CN201323669Y - Control device of continuous heating during low power period of electromagnetic oven - Google Patents

Control device of continuous heating during low power period of electromagnetic oven Download PDF

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Publication number
CN201323669Y
CN201323669Y CNU2008202043143U CN200820204314U CN201323669Y CN 201323669 Y CN201323669 Y CN 201323669Y CN U2008202043143 U CNU2008202043143 U CN U2008202043143U CN 200820204314 U CN200820204314 U CN 200820204314U CN 201323669 Y CN201323669 Y CN 201323669Y
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China
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circuit
connected
power
end
output terminal
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CNU2008202043143U
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Chinese (zh)
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军 汪
金洪波
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佛山市顺德区瑞德电子实业有限公司
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    • HELECTRICITY
    • H05ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05BELECTRIC HEATING; ELECTRIC LIGHTING NOT OTHERWISE PROVIDED FOR
    • H05B6/00Heating by electric, magnetic, or electromagnetic fields
    • H05B6/02Induction heating
    • H05B6/06Control, e.g. of temperature, of power
    • HELECTRICITY
    • H05ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05BELECTRIC HEATING; ELECTRIC LIGHTING NOT OTHERWISE PROVIDED FOR
    • H05B6/00Heating by electric, magnetic, or electromagnetic fields
    • H05B6/02Induction heating
    • H05B6/10Induction heating apparatus, other than furnaces, for specific applications
    • H05B6/12Cooking devices
    • H05B6/129Cooking devices induction ovens

Abstract

The utility model discloses a control device of continuous heating during low power period of an electromagnetic oven, comprising a power supply circuit (1), a central processing unit (2), a discharging circuit (3), a control circuit (4), a resonance circuit (5), a commercial power zero passage detecting circuit (6) and a power tube (IGBT); wherein the power supply circuit (1) respectively supplies power to the central processing unit (2), the discharging circuit (3), the control circuit (4), the resonance circuit (5), the commercial power zero passage detecting circuit (6) and the power tube (IGBT); a signal output terminal of the commercial power zero passage detecting circuit (6) is connected to the input terminal of the central processing unit (2), and the output terminal of the central processing unit (2) is respectively connected to input terminals of the discharging circuit (3) and the control circuit (4), and the output terminal of the control circuit (4) is connected to the input terminal of the resonance circuit (5), and the output terminal of the resonance circuit (5) is connected to the power tube (IGBT). The utility model not only solves the problem of low power continuous heating, but also reduces the cost and enhances cost performance of the product.

Description

一种电磁炉低功率段连续加热控制装置 One kind of low power section continuous heating cooker control means

技术领域 FIELD

本实用新型是一种电磁炉低功率段连续加热控制装置,属于电磁炉低功率段连续加热控制装置的改造技术。 The present invention is a low power section continuous heating cooker control means belonging to the transformation technology continuous heating cooker low power section of the control device. 背景技术 Background technique

电磁炉作为一种新兴时尚的厨具产品,以其无明火烹饪、环保、 多功能性、操作简单等优点,曰益受到广大消费者青睐。 Induction as a new stylish kitchen products, with no open flame cooking, environmental protection, versatility, simple operation, said Yi by the majority of consumers. 目前巿面上 Currently market faces

普通家用电磁炉的功率一般在2200W以下,对于火锅、炒菜等这类以大功率需求为主的功能都能很稳定可靠地实现,但对于煲汤、煮粥、 Common household cooker 2200W power is generally less for hot pot, stir-fries and other such high power demand-driven functions can be implemented very stable and reliable, but for soup, porridge,

慢炖等这类以低功率需求为主的功能而言,大多还是靠间歇加热的方式来实现的,这对食物烹饪效果及营养方面都大打折扣。 Simmer and other such low power requirements in terms of function-based, most of them or by way of intermittent heating to achieve, which is to cook food and nutrition effects are greatly reduced. 这主要归结于普通单管(即1个功率管IGBT的)电磁炉按正常电源电压工作在小功率连续档位时功率管IGBT无法做到零电压开关,故而开关损耗非常大,发热严重,不能正常可靠地工作。 This is mainly due to the single common tube (i.e., a power transistor of the IGBT) cooker operates in a normal power supply voltage in a small range of continuous power transistor IGBT to achieve zero-voltage switching can not, therefore very large switching loss, severe heat, can not normally work reliably.

