WO2022143248A1 - 半桥驱动加热检锅电路、加热设备、检锅方法、存储介质 - Google Patents

半桥驱动加热检锅电路、加热设备、检锅方法、存储介质 Download PDF

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Publication number
WO2022143248A1
WO2022143248A1 PCT/CN2021/139560 CN2021139560W WO2022143248A1 WO 2022143248 A1 WO2022143248 A1 WO 2022143248A1 CN 2021139560 W CN2021139560 W CN 2021139560W WO 2022143248 A1 WO2022143248 A1 WO 2022143248A1
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WIPO (PCT)
Prior art keywords
heating device
electromagnetic heating
pulse
pot
current
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PCT/CN2021/139560
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English (en)
French (fr)
Inventor
曾露添
朱成彬
雷俊
江德勇
刘文华
王云峰
Original Assignee
佛山市顺德区美的电热电器制造有限公司
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Application filed by 佛山市顺德区美的电热电器制造有限公司 filed Critical 佛山市顺德区美的电热电器制造有限公司
Priority to EP21913989.6A priority Critical patent/EP4258815A4/en
Priority to US18/270,120 priority patent/US20240057811A1/en
Publication of WO2022143248A1 publication Critical patent/WO2022143248A1/zh

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    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B6/00—Heating by electric, magnetic or electromagnetic fields
    • H05B6/02—Induction heating
    • H05B6/06—Control, e.g. of temperature, of power
    • H05B6/062—Control, e.g. of temperature, of power for cooking plates or the like
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47J—KITCHEN EQUIPMENT; COFFEE MILLS; SPICE MILLS; APPARATUS FOR MAKING BEVERAGES
    • A47J36/00—Parts, details or accessories of cooking-vessels
    • A47J36/24—Warming devices
    • A47J36/2483—Warming devices with electrical heating means
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47J—KITCHEN EQUIPMENT; COFFEE MILLS; SPICE MILLS; APPARATUS FOR MAKING BEVERAGES
    • A47J27/00—Cooking-vessels
    • A47J27/002—Construction of cooking-vessels; Methods or processes of manufacturing specially adapted for cooking-vessels
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47J—KITCHEN EQUIPMENT; COFFEE MILLS; SPICE MILLS; APPARATUS FOR MAKING BEVERAGES
    • A47J36/00—Parts, details or accessories of cooking-vessels
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B6/00—Heating by electric, magnetic or electromagnetic fields
    • H05B6/02—Induction heating
    • H05B6/04—Sources of current
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B6/00—Heating by electric, magnetic or electromagnetic fields
    • H05B6/02—Induction heating
    • H05B6/10—Induction heating apparatus, other than furnaces, for specific applications
    • H05B6/12—Cooking devices
    • H05B6/1209—Cooking devices induction cooking plates or the like and devices to be used in combination with them
    • H05B6/1245—Cooking devices induction cooking plates or the like and devices to be used in combination with them with special coil arrangements
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B2213/00—Aspects relating both to resistive heating and to induction heating, covered by H05B3/00 and H05B6/00
    • H05B2213/05—Heating plates with pan detection means

Definitions

  • the present disclosure relates to the technical field of household electrical appliances, and in particular to a half-bridge driving heating pan detection circuit for electromagnetic heating devices, an electromagnetic heating device, a pan detection method for electromagnetic heating devices, a computer-readable storage medium, and a Electromagnetic heating equipment. .
  • the electromagnetic heating equipment generally adopts the half-bridge topology electromagnetic induction heating to detect the pot.
  • the PWM1 and PWM2 pins of the controller 500 continuously output complementary PWM signals, and the duration of each pot inspection cycle is about 1 second.
  • the switches 602 and 603 are turned on and off alternately, and the current flowing through the coil disk 604 is sampled by the current transformer 701, and converted from a large current signal of tens of amperes to a small signal of tens of milliamperes
  • the current flows through the load resistor R2 and is converted into a voltage signal of about 0 to 5V, and is filtered by the filter circuit composed of the resistor 703 and the capacitor 704, and then sent to the ADC analog-to-digital conversion pin of the controller 500.
  • the controller 500 presets the pot detection current threshold in the program.
  • the controller 500 sets the pot flag to determine that there is a pot on the current heating stove; If the current value after digital conversion is less than the preset threshold, the controller 500 clears the pot flag, and determines that there is no pot on the current heating stove.
  • This method of detecting whether there is a pot is determined by detecting the current flowing through the coil plate. In the case of no pot, the half-bridge module consumes about 40 to 50 watts of power consumption, which is borne by the switch tube, so it is easy to It leads to large loss of switch tube and poor reliability.
  • one object of the present disclosure is to propose a half-bridge driving heating pan detection circuit of an electromagnetic heating device, which can effectively improve the reliability of pan detection and at the same time increase the service life of the electromagnetic heating device.
  • Two purposes of the present disclosure are to propose an electromagnetic heating device.
  • the three purposes of the present disclosure are to provide a pan inspection method for electromagnetic heating equipment.
  • Four objects of the present disclosure are to propose a computer-readable storage medium.
  • Five objects of the present disclosure are to propose an electromagnetic heating device.
  • the embodiment of the first aspect of the present disclosure proposes a half-bridge driving heating pot detection circuit of an electromagnetic heating device.
  • the circuit includes a control module and a pulse pot detection module, wherein the control module is used to output a single pulse
  • the pot detection signal is sent to the half-bridge drive module of the electromagnetic heating device, so as to drive the coil disc to perform resonance operation through the half-bridge drive module;
  • the pulse detection module is connected to the coil disc, and the pulse detection module is used to detect the resonant current of the coil disk, and generate a pulse signal according to the resonant current of the coil disk;
  • the control module is connected to the pulse detection module, and the control module is also used for counting the pulse signal, and according to The number of the pulse signals determines whether a cookware is placed on the electromagnetic heating device.
  • the half-bridge driving heating pan detection circuit of the embodiment of the present disclosure includes a control module and a pulse pan detection module, wherein the control module first outputs a pulse pan detection signal to the half-bridge driving module of the electromagnetic heating device, so as to drive the coil through the half-bridge driving module
  • the disk performs resonant work. Since the coil disk is connected to the pulse detection module, the pulse detection module can detect the resonant current of the coil disk and generate a pulse signal according to the resonant current, and then the control module counts the pulse signal to determine the pulse signal according to the pulse. The number of signals determines whether there is a cookware placed on the electromagnetic heating device. Therefore, the half-bridge driving heating pan detection circuit of the electromagnetic heating device can effectively improve the reliability of the pan detection and at the same time improve the service life of the electromagnetic heating device.
  • the pulse detection module includes: a current detection unit, the current detection unit is connected to the coil disk, and the current detection unit is used to detect the resonant current of the coil disk to output the detection pot a current signal; a load unit, the load unit is connected to the current detection unit, and the load unit is used for generating a voltage detection signal according to the pot detection current signal; a zero-crossing voltage comparison unit, the zero-crossing voltage comparison unit is connected to the The load unit is connected, and the zero-crossing voltage comparison unit is configured to output the pulse signal according to the voltage detection signal.
  • the zero-crossing voltage comparison unit includes: a current limiting resistor, one end of the current limiting resistor is connected to one end of the load unit; a comparator, a positive input end of the comparator is connected to the The other end of the current limiting resistor is connected to the other end of the current limiting resistor, the negative input end of the comparator is connected to the other end of the load unit, and the output end of the comparator is connected to the control module; a forward voltage clamping diode, the The anode of the forward voltage clamping diode is connected to the positive input terminal of the comparator, and the cathode of the forward voltage clamping diode is connected to the negative input terminal of the comparator; The anode of the reverse voltage clamp diode is connected to the negative input terminal of the comparator, and the cathode of the reverse voltage clamp diode is connected to the positive input terminal of the comparator.
