Integrated cooker fan control circuit

Abstract

The utility model relates to the field of integrated cookers, in particular to a fan control circuit of an integrated cooker, which comprises a singlechip unit UA1, an MOSFET (Metal-Oxide-Semiconductor Field Effect Transistor) driving module and an IGBT (Insulated Gate Bipolar Translator The input end of the MOSFET driving module is connected with the single chip microcomputer unit UA1, the output end of the MOSFET driving module is connected with the IGBT switch module, and a three-phase line of a fan motor JO1 is connected with the MOSFET driving module and the IGBT switch module; the single-chip microcomputer unit UA1 drives the IGBT switch module to work through the MOSFET driving module, the IGBT switch module is sequentially conducted according to alternating signals of the three-phase lines of the fan motor JO1, and direct current signals of the three-phase lines of the fan motor JO1 are obtained and stored in the single-chip microcomputer unit. According to the scheme, the motor power of the integrated stove air bellow can be effectively adjusted and controlled, simultaneous working of multiple fans in the integrated stove air bellow becomes possible, static pressure in the integrated stove air bellow is not limited by the power of a single fan, and smooth air exhaust is ensured.

Description

Technical Field

[0001] The utility model relates to the field of integrated stove electrical control, in particular to an integrated stove fan control circuit. Background Art

[0002] Integrated stove is a kitchen appliance that integrates multiple functions such as range hood, gas stove, disinfection cabinet, storage cabinet, etc. It is also called environmentally friendly stove or integrated environmentally friendly stove in the industry. It has the advantages of saving space, good fume extraction effect, energy saving, low consumption and environmental protection. The working principle of the integrated stove is to start the fan in the bellows below, and the fan volute generates negative pressure, which cooperates with the side suction cavity to suck the fume from the top of the stove and discharge it through the air outlet.

[0003] Existing integrated stoves are generally single-fan structures, with the air outlet leading to the outside world or the public flue in the kitchen. Therefore, the static pressure formed by the integrated stove fan after operation must be at least greater than the external pressure of the integrated stove exhaust port to smoothly discharge the smoke. Since the external wind resistance will change over time, the difference with the static pressure inside the bellows will also change differently. When the static pressure is relatively small, the air outlet cannot be opened smoothly, and a large noise will also be generated.

[0004] The bellows of the integrated stove are at the lower back, and the overall space is flat. If a larger motor is replaced to increase the static pressure, it cannot be properly installed due to the existing space limitations. Therefore, increasing the static pressure of the bellows has always been a difficult problem in the industry.

[0005] In view of this, the applicant conducted research and improvements on the integrated stove and developed an integrated stove fan control circuit, which resulted in this case. Utility Model Content

[0006] The purpose of the utility model is to provide an integrated stove fan control circuit, which can effectively adjust and control the power of the integrated stove bellows motor, so that multiple fans in the integrated stove bellows can work simultaneously. As long as the power of each fan is changed and adjusted, the static pressure in the integrated stove bellows will not be limited by the power of a single fan, ensuring smooth exhaust.

[0007] In order to achieve the above purpose, the technical solution of the utility model is as follows:

[0008] An integrated stove fan control circuit, comprising:

[0009] Single-chip computer unit UA1, MOSFET driving module, IGBT switch module; the input end of the MOSFET driving module is connected to the single-chip computer unit UA1, the output end of the MOSFET driving module is connected to the IGBT switch module, and the three-phase line of the fan motor JO1 is connected to the MOSFET driving module and the IGBT switch module; the single-chip computer unit UA1 drives the IGBT switch module to work through the MOSFET driving module, and the IGBT switch module is turned on in turn according to the alternating signal of the three-phase line of the fan motor JO1, and a DC current signal of the three-phase line of the fan motor JO1 is obtained, and stored in the single-chip computer unit.

[0010] The single chip unit UA1 is connected to an overvoltage protection circuit.

[0011] The overvoltage protection circuit includes a SMD dual series switching diode, pin 3 of the SMD dual series switching diode is connected to the microcontroller unit power supply pin VBUS_AIN, and the microcontroller unit power supply pin VBUS_AIN is connected to a 310V power supply through a series resistor; pin 1 of the SMD dual series switching diode is grounded, and pin 2 of the SMD dual series switching diode is connected to a 5V power supply.

