阅读说明：本技术 电磁加热烹饪器具控制方法、装置及电磁加热烹饪器具 (Electromagnetic heating cooking utensil control method and device and electromagnetic heating cooking utensil ) 是由 陈和辉 卜韩萍 张博超 刘畅 于 2021-09-07 设计创作，主要内容包括：本发明提供了电磁加热烹饪器具控制方法、装置及电磁加热烹饪器具,其中,该方法包括：监控驱动IGBT导通的触发信号；在当前市电半波周期接收到驱动IGBT导通的触发信号时,获取IGBT的当前CE极电压,控制IGBT按照上一市电半波周期确定的第一开启延时导通；判断当前CE极电压是否小于上一市电半波周期对应的上一CE极电压；如果小于,增加第一开启延时,直至当前CE极电压不小于上一市电半波周期对应的最小CE极电压；在之后每个市电半波周期接收到驱动IGBT导通的触发信号后,按照最后更新的第一开启延时控制IGBT导通。通过判断IGBT在开通前CE极电压的大小来补充开启延时,以减小开通损耗。(The invention provides a control method and a control device for an electromagnetic heating cooking appliance and the electromagnetic heating cooking appliance, wherein the method comprises the following steps: monitoring a trigger signal for driving the IGBT to be conducted; when a trigger signal for driving the IGBT to be conducted is received in the current mains supply half-wave period, obtaining the current CE electrode voltage of the IGBT, and controlling the IGBT to be conducted according to the first starting delay determined by the last mains supply half-wave period; judging whether the current CE voltage is smaller than the last CE voltage corresponding to the last commercial power half-wave period or not; if the current CE voltage is less than the minimum CE voltage corresponding to the last half-wave period of the mains supply, increasing the first starting delay until the current CE voltage is not less than the minimum CE voltage corresponding to the last half-wave period of the mains supply; and after receiving a trigger signal for driving the IGBT to be conducted in each half-wave period of the mains supply, controlling the IGBT to be conducted according to the latest updated first starting delay. The opening time delay is supplemented by judging the voltage of the CE electrode before the opening of the IGBT so as to reduce the opening loss.)

1. An electromagnetic heating cooking appliance control method, the electromagnetic heating cooking appliance comprising: the IGBT driving circuit comprises an LC parallel resonance circuit and an IGBT, wherein one end of the LC parallel resonance circuit is connected with a collector of the IGBT, and the LC parallel resonance circuit is used for generating a trigger signal for driving the IGBT to be conducted, and the method comprises the following steps:

monitoring the trigger signal for driving the IGBT to be conducted;

when a trigger signal for driving the IGBT to be conducted is received in the current mains supply half-wave period, obtaining the current CE electrode voltage of the IGBT, and controlling the IGBT to be conducted according to the first starting delay determined by the last mains supply half-wave period;

judging whether the current CE voltage is smaller than a last CE voltage corresponding to a last mains supply half-wave period;

when the current CE voltage is smaller than the last CE voltage corresponding to the last mains supply half-wave period, increasing the first starting delay, and returning to the step of monitoring the trigger signal for driving the IGBT to be conducted until the current CE voltage is not smaller than the last CE voltage corresponding to the last mains supply half-wave period;

and determining the first starting delay corresponding to the previous mains supply half-wave period as a standard starting delay, and controlling the IGBT to be conducted according to the standard starting delay after each mains supply half-wave period receives a trigger signal for driving the IGBT to be conducted.

2. The method of claim 1, wherein prior to obtaining the current CE voltage of the IGBT, the method further comprises:

judging whether the current power supply voltage of the electromagnetic heating cooking appliance is the voltage peak value in the current mains supply half-wave period;

and when the current power supply voltage of the electromagnetic heating cooking utensil is the voltage peak value in the current mains supply half-wave period, acquiring the current CE voltage of the IGBT.

3. The method of claim 2,

and when the current power supply voltage of the electromagnetic heating cooking appliance is not the voltage peak value in the current mains supply half-wave period, controlling the IGBT to be conducted according to the first starting delay determined by the last mains supply half-wave period, and returning to the step of monitoring the trigger signal for driving the IGBT to be conducted.