  • the half-bridge driving module includes an upper-bridge switch tube and a lower-bridge switch tube
  • the current detection unit includes a current transformer, and one end of the primary coil of the current transformer is connected to the upper the node between the bridge switch tube and the lower bridge switch tube, the other end of the primary coil of the current transformer is connected to the coil disk, and the two ends of the secondary coil of the current transformer are connected to the load unit.
  • the load unit includes: a first resistor, one end of the first resistor is connected to one end of the secondary coil of the current transformer, and the other end of the first resistor is connected to the The other end of the secondary coil of the current transformer is connected; the second resistor, one end of the second resistor is connected with one end of the first resistor; the first diode, the anode of the first diode is connected to the The other end of the first resistor is connected to the other end of the first resistor, the cathode of the first diode is connected to the other end of the second resistor; the second diode, the anode of the second diode is connected to the second resistor The other end of the second diode is connected to the other end of the first resistor.
  • the resistance value of the second resistor is much smaller than the resistance value of the first resistor.
  • control module outputs the single-pulse pot detection signal to the half-bridge driving module after delaying a first preset time, so as to drive the upper-bridge switch tube or the lower-bridge switch The tube is turned on, and the coil disk starts to resonate after the upper bridge switch tube or the lower bridge switch tube is turned on.
  • control module determines that a cookware is placed on the electromagnetic heating device when the number of the pulse signals is less than a first preset value.
  • the second aspect of the present disclosure provides an electromagnetic heating device, the electromagnetic heating device includes the half-bridge driving heating pan detection circuit of the electromagnetic heating device described in the above embodiments.
  • the function of the half-bridge driving heating detection circuit of the electromagnetic heating device in the above-mentioned embodiment can be realized by the electromagnetic heating device, so that the reliability of the detection of the pan can be effectively improved, and the use of the electromagnetic heating device can be improved at the same time. life.
  • a third aspect of the present disclosure provides a pot detection method for electromagnetic heating equipment.
  • the pot detection method includes: outputting a single-pulse pot detection signal to a half-bridge drive module of the electromagnetic heating device, so as to pass The half-bridge drive module drives the coil disk to perform resonance operation; detects the resonant current of the coil disk through the pulse detection module, and generates a pulse signal according to the resonant current of the coil disk; The number of the pulse signals determines whether a cookware is placed on the electromagnetic heating device.
  • a single-pulse pot detection signal is output to the half-bridge driving module of the electromagnetic heating device, so that the half-bridge driving module drives the coil disk to perform resonance operation, and the pulse detection module detects the inside of the coil disk. Then, a pulse signal is generated according to the resonance current in the coil disk, and the pulse signal is counted, and according to the number of the pulse signal, it is judged whether there is a pot on the electromagnetic heating device. Therefore, the pot inspection method of the electromagnetic heating device can effectively improve the reliability of the pot inspection, and at the same time improve the service life of the electromagnetic heating device.
  • judging whether a cookware is placed on the electromagnetic heating device according to the number of the pulse signals includes: judging whether the number of the pulse signals is less than a first preset value; if so, determining the A cookware is placed on the electromagnetic heating device; if not, it is determined that no cookware is placed on the electromagnetic heating device.
  • a fourth aspect of the present disclosure provides a computer-readable storage medium on which a pan inspection program of an electromagnetic heating device is stored, and the pot inspection program of the electromagnetic heating device is executed by a processor to achieve the above-mentioned The method for detecting the pot of the electromagnetic heating device described in the embodiment.
  • the processor executes the pot inspection program of the electromagnetic heating device stored on the storage medium, which can effectively improve the reliability of pot inspection and improve the service life of the electromagnetic heating device.
  • an embodiment of the fifth aspect of the present disclosure proposes an electromagnetic heating device, the electromagnetic heating device includes a memory, a processor, and a pan inspection program of the electromagnetic heating device stored in the memory and running on the processor, When the processor executes the pot inspection program, the pot inspection method of the electromagnetic heating device according to the above-mentioned embodiment is implemented.
  • the processor executes the pan inspection program of the electromagnetic heating device stored in the memory, which can effectively improve the reliability of the pan inspection and improve the service life of the electromagnetic heating device.
  • FIG. 1 is a schematic diagram of a half-bridge topology electromagnetic induction heating pot detection circuit of an electromagnetic heating device in the related art
  • FIG. 2 is a schematic diagram of a half-bridge driving heating pot detection circuit of an electromagnetic heating device according to an embodiment of the present disclosure
  • FIG. 3 is a schematic diagram of a pot detection signal according to an embodiment of the present disclosure.
  • FIG. 4 is a schematic diagram of a pot detection signal according to another embodiment of the present disclosure.
  • FIG. 5 is a flow chart of a pan detection method of an electromagnetic heating device according to an embodiment of the present disclosure.
  • FIG. 2 is a schematic diagram of a half-bridge driving heating pan detection circuit of an electromagnetic heating device according to an embodiment of the present disclosure.
  • the half-bridge driving heating pan detection circuit of the electromagnetic heating device includes a control module 100 and a pulse pan detection module 300 .
  • the control module 100 is used to output a single-pulse pot detection signal to the half-bridge drive module of the electromagnetic heating device, so as to drive the coil disk to perform resonance operation through the half-bridge drive module; the pulse detection module 300 is connected to the coil disk, and the pulse detection module 300 uses The control module 100 is connected to the pulse detection module 300, and the control module 100 is also used to count the pulse signals and judge the electromagnetic heating according to the number of pulse signals. Whether cookware is placed on the appliance.
  • the control module 100 is provided with two PWM pins, namely PWM1 and PWM2.
  • the control module 100 outputs a single-pulse pot detection signal through PWM2 to drive the half-bridge of the electromagnetic heating device.
  • the coil disk 204 in the half-bridge driving module 200 can be made to perform resonance operation.
  • W10 represents the single-pulse pot detection signal output by PWM2
  • W11 is the resonance signal of the coil disk 204. It can be seen from FIG. 3 that the coil disk 204 is driven by the single-pulse pot detection signal. , which can generate LC resonance with capacitor 205 and capacitor 206, thereby generating a resonance signal. Due to the consumption of internal resistance, its resonance signal will become weaker and weaker until it disappears.
  • the pulse detection module 300 is connected to the coil disk 204.
  • the pulse detection module 300 can detect the resonant current of the coil disk 204 and generate a pulse signal according to the coil disk 204, as shown in the figure.
  • the W12 signal shown in 3 is the pulse signal generated by the pulse detection module 300 according to the resonant current of the coil disk 204 .
  • the resonant current of the coil disk 204 can be detected by the pulse detection module 300 and a pulse signal corresponding to the resonant current can be generated, and then the pulse signal can be counted by the control module 100 connected to the pulse detection module 300, After the number of pulse signals is obtained, it can be further judged whether there is a pot on the electromagnetic heating device according to the number of pulse signals.
  • the pulse detection module 300 includes a current detection unit 301 , a load unit 3020 and a zero-cross voltage comparison unit 303 .
  • the current detection unit 301 is connected to the coil disk 204, and the current detection unit 301 is used to detect the resonant current of the coil disk 204 to output the current signal of the pot detection;
  • the load unit 3020 is connected to the current detection unit 301, and the load unit 3020 is used to detect the pot according to the current signal.