[0012] The overvoltage protection circuit has a single-chip microcomputer unit power supply pin VBUS_AIN that is grounded through filtering by capacitor CP16.

[0013] A resistor RP6 is connected between pin 3 and pin 1 of the SMD dual series switching diode.

[0014] The MOSFET driving module includes a driving chip IR2106 corresponding to each of the three phases U, V, and W. The HIN pin and LIN housekeeper of the driving chip IR2106 are respectively connected to the high and low level output pins of the three phases U, V, and W of the fan motor on the single-chip unit through resistors. The VCC pin of the driving chip IR2106 is connected to the +15V power supply through a pull-up resistor and is grounded through a capacitor filter. A diode is connected in series between the VCC pin and the VB pin of the driving chip IR2106. and a resistor, two capacitors are connected in parallel between the VB pin and VS pin of the driver chip IR2106, the VS pin of the driver chip IR2106 is externally connected to the three-phase U, V, W of the fan motor, the COM pin of the driver chip IR2106 is grounded, the HO pin and LO pin of the driver chip IR2106 are externally connected to the high and low input terminals on the U, V, W three-phases of the fan motor on the IGBT switch module corresponding to the fan motor; the VS pin of the driver chip IR2106 is connected to the U, V, W three-phase lines of the fan motor.

[0015] The IGBT switch module comprises a switch circuit composed of two field effect transistors arranged in correspondence with the three phases U, V and W of the fan motor.

[0016] The U phase of the fan motor includes field effect tubes Q1 and Q2, the source of the field effect tube Q1 is connected to the drain of the field effect tube Q2, and the gate of the field effect tube Q1 is connected to the high-level output end of the driver chip IR2106 corresponding to the U phase of the fan motor through a resistor R11; the protection circuit formed by the reverse-connected diode DO4 and the resistor R10 is connected in parallel at both ends of the resistor R11; a resistor R22 and a capacitor CO1 are connected in parallel between the gate and source of the field effect tube Q1; the drain of the field effect tube Q1 is grounded through a capacitor CO24; the field effect tube The gate of Q2 is connected to the low-level output terminal of the driver chip IR2106 corresponding to the fan motor U through the resistor R13; the protection circuit formed by the reverse-connected diode DO5 and the resistor R12 is connected in parallel at both ends of the resistor R13; the resistor R23 and the capacitor CO2 are connected in parallel between the gate and the source of the field effect tube Q2; the source of the field effect tube Q2 is connected to the ground through the series resistor R26 and the resistor R28; the source of the field effect tube Q1 is connected to the U phase line of the fan motor; the current at the source end of the field effect tube Q2 is the U phase current signal I_U;

[0017] The V phase of the fan motor includes field effect tubes Q3 and Q4, the source of the field effect tube Q3 is connected to the drain of the field effect tube Q4, and the gate of the field effect tube Q3 is connected to the high-level output end of the driver chip IR2106 corresponding to the V phase of the fan motor through a resistor R15; the protection circuit formed by the reverse-connected diode DO6 and the resistor R14 is connected in parallel at both ends of the resistor R15; a resistor R24 ​​and a capacitor CO3 are connected in parallel between the gate and source of the field effect tube Q3; the drain of the field effect tube Q3 is connected to the drain of the field effect tube Q1; the field effect tube The gate of Q4 is connected to the low-level output terminal of the driver chip IR2106 corresponding to the V phase of the fan motor through the resistor R17; the protection circuit formed by the reverse-connected diode DO7 and the resistor R16 is connected in parallel at both ends of the resistor R17; the resistor R25 and the capacitor CO4 are connected in parallel between the gate and the source of the field effect tube Q4; the source of the field effect tube Q4 is connected to the ground through the series resistor R27 and the resistor R28; the source of the field effect tube Q3 is externally connected to the V phase line of the fan motor; the current at the source end of the field effect tube Q2 is the V phase current signal I_V;

