated evenly.

Description

Technical Field

[0001] This invention relates to the field of electric flame furnace technology, and in particular to a control method for starting an electric flame furnace. Background Technology

[0002] Currently available electric flame furnaces work by first converting low-frequency AC to DC, then converting the DC to high-frequency AC, followed by voltage boosting and ignition via rectification and voltage multiplication. In their circuit structure, the high-frequency adjustment relies on a resistor knob. This adjustment method causes the circuit's resonant frequency to change continuously from startup to reaching maximum power—specifically, the resonant frequency gradually decreases. Due to this continuous resonant frequency variation, electric flame furnaces can only ignite individual burners one by one during the initial ignition phase, and cannot ignite all burners simultaneously.

[0003] This individual ignition method has two significant problems: First, during individual ignition, excessive current can easily be generated in a single ignition circuit. As the electric flame stove is used for a long time, the excessive current will greatly increase the probability of the ignition circuit burning out, which will lead to malfunctions and affect the normal use and lifespan of the electric flame stove. Second, when the electric flame stove is in low-power heating mode, because the burner heads are ignited one by one rather than simultaneously, the bottom of the pot will be heated unevenly, which cannot meet the user's need for uniform heating and affects the heating effect and user experience.

[0004] Based on the technical defects of existing electric flame furnaces, there is an urgent need for an electric flame furnace control solution that can solve the problems of easy circuit damage and uneven heating of the pot bottom caused by individual ignition. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide a control method for starting an electric flame furnace, which can ignite all the burners when the electric flame furnace is started, realize the protection circuit, and ensure uniform heating of the pot bottom, thereby overcoming the shortcomings of the prior art.

[0006] To solve the above-mentioned technical problems, the technical solution of the present invention is as follows:

[0007] A control method for starting an electric flame furnace includes a power conversion module and a control module. The power conversion module uses low-frequency AC mains power to provide power to the electric flame furnace. When the electric flame furnace is turned on, the low-frequency AC power is first converted into DC power, and then the DC power is converted into high-frequency AC power. After being boosted, rectified and multiplied, the DC power enters the ignition stage.

[0008] The control module is controlled by a microcontroller system. During the process of converting DC power to high-frequency AC power, the microcontroller system is programmed to control the high-frequency frequency, and the high-frequency frequency is controlled in a jump manner according to the set programming. On the one hand, the microcontroller system programs and controls the air volume of the burner nozzle and outputs the PWM signal corresponding to the minimum air volume. On the other hand, it programs and controls the ignition process and outputs the ignition PWM that can ensure that all burners are ignited instantly, so as to provide sufficient energy for instantaneous ignition.

[0009] After the electric flame furnace is ignited, it enters a state of waiting for control commands. When the microcontroller system receives an external control command, it adjusts the air volume PWM signal and the high-frequency firepower PWM signal output to the furnace head air volume control component through data calculation to achieve the expected functional effect.

[0010] The microcontroller system determines whether it has received an end command. If it has received an end command, the electric flame furnace stops operating. If it has not received an end command, it continues to wait for a control command.

[0011] The duty cycle of the PWM signal corresponding to the minimum air volume output by the microcontroller system is preset according to the number and model of the electric flame furnace head.

[0012] The amplitude and pulse width of the ignition PWM signal that ignites all the furnace heads instantly are preset through digital calculations by the microcontroller system to adapt to the ignition requirements of electric flame furnaces with different power specifications.

[0013] The adjusted ignition PWM signal has an output frequency that matches the resonant frequency of the electric flame furnace head, and its output power is maintained above the minimum power threshold that enables the furnace head to ignite stably.

[0014] During the control process, the microcontroller system collects the current and voltage signals of the electric flame furnace in real time, and dynamically corrects the output PWM signal based on the collected signals to avoid excessive current from a single ignition circuit.

[0015] The above technical solution has the following beneficial effects:

[0016] This invention employs microcontroller programming control to enable all burner heads to ignite synchronously when the electric flame furnace starts up. This avoids the problem of excessive current generated by a single ignition circuit in existing individual ignition methods, significantly reducing the probability of ignition circuit burnout, reducing equipment failures, extending the service life of the electric flame furnace, and improving operational stability. At the same time, synchronous operation of all burner heads can solve the problem of uneven heating of the pot bottom when heating at low power, improving heating effect and user experience. Attached Figure Description

[0017] To more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are merely exemplary, and those skilled in the art can derive other embodiments based on the provided drawings without creative effort.