  • the current signal generates a voltage detection signal;
  • the zero-crossing voltage comparison unit 303 is connected to the load unit 3020, and the zero-crossing voltage comparison unit 303 is used for outputting a pulse signal according to the voltage detection signal.
  • the half-bridge driving module 200 includes an upper bridge switch tube 202 and a lower bridge switch tube 203
  • the current detection unit 301 includes a current transformer, and one end of the primary coil of the current transformer is connected to the upper At the node between the bridge switch tube 202 and the lower bridge switch tube 203 , the other end of the primary coil of the current transformer is connected to the coil disk 204 , and the two ends of the secondary coil of the current transformer are connected to the load unit 3020 .
  • the current detection unit 301 includes a current transformer, through which the high current signal of ten amperes flowing through the coil disk 204 can be converted into a small current digital signal of tens of milliamps, and the signal is isolated effect. After the current detection unit 301 obtains the small current digital signal, the signal passes through the load unit 3020 to generate a corresponding voltage detection signal. Then, the voltage detection signal is compared by the zero-crossing voltage comparison unit 303 to obtain a pulse signal corresponding to the voltage detection signal, and the controller 100 obtains the pulse signal.
  • the load unit 3020 includes a first resistor R1 , a second resistor R2 , a first diode D1 and a second diode D2 .
  • One end of the first resistor R1 is connected to one end of the secondary coil of the current transformer, the other end of the first resistor R1 is connected to the other end of the secondary coil of the current transformer; one end of the second resistor R2 is connected to the first resistor One end of R1 is connected; the anode of the first diode D1 is connected to the other end of the first resistor R1; the cathode of the first diode D1 is connected to the other end of the second resistor R2; the anode of the second diode D2 is connected to The other end of the second resistor R2 is connected, and the cathode of the second diode D2 is connected to the other end of the first resistor R1.
  • the combination of the second resistor R2, the first diode D1 and the second diode D2 can be used as the second load unit, and the first resistor R1 can be used as the first load unit, wherein , the resistance value of the second resistor R2 is much smaller than the resistance value of the first resistor R1, optionally, the resistance value range of the first resistor R1 is 50 to 5000 ohms, and the resistance value range of the second resistor is 1 to 50 ohms.
  • the first load unit When the resonant current generated by the coil disk 204 is small, for example, less than 1 ampere, the first load unit is used to convert the signal into a voltage signal; and if the resonant current generated by the coil disk 204 is relatively large, such as greater than 1 ampere, the first load unit is used to convert the signal into a voltage signal.
  • the second load unit converts the signal into a voltage signal.
  • the zero-crossing voltage comparison unit 303 includes a current limiting resistor R3 , a comparator CMP1 , a forward voltage clamping diode D4 and a reverse voltage clamping diode D5 .
  • One end of the current limiting resistor R3 is connected to one end Va of the load unit 3020; the positive input end of the comparator CMP1 is connected to the other end of the current limiting resistor R3, and the negative input end of the comparator CMP1 is connected to the other end Vb of the load unit 3020 , the output terminal of the comparator CMP1 is connected to the control module 100; the anode of the forward voltage clamping diode D4 is connected to the positive input terminal of the comparator CMP1, and the cathode of the forward voltage clamping diode D4 is connected to the negative input terminal of the comparator CMP1 ; The anode of the reverse voltage clamping diode D5 is connected to the negative input terminal of the comparator CMP1, and the cathode of the reverse voltage clamping diode D5 is connected to the positive input terminal of the comparator CMP1.
  • the zero-crossing voltage comparison unit 303 includes two voltage clamping diodes, namely the forward voltage clamping diode D4 and the reverse voltage clamping diode D5.
  • the current signal passes through the load unit 3020, it is After being converted into a voltage signal, it can be measured from both ends of the load unit 3020, namely the Va terminal and the Vb terminal.
  • the voltage difference across the load unit 3020 is greater than the first preset voltage, such as 0.7V, the voltage at the non-inverting input terminal can be limited to 0.7V by the forward voltage clamping diode D4; if the voltage difference across the load unit 3020 is greater than the second voltage A preset voltage, such as minus 0.7 volts, can limit the voltage at the non-inverting input to minus 0.7 volts through the reverse voltage clamp diode D5. Therefore, it can play the role of protecting the non-inverting input terminal of the comparator CMP1.
  • the first preset voltage such as 0.7V
  • the comparator CMP1 When the voltage of the non-inverting input terminal of the comparator CMP1 is higher than the voltage of the inverting input terminal, the comparator CMP1 outputs a high level; if the voltage of the non-inverting input terminal of the comparator CMP1 is lower than Inverting the voltage at the input, then the comparator CMP1 outputs a low level.
  • the control module 100 outputs a single-pulse pot detection signal to the half-bridge driving module 200 after delaying a first preset time to drive the upper-bridge switch tube 202 or the lower-bridge switch
  • the tube 203 is turned on, and the coil disk 204 starts to resonate after the upper bridge switch tube 202 or the lower bridge switch tube 203 is turned on.
  • the control module 100 outputs a single-pulse pot detection signal at time t11 through the PWM2 pin after delaying the first preset time T10 W10 goes to the half-bridge driving module 200 to drive the upper-bridge switch 202 or the lower-bridge switch 203 to conduct.
  • the single-pulse signal pot detection signal W10 is a high-level pot detection pulse, wherein the duration of the high-level pulse is 1 microsecond to 10 microseconds, as indicated by Td in FIG. 3 .
  • the coil disk 204 and the resonant capacitors 205 and 206 generate LC resonance, and the resonant signal is shown as the waveform signal W11 in FIG.
  • the current output by the current transformer is also positive.
  • the voltages of the Va and Vb nodes are Positive value, if the voltage of Va, Vb exceeds the first preset voltage, such as 0.7V, the voltage of the non-inverting input terminal of the comparator CMP1 is clamped to 0.7V by the diode D4, which plays the role of protecting the non-inverting input terminal.
  • the voltage at the non-inverting input terminal of the comparator is higher than the voltage at the inverting input terminal, and the comparator CMP1 outputs a high level.
  • the current output by the current transformer is also in the negative direction.
  • the voltages of the Va and Vb nodes are Negative value, if the voltage of Va, Vb exceeds the second preset voltage, such as negative 0.7V, the voltage of the non-inverting input terminal of the comparator CMP1 is clamped to negative 0.7V by the diode D4, which plays the role of protecting the non-inverting input terminal.
  • the voltage of the non-inverting input terminal of the comparator CMP1 is lower than the voltage of the inverting input terminal, and the comparator CMP1 outputs a low level.
  • the above is the working process of one resonance period of the coil disk 204, and the above working process is repeated later. Since no cookware is placed on the coil plate 204, the energy of the coil plate 204 in the half-bridge drive module 200 is mainly consumed by the internal resistance of the coil plate 204. Since the internal resistance of the coil plate 204 is very small, about a few milliohms, the coil The energy consumption of the disk 204 is small, and the energy consumption is completed when the current of the coil disk 204 drops to 0 ampere after many resonant cycles, and the corresponding comparator CMP1 outputs more pulses. As shown in FIG.
  • the control module 100 determines that the cookware is placed on the electromagnetic heating device when the number of pulse signals is less than the first preset value. For example, if the first preset value is 8, since the number of pulse signals output by the comparator CMP1 is not less than the first preset value, it can be determined that no cookware is placed on the electromagnetic device.
  • W20 is the waveform signal of the PWM2 pin output by the control module 100; W21 is the current waveform of the coil plate 204, and W22 is the zero-crossing voltage The pulse waveform output by the comparison unit 303.