虽然,也有电控板厂家对此低功率连续加热难题作出了技术上的突破,但主要都还是通过继电器控制半波整流或可控硅斩波等降低谐振回路的输入电压的方法来实现的,其增加的成本较高,使得产品在性价比方面竟争力受影响。 Although manufacturers of electronic control board also has a low power continuous heating this problem has made a technical breakthrough, but are still the main method by the relay the input voltage of the resonant circuit to achieve reduction control thyristor chopper half-wave rectification or the like, the higher its increased costs, making products competitive affected in the cost.

实用新型内容 SUMMARY

本实用新型的目的在于考虑上述问题而提供一种既解决了低功率连续加热的难题,又尽可能降低了成本,增加了产品的性价比的电磁炉低功率段连续加热控制装置。 The present invention aims to provide a view of the above problems, not only solves the problem of low power continuous heating, but also minimize the cost and increase the cost of the product low power section continuous heating cooker control means.

本实用新型的技术方案是:包括有电源电路、中央处理单元, 放电电路、控制电路、谐振电路、巿电过零检测电路及功率管,其中电源电路分别给中央处理单元,放电电路、控制电路、谐振电路、巿电过零检测电路及功率管供电,巿电过零检测电路的信号输出端与中央处理单元的输入端连接,中央处理单元的输出端分别与放电电路及控制电路的输入端连接,控制电路的输出端与谐振电路的输入端连接,谐振电路的输出端与功率管连接。 The present invention technical solution: a power circuit, a central processing unit, a discharge circuit, control circuit, resonance circuit, market electric zero-crossing detection circuit and the power tube, wherein the power supply circuit, respectively, to a central processing unit, a discharge circuit, control circuit resonance circuit, market electric zero-crossing detection circuit and power tube supply, market electric zero-crossing detection circuit, a signal output terminal and the input terminal of a central processing unit connected to the central processing output of the unit are the discharge circuit and a control circuit input terminal connecting the input terminal and the output terminal of the resonant circuit, a control circuit connected to the output terminal of the resonant circuit is connected to the power tube. 上述中央处理单元为单片机。 Said central processing unit is a microcontroller.

上述巿电过零检测电路包括有电阻R1,R2,RJ1,三极管Ql,其 Above zero-crossing detection circuit electrically market comprises a resistor R1, R2, RJ1, transistor Ql, which

中三极管Ql的发射极接地,三极管Ql的基极分别与电阻RJ1的一端 In the emitter-grounded transistor Ql, the base of transistor Ql each end of the resistor RJ1

及电阻R1的一端连接,电阻RJ1的另一端接地,电阻R1的另一端通 And one end of the resistor R1, the other end of the resistor RJ1, and the other end of the resistor R1 through

过二极管D3与电源电路连接及与二极管Dl、 D2连接,二极管Dl、 Through the diode D3 is connected to the supply circuit and the diode Dl, D2 is connected, a diode Dl,

D2的输入端与巿电连接,输出端与整流桥DB1连接,三极管Q1的集 D2 input terminal is electrically connected to the market, the output terminal of the rectifier bridge DB1 is connected to the collector of transistor Q1

电极通过电阻R2与电源连接。 Electrode connected to the power supply through resistor R2.

上述放电电路包括有电阻R3,R6,R7,三极管Q2,其中三极管Q2 The discharge circuit comprises a resistor R3, R6, R7, transistor Q2, transistor Q2 wherein

的发射极接地,三极管Q2的集电极通过电阻R3与扼流圈Ll及电容Cl的一端连接,电容C1的另一端接地及与整流桥DB1的输出端连接, 扼流圈Ll的另一端与整流桥DB1的输出端连接,三极管Q2的基极分别与电阻R6,R7连接,电阻R6的另一端接地,电阻R7的另一端与中央处理单元连接。 An emitter grounded, the collector of transistor Q2 through a resistor R3 to one end of a choke coil Ll and a capacitor Cl is connected to the output terminal of the other end of the capacitor C1 and the rectifier bridge DB1 is connected to the other end of the choke coil Ll and rectifying bridge DB1 is connected to the output terminal, the base of transistor Q2, respectively, and resistors R6, R7, and the other end of the resistor R6, and the other end of the resistor R7 is connected with the central processing unit.