[0018] The structures, proportions, sizes, etc. illustrated in this specification are only for the purpose of assisting those skilled in the art in understanding and reading the content disclosed herein, and are not intended to limit the conditions under which the present invention can be implemented. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in the proportions, or adjustments to the size, without affecting the effects and objectives that the present invention can produce, should still fall within the scope of the technical content disclosed in the present invention.

[0019] Figure 1 This is a schematic diagram of the working principle of electric flame furnaces currently on the market;

[0020] Figure 2 Working principle diagram of an electric flame furnace controlled by a microcontroller;

[0021] Figure 3 A flowchart illustrating the workflow of an electric flame furnace controlled by a microcontroller. Detailed Implementation

[0022] The specific embodiments of the present invention will be further described below with reference to the accompanying drawings. It should be noted that these descriptions are for the purpose of aiding understanding the present invention, but do not constitute a limitation thereof. Furthermore, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0023] See Figure 1 As shown, the electric flame furnaces currently on the market first convert the input low-frequency AC power into DC power, then convert the DC power into high-frequency AC power, boost the voltage of the converted high-frequency AC power, and then provide the necessary conditions for ignition through rectification and voltage multiplication.

[0024] This type of electric flame stove relies on a resistor knob to adjust the high-frequency circuit. From startup to reaching maximum power, the resonant frequency of the circuit changes continuously, specifically from high to low. Due to this continuous frequency change, the stove requires individual burner heads to be ignited one by one during the initial ignition process, rather than all burner heads igniting simultaneously. This method may generate excessive current in a single ignition circuit during individual ignition, which can easily burn out the ignition circuit over time, causing stove malfunctions. It also results in uneven heating of the pot bottom at low power.

[0025] See Figures 2-3 As shown, this invention discloses a control method for starting an electric flame furnace, including a power conversion module and a control module, characterized in that: the power conversion module can be found in [reference needed]. Figure 2 The electric flame furnace is powered by low-frequency AC mains electricity. When the electric flame furnace is turned on, the low-frequency AC power is first converted into DC power, and then the DC power is converted into high-frequency AC power. After being boosted, rectified and multiplied, it enters the ignition stage.

[0026] The control module is controlled by a microcontroller system. During the process of converting DC power to high-frequency AC power, the microcontroller system is programmed to control the high-frequency frequency, and the high-frequency frequency is controlled in a jump manner according to the set programming. On the one hand, the microcontroller system programs and controls the air volume of the burner nozzle and outputs the PWM signal corresponding to the minimum air volume. On the other hand, it programs and controls the ignition process and outputs the ignition PWM that can ensure that all burners are ignited instantly, so as to provide sufficient energy for instantaneous ignition.

[0027] After the electric flame furnace is ignited, it enters a state of waiting for control commands. When the microcontroller system receives an external control command, it adjusts the air volume PWM signal and the high-frequency firepower PWM signal output to the furnace head air volume control component through data calculation to achieve the expected functional effect.

[0028] The microcontroller system determines whether it has received an end command. If it has received an end command, the electric flame furnace stops operating. If it has not received an end command, it continues to wait for a control command.

[0029] The duty cycle of the PWM signal corresponding to the minimum air volume output by the microcontroller system is preset according to the number and model of the electric flame furnace head.

[0030] The amplitude and pulse width of the ignition PWM signal that ignites all the furnace heads instantly are preset through digital calculations by the microcontroller system to adapt to the ignition requirements of electric flame furnaces with different power specifications.

[0031] The adjusted ignition PWM signal has an output frequency that matches the resonant frequency of the electric flame furnace head, and its output power is maintained above the minimum power threshold that enables the furnace head to ignite stably.

[0032] During the control process, the microcontroller system collects the current and voltage signals of the electric flame furnace in real time, and dynamically corrects the output PWM signal based on the collected signals to avoid excessive current from a single ignition circuit.

