Power mainboard capable of linkage control of four burners

Abstract

The utility model relates to the technical field of electromagnetic oven discloses the power mainboard of four stove heads of linkage control, include: A / B stove switching power supply circuit, A / B stove MCU circuit, A / B stove communication circuit, C / D stove switching power supply circuit, C / D stove MCU circuit, C / D stove communication circuit, A / B stove communication circuit and C / D stove communication circuit communication connection, A stove power board signal acquisition circuit, B stove power board signal acquisition circuit, C stove power board signal acquisition circuit, D stove power board signal acquisition circuit, linkage control 4 stove heads, A, B, C, D four stove heads can also work independently, when 2 or more stove heads work together, left and right two CPUs communicate with each other, monitor the working condition of each stove head, and the power of four stove heads is restricted each other to ensure that the total power is controlled in the safe range, the circuit board is designed as one power mainboard with four stove heads, linkage control four stove heads can make the whole machine more simple, reduce internal wiring, assemble conveniently, improve work efficiency and reduce production cost.

Description

Technical Field

[0001] This utility model relates to the field of induction cooker technology, and more particularly to the field of induction cooker burner control, specifically a power mainboard that can control four burners in a coordinated manner. Background Technology

[0002] An induction cooker is a kitchen appliance that uses the principle of electromagnetic induction to heat food. Inside the induction cooker is a coil that generates an alternating magnetic field when energized. When a magnetically conductive metal pot (such as an iron pot) is placed on the cooktop, the magnetic field generates eddy currents at the bottom of the pot, causing the pot to heat up and thus heating the food.

[0003] A search revealed that patent application number CN201320674638.4 discloses a power board, an induction cooker mainboard, and an induction cooker. The power board includes: a synchronization circuit, the output of which is electrically connected to a control board; and a discharge circuit, the first terminal of which is connected to the output of the synchronization circuit, and the second terminal of which is grounded. This invention improves the safety of the circuitry in an induction cooker when the power board and control board are designed separately. If a circuit break occurs between the power board and control board, the charge inside the filter capacitor in the power board can be released through the discharge circuit.

[0004] Traditional induction cooker power boards, especially those for multi-burner induction cookers, are not convenient for coordinated control of multiple burners. They can only control each burner independently, which is not conducive to monitoring the working status of each individual burner. Therefore, we need to propose a power board that can coordinate and control four burners. Utility Model Content

[0005] The purpose of this invention is to provide a power mainboard capable of controlling four burners in a coordinated manner. Burners A, B, C, and D can also operate independently. When two or more burners work together, the two CPUs communicate with each other to monitor the operation of each burner. The power of the four burners is mutually constrained to ensure the total power is controlled within a safe range. The circuit board is designed as a single power mainboard controlling four burners in a coordinated manner, which simplifies the overall design, reduces internal wiring, facilitates assembly, improves work efficiency, and lowers production costs, thus solving the problems mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a power mainboard capable of controlling four burners in a coordinated manner, comprising:

[0007] A / B furnace switching power supply circuit that provides working power to furnaces A and B;

[0008] A / B furnace MCU circuit for processing signals collected from furnace A and furnace B;

[0009] A / B furnace communication circuit;

[0010] A C / D furnace switching power supply circuit that provides operating power to the C furnace and the D furnace;

[0011] C / D furnace MCU circuit for processing signals collected from C furnace and D furnace;

[0012] C / D furnace communication circuit;

[0013] The communication circuit for furnaces A / B is connected to the communication circuit for furnaces C / D.

[0014] Signal acquisition circuit for furnace A power board used to collect information from furnace A and send it to the MCU circuit of furnaces A and B;

[0015] The power board signal acquisition circuit for furnace B is used to collect information from furnace B and send it to the MCU circuit of furnaces A and B.

[0016] The C furnace power board signal acquisition circuit is used to collect information from the C furnace and send it to the C / D furnace MCU circuit.

[0017] The D furnace power board signal acquisition circuit is used to collect information from the D furnace and send it to the C / D furnace MCU circuit.

[0018] The power board signal acquisition circuits of furnace A and furnace B are electrically connected to the switching power supply circuits of furnaces A and B and the MCU circuits of furnaces A and B. The power board signal acquisition circuits of furnace C and furnace D are electrically connected to the switching power supply circuits of furnaces C and D and the MCU circuits of furnaces C and D.

