Multi-head half-bridge induction cooker power and temperature control system and induction cooker

Abstract

The invention relates to the field of electrical technology, and discloses a multi-head half-bridge induction cooker power and temperature control system and an induction cooker, the multi-head half-bridge induction cooker power and temperature control system comprises a voltage detection circuit, a current detection circuit, a furnace temperature detection circuit, a half-bridge LC series resonance circuit and a microcontroller, the microcontroller is connected with the voltage detection circuit, the current detection circuit and the furnace temperature detection circuit, the current detection circuit is connected in series in the half-bridge LC series resonance circuit, the current detection circuit converts current into voltage and outputs the voltage to the microcontroller, the collector of the first insulated gate bipolar transistor is connected with the inductor, the emitter of the first insulated gate bipolar transistor is connected with the collector of the second insulated gate bipolar transistor, and the emitter of the second insulated gate bipolar transistor is connected with the inductor. The base electrode of the first insulated gate bipolar transistor is connected with an eighth resistor and a first diode, and the base electrode of the second insulated gate bipolar transistor is connected with a ninth resistor and a second diode. The invention has the characteristics of good power and temperature control.

Description

Technical Field

[0001] The present invention relates to the field of electrical technology, and in particular to a multi-head half-bridge induction cooker power and temperature control system and an induction cooker. Background Art

[0002] With the continuous advancement of consumption upgrades and consumers' pursuit of a higher cooking experience, the use of induction cookers has shown an upward trend. Induction cookers not only meet the needs of quick stir-frying, but also enable adjustable heat for delicate stewing and other operations. However, the multi-burner induction cookers currently on the market have shortcomings in power and temperature control, making it difficult to meet the requirements for precise control. Traditional induction cookers generally do not have pot temperature detection. Even if some induction cookers do have temperature detection functions, the detection has disadvantages such as large pot temperature errors and slow response. This cannot reflect the temperature changes of the pot in a timely and accurate manner, resulting in slow heating or overheating of the induction cooker, which cannot meet the user's demand for delicate cooking. At the same time, it also increases energy consumption and wastes electricity.

[0003] Therefore, how to provide a multi-head half-bridge induction cooker power and temperature control system and an induction cooker is a technical problem that those skilled in the art urgently need to solve. Summary of the Invention

[0004] In view of this, the present invention proposes a multi-head half-bridge induction cooker power and temperature control system and an induction cooker, aiming to solve the problem that the multi-head induction cooker cannot output power accurately and cannot accurately and quickly control the temperature of the pots.

[0005] In one aspect, the present invention provides a power and temperature control system for a multi-burner half-bridge induction cooker, comprising: Voltage detection circuit, current detection circuit, furnace temperature detection circuit, half-bridge LC series resonant circuit and microcontroller; The microcontroller is connected to the voltage detection circuit, the current detection circuit and the furnace temperature detection circuit, the current detection circuit is connected in series with the half-bridge LC series resonant circuit, and the current detection circuit converts the current into a voltage and outputs it to the microcontroller; The half-bridge LC series resonant circuit includes an inductor, a first capacitor, a second capacitor, a third capacitor, a fourth capacitor, a fifth capacitor, a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor, a ninth resistor, a first interface, a second interface, a first insulated gate bipolar transistor, a second insulated gate bipolar transistor, a first diode, and a second diode; The first resistor, the second resistor and the third resistor are connected in series, one end of the third resistor is grounded, the fourth resistor and the fifth resistor are connected in series, the sixth resistor and the seventh resistor are connected in series, the eighth resistor and the first diode are connected in series, and the ninth resistor and the second diode are connected in series; One end of the first capacitor is connected to the inductor, and the other end of the first capacitor is grounded; the second capacitor is connected to one end of the third capacitor and the second interface, and the other end of the third capacitor is grounded; the fourth capacitor is connected to one end of the fifth capacitor and the first interface, and the other end of the fifth capacitor is grounded; The collector of the first insulated gate bipolar transistor is connected to the inductor, the emitter of the first insulated gate bipolar transistor is connected to the collector of the second insulated gate bipolar transistor, the emitter of the second insulated gate bipolar transistor is grounded, the base of the first insulated gate bipolar transistor is connected to the eighth resistor and the first diode, and the base of the second insulated gate bipolar transistor is connected to the ninth resistor and the second diode.

[0006] Furthermore, the voltage detection circuit includes: a voltage input port, a tenth resistor, an eleventh resistor, a twelfth resistor, a thirteenth resistor, and a fourteenth resistor; The voltage input port is used to provide an input voltage, and the voltage input port is connected in series with the eleventh resistor, the twelfth resistor, the thirteenth resistor, and the fourteenth resistor and then grounded; The tenth resistor is connected to a connection node between the thirteenth resistor and the fourteenth resistor.