  • the specific working process can be shown in the above-mentioned embodiment without placing the pot. The difference is that, since the coil plate 204 is placed with a cookware, the energy of the coil plate 204 is mainly consumed by the cookware. Since the equivalent resistance of the cooker is in the order of several ohms, it is much larger than the internal resistance of the coil plate 204 in the order of several milliohms.
  • the control module 100 determines that the cookware is placed on the electromagnetic heating device when the number of pulse signals is less than the first preset value. For example, if the first preset value is 8, since the number of pulse signals output by the comparator CMP1 is less than the first preset value, it can be determined that a cookware is placed on the electromagnetic device.
  • the controller can first determine whether the current pot flag is zero. If it is zero, the pot inspection operation can be performed by the above-mentioned embodiment. If a pot is placed on the device, the current pot flag is set to 1; if the controller determines that the current pot flag is not zero, it indicates that there is a pot on the current electromagnetic heating device.
  • the controller can only output a short pulse to PWM2 during the detection of the pot, the pulse width is about 1 microsecond to 10 microseconds, and the lower bridge switches.
  • the tube obtains energy from the power supply through this time period, and then the coil disc and the resonant capacitor resonate, and the resonant period is obtained through the number of pulses output by the zero-crossing voltage comparison unit 303 to detect the cookware. Therefore, the switch tube in the half-bridge driving heating pot detection circuit is only turned on for a very short time, and the upper bridge switch tube is not turned on. During pot detection, the switching tube loss of the half-bridge driving heating pot detection circuit is greatly reduced, which can effectively improve the Check the reliability of the pot, and at the same time improve the service life of the electromagnetic heating equipment.
  • an electromagnetic heating device which includes the half-bridge driving heating pan detection circuit of the electromagnetic heating device in the above-mentioned embodiments.
  • the function of the half-bridge driving heating detection circuit of the electromagnetic heating device in the above-mentioned embodiment can be realized by the electromagnetic heating device, so that the reliability of the detection of the pan can be effectively improved, and the use of the electromagnetic heating device can be improved at the same time. life.
  • FIG. 5 is a flow chart of a pan detection method of an electromagnetic heating device according to an embodiment of the present disclosure.
  • the present disclosure proposes a pot inspection method for an electromagnetic heating device.
  • the pot inspection method in this embodiment includes the following steps: S10 , outputting a single-pulse pot inspection signal to the half-bridge drive of the electromagnetic heating device module to drive the coil disk through the half-bridge drive module for resonant operation.
  • S20 the resonant current of the coil disk is detected by the pulse detection module, and a pulse signal is generated according to the resonant current of the coil disk.
  • S30 count the pulse signals, and judge whether a cookware is placed on the electromagnetic heating device according to the number of the pulse signals.
  • the control module 100 is provided with two PWM pins, namely PWM1 and PWM2.
  • the control module 100 outputs a single-pulse pot detection signal to the electromagnetic heating device through PWM2.
  • the coil disk 204 in the half-bridge driving module 200 can perform resonance operation.
  • W10 represents the single-pulse pot detection signal output by PWM2
  • W11 is the resonance signal of the coil disk 204. It can be seen from FIG. 3 that the coil disk 204 is driven by the single-pulse pot detection signal. , which can generate LC resonance with capacitor 205 and capacitor 206, thereby generating a resonance signal. Due to the consumption of internal resistance, its resonance signal will become weaker and weaker until it disappears.
  • the pulse detection module 300 is connected to the coil disk 204.
  • the pulse detection module 300 can detect the resonant current of the coil disk 204 and generate a pulse signal according to the coil disk 204, as shown in the figure.
  • the W12 signal shown in 3 is the pulse signal generated by the pulse detection module 300 according to the resonant current of the coil disk 204 .
  • the resonant current of the coil disk 204 can be detected by the pulse detection module 300 and a pulse signal corresponding to the resonant current can be generated, and then the pulse signal can be counted by the control module 100 connected to the pulse detection module 300, After the number of pulse signals is obtained, it can be further judged whether there is a pot on the electromagnetic heating device according to the number of pulse signals.
  • determining whether the cookware is placed on the electromagnetic heating device according to the number of pulse signals includes: judging whether the number of pulse signals is less than a first preset value; if so, determining whether the cookware is placed on the electromagnetic heating device; If not, make sure no pan is placed on the induction heating device.
  • the controller when detecting the pot, can only output a short pulse to PWM2, the pulse width is about 1 microsecond to 10 microseconds, and the lower bridge switch tube passes this time.
  • the segment obtains energy from the power supply, and then the coil disc and the resonant capacitor resonate, and the resonant period is obtained through the number of pulses output by the zero-crossing voltage comparison unit 303 to detect the pot.
  • the switch tube in the pot detection circuit is only turned on for a very short time, and the upper bridge switch tube is not turned on, and the loss of the switch tube of the half-bridge driving heating pot detection circuit is greatly reduced during pot inspection, which can effectively improve the reliability of the pot inspection. , while improving the service life of electromagnetic heating equipment.
  • the present disclosure proposes a computer-readable storage medium on which a pan inspection program of an electromagnetic heating device is stored. Inspection method.
  • the processor executes the pot inspection program of the electromagnetic heating device stored on the storage medium, which can effectively improve the reliability of the pot inspection and improve the service life of the electromagnetic heating device.
  • an electromagnetic heating device which includes a memory, a processor, and a pan inspection program of the electromagnetic heating device that is stored in the memory and can run on the processor.
  • the processor executes the pan inspection program , to realize the pan detection method of the electromagnetic heating device as in the above-mentioned embodiment.
  • the processor executes the pan inspection program of the electromagnetic heating device stored in the memory, which can effectively improve the reliability of the pan inspection and improve the service life of the electromagnetic heating device.