[0019] The A / B furnace switching power supply circuit is electrically connected to the A / B furnace MCU circuit, the C / D furnace switching power supply circuit is electrically connected to the C / D furnace MCU circuit, and the A / B furnace communication circuit and the C / D furnace communication circuit are both electrically connected to the A / B furnace MCU circuit and the C / D furnace MCU circuit.

[0020] Preferably, the power board signal acquisition circuit of furnace A includes a rectifier BD1 connected to the power supply line. Pin 1 of the rectifier BD1 is connected to an inductor L4, and pin 4 of the rectifier BD1 is connected to a button JJ1. One end of the button JJ1 is connected to buttons PK3 and PK3A connected in parallel. A capacitor C54 is connected between the inductor L4 and the terminals of buttons PK3 and PK3A. The terminals of buttons PK3 and PK3A are also connected to MOSFETs IGBT3 and IGBT3A connected in parallel. A capacitor C51 and a relay REL1 are connected in parallel between the inductor L4 and the terminals of pins 2 of MOSFETs IGBT3 and IGBT3A.

[0021] Preferably, the power board signal acquisition circuit of furnace A further includes operational amplifier U3B and operational amplifier U9D. The two ends of the button PK3 and button PK3A are respectively connected to resistor R183 and resistor R184. Resistor R183 is connected to pin 5 of operational amplifier U3B, and resistor R184 is connected to pin 6 of operational amplifier U3B.

[0022] The operational amplifier U9D has a resistor R172 connected to pin 13. One end of the resistor R172 is connected to transistors Q11 and Q13, which are connected in parallel. The emitter of transistor Q11 and the collector of transistor Q13 are connected to pin 1 of MOSFET IGBT3.

[0023] The emitter of transistor Q11 and the collector of transistor Q13 are also connected to transistor Q15.

[0024] Preferably, the power board signal acquisition circuit of furnace A further includes operational amplifiers U9C, U9B, and U9A connected in parallel. One end of the inductor L4 is connected to resistors R159, R169, R179, R181, R189, and R199 connected in series, as well as resistors R182, R193, R205, and R214 connected in series. Resistor R212 is connected between resistor R199 and pin 9 of operational amplifier U9C, and resistor R214 is connected to pin 8 of operational amplifier U9C.

[0025] One end of the resistor R199 is also connected to resistors R202, R203 and R228, which are connected in series. Pin 4 of the operational amplifier U9B is connected between resistors R202 and R203, and pin 6 of the operational amplifier U9A is connected between resistors R203 and R228.

[0026] Preferably, the A / B furnace switching power supply circuit includes chip U7, chip U12, chip U15, and transformer T1. Pin 2 of chip U7 is connected to pin 8 of transformer T1. A diode D17, a diode D19, a capacitor C53, a resistor R165, and a capacitor EC7 are connected in parallel between pin 8 and pin 5 of transformer T1.

[0027] A diode D22 is connected between pin 1 of transformer T1 and pin 1 of chip U12. A diode DZ1 and a resistor R187 are connected in series between pin 5 of transformer T1 and pin 1 of chip U12. A capacitor EC15 is connected between pin 1 and pin 2 of chip U12. A capacitor C77 and a capacitor EC13 are connected in parallel between pin 2 and pin 3 of chip U12.

[0028] Capacitor EC17 and capacitor C89 are connected in parallel between pin 1 and pin 3 of chip U15, and capacitor EC18 and capacitor C99 are connected in parallel between pin 1 and pin 2 of chip U15.

[0029] Preferably, the A / B furnace MCU circuit includes a chip U17, connectors PAN1 and PAN2 connected to the chip U17, a programming interface CN5, and a connector CN4. It also includes resistors R75 and R78 and a thermistor NTC1 connected in parallel, resistors R76 and R79 and a thermistor NTC2 connected in parallel, and diodes D31, D25, D27, and D29 connected in series.

[0030] Preferably, the A / B furnace communication circuit includes optocouplers U2, U21, U22, and U4 connected to chip U17;

[0031] A resistor R9 is connected between pins 1 and 2 of the optocoupler U2, a resistor R5 is connected to pin 1 of the optocoupler U2, a resistor R7 is connected to pin 4 of the optocoupler U2, and a resistor R3 and a capacitor C3 are connected to the two ends of the resistor R7 respectively.