[0007] Furthermore, the voltage detection circuit further includes: a sixth capacitor, a third diode, a DC conversion port, and a first power supply voltage; One end of the sixth capacitor is connected to the tenth resistor and the DC conversion port, and the other end of the sixth capacitor is grounded; An anode of the third diode is connected to the tenth resistor and the DC conversion port, and a cathode of the third diode is connected to the first power supply voltage.

[0008] Furthermore, the current detection circuit includes: a current detection input port, a seventh capacitor, and a fifteenth resistor; One end of the seventh capacitor is connected to the current detection input port, and the other end of the seventh capacitor is grounded; The current detection input port is connected to the fifteenth resistor.

[0009] Furthermore, the current detection circuit further includes: an eighth capacitor, a ninth capacitor, a second power supply voltage and a current sensor; The GND pin of the current sensor is grounded; The NC pin of the current sensor is connected to one end of the eighth capacitor, and the other end of the eighth capacitor is grounded; The VOUT pin of the current sensor is connected to the fifteenth resistor, and the VOUT pin converts the current into a voltage and outputs the voltage to the microcontroller; The VCC pin of the current sensor and the second power supply voltage are connected to one end of the ninth capacitor, and the other end of the ninth capacitor is grounded.

[0010] Furthermore, the current detection circuit further includes: DC power input port; The IP+1 pin and the IP+2 pin of the current sensor are connected to the DC power input port; The IP-1 pin and the IP-2 pin of the current sensor are connected to the half-bridge LC series resonant circuit.

[0011] Furthermore, the furnace temperature detection circuit includes: a temperature sensor, a sixteenth resistor, a tenth capacitor, and a third power supply voltage; Pin 1 of the temperature sensor is connected to the third power supply voltage and the tenth capacitor; Pin 2 of the temperature sensor is connected to one end of the sixteenth resistor, and the other end of the sixteenth resistor is grounded.

[0012] Furthermore, the furnace temperature detection circuit further includes: a seventeenth resistor, an eighteenth resistor, a nineteenth resistor, a twentieth resistor, a twenty-first resistor, an eleventh capacitor, a transistor, a temperature input port, and a temperature switching port; One end of the seventeenth resistor is connected to the tenth capacitor, the other end of the seventeenth resistor is connected to the base of the transistor, and the emitter of the transistor is grounded; One end of the eighteenth resistor is connected to pin 2 of the temperature sensor, and the other end of the eighteenth resistor is connected to one end of the nineteenth resistor; The other end of the nineteenth resistor is connected to the temperature input port and one end of the eleventh capacitor, and the end of the eleventh capacitor away from the nineteenth resistor is grounded; One end of the 20th resistor is connected to the collector of the transistor, and the other end of the 20th resistor is grounded; One end of the twenty-first resistor is connected to the collector of the transistor, and the other end of the twenty-first resistor is connected to the temperature switching port.

[0013] Furthermore, the power and temperature control system for a multi-head half-bridge induction cooker further includes: The PA0-WKUP1 pin of the microcontroller is connected to the DC conversion port; The PB3 pin of the microcontroller is connected to the current detection input port; The PA4 pin of the microcontroller is connected to the temperature input port; The PA11 pin of the microcontroller is connected to the temperature switching port; The microcontroller is used for calculating power or other parameters.

[0014] Compared with the prior art, the beneficial effects of the present invention are that: the voltage detection circuit, the current detection circuit, the oven temperature detection circuit, the half-bridge LC series resonant circuit and the microcontroller work in coordination, and the microcontroller controls the operating frequency, duty cycle and other parameters of the first insulated gate bipolar transistor and the second insulated gate bipolar transistor in the half-bridge LC series resonant circuit by integrating information such as voltage, current and oven temperature, thereby further controlling the temperature and power of the multi-head induction cooker, achieving precise control of cooking temperature and power, thereby reducing the overall energy consumption of the multi-head induction cooker, effectively avoiding problems such as insufficient heating, slow heating and excessive heating, and enabling the induction cooker to meet the heating requirements of the user.

[0015] On the other hand, the present application also provides an induction cooker for applying the above-mentioned multi-head half-bridge induction cooker power and temperature control system, comprising: An induction cooker body, comprising a glass plate and a base; The glass plate is embedded in the base, the glass plate is provided with a first groove, the base is provided with a second groove, a temperature probe is set in the first groove, the top of the temperature probe passes through the glass plate, and the second groove is tightly fitted with the temperature probe.