[0018] The W phase of the fan motor includes field effect tubes Q5 and Q6, the source of field effect tube Q5 is connected to the drain of field effect tube Q6, and the gate of field effect tube Q5 is connected to the high level output end of driver chip IR2106 corresponding to the W phase of the fan motor through resistor R19; the protection circuit formed by reverse-connected diode DO9 and resistor R20 is connected in parallel at both ends of resistor R19; resistor R26 and capacitor CO5 are connected in parallel between the gate and source of field effect tube Q5; the drain of field effect tube Q5 is connected to the drain of field effect tube Q1; field The gate of the field effect tube Q6 is connected to the low level output terminal of the driver chip IR2106 corresponding to the fan motor W through the resistor R21; the protection circuit formed by the reverse-connected diode DO9 and the resistor R20 is connected in parallel at both ends of the resistor R21; the resistor R27 and the capacitor CO6 are connected in parallel between the gate and the source of the field effect tube Q6; the source of the field effect tube Q6 is grounded through the resistor R28; the source of the field effect tube Q5 is connected to the W phase line of the fan motor; the current at the source end of the field effect tube Q6 is the W phase current signal I_SHUNT;

[0019] The current signal I_U and the current signal I_V are amplified inside the single-chip unit UA1 to obtain the fan motor U-phase DC current signal I_U_AD and the fan motor V-phase DC current signal I_V_AD, thereby obtaining the fan motor W-phase DC current signal I_W_AD.

[0020] The IGBT switch module is provided with a temperature detection circuit in the center of the area corresponding to the back side of the circuit board.

[0021] The temperature detection circuit includes a thermistor R40, one end of which is connected to a +5V voltage through a pull-up resistor R39, and the other end is grounded; the connection end between the thermistor R40 and the pull-up resistor R39 is grounded through a resistor R41 and a capacitor C28 connected in series in sequence.

[0022] After adopting the above scheme, the utility model has the following advantages:

[0023] The three-phase AC input on the fan motor JO1, the single-chip unit UA1 is connected to the input end of the MOSFET driver module to form a drive signal. The three-phase line of the fan motor JO1 turns on the switch circuit corresponding to the three phases U, V, and W of the MOSFET driver module in turn, and collects the three-phase DC current signals I_U, I_V, and I_SHUNT of U, V, and W, so as to obtain the DC current signals I_U_AD, I_V_AD, and I_W_AD corresponding to the fan motor to obtain the power value of the fan motor JO1. The drive signal at the input end of the MOSFET driver module is linked with the three-phase DC current signals I_U, I_V, and I_SHUNT of U, V, and W. When the drive signal at the input end of the MOSFET driver module increases, the DC current signal of the three-phase line of the fan motor becomes larger, the fan motor power increases, the wind force increases, and the static pressure value in the wind box increases. On the contrary, it decreases, the fan motor power decreases, the wind force weakens, and the static pressure value in the wind box decreases.

[0024] Therefore, when applied to integrated stoves with multiple fans, multiple fans can be set up for use in the same air duct, and each fan is equipped with a fan control circuit. The joint action of multiple fans makes the static pressure of the entire bellows not limited by a single motor. The wind pressure value outside the integrated stove outlet is collected and compared with the motor power. If the wind pressure at the outlet is large, the output drive signal of the single-chip unit UA1 on each fan of the integrated stove can be used to adjust the power of each fan. The linkage of multiple fans increases the total power and increases the static pressure value in the bellows. Conversely, the power of each fan is controlled to decrease and the static pressure of the bellows is reduced. The entire integrated stove bellows is in a dynamic automatic adjustment process. The static pressure in the bellows is no longer limited by a single motor, and the exhaust effect is greatly improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a schematic diagram of the single chip unit UA1 of a preferred embodiment of the utility model;

[0026] Figure 2 This is an overvoltage protection circuit diagram of a preferred embodiment of the utility model;

[0027] Figure 3 This is a circuit diagram of a MOSFET driving module of a preferred embodiment of the utility model;

[0028] Figure 4 This is a circuit diagram of an IGBT switch module of a preferred embodiment of the utility model;

[0029] Figure 5 This is an amplifier circuit diagram of a preferred embodiment of the utility model;

[0030] Figure 6 This is a temperature detection circuit diagram of a preferred embodiment of the utility model;

[0031] Figure 7 It is a schematic diagram of the product structure of a preferred embodiment of the utility model. DETAILED DESCRIPTION

[0032] The utility model is further described below in conjunction with the accompanying drawings and specific embodiments.