上述包括有谐振电路包括有电容C2和电感L2,电容C2与电感L2 组成的并联电路的一端分别与电阻R3、扼流圈L1及电容C1连接,电 Comprising the above-described resonant circuit comprises inductor L2 and a capacitor C2, one end of the parallel circuit composed of inductor L2 and capacitor C2 are respectively and resistor R3, a choke coil L1 and a capacitor C1 is connected electrically

5容C2与电感L2组成的并联电路的另一端与功率管连接,且电容C2 与电感L2组成的并联电路的两端分别通过电阻R4、R5将谐振电路(5) Both ends of the parallel circuit connected to the other end of the power transistor 5 and the capacitor C2 parallel circuit consisting of inductor L2 and capacitor C2 and inductor L2 respectively composed of resistors R4, R5 to the resonant circuit (5)

的同步信号引入控制电路。 Synchronous signal into the control circuit.

上述功率管的基极与发射极之间还并接有电阻R8及稳压二极管ZD1。 And also connected with the zener diode ZD1 and a resistor R8 between the base electrode and the emitter of the power transistor.

本实用新型与现有技术相比,具有如下突出的优点: Present invention compared with the prior art, has the following outstanding advantages:

1) 本实用新型使电磁炉整机的大小功率段切换完全由软件控制, 1) the size of the power section switch so that the appliance of the present invention the machine is completely controlled by software,

当需输出大功率时,放电电路不工作,其他所有电路的工作方式及参数完全与传统电路一致,即不会增加额外的能量损耗(热功耗),保 When the desired output power, the discharge circuit does not work, work, and all other parameters identical with the circuit of the conventional circuit, i.e. no extra energy loss (heat consumption), Paul

留了传统方案在大功率段的优点;当需要输出低功率时,由单片机软 Leaving the advantages of traditional power program segment; low power output when needed, by the microcontroller soft

件控制,将传统的周期为秒级的间歇工作方式改为周期为亳秒级的间歇工作,同时单片机输出放电信号控制放电电路的工作,且间歇的起止动作与输入巿电的过零及放电电路的工作同步,即谐振电路的启动 The control member, the traditional period of the order of seconds to intermittent duty cycle of intermittent operation Bo second stage, while the start-stop operation of the microcontroller outputs a control signal discharging the discharge operation of the circuit, and intermittently with the zero crossing of the input power market and a discharge synchronous operation of the circuit, i.e. to start the resonant circuit

和停止都发生在市电过零点附近。 And stopping power had occurred in the city near zero.

2) 本实用新型使电磁炉整机工作在小功率段时,谐振电路的瞬时电参数可保持跟大功率连续工作时相同,即IGBT的工作能满足零电压导通条件,从而保证发热量小,工作稳定可靠。 2) of the present invention to make the machine work in a small cooker power section, instantaneous electrical parameters of the resonant circuit may remain the same for continuous operation with high power, i.e. IGBT operation to meet the zero voltage conditions, thus ensuring a small amount of heat, stable and reliable.

3) 本实用新型由于其控制方法本质上还是亳秒级周期的间歇工作,故IGBT本身的平均热损耗很小。 3) Since the present invention is essentially a method for controlling the intermittent operation Bo-second period, the average thermal IGBT itself is so small loss.

4) 本实用新型使电磁炉整机输出功率大小可以由单片机软件改变该间歇工作的通断比来控制,也可以由单片机软件改变输出给控制电路的PWM信号大小来控制,功率调整非常灵活5)本实用新型与传统的控制方案相比,由于只增加了过零检测电路和放电电路,而组成这些电路的器件是极为普通的价格低廉的器件,故本实用新型具有很好的价格优势。 4) so ​​that the appliance of the present invention may vary the size of the whole power output of the intermittent operation of the software by the microcontroller to control the on-off ratio may be changed by the microcontroller software to output the PWM signal to control the size of the control circuit, the power adjustment is very flexible 5) the present invention as compared with the conventional control scheme, since an increase of only zero-crossing detection circuit and a discharge circuit, which consists of devices of these circuits are very common inexpensive device, so the present invention has a good price advantage.