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Abstract

半桥驱动加热检锅电路、加热设备、检锅方法、存储介质，其中，半桥驱动加热检锅电路包括控制模块（100）和脉冲检锅模块（300），控制模块用于输出单脉冲检锅信号至电磁加热设备的半桥驱动模块（200），以通过半桥驱动模块（200）驱动线圈盘（204）进行谐振工作；脉冲检测模块（300）与线圈盘（204）相连，脉冲检测模块（300）用于检测线圈盘（204）的谐振电流，并根据线圈盘（204）的谐振电流生成脉冲信号；控制模块（100）与脉冲检测模块（300）相连，控制模块（100）还用于对脉冲信号进行计数，并根据脉冲信号的数量判断电磁加热设备上是否放置锅具。电磁加热设备包括半桥驱动加热检锅电路。电磁加热设备的检锅方法对应检锅电路。存储介质存储执行检锅方法的检锅程序。

Description

半桥驱动加热检锅电路、加热设备、检锅方法、存储介质
相关申请的交叉引用
本申请要求于2020年12月29日提交的申请号为202011593061.5、名称为“半桥驱动加热检锅电路、加热设备、检锅方法、存储介质”的中国专利申请的优先权，其全部内容通过引用结合在本申请中。
技术领域
本公开涉及家电设备技术领域，尤其涉及一种电磁加热设备的半桥驱动加热检锅电路，一种电磁加热设备，一种电磁加热设备的检锅方法，一种计算机可读存储介质和一种电磁加热设备。。
背景技术
在相关技术中，电磁加热设备一般采用半桥拓扑电磁感应加热检锅，如图1所示，控制器500的PWM1和PWM2引脚持续输出互补PWM信号，每个检锅周期持续时间约1秒，经半桥驱动芯601后，开关管602和603交替开通和截止，流经线圈盘604的电流经电流互感器701采样后，由数十安培的大电流信号转换为数十毫安小信号电流，流经负载电阻R2后转换为约0～5V电压信号，并经电阻703和电容704组成的滤波电路滤波后送入控制器500的ADC模数转换引脚。控制器500程序内预设检锅电流阀值，若模数转换后的电流数值大于预设阀值，控制器500置位锅具标志位，判别为当前加热炉面上有锅具；若模数转换后的电流数值小于预设阀值，控制器500清零锅具标志位，判别为当前加热炉面上没有锅具。这种通过检测流过线圈盘的电流大小确定是否有锅的检锅方式，在没有锅具的情况下，半桥模块消耗约四五十瓦功耗，这些功耗由开关管承担，从而容易导致开关管损耗大，可靠性差。
公开内容
本公开旨在至少在一定程度上解决相关技术中的技术问题之一。为此，本公开的一个目的在于提出一种电磁加热设备的半桥驱动加热检锅电路，能够有效提高检锅可靠性，同时提高电磁加热设备的使用寿命。
本公开的二个目的在于提出一种电磁加热设备。
本公开的三个目的在于提出一种电磁加热设备的检锅方法。
本公开的四个目的在于提出一种计算机可读存储介质。
本公开的五个目的在于提出一种电磁加热设备。
为达上述目的，本公开第一方面实施例提出了一种电磁加热设备的半桥驱动加热检锅 电路，该电路包括控制模块和脉冲检锅模块，其中，所述控制模块用于输出单脉冲检锅信号至所述电磁加热设备的半桥驱动模块，以通过所述半桥驱动模块驱动线圈盘进行谐振工作；所述脉冲检测模块与所述线圈盘相连，所述脉冲检测模块用于检测所述线圈盘的谐振电流，并根据所述线圈盘的谐振电流生成脉冲信号；所述控制模块与所述脉冲检测模块相连，所述控制模块还用于对所述脉冲信号进行计数，并根据所述脉冲信号的数量判断所述电磁加热设备上是否放置锅具。
本公开实施例的半桥驱动加热检锅电路包括有控制模块和脉冲检锅模块，其中，控制模块先向电磁加热设备的半桥驱动模块输出脉冲检锅信号，以通过半桥驱动模块驱动线圈盘进行谐振工作，由于线圈盘与脉冲检测模块相连，脉冲检测模块可以检测到该线圈盘的谐振电流，并根据该谐振电流生成脉冲信号，然后控制模块对该脉冲信号进行计数，以根据该脉冲信号的数量判断电磁加热设备上是否放置有锅具。由此，该电磁加热设备的半桥驱动加热检锅电路能够有效提高检锅可靠性，同时提高电磁加热设备的使用寿命。
在本公开的一些示例中，所述脉冲检测模块包括：电流检测单元，所述电流检测单元与所述线圈盘相连，所述电流检测单元用于检测所述线圈盘的谐振电流以输出检锅电流信号；负载单元，所述负载单元与所述电流检测单元相连，所述负载单元用于根据所述检锅电流信号生成电压检测信号；过零电压比较单元，所述过零电压比较单元与所述负载单元相连，所述过零电压比较单元用于根据所述电压检测信号输出所述脉冲信号。
在本公开的一些示例中，所述过零电压比较单元包括：限流电阻，所述限流电阻的一端与所述负载单元的一端相连；比较器，所述比较器的正输入端与所述限流电阻的另一端相连，所述比较器的负输入端与所述负载单元的另一端相连，所述比较器的输出端与所述控制模块相连；正向电压钳位二极管，所述正向电压钳位二极管的阳极与所述比较器的正输入端相连，所述正向电压钳位二极管的阴极与所述比较器的负输入端相连；反向电压钳位二极管，所述反向电压钳位二极管的阳极与所述比较器的负输入端相连，所述反向电压钳位二极管的阴极与所述比较器的正输入端相连。
在本公开的一些示例中，所述半桥驱动模块包括上桥开关管和下桥开关管，所述电流检测单元包括电流互感器，所述电流互感器的初级线圈的一端连接到所述上桥开关管与所述下桥开关管之间的节点，所述电流互感器的初级线圈的另一端连接到所述线圈盘，所述电流互感器的次级线圈的两端连接到所述负载单元。
在本公开的一些示例中，所述负载单元包括：第一电阻，所述第一电阻的一端与所述电流互感器的次级线圈的一端相连，所述第一电阻的另一端与所述电流互感器的次级线圈的另一端相连；第二电阻，所述第二电阻的一端与所述第一电阻的一端相连；第一二极管，所述第一二极管的阳极与所述第一电阻的另一端相连，所述第一二极管的阴极与所述第二 电阻的另一端相连；第二二极管，所述第二二极管的阳极与所述第二电阻的另一端相连，所述第二二极管的阴极与所述第一电阻的另一端相连。
在本公开的一些示例中，所述第二电阻的阻值远小于所述第一电阻的阻值。
在本公开的一些示例中，所述控制模块延时第一预设时间后输出所述单脉冲检锅信号至所述半桥驱动模块，以驱动所述上桥开关管或所述下桥开关管导通，所述线圈盘在所述上桥开关管或所述下桥开关管导通后开始谐振。
在本公开的一些示例中，所述控制模块在所述脉冲信号的数量小于第一预设值时确定所述电磁加热设备上放置锅具。
为达上述目的，本公开第二方面实施例提出了一种电磁加热设备，该电磁加热设备包括如上述实施例所述的电磁加热设备的半桥驱动加热检锅电路。
根据本公开实施例的电磁加热设备，通过电磁加热设备能够实现上述实施例中电磁加热设备的半桥驱动加热检锅电路的功能，从而能够有效提高检锅可靠性，同时提高电磁加热设备的使用寿命。
为达上述目的，本公开第三方面实施例提出了一种电磁加热设备的检锅方法，该检锅方法包括：输出单脉冲检锅信号至所述电磁加热设备的半桥驱动模块，以通过所述半桥驱动模块驱动线圈盘进行谐振工作；通过脉冲检测模块检测所述线圈盘的谐振电流，并根据所述线圈盘的谐振电流生成脉冲信号；对所述脉冲信号进行计数，并根据所述脉冲信号的数量判断所述电磁加热设备上是否放置锅具。
