Furnace end mute control circuit and electric flame stove

Abstract

The utility model relates to a furnace end mute control circuit and an electric flame stove. The furnace end mute control circuit comprises a pulse width modulation circuit, a DAC control output circuit used for receiving set gear parameters, a first switching circuit and a second switching circuit, wherein the first switching circuit and the second switching circuit are used for being connected with a driving circuit; the output end of the DAC control output circuit is connected with the input end of the pulse width modulation circuit so as to correspondingly output a preset voltage value according to a set gear parameter, and the preset voltage value is output to the pulse width modulation circuit; the pulse width modulation circuit is used for carrying out PWM modulation control on an input signal and can output a high-frequency PWM driving signal with a small pulse width, and the output end of the pulse width modulation circuit is connected with the first switching circuit and the second switching circuit so as to output the PWM driving signal to the first switching circuit and the second switching circuit; it is ensured that large-span electric arcs cannot be generated during gear adjustment of a burner, then noise cannot be generated, and the use experience feeling is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of furnace head mute control circuit, and it is mainly applied to electric flame range, especially a kind of furnace head mute control circuit and electric flame range. BACKGROUND

[0002] With the continuous improvement of people's living standards, various new and intelligent life devices are gradually emerging, which not only bring great convenience to people's life and improve people's quality of life and level, but also enable people to have a healthier lifestyle and achieve energy-saving effect.

[0003] Among them, electric flame range, as a new type of life device, has gradually been popularized in people's daily life, and food can be cooked through electric flame range to replace the traditional technology of burning natural gas and other chemical fuels for heating. Electric flame range only converts to achieve the effect of food cooking, which not only reduces people's dependence on fossil fuels, but also does not produce any toxic and harmful gases during heating, belongs to completely clean combustion, and greatly improves the utilization rate and conversion rate of electric energy. Combined with the above many advantages, electric flame range will have an important positive impact on people's home life in the future.

[0004] The working principle of electric flame range is to raise the voltage by high-voltage transformer and output high-voltage electricity to voltage doubler rectifier circuit, and then transmit the high-voltage electricity to the corresponding plasma torch by each group of parallel voltage doubler rectifier circuit.

[0005] The high-voltage transformer of the existing electric flame range is generally driven by full-bridge LLC, and the existing pulse width modulation circuit output is directly connected to the full-bridge LLC by the main control unit. However, the pulse width output by the existing pulse width modulation circuit is high, generally 1KHz. When using the knob to adjust the gear, the 1KHz pulse width will cause the full-bridge LLC to stop for a moment, which will cause the furnace head to have intermittent arc interruption, thereby emitting a clicking noise, affecting the user's experience.

[0006] Therefore, in the utility model patent application, the applicant carefully studies a kind of furnace head mute control circuit and electric flame range to solve the above problems. INVENTION CONTENTS

[0007] The utility model mainly aims at providing a kind of furnace head mute control circuit and electric flame range to solve the above problems, which can ensure that the furnace head does not produce large-span arc during gear adjustment, thereby not producing noise and improving user experience.

[0008] In order to achieve the above-mentioned purpose, the utility model adopts the following technical scheme:

[0009] A furnace head mute control circuit, including pulse width modulation circuit, DAC control output circuit for receiving the gear parameter of setting and first switch circuit, second switch circuit for connecting driving circuit,

[0010] The output end of DAC control output circuit connects the input end of pulse width modulation circuit to output preset voltage value according to the gear parameter of setting, and the preset voltage value is output to the pulse width modulation circuit,

[0011] The pulse width modulation circuit is used for PWM modulation control to the input signal, and the high-frequency PWM drive signal of smaller pulse width can be output, and the output end of the pulse width modulation circuit is connected with the first switch circuit and the second switch circuit respectively to output PWM drive signal to the first switch circuit and the second switch circuit.