本实用新型是一种设计巧妙,性能优良,方便实用的温控压力煲的控制装置。 The present invention is an ingenious design, excellent performance, convenient and practical means of controlling the temperature control of the pressure cooker.

附图说明 BRIEF DESCRIPTION

图i为本实用新型的原理框图; 图2为本实用新型的电路原理图; FIG schematic block diagram of the present i new utility; FIG. 2 is a schematic circuit diagram invention;

图3是市电经全波整流后的波形和过零信号的波形示意图; 图4是电磁炉在大功率段连续工作时IGBT反压端(即其源极 FIG 3 is a schematic view through the mains waveforms and zero-crossing signals after full-wave rectification; FIG. 4 is an IGBT when the counter-pressure end of the appliance in continuous operation power section (i.e., its source

与谐振电感L2相连的节点端)波形包络线(图中的上半部分)和在 End node and the resonant inductor L2 is connected to) an envelope waveform (upper half portion in the figure) and in

低功率段工作时波形包络线(图中的下半部分)的对比示意图。 Comparative envelope waveform diagram of the low power work section (lower half of the figure) of.

具体实施方式 Detailed ways

实施例 Example

本实用新型的原理框图如图1所示,包括有电源电路l、中央处理单元2,放电电路3、控制电路4、谐振电路5、巿电过零检测电路6及功率管IGBT,其中电源电路1分别给中央处理单元2,放电电路3、控制电路4、谐振电路5、巿电过零检测电路6及功率管IGBT供电,市电过零检测电路6的信号输出端与中央处理单元2的输入端连接,中央处理单元2的输出端分别与放电电路3及控制电路4的输入端连接,控制电路4的输出端与谐振电路5的输入端连接,谐振电路5的输出端与功率管IGBT连接。 Block diagram of the present invention shown in Figure 1, comprises a power supply circuit L, the central processing unit 2, the discharge circuit 3, a control circuit 4, the resonance circuit 5, the zero-crossing detection circuit electrically market 6 and the IGBT power transistor, wherein a power supply circuit 1, respectively, to the central processing unit 2, the discharge circuit 3, a control circuit 4, the resonance circuit 5, market electric zero-crossing detection circuit 6 and the Transistor (IGBT) power, city signal output terminal electrically zero-crossing detection circuit 6 to the central processing unit 2 input terminal, the output terminal of the central processing unit 2 are connected to the input terminal of the discharge circuit 3 and the control circuit 4, the control circuit input output terminal of the resonant circuit 5 4 is connected to the output terminal of the resonant circuit 5 and the power transistor IGBT connection. 本实施例中,中央处理单元2为单片机。 In this embodiment, the central processing unit 2 for the microcontroller.

本实用新型的电路原理图如图2所示,上述巿电过零检测电路6包括有电阻R1,R2,RJ1,三极管Ql,其中三极管Ql的发射极接地, 三极管Ql的基极分别与电阻RJ1的一端及电阻R1的一端连接,电阻RJ1的另一端接地,电阻Rl的另一端通过二极管D3与电源电路1连接及与二极管D1、 D2连接,二极管D1、 D2的输入端与市电连接,输 The present invention circuit diagram in FIG. 2, the zero-crossing detection circuit electrically market 6 comprises a resistor R1, R2, RJ1, transistor Ql, wherein the emitter of transistor Ql is grounded, the transistor Ql base resistor respectively RJ1 and one ends of the resistor R1, and the other end of the resistor RJ1, and the other end of the resistor Rl 1 is connected and the diodes D1, D2 is connected via a diode D3 and a power supply circuit, an input terminal of the diode D1, D2 connected to the mains, the input

出端与整流桥DB1连接,三极管Ql的集电极通过电阻R2与电源连接。 The end of the rectifier bridge DB1 is connected to the collector of transistor Ql is connected through a resistor R2 to the power supply. 上述放电电路3包括有电阻R3,R6,R7,三极管Q2,其中三极管 The discharge circuit 3 includes a resistor R3, R6, R7, transistor Q2, wherein the transistor