根据本公开实施例的检锅方法，首先输出单脉冲检锅信号至电磁加热设备的半桥驱动模块中，以通过半桥驱动模块驱动线圈盘进行谐振工作，并通过脉冲检测模块检测线圈盘中的谐振电流，然后根据该线圈盘中的谐振电流生成脉冲信号，再对该脉冲信号进行计数，并根据该脉冲信号的数量判断电磁加热设备上是否放置有锅具。由此，该电磁加热设备的检锅方法能够有效提高检锅可靠性，同时提高电磁加热设备的使用寿命。
在本公开的一些示例中，根据所述脉冲信号的数量判断所述电磁加热设备上是否放置锅具包括：判断所述脉冲信号的数量是否小于第一预设值；如果是，则确定所述电磁加热设备上放置锅具；如果否，则确定所述电磁加热设备上未放置锅具。
为达上述目的，本公开第四方面实施例提出了一种计算机可读存储介质，其上存储有电磁加热设备的检锅程序，该电磁加热设备的检锅程序被处理器执行时实现如上述实施例所述的电磁加热设备的检锅方法。
根据本公开实施例的计算机可读存储介质，处理器执行存储在该存储介质上的电磁加热设备的检锅程序，能够有效提高检锅可靠性，同时提高电磁加热设备的使用寿命。
为达上述目的，本公开第五方面实施例提出了一种电磁加热设备，该电磁加热设备包 括存储器、处理器及存储在存储器上并可在处理器上运行的电磁加热设备的检锅程序，所述处理器执行所述检锅程序时，实现如上述实施例所述的电磁加热设备的检锅方法。
根据本公开实施例的电磁加热设备，处理器执行存储在存储器上的电磁加热设备的检锅程序，能够有效提高检锅可靠性，同时提高电磁加热设备的使用寿命。
本公开附加的方面和优点将在下面的描述中部分给出，部分将从下面的描述中变得明显，或通过本公开的实践了解到。
附图说明
本公开的上述和/或附加的方面和优点从结合下面附图对实施例的描述中将变得明显和容易理解，其中：
图1是相关技术中电磁加热设备的半桥拓扑电磁感应加热检锅电路的示意图；
图2是本公开实施例的电磁加热设备的半桥驱动加热检锅电路的示意图；
图3是本公开一个实施例的检锅信号的示意图；
图4是本公开另一个实施例的检锅信号的示意图；
图5是本公开实施例的电磁加热设备的检锅方法的流程图。
具体实施方式
下面详细描述本公开的实施例，所述实施例的示例在附图中示出，其中自始至终相同或类似的标号表示相同或类似的元件或具有相同或类似功能的元件。下面通过参考附图描述的实施例是示例性的，旨在用于解释本公开，而不能理解为对本公开的限制。
下面参考附图描述本公开实施例的半桥驱动加热检锅电路、加热设备、检锅方法、存储介质。
图2是本公开实施例的电磁加热设备的半桥驱动加热检锅电路的示意图。
如图2所示，本公开实施例的电磁加热设备的半桥驱动加热检锅电路包括控制模块100和脉冲检锅模块300。
其中，控制模块100用于输出单脉冲检锅信号至电磁加热设备的半桥驱动模块，以通过半桥驱动模块驱动线圈盘进行谐振工作；脉冲检测模块300与线圈盘相连，脉冲检测模块300用于检测线圈盘的谐振电流，并根据线圈盘的谐振电流生成脉冲信号；控制模块100与脉冲检测模块300相连，控制模块100还用于对脉冲信号进行计数，并根据脉冲信号的数量判断电磁加热设备上是否放置锅具。
具体地，参见图2，控制模块100上设置有两个PWM引脚，分别为PWM1和PWM2，在该实施例中，控制模块100通过PWM2输出单脉冲检锅信号至电磁加热设备的半桥驱动模块200中，从而可以使半桥驱动模块200中的线圈盘204进行谐振工作。
更具体地，如图3所示，其中，W10表示PWM2输出的单脉冲检锅信号，W11则是线圈 盘204的谐振信号，由图3可知，线圈盘204在单脉冲检锅信号的驱动下，能够与电容205和电容206发生LC谐振，从而产生谐振信号。由于内阻消耗的原因，其谐振信号将越来越弱，直至消失。
如图2可知，脉冲检测模块300与线圈盘204相连，在线圈盘204产生谐振信号的时候，脉冲检测模块300可以检测到线圈盘204的谐振电流，并根据线圈盘204生成脉冲信号，如图3中所示的W12信号则为脉冲检测模块300根据线圈盘204的谐振电流生成的脉冲信号。
可以理解的是，通过脉冲检测模块300能够检测到线圈盘204的谐振电流并生成与该谐振电流相对应的脉冲信号，然后再利用与脉冲检测模块300相连的控制模块100对脉冲信号进行计数，在得到脉冲信号的数量之后，则根据脉冲信号的数量可以进一步判断电磁加热设备上是否放置有锅具。
在本公开的一些实施例中，如图2所示，脉冲检测模块300包括电流检测单元301、负载单元3020和过零电压比较单元303。
其中，电流检测单元301与线圈盘204相连，电流检测单元301用于检测线圈盘204的谐振电流以输出检锅电流信号；负载单元3020与电流检测单元301相连，负载单元3020用于根据检锅电流信号生成电压检测信号；过零电压比较单元303与负载单元3020相连，过零电压比较单元303用于根据电压检测信号输出脉冲信号。
在该实施例中，如图2所示，半桥驱动模块200包括上桥开关管202和下桥开关管203，电流检测单元301包括电流互感器，电流互感器的初级线圈的一端连接到上桥开关管202与下桥开关管203之间的节点，电流互感器的初级线圈的另一端连接到线圈盘204，电流互感器的次级线圈的两端连接到负载单元3020。
具体地，电流检测单元301包括有电流互感器，通过该电流互感器，能够将流过线圈盘204的十安培的大电流信号转化为数十毫安的小电流数字信号，并起到信号隔离的作用。在电流检测单元301得到小电流数字信号之后，则再将该信号通过负载单元3020以生成相对应的电压检测信号。然后将该电压检测信号通过过零电压比较单元303进行比较以获得与该电压检测信号相对应的脉冲信号，控制器100再对该脉冲信号进行获取。
在一些示例中，如图2所示，负载单元3020包括第一电阻R1、第二电阻R2、第一二极管D1和第二二极管D2。
其中，第一电阻R1的一端与电流互感器的次级线圈的一端相连，第一电阻R1的另一端与电流互感器的次级线圈的另一端相连；第二电阻R2的一端与第一电阻R1的一端相连；第一二极管D1的阳极与第一电阻R1的另一端相连，第一二极管D1的阴极与第二电阻R2的另一端相连；第二二极管D2的阳极与第二电阻R2的另一端相连，第二二极管D2的阴 极与第一电阻R1的另一端相连。
具体地，在该实施例中，可以将第二电阻R2、第一二极管D1和第二二极管D2的组合作为第二负载单元，而第一电阻R1则为第一负载单元，其中，第二电阻R2的阻值远小于第一电阻R1的阻值，可选地，第一电阻R1的阻值范围为50至5000欧姆，第二电阻的阻值范围为1至50欧姆。在线圈盘204所产生的谐振电流较小时，例如小于1安培，则利用第一负载单元将信号转化为电压信号；而如果线圈盘204所产生的谐振电流较大，如大于1安培，则利用第二负载单元将信号转化为电压信号。
在本公开的一些示例中，如图2所示，过零电压比较单元303包括限流电阻R3、比较器CMP1、正向电压钳位二极管D4和反向电压钳位二极管D5。
其中，限流电阻R3的一端与负载单元3020的一端Va相连；比较器CMP1的正输入端与限流电阻R3的另一端相连，比较器CMP1的负输入端与负载单元3020的另一端Vb相连，比较器CMP1的输出端与控制模块100相连；正向电压钳位二极管D4的阳极与比较器CMP1的正输入端相连，正向电压钳位二极管D4的阴极与比较器CMP1的负输入端相连；反向电压钳位二极管D5的阳极与比较器CMP1的负输入端相连，反向电压钳位二极管D5的阴极与比较器CMP1的正输入端相连。