[0016] It is understandable that the above-mentioned multi-head half-bridge induction cooker power and temperature control system and induction cooker have the same beneficial effects, which will not be described in detail here. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiment below. The accompanying drawings are for illustration purposes only and are not to be considered as limiting the present invention. The same reference symbols are used throughout the drawings to represent the same components. In the drawings: Figure 1 A circuit schematic diagram of a half-bridge LC series resonant circuit provided by an embodiment of the present invention; Figure 2 A circuit schematic diagram of a voltage detection circuit provided by an embodiment of the present invention; Figure 3 A circuit schematic diagram of a current detection circuit provided by an embodiment of the present invention; Figure 4 A circuit schematic diagram of a furnace temperature detection circuit provided by an embodiment of the present invention; Figure 5 A schematic diagram of a microcontroller provided in an embodiment of the present invention; Figure 6 A schematic structural diagram of an induction cooker provided by an embodiment of the present invention; Figure 7 A schematic cross-sectional view of an induction cooker provided by an embodiment of the present invention; Figure 8 This is a partial enlarged schematic diagram of point A provided in an embodiment of the present invention.

[0018] In the figure: 1, induction cooker body; 10, glass plate; 11, base; 20, temperature probe; 100, first groove; 110, second groove. DETAILED DESCRIPTION

[0019] Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although exemplary embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided to enable a more thorough understanding of the present disclosure and to fully convey the scope of the present disclosure to those skilled in the art. It should be noted that, unless there is a conflict, the embodiments of the present disclosure and the features in the embodiments can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in conjunction with the embodiments.

[0020] See Figure 1-5As shown, in some embodiments of the present application, a multi-head half-bridge induction cooker power and temperature control system includes: a voltage detection circuit, a current detection circuit, an oven temperature detection circuit, a half-bridge LC series resonant circuit and a microcontroller, the microcontroller is connected to the voltage detection circuit, the current detection circuit and the oven temperature detection circuit, the current detection circuit is connected to the half-bridge LC series resonant circuit, the current detection circuit is connected in series in the half-bridge LC series resonant circuit, the current detection circuit converts the current into a voltage and outputs it to the microcontroller, the half-bridge LC series resonant circuit includes an inductor LB1, a first capacitor C1, a second capacitor C2, a third capacitor C3, a fourth capacitor C4, a fifth capacitor C5, a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, an eighth resistor R8, a ninth resistor R9, a first interface J1, a second interface J2, a first insulated gate bipolar transistor VT1, a second insulated gate bipolar transistor VT2, a first diode D1 and a second diode D2, a first resistor R1, a second resistor R2 The fourth resistor R4 and the fifth resistor R5 are connected in series, the sixth resistor R6 and the seventh resistor R7 are connected in series, the eighth resistor R8 and the first diode D1 are connected in series, the ninth resistor R9 and the second diode D2 are connected in series, one end of the first capacitor C1 is connected to the inductor LB1, the other end of the first capacitor C1 is grounded, the second capacitor C2 is connected to one end of the third capacitor C3 and the second interface J2, the other end of the third capacitor C3 is grounded, the fourth capacitor C4 is connected to one end of the fifth capacitor C5 and the first interface J1, the other end of the fifth capacitor C5 is grounded, the collector C of the first insulated gate bipolar transistor VT1 is connected to the inductor LB1, the emitter E of the first insulated gate bipolar transistor VT1 is connected to the collector C of the second insulated gate bipolar transistor VT2, the emitter E of the second insulated gate bipolar transistor VT2 is grounded, the base G of the first insulated gate bipolar transistor VT1 is connected to the eighth resistor R8 and the first diode D1, and the base G of the second insulated gate bipolar transistor VT2 is connected to the ninth resistor R9 and the second diode D2.

[0021] Specifically, a current detection circuit is connected to a half-bridge LC series resonant circuit. The current detection circuit converts current into voltage and outputs it to a microcontroller. When voltage is connected to DC_BUS1, inductor LB1 suppresses sudden current changes and smoothes the current, thereby stabilizing the connected voltage. The microcontroller is connected to the voltage detection circuit, current detection circuit, and oven temperature detection circuit. As a central component, the microcontroller processes the detection results of these circuits, thereby precisely controlling the operating state of the half-bridge LC series resonant circuit. The base G of a first insulated-gate bipolar transistor VT1 is connected to an eighth resistor R8 and a first diode D1, while the base G of a second insulated-gate bipolar transistor VT2 is connected to a ninth resistor R9 and a second diode D2. By controlling the base G current of the first insulated-gate bipolar transistor VT1 via the eighth resistor R8 and the base G current of the second insulated-gate bipolar transistor VT2 via the ninth resistor R9, parameters such as the switching frequency and duty cycle of the first and second insulated-gate bipolar transistors VT1 and VT2 can be controlled, thereby improving the reliability and stability of the power and temperature control of the multi-burner induction cooker. One end of the first capacitor C1 is connected to the inductor LB1, and the other end of the first capacitor C1 is grounded. The first capacitor C1 plays the role of filtering and energy storage. The second capacitor C2, the third capacitor C3, the fourth capacitor C4 and the fifth capacitor C5 respectively form different capacitor connection structures, and cooperate with the inductor LB1 to form an LC series resonant circuit. The LC series resonant circuit can produce a certain resonance, so that the current and voltage in the circuit reach a specific amplitude and phase relationship, further controlling the temperature and power of the multi-burner induction cooker.