[0032] A capacitor C107 is connected between pins 3 and 4 of the optocoupler U21, a resistor R253 is connected to pin 4 of the optocoupler U21, and a resistor R272 is connected to pin 1 of the optocoupler U22.

[0033] Resistors R270 and R274 are connected between pin 1 and pin 2 of the optocoupler U22;

[0034] A resistor R23 is connected between pins 1 and 2 of the optocoupler U4, a resistor R177 is connected to pin 1 of the optocoupler U4, a resistor R171 is connected to pin 3 of the optocoupler U4, and a capacitor C7 and a resistor R19 are connected in parallel at one end of the resistor R171.

[0035] The A / B furnace communication circuit also includes an optocoupler U28 and a connector P1 and a connector P3 that are electrically connected.

[0036] Compared with the prior art, the beneficial effects of this utility model are:

[0037] This utility model can control four burners in a coordinated manner. Burners A, B, C, and D can also work independently. When two or more burners work together, the two CPUs on the left and right communicate with each other to monitor the working status of each burner. The power of the four burners is mutually constrained to ensure that the total power is controlled within a safe range. The circuit board is designed as a power mainboard that controls the four burners in a coordinated manner, which makes the whole machine simpler, reduces internal wiring, facilitates assembly, improves work efficiency, and reduces production costs. Attached Figure Description

[0038] Figure 1 This is a circuit diagram of the pre-amplifier signal processing circuit for the power board signal acquisition of furnaces A and B in this utility model.

[0039] Figure 2 This is a circuit diagram of the pre-amplifier signal processing circuit for the power board signal acquisition of furnaces C and D in this utility model.

[0040] Figure 3 This is a circuit diagram of the signal acquisition circuit for the power board of furnace A in this utility model;

[0041] Figure 4 This is a circuit diagram of the signal acquisition circuit for the power board of furnace B of this utility model;

[0042] Figure 5 This is a circuit diagram of the signal acquisition circuit for the C-furnace power board of this utility model;

[0043] Figure 6 This is a circuit diagram of the signal acquisition circuit for the power board of furnace D of this utility model;

[0044] Figure 7 This is the circuit diagram of the A / B furnace switching power supply of this utility model;

[0045] Figure 8 This is the circuit diagram of the A / B furnace MCU circuit of this utility model;

[0046] Figure 9 This is a circuit diagram of the A / B furnace communication circuit of this utility model;

[0047] Figure 10 This is a circuit diagram of the C / D furnace switching power supply circuit of this utility model;

[0048] Figure 11 This is a circuit diagram of the C / D furnace MCU circuit of this utility model;

[0049] Figure 12 This is a circuit diagram of the C / D furnace communication circuit of this utility model;

[0050] Figure 13 This is a system block diagram of the present invention. Detailed Implementation

[0051] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0052] Please see Figure 1-13 This utility model provides a technical solution: a power mainboard capable of controlling four burners in a coordinated manner, comprising:

[0053] A / B furnace switching power supply circuit that provides working power to furnaces A and B;

[0054] A / B furnace MCU circuit for processing signals collected from furnace A and furnace B;

[0055] A / B furnace communication circuit;

[0056] A C / D furnace switching power supply circuit that provides operating power to the C furnace and the D furnace;

[0057] C / D furnace MCU circuit for processing signals collected from C furnace and D furnace;

[0058] C / D furnace communication circuit;

[0059] The communication circuit for furnaces A / B is connected to the communication circuit for furnaces C / D.

[0060] Signal acquisition circuit for furnace A power board used to collect information from furnace A and send it to the MCU circuit of furnaces A and B;

[0061] The power board signal acquisition circuit for furnace B is used to collect information from furnace B and send it to the MCU circuit of furnaces A and B.

[0062] The C furnace power board signal acquisition circuit is used to collect information from the C furnace and send it to the C / D furnace MCU circuit.

[0063] The D furnace power board signal acquisition circuit is used to collect information from the D furnace and send it to the C / D furnace MCU circuit.

[0064] The power board signal acquisition circuits of furnace A and furnace B are electrically connected to the switching power supply circuits of furnaces A and B and the MCU circuits of furnaces A and B. The power board signal acquisition circuits of furnace C and furnace D are electrically connected to the switching power supply circuits of furnaces C and D and the MCU circuits of furnaces C and D.