具体地，参见图2可知，过零电压比较单元303中包括有两个电压钳位二极管，分别为正向电压钳位二极管D4和反向电压钳位二极管D5，在电流信号经过负载单元3020被转化为电压信号之后，可以从负载单元3020的两端测到，即Va端和Vb端。如果负载单元3020两端的电压差大于第一预设电压，如0.7伏，则可以通过正向电压钳位二极管D4将同相输入端的电压限制在0.7伏；如果负载单元3020两端的电压差大于第二预设电压，如负0.7伏，则可以通过反向电压钳位二极管D5将同相输入端的电压限制在负0.7伏。从而可以起到保护比较器CMP1的同相输入端的作用，在比较器CMP1同相输入端的电压高于反相输入端的电压时，则比较器CMP1输出高电平；如果比较器CMP1同相输入端的电压低于反相输入端的电压，那么比较器CMP1输出低电平。
在本公开的一些实施例中，如图2所示，控制模块100延时第一预设时间后输出单脉冲检锅信号至半桥驱动模块200，以驱动上桥开关管202或下桥开关管203导通，线圈盘204在上桥开关管202或下桥开关管203导通后开始谐振。
具体地，参见图2和图3，在线圈盘204上没有放置锅具的情况下，控制模块100在延时第一预设时间T10之后，通过PWM2引脚在t11时刻输出单脉冲检锅信号W10至半桥驱动模块200，以驱动上桥开关管202或者下桥开关管203导通。举例而言，如图3所示，该单脉冲信号检锅信号W10为一个高电平检锅脉冲，其中高电平脉冲时长为1微妙至10微妙，如图3中Td所示。在下桥开关管203导通Td时间后，线圈盘204则与谐振电容205 和206发生LC谐振，其谐振信号如图3中W11波形信号所示。
在线圈盘204的电流为正向时，电流互感器输出的电流也为正向，经第一电流负载模块R1或者第二电流负载模块302转换为电压信号后，Va，Vb两节点的电压为正值，若Va，Vb的电压超过第一预设电压，如0.7V，则比较器CMP1同相输入端的电压被二极管D4钳位至0.7V，起到保护同相输入端的作用。比较器同相输入端的电压高于反相输入端的电压，比较器CMP1输出高电平。
在线圈盘204的电流为负向时，电流互感器输出的电流也为负向，经第一电流负载模块R1或者第二电流负载模块302转换为电压信号后，Va，Vb两节点的电压为负值，若Va，Vb的电压超过第二预设电压，如负0.7V，比较器CMP1同相输入端的电压被二极管D4钳位至负0.7V，起到保护同相输入端的作用。比较器CMP1同相输入端的电压低于反相输入端的电压，比较器CMP1输出低电平。
以上为线圈盘204的一个谐振周期的工作过程，后面重复上述工作过程。由于线圈盘204上没有放置锅具，半桥驱动模块200中的线圈盘204的能量主要由线圈盘204的内阻消耗，由于线圈盘204的内阻很小，约数毫欧姆级别，因此线圈盘204能量损耗小，经过多次谐振周期后线圈盘204的电流降至0安培时，能量才消耗完成，相应的比较器CMP1输出的脉冲数会比较多。如图3所示，线圈盘204的谐振电流经过15个周期后降至0安培，如W12波形信号所示，比较器CMP1输出15个脉冲信号。在该实施例中，控制模块100在脉冲信号的数量小于第一预设值时确定电磁加热设备上放置锅具。举例而言，如果该第一预设值为8，则由于比较器CMP1输出的脉冲信号的数量不小于第一预设值，那么可以判定电磁设备上的没有放置锅具。
在线圈盘204上放置有锅具时，如图2和图4所示，其中，W20为控制模块100输出的PWM2管脚的波形信号；W21为线圈盘204的电流波形，W22为过零电压比较单元303输出的脉冲波形。具体工作过程可以参照上述没有放置锅具的实施例所示。不同的是，由于线圈盘204上放置有锅具，线圈盘204的能量主要由锅具消耗，由于锅具的等效电阻为数欧姆级别，比线圈盘204内阻的数毫欧姆级别大很多，因此只需经过数次谐振周期后线圈盘204的电流则会降至0安培，完成能量消耗，相应的比较器CMP1输出的脉冲数较少。如图4的W21波形所示，线圈盘204的谐振电流经过3个周期后降至0安培，如W22波形信号所示，比较器CMP1输出3个脉冲。在该实施例中，控制模块100在脉冲信号的数量小于第一预设值时确定电磁加热设备上放置锅具。举例而言，如果该第一预设值为8，则由于比较器CMP1输出的脉冲信号的数量小于第一预设值，那么可以判定电磁设备上放置有锅具。
可选地，在进行检锅时，可以先通过控制器判断当前锅具标志位是否为零，如果为零， 则可以通过上述实施例进行检锅操作，如果通过上述实施例检锅得到电磁加热设备上放置有锅具，则将当前锅具标志位置为1；如果控制器判断到当前的锅具标志位不为零，则标识当前电磁加热设备上放置有锅具。
综上，通过上述实施例的电磁加热设备的半桥驱动加热检锅电路，在检锅时，控制器可以只对PWM2输出一个短脉冲，脉冲宽度约1微秒至10微秒，下桥开关管通过这个时间段从电源供电处获取能量，之后线圈盘和谐振电容发生谐振，通过过零电压比较单元303输出的脉冲数量获取谐振周期实现检测锅具。从而，半桥驱动加热检锅电路中的开关管只导通非常短的时间，且上桥开关管不导通，检锅时半桥驱动加热检锅电路的开关管损耗大幅降低，能够有效提高检锅可靠性，同时提高电磁加热设备的使用寿命。
进一步地，本公开提出了一种电磁加热设备，该电磁加热设备包括如上述实施例中的电磁加热设备的半桥驱动加热检锅电路。
根据本公开实施例的电磁加热设备，通过电磁加热设备能够实现上述实施例中电磁加热设备的半桥驱动加热检锅电路的功能，从而能够有效提高检锅可靠性，同时提高电磁加热设备的使用寿命。
图5是本公开实施例的电磁加热设备的检锅方法的流程图。
进一步地，本公开提出了一种电磁加热设备的检锅方法，如图5所示，本实施例的检锅方法包括以下步骤：S10，输出单脉冲检锅信号至电磁加热设备的半桥驱动模块，以通过半桥驱动模块驱动线圈盘进行谐振工作。S20，通过脉冲检测模块检测线圈盘的谐振电流，并根据线圈盘的谐振电流生成脉冲信号。S30，对脉冲信号进行计数，并根据脉冲信号的数量判断电磁加热设备上是否放置锅具。
具体地，参见图2和图5，控制模块100上设置有两个PWM引脚，分别为PWM1和PWM2，在该实施例中，控制模块100通过PWM2输出单脉冲检锅信号至电磁加热设备的半桥驱动模块200中，从而可以使半桥驱动模块200中的线圈盘204进行谐振工作。
更具体地，如图3所示，其中，W10表示PWM2输出的单脉冲检锅信号，W11则是线圈盘204的谐振信号，由图3可知，线圈盘204在单脉冲检锅信号的驱动下，能够与电容205和电容206发生LC谐振，从而产生谐振信号。由于内阻消耗的原因，其谐振信号将越来越弱，直至消失。
如图2可知，脉冲检测模块300与线圈盘204相连，在线圈盘204产生谐振信号的时候，脉冲检测模块300可以检测到线圈盘204的谐振电流，并根据线圈盘204生成脉冲信号，如图3中所示的W12信号则为脉冲检测模块300根据线圈盘204的谐振电流生成的脉冲信号。