[0012] As a preferred scheme, the first switch circuit includes MOS tube Q1, resistance R750, resistance R756, resistance R6 and capacitor C377;

[0013] The gate of MOS tube Q1 is connected with the output end of pulse width modulation circuit through resistance R756, and the gate of MOS tube is also connected with its source through resistance R6, the source of MOS tube Q1 is connected with signal ground, resistance R750 and capacitor C377 are connected in series, the non-series node of resistance R750 is connected with the drain of MOS tube Q1, the drain of MOS tube Q1 is used for connecting driving circuit, and the non-series node of capacitor C377 is connected with the source of MOS tube Q1.

[0014] As a preferred scheme, the second switch circuit includes MOS tube Q2, resistance R751, resistance R757, resistance R3 and capacitor C378;

[0015] The gate of MOS tube Q2 is connected with the output end of pulse width modulation circuit through resistance R757, and the gate of MOS tube Q2 is also connected with its source through resistance R3, the source of MOS tube Q2 is connected with signal ground, resistance R751 and capacitor C378 are connected in series, the non-series node of resistance R751 is connected with the drain of MOS tube Q2, the drain of MOS tube Q2 is connected with driving circuit, and the non-series node of capacitor C378 is connected with the source of MOS tube Q2.

[0016] As a preferred scheme, the output end of the first switch circuit and the second switch circuit is commonly connected with output interface circuit for connecting driving circuit.

[0017] As a preferred solution, the output interface circuit comprises a magnetic bead FB6, a magnetic bead FB3, a bidirectional voltage stabilizing diode D4, a polarity capacitor C195, and an interface J6 for connecting a driving circuit;

[0018] Pin 1 of the interface J6 is connected to pin 1 of the bidirectional voltage stabilizing diode D4, pin 2 of the bidirectional voltage stabilizing diode D4 and pin 2 of the interface J6 are grounded through the magnetic bead FB6 in common, pin 3 of the interface J6 is connected to a signal ground, pin 4 of the interface J6 is connected to an output end of the first switch circuit, pin 5 of the interface J6 is connected to an output end of the second switch circuit, and pin 1 of the interface J6 is further connected to a positive pole of the polarity capacitor C195 through the magnetic bead FB3, and the positive pole of the polarity capacitor C195 is used for connecting a VDD 12V voltage end, and a negative pole of the polarity capacitor C195 is grounded.

[0019] An electric flame stove comprises the stove head mute control circuit.

[0020] Compared with the prior art, the utility model has obvious advantages and beneficial effects, specifically speaking: it is mainly the cooperation of the pulse width modulation circuit, the DAC control output circuit, the first switch circuit and the second switch circuit, can make the pulse width modulation circuit continuously output high-frequency PWM drive signal with small pulse width, so as to ensure that the electric arc with large span is not generated when the gear of the stove head is adjusted, then noise is not generated, and the use experience is improved.

[0021] Through the output interface circuit, plug-in connection between the driving circuit is realized, and replacement and maintenance are facilitated.

[0022] In order to more clearly set forth the structural features and functions of the utility model, the following will be combined with the specific embodiments and the drawings to be described in detail. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 It is the principle block diagram of the embodiment of the utility model;

[0024] Figure 2 It is the circuit principle diagram of the embodiment of the utility model.

[0025] EXPLANATION OF REFERENCE NUMBERS:

[0026] 11, control knob

[0027] 12, main control unit

[0028] 13, DAC control output circuit

[0029] 14, pulse width modulation circuit

[0030] 151, first switch circuit

[0031] 152, second switch circuit

[0032] 16. An output interface circuit

[0033] 17. A drive circuit. DETAILED DESCRIPTION

[0034] The utility model will be further described below in combination with the drawings and specific embodiments.

[0035] As shown in Figure 1 and Figure 2 A furnace head mute control circuit, comprising pulse width modulation circuit 14, DAC control output circuit 13 for receiving the set gear parameter and first switch circuit 151, second switch circuit 152 for connecting drive circuit 17.