4. The method according to claim 1, wherein the initial value of the first turn-on delay is 0 when the induction heating cooking appliance is first powered on.

5. An electromagnetic heating cooking appliance control apparatus, the electromagnetic heating cooking appliance comprising: LC parallel resonance circuit and IGBT, LC parallel resonance circuit's one end with the collector of IGBT is connected, LC parallel resonance circuit is used for generating the trigger signal that drives IGBT and switches on, its characterized in that, the device includes:

the monitoring module is used for monitoring the trigger signal for driving the IGBT to be conducted;

the control module is used for acquiring the current CE electrode voltage of the IGBT and controlling the IGBT to be switched on according to the first starting delay determined by the last mains supply half-wave period when the trigger signal for driving the IGBT to be switched on is received by the current mains supply half-wave period;

the judging module is used for judging whether the current CE voltage is smaller than the last CE voltage corresponding to the last commercial power half-wave period;

the first processing module is used for increasing the first starting delay when the current CE voltage is smaller than the last CE voltage corresponding to the last mains supply half-wave period, and returning to the monitoring module until the current CE voltage is not smaller than the last CE voltage corresponding to the last mains supply half-wave period;

and the second processing module is used for determining the first starting delay corresponding to the previous mains supply half-wave period as a standard starting delay, and controlling the IGBT to be conducted according to the standard starting delay after each mains supply half-wave period receives a trigger signal for driving the IGBT to be conducted.

6. An electromagnetic heating cooking appliance, comprising: LC parallel resonance circuit and IGBT, LC parallel resonance circuit's one end with the collector of IGBT is connected, LC parallel resonance circuit is used for generating the trigger signal that drives IGBT and switches on, its characterized in that, electromagnetic heating cooking utensil still includes: the input end of the controller is connected with the LC parallel resonance circuit, and the output end of the controller is connected with the base electrode of the IGBT;

the controller includes: a memory and a processor communicatively coupled to each other, the memory having stored therein computer instructions, the processor executing the computer instructions to perform the method of any of claims 1-4.

7. The electromagnetic heating cooking appliance of claim 6, wherein the LC parallel resonant circuit comprises: the IGBT driving circuit comprises a resonant capacitor and a coil panel which are connected in parallel, wherein a first common end of the resonant capacitor and the coil panel is connected with a collector of the IGBT, a base of the IGBT is connected with a first output end of the controller, and an emitter of the IGBT is grounded.

8. The electromagnetic heating cooking appliance of claim 7, wherein the LC parallel resonant circuit further comprises: a synchronization circuit and a comparison circuit, wherein,

a first input end of the synchronous circuit is connected with the first common end, a second input end of the synchronous circuit is connected with a power supply of the electromagnetic heating cooking appliance, a first output end of the synchronous circuit is connected with a first input end of the comparison circuit, and a second output end of the synchronous circuit is connected with a second input end of the comparison circuit, and the synchronous circuit is used for detecting the voltages of the resonant capacitor and the coil panel and the power supply voltage of the electromagnetic heating cooking appliance and respectively inputting the voltages of the resonant capacitor and the coil panel and the power supply voltage of the electromagnetic heating cooking appliance into two input ends of the comparison circuit;

the output end of the comparison circuit is connected with the first input end of the controller and used for generating a trigger signal for driving the IGBT to be conducted according to the resonant capacitor, the voltage of the coil panel and the power supply voltage of the electromagnetic heating cooking appliance and sending the trigger signal for driving the IGBT to be conducted to the controller.

9. The electromagnetic heating cooking appliance of claim 7, further comprising: and the voltage detection circuit is used for detecting the CE electrode voltage of the IGBT, the input end of the voltage detection circuit is connected with the first public end, the output end of the voltage detection circuit is connected with the second input end of the controller, and the voltage detection circuit is used for collecting the current CE electrode voltage of the IGBT and sending the current CE electrode voltage of the IGBT to the controller.