[0065] The A / B furnace switching power supply circuit is electrically connected to the A / B furnace MCU circuit, the C / D furnace switching power supply circuit is electrically connected to the C / D furnace MCU circuit, and the A / B furnace communication circuit and the C / D furnace communication circuit are both electrically connected to the A / B furnace MCU circuit and the C / D furnace MCU circuit.

[0066] like Figure 1As shown, the signal acquisition circuit of the A furnace power board includes a rectifier BD1 connected to the power line. The rectifier BD1 is used to rectify and filter the signals of the A furnace power board and the B furnace power board. The input side is connected to the mains power through AC_L1 / AC_N1. After being rectified by the bridge rectifier of diodes D4 / D5, the output is a DC pulsating voltage of about 300V. Capacitor C14 completes the preliminary filtering. Resistors R26 and R116 form a voltage divider network for voltage detection. Diode D3 forms a clamping protection circuit to prevent reverse voltage surges.

[0067] Transistor Q7, together with resistors R125 and R126, forms an error amplifier. Sampling resistors R11 and R72 form a voltage divider reference. The +5VA is the main output voltage, which is current-limited by resistor R114. The ±3.3VA voltage is rectified by diodes D9 and D11 to form a bipolar auxiliary power supply.

[0068] like Figure 3 As shown, pin 1 of rectifier BD1 is connected to inductor L4, pin 4 of rectifier BD1 is connected to button JJ1, one end of button JJ1 is connected to buttons PK3 and PK3A in parallel, capacitor C54 is connected between inductor L4 and the terminals of buttons PK3 and PK3A, the terminals of buttons PK3 and PK3A are also connected to MOSFETs IGBT3 and IGBT3A in parallel, capacitor C51 and relay REL1 are connected in parallel between inductor L4 and the terminals of MOSFETs IGBT3 and IGBT3A.

[0069] The power board signal acquisition circuit of furnace A also includes operational amplifier U3B and operational amplifier U9D. The two ends of the button PK3 and button PK3A are respectively connected to resistor R183 and resistor R184. Resistor R183 is connected to pin 5 of operational amplifier U3B, and resistor R184 is connected to pin 6 of operational amplifier U3B.

[0070] The operational amplifier U9D has a resistor R172 connected to pin 13. One end of the resistor R172 is connected to transistors Q11 and Q13, which are connected in parallel. The emitter of transistor Q11 and the collector of transistor Q13 are connected to pin 1 of MOSFET IGBT3.

[0071] The emitter of transistor Q11 and the collector of transistor Q13 are also connected to transistor Q15.

[0072] The power board signal acquisition circuit of furnace A also includes operational amplifiers U9C, U9B, and U9A connected in parallel. One end of the inductor L4 is connected to resistors R159, R169, R179, R181, R189, and R199 connected in series, as well as resistors R182, R193, R205, and R214 connected in series. Resistor R212 is connected between resistor R199 and pin 9 of operational amplifier U9C, and resistor R214 is connected to pin 8 of operational amplifier U9C.

[0073] One end of the resistor R199 is also connected to resistors R202, R203 and R228, which are connected in series. Pin 4 of the operational amplifier U9B is connected between resistors R202 and R203, and pin 6 of the operational amplifier U9A is connected between resistors R203 and R228.

[0074] The IGBT3 / IGBT3A is a composite fully controllable voltage-driven power semiconductor device with high input impedance and low on-state voltage drop. It is used to efficiently control the switching of large currents and is commonly used in power conversion, motor drive and other applications. It can quickly switch circuit states to achieve precise control of loads (such as motors, heaters, etc.).

[0075] Figure 3 In Chinese: A resistor connected in series with a transistor or integrated circuit serves to limit the current in the circuit, preventing excessive current from damaging other components. Through a series resistor network, the input voltage is divided into different voltage levels, providing appropriate bias voltages for other components.

[0076] Capacitors are used to filter out the AC component in a circuit, retaining the DC component to stabilize the output voltage. In power supply circuits, capacitors are used to filter out power supply ripple. In AC circuits, capacitors transmit the AC signal from the preceding circuit to the following circuit while simultaneously isolating the DC component, achieving DC isolation between the preceding and following circuits.