Q2的发射极接地,三极管Q2的集电极通过电阻R3与扼流圈Ll及电 Q2 is grounded emitter, the collector of transistor Q2 through a resistor R3 and a choke coil Ll and electrical

容C1的一端连接,电容C1的另一端接地及与整流桥DB1的输出端连 One end of the capacitor C1 is connected to the output terminal of the other end of the capacitor C1 and the rectifier bridge DB1 is connected

接,扼流圈Ll的另一端与整流桥DB1的输出端连接,三极管Q2的基 Then, the other end of the choke coil Ll and the output terminal of the rectifier bridge DB1 is connected to the base of transistor Q2

极分别与电阻R6,R7连接,电阻R6的另一端接地,电阻R7的另一端 Electrode respectively resistors R6, R7, and the other end of the other end of the resistor R6, the resistor R7

与中央处理单元2连接。 2 connected to the central processing unit.

上述包括有谐振电路5包括有电容C2和电感L2,电容C2与电感L2组成的并联电路的一端分别与电阻R3、扼流圈Ll及电容Cl连接, 电容C2与电感L2组成的并联电路的另一端与功率管IGBT连接,且电容C2与电感L2组成的并联电路的两端分别通过电阻R4、 R5将谐振电路5的同步信号引入控制电路4。 5 includes the above-described resonance circuit comprising a capacitor C2 and inductor L2, one end of the parallel circuit composed of the capacitor C2 and the inductor L2 are connected to the resistor R3, a choke coil Ll and capacitor Cl, capacitor C2 is a parallel circuit composed of inductor L2 and the other One end is connected IGBT power tube, and both ends of the parallel circuit of inductor L2 and capacitor C2 respectively composed of resistors R4, R5 to the resonance circuit 5 synchronous signal into the control circuit 4.

上述功率管IGBT的基极与发射极之间还并接有电阻R8及稳压二极管ZD1。 And also connected with the zener diode ZD1 and a resistor R8 between the base of the IGBT power transistor and the emitter.

上述电源电路1及控制电路4可釆用现有的电路。 The power supply circuit 1 and the control circuit 4 may preclude the use of conventional circuits. 图3是巿电经全波整流后的波形和过零信号的波形示意图,过零信号的波形为一标准的方波,其高电平的宽度主要由输入电压的大小及过零电路的参数决定。 FIG 3 is a market through an electrical circuit schematic of argument zero zero signal waveform and over, the zero-crossing signal waveform is a square wave standard, which mainly consists of a high level width and the magnitude of the input voltage waveform of the full-wave rectified decision. 单片机通过检测该高电平的宽度决定放电信号持续的最长时间,只有在过零信号为高电平状态时单片机才输出放电信号。 Microcontroller determines maximum duration of the discharge signal, only the zero crossing signal is at high level state until the microcontroller outputs a discharge signal detected by the width of the high level. 图4是电磁炉在大功率段连续工作时IGBT反压端(即其源 FIG 4 is a side IGBT backpressure in continuous operation when the appliance power section (i.e., the source

极与谐振电感L2相连的节点端)波形包络线(图中的上半部分)和 Node side electrode and the resonant inductor L2 is connected to) an envelope waveform (upper half portion in the figure) and

在低功率段工作时波形包络线(图中的下半部分)的对比示意图。 In contrast schematic waveform envelope of a low-power working section (lower half of the figure) of.