10. A computer-readable storage medium having stored thereon computer instructions for causing a computer to thereby perform the method of any one of claims 1-4.

Technical Field

The invention relates to the technical field of household appliances, in particular to a control method and device of an electromagnetic heating cooking appliance and the electromagnetic heating cooking appliance.

Background

At present, the IGBT has become a control mode for many household appliances, such as electromagnetic heating cooking appliances like induction cookers and IH rice cookers. The power circuit of the induction cooker and the IH electric cooker in the market at present is mainly a single-tube LC parallel resonance scheme, and the control mode is that after a control chip receives a signal for triggering a comparator to turn over by a synchronous circuit, an IGBT is controlled to be immediately started. When the CE voltage at the moment of opening the IGBT is the lowest voltage which can be reached by resonance, the opening power consumption is lowest, but for different electromagnetic heating cooking appliances, the CE voltage at the moment of opening the IGBT is often not at the lowest voltage in practical application, so that larger opening loss of the IGBT is caused.

Disclosure of Invention

In view of this, embodiments of the present invention provide a method and an apparatus for controlling an electromagnetic heating cooking appliance, and an electromagnetic heating cooking appliance, so as to overcome the problem of large IGBT turn-on loss in the control mode of the electromagnetic heating cooking appliance in the prior art.

According to a first aspect, an embodiment of the present invention provides an electromagnetic heating cooking appliance control method, including: the IGBT driving circuit comprises an LC parallel resonance circuit and an IGBT, wherein one end of the LC parallel resonance circuit is connected with a collector of the IGBT, the LC parallel resonance circuit is used for generating a trigger signal for driving the IGBT to be conducted, and the method comprises the following steps:

monitoring the trigger signal for driving the IGBT to be conducted;

when a trigger signal for driving the IGBT to be conducted is received in the current mains supply half-wave period, obtaining the current CE electrode voltage of the IGBT, and controlling the IGBT to be conducted according to the first starting delay determined by the last mains supply half-wave period;

judging whether the current CE voltage is smaller than a last CE voltage corresponding to a last mains supply half-wave period;

when the current CE voltage is smaller than the last CE voltage corresponding to the last mains supply half-wave period, increasing the first starting delay, and returning to the step of monitoring the trigger signal for driving the IGBT to be conducted until the current CE voltage is not smaller than the last CE voltage corresponding to the last mains supply half-wave period;

and determining the first starting delay corresponding to the previous mains supply half-wave period as a standard starting delay, and controlling the IGBT to be conducted according to the standard starting delay after each mains supply half-wave period receives a trigger signal for driving the IGBT to be conducted.

Optionally, before obtaining the current CE voltage of the IGBT, the method further includes:

judging whether the current power supply voltage of the electromagnetic heating cooking appliance is the voltage peak value in the current mains supply half-wave period;

and when the current power supply voltage of the electromagnetic heating cooking utensil is the voltage peak value in the current mains supply half-wave period, acquiring the current CE voltage of the IGBT.

Optionally, when the current power voltage of the electromagnetic heating cooking appliance is not the voltage peak value in the current mains supply half-wave period, controlling the IGBT to turn on according to a first turn-on delay determined by the previous mains supply half-wave period, and returning to the step of monitoring the trigger signal for driving the IGBT to turn on.

Optionally, when the electromagnetic heating cooking appliance is powered on for the first time, the initial value of the first turn-on delay time is 0.

According to a second aspect, an embodiment of the present invention provides an electromagnetic heating cooking appliance control apparatus, including: LC parallel resonance circuit and IGBT, LC parallel resonance circuit's one end is connected with the collector of IGBT, LC parallel resonance circuit is used for generating the trigger signal that drives IGBT and switches on, the device includes:

the monitoring module is used for monitoring the trigger signal for driving the IGBT to be conducted;

the control module is used for acquiring the current CE electrode voltage of the IGBT and controlling the IGBT to be switched on according to the first starting delay determined by the previous mains supply half-wave period when the current mains supply half-wave period receives a trigger signal for driving the IGBT to be switched on;

the judging module is used for judging whether the current CE voltage is smaller than the last CE voltage corresponding to the last commercial power half-wave period;

the first processing module is used for increasing the first starting delay when the current CE voltage is smaller than the last CE voltage corresponding to the last mains supply half-wave period, and returning to the monitoring module until the current CE voltage is not smaller than the last CE voltage corresponding to the last mains supply half-wave period;

and the second processing module is used for determining the first starting delay corresponding to the previous mains supply half-wave period as a standard starting delay, and controlling the IGBT to be conducted according to the standard starting delay after each mains supply half-wave period receives a trigger signal for driving the IGBT to be conducted.