[0033] An integrated stove fan control circuit mainly involves components including a single-chip unit UA1, a MOSFET driver module, an IGBT switch module, an overvoltage protection circuit, a temperature detection circuit and other modules. The three-phase line UVW of the integrated stove fan motor JO1 is connected to the MOSFET driver module and the IGBT switch module. The MOSFET driver module is connected to the single-chip unit UA1. The drive signal is input to the MOSFET driver module through the single-chip unit UA1. As the three-phase line is turned on in turn, the three-phase DC current signals I_U, I_V, and I_SHUNT corresponding to the three-phase line UVW and the working angle of the fan motor JO1 rotor can be obtained and stored in the single-chip unit UA1. The working state and power size of the fan motor are judged according to the collected DC current signal and working angle.

[0034] When applied to the bellows of an integrated stove, the outlet pressure of the corresponding fan can be collected and compared with the DC current signal collected by the control circuit. The DC current signal, that is, the power of the fan motor, is changed by adjusting the size of the drive signal through the single-chip computer unit UA1, so that the static pressure in the wind direction is adjusted to a suitable value, and the air outlet can be opened smoothly to achieve smoke exhaust.

[0035] The existing integrated stove products all have a single fan structure, which is limited by the shape and volume of the integrated stove bellows, and it is impossible to adjust the fan power by replacing a large motor. Therefore, the utility model can make multiple fans of the size of the integrated stove bellows work together to increase the total working power of multiple fans, break through the limitation of the original single fan power, and greatly improve the exhaust effect. Figure 7 This is a scenario in which the present utility model is applied.

[0036] See also Figure 1 The single-chip microcomputer unit UA1 chip in this embodiment can use a 32-bit processor such as Toshiba TMPM374 or Fudan Micro FM33LF013. The power supply pin ABUS_AIN of the single-chip microcomputer unit UA1 is connected to an overvoltage protection circuit. Figure 2The overvoltage protection circuit includes a SMD dual series switching diode BAV99A7W, pin 3 of the SMD dual series switching diode BAV99A7W is connected to the single-chip unit power supply pin VBUS_AIN, pin 1 of the SMD dual series switching diode BAV99A7W is grounded, pin 2 of the SMD dual series switching diode BAV99A7W is connected to a 5V power supply, and a resistor RP6 is connected in series between pins 1 and 3 of the SMD dual series switching diode BAV99A7W. The single-chip unit power supply pin VBUS_AIN is connected to a 310V power supply through resistors RP3, RP4, and RP5 in series, and the single-chip unit power supply pin VBUS_AIN is grounded through a capacitor CP16 filter. Through the matching setting of the pull-up resistor and the SMD dual series switching diode, the power supply of the single-chip unit UA1 is protected by voltage division, which effectively prevents the high voltage from affecting the operation of the single-chip unit UA1.

[0037] Combination Figure 3 The MOSFET driving module in this embodiment includes a driving chip IR2106 corresponding to each of the three phases U, V, and W, namely, a driving chip U3, a driving chip U4, and a driving chip U5. The HIN pin of the driver chip U3 is connected to the H_DU pin of the microcontroller unit UA1 through a resistor R1, the LIN pin of the driver chip U3 is connected to the L_DU pin of the microcontroller unit UA1 through a resistor R2, and the H_DU pin and the L_DU pin are grounded through capacitors C1 and C2 respectively. The VCC pin of the driver chip U3 is connected to the +15V power supply through a resistor R50, and is grounded through a capacitor C18. A diode D8 and a resistor R60 are connected in series between the VCC pin and the VB pin of the driver chip U3, and two capacitors C19 and C20 are connected in parallel between the VB pin and the VS pin of the driver chip U3. The VS pin of the driver chip U3 is connected to the U phase line of the fan motor J0, the COM pin of the driver chip U3 is grounded, and the HO pin and the LO pin of the driver chip U3 are respectively connected to the high and low input terminals on the U phase of the fan motor on the IGBT switch module corresponding to the IGBT switch module.

[0038] The HIN pin of the driver chip U4 is connected to the H_DV pin of the microcontroller unit UA1 through a resistor R3, the LIN pin of the driver chip U3 is connected to the L_DV pin of the microcontroller unit UA1 through a resistor R4, and the H_DV pin and the L_DV pin are grounded through capacitors C4 and C5 respectively, the VCC pin of the driver chip U4 is connected to the +15V power supply through a resistor R62, and is grounded through a capacitor C21 filter, a diode D9 and a resistor R61 are connected in series between the VCC pin and the VB pin of the driver chip U4 in turn, two capacitors C22 and C23 are connected in parallel between the VB pin and the VS pin of the driver chip U4, the VS pin of the driver chip U4 is connected to the V phase line of the fan motor J0, the COM pin of the driver chip U4 is grounded, and the HO pin and the LO pin of the driver chip U4 are respectively connected to the high and low input terminals on the V phase of the fan motor on the IGBT switch module corresponding to the fan motor.