[0033] The working process of this invention:

[0034] Step 1: When the electric flame furnace is started, the microcontroller system outputs a PWM signal corresponding to the minimum air volume to the nozzle air volume control unit. The duty cycle of this PWM signal is pre-determined to ensure that the air volume output by the nozzle can meet the ignition requirements while avoiding excessive air volume from affecting the ignition stability.

[0035] Step Two: The microcontroller system outputs an ignition PWM signal to the ignition unit. The amplitude and pulse width of this signal are preset through digital calculation, instantly providing sufficient energy to the ignition circuits of all burners. Combined with the rectifier voltage multiplier and boost unit, this achieves synchronous ignition of all burners. Simultaneously, the DC-to-high frequency unit, under the control of the microcontroller system, performs high-frequency jump control according to the programmed settings, rather than continuous changes, avoiding the problem of individual ignition caused by continuous adjustment of the resonant frequency.

[0036] Step 3: The microcontroller system adjusts the ignition PWM signal, adjusting its output frequency to match the resonant frequency of the burner head, and maintaining the output power above the minimum power threshold for stable ignition of the burner head, ensuring that all burners remain in an ignited state.

[0037] Step 4: The microcontroller system enters the waiting state for control commands, and receives control commands such as power adjustment and heating mode switching sent by the user through the operation panel in real time.

[0038] Step 5: After the microcontroller system receives the control command, it calculates the air volume programming parameters and firepower programming parameters by performing data calculations and combining the target parameters corresponding to the command with the current ignition status of the burner head. These parameters are then sent to the burner nozzle air volume control unit and the DC to high frequency unit, respectively, to achieve the expected functional effect.

[0039] Step Six: The microcontroller system determines whether it has received an end command. If it has received an end command, it controls each unit to stop working and the electric flame furnace to stop running. If it has not received an end command, it returns to Step Four and continues to wait for control commands.

[0040] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings, but the present invention is not limited to the described embodiments. For those skilled in the art, various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention, and these variations still fall within the protection scope of the present invention.

Claims

1. A control method for starting an electric flame furnace, comprising a power conversion module and a control module, characterized in that: The power conversion module uses low-frequency AC mains power to provide power to the electric flame furnace. When the electric flame furnace is turned on, it first converts the low-frequency AC power to DC power, and then converts the DC power to high-frequency AC power. After being boosted, rectified and multiplied, the DC power enters the ignition stage. The control module is controlled by a microcontroller system. During the process of converting DC power to high-frequency AC power, the microcontroller system is programmed to control the high-frequency frequency, and the high-frequency frequency is controlled in a jump manner according to the set programming. On the one hand, the microcontroller system programs and controls the air volume of the burner nozzle and outputs the PWM signal corresponding to the minimum air volume. On the other hand, it programs and controls the ignition process and outputs the ignition PWM that can ensure that all burners are ignited instantly, so as to provide sufficient energy for instantaneous ignition. After the electric flame furnace is ignited, it enters a state of waiting for control commands. When the microcontroller system receives an external control command, it adjusts the air volume PWM signal and the high-frequency firepower PWM signal output to the furnace head air volume control component through data calculation to achieve the expected functional effect. The microcontroller system determines whether it has received an end command. If it has received an end command, the electric flame furnace stops operating. If it has not received an end command, it continues to wait for a control command.

2. The control method for starting an electric flame furnace according to claim 1, characterized in that: The duty cycle of the PWM signal corresponding to the minimum air volume output by the microcontroller system is preset according to the number and model of the electric flame furnace head.

3. The control method for starting an electric flame furnace according to claim 1, characterized in that: The amplitude and pulse width of the ignition PWM signal that ignites all the furnace heads instantly are preset through digital calculations by the microcontroller system to adapt to the ignition requirements of electric flame furnaces with different power specifications.

4. The control method for starting an electric flame furnace according to claim 1, characterized in that: The adjusted ignition PWM signal has an output frequency that matches the resonant frequency of the electric flame furnace head, and its output power is maintained above the minimum power threshold that enables the furnace head to ignite stably.

5. The control method for starting an electric flame furnace according to claim 1, characterized in that: During the control process, the microcontroller system collects the current and voltage signals of the electric flame furnace in real time, and dynamically corrects the output PWM signal based on the collected signals to avoid excessive current from a single ignition circuit.

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