According to a third aspect, embodiments of the present invention provide an electromagnetic heating cooking appliance, including: LC parallel resonance circuit and IGBT, LC parallel resonance circuit's one end is connected with the collector electrode of IGBT, LC parallel resonance circuit is used for generating the trigger signal that drives IGBT and switches on, electromagnetic heating cooking utensil still includes: the input end of the controller is connected with the LC parallel resonance circuit, and the output end of the controller is connected with the base electrode of the IGBT;

the controller includes: a memory and a processor, the memory and the processor being communicatively connected to each other, the memory having stored therein computer instructions, the processor being configured to execute the computer instructions to perform the method according to the first aspect and any one of the optional embodiments thereof.

Optionally, the LC parallel resonant circuit comprises: the IGBT driving circuit comprises a resonant capacitor and a coil panel which are connected in parallel, wherein a first common end of the resonant capacitor and the coil panel is connected with a collector of the IGBT, a base of the IGBT is connected with a first output end of the controller, and an emitter of the IGBT is grounded.

Optionally, the LC parallel resonant circuit further comprises: a synchronization circuit and a comparison circuit, wherein,

a first input end of the synchronous circuit is connected with the first common end, a second input end of the synchronous circuit is connected with a power supply of the electromagnetic heating cooking appliance, a first output end of the synchronous circuit is connected with a first input end of the comparison circuit, and a second output end of the synchronous circuit is connected with a second input end of the comparison circuit, and the synchronous circuit is used for detecting the voltages of the resonant capacitor and the coil panel and the power supply voltage of the electromagnetic heating cooking appliance and respectively inputting the voltages of the resonant capacitor and the coil panel and the power supply voltage of the electromagnetic heating cooking appliance into two input ends of the comparison circuit;

the output end of the comparison circuit is connected with the first input end of the controller and used for generating a trigger signal for driving the IGBT to be conducted according to the resonant capacitor, the voltage of the coil panel and the power supply voltage of the electromagnetic heating cooking appliance and sending the trigger signal for driving the IGBT to be conducted to the controller.

Optionally, the electromagnetic heating cooking appliance further includes: and the voltage detection circuit is used for detecting the CE electrode voltage of the IGBT, the input end of the voltage detection circuit is connected with the first public end, the output end of the voltage detection circuit is connected with the second input end of the controller, and the voltage detection circuit is used for collecting the current CE electrode voltage of the IGBT and sending the current CE electrode voltage of the IGBT to the controller.

According to a fourth aspect, an embodiment of the present invention provides a computer-readable storage medium storing computer instructions for causing a computer to perform the method of the first aspect, or any one of the optional implementation manners of the first aspect.

The technical scheme of the invention has the following advantages:

according to the control method of the electromagnetic heating cooking utensil provided by the embodiment of the invention, the trigger signal for driving the IGBT to be conducted is monitored; when a trigger signal for driving the IGBT to be conducted is received in the current mains supply half-wave period, obtaining the current CE electrode voltage of the IGBT, and controlling the IGBT to be conducted according to the first starting delay determined by the last mains supply half-wave period; judging whether the current CE voltage is smaller than the last CE voltage corresponding to the last commercial power half-wave period or not; when the current CE voltage is smaller than the last CE voltage corresponding to the last mains supply half-wave period, increasing a first opening delay, and returning to the step of monitoring the trigger signal for driving the IGBT to be conducted until the current CE voltage is not smaller than the minimum CE voltage corresponding to the last mains supply half-wave period; and determining a first starting time delay corresponding to the previous mains supply half-wave period as a standard starting time delay, and controlling the IGBT to be conducted according to the standard starting time delay after each mains supply half-wave period receives a trigger signal for driving the IGBT to be conducted. Therefore, the opening time delay of the IGBT is supplemented by judging the voltage of the CE electrode before the opening of the IGBT, so that the voltage of the CE electrode at the opening moment of the IGBT is reduced to the minimum to reduce the opening loss of the IGBT.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.