[0039] The HIN pin of the driver chip U5 is connected to the H_DV pin of the microcontroller unit UA1 through a resistor R5, the LIN pin of the driver chip U5 is connected to the L_DW pin of the microcontroller unit UA1 through a resistor R6, and the H_DW pin and the L_DW pin are grounded through capacitors C7 and C8 respectively, the VCC pin of the driver chip U5 is connected to the +15V power supply through a resistor R63, and is grounded through a capacitor C24 at the same time, a diode D10 and a resistor R64 are connected in series between the VCC pin and the VB pin of the driver chip U5 in turn, two capacitors C25 and C26 are connected in parallel between the VB pin and the VS pin of the driver chip U5, the VS pin of the driver chip U5 is connected to the W phase line of the fan motor J0, the COM pin of the driver chip U5 is grounded, and the HO pin and the LO pin of the driver chip U5 are respectively connected to the high and low input terminals on the W phase of the fan motor on the IGBT switch module corresponding to the IGBT switch module.

[0040] The U, V, W three-phase high and low levels output from the driver chip U3, driver chip U4, and driver chip U5 are connected to the IGBT switch module. The IGBT switch module includes field effect tubes Q1, Q2, Q3, Q4, Q5, and Q6, and two field effect tubes are allocated to the three phases U, V, and W of the fan motor respectively.

[0041] like Figure 4As shown, the U phase of the fan motor corresponds to the field effect tubes Q1 and Q2, the source of the field effect tube Q1 is connected to the drain of the field effect tube Q2, and the gate of the field effect tube Q1 is connected to the high-level output end of the driver chip IR2106 corresponding to the U phase of the fan motor through the resistor R11; the protection circuit formed by the reverse-connected diode DO4 and the resistor R10 is connected in parallel at both ends of the resistor R11; the resistor R22 and the capacitor CO1 are connected in parallel between the gate and source of the field effect tube Q1; the drain of the field effect tube Q1 is grounded through the capacitor CO24; the field effect tube Q The gate of the FET Q2 is connected to the low-level output terminal of the driver chip IR2106 corresponding to the fan motor U through the resistor R13; the protection circuit formed by the reverse-connected diode DO5 and the resistor R12 is connected in parallel at both ends of the resistor R13; the resistor R23 and the capacitor CO2 are connected in parallel between the gate and the source of the FET Q2; the source of the FET Q2 is grounded through the series resistor R26 and the resistor R28; the source of the FET Q1 is connected to the U phase line of the fan motor; the current at the source end of the FET Q2 is the U phase DC current signal I_U.

[0042] The V phase of the fan motor corresponds to the field effect tubes Q3 and Q4, the source of the field effect tube Q3 is connected to the drain of the field effect tube Q4, and the gate of the field effect tube Q3 is connected to the high-level output end of the driver chip IR2106 corresponding to the V phase of the fan motor through the resistor R15; the protection circuit formed by the reverse-connected diode DO6 and the resistor R14 is connected in parallel at both ends of the resistor R15; the resistor R24 ​​and the capacitor CO3 are connected in parallel between the gate and source of the field effect tube Q3; the drain of the field effect tube Q3 is connected to the drain of the field effect tube Q1; the field effect tube Q4 The gate is connected to the low-level output terminal of the driver chip IR2106 corresponding to the V phase of the fan motor through the resistor R17; the protection circuit formed by the reverse-connected diode DO7 and the resistor R16 is connected in parallel at both ends of the resistor R17; the resistor R25 and the capacitor CO4 are connected in parallel between the gate and the source of the field effect transistor Q4; the source of the field effect transistor Q4 is grounded through the series resistor R27 and the resistor R28; the source of the field effect transistor Q3 is externally connected to the V phase line of the fan motor; the current at the source end of the field effect transistor Q2 is the V phase DC current signal I_V.