本实用新型将传统的间歇加热的控制思想进行延伸,把P丽控制方法直接应用于谐振电路路:间断周期由几秒到几十秒之间缩短至几亳秒到几十亳秒之间,即将间断频率扩大为原有的几百倍。 Thought the present invention controls the conventional intermittent heating by stretching, the control method applied directly to P Li resonance circuit path: discontinuous cycle from several seconds to several tens of seconds between Bo between several seconds to several tens seconds Bo, is about to expand to the original intermittent frequency hundreds of times. 这样,在l秒之内谐振回路的工作间歇几次到几十次,在锅具上获得的能量(热能)也是按此频率重复,而由于热量和温度这类模拟量的变化迟缓特点,其热量和温度仍然是均匀地变化且与该通断比对应,故而通过软件调整该通断比来调节输出功率。 Thus, in the second work l resonant circuit intermittently several times to dozens of times, the energy (heat) obtained on cookware repetition frequency is Click, due to changes in the characteristics of such analog delay heat and temperature, which heat and temperature is still uniformly and changes the on-off ratio corresponding to the on-off ratio and therefore to adjust the output power is adjusted by software. 在上述电路中,C2和电感L2构成能量转换的谐振电路;放电电路受单片机输出的放电信号来对Cl进行放电。 In the above circuit, C2 and the inductor L2 constitute a resonance circuit for energy conversion; discharge signal by discharging circuit microcontroller output to discharge the Cl. 电阻R4,R5将谐振电路的同步信号引入控制电路,单片机输出PWM信号给控制电路来调整IGBT的导通时间;通过启动控制信号来控制整个控制电路及谐振电路的起动和停止。 Resistors R4, R5 synchronizing signal control circuit incorporated resonant circuit, the microcontroller outputs a PWM signal to the control circuit to adjust the conduction time of the IGBT; by activating a control signal to control the start and stop the entire control circuit and the resonance circuit.

本实用新型实施的关键点在于: Embodiment of the present invention, the key point is:

1、由单片机输出的启动控制信号给到控制电路4,使谐振电路5 按一个较高的频率不断的启动后停止,从而产生亳秒级周期的间歇工作。 1, the start control signal to the microcontroller output to the control circuit 4, the resonant circuit 5 according to a high frequency constant start stopped, resulting in the intermittent operation Bo-second period. 由单片机内部的控制软件控制的启动信号必须满足:通断周期为巿电周期半数的整数倍,按220VAC/50Hz的巿电计算即为10亳秒的整数倍,且与巿电过零点同步。 The activation signal control software in a microcomputer must be met: off period is an integer multiple of half of the electrical cycle market, the calculated electricity market 220VAC / 50Hz is the integral multiple of 10 seconds Bo, the market and the zero-crossing synchronized electrically. 这是因为巿电在过零点时,整流桥DB1处于截至状态,电容C1和电感L1中储存的能量较小,此时启动 This is because the electric market at the zero crossing, the rectifier bridge DB1 in the off state, inductor L1 capacitor C1 and the stored energy is small, the startup

或停止谐振回路对锅具产生的电磁应力较小,锅具产生的噪音较小。 Electromagnetic stress or to stop the resonant circuit to generate a small pot, pots and pans produced less noise. 2、在每一个间歇周期启动前,须通过放电电路3将C1上的电荷释放,使其电压降到过零电压以下,然后再通过启动控制信号启动新一轮的谐振工作。 2, before the start of each intermittent period, the charge on the subject 3 by the discharge circuit C1 is released, so that the voltage zero crossing of the voltage drops, and then start a new round of resonance operation by the start control signal. 这样做的原因同样是为了降低锅具在每个周期启动 The reason for this is also to reduce the pans start of each cycle

时受到的电磁力大小,从而进一步将噪音降到最低。 When subjected to electromagnetic force size, thereby further noise to a minimum. 具体步骤为:巿 Specific steps: Coverage

电过零信号的上升沿触发单片机的外部中断,其立即输出放电信号开 Rising external electric zero-crossing signal triggers the microcontroller interrupt its output immediately to open the discharge signal

始对C1进行放电,同时开始计时,单片机的控制程序通过判断电压 C1 starts to discharge, at the same time start time, the microcontroller determines voltage control program

AD的大小,根据软件算法得出最优放电时间(设为t),当放电时间 AD size, the optimal discharge time is obtained in accordance with software algorithms (set t), when the discharge time

达到t时或者过零信号的下降沿到达时,单片机立即撤销放电信号, When t reaches or reach through the edge of the zero signal, the microcontroller immediately revoke the discharge signal,

然后输出启动信号来启动谐振回路工作。 Then output start signal to start the resonant circuit work.