Fig. 1 is a schematic structural view of an electromagnetic heating cooking appliance according to an embodiment of the present invention;

fig. 2 is a flowchart of a control method of an electromagnetic heating cooking appliance according to an embodiment of the present invention;

fig. 3 is a schematic diagram of a specific control process of an electromagnetic heating cooking appliance according to an embodiment of the invention;

fig. 4 is a schematic structural diagram of a control device of an electromagnetic heating cooking appliance according to an embodiment of the invention;

fig. 5 is a schematic structural diagram of a controller in an electromagnetic heating cooking appliance according to an embodiment of the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The technical features mentioned in the different embodiments of the invention described below can be combined with each other as long as they do not conflict with each other.

At present, the IGBT has become a control mode for many household appliances, such as electromagnetic heating cooking appliances like induction cookers and IH rice cookers. The power circuit of the induction cooker and the IH electric cooker in the market at present is mainly a single-tube LC parallel resonance scheme, and the control mode is that after a control chip receives a signal for triggering a comparator to turn over by a synchronous circuit, an IGBT is controlled to be immediately started. When the CE voltage at the moment of opening the IGBT is the lowest voltage which can be reached by resonance, the opening power consumption is lowest, but for different electromagnetic heating cooking appliances, the CE voltage at the moment of opening the IGBT is often not at the lowest voltage in practical application, so that larger opening loss of the IGBT is caused.

In view of the above problem, an embodiment of the present invention provides a method for controlling an electromagnetic heating cooking appliance, as shown in fig. 1, including: as shown in fig. 1, the electromagnetic heating cooking utensil further comprises a controller 2, wherein an input end of the controller 2 is connected with the LC parallel resonance circuit 1, and an output end of the controller 2 is connected with a base electrode of the IGBT and used for controlling the IGBT to be conducted according to the trigger signal.

Specifically, the LC parallel resonant circuit 1 described above includes: and the first common end of the resonance capacitor and the coil panel is connected with the collector of the IGBT, the base of the IGBT is connected with the first output end of the controller 2, and the emitter is grounded.

Specifically, the LC parallel resonant circuit 1 described above further includes: the first input end of the synchronous circuit is connected with the first common end, the second input end of the synchronous circuit is connected with a power supply of the electromagnetic heating cooking appliance, the first output end of the synchronous circuit is connected with the first input end of the comparison circuit, the second output end of the synchronous circuit is connected with the second input end of the comparison circuit, and the synchronous circuit and the comparison circuit are used for detecting the voltage of the resonant capacitor and the coil panel and the power supply voltage of the electromagnetic heating cooking appliance and respectively inputting the voltage of the resonant capacitor and the coil panel and the power supply voltage of the electromagnetic heating cooking appliance into the two input ends of the comparison circuit; the output end of the comparison circuit is connected with the first input end of the controller 2, and is used for generating a trigger signal for driving the IGBT to be conducted according to the voltage of the resonance capacitor and the coil panel and the power supply voltage of the electromagnetic heating cooking appliance, and sending the trigger signal for driving the IGBT to be conducted to the controller 2. The circuit structure and the implementation principle of the LC parallel resonant circuit 1 are the prior art, and reference may be made to the description of the related circuit structure and the working principle in the prior art, which is not described herein again, and in addition, the LC parallel resonant circuit 1 may also be in other circuit structure forms of the same principle in the prior art, which is not limited by the present invention.