[0043] The W phase of the fan motor corresponds to the field effect tubes Q5 and Q6, the source of the field effect tube Q5 is connected to the drain of the field effect tube Q6, and the gate of the field effect tube Q5 is connected to the high-level output end of the driver chip IR2106 corresponding to the W phase of the fan motor through the resistor R19; the protection circuit formed by the reverse-connected diode DO9 and the resistor R20 is connected in parallel at both ends of the resistor R19; the resistor R26 and the capacitor CO5 are connected in parallel between the gate and source of the field effect tube Q5; the drain of the field effect tube Q5 is connected to the drain of the field effect tube Q1; the field effect The gate of tube Q6 is connected to the low-level output terminal of the driver chip IR2106 corresponding to the fan motor W through the resistor R21; the protection circuit formed by the reverse-connected diode DO9 and the resistor R20 is connected in parallel at both ends of the resistor R21; the resistor R27 and the capacitor CO6 are connected in parallel between the gate and the source of the field effect tube Q6; the source of the field effect tube Q6 is grounded through the resistor R28; the source of the field effect tube Q5 is connected to the W phase line of the fan motor; the current at the source end of the field effect tube Q6 is the W phase DC current signal I_SHUNT.

[0044] The IGBT switch module is connected to the U, V, W three-phase lines of the fan motor JO. At the same time, the signal of the single-chip unit UA1 is converted by the driver chip U3, the driver chip U4, and the driver chip U5 and connected to the input end of the IGBT switch module. According to the three-phase alternating current working in turn, the three-phase U, V, and W of the IGBT switch module are turned on in turn, and the current signals I_U, I_V, and I_SHUNT of each phase are collected and stored in the single-chip unit UA1.

[0045] The current signals I_U and I_V are passed through the internal amplifier of the microcontroller unit UA1 to obtain the DC current signals I_U_AD and I_V_AD. The W-phase DC current signal I_W_AD can be calculated through the DC current signals I_U_AD and I_V_AD. The amplification circuit of the current signals I_U and I_V is the internal amplifier of the microcontroller unit UA1. The two have the same principle, such as Figure 5 As shown, a brief description is given by taking the current signal I_U as an example.

[0046] The current signal I_U is input to the amplifier OPA1_P pin after passing through the resistor R32, and the amplifier OPA1_P pin is connected to the +5V voltage through the resistor R29. The amplifier OPA1_N pin is grounded through the resistor R31, and the capacitor C14 is connected in series between the current signal I_U and the ground terminal, the amplifier OPA1_N pin and the amplifier OPA1_OUT pin are connected in series with the resistor R33, and the amplifier OPA1_OUT pin is connected in series with the resistor R34 and the capacitor C15 to the ground, wherein the connection point between the resistor R34 and the capacitor C15 forms the output end of the DC current signal I_U_AD. In this way, after the current signal I_U is input from the positive pin of the amplifier, the signal is amplified by the differential amplifier, and finally the output of the DC current signal I_U_AD is formed. Similarly, the DC current signal I_V_AD is obtained through the amplifier. According to the internal relationship of the three-phase motor, the DC current signals I_U_AD and I_V_AD of the two phases are known, and the value of the third phase DC current signal I_W_AD can be obtained.

[0047] As a key working module, the IGBT switch module will accumulate a certain amount of heat after working for a long time. Excessive temperature will affect the accuracy of data in the circuit. Therefore, a temperature detection circuit is set on the back of the IGBT switch module. Figure 6 As shown. In order to optimize the temperature control data, in the present embodiment, the temperature detection circuit is on the back of the circuit board where the IGBT switch module is located, and in the central area of ​​the entire IGBT switch module. Specifically, it mainly includes a thermistor R40, one end of which is connected to the +5V voltage through a pull-up resistor R39, and the other end is grounded. The connection end between the thermistor R40 and the pull-up resistor R39 is connected to the ground through a resistor R41 and a capacitor C28 connected in series in sequence. The connection point between the resistor R41 and the capacitor C28 forms a collection signal, where the current value is collected, representing the temperature data. Through the collection and monitoring of this data, it is used to determine whether the voltage on the thermistor R40 is too high, thereby determining whether the heat in the circuit of the IGBT switch module is too high.

[0048] When the utility model is working, the three-phase AC input on the fan motor JO1, the single-chip unit UA1 is connected to the input end of the MOSFET driver module to form a drive signal, the three-phase line of the fan motor JO1 turns on the switch circuit corresponding to the U, V, and W three-phases of the MOSFET driver module, and the U, V, and W three-phase DC current signals I_U, I_V, and I_SHUNT are collected, thereby obtaining the corresponding DC current signals I_U_AD, I_V_AD, and I_W_AD, and finally the power value of the fan motor JO1 can be known.