[0022] It can be understood that in this embodiment, the first interface J1 and the second interface J2 represent an independent heating area in the multi-head induction cooker, the first interface J1 and the second interface J2 are connected to the heating coil, and each independent heating area adopts a voltage detection circuit, a current detection circuit, an oven temperature detection circuit and a half-bridge LC series resonant circuit, and each independent heating area is controlled by a microcontroller. The first insulated gate bipolar transistor VT1 and the second insulated gate bipolar transistor VT2 form a half-bridge structure. The collector C of the first insulated gate bipolar transistor VT1 is connected to the inductor LB1, and the emitter E is connected to the collector C of the second insulated gate bipolar transistor VT2. The emitter E of the second insulated gate bipolar transistor VT2 is grounded. Under the action of the eighth resistor R8 and the ninth resistor R9, the two insulated gate bipolar transistors are alternately turned on and off, thereby generating an alternating magnetic field to achieve heating of the multi-burner induction cooker. The microcontroller controls the working state of the first insulated gate bipolar transistor VT1 and the second insulated gate bipolar transistor VT2 in the half-bridge LC series resonant circuit by integrating information such as voltage, current and oven temperature, thereby achieving precise control of cooking temperature and power, thereby reducing the overall energy consumption of the multi-burner induction cooker and thus extending the service life of the multi-burner induction cooker.

[0023] In some embodiments of the present application, a voltage detection circuit includes: a voltage input port ACL, a tenth resistor R10, an eleventh resistor R11, a twelfth resistor R12, a thirteenth resistor R13, and a fourteenth resistor R14. The voltage input port ACL is used to provide an input voltage. The voltage input port ACL is connected in series to the eleventh resistor R11, the twelfth resistor R12, the thirteenth resistor R13, and the fourteenth resistor R14 and then to ground. The tenth resistor R10 is connected to a connection node between the thirteenth resistor R13 and the fourteenth resistor R14.

[0024] In some embodiments of the present application, the voltage detection circuit further includes: a sixth capacitor C6, a third diode D3, a DC conversion port DC_AD and a first power supply voltage VCC1, one end of the sixth capacitor C6 is connected to the tenth resistor R10 and the DC conversion port DC_AD, the other end of the sixth capacitor C6 is grounded, the anode of the third diode D3 is connected to the tenth resistor R10 and the DC conversion port DC_AD, and the cathode of the third diode D3 is connected to the first power supply voltage VCC1.

[0025] Specifically, the voltage input port ACL is connected to the voltage to be detected, the eleventh resistor R11, the twelfth resistor R12, the thirteenth resistor R13 and the fourteenth resistor R14 are connected in series, and the input voltage is proportionally reduced according to the voltage division of the series resistors. The tenth resistor R10 is connected to the connection node of the thirteenth resistor R13 and the fourteenth resistor R14, which plays a role in buffering and further adjusting the signal. The characteristics of the sixth capacitor C6 are used to filter the voltage signal to remove the high-frequency noise therein, so that the voltage signal output to the DC conversion port DC_AD is smoother and more stable, thereby improving the accuracy and stability of the voltage detection circuit, and the stable voltage The signal helps the microcontroller accurately collect and analyze voltage data, thereby achieving control of the power and temperature of the multi-burner induction cooker. The anode of the third diode D3 is connected to the tenth resistor R10 and the DC conversion port DC_AD, and the cathode of the third diode D3 is connected to the first power supply voltage VCC1. When the voltage of the DC conversion port DC_AD increases and exceeds the first power supply voltage VCC1 plus the conduction voltage drop of the third diode D3, the third diode D3 is turned on to clamp the excessive voltage, thereby preventing the excessive voltage from damaging the pins in the microcontroller, enhancing the reliability and stability of the voltage detection circuit, and improving the safety and stability of the entire system.

[0026] In some embodiments of the present application, the current detection circuit includes: a current detection input port POT1_I, a seventh capacitor C7 and a fifteenth resistor R15, one end of the seventh capacitor C7 is connected to the current detection input port POT1_I, the other end of the seventh capacitor C7 is grounded, and the current detection input port POT1_I is connected to the fifteenth resistor R15.