Specifically, in an embodiment, as shown in fig. 1, the electromagnetic heating cooking apparatus further includes: and the input end of the voltage detection circuit 3 is connected with the resonant capacitor and the first common end of the coil panel (the collector electrode of the IGBT), and the output end of the voltage detection circuit 3 is connected with the second input end of the controller 2, so that the current CE electrode voltage of the IGBT can be acquired, and the current CE electrode voltage of the IGBT can be transmitted to the controller 2. Specifically, the voltage detection circuit may be a circuit that implements a voltage sampling function or a device with a voltage detection function in the prior art, and the invention is not limited thereto.

The control method of the electromagnetic heating cooking appliance is applied to the controller 2 shown in fig. 1, and specifically comprises the following steps as shown in fig. 2:

step S101: and monitoring a trigger signal for driving the IGBT to be conducted.

Specifically, the trigger signal is generated by the synchronous circuit trigger comparator in the LC parallel resonant circuit 1, and the specific generation process and principle of the trigger signal refer to the description of the related contents in the prior art, which is not described herein again.

Step S102: and when receiving a trigger signal for driving the IGBT to be conducted in the current mains supply half-wave period, acquiring the current CE electrode voltage of the IGBT, and controlling the IGBT to be conducted according to the first starting delay determined by the last mains supply half-wave period.

Specifically, when the electromagnetic heating cooking appliance is powered on for the first time, the initial value of the first turn-on delay time is 0. The current CE voltage may be sampled by the voltage detection circuit described above. In practical application, the controller 2 generates a voltage acquisition command when receiving the trigger signal, and sends the voltage acquisition command to the voltage detection circuit to acquire the CE voltage of the IGBT.

Step S103: and judging whether the current CE voltage is smaller than the last CE voltage corresponding to the last half-wave period of the mains supply.

Specifically, after the LC parallel resonant circuit generates the trigger signal in each half-wave period of the utility power, the magnitude of the CE voltage before the IGBT is turned on is monitored, so that the turn-on power consumption of the IGBT is reflected, if the CE voltage before the IGBT is turned on is larger, the corresponding turn-on power consumption is larger, and otherwise, if the CE voltage is smaller, the turn-on power consumption is smaller.

Step S104: and when the current CE voltage is smaller than the last CE voltage corresponding to the last mains supply half-wave period, increasing a first opening delay, and returning to the step S101 until the current CE voltage is not smaller than the last CE voltage corresponding to the last mains supply half-wave period.

Specifically, the opening delay corresponding to the minimum CE voltage before the IGBT is switched on is determined by continuously increasing the opening delay of the IGBT and comparing the CE voltage of the IGBT before the IGBT is switched on every time.

Step S105: and determining a first starting time delay corresponding to the previous mains supply half-wave period as a standard starting time delay, and controlling the IGBT to be conducted according to the standard starting time delay after each mains supply half-wave period receives a trigger signal for driving the IGBT to be conducted.

Specifically, since the CE electrode voltage before the IGBT corresponding to the finally updated first turn-on delay is turned on is the smallest, that is, the turn-on power consumption of the IGBT is the lowest, after a trigger signal for driving the IGBT to be turned on is received in each half-wave period of the commercial power, the turn-on delay is used to control the IGBT to be turned on, and it can be ensured that the IGBT is always in a lower turn-on loss.

By executing the steps, the method for controlling the electromagnetic heating cooking utensil provided by the embodiment of the invention supplements the opening delay of the IGBT by judging the voltage of the CE electrode before the opening of the IGBT, so that the voltage of the CE electrode at the opening moment of the IGBT is reduced to the minimum to reduce the opening loss of the IGBT.

Specifically, in an embodiment, before acquiring the current CE voltage of the IGBT in step S102, the method further includes the following steps:

step S201: and judging whether the current power supply voltage of the electromagnetic heating cooking appliance is the voltage peak value in the current mains supply half-wave period.

Step S202: and when the current power supply voltage of the electromagnetic heating cooking appliance is the voltage peak value in the current mains supply half-wave period, acquiring the current CE voltage of the IGBT.