[0077] The circuit diagram of the signal acquisition circuit for the power board of furnace B is as follows: Figure 4 As shown; the circuit diagram of the signal acquisition circuit for the C furnace power board is as follows. Figure 5 As shown; the circuit diagram of the signal acquisition circuit for the power board of furnace D is as follows. Figure 6 As shown;

[0078] like Figure 7 As shown, the A / B furnace switching power supply circuit includes chip U7, chip U12, chip U15, and transformer T1. Pin 2 of chip U7 is connected to pin 8 of transformer T1. A diode D17, a diode D19, a capacitor C53, a resistor R165, and a capacitor EC7 are connected in parallel between pin 8 and pin 5 of transformer T1.

[0079] A diode D22 is connected between pin 1 of transformer T1 and pin 1 of chip U12. A diode DZ1 and a resistor R187 are connected in series between pin 5 of transformer T1 and pin 1 of chip U12. A capacitor EC15 is connected between pin 1 and pin 2 of chip U12. A capacitor C77 and a capacitor EC13 are connected in parallel between pin 2 and pin 3 of chip U12.

[0080] Capacitor EC17 and capacitor C89 are connected in parallel between pin 1 and pin 3 of chip U15, and capacitor EC18 and capacitor C99 are connected in parallel between pin 1 and pin 2 of chip U15.

[0081] Chip U12 is an L7805CV three-terminal regulator with a 5V output. High-frequency / low-frequency filtering is achieved through capacitors C65 and C68, and electrical isolation is achieved through transformer T1. Chip U15 is a CT7803 three-terminal regulator with a 3.3V output. It uses π-type filtering, and a TVS diode is connected in parallel at the output to provide transient protection.

[0082] like Figure 8 As shown, the A / B furnace MCU circuit includes a chip U17, connectors PAN1 and PAN2 connected to the chip U17, a programming interface CN5, and a connector CN4. It also includes resistors R75 and R78 and a thermistor NTC1 connected in parallel, resistors R76 and R79 and a thermistor NTC2 connected in parallel, and diodes D31, D25, D27, and D29 connected in series.

[0083] +5VOUT is filtered by inductor L17 and then supplied to the VBAT (battery powered) and VDD pins of U17. The 3.3VA power supply is decoupled and filtered by C31 / C242 (100nF ceramic capacitor) and then supplied to the MCU main power domain.

[0084] The CAN bus enables high-speed communication via CN4 (CAN_H / L), PA9 (TX) / PA10 (RX) constitutes serial communication, and PA11 / PA12 correspond to USB_DM / DP.

[0085] PB0 / PB1 control the L17 relay coil via pins U17-28 / U17-10, NTC1 is connected to the ADC input channel, and the FA1 indicator light is controlled via pin PA8.

[0086] The NRST pin is connected to VDD via a 10KΩ pull-up resistor, the 8MHz main frequency crystal oscillator (Y1) is connected to OSC_IN / OSC_OUT, and the VBAT pin needs to be connected to a 3V button battery.

[0087] like Figure 9As shown, the A / B furnace communication circuit includes optocouplers U2, U21, U22, and U4 connected to chip U17;

[0088] A resistor R9 is connected between pins 1 and 2 of the optocoupler U2, a resistor R5 is connected to pin 1 of the optocoupler U2, a resistor R7 is connected to pin 4 of the optocoupler U2, and a resistor R3 and a capacitor C3 are connected to the two ends of the resistor R7 respectively.

[0089] A capacitor C107 is connected between pins 3 and 4 of the optocoupler U21, a resistor R253 is connected to pin 4 of the optocoupler U21, and a resistor R272 is connected to pin 1 of the optocoupler U22.

[0090] Resistors R270 and R274 are connected between pin 1 and pin 2 of the optocoupler U22;

[0091] A resistor R23 is connected between pins 1 and 2 of the optocoupler U4, a resistor R177 is connected to pin 1 of the optocoupler U4, a resistor R171 is connected to pin 3 of the optocoupler U4, and a capacitor C7 and a resistor R19 are connected in parallel at one end of the resistor R171.

[0092] The A / B furnace communication circuit also includes an optocoupler U28 and a connector P1 and a connector P3 that are electrically connected.

[0093] Electrical isolation is achieved using a PC817C high-speed optocoupler. The input side (RX terminal) is current-limited by a 4.7K resistor and a 1K pull-up resistor to form a signal receiving circuit. The output side (TXA terminal) is filtered by a 100pF capacitor to ensure signal integrity.