[0027] In some embodiments of the present application, the current detection circuit also includes: an eighth capacitor C8, a ninth capacitor C9, a second power supply voltage VCC2 and a current sensor Sensor, the GND pin of the current sensor Sensor is grounded, the NC pin of the current sensor Sensor is connected to one end of the eighth capacitor C8, the other end of the eighth capacitor C8 is grounded, the VOUT pin of the current sensor Sensor is connected to the fifteenth resistor R15, the VOUT pin converts the current into voltage and outputs it to the microcontroller, the VCC pin of the current sensor Sensor and the second power supply voltage VCC2 are connected to one end of the ninth capacitor C9, and the other end of the ninth capacitor C9 is grounded.

[0028] In some embodiments of the present application, the current detection circuit also includes: a DC power input port DC_BUS, the IP+1 pin and IP+2 pin of the current sensor Sensor are connected to the DC power input port DC_BUS, and the IP-1 pin and IP-2 pin of the current sensor Sensor are connected to a half-bridge LC series resonant circuit.

[0029] Specifically, the current detection input port POT1_I is used to access the signal of the microcontroller. The seventh capacitor C7 plays the role of signal filtering, which is used to filter out high-frequency noise in the signal, thereby reducing interference to subsequent circuits. The current sensor Sensor is a 30A current sensor. The DC power input port DC_BUS transmits current to the current sensor Sensor. The current flows into the current sensor Sensor through the IP+1 and IP+2 pins and flows out from the IP-1 and IP-2 pins. The VOUT pin of the current sensor Sensor can convert the current into voltage and output it to the microcontroller, laying a data foundation for subsequent microcontroller calculations. The fifteenth resistor R15 is connected to the VOUT pin of the current sensor Sensor, and plays the role of adjusting the amplitude of the output voltage. The eighth capacitor C8 and the ninth capacitor C9 are respectively connected to the NC pin and VCC pin of the current sensor Sensor and are grounded. The eighth capacitor C8 filters out the noise in the output signal of the current sensor Sensor, and the ninth capacitor C9 filters the current sensor Sensor to reduce the impact of power supply fluctuations on the operation of the current sensor Sensor, ensuring the stability and accuracy of the output voltage of the current sensor Sensor. The current sensor Sensor converts the current into voltage, and the signal amplitude is adjusted by the resistor and the filtering processing of the capacitor is combined to accurately detect the current in the circuit and convert it into a stable voltage output to the subsequent circuit (half-bridge LC series resonant circuit), providing a reliable current basis for the precise control of the system. Through the filtering effect of multiple capacitors, the high-frequency noise and power supply fluctuations in the circuit are effectively suppressed. Interference factors such as, so that the current detection circuit can work stably in a complex electromagnetic environment, and the anti-interference ability and reliability of the current detection circuit are improved.

[0030] In some embodiments of the present application, the furnace temperature detection circuit includes: a temperature sensor CON1, a sixteenth resistor R16, a tenth capacitor C10 and a third power supply voltage VCC3, pin 1 of the temperature sensor CON1 is connected to the third power supply voltage VCC3 and the tenth capacitor C10, pin 2 of the temperature sensor CON1 is connected to one end of the sixteenth resistor R16, and the other end of the sixteenth resistor R16 is grounded.

[0031] In some embodiments of the present application, the furnace temperature detection circuit further includes: a seventeenth resistor R17, an eighteenth resistor R18, a nineteenth resistor R19, a twentieth resistor R20, a twenty-first resistor R21, an eleventh capacitor C11, a transistor Q1, a temperature input port POT1_NTC, and a temperature switching port NTC1_SW, one end of the seventeenth resistor R17 is connected to the tenth capacitor C10, the other end of the seventeenth resistor R17 is connected to the base of the transistor Q1, the emitter of the transistor Q1 is grounded, and one end of the eighteenth resistor R18 is connected to the temperature sensor CO Pin 2 of N1, the other end of the eighteenth resistor R18 is connected to one end of the nineteenth resistor R19, the other end of the nineteenth resistor R19 is connected to the temperature input port POT1_NTC and one end of the eleventh capacitor C11, the end of the eleventh capacitor C11 away from the nineteenth resistor R19 is grounded, one end of the twentieth resistor R20 is connected to the collector of the transistor Q1, the other end of the twentieth resistor R20 is grounded, one end of the twenty-first resistor R21 is connected to the collector of the transistor Q1, and the other end of the twenty-first resistor R21 is connected to the temperature switching port NTC1_SW.