[0049] The driving signal at the input end of the MOSFET driving module of the utility model is linked with the three-phase DC current signals I_U, I_V, and I_SHUNT of U, V, and W. When the driving signal at the input end of the MOSFET driving module increases, the DC current signal of the three-phase line of the fan motor becomes larger, the power of the fan motor increases, the wind force increases, and the static pressure value in the wind box increases. On the contrary, when it decreases, the power of the fan motor decreases, the wind force weakens, and the static pressure value in the wind box decreases.

[0050] Therefore, when applied to an integrated stove with multiple fans, multiple fans can be set up for use in the same air duct, and each fan is equipped with the control circuit of the utility model, so that multiple fans can be controlled separately, so that multiple fans can work together, so that the static pressure of the entire wind box is not limited by a single motor. And the fans are in an optimized working state, and are dynamically adjusted in real time.

[0051] The above are only specific embodiments of the present utility model. At the same time, all words such as "upper, lower, left, right, middle" involved in the present utility model are for reference only and are not absolutely limiting. Any non-substantial changes made using the present utility model shall be deemed as an infringement of the protection scope of the present utility model.

Claims

1. An integrated stove fan control circuit, characterized in that: include, Single-chip computer unit UA1, MOSFET driving module, IGBT switch module; the input end of the MOSFET driving module is connected to the single-chip computer unit UA1, the output end of the MOSFET driving module is connected to the IGBT switch module, and the three-phase line of the fan motor JO1 is connected to the MOSFET driving module and the IGBT switch module; the single-chip computer unit UA1 drives the IGBT switch module to work through the MOSFET driving module, and the IGBT switch module is turned on in turn according to the alternating signal of the three-phase line of the fan motor JO1, and a DC current signal of the three-phase line of the fan motor JO1 is obtained, and stored in the single-chip computer unit.

2. The integrated stove fan control circuit according to claim 1, characterized in that: The single chip unit UA1 is connected to an overvoltage protection circuit.

3. The integrated stove fan control circuit according to claim 2, characterized in that: The overvoltage protection circuit includes a SMD dual series switching diode, pin 3 of the SMD dual series switching diode is connected to the microcontroller unit power supply pin VBUS_AIN, and the microcontroller unit power supply pin VBUS_AIN is connected to a 310V power supply through a series resistor; pin 1 of the SMD dual series switching diode is grounded, and pin 2 of the SMD dual series switching diode is connected to a 5V power supply.

4. The integrated stove fan control circuit according to claim 2, characterized in that: The overvoltage protection circuit has a single-chip microcomputer unit power supply pin VBUS_AIN that is grounded through filtering by capacitor CP16.

5. The integrated stove fan control circuit according to claim 3, characterized in that: A resistor RP6 is connected between pin 3 and pin 1 of the SMD dual series switching diode.

6. The integrated stove fan control circuit according to claim 1, characterized in that: The MOSFET driving module includes a driving chip IR2106 corresponding to each of the three phases U, V, and W. The HIN pin and LIN housekeeper of the driving chip IR2106 are respectively connected to the high and low level output pins of the three phases U, V, and W of the fan motor on the single-chip unit through resistors. The VCC pin of the driving chip IR2106 is connected to the +15V power supply through a pull-up resistor and is grounded through a capacitor filter. A diode is connected in series between the VCC pin and the VB pin of the driving chip IR2106. and a resistor, two capacitors are connected in parallel between the VB pin and VS pin of the driver chip IR2106, the VS pin of the driver chip IR2106 is externally connected to the three-phase U, V, W of the fan motor, the COM pin of the driver chip IR2106 is grounded, the HO pin and LO pin of the driver chip IR2106 are externally connected to the high and low input terminals on the U, V, W three-phases of the fan motor on the IGBT switch module corresponding to the fan motor; the VS pin of the driver chip IR2106 is connected to the U, V, W three-phase lines of the fan motor.

7. The integrated stove fan control circuit according to claim 1, characterized in that: The IGBT switch module comprises a switch circuit composed of two field effect transistors arranged in correspondence with the three phases U, V and W of the fan motor.