Step S203: and when the current power supply voltage of the electromagnetic heating cooking appliance is not the voltage peak value in the current mains supply half-wave period, controlling the IGBT to be conducted according to the first starting delay determined by the last mains supply half-wave period, and returning to the step of monitoring the trigger signal for driving the IGBT to be conducted.

Specifically, when the CE voltage of the IGBT is reduced to about the power supply voltage, the synchronization circuit triggers the comparison circuit to flip over to output the trigger signal, so that when the current power supply voltage is the voltage peak value in the current mains supply half-wave period, the acquired CE voltage is more accurate, and voltage acquisition is performed at the moment when the current power supply voltage is the voltage peak value in the current mains supply half-wave period each time, so as to ensure the accuracy of the CE voltage comparison result in different mains supply half-wave periods, so that the accuracy of finally determining the optimal turn-on delay time can be further improved, and the IGBT turn-on loss can be reduced.

The following describes the control method of the electromagnetic heating cooking appliance according to the embodiment of the present invention in detail with reference to specific application examples.

First, the electromagnetic heating cooking appliance of the present invention may be an induction cooker or an IH rice cooker, and is a cooking appliance having a single or a plurality of single-tube LC parallel resonance circuits. In an LC parallel resonance circuit, a resonance capacitor is connected in parallel with a coil disk, one common terminal thereof is connected to the C-pole of an IGBT, and a synchronous circuit and a comparator capable of detecting the voltage across the coil disk and the resonance capacitor are provided. In the resonance process of the coil panel and the resonance capacitor, when the voltage of the IGBT CE electrode is reduced to about the power voltage, the synchronous circuit triggers the comparator to turn over; the controller can turn on the IGBT after receiving the signal turned by the comparator; before the IGBT is turned on, as shown in fig. 3, if the power supply voltage is the voltage peak value in the present half-wave of the utility power, the voltage U of the CE pole of the IGBT at that time is read by the sampling circuit, and the U at that time is taken as the minimum value Umin; adjusting the starting delay time T of the IGBT of the next mains supply half-wave, wherein T is the sum of the current IGBT starting delay time and delta T; reading the CE electrode voltage U before the IGBT is started again at the half-wave peak value of the mains supply, and comparing the CE electrode voltage U with the voltage U min; if U is less than Umin, the current IGBT starting delay time T is lower than the IGBT CE pole back pressure of the last starting delay time T-delta T, but the IGBT starting delay time T is not necessarily the IGBT starting delay time which enables the IGBT CE pole back pressure to be the lowest, the two steps are repeated until U is more than or equal to Umin, if U is Umin, the current IGBT starting delay time T and the last starting delay time T-delta T can enable the IGBT CE pole back pressure to be the lowest, and the last IGBT starting delay time is used as the IGBT starting delay time of all the follow-up commercial power half waves; and if U is more than Umin, the last opening delay T-delta T can enable the electrode back pressure of the IGBT CE to be the lowest, and the last IGBT opening delay is used as the IGBT opening delay of all subsequent commercial power half-waves. Therefore, CE electrode voltage of the corresponding IGBT is the lowest when the IGBTs of all the following mains supply half waves are started, and further the starting power consumption is reduced.

By executing the steps, the method for controlling the electromagnetic heating cooking utensil provided by the embodiment of the invention supplements the opening delay of the IGBT by judging the voltage of the CE electrode before the opening of the IGBT, so that the voltage of the CE electrode at the opening moment of the IGBT is reduced to the minimum to reduce the opening loss of the IGBT.

An embodiment of the present invention further provides an electromagnetic heating cooking appliance control device, which is applied to the controller 2 of the electromagnetic heating cooking appliance shown in fig. 1, and as shown in fig. 4, the electromagnetic heating cooking appliance control device includes:

and the monitoring module 101 is used for monitoring a trigger signal for driving the IGBT to be conducted. For details, refer to the related description of step S101 in the above method embodiment, and no further description is provided here.

The control module 102 obtains a current CE electrode voltage of the IGBT when receiving a trigger signal for driving the IGBT to turn on in a current mains supply half-wave period, and controls the IGBT to turn on in a first turn-on delay determined according to a previous mains supply half-wave period. For details, refer to the related description of step S102 in the above method embodiment, and no further description is provided here.