[0032] Specifically, pin 1 of the temperature sensor CON1 is connected to the third power supply voltage VCC3 and is filtered by the tenth capacitor C10, thereby stabilizing the third power supply voltage VCC3 and ensuring the working stability of the temperature sensor CON1. ​​Pin 2 of the temperature sensor CON1 is connected to one end of the sixteenth resistor R16, and the other end of the sixteenth resistor R16 is grounded. When the temperature changes, the resistance of the temperature sensor CON1 will change, causing the voltage of pin 2 to change accordingly, thereby realizing temperature-to-voltage conversion. The model of the transistor Q1 in this embodiment is MMBT3904, and its voltage turn-on threshold is 0.6-0.7V. When temperature fluctuations cause the voltage to exceed the threshold at which transistor Q1 turns on, transistor Q1 begins operating. Its base converts the voltage signal into a current signal, and this current signal increases as the temperature rises. Due to the wide temperature range of the pot, from 0°C to 200°C, transistor Q1's characteristics prevent it from turning off below 80°C and turning on above 80°C. This keeps the converted voltage around 0.5VCC throughout the entire temperature range, improving the accuracy and stability of temperature sampling. Resistors R18 and R19 further divide the voltage, while capacitor C11 filters out high-frequency noise, ensuring that the temperature input port POT1_NTC outputs a smooth and stable signal, enhancing the reliability and stability of temperature detection.

[0033] It should be understood that the temperature sensor CON1 in this embodiment is a high-temperature NTC (0°C-260°C) sensor with a 2% accuracy, and is placed in close proximity to the bottom of the cookware. Transistor Q1 is used for amplification, improving the sensitivity and real-time performance of temperature detection. Compared to traditional temperature control solutions, this allows for timely response to changes in the cookware's temperature, enhancing the reliability of temperature detection in each heating zone of the multi-burner induction cooker. This effectively controls temperature and power fluctuations, preventing localized overheating or overcooling. For example, if a heating zone detects a slow temperature rise, signals from the temperature switching port NTC1_SW and the temperature input port POT1_NTC cause the microcontroller to control a half-bridge LC series resonant circuit to increase power to that zone, achieving temperature balance across the heating zones and avoiding power waste, thereby reducing overall energy consumption. This also reduces the impact of temperature fluctuations on circuit components, extending the service life of the multi-burner induction cooker's components.

[0034] In some embodiments of the present application, the power and temperature control system for a multi-head half-bridge induction cooker also includes: the PA0-WKUP1 pin of the microcontroller is connected to the DC conversion port DC_AD, the PB3 pin of the microcontroller is connected to the current detection input port POT1_I, the PA4 pin of the microcontroller is connected to the temperature input port POT1_NTC, and the PA11 pin of the microcontroller is connected to the temperature switching port NTC1_SW.

[0035] In some embodiments of the present application, a microcontroller is used to calculate power or other parameters.

[0036] Specifically, by connecting the microcontroller's pins to the ports of the voltage detection circuit, current detection circuit, and furnace temperature detection circuit, the microcontroller converts the voltage detection circuit to calculate the effective value of the input voltage V1 (to determine the power), with a detection voltage range of 180V-260V and a detection accuracy of ±2%. The voltage zero point t1 is also marked. The microcontroller also converts the current detection circuit to calculate the effective value of the current A1 during the heating operation of the furnace head (a heating area), with a detection current range of 0-16A. The detection accuracy is ±2%, and the current zero point t2 is also marked. This allows the power phase φ and power factor η of the furnace head to be determined when the furnace head is operating. φ = (t2-t1) / T*360° (T is the period of the AC power supply), η = cosinφ, and ultimately calculates the furnace head input power P, P = V1*A1*η. By sampling and detecting the voltage and current (the sampling period is 1kHz), and by varying the frequency (20-70kHz) and duty cycle of the first insulated gate bipolar transistor VT1 and the second insulated gate bipolar transistor VT2 in the half-bridge LC series resonant circuit, the continuous input power of each burner can be accurately controlled to be 100-3500W. The microcontroller comprehensively processes signals such as voltage, current and temperature, avoiding energy waste caused by unreasonable power distribution and achieving precise control of the power and temperature of each burner.

[0037] In summary, the beneficial effects of the present invention are: the voltage detection circuit, the current detection circuit, the oven temperature detection circuit, the half-bridge LC series resonant circuit and the microcontroller work together, and the microcontroller controls the operating frequency, duty cycle and other parameters of the first insulated gate bipolar transistor and the second insulated gate bipolar transistor in the half-bridge LC series resonant circuit by integrating information such as voltage, current and oven temperature, and further controls the temperature and power of the multi-head induction cooker, thereby achieving precise control of cooking temperature and power, thereby reducing the overall energy consumption of the multi-head induction cooker, effectively avoiding problems such as insufficient heating, slow heating and excessive heating, and enabling the induction cooker to meet the heating requirements of the user.