以图4的占空比为例,按220VAC/50Hz巿电输入,电路的工作状态和主要参数为: FIG 4 is an example duty cycle, according to 220VAC / 50Hz electrical input market, the working state of the circuit and the main parameters are:

(—t/R3*Cl) (-T / R3 * Cl)

放电时间为t时刻,电容C1上的电压为:Ue = 311*e , Discharge time t, the voltage on the capacitor C1 is: Ue = 311 * e,

实际参数取R3为900/4W的水泥电阻,Cl为4uF金属膜电容,当放电时间t为lms时,可计算得^= 19. 3V,整个间歇周期100ms内容电阻R3上消耗的平均功率为:1.9W,三极管Q2中的瞬时最大电流为Uc/R3 = 3. 45 A。 The actual parameter takes cement resistor R3 is 900 / 4W of, Cl to 4uF metal film capacitors, when the discharging time t is LMS, calculated to give ^ = 19. 3V, the consumption of the contents of the resistor R3 100ms average power entire rest period: 1.9W, transistor Q2 of the maximum instantaneous current Uc / R3 = 3. 45 A.

在低功率段工作时,单片机每检测到IO个过零信号产生一次放电 Work at low power section, a single-chip IO is detected every zero-cross signal is generated once the discharge

信号,根据输入电压的不同,放电时间在0.5ms-1.2ms之间不等,放电结束后立即启动谐振电路,谐振电路工作30ms后停止,待70ms后的第一个过零信号到达时,再次产生放电信号重复上一个周期的工作状态。 Signal, depending on the input voltage, the discharge time between 0.5ms-1.2ms range, starting immediately after the discharge end of the resonant circuit, the resonant circuit stops 30ms, the first to be 70ms after a zero-crossing signal arrives, again discharge signal generating operating state of a repeat cycle. 这样,当单片机输入P丽值对应大功率段的2000W时,实际功率为600W,而当P丽值对应大功率段的800W时,实际功率为240W。 Thus, when the microcontroller corresponding to the input value P Li section 2000W power, the actual power of 600W, and when the value corresponding to 800W power P Li segment, the actual power of 240W.

Claims (6)