8. The integrated stove fan control circuit according to claim 7, characterized in that: The U phase of the fan motor includes field effect tubes Q1 and Q2, the source of the field effect tube Q1 is connected to the drain of the field effect tube Q2, and the gate of the field effect tube Q1 is connected to the high-level output end of the driver chip IR2106 corresponding to the U phase of the fan motor through a resistor R11; the protection circuit formed by the reverse-connected diode DO4 and the resistor R10 is connected in parallel at both ends of the resistor R11; a resistor R22 and a capacitor CO1 are connected in parallel between the gate and source of the field effect tube Q1; the drain of the field effect tube Q1 is grounded through a capacitor CO24; the field effect tube The gate of Q2 is connected to the low-level output terminal of the driver chip IR2106 corresponding to the fan motor U through the resistor R13; the protection circuit formed by the reverse-connected diode DO5 and the resistor R12 is connected in parallel at both ends of the resistor R13; the resistor R23 and the capacitor CO2 are connected in parallel between the gate and the source of the field effect tube Q2; the source of the field effect tube Q2 is connected to the ground through the series resistor R26 and the resistor R28; the source of the field effect tube Q1 is connected to the U phase line of the fan motor; the current at the source end of the field effect tube Q2 is the U phase current signal I_U; The V phase of the fan motor includes field effect tubes Q3 and Q4, the source of the field effect tube Q3 is connected to the drain of the field effect tube Q4, and the gate of the field effect tube Q3 is connected to the high-level output end of the driver chip IR2106 corresponding to the V phase of the fan motor through a resistor R15; the protection circuit formed by the reverse-connected diode DO6 and the resistor R14 is connected in parallel at both ends of the resistor R15; a resistor R24 ​​and a capacitor CO3 are connected in parallel between the gate and source of the field effect tube Q3; the drain of the field effect tube Q3 is connected to the drain of the field effect tube Q1; the field effect tube The gate of Q4 is connected to the low-level output terminal of the driver chip IR2106 corresponding to the V phase of the fan motor through the resistor R17; the protection circuit formed by the reverse-connected diode DO7 and the resistor R16 is connected in parallel at both ends of the resistor R17; the resistor R25 and the capacitor CO4 are connected in parallel between the gate and the source of the field effect tube Q4; the source of the field effect tube Q4 is connected to the ground through the series resistor R27 and the resistor R28; the source of the field effect tube Q3 is externally connected to the V phase line of the fan motor; the current at the source end of the field effect tube Q2 is the V phase current signal I_V; The W phase of the fan motor includes field effect tubes Q5 and Q6, the source of field effect tube Q5 is connected to the drain of field effect tube Q6, and the gate of field effect tube Q5 is connected to the high level output end of driver chip IR2106 corresponding to the W phase of the fan motor through resistor R19; the protection circuit formed by reverse-connected diode DO9 and resistor R20 is connected in parallel at both ends of resistor R19; resistor R26 and capacitor CO5 are connected in parallel between the gate and source of field effect tube Q5; the drain of field effect tube Q5 is connected to the drain of field effect tube Q1; field The gate of the field effect tube Q6 is connected to the low level output terminal of the driver chip IR2106 corresponding to the fan motor W through the resistor R21; the protection circuit formed by the reverse-connected diode DO9 and the resistor R20 is connected in parallel at both ends of the resistor R21; the resistor R27 and the capacitor CO6 are connected in parallel between the gate and the source of the field effect tube Q6; the source of the field effect tube Q6 is grounded through the resistor R28; the source of the field effect tube Q5 is connected to the W phase line of the fan motor; the current at the source end of the field effect tube Q6 is the W phase current signal I_SHUNT; The current signal I_U and the current signal I_V are amplified inside the single-chip unit UA1 to obtain the fan motor U-phase DC current signal I_U_AD and the fan motor V-phase DC current signal I_V_AD, thereby obtaining the fan motor W-phase DC current signal I_W_AD.

9. The integrated stove fan control circuit according to claim 7, characterized in that: The IGBT switch module is provided with a temperature detection circuit in the center of the area corresponding to the back side of the circuit board.

10. The integrated stove fan control circuit according to claim 9, characterized in that: The temperature detection circuit includes a thermistor R40, one end of which is connected to a +5V voltage through a pull-up resistor R39, and the other end is grounded; the connection end between the thermistor R40 and the pull-up resistor R39 is grounded through a resistor R41 and a capacitor C28 connected in series in sequence.

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