[0038] In another preferred embodiment based on the above embodiment, refer to Figure 6-8 As shown, this embodiment provides an induction cooker for applying the above-mentioned multi-head half-bridge induction cooker power and temperature control system, including: The induction cooker body 1 includes a glass plate 10 and a base 11. The glass plate 10 is embedded in the base 11. The glass plate 10 has a first groove 100, and the base 11 has a second groove 110. The first groove 100 is provided with a temperature probe 20. The top of the temperature probe 20 passes through the glass plate 10. The second groove 110 is tightly fitted with the temperature probe 20.

[0039] Specifically, the glass plate 10 is embedded in the base 11, and the base 11 provides good support for the glass plate 10 to prevent the glass plate 10 from being affected by local stress and thus deforming when the pot is attached to the glass plate 10. The glass plate 10 has a first groove 100, and the base 11 has a second groove 110. The first groove 100 and the second groove 110 cooperate with each other to effectively fix the temperature probe 20. The temperature probe 20 is a temperature sensor that can accurately detect the temperature of the pot. In addition, the temperature probe 20 passes through the glass plate 10 and directly contacts the bottom of the pot, reducing the error in pot temperature detection. The temperature probe 20 uses an aluminum shell and non-magnetic material to improve the response speed during detection. Detecting the pot temperature through the temperature probe 20 allows the induction cooker to accurately reach the set target temperature by adjusting different continuous constant power outputs according to different cooking conditions, so that the induction cooker can meet the user's heating requirements.

[0040] Those skilled in the art will appreciate that the embodiments of the present application may be provided as a system, system, or computer program commodity. Thus, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware. Furthermore, the present application may take the form of a computer program commodity implemented on one or more computer-usable storage media (including but not limited to magnetic disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0041] The present application is described with reference to the flowcharts and / or block diagrams of the systems, devices (systems) and computer program products according to the embodiments of the present application. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of processes and / or boxes in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 a process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0042] These computer program instructions may also be stored in a computer-readable storage device that can direct a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable storage device produce an article of manufacture comprising an instruction device that implements the process. Figure 1 a process or multiple processes and / or boxes Figure 1 The function specified in one or more boxes.

[0043] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operational steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing the instructions executed on the computer or other programmable device for implementing the process. Figure 1 a process or multiple processes and / or boxes Figure 1 The steps for the function specified in one or more boxes.

[0044] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit it. Although the present invention has been described in detail with reference to the above embodiments, ordinary technicians in the field should understand that the specific implementation methods of the present invention can still be modified or replaced by equivalents. Any modification or equivalent replacement that does not depart from the spirit and scope of the present invention should be covered by the scope of protection of the claims of the present invention.

Claims

1. A power and temperature control system for a multi-head half-bridge induction cooker, characterized in that: include: Voltage detection circuit, current detection circuit, furnace temperature detection circuit, half-bridge LC series resonant circuit and microcontroller; The microcontroller is connected to the voltage detection circuit, the current detection circuit and the furnace temperature detection circuit, the current detection circuit is connected in series with the half-bridge LC series resonant circuit, and the current detection circuit converts the current into a voltage and outputs it to the microcontroller; The half-bridge LC series resonant circuit includes an inductor, a first capacitor, a second capacitor, a third capacitor, a fourth capacitor, a fifth capacitor, a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor, a ninth resistor, a first interface, a second interface, a first insulated gate bipolar transistor, a second insulated gate bipolar transistor, a first diode, and a second diode; The first resistor, the second resistor and the third resistor are connected in series, one end of the third resistor is grounded, the fourth resistor and the fifth resistor are connected in series, the sixth resistor and the seventh resistor are connected in series, the eighth resistor and the first diode are connected in series, and the ninth resistor and the second diode are connected in series; One end of the first capacitor is connected to the inductor, and the other end of the first capacitor is grounded; the second capacitor is connected to one end of the third capacitor and the second interface, and the other end of the third capacitor is grounded; the fourth capacitor is connected to one end of the fifth capacitor and the first interface, and the other end of the fifth capacitor is grounded; The collector of the first insulated gate bipolar transistor is connected to the inductor, the emitter of the first insulated gate bipolar transistor is connected to the collector of the second insulated gate bipolar transistor, the emitter of the second insulated gate bipolar transistor is grounded, the base of the first insulated gate bipolar transistor is connected to the eighth resistor and the first diode, and the base of the second insulated gate bipolar transistor is connected to the ninth resistor and the second diode.