[0036] In this embodiment, DAC control output circuit 13 can receive adjustable voltage of 0 to 3.3V.

[0037] The output end of DAC control output circuit 13 is connected with the input end of pulse width modulation circuit 14 to output preset voltage value corresponding to the set gear parameter to the pulse width modulation circuit 14.

[0038] In this embodiment, DAC control output circuit 13 comprises DAC conversion unit and triode Q9. After receiving the set gear parameter from the main control unit 12 of electric flame, DAC control output circuit 13 outputs analog voltage corresponding to the set gear parameter.

[0039] The DAC conversion unit comprises chip U6, and the model of chip U6 is LM358, of course, other models can also be used, which are not limited herein. The signal input end of chip U6 is connected with the main control unit 12 through three-order low-pass filter circuit. The three-order low-pass filter circuit comprises resistance R765, resistance R764, resistance R763, capacitor C384, capacitor C383 and capacitor C382.

[0040] The pulse width modulation circuit 14 is used for PWM modulation control of the input signal, and can output high-frequency PWM drive signal with small pulse width.

[0041] In this embodiment, the pulse width modulation circuit 14 comprises chip U7, and the model of chip U7 is SG3525, of course, other models can also be used, which are not limited herein.

[0042] The output end of pulse width modulation circuit 14 is connected with first switch circuit 151 and second switch circuit 152 respectively to output PWM drive signal to first switch circuit 151 and second switch circuit 152 respectively.

[0043] The output end of the pulse width modulation circuit 14 includes a first output end and a second output end. The first output end is connected with the first switch circuit 151, and the second output end is connected with the second switch circuit 152.

[0044] The PWMA pin of the chip U7 (which is the first output end) is connected with the gate of the switch MOS Q1 of the first switch circuit 151 through the sixth resistor R756, and the PWMB pin of the chip U7 (which is the second output end) is connected with the gate of the switch MOS Q2 of the second switch circuit 152 through the sixth resistor R757.

[0045] In the embodiment, the first switch circuit 151 includes the MOS Q1, the resistor R750, the resistor R756, the resistor R6 and the capacitor C377.

[0046] The gate of the MOS Q1 is connected with the output end of the pulse width modulation circuit 14 through the resistor R756, and the gate of the MOS Q1 is also connected with the source of the MOS Q1 through the resistor R6. The source of the MOS Q1 is connected with the signal ground. The resistor R750 and the capacitor C377 are connected in series. The non-series node of the resistor R750 is connected with the drain of the MOS Q1. The drain of the MOS Q1 is used for connecting the driving circuit 17. The non-series node of the capacitor C377 is connected with the source of the MOS Q1.

[0047] In the embodiment, the second switch circuit 152 includes the MOS Q2, the resistor R751, the resistor R757, the resistor R3 and the capacitor C378.

[0048] The gate of the MOS Q2 is connected with the output end of the pulse width modulation circuit 14 through the resistor R757, and the gate of the MOS Q2 is also connected with the source of the MOS Q2 through the resistor R3. The source of the MOS Q2 is connected with the signal ground. The resistor R751 and the capacitor C378 are connected in series. The non-series node of the resistor R751 is connected with the drain of the MOS Q2. The drain of the MOS Q2 is connected with the driving circuit 17. The non-series node of the capacitor C378 is connected with the source of the MOS Q2.

[0049] In the embodiment, the output ends of the first switch circuit 151 and the second switch circuit 152 are commonly connected with the output interface circuit 16 used for connecting the driving circuit 17.

[0050] The output interface circuit 16 includes the magnetic bead FB6, the magnetic bead FB3, the bidirectional voltage stabilizing diode D4, the polarity capacitor C195 and the interface J6 used for connecting the driving circuit 17.