[0094] Uses dual isolated power supplies of +3.3VA and +3.3VB;

[0095] Complete power isolation between the input and output sides is achieved through optocouplers;

[0096] Optocoupler U22 forms a voltage follower, interface P1 adopts a differential signal design, and resistors such as R349 / R317 form a terminating matching network.

[0097] like Figure 2 As shown, this motherboard also includes a rectifier BD2 connected to the power supply line. The rectifier BD2 is used to rectify and filter the power board signals of furnace C and furnace D. The input side is connected to the mains power through AC_L1 / AC_N1. After being rectified by the bridge rectifier of diodes D2 / D7, it outputs a DC pulsating voltage of about 300V. Diodes D2 and D7 form a bridge rectifier circuit to convert AC power into pulsating DC power.

[0098] Capacitor C119 is a high-voltage filter capacitor used to suppress high-frequency noise in the input AC power and protect the subsequent circuitry.

[0099] Diode U13 sets the output voltage (e.g., 3.3V or -3.3V) through voltage divider resistors R51 and R55. Transistor Q4 is controlled by diode U13 to regulate load current or switch circuit states.

[0100] The circuit design of the C / D furnace switching power supply is as follows: Figure 10 As shown, its principle is the same as the circuit design of the A / B furnace switching power supply. The circuit design of the C / D furnace MCU circuit is as follows. Figure 11 As shown, its principle is the same as the circuit design of the A / B furnace MCU circuit. The circuit design of the C / D furnace communication circuit is as follows. Figure 12 As shown, its principle is the same as the circuit design of the A / B furnace communication circuit.

[0101] This device can control four burners in a coordinated manner. Burners A, B, C, and D can also operate independently. When two or more burners work together, the two CPUs communicate with each other to monitor the operation of each burner. The power of the four burners is mutually constrained to ensure that the total power is controlled within a safe range. The circuit board is designed as a single power mainboard controlling four burners in a coordinated manner, which makes the whole machine simpler, reduces internal wiring, facilitates assembly, improves work efficiency, and reduces production costs.

[0102] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A power mainboard capable of controlling four burners in a coordinated manner, characterized in that, include: A / B furnace switching power supply circuit that provides working power to furnaces A and B; A / B furnace MCU circuit for processing signals collected from furnace A and furnace B; A / B furnace communication circuit; A C / D furnace switching power supply circuit that provides operating power to the C furnace and the D furnace; C / D furnace MCU circuit for processing signals collected from C furnace and D furnace; C / D furnace communication circuit; The communication circuit for furnaces A / B is connected to the communication circuit for furnaces C / D. Signal acquisition circuit for furnace A power board used to collect information from furnace A and send it to the MCU circuit of furnaces A and B; The power board signal acquisition circuit for furnace B is used to collect information from furnace B and send it to the MCU circuit of furnaces A and B. The C furnace power board signal acquisition circuit is used to collect information from the C furnace and send it to the C / D furnace MCU circuit. The D furnace power board signal acquisition circuit is used to collect information from the D furnace and send it to the C / D furnace MCU circuit. The power board signal acquisition circuits of furnace A and furnace B are electrically connected to the switching power supply circuits of furnaces A and B and the MCU circuits of furnaces A and B. The power board signal acquisition circuits of furnace C and furnace D are electrically connected to the switching power supply circuits of furnaces C and D and the MCU circuits of furnaces C and D. The A / B furnace switching power supply circuit is electrically connected to the A / B furnace MCU circuit, the C / D furnace switching power supply circuit is electrically connected to the C / D furnace MCU circuit, and the A / B furnace communication circuit and the C / D furnace communication circuit are both electrically connected to the A / B furnace MCU circuit and the C / D furnace MCU circuit.

2. The power mainboard for controlling four burners in linkage according to claim 1, characterized in that: The power board signal acquisition circuit of furnace A includes a rectifier BD1 connected to the power supply line. Pin 1 of the rectifier BD1 is connected to an inductor L4, and pin 4 of the rectifier BD1 is connected to a button JJ1. One end of the button JJ1 is connected to buttons PK3 and PK3A, which are connected in parallel. A capacitor C54 is connected between the inductor L4 and the terminals of buttons PK3 and PK3A. The terminals of buttons PK3 and PK3A are also connected to MOSFETs IGBT3 and IGBT3A, which are connected in parallel. A capacitor C51 and a relay REL1 are connected in parallel between the inductor L4 and the terminals of pins 2 of MOSFETs IGBT3 and IGBT3A.