2. The power and temperature control system for a multi-head half-bridge induction cooker according to claim 1, characterized in that: The voltage detection circuit comprises: a voltage input port, a tenth resistor, an eleventh resistor, a twelfth resistor, a thirteenth resistor, and a fourteenth resistor; The voltage input port is used to provide an input voltage, and the voltage input port is connected in series with the eleventh resistor, the twelfth resistor, the thirteenth resistor, and the fourteenth resistor and then grounded; The tenth resistor is connected to a connection node between the thirteenth resistor and the fourteenth resistor.

3. The power and temperature control system for a multi-head half-bridge induction cooker according to claim 2, characterized in that: The voltage detection circuit further includes: a sixth capacitor, a third diode, a DC conversion port, and a first power supply voltage; One end of the sixth capacitor is connected to the tenth resistor and the DC conversion port, and the other end of the sixth capacitor is grounded; An anode of the third diode is connected to the tenth resistor and the DC conversion port, and a cathode of the third diode is connected to the first power supply voltage.

4. The power and temperature control system for a multi-head half-bridge induction cooker according to claim 3, characterized in that: The current detection circuit comprises: a current detection input port, a seventh capacitor, and a fifteenth resistor; One end of the seventh capacitor is connected to the current detection input port, and the other end of the seventh capacitor is grounded; The current detection input port is connected to the fifteenth resistor.

5. The power and temperature control system for a multi-head half-bridge induction cooker according to claim 4, characterized in that: The current detection circuit further includes: an eighth capacitor, a ninth capacitor, a second power supply voltage and a current sensor; The GND pin of the current sensor is grounded; The NC pin of the current sensor is connected to one end of the eighth capacitor, and the other end of the eighth capacitor is grounded; The VOUT pin of the current sensor is connected to the fifteenth resistor, and the VOUT pin converts the current into a voltage and outputs the voltage to the microcontroller; The VCC pin of the current sensor and the second power supply voltage are connected to one end of the ninth capacitor, and the other end of the ninth capacitor is grounded.

6. The power and temperature control system for a multi-head half-bridge induction cooker according to claim 5, characterized in that: The current detection circuit further includes: DC power input port; The IP+1 pin and the IP+2 pin of the current sensor are connected to the DC power input port; The IP-1 pin and the IP-2 pin of the current sensor are connected to the half-bridge LC series resonant circuit.

7. The power and temperature control system for a multi-head half-bridge induction cooker according to claim 6, characterized in that: The furnace temperature detection circuit comprises: a temperature sensor, a sixteenth resistor, a tenth capacitor, and a third power supply voltage; Pin 1 of the temperature sensor is connected to the third power supply voltage and the tenth capacitor; Pin 2 of the temperature sensor is connected to one end of the sixteenth resistor, and the other end of the sixteenth resistor is grounded.

8. The power and temperature control system for a multi-head half-bridge induction cooker according to claim 7, characterized in that: The furnace temperature detection circuit also includes: a seventeenth resistor, an eighteenth resistor, a nineteenth resistor, a twentieth resistor, a twenty-first resistor, an eleventh capacitor, a transistor, a temperature input port, and a temperature switching port; One end of the seventeenth resistor is connected to the tenth capacitor, the other end of the seventeenth resistor is connected to the base of the transistor, and the emitter of the transistor is grounded; One end of the eighteenth resistor is connected to pin 2 of the temperature sensor, and the other end of the eighteenth resistor is connected to one end of the nineteenth resistor; The other end of the nineteenth resistor is connected to the temperature input port and one end of the eleventh capacitor, and the end of the eleventh capacitor away from the nineteenth resistor is grounded; One end of the 20th resistor is connected to the collector of the transistor, and the other end of the 20th resistor is grounded; One end of the twenty-first resistor is connected to the collector of the transistor, and the other end of the twenty-first resistor is connected to the temperature switching port.

9. The power and temperature control system for a multi-head half-bridge induction cooker according to claim 8, characterized in that: Also includes: The PA0-WKUP1 pin of the microcontroller is connected to the DC conversion port; The PB3 pin of the microcontroller is connected to the current detection input port; The PA4 pin of the microcontroller is connected to the temperature input port; The PA11 pin of the microcontroller is connected to the temperature switching port; The microcontroller is used for calculating power or other parameters.

10. An induction cooker, used for applying the multi-head half-bridge induction cooker power and temperature control system according to any one of claims 1 to 9, characterized in that: include: An induction cooker body, comprising a glass plate and a base; The glass plate is embedded in the base, the glass plate is provided with a first groove, the base is provided with a second groove, a temperature probe is set in the first groove, the top of the temperature probe passes through the glass plate, and the second groove is tightly fitted with the temperature probe.

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