可以理解的是，通过脉冲检测模块300能够检测到线圈盘204的谐振电流并生成与该 谐振电流相对应的脉冲信号，然后再利用与脉冲检测模块300相连的控制模块100对脉冲信号进行计数，在得到脉冲信号的数量之后，则根据脉冲信号的数量可以进一步判断电磁加热设备上是否放置有锅具。
在本公开的一些示例中，根据脉冲信号的数量判断电磁加热设备上是否放置锅具包括：判断脉冲信号的数量是否小于第一预设值；如果是，则确定电磁加热设备上放置锅具；如果否，则确定电磁加热设备上未放置锅具。
需要说明的是，本公开实施例的电磁加热设备的检锅方法的其他具体实施例方式可以参照上述实施例中的电磁加热设备的半桥驱动加热检锅电路的实施方法的具体实施例。
综上，通过上述实施例的电磁加热设备的检锅方法，在检锅时，控制器可以只对PWM2输出一个短脉冲，脉冲宽度约1微秒至10微秒，下桥开关管通过这个时间段从电源供电处获取能量，之后线圈盘和谐振电容发生谐振，通过过零电压比较单元303输出的脉冲数量获取谐振周期实现检测锅具。从而，检锅电路中的开关管只导通非常短的时间，且上桥开关管不导通，检锅时半桥驱动加热检锅电路的开关管损耗大幅降低，能够有效提高检锅可靠性，同时提高电磁加热设备的使用寿命。
进一步地，本公开提出了一种计算机可读存储介质，其上存储有电磁加热设备的检锅程序，该电磁加热设备的检锅程序被处理器执行时实现如上述实施例的电磁加热设备的检锅方法。
本公开实施例的计算机可读存储介质，处理器执行存储在该存储介质上的电磁加热设备的检锅程序，能够有效提高检锅可靠性，同时提高电磁加热设备的使用寿命。
进一步地，本公开提出了一种电磁加热设备，该电磁加热设备包括存储器、处理器及存储在存储器上并可在处理器上运行的电磁加热设备的检锅程序，处理器执行检锅程序时，实现如上述实施例的电磁加热设备的检锅方法。
根据本公开实施例的电磁加热设备，处理器执行存储在存储器上的电磁加热设备的检锅程序，能够有效提高检锅可靠性，同时提高电磁加热设备的使用寿命。
上面结合附图对本公开实施例作了详细说明，但是本公开不限于上述实施例，在所述技术领域普通技术人员所具备的知识范围内，还可以在不脱离本公开宗旨的前提下作出各种变化。

Claims (13)

  1. 一种电磁加热设备的半桥驱动加热检锅电路，其中，包括控制模块和脉冲检锅模块，其中，
    所述控制模块用于输出单脉冲检锅信号至所述电磁加热设备的半桥驱动模块，以通过所述半桥驱动模块驱动线圈盘进行谐振工作；
    所述脉冲检测模块与所述线圈盘相连，所述脉冲检测模块用于检测所述线圈盘的谐振电流，并根据所述线圈盘的谐振电流生成脉冲信号；
    所述控制模块与所述脉冲检测模块相连，所述控制模块还用于对所述脉冲信号进行计数，并根据所述脉冲信号的数量判断所述电磁加热设备上是否放置锅具。
  2. 如权利要求1所述的电磁加热设备的半桥驱动加热检锅电路，其中，所述脉冲检测模块包括：
    电流检测单元，所述电流检测单元与所述线圈盘相连，所述电流检测单元用于检测所述线圈盘的谐振电流以输出检锅电流信号；
    负载单元，所述负载单元与所述电流检测单元相连，所述负载单元用于根据所述检锅电流信号生成电压检测信号；
    过零电压比较单元，所述过零电压比较单元与所述负载单元相连，所述过零电压比较单元用于根据所述电压检测信号输出所述脉冲信号。
  3. 如权利要求2所述的电磁加热设备的半桥驱动加热检锅电路，其中，所述过零电压比较单元包括：
    限流电阻，所述限流电阻的一端与所述负载单元的一端相连；
    比较器，所述比较器的正输入端与所述限流电阻的另一端相连，所述比较器的负输入端与所述负载单元的另一端相连，所述比较器的输出端与所述控制模块相连；
    正向电压钳位二极管，所述正向电压钳位二极管的阳极与所述比较器的正输入端相连，所述正向电压钳位二极管的阴极与所述比较器的负输入端相连；
    反向电压钳位二极管，所述反向电压钳位二极管的阳极与所述比较器的负输入端相连，所述反向电压钳位二极管的阴极与所述比较器的正输入端相连。
  4. 如权利要求2所述的电磁加热设备的半桥驱动加热检锅电路，其中，所述半桥驱动模块包括上桥开关管和下桥开关管，所述电流检测单元包括电流互感器，所述电流互感器的初级线圈的一端连接到所述上桥开关管与所述下桥开关管之间的节点，所述电流互感器的初级线圈的另一端连接到所述线圈盘，所述电流互感器的次级线圈的两端连接到所述负载单元。
  5. 如权利要求4所述的电磁加热设备的半桥驱动加热检锅电路，其中，所述负载单元 包括：
    第一电阻，所述第一电阻的一端与所述电流互感器的次级线圈的一端相连，所述第一电阻的另一端与所述电流互感器的次级线圈的另一端相连；
    第二电阻，所述第二电阻的一端与所述第一电阻的一端相连；
    第一二极管，所述第一二极管的阳极与所述第一电阻的另一端相连，所述第一二极管的阴极与所述第二电阻的另一端相连；
    第二二极管，所述第二二极管的阳极与所述第二电阻的另一端相连，所述第二二极管的阴极与所述第一电阻的另一端相连。
  6. 如权利要求5所述的电磁加热设备的半桥驱动加热检锅电路，其中，所述第二电阻的阻值远小于所述第一电阻的阻值。
  7. 如权利要求4所述的电磁加热设备的半桥驱动加热检锅电路，其中，所述控制模块延时第一预设时间后输出所述单脉冲检锅信号至所述半桥驱动模块，以驱动所述上桥开关管或所述下桥开关管导通，所述线圈盘在所述上桥开关管或所述下桥开关管导通后开始谐振。
  8. 如权利要求1-7中任一项所述的电磁加热设备的半桥驱动加热检锅电路，其中，所述控制模块在所述脉冲信号的数量小于第一预设值时确定所述电磁加热设备上放置锅具。
  9. 一种电磁加热设备，其中，包括如权利要求1-8中任一项所述的电磁加热设备的半桥驱动加热检锅电路。
  10. 一种电磁加热设备的检锅方法，其中，包括：
    输出单脉冲检锅信号至所述电磁加热设备的半桥驱动模块，以通过所述半桥驱动模块驱动线圈盘进行谐振工作；
    通过脉冲检测模块检测所述线圈盘的谐振电流，并根据所述线圈盘的谐振电流生成脉冲信号；
    对所述脉冲信号进行计数，并根据所述脉冲信号的数量判断所述电磁加热设备上是否放置锅具。
  11. 如权利要求10所述的电磁加热设备的检锅方法，其中，根据所述脉冲信号的数量判断所述电磁加热设备上是否放置锅具，包括：
    判断所述脉冲信号的数量是否小于第一预设值；
    如果是，则确定所述电磁加热设备上放置锅具；
    如果否，则确定所述电磁加热设备上未放置锅具。
  12. 一种计算机可读存储介质，其中，其上存储有电磁加热设备的检锅程序，该电磁加热设备的检锅程序被处理器执行时实现如权利要求10或11所述的电磁加热设备的检锅 方法。
  13. 一种电磁加热设备，其中，包括存储器、处理器及存储在存储器上并可在处理器上运行的电磁加热设备的检锅程序，所述处理器执行所述检锅程序时，实现如权利要求10或11所述的电磁加热设备的检锅方法。
PCT/CN2021/139560 2020-12-29 2021-12-20 半桥驱动加热检锅电路、加热设备、检锅方法、存储介质 WO2022143248A1 (zh)

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