And the judging module 103 is configured to judge whether the current CE voltage is smaller than a last CE voltage corresponding to a last half-wave period of the mains supply. For details, refer to the related description of step S103 in the above method embodiment, and no further description is provided here.

The first processing module 104 is configured to increase a first start delay when the current CE voltage is less than a previous CE voltage corresponding to a previous half-wave period of the mains supply, and return to the monitoring module until the current CE voltage is not less than the previous CE voltage corresponding to the previous half-wave period of the mains supply. For details, refer to the related description of step S104 in the above method embodiment, and no further description is provided here.

And the second processing module 105 is configured to determine a first turn-on delay corresponding to a previous half-wave period of the mains supply as a standard turn-on delay, and control the IGBT to be turned on according to the standard turn-on delay after each half-wave period of the mains supply receives a trigger signal for driving the IGBT to be turned on. For details, refer to the related description of step S105 in the above method embodiment, and no further description is provided here.

The electromagnetic heating cooking appliance control device provided by the embodiment of the invention is used for executing the electromagnetic heating cooking appliance control method provided by the embodiment, the implementation manner and the principle are the same, and the detailed content refers to the relevant description of the method embodiment and is not repeated.

Through the cooperative cooperation of the components, the control device of the electromagnetic heating cooking utensil provided by the embodiment of the invention supplements the opening delay of the IGBT by judging the voltage of the CE electrode before the opening of the IGBT, so that the voltage of the CE electrode at the opening moment of the IGBT is reduced to the minimum to reduce the opening loss of the IGBT.

Specifically, as shown in fig. 5, the controller 2 shown in fig. 1 specifically includes: a processor 901 and a memory 902, wherein the processor 901 and the memory 902 may be connected by a bus or other means, and fig. 5 illustrates an example of a connection by a bus.

Processor 901 may be a Central Processing Unit (CPU). The Processor 901 may also be other general purpose processors, Digital Signal Processors (DSPs), Application Specific Integrated Circuits (ASICs), Field Programmable Gate Arrays (FPGAs) or other Programmable logic devices, discrete Gate or transistor logic devices, discrete hardware components, or combinations thereof.

The memory 902, which is a non-transitory computer-readable storage medium, may be used to store non-transitory software programs, non-transitory computer-executable programs, and modules, such as program instructions/modules corresponding to the methods in the above-described method embodiments. The processor 901 executes various functional applications and data processing of the processor by executing non-transitory software programs, instructions and modules stored in the memory 902, that is, implements the methods in the above-described method embodiments.

The memory 902 may include a program storage area and a data storage area, wherein the program storage area may store an operating system, an application program required for at least one function; the storage data area may store data created by the processor 901, and the like. Further, the memory 902 may include high speed random access memory, and may also include non-transitory memory, such as at least one magnetic disk storage device, flash memory device, or other non-transitory solid state storage device. In some embodiments, the memory 902 may optionally include memory located remotely from the processor 901, which may be connected to the processor 901 via a network. Examples of such networks include, but are not limited to, the internet, intranets, local area networks, mobile communication networks, and combinations thereof.

One or more modules are stored in the memory 902, which when executed by the processor 901 performs the methods in the above-described method embodiments.

The specific details of the control device for the electromagnetic heating cooking appliance may be understood by referring to the corresponding related descriptions and effects in the above embodiments, and are not described herein again.

It will be understood by those skilled in the art that all or part of the processes of the methods of the embodiments described above can be implemented by a computer program, and the implemented program can be stored in a computer-readable storage medium, and when executed, can include the processes of the embodiments of the methods described above. The storage medium may be a magnetic Disk, an optical Disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a Flash Memory (Flash Memory), a Hard Disk (Hard Disk Drive, abbreviated as HDD) or a Solid State Drive (SSD), etc.; the storage medium may also comprise a combination of memories of the kind described above.

Although the embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the invention, and such modifications and variations fall within the scope defined by the appended claims.