1、一种电磁炉低功率段连续加热控制装置,其特征在于包括有电源电路(1)、中央处理单元(2),放电电路(3)、控制电路(4)、谐振电路(5)、市电过零检测电路(6)及功率管(IGBT),其中电源电路(1)分别给中央处理单元(2),放电电路(3)、控制电路(4)、谐振电路(5)、市电过零检测电路(6)及功率管(IGBT)供电,市电过零检测电路(6)的信号输出端与中央处理单元(2)的输入端连接,中央处理单元(2)的输出端分别与放电电路(3)及控制电路(4)的输入端连接,控制电路(4)的输出端与谐振电路(5)的输入端连接,谐振电路(5)的输出端与功率管(IGBT)连接。 1 A continuous heating cooker low power section control device comprising a power circuit (1), a central processing unit (2), the discharge circuit (3), the control circuit (4), the resonant circuit (5), City electric zero-crossing detection circuit (6) and the power tube (the IGBT), wherein the power supply circuit (1) to, respectively, a central processing unit (2), the discharge circuit (3), the control circuit (4), the resonant circuit (5), the mains zero-crossing detecting circuit (6) and a power transistor (IGBT) power mains zero-crossing detection circuit (6) a signal output terminal of a central processing unit (2) connected to the input, a central processing unit (2) output terminal, respectively, an input terminal connected to the discharge circuit (3) and a control circuit (4), the control circuit (4) an input terminal an output terminal of the resonant circuit (5) is connected to the output terminal of the resonant circuit (5) and the power transistor (IGBT) connection.
2、 根据权利要求l所述的电磁炉低功率段连续加热控制装置,其特征在于上述中央处理单元(2)为单片机。 2. The low power section cooker according to claim l continuous heating control means, wherein said central processing unit (2) for the microcontroller.
3、 根据权利要求1或2所述的电磁炉低功率段连续加热控制装置,其特征在于上述巿电过零检测电路(6)包括有电阻R1,R2,RJ1,三极管Ql,其中三极管Ql的发射极接地,三极管Ql的基极分别与电阻RJ1的一端及电阻Rl 的一端连接,电阻RH的另一端接地,电阻R1的另一端通过二极管D3与电源电路(1)连接及与二极管D1、 D2连接,二极管D1、 D2的输入端与巿电连接, 输出端与整流桥DB1连接,三极管Ql的集电极通过电阻R2与电源连接。 3. The low power section or cooker according to claim 12 continuous heating control means, wherein said zero-crossing detecting circuit electrically market (6) comprising a resistor R1, R2, RJ1, transistor Ql, the emitter of which transistor Ql is grounded, the transistor Ql base are respectively connected to one end and the resistor Rl resistance RJ1, and the other end of the resistor RH, and the other end of the resistor R1 and the diode D1 through a diode D3 and a power supply circuit (1), D2 is connected , diodes D1, D2 input terminal is electrically connected to the market, the output terminal of the rectifier bridge DB1 is connected to the collector of transistor Ql is connected to the power supply through resistor R2.
4、根据权利要求3所述的电磁炉低功率段连续加热控制装置,其特征在于上述放电电路(3)包括有电阻R3,R6,R7,三极管Q2,其中三极管Q2的发射极接地,三极管Q2的集电极通过电阻R3与扼流圈L1及电容C1的一端连接,电容C1的另一端接地及与整流桥DB1的输出端连接,扼流圈L1的另一端与整流桥DB1的输出端连接,三极管Q2的基极分别与电阻R6,R7连接,电阻R6的另一端接地,电阻R7的另一端与中央处理单元(2)连接。 4. The low power section of the cooker as claimed in claim 3, the continuous heating control means, wherein said discharge circuit (3) comprises a resistor R3, R6, R7, transistor Q2, wherein emitter of the transistor Q2 is grounded, transistor Q2 the collector through a resistor R3 to one end of the choke coil L1 and a capacitor C1 is connected to the output terminal of the other end of the capacitor C1 and the rectifier bridge DB1 is connected to the other end of the output terminal of the rectifier bridge DB1 is connected to the choke coil L1, transistor the base of Q2, respectively resistors R6, R7, and the other end of the resistor R6, and the other end of the resistor R7 and a central processing unit (2) is connected.
5、 根据权利要求4所述的电磁炉低功率段连续加热控制装置,其特征在于上述包括有谐振电路(5 )包括有电容C2和电感L2,电容C2与电感L2组成的并联电路的一端分别与电阻R3、扼流圈L1及电容C1连接,电容C2与电感L2 组成的并联电路的另一端与功率管UGBT)连接,且电容C2与电感L2组成的并联电路的两端分别通过电阻R4、 R5将谐振电路(5)的同步信号引入控制电路(4)。 5. The low power section cooker as claimed in claim 4, wherein the continuous heating control apparatus comprising wherein said resonant circuit (5) comprises a capacitor C2 and one end of inductor L2, capacitor C2 and a parallel circuit composed of inductor L2, respectively both ends of the parallel circuit of the resistor R3, a choke coil L1 and a capacitor C1 is connected, the capacitor C2 and the inductor L2 of the parallel circuit composed of the other end of the power transistor UGBT) connected with the inductor L2 and capacitor C2 respectively composed of resistors R4, R5 the resonant circuit (5) introduced into the synchronizing signal control circuit (4).
6、 根据权利要求5所述的电磁炉低功率段连续加热控制装置,其特征在于上述功率管(IGBT)的基极与发射极之间还并接有电阻R8及稳压二极管ZD1。 6. The low power section cooker claimed in claim 5, wherein the continuous heating control means, wherein said power-yl tube (IGBT) of the pole and also between the emitter and the resistor R8 and is connected with the zener diode ZD1.
CNU2008202043143U 2008-11-28 2008-11-28 Control device of continuous heating during low power period of electromagnetic oven CN201323669Y (en)

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CN102252355A (en) * 2011-08-05 2011-11-23 美的集团有限公司 Continuous low-power heating control method for electromagnetic oven
CN103731945A (en) * 2012-10-11 2014-04-16 美的集团股份有限公司 Controlling method and controlling circuit for preventing electromagnetic heating device from stopping oscillation
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CN103731945A (en) * 2012-10-11 2014-04-16 美的集团股份有限公司 Controlling method and controlling circuit for preventing electromagnetic heating device from stopping oscillation
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CN106813271A (en) * 2015-11-27 2017-06-09 佛山市顺德区美的电热电器制造有限公司 A kind of low-power laser heating electromagnetic oven
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CN107027202A (en) * 2016-02-02 2017-08-08 佛山市顺德区美的电热电器制造有限公司 Electromagnetic Heating cooker and its heating control circuit and method for heating and controlling
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