[0051] Pin 1 of interface J6 is connected to pin 1 of bidirectional voltage stabilizing diode D4, pin 2 of bidirectional voltage stabilizing diode D4 and pin 2 of interface J6 are grounded through magnetic bead FB6 in common, pin 3 of interface J6 is connected to signal ground, pin 4 of interface J6 is connected to the output of first switch circuit 151, that is, pin 4 of interface J6 is connected to the drain of switch MOS Q1, pin 5 of interface J6 is connected to the output of second switch circuit 152, that is, pin 5 of interface J6 is connected to the drain of switch MOS Q2, pin 1 of interface J6 is also connected to the positive pole of polarity capacitor C195 through magnetic bead FB3, and the positive pole of polarity capacitor C195 is used for connecting VDD 12V voltage terminal, and the negative pole of polarity capacitor C195 is grounded.

[0052] An electric flame stove comprises a control knob 11, a main control unit 12 and the stove head mute control circuit, the control knob 11 is connected to the main control unit 12 to output a set gear parameter to the main control unit 12, and the main control unit 12 is connected to the stove head mute control circuit to output a corresponding digital control signal to the stove head mute control circuit according to the received set gear parameter.

[0053] The utility model discloses design main points at, it mainly is the cooperation of pulse width modulation circuit, DAC control output circuit, first switch circuit and second switch circuit, can make pulse width modulation circuit continuous output smaller pulse width's high frequency PWM drive signal, to ensure that the stove head will not produce the arc of big span when gear adjustment, in turn will not produce the noise, improve the use experience feeling;

[0054] Through the output interface circuit, plug-in connection between the driving circuit is realized, and replacement and maintenance are facilitated.

[0055] The above is only the preferred embodiment of the utility model, and does not limit the technical range of the utility model, so any slight modification, equivalent change and modification according to the technical essence of the utility model are still within the technical range of the utility model.

Claims

1. A burner tip quiet control circuit, characterized by: The first switch circuit and the second switch circuit are connected with the output interface circuit. The output end of the DAC control output circuit is connected with the input end of the pulse width modulation circuit to output a preset voltage value corresponding to the set gear parameter according to the set gear parameter. The pulse width modulation circuit is used for PWM modulation control of the input signal, and can output a high-frequency PWM drive signal with a small pulse width.

2. The burner head silent control circuit of claim 1, wherein: The first switch circuit comprises a MOS tube Q1, a resistor R750, a resistor R756, a resistor R6 and a capacitor C377. The gate of the MOS tube Q1 is connected with the output end of the pulse width modulation circuit through the resistor R756, and the gate of the MOS tube is also connected with the source thereof through the resistor R6.

3. The burner tip mute control circuit of claim 1, wherein: The second switch circuit comprises a MOS tube Q2, a resistor R751, a resistor R757, a resistor R3 and a capacitor C378. The gate of the MOS tube Q2 is connected with the output end of the pulse width modulation circuit through the resistor R757, and the gate of the MOS tube Q2 is also connected with the source thereof through the resistor R3.

4. The burner tip mute control circuit of claim 1, wherein: The output ends of the first switch circuit and the second switch circuit are commonly connected with the output interface circuit used for connecting the driving circuit.

5. The burner head silence control circuit of claim 4, wherein: The output interface circuit comprises a magnetic bead FB6, a magnetic bead FB3, a bidirectional voltage stabilizing diode D4, a polarity capacitor C195 and an interface J6 used for connecting the driving circuit. The pin 1 of the interface J6 is connected with the pin 1 of the bidirectional voltage stabilizing diode D4, the pin 2 of the bidirectional voltage stabilizing diode D4 and the pin 2 of the interface J6 are commonly grounded through the magnetic bead FB6, the pin 3 of the interface J6 is connected with the signal ground, the pin 4 of the interface J6 is connected with the output end of the first switch circuit, the pin 5 of the interface J6 is connected with the output end of the second switch circuit of the second switch circuit, and the pin 1 of the interface J6 is also connected with the positive pole of the polarity capacitor C195 through the magnetic bead FB3.

6. An electric flame, characterized by: The furnace head mute control circuit comprises the furnace head mute control circuit according to any one of claims 1 to 5.

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