3. The power mainboard for linkage control of four burners according to claim 2, characterized in that: The power board signal acquisition circuit of furnace A also includes operational amplifier U3B and operational amplifier U9D. The two ends of the button PK3 and button PK3A are respectively connected to resistor R183 and resistor R184. Resistor R183 is connected to pin 5 of operational amplifier U3B, and resistor R184 is connected to pin 6 of operational amplifier U3B. The operational amplifier U9D has a resistor R172 connected to pin 13. One end of the resistor R172 is connected to transistors Q11 and Q13, which are connected in parallel. The emitter of transistor Q11 and the collector of transistor Q13 are connected to pin 1 of MOSFET IGBT3. The emitter of transistor Q11 and the collector of transistor Q13 are also connected to transistor Q15.

4. The power mainboard for linkage control of four burners according to claim 3, characterized in that: The power board signal acquisition circuit of furnace A also includes operational amplifiers U9C, U9B, and U9A connected in parallel. One end of the inductor L4 is connected to resistors R159, R169, R179, R181, R189, and R199 connected in series, as well as resistors R182, R193, R205, and R214 connected in series. Resistor R212 is connected between resistor R199 and pin 9 of operational amplifier U9C, and resistor R214 is connected to pin 8 of operational amplifier U9C. One end of the resistor R199 is also connected to resistors R202, R203 and R228, which are connected in series. Pin 4 of the operational amplifier U9B is connected between resistors R202 and R203, and pin 6 of the operational amplifier U9A is connected between resistors R203 and R228.

5. The power mainboard for linkage control of four burners according to claim 4, characterized in that: The A / B furnace switching power supply circuit includes chip U7, chip U12, chip U15, and transformer T1. Pin 2 of chip U7 is connected to pin 8 of transformer T1. A diode D17, a diode D19, a capacitor C53, a resistor R165, and a capacitor EC7 are connected in parallel between pin 8 and pin 5 of transformer T1. A diode D22 is connected between pin 1 of transformer T1 and pin 1 of chip U12. A diode DZ1 and a resistor R187 are connected in series between pin 5 of transformer T1 and pin 1 of chip U12. A capacitor EC15 is connected between pin 1 and pin 2 of chip U12. A capacitor C77 and a capacitor EC13 are connected in parallel between pin 2 and pin 3 of chip U12. Capacitor EC17 and capacitor C89 are connected in parallel between pin 1 and pin 3 of chip U15, and capacitor EC18 and capacitor C99 are connected in parallel between pin 1 and pin 2 of chip U15.

6. The power mainboard for linkage control of four burners according to claim 5, characterized in that: The A / B furnace MCU circuit includes a chip U17, connectors PAN1 and PAN2 connected to the chip U17, a programming interface CN5, and connector CN4. It also includes resistors R75 and R78 and a thermistor NTC1 connected in parallel, resistors R76 and R79 and a thermistor NTC2 connected in parallel, and diodes D31, D25, D27, and D29 connected in series.

7. The power mainboard for linkage control of four burners according to claim 6, characterized in that: The A / B furnace communication circuit includes optocouplers U2, U21, U22, and U4, which are connected to chip U17. A resistor R9 is connected between pins 1 and 2 of the optocoupler U2, a resistor R5 is connected to pin 1 of the optocoupler U2, a resistor R7 is connected to pin 4 of the optocoupler U2, and a resistor R3 and a capacitor C3 are connected to the two ends of the resistor R7 respectively. A capacitor C107 is connected between pins 3 and 4 of the optocoupler U21, a resistor R253 is connected to pin 4 of the optocoupler U21, and a resistor R272 is connected to pin 1 of the optocoupler U22. Resistors R270 and R274 are connected between pin 1 and pin 2 of the optocoupler U22; A resistor R23 is connected between pins 1 and 2 of the optocoupler U4, a resistor R177 is connected to pin 1 of the optocoupler U4, a resistor R171 is connected to pin 3 of the optocoupler U4, and a capacitor C7 and a resistor R19 are connected in parallel at one end of the resistor R171. The A / B furnace communication circuit also includes an optocoupler U28 and a connector P1 and a connector P3 that are electrically connected.

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